menu "Kernel hacking"
  
  source "lib/Kconfig.debug"

  config PPC_DISABLE_WERROR
  	bool "Don't build arch/powerpc code with -Werror"
  	default n
  	help
  	  This option tells the compiler NOT to build the code under
  	  arch/powerpc with the -Werror flag (which means warnings
  	  are treated as errors).
  
  	  Only enable this if you are hitting a build failure in the
  	  arch/powerpc code caused by a warning, and you don't feel
  	  inclined to fix it.
  
  config PPC_WERROR
  	bool
  	depends on !PPC_DISABLE_WERROR
  	default y

  config PRINT_STACK_DEPTH
  	int "Stack depth to print" if DEBUG_KERNEL
  	default 64
  	help
  	  This option allows you to set the stack depth that the kernel
  	  prints in stack traces. This can be useful if your display is
  	  too small and stack traces cause important information to
  	  scroll off the screen.

  config DEBUG_STACKOVERFLOW
  	bool "Check for stack overflows"

  	depends on DEBUG_KERNEL

  	help
  	  This option will cause messages to be printed if free stack space
  	  drops below a certain limit.

  config DEBUG_STACK_USAGE
  	bool "Stack utilization instrumentation"

  	depends on DEBUG_KERNEL

  	help
  	  Enables the display of the minimum amount of free stack which each
  	  task has ever had available in the sysrq-T and sysrq-P debug output.
  
  	  This option will slow down process creation somewhat.

  config HCALL_STATS
  	bool "Hypervisor call instrumentation"

  	depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS

  	help
  	  Adds code to keep track of the number of hypervisor calls made and

  	  the amount of time spent in hypervisor calls.  Wall time spent in

  	  each call is always calculated, and if available CPU cycles spent
  	  are also calculated.  A directory named hcall_inst is added at the
  	  root of the debugfs filesystem.  Within the hcall_inst directory
  	  are files that contain CPU specific call statistics.
  
  	  This option will add a small amount of overhead to all hypervisor
  	  calls.

  config PPC_EMULATED_STATS
  	bool "Emulated instructions tracking"
  	depends on DEBUG_FS
  	help
  	  Adds code to keep track of the number of instructions that are
  	  emulated by the in-kernel emulator. Counters for the various classes
  	  of emulated instructions are available under
  	  powerpc/emulated_instructions/ in the root of the debugfs file
  	  system. Optionally (controlled by
  	  powerpc/emulated_instructions/do_warn in debugfs), rate-limited
  	  warnings can be printed to the console when instructions are
  	  emulated.

  config CODE_PATCHING_SELFTEST
  	bool "Run self-tests of the code-patching code."
  	depends on DEBUG_KERNEL
  	default n

  config FTR_FIXUP_SELFTEST
  	bool "Run self-tests of the feature-fixup code."
  	depends on DEBUG_KERNEL
  	default n

  config MSI_BITMAP_SELFTEST
  	bool "Run self-tests of the MSI bitmap code."
  	depends on DEBUG_KERNEL
  	default n

  config XMON
  	bool "Include xmon kernel debugger"

  	depends on DEBUG_KERNEL

  	help
  	  Include in-kernel hooks for the xmon kernel monitor/debugger.
  	  Unless you are intending to debug the kernel, say N here.

  	  Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
  	  nothing will appear on the screen (xmon writes directly to the
  	  framebuffer memory).
  	  The cmdline option 'xmon' or 'xmon=early' will drop into xmon
  	  very early during boot. 'xmon=on' will just enable the xmon
  	  debugger hooks.  'xmon=off' will disable the debugger hooks
  	  if CONFIG_XMON_DEFAULT is set.

  	  xmon will print a backtrace on the very first invocation.
  	  'xmon=nobt' will disable this autobacktrace.

  
  config XMON_DEFAULT
  	bool "Enable xmon by default"
  	depends on XMON
  	help
  	  xmon is normally disabled unless booted with 'xmon=on'.
  	  Use 'xmon=off' to disable xmon init during runtime.

  config XMON_DISASSEMBLY
  	bool "Include disassembly support in xmon"
  	depends on XMON
  	default y
  	help
  	  Include support for disassembling in xmon. You probably want
  	  to say Y here, unless you're building for a memory-constrained
  	  system.

  config DEBUGGER
  	bool
  	depends on KGDB || XMON
  	default y

  config IRQSTACKS
  	bool "Use separate kernel stacks when processing interrupts"

  	help
  	  If you say Y here the kernel will use separate kernel stacks
  	  for handling hard and soft interrupts.  This can help avoid
  	  overflowing the process kernel stacks.

  config VIRQ_DEBUG
  	bool "Expose hardware/virtual IRQ mapping via debugfs"

  	depends on DEBUG_FS

  	help
  	  This option will show the mapping relationship between hardware irq
  	  numbers and virtual irq numbers. The mapping is exposed via debugfs
  	  in the file powerpc/virq_mapping.
  
  	  If you don't know what this means you don't need it.

  config BDI_SWITCH
  	bool "Include BDI-2000 user context switcher"

  	depends on DEBUG_KERNEL && PPC32

  	help
  	  Include in-kernel support for the Abatron BDI2000 debugger.
  	  Unless you are intending to debug the kernel with one of these
  	  machines, say N here.
  
  config BOOTX_TEXT
  	bool "Support for early boot text console (BootX or OpenFirmware only)"

  	depends on PPC_OF && PPC_BOOK3S

  	help
  	  Say Y here to see progress messages from the boot firmware in text
  	  mode. Requires either BootX or Open Firmware.

  config PPC_EARLY_DEBUG
  	bool "Early debugging (dangerous)"

  	# PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
  	# mark, which doesn't work with current 440 KVM.
  	depends on !KVM

  	help
  	  Say Y to enable some early debugging facilities that may be available
  	  for your processor/board combination. Those facilities are hacks
  	  intended to debug problems early during boot, this should not be
  	  enabled in a production kernel.
  	  Note that enabling this will also cause the kernel default log level
  	  to be pushed to max automatically very early during boot

  choice

  	prompt "Early debugging console"
  	depends on PPC_EARLY_DEBUG

  	help

  	  Use the selected console for early debugging. Careful, if you
  	  enable debugging for the wrong type of machine your kernel
  	  _will not boot_.

  
  config PPC_EARLY_DEBUG_LPAR
  	bool "LPAR HV Console"
  	depends on PPC_PSERIES
  	help
  	  Select this to enable early debugging for a machine with a HVC
  	  console on vterm 0.
  
  config PPC_EARLY_DEBUG_G5
  	bool "Apple G5"
  	depends on PPC_PMAC64
  	help
  	  Select this to enable early debugging for Apple G5 machines.

  config PPC_EARLY_DEBUG_RTAS_PANEL

  	bool "RTAS Panel"
  	depends on PPC_RTAS
  	help
  	  Select this to enable early debugging via the RTAS panel.

  config PPC_EARLY_DEBUG_RTAS_CONSOLE
  	bool "RTAS Console"
  	depends on PPC_RTAS
  	select UDBG_RTAS_CONSOLE
  	help
  	  Select this to enable early debugging via the RTAS console.

  config PPC_EARLY_DEBUG_MAPLE
  	bool "Maple real mode"
  	depends on PPC_MAPLE
  	help
  	  Select this to enable early debugging for Maple.
  
  config PPC_EARLY_DEBUG_ISERIES
  	bool "iSeries HV Console"
  	depends on PPC_ISERIES
  	help
  	  Select this to enable early debugging for legacy iSeries. You need
  	  to hit "Ctrl-x Ctrl-x" to see the messages on the console.

  config PPC_EARLY_DEBUG_PAS_REALMODE
  	bool "PA Semi real mode"
  	depends on PPC_PASEMI
  	help
  	  Select this to enable early debugging for PA Semi.
  	  Output will be on UART0.

  config PPC_EARLY_DEBUG_BEAT
  	bool "Beat HV Console"
  	depends on PPC_CELLEB
  	select PPC_UDBG_BEAT
  	help
  	  Select this to enable early debugging for Celleb with Beat.

  config PPC_EARLY_DEBUG_44x
  	bool "Early serial debugging for IBM/AMCC 44x CPUs"
  	depends on 44x

  	help
  	  Select this to enable early debugging for IBM 44x chips via the

  	  inbuilt serial port.  If you enable this, ensure you set
            PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.

  config PPC_EARLY_DEBUG_40x
  	bool "Early serial debugging for IBM/AMCC 40x CPUs"
  	depends on 40x
  	help
  	  Select this to enable early debugging for IBM 40x chips via the
  	  inbuilt serial port. This works on chips with a 16550 compatible
  	  UART. Xilinx chips with uartlite cannot use this option.

  config PPC_EARLY_DEBUG_CPM
  	bool "Early serial debugging for Freescale CPM-based serial ports"
  	depends on SERIAL_CPM
  	select PIN_TLB if PPC_8xx
  	help
  	  Select this to enable early debugging for Freescale chips
  	  using a CPM-based serial port.  This assumes that the bootwrapper
  	  has run, and set up the CPM in a particular way.

  endchoice

  config PPC_EARLY_DEBUG_44x_PHYSLOW
  	hex "Low 32 bits of early debug UART physical address"

  	depends on PPC_EARLY_DEBUG_44x

  	default "0x40000200"

  	help
  	  You probably want 0x40000200 for ebony boards and
            0x40000300 for taishan

  
  config PPC_EARLY_DEBUG_44x_PHYSHIGH
  	hex "EPRN of early debug UART physical address"

  	depends on PPC_EARLY_DEBUG_44x

  	default "0x1"

  config PPC_EARLY_DEBUG_40x_PHYSADDR
  	hex "Early debug UART physical address"
  	depends on PPC_EARLY_DEBUG_40x
  	default "0xef600300"

  config PPC_EARLY_DEBUG_CPM_ADDR
  	hex "CPM UART early debug transmit descriptor address"
  	depends on PPC_EARLY_DEBUG_CPM

  	default "0xfa202008" if PPC_EP88XC

  	default "0xf0001ff8" if CPM2

  	default "0xff002008" if CPM1

  	help
  	  This specifies the address of the transmit descriptor
  	  used for early debug output.  Because it is needed before
  	  platform probing is done, all platforms selected must
  	  share the same address.

  endmenu