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arch/x86/Kconfig 94.1 KB
b24413180   Greg Kroah-Hartman   License cleanup: ...
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  # SPDX-License-Identifier: GPL-2.0
daa93fab8   Sam Ravnborg   x86: enable "make...
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  # Select 32 or 64 bit
  config 64BIT
104daea14   Masahiro Yamada   kconfig: referenc...
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  	bool "64-bit kernel" if "$(ARCH)" = "x86"
  	default "$(ARCH)" != "i386"
a7f7f6248   Masahiro Yamada   treewide: replace...
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  	help
daa93fab8   Sam Ravnborg   x86: enable "make...
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  	  Say yes to build a 64-bit kernel - formerly known as x86_64
  	  Say no to build a 32-bit kernel - formerly known as i386
  
  config X86_32
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
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  	def_bool y
  	depends on !64BIT
341c787e3   Ingo Molnar   x86/kconfig: Move...
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  	# Options that are inherently 32-bit kernel only:
  	select ARCH_WANT_IPC_PARSE_VERSION
  	select CLKSRC_I8253
  	select CLONE_BACKWARDS
117ed4548   Thomas Gleixner   x86/irq/64: Remov...
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  	select HAVE_DEBUG_STACKOVERFLOW
341c787e3   Ingo Molnar   x86/kconfig: Move...
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  	select MODULES_USE_ELF_REL
  	select OLD_SIGACTION
7ac870747   Vincenzo Frascino   x86/vdso: Switch ...
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  	select GENERIC_VDSO_32
797335659   Brian Gerst   fanotify: Fix sys...
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  	select ARCH_SPLIT_ARG64
daa93fab8   Sam Ravnborg   x86: enable "make...
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  config X86_64
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
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  	def_bool y
  	depends on 64BIT
d94e06857   Ingo Molnar   x86/kconfig: Move...
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  	# Options that are inherently 64-bit kernel only:
4eb0716e8   Alexandre Ghiti   hugetlb: allow to...
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  	select ARCH_HAS_GIGANTIC_PAGE
c12d3362a   Ard Biesheuvel   int128: move __ui...
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  	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
d94e06857   Ingo Molnar   x86/kconfig: Move...
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  	select ARCH_USE_CMPXCHG_LOCKREF
  	select HAVE_ARCH_SOFT_DIRTY
  	select MODULES_USE_ELF_RELA
f616ab59c   Christoph Hellwig   dma-mapping: move...
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  	select NEED_DMA_MAP_STATE
09230cbc1   Christoph Hellwig   swiotlb: move the...
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  	select SWIOTLB
1032c0ba9   Sam Ravnborg   x86: arch/x86/Kco...
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518049d9d   Steven Rostedt (VMware)   ftrace/x86_32: Re...
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  config FORCE_DYNAMIC_FTRACE
  	def_bool y
  	depends on X86_32
  	depends on FUNCTION_TRACER
  	select DYNAMIC_FTRACE
  	help
  	 We keep the static function tracing (!DYNAMIC_FTRACE) around
  	 in order to test the non static function tracing in the
  	 generic code, as other architectures still use it. But we
  	 only need to keep it around for x86_64. No need to keep it
  	 for x86_32. For x86_32, force DYNAMIC_FTRACE. 
d94e06857   Ingo Molnar   x86/kconfig: Move...
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  #
  # Arch settings
  #
  # ( Note that options that are marked 'if X86_64' could in principle be
  #   ported to 32-bit as well. )
  #
8d5fffb92   Sam Ravnborg   x86: move all sim...
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  config X86
3c2362e62   Harvey Harrison   x86: use def_bool...
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  	def_bool y
c763ea265   Ingo Molnar   x86/kconfig: Sort...
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  	#
  	# Note: keep this list sorted alphabetically
  	#
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select ACPI_LEGACY_TABLES_LOOKUP	if ACPI
  	select ACPI_SYSTEM_POWER_STATES_SUPPORT	if ACPI
942fa985e   Yury Norov   32-bit userspace ...
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  	select ARCH_32BIT_OFF_T			if X86_32
2a21ad571   Thomas Gleixner   x86/time: Impleme...
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  	select ARCH_CLOCKSOURCE_INIT
c763ea265   Ingo Molnar   x86/kconfig: Sort...
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  	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI
fa5b6ec9e   Laura Abbott   lib/Kconfig.debug...
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  	select ARCH_HAS_DEBUG_VIRTUAL
399145f9e   Anshuman Khandual   mm/debug: add tes...
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  	select ARCH_HAS_DEBUG_VM_PGTABLE	if !X86_PAE
21266be9e   Dan Williams   arch: consolidate...
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  	select ARCH_HAS_DEVMEM_IS_ALLOWED
b1a57bbfc   Douglas Anderson   kgdb: Delay "kgdb...
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  	select ARCH_HAS_EARLY_DEBUG		if KGDB
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select ARCH_HAS_ELF_RANDOMIZE
72d931046   Linus Torvalds   Make ARCH_HAS_FAS...
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  	select ARCH_HAS_FAST_MULTIPLIER
316d097c4   Dave Hansen   x86/pti: Filter a...
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  	select ARCH_HAS_FILTER_PGPROT
6974f0c45   Daniel Micay   include/linux/str...
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  	select ARCH_HAS_FORTIFY_SOURCE
957e3facd   Riku Voipio   gcov: enable GCOV...
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  	select ARCH_HAS_GCOV_PROFILE_ALL
0f1441b44   Peter Zijlstra   objtool: Fix noin...
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  	select ARCH_HAS_KCOV			if X86_64 && STACK_VALIDATION
0c9c1d563   Thiago Jung Bauermann   x86, s390: Move A...
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  	select ARCH_HAS_MEM_ENCRYPT
10bcc80e9   Mathieu Desnoyers   membarrier/x86: P...
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  	select ARCH_HAS_MEMBARRIER_SYNC_CORE
0ebeea8ca   Daniel Borkmann   bpf: Restrict bpf...
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  	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
c763ea265   Ingo Molnar   x86/kconfig: Sort...
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  	select ARCH_HAS_PMEM_API		if X86_64
175967318   Robin Murphy   mm: introduce ARC...
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  	select ARCH_HAS_PTE_DEVMAP		if X86_64
3010a5ea6   Laurent Dufour   mm: introduce ARC...
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  	select ARCH_HAS_PTE_SPECIAL
0aed55af8   Dan Williams   x86, uaccess: int...
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  	select ARCH_HAS_UACCESS_FLUSHCACHE	if X86_64
ec6347bb4   Dan Williams   x86, powerpc: Ren...
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  	select ARCH_HAS_COPY_MC			if X86_64
d2852a224   Daniel Borkmann   arch: add ARCH_HA...
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  	select ARCH_HAS_SET_MEMORY
d253ca0c3   Rick Edgecombe   x86/mm/cpa: Add s...
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  	select ARCH_HAS_SET_DIRECT_MAP
ad21fc4fa   Laura Abbott   arch: Move CONFIG...
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  	select ARCH_HAS_STRICT_KERNEL_RWX
  	select ARCH_HAS_STRICT_MODULE_RWX
ac1ab12a3   Mathieu Desnoyers   lockin/x86: Imple...
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  	select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
25c619e59   Brian Gerst   x86/entry/32: Ena...
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  	select ARCH_HAS_SYSCALL_WRAPPER
c6d308534   Andrey Ryabinin   UBSAN: run-time u...
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  	select ARCH_HAS_UBSAN_SANITIZE_ALL
7e01ccb43   Zong Li   x86: mm: use ARCH...
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  	select ARCH_HAS_DEBUG_WX
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select ARCH_HAVE_NMI_SAFE_CMPXCHG
  	select ARCH_MIGHT_HAVE_ACPI_PDC		if ACPI
77fbbc811   Mark Salter   x86: select ARCH_...
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  	select ARCH_MIGHT_HAVE_PC_PARPORT
5e2c18c0e   Mark Salter   Input: i8042 - se...
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  	select ARCH_MIGHT_HAVE_PC_SERIO
3599fe12a   Thomas Gleixner   x86/stacktrace: U...
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  	select ARCH_STACKWALK
2c870e611   Arnd Bergmann   arm64: fix ACPI d...
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  	select ARCH_SUPPORTS_ACPI
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select ARCH_SUPPORTS_ATOMIC_RMW
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select ARCH_SUPPORTS_NUMA_BALANCING	if X86_64
bb613f1c2   Sami Tolvanen   FROMLIST: x86, bu...
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  	select ARCH_SUPPORTS_LTO_CLANG		if X86_64
  	select ARCH_SUPPORTS_LTO_CLANG_THIN	if X86_64
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select ARCH_USE_BUILTIN_BSWAP
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select ARCH_USE_QUEUED_RWLOCKS
  	select ARCH_USE_QUEUED_SPINLOCKS
2ce0d7f97   Mark Brown   x86/asm: Provide ...
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  	select ARCH_USE_SYM_ANNOTATIONS
ce4a4e565   Andy Lutomirski   x86/mm: Remove th...
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  	select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
81c22041d   Daniel Borkmann   bpf, x86, arm64: ...
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  	select ARCH_WANT_DEFAULT_BPF_JIT	if X86_64
c763ea265   Ingo Molnar   x86/kconfig: Sort...
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  	select ARCH_WANTS_DYNAMIC_TASK_STRUCT
3876d4a38   Alexandre Ghiti   x86, arm64: Move ...
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  	select ARCH_WANT_HUGE_PMD_SHARE
59612b24f   Nathan Chancellor   kbuild: Hoist '--...
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  	select ARCH_WANT_LD_ORPHAN_WARN
38d8b4e6b   Huang Ying   mm, THP, swap: de...
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  	select ARCH_WANTS_THP_SWAP		if X86_64
109167063   Shile Zhang   scripts/sorttable...
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  	select BUILDTIME_TABLE_SORT
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select CLKEVT_I8253
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select CLOCKSOURCE_VALIDATE_LAST_CYCLE
  	select CLOCKSOURCE_WATCHDOG
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select DCACHE_WORD_ACCESS
45471cd98   Linus Torvalds   Merge tag 'edac_f...
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  	select EDAC_ATOMIC_SCRUB
  	select EDAC_SUPPORT
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select GENERIC_CLOCKEVENTS
  	select GENERIC_CLOCKEVENTS_BROADCAST	if X86_64 || (X86_32 && X86_LOCAL_APIC)
  	select GENERIC_CLOCKEVENTS_MIN_ADJUST
  	select GENERIC_CMOS_UPDATE
  	select GENERIC_CPU_AUTOPROBE
61dc0f555   Thomas Gleixner   x86/cpu: Implemen...
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  	select GENERIC_CPU_VULNERABILITIES
5b7c73e00   Mark Salter   x86: use generic ...
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  	select GENERIC_EARLY_IOREMAP
27d6b4d14   Thomas Gleixner   x86/entry: Use ge...
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  	select GENERIC_ENTRY
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select GENERIC_FIND_FIRST_BIT
  	select GENERIC_IOMAP
c7d6c9dd8   Thomas Gleixner   x86/apic: Impleme...
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  	select GENERIC_IRQ_EFFECTIVE_AFF_MASK	if SMP
0fa115da4   Thomas Gleixner   x86/irq/vector: I...
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  	select GENERIC_IRQ_MATRIX_ALLOCATOR	if X86_LOCAL_APIC
ad7a929fa   Thomas Gleixner   x86/irq: Use irq_...
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  	select GENERIC_IRQ_MIGRATION		if SMP
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select GENERIC_IRQ_PROBE
c201c9179   Thomas Gleixner   x86/vector/msi: S...
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  	select GENERIC_IRQ_RESERVATION_MODE
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select GENERIC_IRQ_SHOW
  	select GENERIC_PENDING_IRQ		if SMP
2ae27137b   Steven Price   x86: mm: convert ...
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  	select GENERIC_PTDUMP
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select GENERIC_SMP_IDLE_THREAD
  	select GENERIC_STRNCPY_FROM_USER
  	select GENERIC_STRNLEN_USER
  	select GENERIC_TIME_VSYSCALL
7ac870747   Vincenzo Frascino   x86/vdso: Switch ...
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  	select GENERIC_GETTIMEOFDAY
550a77a74   Dmitry Safonov   x86/vdso: Add tim...
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  	select GENERIC_VDSO_TIME_NS
39656e83d   Christoph Hellwig   mm: lift the x86_...
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  	select GUP_GET_PTE_LOW_HIGH		if X86_PAE
17e5888e4   Hans de Goede   x86: Select HARDI...
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  	select HARDIRQS_SW_RESEND
7edaeb684   Thomas Gleixner   kernel/watchdog: ...
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  	select HARDLOCKUP_CHECK_TIMESTAMP	if X86_64
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_ACPI_APEI			if ACPI
  	select HAVE_ACPI_APEI_NMI		if ACPI
  	select HAVE_ALIGNED_STRUCT_PAGE		if SLUB
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_ARCH_AUDITSYSCALL
  	select HAVE_ARCH_HUGE_VMAP		if X86_64 || X86_PAE
  	select HAVE_ARCH_JUMP_LABEL
b34006c42   Ard Biesheuvel   x86/jump_table: U...
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  	select HAVE_ARCH_JUMP_LABEL_RELATIVE
d17a1d97d   Andrey Ryabinin   x86/mm/kasan: don...
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  	select HAVE_ARCH_KASAN			if X86_64
0609ae011   Daniel Axtens   x86/kasan: suppor...
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  	select HAVE_ARCH_KASAN_VMALLOC		if X86_64
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_ARCH_KGDB
9e08f57d6   Daniel Cashman   x86: mm: support ...
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  	select HAVE_ARCH_MMAP_RND_BITS		if MMU
  	select HAVE_ARCH_MMAP_RND_COMPAT_BITS	if MMU && COMPAT
1b028f784   Dmitry Safonov   x86/mm: Introduce...
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  	select HAVE_ARCH_COMPAT_MMAP_BASES	if MMU && COMPAT
271ca7887   Ard Biesheuvel   arch: enable rela...
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  	select HAVE_ARCH_PREL32_RELOCATIONS
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_ARCH_SECCOMP_FILTER
f7d83c1cf   Kees Cook   x86: Implement th...
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  	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
afaef01c0   Alexander Popov   x86/entry: Add ST...
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  	select HAVE_ARCH_STACKLEAK
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_ARCH_TRACEHOOK
  	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
a00cc7d9d   Matthew Wilcox   mm, x86: add supp...
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  	select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
b64d8d1e1   Peter Xu   mm/userfaultfd: d...
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  	select HAVE_ARCH_USERFAULTFD_WP         if X86_64 && USERFAULTFD
e37e43a49   Andy Lutomirski   x86/mm/64: Enable...
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  	select HAVE_ARCH_VMAP_STACK		if X86_64
c763ea265   Ingo Molnar   x86/kconfig: Sort...
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  	select HAVE_ARCH_WITHIN_STACK_FRAMES
2ff2b7ec6   Masahiro Yamada   kbuild: add CONFI...
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  	select HAVE_ASM_MODVERSIONS
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_CMPXCHG_DOUBLE
  	select HAVE_CMPXCHG_LOCAL
  	select HAVE_CONTEXT_TRACKING		if X86_64
cf4db2597   Steven Rostedt   ftrace: Rename co...
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  	select HAVE_C_RECORDMCOUNT
78a2549ec   Sami Tolvanen   FROMLIST: x86, bu...
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  	select HAVE_OBJTOOL_MCOUNT		if STACK_VALIDATION
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_DEBUG_KMEMLEAK
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_DMA_CONTIGUOUS
677aa9f77   Steven Rostedt   ftrace: add have ...
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  	select HAVE_DYNAMIC_FTRACE
06aeaaeab   Masami Hiramatsu   ftrace: Move ARCH...
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  	select HAVE_DYNAMIC_FTRACE_WITH_REGS
562955fe6   Steven Rostedt (VMware)   ftrace/x86: Add r...
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  	select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
03f5781be   Wang YanQing   bpf, x86_32: add ...
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  	select HAVE_EBPF_JIT
58340a07c   Johannes Berg   introduce HAVE_EF...
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  	select HAVE_EFFICIENT_UNALIGNED_ACCESS
6630a8e50   Christoph Hellwig   eisa: consolidate...
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  	select HAVE_EISA
5f56a5dfd   Jiri Slaby   exit_thread: remo...
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  	select HAVE_EXIT_THREAD
67a929e09   Christoph Hellwig   mm: rename CONFIG...
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  	select HAVE_FAST_GUP
644e0e8dc   Steven Rostedt (VMware)   x86/ftrace: Add -...
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  	select HAVE_FENTRY			if X86_64 || DYNAMIC_FTRACE
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_FTRACE_MCOUNT_RECORD
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_FUNCTION_GRAPH_TRACER
  	select HAVE_FUNCTION_TRACER
6b90bd4ba   Emese Revfy   GCC plugin infras...
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  	select HAVE_GCC_PLUGINS
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_HW_BREAKPOINT
  	select HAVE_IDE
  	select HAVE_IOREMAP_PROT
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_IRQ_TIME_ACCOUNTING
2e9f3bddc   H. Peter Anvin   bzip2/lzma: make ...
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  	select HAVE_KERNEL_BZIP2
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_KERNEL_GZIP
  	select HAVE_KERNEL_LZ4
2e9f3bddc   H. Peter Anvin   bzip2/lzma: make ...
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  	select HAVE_KERNEL_LZMA
13510997d   Albin Tonnerre   x86: add support ...
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  	select HAVE_KERNEL_LZO
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_KERNEL_XZ
fb46d057d   Nick Terrell   x86: Add support ...
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  	select HAVE_KERNEL_ZSTD
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_KPROBES
  	select HAVE_KPROBES_ON_FTRACE
540adea38   Masami Hiramatsu   error-injection: ...
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  	select HAVE_FUNCTION_ERROR_INJECTION
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_KRETPROBES
  	select HAVE_KVM
  	select HAVE_LIVEPATCH			if X86_64
0102752e4   Frederic Weisbecker   hw-breakpoints: S...
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  	select HAVE_MIXED_BREAKPOINTS_REGS
ee9f8fce9   Josh Poimboeuf   x86/unwind: Add t...
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  	select HAVE_MOD_ARCH_SPECIFIC
9f132f7e1   Joel Fernandes (Google)   mm: select HAVE_M...
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  	select HAVE_MOVE_PMD
42a0bb3f7   Petr Mladek   printk/nmi: gener...
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  	select HAVE_NMI
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_OPROFILE
  	select HAVE_OPTPROBES
  	select HAVE_PCSPKR_PLATFORM
  	select HAVE_PERF_EVENTS
c01d43233   Frederic Weisbecker   lockup_detector: ...
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  	select HAVE_PERF_EVENTS_NMI
92e5aae45   Nicholas Piggin   kernel/watchdog: ...
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  	select HAVE_HARDLOCKUP_DETECTOR_PERF	if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
eb01d42a7   Christoph Hellwig   PCI: consolidate ...
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  	select HAVE_PCI
c5e63197d   Jiri Olsa   perf: Unified API...
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  	select HAVE_PERF_REGS
c5ebcedb5   Jiri Olsa   perf: Add ability...
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  	select HAVE_PERF_USER_STACK_DUMP
ff2e6d725   Peter Zijlstra   asm-generic/tlb: ...
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  	select MMU_GATHER_RCU_TABLE_FREE		if PARAVIRT
009980855   Thomas Gleixner   x86: Select POSIX...
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  	select HAVE_POSIX_CPU_TIMERS_TASK_WORK
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_REGS_AND_STACK_ACCESS_API
6415b38ba   Jiri Slaby   x86/stacktrace: E...
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  	select HAVE_RELIABLE_STACKTRACE		if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION
3c88ee194   Masami Hiramatsu   x86: ptrace: Add ...
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  	select HAVE_FUNCTION_ARG_ACCESS_API
d148eac0e   Masahiro Yamada   Kbuild: rename HA...
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  	select HAVE_STACKPROTECTOR		if CC_HAS_SANE_STACKPROTECTOR
c763ea265   Ingo Molnar   x86/kconfig: Sort...
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  	select HAVE_STACK_VALIDATION		if X86_64
e6d6c071f   Josh Poimboeuf   x86/static_call: ...
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  	select HAVE_STATIC_CALL
1e7e47883   Josh Poimboeuf   x86/static_call: ...
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  	select HAVE_STATIC_CALL_INLINE		if HAVE_STACK_VALIDATION
d6761b8fd   Mathieu Desnoyers   x86: Add support ...
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  	select HAVE_RSEQ
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_SYSCALL_TRACEPOINTS
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select HAVE_UNSTABLE_SCHED_CLOCK
7c68af6e3   Avi Kivity   core, x86: Add us...
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  	select HAVE_USER_RETURN_NOTIFIER
7ac870747   Vincenzo Frascino   x86/vdso: Switch ...
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  	select HAVE_GENERIC_VDSO
05736e4ac   Thomas Gleixner   cpu/hotplug: Prov...
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  	select HOTPLUG_SMT			if SMP
c0185808e   Thomas Gleixner   x86: Enable force...
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  	select IRQ_FORCED_THREADING
86596f0a2   Christoph Hellwig   scatterlist: move...
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  	select NEED_SG_DMA_LENGTH
2eac9c2df   Christoph Hellwig   PCI: consolidate ...
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  	select PCI_DOMAINS			if PCI
625210cfa   Sinan Kaya   x86/Kconfig: Sele...
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  	select PCI_LOCKLESS_CONFIG		if PCI
6471b825c   Ingo Molnar   x86/kconfig: Reor...
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  	select PERF_EVENTS
3195ef59c   Prarit Bhargava   x86: Do full rtc ...
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  	select RTC_LIB
d6faca40f   Arnd Bergmann   rtc: move mc14681...
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  	select RTC_MC146818_LIB
6471b825c   Ingo Molnar   x86/kconfig: Reor...
238
  	select SPARSE_IRQ
83fe27ea5   Pranith Kumar   rcu: Make SRCU op...
239
  	select SRCU
1e7e47883   Josh Poimboeuf   x86/static_call: ...
240
  	select STACK_VALIDATION			if HAVE_STACK_VALIDATION && (HAVE_STATIC_CALL_INLINE || RETPOLINE)
6471b825c   Ingo Molnar   x86/kconfig: Reor...
241
  	select SYSCTL_EXCEPTION_TRACE
15f4eae70   Andy Lutomirski   x86: Move thread_...
242
  	select THREAD_INFO_IN_TASK
6471b825c   Ingo Molnar   x86/kconfig: Reor...
243
244
  	select USER_STACKTRACE_SUPPORT
  	select VIRT_TO_BUS
3b02a051d   Ingo Molnar   Merge tag 'v5.7-r...
245
  	select HAVE_ARCH_KCSAN			if X86_64
6471b825c   Ingo Molnar   x86/kconfig: Reor...
246
  	select X86_FEATURE_NAMES		if PROC_FS
0c608dad2   Aubrey Li   x86/process: Add ...
247
  	select PROC_PID_ARCH_STATUS		if PROC_FS
9e2b4be37   Nayna Jain   ima: add a new CO...
248
  	imply IMA_SECURE_AND_OR_TRUSTED_BOOT    if EFI
7d8330a56   Balbir Singh   KVM is not seen u...
249

ba7e4d13f   Ingo Molnar   perf, x86: Add IN...
250
  config INSTRUCTION_DECODER
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
251
252
  	def_bool y
  	depends on KPROBES || PERF_EVENTS || UPROBES
ba7e4d13f   Ingo Molnar   perf, x86: Add IN...
253

51b26ada7   Linus Torvalds   x86: unify arch/x...
254
255
256
257
  config OUTPUT_FORMAT
  	string
  	default "elf32-i386" if X86_32
  	default "elf64-x86-64" if X86_64
8d5fffb92   Sam Ravnborg   x86: move all sim...
258
  config LOCKDEP_SUPPORT
3c2362e62   Harvey Harrison   x86: use def_bool...
259
  	def_bool y
8d5fffb92   Sam Ravnborg   x86: move all sim...
260
261
  
  config STACKTRACE_SUPPORT
3c2362e62   Harvey Harrison   x86: use def_bool...
262
  	def_bool y
8d5fffb92   Sam Ravnborg   x86: move all sim...
263

8d5fffb92   Sam Ravnborg   x86: move all sim...
264
  config MMU
3c2362e62   Harvey Harrison   x86: use def_bool...
265
  	def_bool y
8d5fffb92   Sam Ravnborg   x86: move all sim...
266

9e08f57d6   Daniel Cashman   x86: mm: support ...
267
268
269
270
271
272
273
274
275
276
277
278
279
  config ARCH_MMAP_RND_BITS_MIN
  	default 28 if 64BIT
  	default 8
  
  config ARCH_MMAP_RND_BITS_MAX
  	default 32 if 64BIT
  	default 16
  
  config ARCH_MMAP_RND_COMPAT_BITS_MIN
  	default 8
  
  config ARCH_MMAP_RND_COMPAT_BITS_MAX
  	default 16
8d5fffb92   Sam Ravnborg   x86: move all sim...
280
281
282
283
  config SBUS
  	bool
  
  config GENERIC_ISA_DMA
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
284
285
  	def_bool y
  	depends on ISA_DMA_API
8d5fffb92   Sam Ravnborg   x86: move all sim...
286

8d5fffb92   Sam Ravnborg   x86: move all sim...
287
  config GENERIC_BUG
3c2362e62   Harvey Harrison   x86: use def_bool...
288
  	def_bool y
8d5fffb92   Sam Ravnborg   x86: move all sim...
289
  	depends on BUG
b93a531e3   Jan Beulich   allow bug table e...
290
291
292
293
  	select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  
  config GENERIC_BUG_RELATIVE_POINTERS
  	bool
8d5fffb92   Sam Ravnborg   x86: move all sim...
294

8d5fffb92   Sam Ravnborg   x86: move all sim...
295
  config ARCH_MAY_HAVE_PC_FDC
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
296
297
  	def_bool y
  	depends on ISA_DMA_API
8d5fffb92   Sam Ravnborg   x86: move all sim...
298

1032c0ba9   Sam Ravnborg   x86: arch/x86/Kco...
299
300
  config GENERIC_CALIBRATE_DELAY
  	def_bool y
9a0b84158   venkatesh.pallipadi@intel.com   cpuidle: Add a po...
301
302
  config ARCH_HAS_CPU_RELAX
  	def_bool y
1b27d05b6   Pekka Enberg   mm: move cache_li...
303
304
  config ARCH_HAS_CACHE_LINE_SIZE
  	def_bool y
316d097c4   Dave Hansen   x86/pti: Filter a...
305
306
  config ARCH_HAS_FILTER_PGPROT
  	def_bool y
dd5af90a7   Mike Travis   x86/non-x86: perc...
307
  config HAVE_SETUP_PER_CPU_AREA
89c9c4c58   Brian Gerst   x86: make Voyager...
308
  	def_bool y
b32ef636a   travis@sgi.com   percpu: use a kco...
309

08fc45806   Tejun Heo   percpu: build fir...
310
311
312
313
  config NEED_PER_CPU_EMBED_FIRST_CHUNK
  	def_bool y
  
  config NEED_PER_CPU_PAGE_FIRST_CHUNK
11124411a   Tejun Heo   x86: convert to t...
314
  	def_bool y
801e4062f   Johannes Berg   Hibernation: Clea...
315
316
  config ARCH_HIBERNATION_POSSIBLE
  	def_bool y
801e4062f   Johannes Berg   Hibernation: Clea...
317

f4cb57007   Johannes Berg   Suspend: Clean up...
318
319
  config ARCH_SUSPEND_POSSIBLE
  	def_bool y
f4cb57007   Johannes Berg   Suspend: Clean up...
320

53313b2c9   Steve Capper   x86: mm: Remove g...
321
322
  config ARCH_WANT_GENERAL_HUGETLB
  	def_bool y
8d5fffb92   Sam Ravnborg   x86: move all sim...
323
  config ZONE_DMA32
e0fd24a3b   Jan Beulich   x86/Kconfig: Avoi...
324
  	def_bool y if X86_64
8d5fffb92   Sam Ravnborg   x86: move all sim...
325

8d5fffb92   Sam Ravnborg   x86: move all sim...
326
  config AUDIT_ARCH
e0fd24a3b   Jan Beulich   x86/Kconfig: Avoi...
327
  	def_bool y if X86_64
8d5fffb92   Sam Ravnborg   x86: move all sim...
328

6a11f75b6   Akinobu Mita   generic debug pag...
329
330
  config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  	def_bool y
d6f2d75a7   Andrey Ryabinin   x86/kasan: Move K...
331
332
333
334
  config KASAN_SHADOW_OFFSET
  	hex
  	depends on KASAN
  	default 0xdffffc0000000000
69575d388   Shane Wang   x86, intel_txt: c...
335
336
  config HAVE_INTEL_TXT
  	def_bool y
6ea303864   Kees Cook   arch/x86: remove ...
337
  	depends on INTEL_IOMMU && ACPI
69575d388   Shane Wang   x86, intel_txt: c...
338

6b0c3d44d   Sam Ravnborg   x86: unify arch/x...
339
340
341
342
343
344
345
  config X86_32_SMP
  	def_bool y
  	depends on X86_32 && SMP
  
  config X86_64_SMP
  	def_bool y
  	depends on X86_64 && SMP
ccbeed3a0   Tejun Heo   x86: make lazy %g...
346
347
  config X86_32_LAZY_GS
  	def_bool y
8458f8c2d   Masahiro Yamada   x86: fix dependen...
348
  	depends on X86_32 && !STACKPROTECTOR
ccbeed3a0   Tejun Heo   x86: make lazy %g...
349

2b1444983   Srikar Dronamraju   uprobes, mm, x86:...
350
351
  config ARCH_SUPPORTS_UPROBES
  	def_bool y
d20642f0a   Rob Herring   x86: move FIX_EAR...
352
353
  config FIX_EARLYCON_MEM
  	def_bool y
94d49eb30   Kirill A. Shutemov   x86/mm: Decouple ...
354
355
  config DYNAMIC_PHYSICAL_MASK
  	bool
982333683   Kirill A. Shutemov   x86: expose numbe...
356
357
  config PGTABLE_LEVELS
  	int
77ef56e4f   Kirill A. Shutemov   x86: Enable 5-lev...
358
  	default 5 if X86_5LEVEL
982333683   Kirill A. Shutemov   x86: expose numbe...
359
360
361
  	default 4 if X86_64
  	default 3 if X86_PAE
  	default 2
2a61f4747   Masahiro Yamada   stack-protector: ...
362
363
364
365
366
367
368
  config CC_HAS_SANE_STACKPROTECTOR
  	bool
  	default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC)) if 64BIT
  	default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC))
  	help
  	   We have to make sure stack protector is unconditionally disabled if
  	   the compiler produces broken code.
506f1d07b   Sam Ravnborg   x86: move the res...
369
  menu "Processor type and features"
5ee715354   Randy Dunlap   x86/kconfig: Move...
370
371
372
373
374
375
376
377
378
  config ZONE_DMA
  	bool "DMA memory allocation support" if EXPERT
  	default y
  	help
  	  DMA memory allocation support allows devices with less than 32-bit
  	  addressing to allocate within the first 16MB of address space.
  	  Disable if no such devices will be used.
  
  	  If unsure, say Y.
506f1d07b   Sam Ravnborg   x86: move the res...
379
380
  config SMP
  	bool "Symmetric multi-processing support"
a7f7f6248   Masahiro Yamada   treewide: replace...
381
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
382
  	  This enables support for systems with more than one CPU. If you have
4a4741577   Robert Graffham   Kconfig: update f...
383
384
  	  a system with only one CPU, say N. If you have a system with more
  	  than one CPU, say Y.
506f1d07b   Sam Ravnborg   x86: move the res...
385

4a4741577   Robert Graffham   Kconfig: update f...
386
  	  If you say N here, the kernel will run on uni- and multiprocessor
506f1d07b   Sam Ravnborg   x86: move the res...
387
388
  	  machines, but will use only one CPU of a multiprocessor machine. If
  	  you say Y here, the kernel will run on many, but not all,
4a4741577   Robert Graffham   Kconfig: update f...
389
  	  uniprocessor machines. On a uniprocessor machine, the kernel
506f1d07b   Sam Ravnborg   x86: move the res...
390
391
392
393
394
395
396
397
398
399
  	  will run faster if you say N here.
  
  	  Note that if you say Y here and choose architecture "586" or
  	  "Pentium" under "Processor family", the kernel will not work on 486
  	  architectures. Similarly, multiprocessor kernels for the "PPro"
  	  architecture may not work on all Pentium based boards.
  
  	  People using multiprocessor machines who say Y here should also say
  	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  	  Management" code will be disabled if you say Y here.
cb1aaebea   Mauro Carvalho Chehab   docs: fix broken ...
400
  	  See also <file:Documentation/x86/i386/IO-APIC.rst>,
4f4cfa6c5   Mauro Carvalho Chehab   docs: admin-guide...
401
  	  <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO available at
506f1d07b   Sam Ravnborg   x86: move the res...
402
403
404
  	  <http://www.tldp.org/docs.html#howto>.
  
  	  If you don't know what to do here, say N.
9def39be4   Josh Triplett   x86: Support comp...
405
406
407
  config X86_FEATURE_NAMES
  	bool "Processor feature human-readable names" if EMBEDDED
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
408
  	help
9def39be4   Josh Triplett   x86: Support comp...
409
410
411
412
413
414
  	  This option compiles in a table of x86 feature bits and corresponding
  	  names.  This is required to support /proc/cpuinfo and a few kernel
  	  messages.  You can disable this to save space, at the expense of
  	  making those few kernel messages show numeric feature bits instead.
  
  	  If in doubt, say Y.
06cd9a7dc   Yinghai Lu   x86: add x2apic c...
415
416
  config X86_X2APIC
  	bool "Support x2apic"
19e3d60d4   Jan Kiszka   x86: Let x2APIC s...
417
  	depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
a7f7f6248   Masahiro Yamada   treewide: replace...
418
  	help
06cd9a7dc   Yinghai Lu   x86: add x2apic c...
419
420
421
422
  	  This enables x2apic support on CPUs that have this feature.
  
  	  This allows 32-bit apic IDs (so it can support very large systems),
  	  and accesses the local apic via MSRs not via mmio.
06cd9a7dc   Yinghai Lu   x86: add x2apic c...
423
  	  If you don't know what to do here, say N.
6695c85b2   Yinghai Lu   x86: let MPS supp...
424
  config X86_MPPARSE
6e87f9b7e   Bin Gao   arch/x86/Kconfig:...
425
  	bool "Enable MPS table" if ACPI || SFI
7a5276889   Jan Beulich   x86: simplify X86...
426
  	default y
5ab74722a   Ingo Molnar   x86, VisWS: turn ...
427
  	depends on X86_LOCAL_APIC
a7f7f6248   Masahiro Yamada   treewide: replace...
428
  	help
6695c85b2   Yinghai Lu   x86: let MPS supp...
429
430
  	  For old smp systems that do not have proper acpi support. Newer systems
  	  (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
6695c85b2   Yinghai Lu   x86: let MPS supp...
431

ddd70cf93   Jun Nakajima   goldfish: platfor...
432
  config GOLDFISH
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
433
434
  	def_bool y
  	depends on X86_GOLDFISH
ddd70cf93   Jun Nakajima   goldfish: platfor...
435

76b043848   David Woodhouse   x86/retpoline: Ad...
436
437
438
439
440
441
442
443
  config RETPOLINE
  	bool "Avoid speculative indirect branches in kernel"
  	default y
  	help
  	  Compile kernel with the retpoline compiler options to guard against
  	  kernel-to-user data leaks by avoiding speculative indirect
  	  branches. Requires a compiler with -mindirect-branch=thunk-extern
  	  support for full protection. The kernel may run slower.
e6d429313   Johannes Weiner   x86/resctrl: Avoi...
444
445
  config X86_CPU_RESCTRL
  	bool "x86 CPU resource control support"
6fe07ce35   Babu Moger   x86/resctrl: Rena...
446
  	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
59fe5a77d   Thomas Gleixner   x86/intel_rdt: Se...
447
  	select KERNFS
e79f15a45   Chen Yu   x86/resctrl: Add ...
448
  	select PROC_CPU_RESCTRL		if PROC_FS
78e99b4a2   Fenghua Yu   x86/intel_rdt: Ad...
449
  	help
e6d429313   Johannes Weiner   x86/resctrl: Avoi...
450
  	  Enable x86 CPU resource control support.
6fe07ce35   Babu Moger   x86/resctrl: Rena...
451
452
453
454
455
456
457
458
459
460
461
  
  	  Provide support for the allocation and monitoring of system resources
  	  usage by the CPU.
  
  	  Intel calls this Intel Resource Director Technology
  	  (Intel(R) RDT). More information about RDT can be found in the
  	  Intel x86 Architecture Software Developer Manual.
  
  	  AMD calls this AMD Platform Quality of Service (AMD QoS).
  	  More information about AMD QoS can be found in the AMD64 Technology
  	  Platform Quality of Service Extensions manual.
78e99b4a2   Fenghua Yu   x86/intel_rdt: Ad...
462
463
  
  	  Say N if unsure.
8425091ff   Ravikiran G Thirumalai   x86: improve the ...
464
  if X86_32
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
465
466
467
  config X86_BIGSMP
  	bool "Support for big SMP systems with more than 8 CPUs"
  	depends on SMP
a7f7f6248   Masahiro Yamada   treewide: replace...
468
  	help
e133f6eac   Randy Dunlap   x86/Kconfig: Corr...
469
  	  This option is needed for the systems that have more than 8 CPUs.
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
470

c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
471
472
473
  config X86_EXTENDED_PLATFORM
  	bool "Support for extended (non-PC) x86 platforms"
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
474
  	help
06ac8346a   Ingo Molnar   x86: cleanup, int...
475
476
477
  	  If you disable this option then the kernel will only support
  	  standard PC platforms. (which covers the vast majority of
  	  systems out there.)
8425091ff   Ravikiran G Thirumalai   x86: improve the ...
478
479
  	  If you enable this option then you'll be able to select support
  	  for the following (non-PC) 32 bit x86 platforms:
cb7b80237   Ben Hutchings   x86/platform: Mak...
480
  		Goldfish (Android emulator)
8425091ff   Ravikiran G Thirumalai   x86: improve the ...
481
  		AMD Elan
8425091ff   Ravikiran G Thirumalai   x86: improve the ...
482
483
  		RDC R-321x SoC
  		SGI 320/540 (Visual Workstation)
83125a3a1   Alessandro Rubini   x86, platform: In...
484
  		STA2X11-based (e.g. Northville)
3f4110a48   Thomas Gleixner   x86: Add Mooresto...
485
  		Moorestown MID devices
06ac8346a   Ingo Molnar   x86: cleanup, int...
486
487
488
  
  	  If you have one of these systems, or if you want to build a
  	  generic distribution kernel, say Y here - otherwise say N.
8425091ff   Ravikiran G Thirumalai   x86: improve the ...
489
  endif
06ac8346a   Ingo Molnar   x86: cleanup, int...
490

8425091ff   Ravikiran G Thirumalai   x86: improve the ...
491
492
493
494
  if X86_64
  config X86_EXTENDED_PLATFORM
  	bool "Support for extended (non-PC) x86 platforms"
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
495
  	help
8425091ff   Ravikiran G Thirumalai   x86: improve the ...
496
497
498
499
500
501
  	  If you disable this option then the kernel will only support
  	  standard PC platforms. (which covers the vast majority of
  	  systems out there.)
  
  	  If you enable this option then you'll be able to select support
  	  for the following (non-PC) 64 bit x86 platforms:
44b111b51   Steffen Persvold   x86: Add NumaChip...
502
  		Numascale NumaChip
8425091ff   Ravikiran G Thirumalai   x86: improve the ...
503
504
505
506
507
508
  		ScaleMP vSMP
  		SGI Ultraviolet
  
  	  If you have one of these systems, or if you want to build a
  	  generic distribution kernel, say Y here - otherwise say N.
  endif
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
509
510
  # This is an alphabetically sorted list of 64 bit extended platforms
  # Please maintain the alphabetic order if and when there are additions
44b111b51   Steffen Persvold   x86: Add NumaChip...
511
512
513
514
515
516
517
  config X86_NUMACHIP
  	bool "Numascale NumaChip"
  	depends on X86_64
  	depends on X86_EXTENDED_PLATFORM
  	depends on NUMA
  	depends on SMP
  	depends on X86_X2APIC
f9726bfd4   Daniel J Blueman   x86/PCI: Add Numa...
518
  	depends on PCI_MMCONFIG
a7f7f6248   Masahiro Yamada   treewide: replace...
519
  	help
44b111b51   Steffen Persvold   x86: Add NumaChip...
520
521
522
  	  Adds support for Numascale NumaChip large-SMP systems. Needed to
  	  enable more than ~168 cores.
  	  If you don't have one of these, you should say N here.
506f1d07b   Sam Ravnborg   x86: move the res...
523

c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
524
525
  config X86_VSMP
  	bool "ScaleMP vSMP"
6276a074c   Borislav Petkov   x86: Make Linux g...
526
  	select HYPERVISOR_GUEST
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
527
528
529
  	select PARAVIRT
  	depends on X86_64 && PCI
  	depends on X86_EXTENDED_PLATFORM
ead91d4b8   Shai Fultheim   x86/vsmp: Fix num...
530
  	depends on SMP
a7f7f6248   Masahiro Yamada   treewide: replace...
531
  	help
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
532
533
534
  	  Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is
  	  supposed to run on these EM64T-based machines.  Only choose this option
  	  if you have one of these machines.
5e3a77e9a   Florian Fainelli   x86: add support ...
535

03b486322   Nick Piggin   x86: make UV supp...
536
537
538
  config X86_UV
  	bool "SGI Ultraviolet"
  	depends on X86_64
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
539
  	depends on X86_EXTENDED_PLATFORM
54c28d294   Jack Steiner   x86, uv: add Kcon...
540
  	depends on NUMA
1ecb4ae5f   Andrew Morton   arch/x86/Kconfig:...
541
  	depends on EFI
9d6c26e73   Suresh Siddha   x86: x2apic, IR: ...
542
  	depends on X86_X2APIC
1222e564c   Ingo Molnar   x86/platform/uv: ...
543
  	depends on PCI
a7f7f6248   Masahiro Yamada   treewide: replace...
544
  	help
03b486322   Nick Piggin   x86: make UV supp...
545
546
  	  This option is needed in order to support SGI Ultraviolet systems.
  	  If you don't have one of these, you should say N here.
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
547
548
  # Following is an alphabetically sorted list of 32 bit extended platforms
  # Please maintain the alphabetic order if and when there are additions
506f1d07b   Sam Ravnborg   x86: move the res...
549

ddd70cf93   Jun Nakajima   goldfish: platfor...
550
  config X86_GOLDFISH
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
551
552
  	bool "Goldfish (Virtual Platform)"
  	depends on X86_EXTENDED_PLATFORM
a7f7f6248   Masahiro Yamada   treewide: replace...
553
  	help
ddd70cf93   Jun Nakajima   goldfish: platfor...
554
555
556
  	 Enable support for the Goldfish virtual platform used primarily
  	 for Android development. Unless you are building for the Android
  	 Goldfish emulator say N here.
c751e17b5   Thomas Gleixner   x86: Add CE4100 p...
557
558
559
560
  config X86_INTEL_CE
  	bool "CE4100 TV platform"
  	depends on PCI
  	depends on PCI_GODIRECT
6084a6e23   Jiang Liu   x86: ce4100, irq:...
561
  	depends on X86_IO_APIC
c751e17b5   Thomas Gleixner   x86: Add CE4100 p...
562
563
  	depends on X86_32
  	depends on X86_EXTENDED_PLATFORM
37bc9f507   Dirk Brandewie   x86: Ce4100: Add ...
564
  	select X86_REBOOTFIXUPS
da6b737b9   Sebastian Andrzej Siewior   x86: Add device t...
565
566
  	select OF
  	select OF_EARLY_FLATTREE
a7f7f6248   Masahiro Yamada   treewide: replace...
567
  	help
c751e17b5   Thomas Gleixner   x86: Add CE4100 p...
568
569
570
  	  Select for the Intel CE media processor (CE4100) SOC.
  	  This option compiles in support for the CE4100 SOC for settop
  	  boxes and media devices.
4cb9b00f4   David Cohen   x86, intel-mid: R...
571
  config X86_INTEL_MID
43605ef18   Alan Cox   x86, config: Intr...
572
  	bool "Intel MID platform support"
43605ef18   Alan Cox   x86, config: Intr...
573
  	depends on X86_EXTENDED_PLATFORM
edc6bc784   David Cohen   x86/intel/mid: Fi...
574
  	depends on X86_PLATFORM_DEVICES
1ea7c6737   Alan Cox   x86/config: Revam...
575
  	depends on PCI
3fda5bb42   Andy Shevchenko   x86/platform/inte...
576
  	depends on X86_64 || (PCI_GOANY && X86_32)
1ea7c6737   Alan Cox   x86/config: Revam...
577
  	depends on X86_IO_APIC
7c9c3a1e5   Alan Cox   x86/intel config:...
578
  	select SFI
4cb9b00f4   David Cohen   x86, intel-mid: R...
579
  	select I2C
7c9c3a1e5   Alan Cox   x86/intel config:...
580
  	select DW_APB_TIMER
1ea7c6737   Alan Cox   x86/config: Revam...
581
  	select APB_TIMER
54b34aa0a   Mika Westerberg   platform/x86: int...
582
  	select INTEL_SCU_PCI
15a713df4   Mika Westerberg   x86/config: Selec...
583
  	select MFD_INTEL_MSIC
a7f7f6248   Masahiro Yamada   treewide: replace...
584
  	help
4cb9b00f4   David Cohen   x86, intel-mid: R...
585
586
587
  	  Select to build a kernel capable of supporting Intel MID (Mobile
  	  Internet Device) platform systems which do not have the PCI legacy
  	  interfaces. If you are building for a PC class system say N here.
1ea7c6737   Alan Cox   x86/config: Revam...
588

4cb9b00f4   David Cohen   x86, intel-mid: R...
589
590
  	  Intel MID platforms are based on an Intel processor and chipset which
  	  consume less power than most of the x86 derivatives.
43605ef18   Alan Cox   x86, config: Intr...
591

8bbc2a135   Bryan O'Donoghue   x86/intel/quark: ...
592
593
594
595
596
597
598
599
600
601
602
  config X86_INTEL_QUARK
  	bool "Intel Quark platform support"
  	depends on X86_32
  	depends on X86_EXTENDED_PLATFORM
  	depends on X86_PLATFORM_DEVICES
  	depends on X86_TSC
  	depends on PCI
  	depends on PCI_GOANY
  	depends on X86_IO_APIC
  	select IOSF_MBI
  	select INTEL_IMR
9ab6eb51e   Andy Shevchenko   x86/intel/quark: ...
603
  	select COMMON_CLK
a7f7f6248   Masahiro Yamada   treewide: replace...
604
  	help
8bbc2a135   Bryan O'Donoghue   x86/intel/quark: ...
605
606
607
  	  Select to include support for Quark X1000 SoC.
  	  Say Y here if you have a Quark based system such as the Arduino
  	  compatible Intel Galileo.
3d48aab1d   Mika Westerberg   x86: add support ...
608
609
  config X86_INTEL_LPSS
  	bool "Intel Low Power Subsystem Support"
5962dd22f   Sinan Kaya   x86/intel/lpss: M...
610
  	depends on X86 && ACPI && PCI
3d48aab1d   Mika Westerberg   x86: add support ...
611
  	select COMMON_CLK
0f531431d   Mathias Nyman   x86/intel/lpss: A...
612
  	select PINCTRL
eebb3e8d8   Andy Shevchenko   ACPI / LPSS: over...
613
  	select IOSF_MBI
a7f7f6248   Masahiro Yamada   treewide: replace...
614
  	help
3d48aab1d   Mika Westerberg   x86: add support ...
615
616
  	  Select to build support for Intel Low Power Subsystem such as
  	  found on Intel Lynxpoint PCH. Selecting this option enables
0f531431d   Mathias Nyman   x86/intel/lpss: A...
617
618
  	  things like clock tree (common clock framework) and pincontrol
  	  which are needed by the LPSS peripheral drivers.
3d48aab1d   Mika Westerberg   x86: add support ...
619

92082a888   Ken Xue   ACPI: add AMD ACP...
620
621
622
623
624
  config X86_AMD_PLATFORM_DEVICE
  	bool "AMD ACPI2Platform devices support"
  	depends on ACPI
  	select COMMON_CLK
  	select PINCTRL
a7f7f6248   Masahiro Yamada   treewide: replace...
625
  	help
92082a888   Ken Xue   ACPI: add AMD ACP...
626
627
628
629
  	  Select to interpret AMD specific ACPI device to platform device
  	  such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
  	  I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
  	  implemented under PINCTRL subsystem.
ced3ce760   David E. Box   x86/platform/inte...
630
631
632
  config IOSF_MBI
  	tristate "Intel SoC IOSF Sideband support for SoC platforms"
  	depends on PCI
a7f7f6248   Masahiro Yamada   treewide: replace...
633
  	help
ced3ce760   David E. Box   x86/platform/inte...
634
635
636
637
638
639
640
641
642
643
644
645
  	  This option enables sideband register access support for Intel SoC
  	  platforms. On these platforms the IOSF sideband is used in lieu of
  	  MSR's for some register accesses, mostly but not limited to thermal
  	  and power. Drivers may query the availability of this device to
  	  determine if they need the sideband in order to work on these
  	  platforms. The sideband is available on the following SoC products.
  	  This list is not meant to be exclusive.
  	   - BayTrail
  	   - Braswell
  	   - Quark
  
  	  You should say Y if you are running a kernel on one of these SoC's.
ed2226bd4   David E. Box   x86/platform/inte...
646
647
648
  config IOSF_MBI_DEBUG
  	bool "Enable IOSF sideband access through debugfs"
  	depends on IOSF_MBI && DEBUG_FS
a7f7f6248   Masahiro Yamada   treewide: replace...
649
  	help
ed2226bd4   David E. Box   x86/platform/inte...
650
651
652
653
654
655
656
657
  	  Select this option to expose the IOSF sideband access registers (MCR,
  	  MDR, MCRX) through debugfs to write and read register information from
  	  different units on the SoC. This is most useful for obtaining device
  	  state information for debug and analysis. As this is a general access
  	  mechanism, users of this option would have specific knowledge of the
  	  device they want to access.
  
  	  If you don't require the option or are in doubt, say N.
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
658
659
  config X86_RDC321X
  	bool "RDC R-321x SoC"
506f1d07b   Sam Ravnborg   x86: move the res...
660
  	depends on X86_32
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
661
662
663
  	depends on X86_EXTENDED_PLATFORM
  	select M486
  	select X86_REBOOTFIXUPS
a7f7f6248   Masahiro Yamada   treewide: replace...
664
  	help
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
665
666
667
  	  This option is needed for RDC R-321x system-on-chip, also known
  	  as R-8610-(G).
  	  If you don't have one of these chips, you should say N here.
e0c7ae376   Ingo Molnar   x86: rename X86_G...
668
  config X86_32_NON_STANDARD
9c3980176   Ingo Molnar   x86: move non-sta...
669
670
  	bool "Support non-standard 32-bit SMP architectures"
  	depends on X86_32 && SMP
c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
671
  	depends on X86_EXTENDED_PLATFORM
a7f7f6248   Masahiro Yamada   treewide: replace...
672
  	help
b5660ba76   H. Peter Anvin   x86, platforms: R...
673
674
675
676
  	  This option compiles in the bigsmp and STA2X11 default
  	  subarchitectures.  It is intended for a generic binary
  	  kernel. If you select them all, kernel will probe it one by
  	  one and will fallback to default.
d49c42884   Yinghai Lu   x86: make generic...
677

c5c606d9d   Ravikiran G Thirumalai   x86: cleanup, ren...
678
  # Alphabetically sorted list of Non standard 32 bit platforms
d49c42884   Yinghai Lu   x86: make generic...
679

d949f36f1   Linus Torvalds   x86: Fix hwpoison...
680
  config X86_SUPPORTS_MEMORY_FAILURE
6fc108a08   Jan Beulich   x86: Clean up arc...
681
  	def_bool y
d949f36f1   Linus Torvalds   x86: Fix hwpoison...
682
683
684
  	# MCE code calls memory_failure():
  	depends on X86_MCE
  	# On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
d949f36f1   Linus Torvalds   x86: Fix hwpoison...
685
686
687
  	# On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
  	depends on X86_64 || !SPARSEMEM
  	select ARCH_SUPPORTS_MEMORY_FAILURE
d949f36f1   Linus Torvalds   x86: Fix hwpoison...
688

83125a3a1   Alessandro Rubini   x86, platform: In...
689
690
691
  config STA2X11
  	bool "STA2X11 Companion Chip Support"
  	depends on X86_32_NON_STANDARD && PCI
83125a3a1   Alessandro Rubini   x86, platform: In...
692
693
  	select SWIOTLB
  	select MFD_STA2X11
0145071b3   Linus Walleij   x86: Do away with...
694
  	select GPIOLIB
a7f7f6248   Masahiro Yamada   treewide: replace...
695
  	help
83125a3a1   Alessandro Rubini   x86, platform: In...
696
697
698
699
700
  	  This adds support for boards based on the STA2X11 IO-Hub,
  	  a.k.a. "ConneXt". The chip is used in place of the standard
  	  PC chipset, so all "standard" peripherals are missing. If this
  	  option is selected the kernel will still be able to boot on
  	  standard PC machines.
82148d1d0   Shérab   x86/platform: Add...
701
702
703
  config X86_32_IRIS
  	tristate "Eurobraille/Iris poweroff module"
  	depends on X86_32
a7f7f6248   Masahiro Yamada   treewide: replace...
704
  	help
82148d1d0   Shérab   x86/platform: Add...
705
706
707
708
709
710
711
712
  	  The Iris machines from EuroBraille do not have APM or ACPI support
  	  to shut themselves down properly.  A special I/O sequence is
  	  needed to do so, which is what this module does at
  	  kernel shutdown.
  
  	  This is only for Iris machines from EuroBraille.
  
  	  If unused, say N.
ae1e9130b   Ingo Molnar   sched: rename SCH...
713
  config SCHED_OMIT_FRAME_POINTER
3c2362e62   Harvey Harrison   x86: use def_bool...
714
715
  	def_bool y
  	prompt "Single-depth WCHAN output"
a87d09143   Ken Chen   x86, sched: enabl...
716
  	depends on X86
a7f7f6248   Masahiro Yamada   treewide: replace...
717
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
718
719
720
721
722
723
  	  Calculate simpler /proc/<PID>/wchan values. If this option
  	  is disabled then wchan values will recurse back to the
  	  caller function. This provides more accurate wchan values,
  	  at the expense of slightly more scheduling overhead.
  
  	  If in doubt, say "Y".
6276a074c   Borislav Petkov   x86: Make Linux g...
724
725
  menuconfig HYPERVISOR_GUEST
  	bool "Linux guest support"
a7f7f6248   Masahiro Yamada   treewide: replace...
726
  	help
6276a074c   Borislav Petkov   x86: Make Linux g...
727
728
729
  	  Say Y here to enable options for running Linux under various hyper-
  	  visors. This option enables basic hypervisor detection and platform
  	  setup.
506f1d07b   Sam Ravnborg   x86: move the res...
730

6276a074c   Borislav Petkov   x86: Make Linux g...
731
732
  	  If you say N, all options in this submenu will be skipped and
  	  disabled, and Linux guest support won't be built in.
506f1d07b   Sam Ravnborg   x86: move the res...
733

6276a074c   Borislav Petkov   x86: Make Linux g...
734
  if HYPERVISOR_GUEST
506f1d07b   Sam Ravnborg   x86: move the res...
735

e61bd94a3   Eduardo Pereira Habkost   x86: allow enabli...
736
737
  config PARAVIRT
  	bool "Enable paravirtualization code"
a7f7f6248   Masahiro Yamada   treewide: replace...
738
  	help
e61bd94a3   Eduardo Pereira Habkost   x86: allow enabli...
739
740
741
742
  	  This changes the kernel so it can modify itself when it is run
  	  under a hypervisor, potentially improving performance significantly
  	  over full virtualization.  However, when run without a hypervisor
  	  the kernel is theoretically slower and slightly larger.
c00a280a8   Juergen Gross   x86/paravirt: Int...
743
744
  config PARAVIRT_XXL
  	bool
6276a074c   Borislav Petkov   x86: Make Linux g...
745
746
747
  config PARAVIRT_DEBUG
  	bool "paravirt-ops debugging"
  	depends on PARAVIRT && DEBUG_KERNEL
a7f7f6248   Masahiro Yamada   treewide: replace...
748
  	help
6276a074c   Borislav Petkov   x86: Make Linux g...
749
750
  	  Enable to debug paravirt_ops internals.  Specifically, BUG if
  	  a paravirt_op is missing when it is called.
b4ecc1269   Jeremy Fitzhardinge   x86: Fix performa...
751
752
  config PARAVIRT_SPINLOCKS
  	bool "Paravirtualization layer for spinlocks"
6ea303864   Kees Cook   arch/x86: remove ...
753
  	depends on PARAVIRT && SMP
a7f7f6248   Masahiro Yamada   treewide: replace...
754
  	help
b4ecc1269   Jeremy Fitzhardinge   x86: Fix performa...
755
756
757
  	  Paravirtualized spinlocks allow a pvops backend to replace the
  	  spinlock implementation with something virtualization-friendly
  	  (for example, block the virtual CPU rather than spinning).
4c4e4f613   Raghavendra K T   x86/locking/kconf...
758
759
  	  It has a minimal impact on native kernels and gives a nice performance
  	  benefit on paravirtualized KVM / Xen kernels.
b4ecc1269   Jeremy Fitzhardinge   x86: Fix performa...
760

4c4e4f613   Raghavendra K T   x86/locking/kconf...
761
  	  If you are unsure how to answer this question, answer Y.
b4ecc1269   Jeremy Fitzhardinge   x86: Fix performa...
762

ecca25029   Zhao Yakui   x86/Kconfig: Add ...
763
764
  config X86_HV_CALLBACK_VECTOR
  	def_bool n
6276a074c   Borislav Petkov   x86: Make Linux g...
765
  source "arch/x86/xen/Kconfig"
7af192c95   Gerd Hoffmann   x86: Add structs ...
766

6276a074c   Borislav Petkov   x86: Make Linux g...
767
768
769
770
  config KVM_GUEST
  	bool "KVM Guest support (including kvmclock)"
  	depends on PARAVIRT
  	select PARAVIRT_CLOCK
a1c4423b0   Marcelo Tosatti   cpuidle-haltpoll:...
771
  	select ARCH_CPUIDLE_HALTPOLL
b1d405751   Vitaly Kuznetsov   KVM: x86: Switch ...
772
  	select X86_HV_CALLBACK_VECTOR
6276a074c   Borislav Petkov   x86: Make Linux g...
773
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
774
  	help
6276a074c   Borislav Petkov   x86: Make Linux g...
775
776
777
778
779
  	  This option enables various optimizations for running under the KVM
  	  hypervisor. It includes a paravirtualized clock, so that instead
  	  of relying on a PIT (or probably other) emulation by the
  	  underlying device model, the host provides the guest with
  	  timing infrastructure such as time of day, and system time
506f1d07b   Sam Ravnborg   x86: move the res...
780

a1c4423b0   Marcelo Tosatti   cpuidle-haltpoll:...
781
  config ARCH_CPUIDLE_HALTPOLL
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
782
783
784
  	def_bool n
  	prompt "Disable host haltpoll when loading haltpoll driver"
  	help
a1c4423b0   Marcelo Tosatti   cpuidle-haltpoll:...
785
  	  If virtualized under KVM, disable host haltpoll.
7733607fb   Maran Wilson   xen/pvh: Split CO...
786
787
  config PVH
  	bool "Support for running PVH guests"
a7f7f6248   Masahiro Yamada   treewide: replace...
788
  	help
7733607fb   Maran Wilson   xen/pvh: Split CO...
789
790
  	  This option enables the PVH entry point for guest virtual machines
  	  as specified in the x86/HVM direct boot ABI.
6276a074c   Borislav Petkov   x86: Make Linux g...
791
792
793
  config PARAVIRT_TIME_ACCOUNTING
  	bool "Paravirtual steal time accounting"
  	depends on PARAVIRT
a7f7f6248   Masahiro Yamada   treewide: replace...
794
  	help
6276a074c   Borislav Petkov   x86: Make Linux g...
795
796
797
798
799
800
801
802
803
  	  Select this option to enable fine granularity task steal time
  	  accounting. Time spent executing other tasks in parallel with
  	  the current vCPU is discounted from the vCPU power. To account for
  	  that, there can be a small performance impact.
  
  	  If in doubt, say N here.
  
  config PARAVIRT_CLOCK
  	bool
97349135f   Jeremy Fitzhardinge   x86/paravirt: add...
804

4a362601b   Jan Kiszka   x86/jailhouse: Ad...
805
806
  config JAILHOUSE_GUEST
  	bool "Jailhouse non-root cell support"
abde587b6   Arnd Bergmann   x86/jailhouse: Ad...
807
  	depends on X86_64 && PCI
87e65d05b   Jan Kiszka   x86/jailhouse: En...
808
  	select X86_PM_TIMER
a7f7f6248   Masahiro Yamada   treewide: replace...
809
  	help
4a362601b   Jan Kiszka   x86/jailhouse: Ad...
810
811
812
  	  This option allows to run Linux as guest in a Jailhouse non-root
  	  cell. You can leave this option disabled if you only want to start
  	  Jailhouse and run Linux afterwards in the root cell.
ec7972c99   Zhao Yakui   x86: Add support ...
813
814
815
  config ACRN_GUEST
  	bool "ACRN Guest support"
  	depends on X86_64
498ad3936   Zhao Yakui   x86/acrn: Use HYP...
816
  	select X86_HV_CALLBACK_VECTOR
ec7972c99   Zhao Yakui   x86: Add support ...
817
818
819
820
821
822
  	help
  	  This option allows to run Linux as guest in the ACRN hypervisor. ACRN is
  	  a flexible, lightweight reference open-source hypervisor, built with
  	  real-time and safety-criticality in mind. It is built for embedded
  	  IOT with small footprint and real-time features. More details can be
  	  found in https://projectacrn.org/.
6276a074c   Borislav Petkov   x86: Make Linux g...
823
  endif #HYPERVISOR_GUEST
97349135f   Jeremy Fitzhardinge   x86/paravirt: add...
824

506f1d07b   Sam Ravnborg   x86: move the res...
825
826
827
  source "arch/x86/Kconfig.cpu"
  
  config HPET_TIMER
3c2362e62   Harvey Harrison   x86: use def_bool...
828
  	def_bool X86_64
506f1d07b   Sam Ravnborg   x86: move the res...
829
  	prompt "HPET Timer Support" if X86_32
a7f7f6248   Masahiro Yamada   treewide: replace...
830
  	help
8f9ca475c   Ingo Molnar   x86: clean up arc...
831
832
833
834
835
836
  	  Use the IA-PC HPET (High Precision Event Timer) to manage
  	  time in preference to the PIT and RTC, if a HPET is
  	  present.
  	  HPET is the next generation timer replacing legacy 8254s.
  	  The HPET provides a stable time base on SMP
  	  systems, unlike the TSC, but it is more expensive to access,
4e7f9df25   Michael S. Tsirkin   hpet: Drop stale ...
837
838
  	  as it is off-chip.  The interface used is documented
  	  in the HPET spec, revision 1.
506f1d07b   Sam Ravnborg   x86: move the res...
839

8f9ca475c   Ingo Molnar   x86: clean up arc...
840
841
842
  	  You can safely choose Y here.  However, HPET will only be
  	  activated if the platform and the BIOS support this feature.
  	  Otherwise the 8254 will be used for timing services.
506f1d07b   Sam Ravnborg   x86: move the res...
843

8f9ca475c   Ingo Molnar   x86: clean up arc...
844
  	  Choose N to continue using the legacy 8254 timer.
506f1d07b   Sam Ravnborg   x86: move the res...
845
846
  
  config HPET_EMULATE_RTC
3c2362e62   Harvey Harrison   x86: use def_bool...
847
  	def_bool y
9d8af78b0   Bernhard Walle   rtc: add HPET RTC...
848
  	depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
506f1d07b   Sam Ravnborg   x86: move the res...
849

bb24c4716   Jacob Pan   x86, apbt: Moores...
850
  config APB_TIMER
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
851
852
853
854
855
856
857
858
859
860
  	def_bool y if X86_INTEL_MID
  	prompt "Intel MID APB Timer Support" if X86_INTEL_MID
  	select DW_APB_TIMER
  	depends on X86_INTEL_MID && SFI
  	help
  	 APB timer is the replacement for 8254, HPET on X86 MID platforms.
  	 The APBT provides a stable time base on SMP
  	 systems, unlike the TSC, but it is more expensive to access,
  	 as it is off-chip. APB timers are always running regardless of CPU
  	 C states, they are used as per CPU clockevent device when possible.
bb24c4716   Jacob Pan   x86, apbt: Moores...
861

6a108a14f   David Rientjes   kconfig: rename C...
862
  # Mark as expert because too many people got it wrong.
506f1d07b   Sam Ravnborg   x86: move the res...
863
  # The code disables itself when not needed.
7ae9392c0   Thomas Petazzoni   x86: configurable...
864
865
  config DMI
  	default y
cf0744021   Ard Biesheuvel   firmware/dmi_scan...
866
  	select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
6a108a14f   David Rientjes   kconfig: rename C...
867
  	bool "Enable DMI scanning" if EXPERT
a7f7f6248   Masahiro Yamada   treewide: replace...
868
  	help
7ae9392c0   Thomas Petazzoni   x86: configurable...
869
870
871
872
  	  Enabled scanning of DMI to identify machine quirks. Say Y
  	  here unless you have verified that your setup is not
  	  affected by entries in the DMI blacklist. Required by PNP
  	  BIOS code.
506f1d07b   Sam Ravnborg   x86: move the res...
873
  config GART_IOMMU
38901f1c1   Andi Kleen   x86/iommu: Don't ...
874
  	bool "Old AMD GART IOMMU support"
2f9237d4f   Christoph Hellwig   dma-mapping: make...
875
  	select DMA_OPS
a4ce5a48d   Christoph Hellwig   iommu-helper: mov...
876
  	select IOMMU_HELPER
506f1d07b   Sam Ravnborg   x86: move the res...
877
  	select SWIOTLB
23ac4ae82   Andreas Herrmann   x86, k8: Rename k...
878
  	depends on X86_64 && PCI && AMD_NB
a7f7f6248   Masahiro Yamada   treewide: replace...
879
  	help
ced3c42c9   Ingo Molnar   x86/iommu: Clean ...
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
  	  Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
  	  GART based hardware IOMMUs.
  
  	  The GART supports full DMA access for devices with 32-bit access
  	  limitations, on systems with more than 3 GB. This is usually needed
  	  for USB, sound, many IDE/SATA chipsets and some other devices.
  
  	  Newer systems typically have a modern AMD IOMMU, supported via
  	  the CONFIG_AMD_IOMMU=y config option.
  
  	  In normal configurations this driver is only active when needed:
  	  there's more than 3 GB of memory and the system contains a
  	  32-bit limited device.
  
  	  If unsure, say Y.
506f1d07b   Sam Ravnborg   x86: move the res...
895

1184dc2ff   Mike Travis   x86: modify Kconf...
896
  config MAXSMP
ddb0c5a68   Samuel Thibault   Replace Configure...
897
  	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
6ea303864   Kees Cook   arch/x86: remove ...
898
  	depends on X86_64 && SMP && DEBUG_KERNEL
36f5101a6   Mike Travis   x86: enable MAXSMP
899
  	select CPUMASK_OFFSTACK
a7f7f6248   Masahiro Yamada   treewide: replace...
900
  	help
ddb0c5a68   Samuel Thibault   Replace Configure...
901
  	  Enable maximum number of CPUS and NUMA Nodes for this architecture.
1184dc2ff   Mike Travis   x86: modify Kconf...
902
  	  If unsure, say N.
506f1d07b   Sam Ravnborg   x86: move the res...
903

aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
  #
  # The maximum number of CPUs supported:
  #
  # The main config value is NR_CPUS, which defaults to NR_CPUS_DEFAULT,
  # and which can be configured interactively in the
  # [NR_CPUS_RANGE_BEGIN ... NR_CPUS_RANGE_END] range.
  #
  # The ranges are different on 32-bit and 64-bit kernels, depending on
  # hardware capabilities and scalability features of the kernel.
  #
  # ( If MAXSMP is enabled we just use the highest possible value and disable
  #   interactive configuration. )
  #
  
  config NR_CPUS_RANGE_BEGIN
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
919
  	int
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
920
921
922
  	default NR_CPUS_RANGE_END if MAXSMP
  	default    1 if !SMP
  	default    2
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
923

aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
924
  config NR_CPUS_RANGE_END
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
925
  	int
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
926
927
928
929
  	depends on X86_32
  	default   64 if  SMP &&  X86_BIGSMP
  	default    8 if  SMP && !X86_BIGSMP
  	default    1 if !SMP
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
930

aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
931
  config NR_CPUS_RANGE_END
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
932
  	int
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
933
  	depends on X86_64
1edae1ae6   Scott Wood   x86/Kconfig: Enfo...
934
935
  	default 8192 if  SMP && CPUMASK_OFFSTACK
  	default  512 if  SMP && !CPUMASK_OFFSTACK
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
936
  	default    1 if !SMP
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
937

aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
938
  config NR_CPUS_DEFAULT
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
939
940
  	int
  	depends on X86_32
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
941
942
943
  	default   32 if  X86_BIGSMP
  	default    8 if  SMP
  	default    1 if !SMP
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
944

aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
945
  config NR_CPUS_DEFAULT
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
946
947
  	int
  	depends on X86_64
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
948
949
950
  	default 8192 if  MAXSMP
  	default   64 if  SMP
  	default    1 if !SMP
a0d0bb4de   Randy Dunlap   x86/Kconfig: Simp...
951

506f1d07b   Sam Ravnborg   x86: move the res...
952
  config NR_CPUS
36f5101a6   Mike Travis   x86: enable MAXSMP
953
  	int "Maximum number of CPUs" if SMP && !MAXSMP
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
954
955
  	range NR_CPUS_RANGE_BEGIN NR_CPUS_RANGE_END
  	default NR_CPUS_DEFAULT
a7f7f6248   Masahiro Yamada   treewide: replace...
956
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
957
  	  This allows you to specify the maximum number of CPUs which this
bb61ccc7d   Josh Boyer   x86/cpu: Allow hi...
958
  	  kernel will support.  If CPUMASK_OFFSTACK is enabled, the maximum
cad14bb9f   Kirill A. Shutemov   x86/kconfig: Fix ...
959
  	  supported value is 8192, otherwise the maximum value is 512.  The
506f1d07b   Sam Ravnborg   x86: move the res...
960
  	  minimum value which makes sense is 2.
aec6487e9   Ingo Molnar   x86/Kconfig: Furt...
961
962
  	  This is purely to save memory: each supported CPU adds about 8KB
  	  to the kernel image.
506f1d07b   Sam Ravnborg   x86: move the res...
963
964
  
  config SCHED_SMT
dbe733642   Thomas Gleixner   x86/Kconfig: Sele...
965
  	def_bool y if SMP
506f1d07b   Sam Ravnborg   x86: move the res...
966
967
  
  config SCHED_MC
3c2362e62   Harvey Harrison   x86: use def_bool...
968
969
  	def_bool y
  	prompt "Multi-core scheduler support"
c8e56d20f   Borislav Petkov   x86: Kill CONFIG_...
970
  	depends on SMP
a7f7f6248   Masahiro Yamada   treewide: replace...
971
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
972
973
974
  	  Multi-core scheduler support improves the CPU scheduler's decision
  	  making when dealing with multi-core CPU chips at a cost of slightly
  	  increased overhead in some places. If unsure say N here.
de966cf4a   Tim Chen   sched/x86: Change...
975
976
  config SCHED_MC_PRIO
  	bool "CPU core priorities scheduler support"
0a21fc121   Ingo Molnar   sched/x86: Make C...
977
978
979
  	depends on SCHED_MC && CPU_SUP_INTEL
  	select X86_INTEL_PSTATE
  	select CPU_FREQ
de966cf4a   Tim Chen   sched/x86: Change...
980
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
981
  	help
0a21fc121   Ingo Molnar   sched/x86: Make C...
982
983
984
985
  	  Intel Turbo Boost Max Technology 3.0 enabled CPUs have a
  	  core ordering determined at manufacturing time, which allows
  	  certain cores to reach higher turbo frequencies (when running
  	  single threaded workloads) than others.
de966cf4a   Tim Chen   sched/x86: Change...
986

0a21fc121   Ingo Molnar   sched/x86: Make C...
987
988
989
990
  	  Enabling this kernel feature teaches the scheduler about
  	  the TBM3 (aka ITMT) priority order of the CPU cores and adjusts the
  	  scheduler's CPU selection logic accordingly, so that higher
  	  overall system performance can be achieved.
de966cf4a   Tim Chen   sched/x86: Change...
991

0a21fc121   Ingo Molnar   sched/x86: Make C...
992
  	  This feature will have no effect on CPUs without this feature.
de966cf4a   Tim Chen   sched/x86: Change...
993

0a21fc121   Ingo Molnar   sched/x86: Make C...
994
  	  If unsure say Y here.
5e76b2ab3   Tim Chen   x86: Enable Intel...
995

30b8b0066   Thomas Gleixner   init: Get rid of ...
996
  config UP_LATE_INIT
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
997
998
  	def_bool y
  	depends on !SMP && X86_LOCAL_APIC
30b8b0066   Thomas Gleixner   init: Get rid of ...
999

506f1d07b   Sam Ravnborg   x86: move the res...
1000
  config X86_UP_APIC
50849eefe   Jan Beulich   x86/Kconfig: Simp...
1001
1002
  	bool "Local APIC support on uniprocessors" if !PCI_MSI
  	default PCI_MSI
38a1dfda8   Bryan O'Donoghue   x86/apic: Re-enab...
1003
  	depends on X86_32 && !SMP && !X86_32_NON_STANDARD
a7f7f6248   Masahiro Yamada   treewide: replace...
1004
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
  	  A local APIC (Advanced Programmable Interrupt Controller) is an
  	  integrated interrupt controller in the CPU. If you have a single-CPU
  	  system which has a processor with a local APIC, you can say Y here to
  	  enable and use it. If you say Y here even though your machine doesn't
  	  have a local APIC, then the kernel will still run with no slowdown at
  	  all. The local APIC supports CPU-generated self-interrupts (timer,
  	  performance counters), and the NMI watchdog which detects hard
  	  lockups.
  
  config X86_UP_IOAPIC
  	bool "IO-APIC support on uniprocessors"
  	depends on X86_UP_APIC
a7f7f6248   Masahiro Yamada   treewide: replace...
1017
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1018
1019
1020
1021
1022
1023
1024
1025
1026
  	  An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  	  SMP-capable replacement for PC-style interrupt controllers. Most
  	  SMP systems and many recent uniprocessor systems have one.
  
  	  If you have a single-CPU system with an IO-APIC, you can say Y here
  	  to use it. If you say Y here even though your machine doesn't have
  	  an IO-APIC, then the kernel will still run with no slowdown at all.
  
  config X86_LOCAL_APIC
3c2362e62   Harvey Harrison   x86: use def_bool...
1027
  	def_bool y
0dbc6078c   Thomas Petazzoni   x86, build, pci: ...
1028
  	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
b5dc8e6c2   Jiang Liu   x86/irq: Use hier...
1029
  	select IRQ_DOMAIN_HIERARCHY
52f518a3a   Jiang Liu   x86/MSI: Use hier...
1030
  	select PCI_MSI_IRQ_DOMAIN if PCI_MSI
506f1d07b   Sam Ravnborg   x86: move the res...
1031
1032
  
  config X86_IO_APIC
b1da1e715   Jan Beulich   x86/Kconfig: Simp...
1033
1034
  	def_bool y
  	depends on X86_LOCAL_APIC || X86_UP_IOAPIC
506f1d07b   Sam Ravnborg   x86: move the res...
1035

41b9eb264   Stefan Assmann   x86, pci: introdu...
1036
1037
  config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  	bool "Reroute for broken boot IRQs"
41b9eb264   Stefan Assmann   x86, pci: introdu...
1038
  	depends on X86_IO_APIC
a7f7f6248   Masahiro Yamada   treewide: replace...
1039
  	help
41b9eb264   Stefan Assmann   x86, pci: introdu...
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
  	  This option enables a workaround that fixes a source of
  	  spurious interrupts. This is recommended when threaded
  	  interrupt handling is used on systems where the generation of
  	  superfluous "boot interrupts" cannot be disabled.
  
  	  Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  	  entry in the chipset's IO-APIC is masked (as, e.g. the RT
  	  kernel does during interrupt handling). On chipsets where this
  	  boot IRQ generation cannot be disabled, this workaround keeps
  	  the original IRQ line masked so that only the equivalent "boot
  	  IRQ" is delivered to the CPUs. The workaround also tells the
  	  kernel to set up the IRQ handler on the boot IRQ line. In this
  	  way only one interrupt is delivered to the kernel. Otherwise
  	  the spurious second interrupt may cause the kernel to bring
  	  down (vital) interrupt lines.
  
  	  Only affects "broken" chipsets. Interrupt sharing may be
  	  increased on these systems.
506f1d07b   Sam Ravnborg   x86: move the res...
1058
  config X86_MCE
bab9bc658   Andi Kleen   x86: mce: Update ...
1059
  	bool "Machine Check / overheating reporting"
648ed9403   Chen, Gong   x86/mce: Provide ...
1060
  	select GENERIC_ALLOCATOR
e57dbaf77   Borislav Petkov   x86, mce: Enable ...
1061
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
1062
  	help
bab9bc658   Andi Kleen   x86: mce: Update ...
1063
1064
  	  Machine Check support allows the processor to notify the
  	  kernel if it detects a problem (e.g. overheating, data corruption).
506f1d07b   Sam Ravnborg   x86: move the res...
1065
  	  The action the kernel takes depends on the severity of the problem,
bab9bc658   Andi Kleen   x86: mce: Update ...
1066
  	  ranging from warning messages to halting the machine.
4efc0670b   Andi Kleen   x86, mce: use 64b...
1067

5de97c9f6   Tony Luck   x86/mce: Factor o...
1068
1069
1070
  config X86_MCELOG_LEGACY
  	bool "Support for deprecated /dev/mcelog character device"
  	depends on X86_MCE
a7f7f6248   Masahiro Yamada   treewide: replace...
1071
  	help
5de97c9f6   Tony Luck   x86/mce: Factor o...
1072
1073
1074
  	  Enable support for /dev/mcelog which is needed by the old mcelog
  	  userspace logging daemon. Consider switching to the new generation
  	  rasdaemon solution.
506f1d07b   Sam Ravnborg   x86: move the res...
1075
  config X86_MCE_INTEL
3c2362e62   Harvey Harrison   x86: use def_bool...
1076
1077
  	def_bool y
  	prompt "Intel MCE features"
c1ebf8356   Andi Kleen   x86: mce: Rename ...
1078
  	depends on X86_MCE && X86_LOCAL_APIC
a7f7f6248   Masahiro Yamada   treewide: replace...
1079
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1080
1081
1082
1083
  	   Additional support for intel specific MCE features such as
  	   the thermal monitor.
  
  config X86_MCE_AMD
3c2362e62   Harvey Harrison   x86: use def_bool...
1084
1085
  	def_bool y
  	prompt "AMD MCE features"
f5382de9d   Yazen Ghannam   x86/mce/AMD: Add ...
1086
  	depends on X86_MCE && X86_LOCAL_APIC && AMD_NB
a7f7f6248   Masahiro Yamada   treewide: replace...
1087
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1088
1089
  	   Additional support for AMD specific MCE features such as
  	   the DRAM Error Threshold.
4efc0670b   Andi Kleen   x86, mce: use 64b...
1090
  config X86_ANCIENT_MCE
6fc108a08   Jan Beulich   x86: Clean up arc...
1091
  	bool "Support for old Pentium 5 / WinChip machine checks"
c31d96338   Andi Kleen   x86: mce: Make CO...
1092
  	depends on X86_32 && X86_MCE
a7f7f6248   Masahiro Yamada   treewide: replace...
1093
  	help
cd13adcc8   Hidetoshi Seto   x86: trivial clea...
1094
  	  Include support for machine check handling on old Pentium 5 or WinChip
5065a706c   Masanari Iida   treewide: Fix typ...
1095
  	  systems. These typically need to be enabled explicitly on the command
cd13adcc8   Hidetoshi Seto   x86: trivial clea...
1096
  	  line.
4efc0670b   Andi Kleen   x86, mce: use 64b...
1097

b27626863   Andi Kleen   x86, mce, cmci: f...
1098
1099
  config X86_MCE_THRESHOLD
  	depends on X86_MCE_AMD || X86_MCE_INTEL
6fc108a08   Jan Beulich   x86: Clean up arc...
1100
  	def_bool y
b27626863   Andi Kleen   x86, mce, cmci: f...
1101

ea149b36c   Andi Kleen   x86, mce: add bas...
1102
  config X86_MCE_INJECT
bc8e80d56   Borislav Petkov   x86/mce: Merge mc...
1103
  	depends on X86_MCE && X86_LOCAL_APIC && DEBUG_FS
ea149b36c   Andi Kleen   x86, mce: add bas...
1104
  	tristate "Machine check injector support"
a7f7f6248   Masahiro Yamada   treewide: replace...
1105
  	help
ea149b36c   Andi Kleen   x86, mce: add bas...
1106
1107
1108
  	  Provide support for injecting machine checks for testing purposes.
  	  If you don't know what a machine check is and you don't do kernel
  	  QA it is safe to say n.
4efc0670b   Andi Kleen   x86, mce: use 64b...
1109
1110
  config X86_THERMAL_VECTOR
  	def_bool y
5bb38adcb   Andi Kleen   x86: mce: Remove ...
1111
  	depends on X86_MCE_INTEL
4efc0670b   Andi Kleen   x86, mce: use 64b...
1112

07dc900e1   Peter Zijlstra   perf/x86: Move Kc...
1113
  source "arch/x86/events/Kconfig"
e633c65a1   Kan Liang   x86/perf/intel/un...
1114

5aef51c34   Andy Lutomirski   x86/kconfig/32: R...
1115
  config X86_LEGACY_VM86
1e6428124   Ingo Molnar   x86/vm86: Fix the...
1116
  	bool "Legacy VM86 support"
506f1d07b   Sam Ravnborg   x86: move the res...
1117
  	depends on X86_32
a7f7f6248   Masahiro Yamada   treewide: replace...
1118
  	help
5aef51c34   Andy Lutomirski   x86/kconfig/32: R...
1119
1120
1121
1122
1123
1124
1125
1126
  	  This option allows user programs to put the CPU into V8086
  	  mode, which is an 80286-era approximation of 16-bit real mode.
  
  	  Some very old versions of X and/or vbetool require this option
  	  for user mode setting.  Similarly, DOSEMU will use it if
  	  available to accelerate real mode DOS programs.  However, any
  	  recent version of DOSEMU, X, or vbetool should be fully
  	  functional even without kernel VM86 support, as they will all
1e6428124   Ingo Molnar   x86/vm86: Fix the...
1127
1128
1129
1130
  	  fall back to software emulation. Nevertheless, if you are using
  	  a 16-bit DOS program where 16-bit performance matters, vm86
  	  mode might be faster than emulation and you might want to
  	  enable this option.
5aef51c34   Andy Lutomirski   x86/kconfig/32: R...
1131

1e6428124   Ingo Molnar   x86/vm86: Fix the...
1132
1133
1134
1135
  	  Note that any app that works on a 64-bit kernel is unlikely to
  	  need this option, as 64-bit kernels don't, and can't, support
  	  V8086 mode. This option is also unrelated to 16-bit protected
  	  mode and is not needed to run most 16-bit programs under Wine.
5aef51c34   Andy Lutomirski   x86/kconfig/32: R...
1136

1e6428124   Ingo Molnar   x86/vm86: Fix the...
1137
1138
  	  Enabling this option increases the complexity of the kernel
  	  and slows down exception handling a tiny bit.
5aef51c34   Andy Lutomirski   x86/kconfig/32: R...
1139

1e6428124   Ingo Molnar   x86/vm86: Fix the...
1140
  	  If unsure, say N here.
5aef51c34   Andy Lutomirski   x86/kconfig/32: R...
1141
1142
  
  config VM86
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
1143
1144
  	bool
  	default X86_LEGACY_VM86
34273f41d   H. Peter Anvin   x86, espfix: Make...
1145
1146
1147
1148
  
  config X86_16BIT
  	bool "Enable support for 16-bit segments" if EXPERT
  	default y
a5b9e5a2f   Andy Lutomirski   x86/ldt: Make mod...
1149
  	depends on MODIFY_LDT_SYSCALL
a7f7f6248   Masahiro Yamada   treewide: replace...
1150
  	help
34273f41d   H. Peter Anvin   x86, espfix: Make...
1151
1152
1153
1154
1155
1156
1157
1158
  	  This option is required by programs like Wine to run 16-bit
  	  protected mode legacy code on x86 processors.  Disabling
  	  this option saves about 300 bytes on i386, or around 6K text
  	  plus 16K runtime memory on x86-64,
  
  config X86_ESPFIX32
  	def_bool y
  	depends on X86_16BIT && X86_32
506f1d07b   Sam Ravnborg   x86: move the res...
1159

197725de6   H. Peter Anvin   x86, espfix: Make...
1160
1161
  config X86_ESPFIX64
  	def_bool y
34273f41d   H. Peter Anvin   x86, espfix: Make...
1162
  	depends on X86_16BIT && X86_64
506f1d07b   Sam Ravnborg   x86: move the res...
1163

1ad83c858   Andy Lutomirski   x86_64,vsyscall: ...
1164
  config X86_VSYSCALL_EMULATION
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
1165
1166
1167
  	bool "Enable vsyscall emulation" if EXPERT
  	default y
  	depends on X86_64
a7f7f6248   Masahiro Yamada   treewide: replace...
1168
  	help
1ad83c858   Andy Lutomirski   x86_64,vsyscall: ...
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
  	 This enables emulation of the legacy vsyscall page.  Disabling
  	 it is roughly equivalent to booting with vsyscall=none, except
  	 that it will also disable the helpful warning if a program
  	 tries to use a vsyscall.  With this option set to N, offending
  	 programs will just segfault, citing addresses of the form
  	 0xffffffffff600?00.
  
  	 This option is required by many programs built before 2013, and
  	 care should be used even with newer programs if set to N.
  
  	 Disabling this option saves about 7K of kernel size and
  	 possibly 4K of additional runtime pagetable memory.
111e7b15c   Thomas Gleixner   x86/ioperm: Exten...
1181
1182
  config X86_IOPL_IOPERM
  	bool "IOPERM and IOPL Emulation"
a24ca9976   Thomas Gleixner   x86/iopl: Remove ...
1183
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
1184
  	help
111e7b15c   Thomas Gleixner   x86/ioperm: Exten...
1185
1186
  	  This enables the ioperm() and iopl() syscalls which are necessary
  	  for legacy applications.
c8137ace5   Thomas Gleixner   x86/iopl: Restric...
1187
1188
1189
1190
1191
1192
1193
1194
  	  Legacy IOPL support is an overbroad mechanism which allows user
  	  space aside of accessing all 65536 I/O ports also to disable
  	  interrupts. To gain this access the caller needs CAP_SYS_RAWIO
  	  capabilities and permission from potentially active security
  	  modules.
  
  	  The emulation restricts the functionality of the syscall to
  	  only allowing the full range I/O port access, but prevents the
a24ca9976   Thomas Gleixner   x86/iopl: Remove ...
1195
1196
  	  ability to disable interrupts from user space which would be
  	  granted if the hardware IOPL mechanism would be used.
c8137ace5   Thomas Gleixner   x86/iopl: Restric...
1197

506f1d07b   Sam Ravnborg   x86: move the res...
1198
1199
1200
  config TOSHIBA
  	tristate "Toshiba Laptop support"
  	depends on X86_32
a7f7f6248   Masahiro Yamada   treewide: replace...
1201
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
  	  This adds a driver to safely access the System Management Mode of
  	  the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  	  not work on models with a Phoenix BIOS. The System Management Mode
  	  is used to set the BIOS and power saving options on Toshiba portables.
  
  	  For information on utilities to make use of this driver see the
  	  Toshiba Linux utilities web site at:
  	  <http://www.buzzard.org.uk/toshiba/>.
  
  	  Say Y if you intend to run this kernel on a Toshiba portable.
  	  Say N otherwise.
  
  config I8K
039ae5850   Pali Rohár   hwmon: Allow to c...
1215
  	tristate "Dell i8k legacy laptop support"
949a9d700   Jean Delvare   i8k: Integrate wi...
1216
  	select HWMON
039ae5850   Pali Rohár   hwmon: Allow to c...
1217
  	select SENSORS_DELL_SMM
a7f7f6248   Masahiro Yamada   treewide: replace...
1218
  	help
039ae5850   Pali Rohár   hwmon: Allow to c...
1219
1220
1221
1222
1223
1224
1225
1226
1227
  	  This option enables legacy /proc/i8k userspace interface in hwmon
  	  dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
  	  temperature and allows controlling fan speeds of Dell laptops via
  	  System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
  	  it reports also power and hotkey status. For fan speed control is
  	  needed userspace package i8kutils.
  
  	  Say Y if you intend to run this kernel on old Dell laptops or want to
  	  use userspace package i8kutils.
506f1d07b   Sam Ravnborg   x86: move the res...
1228
1229
1230
  	  Say N otherwise.
  
  config X86_REBOOTFIXUPS
9ba16087d   Jan Beulich   Kconfig: eliminat...
1231
1232
  	bool "Enable X86 board specific fixups for reboot"
  	depends on X86_32
a7f7f6248   Masahiro Yamada   treewide: replace...
1233
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1234
1235
1236
1237
1238
1239
1240
  	  This enables chipset and/or board specific fixups to be done
  	  in order to get reboot to work correctly. This is only needed on
  	  some combinations of hardware and BIOS. The symptom, for which
  	  this config is intended, is when reboot ends with a stalled/hung
  	  system.
  
  	  Currently, the only fixup is for the Geode machines using
5e3a77e9a   Florian Fainelli   x86: add support ...
1241
  	  CS5530A and CS5536 chipsets and the RDC R-321x SoC.
506f1d07b   Sam Ravnborg   x86: move the res...
1242
1243
1244
1245
1246
1247
  
  	  Say Y if you want to enable the fixup. Currently, it's safe to
  	  enable this option even if you don't need it.
  	  Say N otherwise.
  
  config MICROCODE
9a2bc335f   Borislav Petkov   x86/microcode: Un...
1248
1249
  	bool "CPU microcode loading support"
  	default y
80030e3d8   Borislav Petkov   x86/microcode: Co...
1250
  	depends on CPU_SUP_AMD || CPU_SUP_INTEL
a7f7f6248   Masahiro Yamada   treewide: replace...
1251
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1252
  	  If you say Y here, you will be able to update the microcode on
5f9c01aa7   Borislav Petkov   x86/microcode: Un...
1253
1254
1255
1256
1257
1258
1259
  	  Intel and AMD processors. The Intel support is for the IA32 family,
  	  e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The
  	  AMD support is for families 0x10 and later. You will obviously need
  	  the actual microcode binary data itself which is not shipped with
  	  the Linux kernel.
  
  	  The preferred method to load microcode from a detached initrd is described
cb1aaebea   Mauro Carvalho Chehab   docs: fix broken ...
1260
  	  in Documentation/x86/microcode.rst. For that you need to enable
5f9c01aa7   Borislav Petkov   x86/microcode: Un...
1261
1262
  	  CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the
  	  initrd for microcode blobs.
c508c46e6   Benjamin Gilbert   firmware: Fix up ...
1263
1264
1265
  	  In addition, you can build the microcode into the kernel. For that you
  	  need to add the vendor-supplied microcode to the CONFIG_EXTRA_FIRMWARE
  	  config option.
506f1d07b   Sam Ravnborg   x86: move the res...
1266

8d86f390d   Peter Oruba   x86: major refact...
1267
  config MICROCODE_INTEL
e43f6e67e   Borislav Petkov   x86, microcode: S...
1268
  	bool "Intel microcode loading support"
8f9ca475c   Ingo Molnar   x86: clean up arc...
1269
1270
  	depends on MICROCODE
  	default MICROCODE
a7f7f6248   Masahiro Yamada   treewide: replace...
1271
  	help
8f9ca475c   Ingo Molnar   x86: clean up arc...
1272
1273
  	  This options enables microcode patch loading support for Intel
  	  processors.
b8989db9d   Alan   x86, doc, kconfig...
1274
1275
1276
  	  For the current Intel microcode data package go to
  	  <https://downloadcenter.intel.com> and search for
  	  'Linux Processor Microcode Data File'.
8d86f390d   Peter Oruba   x86: major refact...
1277

80cc9f102   Peter Oruba   x86: AMD microcod...
1278
  config MICROCODE_AMD
e43f6e67e   Borislav Petkov   x86, microcode: S...
1279
  	bool "AMD microcode loading support"
8f9ca475c   Ingo Molnar   x86: clean up arc...
1280
  	depends on MICROCODE
a7f7f6248   Masahiro Yamada   treewide: replace...
1281
  	help
8f9ca475c   Ingo Molnar   x86: clean up arc...
1282
1283
  	  If you select this option, microcode patch loading support for AMD
  	  processors will be enabled.
80cc9f102   Peter Oruba   x86: AMD microcod...
1284

8f9ca475c   Ingo Molnar   x86: clean up arc...
1285
  config MICROCODE_OLD_INTERFACE
c02f48e07   Borislav Petkov   x86/microcode: De...
1286
1287
  	bool "Ancient loading interface (DEPRECATED)"
  	default n
506f1d07b   Sam Ravnborg   x86: move the res...
1288
  	depends on MICROCODE
a7f7f6248   Masahiro Yamada   treewide: replace...
1289
  	help
c02f48e07   Borislav Petkov   x86/microcode: De...
1290
1291
1292
1293
1294
  	  DO NOT USE THIS! This is the ancient /dev/cpu/microcode interface
  	  which was used by userspace tools like iucode_tool and microcode.ctl.
  	  It is inadequate because it runs too late to be able to properly
  	  load microcode on a machine and it needs special tools. Instead, you
  	  should've switched to the early loading method with the initrd or
cb1aaebea   Mauro Carvalho Chehab   docs: fix broken ...
1295
  	  builtin microcode by now: Documentation/x86/microcode.rst
506f1d07b   Sam Ravnborg   x86: move the res...
1296
1297
1298
  
  config X86_MSR
  	tristate "/dev/cpu/*/msr - Model-specific register support"
a7f7f6248   Masahiro Yamada   treewide: replace...
1299
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1300
1301
1302
1303
1304
1305
1306
1307
  	  This device gives privileged processes access to the x86
  	  Model-Specific Registers (MSRs).  It is a character device with
  	  major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  	  MSR accesses are directed to a specific CPU on multi-processor
  	  systems.
  
  config X86_CPUID
  	tristate "/dev/cpu/*/cpuid - CPU information support"
a7f7f6248   Masahiro Yamada   treewide: replace...
1308
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1309
1310
1311
1312
1313
1314
1315
  	  This device gives processes access to the x86 CPUID instruction to
  	  be executed on a specific processor.  It is a character device
  	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  	  /dev/cpu/31/cpuid.
  
  choice
  	prompt "High Memory Support"
6fc108a08   Jan Beulich   x86: Clean up arc...
1316
  	default HIGHMEM4G
506f1d07b   Sam Ravnborg   x86: move the res...
1317
1318
1319
1320
  	depends on X86_32
  
  config NOHIGHMEM
  	bool "off"
a7f7f6248   Masahiro Yamada   treewide: replace...
1321
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
  	  Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  	  However, the address space of 32-bit x86 processors is only 4
  	  Gigabytes large. That means that, if you have a large amount of
  	  physical memory, not all of it can be "permanently mapped" by the
  	  kernel. The physical memory that's not permanently mapped is called
  	  "high memory".
  
  	  If you are compiling a kernel which will never run on a machine with
  	  more than 1 Gigabyte total physical RAM, answer "off" here (default
  	  choice and suitable for most users). This will result in a "3GB/1GB"
  	  split: 3GB are mapped so that each process sees a 3GB virtual memory
  	  space and the remaining part of the 4GB virtual memory space is used
  	  by the kernel to permanently map as much physical memory as
  	  possible.
  
  	  If the machine has between 1 and 4 Gigabytes physical RAM, then
  	  answer "4GB" here.
  
  	  If more than 4 Gigabytes is used then answer "64GB" here. This
  	  selection turns Intel PAE (Physical Address Extension) mode on.
  	  PAE implements 3-level paging on IA32 processors. PAE is fully
  	  supported by Linux, PAE mode is implemented on all recent Intel
  	  processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  	  then the kernel will not boot on CPUs that don't support PAE!
  
  	  The actual amount of total physical memory will either be
  	  auto detected or can be forced by using a kernel command line option
  	  such as "mem=256M". (Try "man bootparam" or see the documentation of
  	  your boot loader (lilo or loadlin) about how to pass options to the
  	  kernel at boot time.)
  
  	  If unsure, say "off".
  
  config HIGHMEM4G
  	bool "4GB"
a7f7f6248   Masahiro Yamada   treewide: replace...
1357
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1358
1359
1360
1361
1362
  	  Select this if you have a 32-bit processor and between 1 and 4
  	  gigabytes of physical RAM.
  
  config HIGHMEM64G
  	bool "64GB"
69b8d3fca   Matthew Whitehead   x86/Kconfig: Excl...
1363
  	depends on !M486 && !M586 && !M586TSC && !M586MMX && !MGEODE_LX && !MGEODEGX1 && !MCYRIXIII && !MELAN && !MWINCHIPC6 && !WINCHIP3D && !MK6
506f1d07b   Sam Ravnborg   x86: move the res...
1364
  	select X86_PAE
a7f7f6248   Masahiro Yamada   treewide: replace...
1365
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1366
1367
1368
1369
1370
1371
  	  Select this if you have a 32-bit processor and more than 4
  	  gigabytes of physical RAM.
  
  endchoice
  
  choice
6a108a14f   David Rientjes   kconfig: rename C...
1372
  	prompt "Memory split" if EXPERT
506f1d07b   Sam Ravnborg   x86: move the res...
1373
1374
  	default VMSPLIT_3G
  	depends on X86_32
a7f7f6248   Masahiro Yamada   treewide: replace...
1375
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
  	  Select the desired split between kernel and user memory.
  
  	  If the address range available to the kernel is less than the
  	  physical memory installed, the remaining memory will be available
  	  as "high memory". Accessing high memory is a little more costly
  	  than low memory, as it needs to be mapped into the kernel first.
  	  Note that increasing the kernel address space limits the range
  	  available to user programs, making the address space there
  	  tighter.  Selecting anything other than the default 3G/1G split
  	  will also likely make your kernel incompatible with binary-only
  	  kernel modules.
  
  	  If you are not absolutely sure what you are doing, leave this
  	  option alone!
  
  	config VMSPLIT_3G
  		bool "3G/1G user/kernel split"
  	config VMSPLIT_3G_OPT
  		depends on !X86_PAE
  		bool "3G/1G user/kernel split (for full 1G low memory)"
  	config VMSPLIT_2G
  		bool "2G/2G user/kernel split"
  	config VMSPLIT_2G_OPT
  		depends on !X86_PAE
  		bool "2G/2G user/kernel split (for full 2G low memory)"
  	config VMSPLIT_1G
  		bool "1G/3G user/kernel split"
  endchoice
  
  config PAGE_OFFSET
  	hex
  	default 0xB0000000 if VMSPLIT_3G_OPT
  	default 0x80000000 if VMSPLIT_2G
  	default 0x78000000 if VMSPLIT_2G_OPT
  	default 0x40000000 if VMSPLIT_1G
  	default 0xC0000000
  	depends on X86_32
  
  config HIGHMEM
3c2362e62   Harvey Harrison   x86: use def_bool...
1415
  	def_bool y
506f1d07b   Sam Ravnborg   x86: move the res...
1416
  	depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
506f1d07b   Sam Ravnborg   x86: move the res...
1417
1418
  
  config X86_PAE
9ba16087d   Jan Beulich   Kconfig: eliminat...
1419
  	bool "PAE (Physical Address Extension) Support"
506f1d07b   Sam Ravnborg   x86: move the res...
1420
  	depends on X86_32 && !HIGHMEM4G
d4a451d5f   Christoph Hellwig   arch: remove the ...
1421
  	select PHYS_ADDR_T_64BIT
9d99c7123   Christian Melki   swiotlb: Enable i...
1422
  	select SWIOTLB
a7f7f6248   Masahiro Yamada   treewide: replace...
1423
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1424
1425
1426
1427
  	  PAE is required for NX support, and furthermore enables
  	  larger swapspace support for non-overcommit purposes. It
  	  has the cost of more pagetable lookup overhead, and also
  	  consumes more pagetable space per process.
77ef56e4f   Kirill A. Shutemov   x86: Enable 5-lev...
1428
1429
  config X86_5LEVEL
  	bool "Enable 5-level page tables support"
18ec1eaf5   Kirill A. Shutemov   x86/mm: Enable 5-...
1430
  	default y
eedb92abb   Kirill A. Shutemov   x86/mm: Make virt...
1431
  	select DYNAMIC_MEMORY_LAYOUT
162434e7f   Kirill A. Shutemov   x86/mm: Make MAX_...
1432
  	select SPARSEMEM_VMEMMAP
77ef56e4f   Kirill A. Shutemov   x86: Enable 5-lev...
1433
  	depends on X86_64
a7f7f6248   Masahiro Yamada   treewide: replace...
1434
  	help
77ef56e4f   Kirill A. Shutemov   x86: Enable 5-lev...
1435
1436
1437
1438
1439
  	  5-level paging enables access to larger address space:
  	  upto 128 PiB of virtual address space and 4 PiB of
  	  physical address space.
  
  	  It will be supported by future Intel CPUs.
6657fca06   Kirill A. Shutemov   x86/mm: Allow to ...
1440
1441
  	  A kernel with the option enabled can be booted on machines that
  	  support 4- or 5-level paging.
77ef56e4f   Kirill A. Shutemov   x86: Enable 5-lev...
1442

cb1aaebea   Mauro Carvalho Chehab   docs: fix broken ...
1443
  	  See Documentation/x86/x86_64/5level-paging.rst for more
77ef56e4f   Kirill A. Shutemov   x86: Enable 5-lev...
1444
1445
1446
  	  information.
  
  	  Say N if unsure.
10971ab26   Ingo Molnar   x86/mm: Further s...
1447
  config X86_DIRECT_GBPAGES
e5008abe9   Luis R. Rodriguez   x86/mm: Simplify ...
1448
  	def_bool y
2e1da13fb   Vlastimil Babka   x86/kconfig: Remo...
1449
  	depends on X86_64
a7f7f6248   Masahiro Yamada   treewide: replace...
1450
  	help
10971ab26   Ingo Molnar   x86/mm: Further s...
1451
1452
1453
1454
  	  Certain kernel features effectively disable kernel
  	  linear 1 GB mappings (even if the CPU otherwise
  	  supports them), so don't confuse the user by printing
  	  that we have them enabled.
9e899816d   Nick Piggin   x86, mm: enable G...
1455

5c280cf60   Thomas Gleixner   x86/mm/cpa: Add l...
1456
1457
1458
  config X86_CPA_STATISTICS
  	bool "Enable statistic for Change Page Attribute"
  	depends on DEBUG_FS
a7f7f6248   Masahiro Yamada   treewide: replace...
1459
  	help
b75baaf3a   Ingo Molnar   x86/mm/pat: Fix t...
1460
  	  Expose statistics about the Change Page Attribute mechanism, which
a943245ad   Colin Ian King   x86/Kconfig: Fix ...
1461
  	  helps to determine the effectiveness of preserving large and huge
5c280cf60   Thomas Gleixner   x86/mm/cpa: Add l...
1462
  	  page mappings when mapping protections are changed.
7744ccdbc   Tom Lendacky   x86/mm: Add Secur...
1463
1464
1465
  config AMD_MEM_ENCRYPT
  	bool "AMD Secure Memory Encryption (SME) support"
  	depends on X86_64 && CPU_SUP_AMD
82fef0ad8   David Rientjes   x86/mm: unencrypt...
1466
  	select DMA_COHERENT_POOL
94d49eb30   Kirill A. Shutemov   x86/mm: Decouple ...
1467
  	select DYNAMIC_PHYSICAL_MASK
ce9084ba0   Ard Biesheuvel   x86: Make ARCH_US...
1468
  	select ARCH_USE_MEMREMAP_PROT
9087c3758   Tom Lendacky   dma-direct: Force...
1469
  	select ARCH_HAS_FORCE_DMA_UNENCRYPTED
597cfe482   Joerg Roedel   x86/boot/compress...
1470
  	select INSTRUCTION_DECODER
a7f7f6248   Masahiro Yamada   treewide: replace...
1471
  	help
7744ccdbc   Tom Lendacky   x86/mm: Add Secur...
1472
1473
1474
1475
1476
1477
1478
1479
  	  Say yes to enable support for the encryption of system memory.
  	  This requires an AMD processor that supports Secure Memory
  	  Encryption (SME).
  
  config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT
  	bool "Activate AMD Secure Memory Encryption (SME) by default"
  	default y
  	depends on AMD_MEM_ENCRYPT
a7f7f6248   Masahiro Yamada   treewide: replace...
1480
  	help
7744ccdbc   Tom Lendacky   x86/mm: Add Secur...
1481
1482
1483
1484
1485
1486
1487
1488
  	  Say yes to have system memory encrypted by default if running on
  	  an AMD processor that supports Secure Memory Encryption (SME).
  
  	  If set to Y, then the encryption of system memory can be
  	  deactivated with the mem_encrypt=off command line option.
  
  	  If set to N, then the encryption of system memory can be
  	  activated with the mem_encrypt=on command line option.
506f1d07b   Sam Ravnborg   x86: move the res...
1489
1490
  # Common NUMA Features
  config NUMA
e133f6eac   Randy Dunlap   x86/Kconfig: Corr...
1491
  	bool "NUMA Memory Allocation and Scheduler Support"
506f1d07b   Sam Ravnborg   x86: move the res...
1492
  	depends on SMP
b5660ba76   H. Peter Anvin   x86, platforms: R...
1493
1494
  	depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
  	default y if X86_BIGSMP
a7f7f6248   Masahiro Yamada   treewide: replace...
1495
  	help
e133f6eac   Randy Dunlap   x86/Kconfig: Corr...
1496
  	  Enable NUMA (Non-Uniform Memory Access) support.
fd51b2d7d   KOSAKI Motohiro   x86: update CONFI...
1497

506f1d07b   Sam Ravnborg   x86: move the res...
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  	  The kernel will try to allocate memory used by a CPU on the
  	  local memory controller of the CPU and add some more
  	  NUMA awareness to the kernel.
c280ea5e4   Ingo Molnar   x86: fix document...
1501
  	  For 64-bit this is recommended if the system is Intel Core i7
fd51b2d7d   KOSAKI Motohiro   x86: update CONFI...
1502
  	  (or later), AMD Opteron, or EM64T NUMA.
b5660ba76   H. Peter Anvin   x86, platforms: R...
1503
  	  For 32-bit this is only needed if you boot a 32-bit
7cf6c9459   David Rientjes   x86, apic: Remove...
1504
  	  kernel on a 64-bit NUMA platform.
fd51b2d7d   KOSAKI Motohiro   x86: update CONFI...
1505
1506
  
  	  Otherwise, you should say N.
506f1d07b   Sam Ravnborg   x86: move the res...
1507

eec1d4fa0   Hans Rosenfeld   x86, amd-nb: Comp...
1508
  config AMD_NUMA
3c2362e62   Harvey Harrison   x86: use def_bool...
1509
1510
  	def_bool y
  	prompt "Old style AMD Opteron NUMA detection"
5da0ef9a8   Tejun Heo   x86: Disable AMD_...
1511
  	depends on X86_64 && NUMA && PCI
a7f7f6248   Masahiro Yamada   treewide: replace...
1512
  	help
eec1d4fa0   Hans Rosenfeld   x86, amd-nb: Comp...
1513
1514
1515
1516
1517
  	  Enable AMD NUMA node topology detection.  You should say Y here if
  	  you have a multi processor AMD system. This uses an old method to
  	  read the NUMA configuration directly from the builtin Northbridge
  	  of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
  	  which also takes priority if both are compiled in.
506f1d07b   Sam Ravnborg   x86: move the res...
1518
1519
  
  config X86_64_ACPI_NUMA
3c2362e62   Harvey Harrison   x86: use def_bool...
1520
1521
  	def_bool y
  	prompt "ACPI NUMA detection"
506f1d07b   Sam Ravnborg   x86: move the res...
1522
1523
  	depends on X86_64 && NUMA && ACPI && PCI
  	select ACPI_NUMA
a7f7f6248   Masahiro Yamada   treewide: replace...
1524
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1525
1526
1527
1528
  	  Enable ACPI SRAT based node topology detection.
  
  config NUMA_EMU
  	bool "NUMA emulation"
1b7e03ef7   Tejun Heo   x86, NUMA: Enable...
1529
  	depends on NUMA
a7f7f6248   Masahiro Yamada   treewide: replace...
1530
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1531
1532
1533
1534
1535
  	  Enable NUMA emulation. A flat machine will be split
  	  into virtual nodes when booted with "numa=fake=N", where N is the
  	  number of nodes. This is only useful for debugging.
  
  config NODES_SHIFT
d25e26b61   Linus Torvalds   [x86] Clean up MA...
1536
  	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
51591e31d   David Rientjes   x86: Increase CON...
1537
1538
  	range 1 10
  	default "10" if MAXSMP
506f1d07b   Sam Ravnborg   x86: move the res...
1539
  	default "6" if X86_64
506f1d07b   Sam Ravnborg   x86: move the res...
1540
1541
  	default "3"
  	depends on NEED_MULTIPLE_NODES
a7f7f6248   Masahiro Yamada   treewide: replace...
1542
  	help
1184dc2ff   Mike Travis   x86: modify Kconf...
1543
  	  Specify the maximum number of NUMA Nodes available on the target
692105b8a   Matt LaPlante   trivial: fix typo...
1544
  	  system.  Increases memory reserved to accommodate various tables.
506f1d07b   Sam Ravnborg   x86: move the res...
1545

506f1d07b   Sam Ravnborg   x86: move the res...
1546
1547
  config ARCH_FLATMEM_ENABLE
  	def_bool y
3b16651f8   Tejun Heo   x86: Clean up mem...
1548
  	depends on X86_32 && !NUMA
506f1d07b   Sam Ravnborg   x86: move the res...
1549

506f1d07b   Sam Ravnborg   x86: move the res...
1550
1551
  config ARCH_SPARSEMEM_ENABLE
  	def_bool y
6ea303864   Kees Cook   arch/x86: remove ...
1552
  	depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
506f1d07b   Sam Ravnborg   x86: move the res...
1553
1554
  	select SPARSEMEM_STATIC if X86_32
  	select SPARSEMEM_VMEMMAP_ENABLE if X86_64
3b16651f8   Tejun Heo   x86: Clean up mem...
1555
  config ARCH_SPARSEMEM_DEFAULT
6ad57f7f2   Mike Rapoport   x86/Kconfig: Make...
1556
  	def_bool X86_64 || (NUMA && X86_32)
3b16651f8   Tejun Heo   x86: Clean up mem...
1557

506f1d07b   Sam Ravnborg   x86: move the res...
1558
1559
  config ARCH_SELECT_MEMORY_MODEL
  	def_bool y
b263295db   Christoph Lameter   x86: 64-bit, make...
1560
  	depends on ARCH_SPARSEMEM_ENABLE
506f1d07b   Sam Ravnborg   x86: move the res...
1561
1562
  
  config ARCH_MEMORY_PROBE
a0842b704   Toshi Kani   mm/hotplug, x86: ...
1563
  	bool "Enable sysfs memory/probe interface"
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
1564
  	depends on X86_64 && MEMORY_HOTPLUG
a0842b704   Toshi Kani   mm/hotplug, x86: ...
1565
1566
  	help
  	  This option enables a sysfs memory/probe interface for testing.
cb1aaebea   Mauro Carvalho Chehab   docs: fix broken ...
1567
  	  See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
a0842b704   Toshi Kani   mm/hotplug, x86: ...
1568
  	  If you are unsure how to answer this question, answer N.
506f1d07b   Sam Ravnborg   x86: move the res...
1569

3b16651f8   Tejun Heo   x86: Clean up mem...
1570
1571
1572
  config ARCH_PROC_KCORE_TEXT
  	def_bool y
  	depends on X86_64 && PROC_KCORE
a29815a33   Avi Kivity   core, x86: make L...
1573
  config ILLEGAL_POINTER_VALUE
b03b016fe   Krzysztof Kozlowski   x86/Kconfig: Fix ...
1574
1575
1576
  	hex
  	default 0 if X86_32
  	default 0xdead000000000000 if X86_64
a29815a33   Avi Kivity   core, x86: make L...
1577

7a67832c7   Dan Williams   libnvdimm, e820: ...
1578
1579
  config X86_PMEM_LEGACY_DEVICE
  	bool
ec776ef6b   Christoph Hellwig   x86/mm: Add suppo...
1580
  config X86_PMEM_LEGACY
7a67832c7   Dan Williams   libnvdimm, e820: ...
1581
  	tristate "Support non-standard NVDIMMs and ADR protected memory"
9f53f9fa4   Dan Williams   libnvdimm, pmem: ...
1582
1583
  	depends on PHYS_ADDR_T_64BIT
  	depends on BLK_DEV
7a67832c7   Dan Williams   libnvdimm, e820: ...
1584
  	select X86_PMEM_LEGACY_DEVICE
7b27a8622   Dan Williams   libnvdimm/e820: R...
1585
  	select NUMA_KEEP_MEMINFO if NUMA
9f53f9fa4   Dan Williams   libnvdimm, pmem: ...
1586
  	select LIBNVDIMM
ec776ef6b   Christoph Hellwig   x86/mm: Add suppo...
1587
1588
1589
1590
1591
1592
1593
  	help
  	  Treat memory marked using the non-standard e820 type of 12 as used
  	  by the Intel Sandy Bridge-EP reference BIOS as protected memory.
  	  The kernel will offer these regions to the 'pmem' driver so
  	  they can be used for persistent storage.
  
  	  Say Y if unsure.
506f1d07b   Sam Ravnborg   x86: move the res...
1594
1595
  config HIGHPTE
  	bool "Allocate 3rd-level pagetables from highmem"
6fc108a08   Jan Beulich   x86: Clean up arc...
1596
  	depends on HIGHMEM
a7f7f6248   Masahiro Yamada   treewide: replace...
1597
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1598
1599
1600
1601
  	  The VM uses one page table entry for each page of physical memory.
  	  For systems with a lot of RAM, this can be wasteful of precious
  	  low memory.  Setting this option will put user-space page table
  	  entries in high memory.
9f077871c   Jeremy Fitzhardinge   x86: clean up mem...
1602
  config X86_CHECK_BIOS_CORRUPTION
8f9ca475c   Ingo Molnar   x86: clean up arc...
1603
  	bool "Check for low memory corruption"
a7f7f6248   Masahiro Yamada   treewide: replace...
1604
  	help
8f9ca475c   Ingo Molnar   x86: clean up arc...
1605
1606
1607
1608
1609
1610
1611
  	  Periodically check for memory corruption in low memory, which
  	  is suspected to be caused by BIOS.  Even when enabled in the
  	  configuration, it is disabled at runtime.  Enable it by
  	  setting "memory_corruption_check=1" on the kernel command
  	  line.  By default it scans the low 64k of memory every 60
  	  seconds; see the memory_corruption_check_size and
  	  memory_corruption_check_period parameters in
8c27ceff3   Mauro Carvalho Chehab   docs: fix locatio...
1612
  	  Documentation/admin-guide/kernel-parameters.rst to adjust this.
8f9ca475c   Ingo Molnar   x86: clean up arc...
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
  
  	  When enabled with the default parameters, this option has
  	  almost no overhead, as it reserves a relatively small amount
  	  of memory and scans it infrequently.  It both detects corruption
  	  and prevents it from affecting the running system.
  
  	  It is, however, intended as a diagnostic tool; if repeatable
  	  BIOS-originated corruption always affects the same memory,
  	  you can use memmap= to prevent the kernel from using that
  	  memory.
9f077871c   Jeremy Fitzhardinge   x86: clean up mem...
1623

c885df50f   Jeremy Fitzhardinge   x86: default corr...
1624
  config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
8f9ca475c   Ingo Molnar   x86: clean up arc...
1625
  	bool "Set the default setting of memory_corruption_check"
c885df50f   Jeremy Fitzhardinge   x86: default corr...
1626
1627
  	depends on X86_CHECK_BIOS_CORRUPTION
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
1628
  	help
8f9ca475c   Ingo Molnar   x86: clean up arc...
1629
1630
  	  Set whether the default state of memory_corruption_check is
  	  on or off.
c885df50f   Jeremy Fitzhardinge   x86: default corr...
1631

9ea77bdb3   H. Peter Anvin   x86, bios: Make t...
1632
  config X86_RESERVE_LOW
d0cd7425f   H. Peter Anvin   x86, bios: By def...
1633
1634
1635
  	int "Amount of low memory, in kilobytes, to reserve for the BIOS"
  	default 64
  	range 4 640
a7f7f6248   Masahiro Yamada   treewide: replace...
1636
  	help
d0cd7425f   H. Peter Anvin   x86, bios: By def...
1637
1638
1639
1640
1641
1642
1643
1644
1645
  	  Specify the amount of low memory to reserve for the BIOS.
  
  	  The first page contains BIOS data structures that the kernel
  	  must not use, so that page must always be reserved.
  
  	  By default we reserve the first 64K of physical RAM, as a
  	  number of BIOSes are known to corrupt that memory range
  	  during events such as suspend/resume or monitor cable
  	  insertion, so it must not be used by the kernel.
fc3815194   Ingo Molnar   x86: add X86_RESE...
1646

d0cd7425f   H. Peter Anvin   x86, bios: By def...
1647
1648
1649
1650
1651
  	  You can set this to 4 if you are absolutely sure that you
  	  trust the BIOS to get all its memory reservations and usages
  	  right.  If you know your BIOS have problems beyond the
  	  default 64K area, you can set this to 640 to avoid using the
  	  entire low memory range.
fc3815194   Ingo Molnar   x86: add X86_RESE...
1652

d0cd7425f   H. Peter Anvin   x86, bios: By def...
1653
1654
1655
1656
1657
  	  If you have doubts about the BIOS (e.g. suspend/resume does
  	  not work or there's kernel crashes after certain hardware
  	  hotplug events) then you might want to enable
  	  X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
  	  typical corruption patterns.
fc3815194   Ingo Molnar   x86: add X86_RESE...
1658

d0cd7425f   H. Peter Anvin   x86, bios: By def...
1659
  	  Leave this to the default value of 64 if you are unsure.
fc3815194   Ingo Molnar   x86: add X86_RESE...
1660

506f1d07b   Sam Ravnborg   x86: move the res...
1661
1662
  config MATH_EMULATION
  	bool
a5b9e5a2f   Andy Lutomirski   x86/ldt: Make mod...
1663
  	depends on MODIFY_LDT_SYSCALL
87d6021b8   Arnd Bergmann   x86/math-emu: Lim...
1664
  	prompt "Math emulation" if X86_32 && (M486SX || MELAN)
a7f7f6248   Masahiro Yamada   treewide: replace...
1665
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1666
1667
1668
1669
1670
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  	  Linux can emulate a math coprocessor (used for floating point
  	  operations) if you don't have one. 486DX and Pentium processors have
  	  a math coprocessor built in, 486SX and 386 do not, unless you added
  	  a 487DX or 387, respectively. (The messages during boot time can
  	  give you some hints here ["man dmesg"].) Everyone needs either a
  	  coprocessor or this emulation.
  
  	  If you don't have a math coprocessor, you need to say Y here; if you
  	  say Y here even though you have a coprocessor, the coprocessor will
  	  be used nevertheless. (This behavior can be changed with the kernel
  	  command line option "no387", which comes handy if your coprocessor
  	  is broken. Try "man bootparam" or see the documentation of your boot
  	  loader (lilo or loadlin) about how to pass options to the kernel at
  	  boot time.) This means that it is a good idea to say Y here if you
  	  intend to use this kernel on different machines.
  
  	  More information about the internals of the Linux math coprocessor
  	  emulation can be found in <file:arch/x86/math-emu/README>.
  
  	  If you are not sure, say Y; apart from resulting in a 66 KB bigger
  	  kernel, it won't hurt.
  
  config MTRR
6fc108a08   Jan Beulich   x86: Clean up arc...
1689
  	def_bool y
6a108a14f   David Rientjes   kconfig: rename C...
1690
  	prompt "MTRR (Memory Type Range Register) support" if EXPERT
a7f7f6248   Masahiro Yamada   treewide: replace...
1691
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1692
1693
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  	  On Intel P6 family processors (Pentium Pro, Pentium II and later)
  	  the Memory Type Range Registers (MTRRs) may be used to control
  	  processor access to memory ranges. This is most useful if you have
  	  a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  	  allows bus write transfers to be combined into a larger transfer
  	  before bursting over the PCI/AGP bus. This can increase performance
  	  of image write operations 2.5 times or more. Saying Y here creates a
  	  /proc/mtrr file which may be used to manipulate your processor's
  	  MTRRs. Typically the X server should use this.
  
  	  This code has a reasonably generic interface so that similar
  	  control registers on other processors can be easily supported
  	  as well:
  
  	  The Cyrix 6x86, 6x86MX and M II processors have Address Range
  	  Registers (ARRs) which provide a similar functionality to MTRRs. For
  	  these, the ARRs are used to emulate the MTRRs.
  	  The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  	  MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  	  write-combining. All of these processors are supported by this code
  	  and it makes sense to say Y here if you have one of them.
  
  	  Saying Y here also fixes a problem with buggy SMP BIOSes which only
  	  set the MTRRs for the boot CPU and not for the secondary CPUs. This
  	  can lead to all sorts of problems, so it's good to say Y here.
  
  	  You can safely say Y even if your machine doesn't have MTRRs, you'll
  	  just add about 9 KB to your kernel.
cb1aaebea   Mauro Carvalho Chehab   docs: fix broken ...
1720
  	  See <file:Documentation/x86/mtrr.rst> for more information.
506f1d07b   Sam Ravnborg   x86: move the res...
1721

95ffa2438   Yinghai Lu   x86: mtrr cleanup...
1722
  config MTRR_SANITIZER
2ffb3501f   Yinghai Lu   x86: change MTRR_...
1723
  	def_bool y
95ffa2438   Yinghai Lu   x86: mtrr cleanup...
1724
1725
  	prompt "MTRR cleanup support"
  	depends on MTRR
a7f7f6248   Masahiro Yamada   treewide: replace...
1726
  	help
aba3728ce   Thomas Gleixner   x86: sanitize Kco...
1727
1728
  	  Convert MTRR layout from continuous to discrete, so X drivers can
  	  add writeback entries.
95ffa2438   Yinghai Lu   x86: mtrr cleanup...
1729

aba3728ce   Thomas Gleixner   x86: sanitize Kco...
1730
  	  Can be disabled with disable_mtrr_cleanup on the kernel command line.
692105b8a   Matt LaPlante   trivial: fix typo...
1731
  	  The largest mtrr entry size for a continuous block can be set with
aba3728ce   Thomas Gleixner   x86: sanitize Kco...
1732
  	  mtrr_chunk_size.
95ffa2438   Yinghai Lu   x86: mtrr cleanup...
1733

2ffb3501f   Yinghai Lu   x86: change MTRR_...
1734
  	  If unsure, say Y.
95ffa2438   Yinghai Lu   x86: mtrr cleanup...
1735
1736
  
  config MTRR_SANITIZER_ENABLE_DEFAULT
f5098d62c   Yinghai Lu   x86: mtrr cleanup...
1737
1738
1739
  	int "MTRR cleanup enable value (0-1)"
  	range 0 1
  	default "0"
95ffa2438   Yinghai Lu   x86: mtrr cleanup...
1740
  	depends on MTRR_SANITIZER
a7f7f6248   Masahiro Yamada   treewide: replace...
1741
  	help
f5098d62c   Yinghai Lu   x86: mtrr cleanup...
1742
  	  Enable mtrr cleanup default value
95ffa2438   Yinghai Lu   x86: mtrr cleanup...
1743

12031a624   Yinghai Lu   x86: mtrr cleanup...
1744
1745
1746
1747
1748
  config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  	int "MTRR cleanup spare reg num (0-7)"
  	range 0 7
  	default "1"
  	depends on MTRR_SANITIZER
a7f7f6248   Masahiro Yamada   treewide: replace...
1749
  	help
12031a624   Yinghai Lu   x86: mtrr cleanup...
1750
  	  mtrr cleanup spare entries default, it can be changed via
aba3728ce   Thomas Gleixner   x86: sanitize Kco...
1751
  	  mtrr_spare_reg_nr=N on the kernel command line.
12031a624   Yinghai Lu   x86: mtrr cleanup...
1752

2e5d9c857   venkatesh.pallipadi@intel.com   x86: PAT infrastr...
1753
  config X86_PAT
6fc108a08   Jan Beulich   x86: Clean up arc...
1754
  	def_bool y
6a108a14f   David Rientjes   kconfig: rename C...
1755
  	prompt "x86 PAT support" if EXPERT
2a8a2719b   Ingo Molnar   x86 PAT: decouple...
1756
  	depends on MTRR
a7f7f6248   Masahiro Yamada   treewide: replace...
1757
  	help
2e5d9c857   venkatesh.pallipadi@intel.com   x86: PAT infrastr...
1758
  	  Use PAT attributes to setup page level cache control.
042b78e4d   Venki Pallipadi   x86: PAT infrastr...
1759

2e5d9c857   venkatesh.pallipadi@intel.com   x86: PAT infrastr...
1760
1761
1762
1763
  	  PATs are the modern equivalents of MTRRs and are much more
  	  flexible than MTRRs.
  
  	  Say N here if you see bootup problems (boot crash, boot hang,
042b78e4d   Venki Pallipadi   x86: PAT infrastr...
1764
  	  spontaneous reboots) or a non-working video driver.
2e5d9c857   venkatesh.pallipadi@intel.com   x86: PAT infrastr...
1765
1766
  
  	  If unsure, say Y.
46cf98cda   Venkatesh Pallipadi   x86, pat: General...
1767
1768
1769
  config ARCH_USES_PG_UNCACHED
  	def_bool y
  	depends on X86_PAT
628c6246d   H. Peter Anvin   x86, random: Arch...
1770
1771
1772
  config ARCH_RANDOM
  	def_bool y
  	prompt "x86 architectural random number generator" if EXPERT
a7f7f6248   Masahiro Yamada   treewide: replace...
1773
  	help
628c6246d   H. Peter Anvin   x86, random: Arch...
1774
1775
1776
1777
  	  Enable the x86 architectural RDRAND instruction
  	  (Intel Bull Mountain technology) to generate random numbers.
  	  If supported, this is a high bandwidth, cryptographically
  	  secure hardware random number generator.
51ae4a2d7   H. Peter Anvin   x86, smap: Add a ...
1778
1779
1780
  config X86_SMAP
  	def_bool y
  	prompt "Supervisor Mode Access Prevention" if EXPERT
a7f7f6248   Masahiro Yamada   treewide: replace...
1781
  	help
51ae4a2d7   H. Peter Anvin   x86, smap: Add a ...
1782
1783
1784
1785
1786
1787
  	  Supervisor Mode Access Prevention (SMAP) is a security
  	  feature in newer Intel processors.  There is a small
  	  performance cost if this enabled and turned on; there is
  	  also a small increase in the kernel size if this is enabled.
  
  	  If unsure, say Y.
b971880fe   Babu Moger   x86/Kconfig: Rena...
1788
  config X86_UMIP
796ebc81b   Ricardo Neri   x86/umip: Select ...
1789
  	def_bool y
b971880fe   Babu Moger   x86/Kconfig: Rena...
1790
  	prompt "User Mode Instruction Prevention" if EXPERT
a7f7f6248   Masahiro Yamada   treewide: replace...
1791
  	help
b971880fe   Babu Moger   x86/Kconfig: Rena...
1792
1793
1794
1795
1796
  	  User Mode Instruction Prevention (UMIP) is a security feature in
  	  some x86 processors. If enabled, a general protection fault is
  	  issued if the SGDT, SLDT, SIDT, SMSW or STR instructions are
  	  executed in user mode. These instructions unnecessarily expose
  	  information about the hardware state.
796ebc81b   Ricardo Neri   x86/umip: Select ...
1797
1798
1799
1800
1801
  
  	  The vast majority of applications do not use these instructions.
  	  For the very few that do, software emulation is provided in
  	  specific cases in protected and virtual-8086 modes. Emulated
  	  results are dummy.
aa35f8969   Ricardo Neri   x86/umip: Enable ...
1802

35e97790f   Dave Hansen   x86/mm/pkeys: Add...
1803
  config X86_INTEL_MEMORY_PROTECTION_KEYS
38f3e775e   Babu Moger   x86/Kconfig: Upda...
1804
  	prompt "Memory Protection Keys"
35e97790f   Dave Hansen   x86/mm/pkeys: Add...
1805
  	def_bool y
284244a98   Dave Hansen   x86/mm/pkeys: Add...
1806
  	# Note: only available in 64-bit mode
38f3e775e   Babu Moger   x86/Kconfig: Upda...
1807
  	depends on X86_64 && (CPU_SUP_INTEL || CPU_SUP_AMD)
52c8e6017   Ingo Molnar   x86/kconfig, x86/...
1808
1809
  	select ARCH_USES_HIGH_VMA_FLAGS
  	select ARCH_HAS_PKEYS
a7f7f6248   Masahiro Yamada   treewide: replace...
1810
  	help
284244a98   Dave Hansen   x86/mm/pkeys: Add...
1811
1812
1813
  	  Memory Protection Keys provides a mechanism for enforcing
  	  page-based protections, but without requiring modification of the
  	  page tables when an application changes protection domains.
1eecbcdca   Mauro Carvalho Chehab   docs: move protec...
1814
  	  For details, see Documentation/core-api/protection-keys.rst
284244a98   Dave Hansen   x86/mm/pkeys: Add...
1815
1816
  
  	  If unsure, say y.
35e97790f   Dave Hansen   x86/mm/pkeys: Add...
1817

db616173d   Michal Hocko   x86/tsx: Add conf...
1818
1819
1820
1821
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1859
1860
1861
  choice
  	prompt "TSX enable mode"
  	depends on CPU_SUP_INTEL
  	default X86_INTEL_TSX_MODE_OFF
  	help
  	  Intel's TSX (Transactional Synchronization Extensions) feature
  	  allows to optimize locking protocols through lock elision which
  	  can lead to a noticeable performance boost.
  
  	  On the other hand it has been shown that TSX can be exploited
  	  to form side channel attacks (e.g. TAA) and chances are there
  	  will be more of those attacks discovered in the future.
  
  	  Therefore TSX is not enabled by default (aka tsx=off). An admin
  	  might override this decision by tsx=on the command line parameter.
  	  Even with TSX enabled, the kernel will attempt to enable the best
  	  possible TAA mitigation setting depending on the microcode available
  	  for the particular machine.
  
  	  This option allows to set the default tsx mode between tsx=on, =off
  	  and =auto. See Documentation/admin-guide/kernel-parameters.txt for more
  	  details.
  
  	  Say off if not sure, auto if TSX is in use but it should be used on safe
  	  platforms or on if TSX is in use and the security aspect of tsx is not
  	  relevant.
  
  config X86_INTEL_TSX_MODE_OFF
  	bool "off"
  	help
  	  TSX is disabled if possible - equals to tsx=off command line parameter.
  
  config X86_INTEL_TSX_MODE_ON
  	bool "on"
  	help
  	  TSX is always enabled on TSX capable HW - equals the tsx=on command
  	  line parameter.
  
  config X86_INTEL_TSX_MODE_AUTO
  	bool "auto"
  	help
  	  TSX is enabled on TSX capable HW that is believed to be safe against
  	  side channel attacks- equals the tsx=auto command line parameter.
  endchoice
506f1d07b   Sam Ravnborg   x86: move the res...
1862
  config EFI
9ba16087d   Jan Beulich   Kconfig: eliminat...
1863
  	bool "EFI runtime service support"
5b83683f3   Huang, Ying   x86: EFI runtime ...
1864
  	depends on ACPI
f6ce50026   Sergey Vlasov   x86/Kconfig: Make...
1865
  	select UCS2_STRING
022ee6c55   Ard Biesheuvel   efi/x86: Move UEF...
1866
  	select EFI_RUNTIME_WRAPPERS
a7f7f6248   Masahiro Yamada   treewide: replace...
1867
  	help
8f9ca475c   Ingo Molnar   x86: clean up arc...
1868
1869
  	  This enables the kernel to use EFI runtime services that are
  	  available (such as the EFI variable services).
506f1d07b   Sam Ravnborg   x86: move the res...
1870

8f9ca475c   Ingo Molnar   x86: clean up arc...
1871
1872
1873
1874
1875
1876
  	  This option is only useful on systems that have EFI firmware.
  	  In addition, you should use the latest ELILO loader available
  	  at <http://elilo.sourceforge.net> in order to take advantage
  	  of EFI runtime services. However, even with this option, the
  	  resultant kernel should continue to boot on existing non-EFI
  	  platforms.
506f1d07b   Sam Ravnborg   x86: move the res...
1877

291f36325   Matt Fleming   x86, efi: EFI boo...
1878
  config EFI_STUB
8f24f8c2f   Ard Biesheuvel   efi/libstub: Anno...
1879
1880
1881
1882
  	bool "EFI stub support"
  	depends on EFI && !X86_USE_3DNOW
  	depends on $(cc-option,-mabi=ms) || X86_32
  	select RELOCATABLE
a7f7f6248   Masahiro Yamada   treewide: replace...
1883
  	help
8f24f8c2f   Ard Biesheuvel   efi/libstub: Anno...
1884
  	  This kernel feature allows a bzImage to be loaded directly
291f36325   Matt Fleming   x86, efi: EFI boo...
1885
  	  by EFI firmware without the use of a bootloader.
4f4cfa6c5   Mauro Carvalho Chehab   docs: admin-guide...
1886
  	  See Documentation/admin-guide/efi-stub.rst for more information.
0c7596621   Matt Fleming   x86, efi: Add EFI...
1887

7d453eee3   Matt Fleming   x86/efi: Wire up ...
1888
1889
1890
  config EFI_MIXED
  	bool "EFI mixed-mode support"
  	depends on EFI_STUB && X86_64
a7f7f6248   Masahiro Yamada   treewide: replace...
1891
  	help
7d453eee3   Matt Fleming   x86/efi: Wire up ...
1892
1893
1894
1895
1896
1897
1898
1899
1900
  	   Enabling this feature allows a 64-bit kernel to be booted
  	   on a 32-bit firmware, provided that your CPU supports 64-bit
  	   mode.
  
  	   Note that it is not possible to boot a mixed-mode enabled
  	   kernel via the EFI boot stub - a bootloader that supports
  	   the EFI handover protocol must be used.
  
  	   If unsure, say N.
8636a1f96   Masahiro Yamada   treewide: surroun...
1901
  source "kernel/Kconfig.hz"
506f1d07b   Sam Ravnborg   x86: move the res...
1902
1903
1904
  
  config KEXEC
  	bool "kexec system call"
2965faa5e   Dave Young   kexec: split kexe...
1905
  	select KEXEC_CORE
a7f7f6248   Masahiro Yamada   treewide: replace...
1906
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1907
1908
1909
1910
1911
1912
1913
1914
1915
  	  kexec is a system call that implements the ability to shutdown your
  	  current kernel, and to start another kernel.  It is like a reboot
  	  but it is independent of the system firmware.   And like a reboot
  	  you can start any kernel with it, not just Linux.
  
  	  The name comes from the similarity to the exec system call.
  
  	  It is an ongoing process to be certain the hardware in a machine
  	  is properly shutdown, so do not be surprised if this code does not
bf2206957   Geert Uytterhoeven   Kconfig: Remove h...
1916
1917
1918
  	  initially work for you.  As of this writing the exact hardware
  	  interface is strongly in flux, so no good recommendation can be
  	  made.
506f1d07b   Sam Ravnborg   x86: move the res...
1919

74ca317c2   Vivek Goyal   kexec: create a n...
1920
1921
  config KEXEC_FILE
  	bool "kexec file based system call"
2965faa5e   Dave Young   kexec: split kexe...
1922
  	select KEXEC_CORE
74ca317c2   Vivek Goyal   kexec: create a n...
1923
  	select BUILD_BIN2C
74ca317c2   Vivek Goyal   kexec: create a n...
1924
1925
1926
  	depends on X86_64
  	depends on CRYPTO=y
  	depends on CRYPTO_SHA256=y
a7f7f6248   Masahiro Yamada   treewide: replace...
1927
  	help
74ca317c2   Vivek Goyal   kexec: create a n...
1928
1929
1930
1931
  	  This is new version of kexec system call. This system call is
  	  file based and takes file descriptors as system call argument
  	  for kernel and initramfs as opposed to list of segments as
  	  accepted by previous system call.
b799a09f6   AKASHI Takahiro   kexec_file: make ...
1932
1933
  config ARCH_HAS_KEXEC_PURGATORY
  	def_bool KEXEC_FILE
99d5cadfd   Jiri Bohac   kexec_file: split...
1934
  config KEXEC_SIG
8e7d83810   Vivek Goyal   kexec: verify the...
1935
  	bool "Verify kernel signature during kexec_file_load() syscall"
74ca317c2   Vivek Goyal   kexec: create a n...
1936
  	depends on KEXEC_FILE
a7f7f6248   Masahiro Yamada   treewide: replace...
1937
  	help
d8eb89404   Borislav Petkov   x86/kexec: Cleanu...
1938

99d5cadfd   Jiri Bohac   kexec_file: split...
1939
1940
1941
1942
1943
1944
  	  This option makes the kexec_file_load() syscall check for a valid
  	  signature of the kernel image.  The image can still be loaded without
  	  a valid signature unless you also enable KEXEC_SIG_FORCE, though if
  	  there's a signature that we can check, then it must be valid.
  
  	  In addition to this option, you need to enable signature
d8eb89404   Borislav Petkov   x86/kexec: Cleanu...
1945
1946
  	  verification for the corresponding kernel image type being
  	  loaded in order for this to work.
8e7d83810   Vivek Goyal   kexec: verify the...
1947

99d5cadfd   Jiri Bohac   kexec_file: split...
1948
1949
1950
  config KEXEC_SIG_FORCE
  	bool "Require a valid signature in kexec_file_load() syscall"
  	depends on KEXEC_SIG
a7f7f6248   Masahiro Yamada   treewide: replace...
1951
  	help
99d5cadfd   Jiri Bohac   kexec_file: split...
1952
1953
  	  This option makes kernel signature verification mandatory for
  	  the kexec_file_load() syscall.
8e7d83810   Vivek Goyal   kexec: verify the...
1954
1955
  config KEXEC_BZIMAGE_VERIFY_SIG
  	bool "Enable bzImage signature verification support"
99d5cadfd   Jiri Bohac   kexec_file: split...
1956
  	depends on KEXEC_SIG
8e7d83810   Vivek Goyal   kexec: verify the...
1957
1958
  	depends on SIGNED_PE_FILE_VERIFICATION
  	select SYSTEM_TRUSTED_KEYRING
a7f7f6248   Masahiro Yamada   treewide: replace...
1959
  	help
8e7d83810   Vivek Goyal   kexec: verify the...
1960
  	  Enable bzImage signature verification support.
506f1d07b   Sam Ravnborg   x86: move the res...
1961
  config CRASH_DUMP
04b69447f   Pavel Machek   arch/x86/Kconfig:...
1962
  	bool "kernel crash dumps"
506f1d07b   Sam Ravnborg   x86: move the res...
1963
  	depends on X86_64 || (X86_32 && HIGHMEM)
a7f7f6248   Masahiro Yamada   treewide: replace...
1964
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1965
1966
1967
1968
1969
1970
1971
1972
  	  Generate crash dump after being started by kexec.
  	  This should be normally only set in special crash dump kernels
  	  which are loaded in the main kernel with kexec-tools into
  	  a specially reserved region and then later executed after
  	  a crash by kdump/kexec. The crash dump kernel must be compiled
  	  to a memory address not used by the main kernel or BIOS using
  	  PHYSICAL_START, or it must be built as a relocatable image
  	  (CONFIG_RELOCATABLE=y).
330d48105   Mauro Carvalho Chehab   docs: admin-guide...
1973
  	  For more details see Documentation/admin-guide/kdump/kdump.rst
506f1d07b   Sam Ravnborg   x86: move the res...
1974

3ab835213   Huang Ying   kexec jump
1975
  config KEXEC_JUMP
6ea303864   Kees Cook   arch/x86: remove ...
1976
  	bool "kexec jump"
fee7b0d84   Huang Ying   x86, kexec: x86_6...
1977
  	depends on KEXEC && HIBERNATION
a7f7f6248   Masahiro Yamada   treewide: replace...
1978
  	help
89081d17f   Huang Ying   kexec jump: save/...
1979
1980
  	  Jump between original kernel and kexeced kernel and invoke
  	  code in physical address mode via KEXEC
3ab835213   Huang Ying   kexec jump
1981

506f1d07b   Sam Ravnborg   x86: move the res...
1982
  config PHYSICAL_START
6a108a14f   David Rientjes   kconfig: rename C...
1983
  	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
ceefccc93   H. Peter Anvin   x86: default CONF...
1984
  	default "0x1000000"
a7f7f6248   Masahiro Yamada   treewide: replace...
1985
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
  	  This gives the physical address where the kernel is loaded.
  
  	  If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  	  bzImage will decompress itself to above physical address and
  	  run from there. Otherwise, bzImage will run from the address where
  	  it has been loaded by the boot loader and will ignore above physical
  	  address.
  
  	  In normal kdump cases one does not have to set/change this option
  	  as now bzImage can be compiled as a completely relocatable image
  	  (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  	  address. This option is mainly useful for the folks who don't want
  	  to use a bzImage for capturing the crash dump and want to use a
  	  vmlinux instead. vmlinux is not relocatable hence a kernel needs
  	  to be specifically compiled to run from a specific memory area
  	  (normally a reserved region) and this option comes handy.
ceefccc93   H. Peter Anvin   x86: default CONF...
2002
2003
2004
2005
2006
2007
2008
  	  So if you are using bzImage for capturing the crash dump,
  	  leave the value here unchanged to 0x1000000 and set
  	  CONFIG_RELOCATABLE=y.  Otherwise if you plan to use vmlinux
  	  for capturing the crash dump change this value to start of
  	  the reserved region.  In other words, it can be set based on
  	  the "X" value as specified in the "crashkernel=YM@XM"
  	  command line boot parameter passed to the panic-ed
330d48105   Mauro Carvalho Chehab   docs: admin-guide...
2009
  	  kernel. Please take a look at Documentation/admin-guide/kdump/kdump.rst
ceefccc93   H. Peter Anvin   x86: default CONF...
2010
  	  for more details about crash dumps.
506f1d07b   Sam Ravnborg   x86: move the res...
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
  
  	  Usage of bzImage for capturing the crash dump is recommended as
  	  one does not have to build two kernels. Same kernel can be used
  	  as production kernel and capture kernel. Above option should have
  	  gone away after relocatable bzImage support is introduced. But it
  	  is present because there are users out there who continue to use
  	  vmlinux for dump capture. This option should go away down the
  	  line.
  
  	  Don't change this unless you know what you are doing.
  
  config RELOCATABLE
26717808f   H. Peter Anvin   x86: make CONFIG_...
2023
2024
  	bool "Build a relocatable kernel"
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
2025
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
  	  This builds a kernel image that retains relocation information
  	  so it can be loaded someplace besides the default 1MB.
  	  The relocations tend to make the kernel binary about 10% larger,
  	  but are discarded at runtime.
  
  	  One use is for the kexec on panic case where the recovery kernel
  	  must live at a different physical address than the primary
  	  kernel.
  
  	  Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  	  it has been loaded at and the compile time physical address
8ab3820fd   Kees Cook   x86, kaslr: Retur...
2037
  	  (CONFIG_PHYSICAL_START) is used as the minimum location.
506f1d07b   Sam Ravnborg   x86: move the res...
2038

8ab3820fd   Kees Cook   x86, kaslr: Retur...
2039
  config RANDOMIZE_BASE
e8581e3d6   Baoquan He   x86/KASLR: Drop C...
2040
  	bool "Randomize the address of the kernel image (KASLR)"
8ab3820fd   Kees Cook   x86, kaslr: Retur...
2041
  	depends on RELOCATABLE
6807c8465   Ingo Molnar   x86: Enable KASLR...
2042
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
2043
  	help
e8581e3d6   Baoquan He   x86/KASLR: Drop C...
2044
2045
2046
2047
2048
2049
  	  In support of Kernel Address Space Layout Randomization (KASLR),
  	  this randomizes the physical address at which the kernel image
  	  is decompressed and the virtual address where the kernel
  	  image is mapped, as a security feature that deters exploit
  	  attempts relying on knowledge of the location of kernel
  	  code internals.
ed9f007ee   Kees Cook   x86/KASLR: Extend...
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
  	  On 64-bit, the kernel physical and virtual addresses are
  	  randomized separately. The physical address will be anywhere
  	  between 16MB and the top of physical memory (up to 64TB). The
  	  virtual address will be randomized from 16MB up to 1GB (9 bits
  	  of entropy). Note that this also reduces the memory space
  	  available to kernel modules from 1.5GB to 1GB.
  
  	  On 32-bit, the kernel physical and virtual addresses are
  	  randomized together. They will be randomized from 16MB up to
  	  512MB (8 bits of entropy).
e8581e3d6   Baoquan He   x86/KASLR: Drop C...
2060
2061
2062
2063
  
  	  Entropy is generated using the RDRAND instruction if it is
  	  supported. If RDTSC is supported, its value is mixed into
  	  the entropy pool as well. If neither RDRAND nor RDTSC are
ed9f007ee   Kees Cook   x86/KASLR: Extend...
2064
2065
2066
2067
2068
2069
  	  supported, then entropy is read from the i8254 timer. The
  	  usable entropy is limited by the kernel being built using
  	  2GB addressing, and that PHYSICAL_ALIGN must be at a
  	  minimum of 2MB. As a result, only 10 bits of entropy are
  	  theoretically possible, but the implementations are further
  	  limited due to memory layouts.
e8581e3d6   Baoquan He   x86/KASLR: Drop C...
2070

6807c8465   Ingo Molnar   x86: Enable KASLR...
2071
  	  If unsure, say Y.
8ab3820fd   Kees Cook   x86, kaslr: Retur...
2072
2073
  
  # Relocation on x86 needs some additional build support
845adf726   H. Peter Anvin   x86: add a Kconfi...
2074
2075
  config X86_NEED_RELOCS
  	def_bool y
8ab3820fd   Kees Cook   x86, kaslr: Retur...
2076
  	depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
845adf726   H. Peter Anvin   x86: add a Kconfi...
2077

506f1d07b   Sam Ravnborg   x86: move the res...
2078
  config PHYSICAL_ALIGN
a02150610   Kees Cook   x86, relocs: Move...
2079
  	hex "Alignment value to which kernel should be aligned"
8ab3820fd   Kees Cook   x86, kaslr: Retur...
2080
  	default "0x200000"
a02150610   Kees Cook   x86, relocs: Move...
2081
2082
  	range 0x2000 0x1000000 if X86_32
  	range 0x200000 0x1000000 if X86_64
a7f7f6248   Masahiro Yamada   treewide: replace...
2083
  	help
506f1d07b   Sam Ravnborg   x86: move the res...
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
  	  This value puts the alignment restrictions on physical address
  	  where kernel is loaded and run from. Kernel is compiled for an
  	  address which meets above alignment restriction.
  
  	  If bootloader loads the kernel at a non-aligned address and
  	  CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  	  address aligned to above value and run from there.
  
  	  If bootloader loads the kernel at a non-aligned address and
  	  CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  	  load address and decompress itself to the address it has been
  	  compiled for and run from there. The address for which kernel is
  	  compiled already meets above alignment restrictions. Hence the
  	  end result is that kernel runs from a physical address meeting
  	  above alignment restrictions.
a02150610   Kees Cook   x86, relocs: Move...
2099
2100
  	  On 32-bit this value must be a multiple of 0x2000. On 64-bit
  	  this value must be a multiple of 0x200000.
506f1d07b   Sam Ravnborg   x86: move the res...
2101
  	  Don't change this unless you know what you are doing.
eedb92abb   Kirill A. Shutemov   x86/mm: Make virt...
2102
2103
  config DYNAMIC_MEMORY_LAYOUT
  	bool
a7f7f6248   Masahiro Yamada   treewide: replace...
2104
  	help
eedb92abb   Kirill A. Shutemov   x86/mm: Make virt...
2105
2106
  	  This option makes base addresses of vmalloc and vmemmap as well as
  	  __PAGE_OFFSET movable during boot.
0483e1fa6   Thomas Garnier   x86/mm: Implement...
2107
2108
2109
2110
  config RANDOMIZE_MEMORY
  	bool "Randomize the kernel memory sections"
  	depends on X86_64
  	depends on RANDOMIZE_BASE
eedb92abb   Kirill A. Shutemov   x86/mm: Make virt...
2111
  	select DYNAMIC_MEMORY_LAYOUT
0483e1fa6   Thomas Garnier   x86/mm: Implement...
2112
  	default RANDOMIZE_BASE
a7f7f6248   Masahiro Yamada   treewide: replace...
2113
  	help
0483e1fa6   Thomas Garnier   x86/mm: Implement...
2114
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2121
  	   Randomizes the base virtual address of kernel memory sections
  	   (physical memory mapping, vmalloc & vmemmap). This security feature
  	   makes exploits relying on predictable memory locations less reliable.
  
  	   The order of allocations remains unchanged. Entropy is generated in
  	   the same way as RANDOMIZE_BASE. Current implementation in the optimal
  	   configuration have in average 30,000 different possible virtual
  	   addresses for each memory section.
6807c8465   Ingo Molnar   x86: Enable KASLR...
2122
  	   If unsure, say Y.
0483e1fa6   Thomas Garnier   x86/mm: Implement...
2123

90397a417   Thomas Garnier   x86/mm: Add memor...
2124
2125
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2128
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2130
  config RANDOMIZE_MEMORY_PHYSICAL_PADDING
  	hex "Physical memory mapping padding" if EXPERT
  	depends on RANDOMIZE_MEMORY
  	default "0xa" if MEMORY_HOTPLUG
  	default "0x0"
  	range 0x1 0x40 if MEMORY_HOTPLUG
  	range 0x0 0x40
a7f7f6248   Masahiro Yamada   treewide: replace...
2131
  	help
90397a417   Thomas Garnier   x86/mm: Add memor...
2132
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2137
  	   Define the padding in terabytes added to the existing physical
  	   memory size during kernel memory randomization. It is useful
  	   for memory hotplug support but reduces the entropy available for
  	   address randomization.
  
  	   If unsure, leave at the default value.
506f1d07b   Sam Ravnborg   x86: move the res...
2138
  config HOTPLUG_CPU
bebd024e4   Thomas Gleixner   x86/smp: Enforce ...
2139
  	def_bool y
40b313608   Stephen Rothwell   Finally eradicate...
2140
  	depends on SMP
506f1d07b   Sam Ravnborg   x86: move the res...
2141

80aa1dff6   Fenghua Yu   x86, Kconfig: Add...
2142
2143
  config BOOTPARAM_HOTPLUG_CPU0
  	bool "Set default setting of cpu0_hotpluggable"
2c922cd07   Kees Cook   x86/cpu/hotplug: ...
2144
  	depends on HOTPLUG_CPU
a7f7f6248   Masahiro Yamada   treewide: replace...
2145
  	help
80aa1dff6   Fenghua Yu   x86, Kconfig: Add...
2146
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  	  Set whether default state of cpu0_hotpluggable is on or off.
  
  	  Say Y here to enable CPU0 hotplug by default. If this switch
  	  is turned on, there is no need to give cpu0_hotplug kernel
  	  parameter and the CPU0 hotplug feature is enabled by default.
  
  	  Please note: there are two known CPU0 dependencies if you want
  	  to enable the CPU0 hotplug feature either by this switch or by
  	  cpu0_hotplug kernel parameter.
  
  	  First, resume from hibernate or suspend always starts from CPU0.
  	  So hibernate and suspend are prevented if CPU0 is offline.
  
  	  Second dependency is PIC interrupts always go to CPU0. CPU0 can not
  	  offline if any interrupt can not migrate out of CPU0. There may
  	  be other CPU0 dependencies.
  
  	  Please make sure the dependencies are under your control before
  	  you enable this feature.
  
  	  Say N if you don't want to enable CPU0 hotplug feature by default.
  	  You still can enable the CPU0 hotplug feature at boot by kernel
  	  parameter cpu0_hotplug.
a71c8bc5d   Fenghua Yu   x86, topology: De...
2169
2170
2171
  config DEBUG_HOTPLUG_CPU0
  	def_bool n
  	prompt "Debug CPU0 hotplug"
2c922cd07   Kees Cook   x86/cpu/hotplug: ...
2172
  	depends on HOTPLUG_CPU
a7f7f6248   Masahiro Yamada   treewide: replace...
2173
  	help
a71c8bc5d   Fenghua Yu   x86, topology: De...
2174
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  	  Enabling this option offlines CPU0 (if CPU0 can be offlined) as
  	  soon as possible and boots up userspace with CPU0 offlined. User
  	  can online CPU0 back after boot time.
  
  	  To debug CPU0 hotplug, you need to enable CPU0 offline/online
  	  feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
  	  compilation or giving cpu0_hotplug kernel parameter at boot.
  
  	  If unsure, say N.
506f1d07b   Sam Ravnborg   x86: move the res...
2183
  config COMPAT_VDSO
b0b49f267   Andy Lutomirski   x86, vdso: Remove...
2184
2185
  	def_bool n
  	prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
953fee1d8   Ingo Molnar   x86/kconfig: Clea...
2186
  	depends on COMPAT_32
a7f7f6248   Masahiro Yamada   treewide: replace...
2187
  	help
b0b49f267   Andy Lutomirski   x86, vdso: Remove...
2188
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2190
  	  Certain buggy versions of glibc will crash if they are
  	  presented with a 32-bit vDSO that is not mapped at the address
  	  indicated in its segment table.
e84446de5   Randy Dunlap   x86 VSDO: Fix Kco...
2191

b0b49f267   Andy Lutomirski   x86, vdso: Remove...
2192
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  	  The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
  	  and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
  	  49ad572a70b8aeb91e57483a11dd1b77e31c4468.  Glibc 2.3.3 is
  	  the only released version with the bug, but OpenSUSE 9
  	  contains a buggy "glibc 2.3.2".
506f1d07b   Sam Ravnborg   x86: move the res...
2197

b0b49f267   Andy Lutomirski   x86, vdso: Remove...
2198
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  	  The symptom of the bug is that everything crashes on startup, saying:
  	  dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
  
  	  Saying Y here changes the default value of the vdso32 boot
  	  option from 1 to 0, which turns off the 32-bit vDSO entirely.
  	  This works around the glibc bug but hurts performance.
  
  	  If unsure, say N: if you are compiling your own kernel, you
  	  are unlikely to be using a buggy version of glibc.
506f1d07b   Sam Ravnborg   x86: move the res...
2207

3dc33bd30   Kees Cook   x86/entry/vsyscal...
2208
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  choice
  	prompt "vsyscall table for legacy applications"
  	depends on X86_64
625b7b7f7   Andy Lutomirski   x86/vsyscall: Cha...
2211
  	default LEGACY_VSYSCALL_XONLY
3dc33bd30   Kees Cook   x86/entry/vsyscal...
2212
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2218
  	help
  	  Legacy user code that does not know how to find the vDSO expects
  	  to be able to issue three syscalls by calling fixed addresses in
  	  kernel space. Since this location is not randomized with ASLR,
  	  it can be used to assist security vulnerability exploitation.
  
  	  This setting can be changed at boot time via the kernel command
bd49e16e3   Andy Lutomirski   x86/vsyscall: Add...
2219
  	  line parameter vsyscall=[emulate|xonly|none].
3dc33bd30   Kees Cook   x86/entry/vsyscal...
2220
2221
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2223
  
  	  On a system with recent enough glibc (2.14 or newer) and no
  	  static binaries, you can say None without a performance penalty
  	  to improve security.
bd49e16e3   Andy Lutomirski   x86/vsyscall: Add...
2224
  	  If unsure, select "Emulate execution only".
3dc33bd30   Kees Cook   x86/entry/vsyscal...
2225

3dc33bd30   Kees Cook   x86/entry/vsyscal...
2226
  	config LEGACY_VSYSCALL_EMULATE
bd49e16e3   Andy Lutomirski   x86/vsyscall: Add...
2227
  		bool "Full emulation"
3dc33bd30   Kees Cook   x86/entry/vsyscal...
2228
  		help
bd49e16e3   Andy Lutomirski   x86/vsyscall: Add...
2229
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  		  The kernel traps and emulates calls into the fixed vsyscall
  		  address mapping. This makes the mapping non-executable, but
  		  it still contains readable known contents, which could be
  		  used in certain rare security vulnerability exploits. This
  		  configuration is recommended when using legacy userspace
  		  that still uses vsyscalls along with legacy binary
  		  instrumentation tools that require code to be readable.
  
  		  An example of this type of legacy userspace is running
  		  Pin on an old binary that still uses vsyscalls.
  
  	config LEGACY_VSYSCALL_XONLY
  		bool "Emulate execution only"
  		help
  		  The kernel traps and emulates calls into the fixed vsyscall
  		  address mapping and does not allow reads.  This
  		  configuration is recommended when userspace might use the
  		  legacy vsyscall area but support for legacy binary
  		  instrumentation of legacy code is not needed.  It mitigates
  		  certain uses of the vsyscall area as an ASLR-bypassing
  		  buffer.
3dc33bd30   Kees Cook   x86/entry/vsyscal...
2250
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2260
  
  	config LEGACY_VSYSCALL_NONE
  		bool "None"
  		help
  		  There will be no vsyscall mapping at all. This will
  		  eliminate any risk of ASLR bypass due to the vsyscall
  		  fixed address mapping. Attempts to use the vsyscalls
  		  will be reported to dmesg, so that either old or
  		  malicious userspace programs can be identified.
  
  endchoice
516cbf373   Tim Bird   x86, bootup: add ...
2261
2262
  config CMDLINE_BOOL
  	bool "Built-in kernel command line"
a7f7f6248   Masahiro Yamada   treewide: replace...
2263
  	help
516cbf373   Tim Bird   x86, bootup: add ...
2264
2265
2266
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2268
2269
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2271
  	  Allow for specifying boot arguments to the kernel at
  	  build time.  On some systems (e.g. embedded ones), it is
  	  necessary or convenient to provide some or all of the
  	  kernel boot arguments with the kernel itself (that is,
  	  to not rely on the boot loader to provide them.)
  
  	  To compile command line arguments into the kernel,
  	  set this option to 'Y', then fill in the
69711ca19   Sébastien Hinderer   x86/kconfig: Fix ...
2272
  	  boot arguments in CONFIG_CMDLINE.
516cbf373   Tim Bird   x86, bootup: add ...
2273
2274
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2280
  
  	  Systems with fully functional boot loaders (i.e. non-embedded)
  	  should leave this option set to 'N'.
  
  config CMDLINE
  	string "Built-in kernel command string"
  	depends on CMDLINE_BOOL
  	default ""
a7f7f6248   Masahiro Yamada   treewide: replace...
2281
  	help
516cbf373   Tim Bird   x86, bootup: add ...
2282
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  	  Enter arguments here that should be compiled into the kernel
  	  image and used at boot time.  If the boot loader provides a
  	  command line at boot time, it is appended to this string to
  	  form the full kernel command line, when the system boots.
  
  	  However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  	  change this behavior.
  
  	  In most cases, the command line (whether built-in or provided
  	  by the boot loader) should specify the device for the root
  	  file system.
  
  config CMDLINE_OVERRIDE
  	bool "Built-in command line overrides boot loader arguments"
645e64662   Anders Roxell   x86/Kconfig: Make...
2296
  	depends on CMDLINE_BOOL && CMDLINE != ""
a7f7f6248   Masahiro Yamada   treewide: replace...
2297
  	help
516cbf373   Tim Bird   x86, bootup: add ...
2298
2299
2300
2301
2302
  	  Set this option to 'Y' to have the kernel ignore the boot loader
  	  command line, and use ONLY the built-in command line.
  
  	  This is used to work around broken boot loaders.  This should
  	  be set to 'N' under normal conditions.
a5b9e5a2f   Andy Lutomirski   x86/ldt: Make mod...
2303
2304
2305
  config MODIFY_LDT_SYSCALL
  	bool "Enable the LDT (local descriptor table)" if EXPERT
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
2306
  	help
a5b9e5a2f   Andy Lutomirski   x86/ldt: Make mod...
2307
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  	  Linux can allow user programs to install a per-process x86
  	  Local Descriptor Table (LDT) using the modify_ldt(2) system
  	  call.  This is required to run 16-bit or segmented code such as
  	  DOSEMU or some Wine programs.  It is also used by some very old
  	  threading libraries.
  
  	  Enabling this feature adds a small amount of overhead to
  	  context switches and increases the low-level kernel attack
  	  surface.  Disabling it removes the modify_ldt(2) system call.
  
  	  Saying 'N' here may make sense for embedded or server kernels.
b700e7f03   Seth Jennings   livepatch: kernel...
2318
  source "kernel/livepatch/Kconfig"
506f1d07b   Sam Ravnborg   x86: move the res...
2319
  endmenu
3072e413e   Michal Hocko   mm/memory_hotplug...
2320
2321
2322
  config ARCH_HAS_ADD_PAGES
  	def_bool y
  	depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
506f1d07b   Sam Ravnborg   x86: move the res...
2323
2324
2325
  config ARCH_ENABLE_MEMORY_HOTPLUG
  	def_bool y
  	depends on X86_64 || (X86_32 && HIGHMEM)
355510533   Gary Hade   x86: add memory h...
2326
2327
2328
  config ARCH_ENABLE_MEMORY_HOTREMOVE
  	def_bool y
  	depends on MEMORY_HOTPLUG
e534c7c5f   Lee Schermerhorn   numa: x86_64: use...
2329
  config USE_PERCPU_NUMA_NODE_ID
645a79195   Tejun Heo   x86: Unify CPU ->...
2330
  	def_bool y
e534c7c5f   Lee Schermerhorn   numa: x86_64: use...
2331
  	depends on NUMA
9491846fc   Kirill A. Shutemov   x86, mm: enable s...
2332
2333
2334
  config ARCH_ENABLE_SPLIT_PMD_PTLOCK
  	def_bool y
  	depends on X86_64 || X86_PAE
c177c81e0   Naoya Horiguchi   hugetlb: restrict...
2335
2336
2337
  config ARCH_ENABLE_HUGEPAGE_MIGRATION
  	def_bool y
  	depends on X86_64 && HUGETLB_PAGE && MIGRATION
9c670ea37   Naoya Horiguchi   mm: thp: introduc...
2338
2339
2340
  config ARCH_ENABLE_THP_MIGRATION
  	def_bool y
  	depends on X86_64 && TRANSPARENT_HUGEPAGE
da85f865b   Bjorn Helgaas   x86: mention ACPI...
2341
  menu "Power management and ACPI options"
e279b6c1d   Sam Ravnborg   x86: start unific...
2342
2343
  
  config ARCH_HIBERNATION_HEADER
3c2362e62   Harvey Harrison   x86: use def_bool...
2344
  	def_bool y
445565303   Zhimin Gu   x86-32, hibernate...
2345
  	depends on HIBERNATION
e279b6c1d   Sam Ravnborg   x86: start unific...
2346
2347
2348
2349
  
  source "kernel/power/Kconfig"
  
  source "drivers/acpi/Kconfig"
efafc8b21   Feng Tang   x86: add arch-spe...
2350
  source "drivers/sfi/Kconfig"
a6b68076f   Andi Kleen   x86: compile apm ...
2351
  config X86_APM_BOOT
6fc108a08   Jan Beulich   x86: Clean up arc...
2352
  	def_bool y
282e5aaba   Paul Bolle   x86: Kconfig: dro...
2353
  	depends on APM
a6b68076f   Andi Kleen   x86: compile apm ...
2354

e279b6c1d   Sam Ravnborg   x86: start unific...
2355
2356
  menuconfig APM
  	tristate "APM (Advanced Power Management) BIOS support"
efefa6f63   Ingo Molnar   x86, VisWS: turn ...
2357
  	depends on X86_32 && PM_SLEEP
a7f7f6248   Masahiro Yamada   treewide: replace...
2358
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2359
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  	  APM is a BIOS specification for saving power using several different
  	  techniques. This is mostly useful for battery powered laptops with
  	  APM compliant BIOSes. If you say Y here, the system time will be
  	  reset after a RESUME operation, the /proc/apm device will provide
  	  battery status information, and user-space programs will receive
  	  notification of APM "events" (e.g. battery status change).
  
  	  If you select "Y" here, you can disable actual use of the APM
  	  BIOS by passing the "apm=off" option to the kernel at boot time.
  
  	  Note that the APM support is almost completely disabled for
  	  machines with more than one CPU.
  
  	  In order to use APM, you will need supporting software. For location
151f4e2bd   Mauro Carvalho Chehab   docs: power: conv...
2373
  	  and more information, read <file:Documentation/power/apm-acpi.rst>
2dc98fd32   Michael Witten   doc: Konfig: Docu...
2374
  	  and the Battery Powered Linux mini-HOWTO, available from
e279b6c1d   Sam Ravnborg   x86: start unific...
2375
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  	  <http://www.tldp.org/docs.html#howto>.
  
  	  This driver does not spin down disk drives (see the hdparm(8)
  	  manpage ("man 8 hdparm") for that), and it doesn't turn off
  	  VESA-compliant "green" monitors.
  
  	  This driver does not support the TI 4000M TravelMate and the ACER
  	  486/DX4/75 because they don't have compliant BIOSes. Many "green"
  	  desktop machines also don't have compliant BIOSes, and this driver
  	  may cause those machines to panic during the boot phase.
  
  	  Generally, if you don't have a battery in your machine, there isn't
  	  much point in using this driver and you should say N. If you get
  	  random kernel OOPSes or reboots that don't seem to be related to
  	  anything, try disabling/enabling this option (or disabling/enabling
  	  APM in your BIOS).
  
  	  Some other things you should try when experiencing seemingly random,
  	  "weird" problems:
  
  	  1) make sure that you have enough swap space and that it is
  	  enabled.
  	  2) pass the "no-hlt" option to the kernel
  	  3) switch on floating point emulation in the kernel and pass
  	  the "no387" option to the kernel
  	  4) pass the "floppy=nodma" option to the kernel
  	  5) pass the "mem=4M" option to the kernel (thereby disabling
  	  all but the first 4 MB of RAM)
  	  6) make sure that the CPU is not over clocked.
  	  7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  	  8) disable the cache from your BIOS settings
  	  9) install a fan for the video card or exchange video RAM
  	  10) install a better fan for the CPU
  	  11) exchange RAM chips
  	  12) exchange the motherboard.
  
  	  To compile this driver as a module, choose M here: the
  	  module will be called apm.
  
  if APM
  
  config APM_IGNORE_USER_SUSPEND
  	bool "Ignore USER SUSPEND"
a7f7f6248   Masahiro Yamada   treewide: replace...
2418
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2419
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  	  This option will ignore USER SUSPEND requests. On machines with a
  	  compliant APM BIOS, you want to say N. However, on the NEC Versa M
  	  series notebooks, it is necessary to say Y because of a BIOS bug.
  
  config APM_DO_ENABLE
  	bool "Enable PM at boot time"
a7f7f6248   Masahiro Yamada   treewide: replace...
2425
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2426
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  	  Enable APM features at boot time. From page 36 of the APM BIOS
  	  specification: "When disabled, the APM BIOS does not automatically
  	  power manage devices, enter the Standby State, enter the Suspend
  	  State, or take power saving steps in response to CPU Idle calls."
  	  This driver will make CPU Idle calls when Linux is idle (unless this
  	  feature is turned off -- see "Do CPU IDLE calls", below). This
  	  should always save battery power, but more complicated APM features
  	  will be dependent on your BIOS implementation. You may need to turn
  	  this option off if your computer hangs at boot time when using APM
  	  support, or if it beeps continuously instead of suspending. Turn
  	  this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  	  T400CDT. This is off by default since most machines do fine without
  	  this feature.
  
  config APM_CPU_IDLE
dd8af0762   Len Brown   APM idle: registe...
2441
  	depends on CPU_IDLE
e279b6c1d   Sam Ravnborg   x86: start unific...
2442
  	bool "Make CPU Idle calls when idle"
a7f7f6248   Masahiro Yamada   treewide: replace...
2443
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2444
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  	  Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  	  On some machines, this can activate improved power savings, such as
  	  a slowed CPU clock rate, when the machine is idle. These idle calls
  	  are made after the idle loop has run for some length of time (e.g.,
  	  333 mS). On some machines, this will cause a hang at boot time or
  	  whenever the CPU becomes idle. (On machines with more than one CPU,
  	  this option does nothing.)
  
  config APM_DISPLAY_BLANK
  	bool "Enable console blanking using APM"
a7f7f6248   Masahiro Yamada   treewide: replace...
2454
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2455
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  	  Enable console blanking using the APM. Some laptops can use this to
  	  turn off the LCD backlight when the screen blanker of the Linux
  	  virtual console blanks the screen. Note that this is only used by
  	  the virtual console screen blanker, and won't turn off the backlight
  	  when using the X Window system. This also doesn't have anything to
  	  do with your VESA-compliant power-saving monitor. Further, this
  	  option doesn't work for all laptops -- it might not turn off your
  	  backlight at all, or it might print a lot of errors to the console,
  	  especially if you are using gpm.
  
  config APM_ALLOW_INTS
  	bool "Allow interrupts during APM BIOS calls"
a7f7f6248   Masahiro Yamada   treewide: replace...
2467
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2468
2469
2470
2471
2472
2473
  	  Normally we disable external interrupts while we are making calls to
  	  the APM BIOS as a measure to lessen the effects of a badly behaving
  	  BIOS implementation.  The BIOS should reenable interrupts if it
  	  needs to.  Unfortunately, some BIOSes do not -- especially those in
  	  many of the newer IBM Thinkpads.  If you experience hangs when you
  	  suspend, try setting this to Y.  Otherwise, say N.
e279b6c1d   Sam Ravnborg   x86: start unific...
2474
  endif # APM
bb0a56ecc   Dave Jones   [CPUFREQ] Move x8...
2475
  source "drivers/cpufreq/Kconfig"
e279b6c1d   Sam Ravnborg   x86: start unific...
2476
2477
  
  source "drivers/cpuidle/Kconfig"
27471fdb3   Andy Henroid   i7300_idle driver...
2478
  source "drivers/idle/Kconfig"
e279b6c1d   Sam Ravnborg   x86: start unific...
2479
2480
2481
2482
  endmenu
  
  
  menu "Bus options (PCI etc.)"
e279b6c1d   Sam Ravnborg   x86: start unific...
2483
2484
  choice
  	prompt "PCI access mode"
efefa6f63   Ingo Molnar   x86, VisWS: turn ...
2485
  	depends on X86_32 && PCI
e279b6c1d   Sam Ravnborg   x86: start unific...
2486
  	default PCI_GOANY
a7f7f6248   Masahiro Yamada   treewide: replace...
2487
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
  	  On PCI systems, the BIOS can be used to detect the PCI devices and
  	  determine their configuration. However, some old PCI motherboards
  	  have BIOS bugs and may crash if this is done. Also, some embedded
  	  PCI-based systems don't have any BIOS at all. Linux can also try to
  	  detect the PCI hardware directly without using the BIOS.
  
  	  With this option, you can specify how Linux should detect the
  	  PCI devices. If you choose "BIOS", the BIOS will be used,
  	  if you choose "Direct", the BIOS won't be used, and if you
  	  choose "MMConfig", then PCI Express MMCONFIG will be used.
  	  If you choose "Any", the kernel will try MMCONFIG, then the
  	  direct access method and falls back to the BIOS if that doesn't
  	  work. If unsure, go with the default, which is "Any".
  
  config PCI_GOBIOS
  	bool "BIOS"
  
  config PCI_GOMMCONFIG
  	bool "MMConfig"
  
  config PCI_GODIRECT
  	bool "Direct"
3ef0e1f8c   Andres Salomon   x86: olpc: add On...
2510
  config PCI_GOOLPC
76fb65701   Daniel Drake   x86, olpc: Only e...
2511
  	bool "OLPC XO-1"
3ef0e1f8c   Andres Salomon   x86: olpc: add On...
2512
  	depends on OLPC
2bdd1b031   Andres Salomon   PCI/x86: fix up P...
2513
2514
  config PCI_GOANY
  	bool "Any"
e279b6c1d   Sam Ravnborg   x86: start unific...
2515
2516
2517
  endchoice
  
  config PCI_BIOS
3c2362e62   Harvey Harrison   x86: use def_bool...
2518
  	def_bool y
efefa6f63   Ingo Molnar   x86, VisWS: turn ...
2519
  	depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
e279b6c1d   Sam Ravnborg   x86: start unific...
2520
2521
2522
  
  # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  config PCI_DIRECT
3c2362e62   Harvey Harrison   x86: use def_bool...
2523
  	def_bool y
0aba496fc   Shaohua Li   x86/PCI: select d...
2524
  	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
e279b6c1d   Sam Ravnborg   x86: start unific...
2525
2526
  
  config PCI_MMCONFIG
b45c9f365   Jan Kiszka   x86: Consolidate ...
2527
2528
  	bool "Support mmconfig PCI config space access" if X86_64
  	default y
8364e1f83   Jan Kiszka   x86/jailhouse: Al...
2529
  	depends on PCI && (ACPI || SFI || JAILHOUSE_GUEST)
b45c9f365   Jan Kiszka   x86: Consolidate ...
2530
  	depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)
e279b6c1d   Sam Ravnborg   x86: start unific...
2531

3ef0e1f8c   Andres Salomon   x86: olpc: add On...
2532
  config PCI_OLPC
2bdd1b031   Andres Salomon   PCI/x86: fix up P...
2533
2534
  	def_bool y
  	depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
3ef0e1f8c   Andres Salomon   x86: olpc: add On...
2535

b5401a96b   Alex Nixon   xen/x86/PCI: Add ...
2536
2537
2538
2539
  config PCI_XEN
  	def_bool y
  	depends on PCI && XEN
  	select SWIOTLB_XEN
8364e1f83   Jan Kiszka   x86/jailhouse: Al...
2540
2541
2542
  config MMCONF_FAM10H
  	def_bool y
  	depends on X86_64 && PCI_MMCONFIG && ACPI
e279b6c1d   Sam Ravnborg   x86: start unific...
2543

3f6ea84a3   Ira W. Snyder   PCI: read memory ...
2544
  config PCI_CNB20LE_QUIRK
6a108a14f   David Rientjes   kconfig: rename C...
2545
  	bool "Read CNB20LE Host Bridge Windows" if EXPERT
6ea303864   Kees Cook   arch/x86: remove ...
2546
  	depends on PCI
3f6ea84a3   Ira W. Snyder   PCI: read memory ...
2547
2548
2549
2550
  	help
  	  Read the PCI windows out of the CNB20LE host bridge. This allows
  	  PCI hotplug to work on systems with the CNB20LE chipset which do
  	  not have ACPI.
64a5fed66   Bjorn Helgaas   x86/PCI: make Bro...
2551
2552
2553
2554
  	  There's no public spec for this chipset, and this functionality
  	  is known to be incomplete.
  
  	  You should say N unless you know you need this.
3a4955111   William Breathitt Gray   isa: Allow ISA-st...
2555
  config ISA_BUS
17a2a129b   William Breathitt Gray   isa: Remove ISA_B...
2556
  	bool "ISA bus support on modern systems" if EXPERT
3a4955111   William Breathitt Gray   isa: Allow ISA-st...
2557
  	help
17a2a129b   William Breathitt Gray   isa: Remove ISA_B...
2558
2559
2560
2561
2562
  	  Expose ISA bus device drivers and options available for selection and
  	  configuration. Enable this option if your target machine has an ISA
  	  bus. ISA is an older system, displaced by PCI and newer bus
  	  architectures -- if your target machine is modern, it probably does
  	  not have an ISA bus.
3a4955111   William Breathitt Gray   isa: Allow ISA-st...
2563
2564
  
  	  If unsure, say N.
1c00f0161   David Rientjes   x86: allow CONFIG...
2565
  # x86_64 have no ISA slots, but can have ISA-style DMA.
e279b6c1d   Sam Ravnborg   x86: start unific...
2566
  config ISA_DMA_API
1c00f0161   David Rientjes   x86: allow CONFIG...
2567
2568
2569
2570
2571
  	bool "ISA-style DMA support" if (X86_64 && EXPERT)
  	default y
  	help
  	  Enables ISA-style DMA support for devices requiring such controllers.
  	  If unsure, say Y.
e279b6c1d   Sam Ravnborg   x86: start unific...
2572

51e68d055   Linus Torvalds   x86 isa: add back...
2573
  if X86_32
e279b6c1d   Sam Ravnborg   x86: start unific...
2574
2575
  config ISA
  	bool "ISA support"
a7f7f6248   Masahiro Yamada   treewide: replace...
2576
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2577
2578
2579
2580
2581
  	  Find out whether you have ISA slots on your motherboard.  ISA is the
  	  name of a bus system, i.e. the way the CPU talks to the other stuff
  	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
  	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
  	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
e279b6c1d   Sam Ravnborg   x86: start unific...
2582
2583
  config SCx200
  	tristate "NatSemi SCx200 support"
a7f7f6248   Masahiro Yamada   treewide: replace...
2584
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2585
2586
2587
2588
2589
2590
2591
2592
2593
  	  This provides basic support for National Semiconductor's
  	  (now AMD's) Geode processors.  The driver probes for the
  	  PCI-IDs of several on-chip devices, so its a good dependency
  	  for other scx200_* drivers.
  
  	  If compiled as a module, the driver is named scx200.
  
  config SCx200HR_TIMER
  	tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
592913ecb   John Stultz   time: Kill off CO...
2594
  	depends on SCx200
e279b6c1d   Sam Ravnborg   x86: start unific...
2595
  	default y
a7f7f6248   Masahiro Yamada   treewide: replace...
2596
  	help
e279b6c1d   Sam Ravnborg   x86: start unific...
2597
2598
2599
2600
2601
  	  This driver provides a clocksource built upon the on-chip
  	  27MHz high-resolution timer.  Its also a workaround for
  	  NSC Geode SC-1100's buggy TSC, which loses time when the
  	  processor goes idle (as is done by the scheduler).  The
  	  other workaround is idle=poll boot option.
3ef0e1f8c   Andres Salomon   x86: olpc: add On...
2602
2603
  config OLPC
  	bool "One Laptop Per Child support"
540089798   Thomas Gleixner   x86: OLPC: Remove...
2604
  	depends on !X86_PAE
3c5549467   Andres Salomon   ALSA: cs5535audio...
2605
  	select GPIOLIB
dc3119e70   Thomas Gleixner   x86: OLPC: Cleanu...
2606
  	select OF
45bb1674b   Daniel Drake   x86, olpc: Use de...
2607
  	select OF_PROMTREE
b4e518547   Grant Likely   irq_domain/x86: C...
2608
  	select IRQ_DOMAIN
0c3d931b3   Lubomir Rintel   Platform: OLPC: A...
2609
  	select OLPC_EC
a7f7f6248   Masahiro Yamada   treewide: replace...
2610
  	help
3ef0e1f8c   Andres Salomon   x86: olpc: add On...
2611
2612
  	  Add support for detecting the unique features of the OLPC
  	  XO hardware.
a3128588b   Daniel Drake   x86, olpc: Rename...
2613
2614
  config OLPC_XO1_PM
  	bool "OLPC XO-1 Power Management"
fa112cf1e   Borislav Petkov   x86/olpc: Fix bui...
2615
  	depends on OLPC && MFD_CS5535=y && PM_SLEEP
a7f7f6248   Masahiro Yamada   treewide: replace...
2616
  	help
97c4cb71c   Daniel Drake   x86, olpc: Add XO...
2617
  	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
bf1ebf007   Daniel Drake   x86, olpc: Add XO...
2618

cfee95977   Daniel Drake   x86, olpc: Add XO...
2619
2620
2621
  config OLPC_XO1_RTC
  	bool "OLPC XO-1 Real Time Clock"
  	depends on OLPC_XO1_PM && RTC_DRV_CMOS
a7f7f6248   Masahiro Yamada   treewide: replace...
2622
  	help
cfee95977   Daniel Drake   x86, olpc: Add XO...
2623
2624
  	  Add support for the XO-1 real time clock, which can be used as a
  	  programmable wakeup source.
7feda8e9f   Daniel Drake   x86, olpc: Add XO...
2625
2626
  config OLPC_XO1_SCI
  	bool "OLPC XO-1 SCI extras"
92e830f25   Arnd Bergmann   x86/olpc: Fix inc...
2627
  	depends on OLPC && OLPC_XO1_PM && GPIO_CS5535=y
ed8e47fef   Randy Dunlap   x86/olpc: Fix olp...
2628
  	depends on INPUT=y
d8d01a637   Daniel Drake   x86, olpc: Fix de...
2629
  	select POWER_SUPPLY
a7f7f6248   Masahiro Yamada   treewide: replace...
2630
  	help
7feda8e9f   Daniel Drake   x86, olpc: Add XO...
2631
  	  Add support for SCI-based features of the OLPC XO-1 laptop:
7bc74b3df   Daniel Drake   x86, olpc-xo1-sci...
2632
  	   - EC-driven system wakeups
7feda8e9f   Daniel Drake   x86, olpc: Add XO...
2633
  	   - Power button
7bc74b3df   Daniel Drake   x86, olpc-xo1-sci...
2634
  	   - Ebook switch
2cf2baea1   Daniel Drake   x86, olpc-xo1-sci...
2635
  	   - Lid switch
e1040ac69   Daniel Drake   x86, olpc-xo1-sci...
2636
2637
  	   - AC adapter status updates
  	   - Battery status updates
7feda8e9f   Daniel Drake   x86, olpc: Add XO...
2638

a0f30f592   Daniel Drake   x86, olpc: Add XO...
2639
2640
  config OLPC_XO15_SCI
  	bool "OLPC XO-1.5 SCI extras"
d8d01a637   Daniel Drake   x86, olpc: Fix de...
2641
2642
  	depends on OLPC && ACPI
  	select POWER_SUPPLY
a7f7f6248   Masahiro Yamada   treewide: replace...
2643
  	help
a0f30f592   Daniel Drake   x86, olpc: Add XO...
2644
2645
2646
2647
  	  Add support for SCI-based features of the OLPC XO-1.5 laptop:
  	   - EC-driven system wakeups
  	   - AC adapter status updates
  	   - Battery status updates
bf1ebf007   Daniel Drake   x86, olpc: Add XO...
2648

d4f3e3501   Ed Wildgoose   x86: geode: New P...
2649
2650
2651
  config ALIX
  	bool "PCEngines ALIX System Support (LED setup)"
  	select GPIOLIB
a7f7f6248   Masahiro Yamada   treewide: replace...
2652
  	help
d4f3e3501   Ed Wildgoose   x86: geode: New P...
2653
2654
2655
2656
2657
2658
2659
2660
2661
  	  This option enables system support for the PCEngines ALIX.
  	  At present this just sets up LEDs for GPIO control on
  	  ALIX2/3/6 boards.  However, other system specific setup should
  	  get added here.
  
  	  Note: You must still enable the drivers for GPIO and LED support
  	  (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
  
  	  Note: You have to set alix.force=1 for boards with Award BIOS.
da4e33029   Philip Prindeville   x86/geode/net5501...
2662
2663
2664
  config NET5501
  	bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
  	select GPIOLIB
a7f7f6248   Masahiro Yamada   treewide: replace...
2665
  	help
da4e33029   Philip Prindeville   x86/geode/net5501...
2666
  	  This option enables system support for the Soekris Engineering net5501.
3197059af   Philip A. Prindeville   geos: Platform dr...
2667
2668
2669
2670
  config GEOS
  	bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
  	select GPIOLIB
  	depends on DMI
a7f7f6248   Masahiro Yamada   treewide: replace...
2671
  	help
3197059af   Philip A. Prindeville   geos: Platform dr...
2672
  	  This option enables system support for the Traverse Technologies GEOS.
7d0291256   Vivien Didelot   x86: Add TS-5500 ...
2673
2674
2675
2676
2677
2678
  config TS5500
  	bool "Technologic Systems TS-5500 platform support"
  	depends on MELAN
  	select CHECK_SIGNATURE
  	select NEW_LEDS
  	select LEDS_CLASS
a7f7f6248   Masahiro Yamada   treewide: replace...
2679
  	help
7d0291256   Vivien Didelot   x86: Add TS-5500 ...
2680
  	  This option enables system support for the Technologic Systems TS-5500.
bc0120fdb   Sam Ravnborg   x86: copy x86_64 ...
2681
  endif # X86_32
23ac4ae82   Andreas Herrmann   x86, k8: Rename k...
2682
  config AMD_NB
e279b6c1d   Sam Ravnborg   x86: start unific...
2683
  	def_bool y
0e152cd7c   Borislav Petkov   x86, k8 nb: Fix b...
2684
  	depends on CPU_SUP_AMD && PCI
e279b6c1d   Sam Ravnborg   x86: start unific...
2685

e3263ab38   David Herrmann   x86: provide plat...
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
  config X86_SYSFB
  	bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
  	help
  	  Firmwares often provide initial graphics framebuffers so the BIOS,
  	  bootloader or kernel can show basic video-output during boot for
  	  user-guidance and debugging. Historically, x86 used the VESA BIOS
  	  Extensions and EFI-framebuffers for this, which are mostly limited
  	  to x86.
  	  This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
  	  framebuffers so the new generic system-framebuffer drivers can be
  	  used on x86. If the framebuffer is not compatible with the generic
e3a5dc087   Nikolas Nyby   x86/Kconfig: Fix ...
2697
  	  modes, it is advertised as fallback platform framebuffer so legacy
e3263ab38   David Herrmann   x86: provide plat...
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
  	  drivers like efifb, vesafb and uvesafb can pick it up.
  	  If this option is not selected, all system framebuffers are always
  	  marked as fallback platform framebuffers as usual.
  
  	  Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
  	  not be able to pick up generic system framebuffers if this option
  	  is selected. You are highly encouraged to enable simplefb as
  	  replacement if you select this option. simplefb can correctly deal
  	  with generic system framebuffers. But you should still keep vesafb
  	  and others enabled as fallback if a system framebuffer is
  	  incompatible with simplefb.
  
  	  If unsure, say Y.
e279b6c1d   Sam Ravnborg   x86: start unific...
2711
  endmenu
1572497cb   Christoph Hellwig   kconfig: include ...
2712
  menu "Binary Emulations"
e279b6c1d   Sam Ravnborg   x86: start unific...
2713
2714
2715
2716
  
  config IA32_EMULATION
  	bool "IA32 Emulation"
  	depends on X86_64
39f88911b   Ingo Molnar   x86/kconfig: Clea...
2717
  	select ARCH_WANT_OLD_COMPAT_IPC
d1603990e   Randy Dunlap   x86: fix build er...
2718
  	select BINFMT_ELF
a97f52e67   Roland McGrath   x86: compat_binfm...
2719
  	select COMPAT_BINFMT_ELF
39f88911b   Ingo Molnar   x86/kconfig: Clea...
2720
  	select COMPAT_OLD_SIGACTION
a7f7f6248   Masahiro Yamada   treewide: replace...
2721
  	help
5fd92e65a   H. J. Lu   x32: Allow x32 to...
2722
2723
2724
  	  Include code to run legacy 32-bit programs under a
  	  64-bit kernel. You should likely turn this on, unless you're
  	  100% sure that you don't have any 32-bit programs left.
e279b6c1d   Sam Ravnborg   x86: start unific...
2725
2726
  
  config IA32_AOUT
8f9ca475c   Ingo Molnar   x86: clean up arc...
2727
2728
  	tristate "IA32 a.out support"
  	depends on IA32_EMULATION
eac616557   Borislav Petkov   x86: Deprecate a....
2729
  	depends on BROKEN
a7f7f6248   Masahiro Yamada   treewide: replace...
2730
  	help
8f9ca475c   Ingo Molnar   x86: clean up arc...
2731
  	  Support old a.out binaries in the 32bit emulation.
e279b6c1d   Sam Ravnborg   x86: start unific...
2732

0bf627639   H. Peter Anvin   x32: Warn and dis...
2733
  config X86_X32
6ea303864   Kees Cook   arch/x86: remove ...
2734
  	bool "x32 ABI for 64-bit mode"
9b54050bf   Brian Gerst   x86/compat: Separ...
2735
  	depends on X86_64
a7f7f6248   Masahiro Yamada   treewide: replace...
2736
  	help
5fd92e65a   H. J. Lu   x32: Allow x32 to...
2737
2738
2739
2740
2741
2742
2743
2744
  	  Include code to run binaries for the x32 native 32-bit ABI
  	  for 64-bit processors.  An x32 process gets access to the
  	  full 64-bit register file and wide data path while leaving
  	  pointers at 32 bits for smaller memory footprint.
  
  	  You will need a recent binutils (2.22 or later) with
  	  elf32_x86_64 support enabled to compile a kernel with this
  	  option set.
953fee1d8   Ingo Molnar   x86/kconfig: Clea...
2745
2746
2747
2748
2749
  config COMPAT_32
  	def_bool y
  	depends on IA32_EMULATION || X86_32
  	select HAVE_UID16
  	select OLD_SIGSUSPEND3
e279b6c1d   Sam Ravnborg   x86: start unific...
2750
  config COMPAT
3c2362e62   Harvey Harrison   x86: use def_bool...
2751
  	def_bool y
0bf627639   H. Peter Anvin   x32: Warn and dis...
2752
  	depends on IA32_EMULATION || X86_X32
e279b6c1d   Sam Ravnborg   x86: start unific...
2753

3120e25ef   Jan Beulich   x86/Kconfig: Clea...
2754
  if COMPAT
e279b6c1d   Sam Ravnborg   x86: start unific...
2755
  config COMPAT_FOR_U64_ALIGNMENT
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
2756
  	def_bool y
e279b6c1d   Sam Ravnborg   x86: start unific...
2757
2758
  
  config SYSVIPC_COMPAT
3c2362e62   Harvey Harrison   x86: use def_bool...
2759
  	def_bool y
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
2760
  	depends on SYSVIPC
3120e25ef   Jan Beulich   x86/Kconfig: Clea...
2761
  endif
ee009e4a0   David Howells   KEYS: Add an iove...
2762

e279b6c1d   Sam Ravnborg   x86: start unific...
2763
  endmenu
e5beae169   Keith Packard   io mapping: clean...
2764
2765
2766
  config HAVE_ATOMIC_IOMAP
  	def_bool y
  	depends on X86_32
e279b6c1d   Sam Ravnborg   x86: start unific...
2767
  source "drivers/firmware/Kconfig"
edf884172   Avi Kivity   KVM: Move arch de...
2768
  source "arch/x86/kvm/Kconfig"
5e8ebd841   Jason A. Donenfeld   x86: probe assemb...
2769
2770
  
  source "arch/x86/Kconfig.assembler"