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arch/x86/Kconfig.cpu
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# Put here option for CPU selection and depending optimization if !X86_ELAN choice prompt "Processor family" |
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default M686 if X86_32 default GENERIC_CPU if X86_64 |
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config M386 bool "386" |
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depends on X86_32 && !UML |
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---help--- This is the processor type of your CPU. This information is used for optimizing purposes. In order to compile a kernel that can run on all x86 CPU types (albeit not optimally fast), you can specify "386" here. The kernel will not necessarily run on earlier architectures than the one you have chosen, e.g. a Pentium optimized kernel will run on a PPro, but not necessarily on a i486. Here are the settings recommended for greatest speed: - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI |
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486DLC/DLC2, and UMC 486SX-S. Only "386" kernels will run on a 386 class machine. |
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- "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. - "586" for generic Pentium CPUs lacking the TSC (time stamp counter) register. - "Pentium-Classic" for the Intel Pentium. - "Pentium-MMX" for the Intel Pentium MMX. - "Pentium-Pro" for the Intel Pentium Pro. - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). - "Crusoe" for the Transmeta Crusoe series. - "Efficeon" for the Transmeta Efficeon series. - "Winchip-C6" for original IDT Winchip. |
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- "Winchip-2" for IDT Winchips with 3dNow! capabilities. |
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- "GeodeGX1" for Geode GX1 (Cyrix MediaGX). |
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- "Geode GX/LX" For AMD Geode GX and LX processors. |
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- "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. |
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- "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). |
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- "VIA C7" for VIA C7. |
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If you don't know what to do, choose "386". config M486 bool "486" |
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depends on X86_32 |
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---help--- |
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Select this for a 486 series processor, either Intel or one of the compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX, DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. config M586 bool "586/K5/5x86/6x86/6x86MX" |
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depends on X86_32 |
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---help--- |
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Select this for an 586 or 686 series processor such as the AMD K5, the Cyrix 5x86, 6x86 and 6x86MX. This choice does not assume the RDTSC (Read Time Stamp Counter) instruction. config M586TSC bool "Pentium-Classic" |
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depends on X86_32 |
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---help--- |
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Select this for a Pentium Classic processor with the RDTSC (Read Time Stamp Counter) instruction for benchmarking. config M586MMX bool "Pentium-MMX" |
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depends on X86_32 |
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---help--- |
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Select this for a Pentium with the MMX graphics/multimedia extended instructions. config M686 bool "Pentium-Pro" |
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depends on X86_32 |
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---help--- |
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Select this for Intel Pentium Pro chips. This enables the use of Pentium Pro extended instructions, and disables the init-time guard against the f00f bug found in earlier Pentiums. config MPENTIUMII bool "Pentium-II/Celeron(pre-Coppermine)" |
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depends on X86_32 |
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---help--- |
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Select this for Intel chips based on the Pentium-II and pre-Coppermine Celeron core. This option enables an unaligned copy optimization, compiles the kernel with optimization flags tailored for the chip, and applies any applicable Pentium Pro optimizations. config MPENTIUMIII bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon" |
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depends on X86_32 |
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---help--- |
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Select this for Intel chips based on the Pentium-III and Celeron-Coppermine core. This option enables use of some extended prefetch instructions in addition to the Pentium II extensions. config MPENTIUMM bool "Pentium M" |
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depends on X86_32 |
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---help--- |
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Select this for Intel Pentium M (not Pentium-4 M) notebook chips. config MPENTIUM4 |
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bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" |
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depends on X86_32 |
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---help--- |
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Select this for Intel Pentium 4 chips. This includes the |
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Pentium 4, Pentium D, P4-based Celeron and Xeon, and Pentium-4 M (not Pentium M) chips. This option enables compile flags optimized for the chip, uses the correct cache line size, and applies any applicable optimizations. CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 ) Select this for: Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename: -Willamette -Northwood -Mobile Pentium 4 -Mobile Pentium 4 M -Extreme Edition (Gallatin) -Prescott -Prescott 2M -Cedar Mill -Presler -Smithfiled Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename: -Foster -Prestonia -Gallatin -Nocona -Irwindale -Cranford -Potomac -Paxville -Dempsey |
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config MK6 bool "K6/K6-II/K6-III" |
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depends on X86_32 |
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---help--- |
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Select this for an AMD K6-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. config MK7 bool "Athlon/Duron/K7" |
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depends on X86_32 |
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---help--- |
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Select this for an AMD Athlon K7-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. config MK8 bool "Opteron/Athlon64/Hammer/K8" |
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---help--- |
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Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. |
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config MCRUSOE bool "Crusoe" |
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depends on X86_32 |
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---help--- |
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Select this for a Transmeta Crusoe processor. Treats the processor like a 586 with TSC, and sets some GCC optimization flags (like a Pentium Pro with no alignment requirements). config MEFFICEON bool "Efficeon" |
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depends on X86_32 |
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---help--- |
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Select this for a Transmeta Efficeon processor. config MWINCHIPC6 bool "Winchip-C6" |
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---help--- |
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Select this for an IDT Winchip C6 chip. Linux and GCC treat this chip as a 586TSC with some extended instructions and alignment requirements. |
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config MWINCHIP3D |
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bool "Winchip-2/Winchip-2A/Winchip-3" |
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depends on X86_32 |
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---help--- |
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Select this for an IDT Winchip-2, 2A or 3. Linux and GCC |
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treat this chip as a 586TSC with some extended instructions |
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and alignment requirements. Also enable out of order memory |
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stores for this CPU, which can increase performance of some operations. config MGEODEGX1 bool "GeodeGX1" |
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depends on X86_32 |
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---help--- |
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Select this for a Geode GX1 (Cyrix MediaGX) chip. |
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config MGEODE_LX |
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bool "Geode GX/LX" |
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depends on X86_32 |
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---help--- |
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Select this for AMD Geode GX and LX processors. |
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config MCYRIXIII bool "CyrixIII/VIA-C3" |
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depends on X86_32 |
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---help--- |
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Select this for a Cyrix III or C3 chip. Presently Linux and GCC treat this chip as a generic 586. Whilst the CPU is 686 class, it lacks the cmov extension which gcc assumes is present when generating 686 code. Note that Nehemiah (Model 9) and above will not boot with this kernel due to them lacking the 3DNow! instructions used in earlier incarnations of the CPU. config MVIAC3_2 bool "VIA C3-2 (Nehemiah)" |
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depends on X86_32 |
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---help--- |
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Select this for a VIA C3 "Nehemiah". Selecting this enables usage of SSE and tells gcc to treat the CPU as a 686. Note, this kernel will not boot on older (pre model 9) C3s. |
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config MVIAC7 bool "VIA C7" |
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depends on X86_32 |
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---help--- |
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Select this for a VIA C7. Selecting this uses the correct cache shift and tells gcc to treat the CPU as a 686. |
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config MPSC bool "Intel P4 / older Netburst based Xeon" depends on X86_64 |
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---help--- |
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Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey Xeon CPUs with Intel 64bit which is compatible with x86-64. Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the |
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Netburst core and shouldn't use this option. You can distinguish them |
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using the cpu family field in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. config MCORE2 bool "Core 2/newer Xeon" |
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---help--- |
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Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx) CPUs. You can distinguish newer from older Xeons by the CPU family in /proc/cpuinfo. Newer ones have 6 and older ones 15 (not a typo) |
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config MATOM bool "Intel Atom" ---help--- Select this for the Intel Atom platform. Intel Atom CPUs have an in-order pipelining architecture and thus can benefit from accordingly optimized code. Use a recent GCC with specific Atom support in order to fully benefit from selecting this option. |
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config GENERIC_CPU bool "Generic-x86-64" depends on X86_64 |
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---help--- |
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Generic x86-64 CPU. Run equally well on all x86-64 CPUs. |
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endchoice config X86_GENERIC |
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bool "Generic x86 support" depends on X86_32 |
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---help--- |
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Instead of just including optimizations for the selected x86 variant (e.g. PII, Crusoe or Athlon), include some more generic optimizations as well. This will make the kernel perform better on x86 CPUs other than that selected. This is really intended for distributors who need more generic optimizations. endif |
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config X86_CPU def_bool y select GENERIC_FIND_FIRST_BIT select GENERIC_FIND_NEXT_BIT |
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# # Define implied options from the CPU selection here |
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config X86_INTERNODE_CACHE_SHIFT |
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int |
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default "12" if X86_VSMP default "7" if NUMA default X86_L1_CACHE_SHIFT |
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config X86_CMPXCHG |
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def_bool X86_64 || (X86_32 && !M386) |
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config X86_L1_CACHE_SHIFT int |
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default "7" if MPENTIUM4 || MPSC |
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default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU |
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default "4" if X86_ELAN || M486 || M386 || MGEODEGX1 |
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default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX |
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config X86_XADD |
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def_bool y |
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depends on X86_64 || !M386 |
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config X86_PPRO_FENCE |
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bool "PentiumPro memory ordering errata workaround" |
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depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1 |
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---help--- |
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Old PentiumPro multiprocessor systems had errata that could cause memory operations to violate the x86 ordering standard in rare cases. Enabling this option will attempt to work around some (but not all) occurances of this problem, at the cost of much heavier spinlock and memory barrier operations. If unsure, say n here. Even distro kernels should think twice before enabling this: there are few systems, and an unlikely bug. |
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config X86_F00F_BUG |
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def_bool y |
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depends on M586MMX || M586TSC || M586 || M486 || M386 |
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config X86_INVD_BUG def_bool y depends on M486 || M386 |
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config X86_WP_WORKS_OK |
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def_bool y |
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depends on !M386 |
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config X86_INVLPG |
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def_bool y |
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depends on X86_32 && !M386 |
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config X86_BSWAP |
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def_bool y |
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depends on X86_32 && !M386 |
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config X86_POPAD_OK |
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def_bool y |
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depends on X86_32 && !M386 |
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config X86_ALIGNMENT_16 |
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def_bool y |
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depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1 |
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config X86_INTEL_USERCOPY |
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def_bool y |
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depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 |
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config X86_USE_PPRO_CHECKSUM |
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def_bool y |
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depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM |
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config X86_USE_3DNOW |
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def_bool y |
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depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML |
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config X86_OOSTORE |
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def_bool y |
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depends on (MWINCHIP3D || MWINCHIPC6) && MTRR |
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# # P6_NOPs are a relatively minor optimization that require a family >= # 6 processor, except that it is broken on certain VIA chips. # Furthermore, AMD chips prefer a totally different sequence of NOPs |
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# (which work on all CPUs). In addition, it looks like Virtual PC # does not understand them. # # As a result, disallow these if we're not compiling for X86_64 (these # NOPs do work on all x86-64 capable chips); the list of processors in # the right-hand clause are the cores that benefit from this optimization. |
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# |
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config X86_P6_NOP def_bool y |
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depends on X86_64 depends on (MCORE2 || MPENTIUM4 || MPSC) |
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config X86_TSC |
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def_bool y |
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depends on ((MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MATOM) && !X86_NUMAQ) || X86_64 |
c7f81c945 [PATCH] i386: Ver... |
390 |
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f8096f92b x86: separate cmp... |
391 392 |
config X86_CMPXCHG64 def_bool y |
db677ffa5 Revert "x86: Side... |
393 |
depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM |
f8096f92b x86: separate cmp... |
394 |
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c7f81c945 [PATCH] i386: Ver... |
395 396 397 |
# this should be set for all -march=.. options where the compiler # generates cmov. config X86_CMOV |
96daa8cd5 x86: use def_bool... |
398 |
def_bool y |
98059e346 x86: AMD Geode LX... |
399 |
depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) |
c7f81c945 [PATCH] i386: Ver... |
400 |
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de32e0417 x86 Kconfig: chan... |
401 |
config X86_MINIMUM_CPU_FAMILY |
c7f81c945 [PATCH] i386: Ver... |
402 |
int |
1032c0ba9 x86: arch/x86/Kco... |
403 |
default "64" if X86_64 |
7343b3b3a x86: require fami... |
404 |
default "6" if X86_32 && X86_P6_NOP |
982d007a6 x86: Optimize cmp... |
405 |
default "5" if X86_32 && X86_CMPXCHG64 |
1032c0ba9 x86: arch/x86/Kco... |
406 |
default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK) |
de32e0417 x86 Kconfig: chan... |
407 |
default "3" |
c7f81c945 [PATCH] i386: Ver... |
408 |
|
0a049bb0a x86: debugctlmsr ... |
409 |
config X86_DEBUGCTLMSR |
96daa8cd5 x86: use def_bool... |
410 |
def_bool y |
5641f1fde X86_DEBUGCTLMSR w... |
411 |
depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML |
8d02c2110 x86: configuratio... |
412 413 |
menuconfig PROCESSOR_SELECT |
8d02c2110 x86: configuratio... |
414 |
bool "Supported processor vendors" if EMBEDDED |
8f9ca475c x86: clean up arc... |
415 |
---help--- |
8d02c2110 x86: configuratio... |
416 417 |
This lets you choose what x86 vendor support code your kernel will include. |
879d792b6 x86: let intel 64... |
418 |
config CPU_SUP_INTEL |
8d02c2110 x86: configuratio... |
419 420 |
default y bool "Support Intel processors" if PROCESSOR_SELECT |
8f9ca475c x86: clean up arc... |
421 |
---help--- |
b7b3a4253 x86: extend proce... |
422 423 424 425 426 427 428 429 |
This enables detection, tunings and quirks for Intel processors You need this enabled if you want your kernel to run on an Intel CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on an Intel CPU might render the kernel unbootable. If unsure, say N. |
8d02c2110 x86: configuratio... |
430 431 432 433 434 |
config CPU_SUP_CYRIX_32 default y bool "Support Cyrix processors" if PROCESSOR_SELECT depends on !64BIT |
8f9ca475c x86: clean up arc... |
435 |
---help--- |
b7b3a4253 x86: extend proce... |
436 437 438 439 440 441 442 443 |
This enables detection, tunings and quirks for Cyrix processors You need this enabled if you want your kernel to run on a Cyrix CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a Cyrix CPU might render the kernel unbootable. If unsure, say N. |
8d02c2110 x86: configuratio... |
444 |
|
ff73152ce x86: make 64 bit ... |
445 |
config CPU_SUP_AMD |
8d02c2110 x86: configuratio... |
446 447 |
default y bool "Support AMD processors" if PROCESSOR_SELECT |
8f9ca475c x86: clean up arc... |
448 |
---help--- |
b7b3a4253 x86: extend proce... |
449 450 451 452 453 454 455 456 |
This enables detection, tunings and quirks for AMD processors You need this enabled if you want your kernel to run on an AMD CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on an AMD CPU might render the kernel unbootable. If unsure, say N. |
8d02c2110 x86: configuratio... |
457 |
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48f4c485c x86/centaur: merg... |
458 |
config CPU_SUP_CENTAUR |
8d02c2110 x86: configuratio... |
459 460 |
default y bool "Support Centaur processors" if PROCESSOR_SELECT |
8f9ca475c x86: clean up arc... |
461 |
---help--- |
b7b3a4253 x86: extend proce... |
462 463 464 465 466 467 468 469 |
This enables detection, tunings and quirks for Centaur processors You need this enabled if you want your kernel to run on a Centaur CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a Centaur CPU might render the kernel unbootable. If unsure, say N. |
8d02c2110 x86: configuratio... |
470 471 472 473 474 |
config CPU_SUP_TRANSMETA_32 default y bool "Support Transmeta processors" if PROCESSOR_SELECT depends on !64BIT |
8f9ca475c x86: clean up arc... |
475 |
---help--- |
b7b3a4253 x86: extend proce... |
476 477 478 479 480 481 482 483 |
This enables detection, tunings and quirks for Transmeta processors You need this enabled if you want your kernel to run on a Transmeta CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a Transmeta CPU might render the kernel unbootable. If unsure, say N. |
8d02c2110 x86: configuratio... |
484 485 486 487 488 |
config CPU_SUP_UMC_32 default y bool "Support UMC processors" if PROCESSOR_SELECT depends on !64BIT |
8f9ca475c x86: clean up arc... |
489 |
---help--- |
b7b3a4253 x86: extend proce... |
490 491 492 493 494 495 496 497 |
This enables detection, tunings and quirks for UMC processors You need this enabled if you want your kernel to run on a UMC CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a UMC CPU might render the kernel unbootable. If unsure, say N. |