Kconfig 74.4 KB
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# Select 32 or 64 bit
config 64BIT
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	bool "64-bit kernel" if ARCH = "x86"
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	default ARCH != "i386"
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	---help---
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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
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	def_bool y
	depends on !64BIT
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	select CLKSRC_I8253
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	select HAVE_UID16
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config X86_64
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	def_bool y
	depends on 64BIT
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	select X86_DEV_DMA_OPS
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### Arch settings
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config X86
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	def_bool y
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	select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
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	select HAVE_AOUT if X86_32
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	select HAVE_UNSTABLE_SCHED_CLOCK
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	select ARCH_SUPPORTS_NUMA_BALANCING
	select ARCH_WANTS_PROT_NUMA_PROT_NONE
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	select HAVE_IDE
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	select HAVE_OPROFILE
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	select HAVE_PCSPKR_PLATFORM
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	select HAVE_PERF_EVENTS
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	select HAVE_IOREMAP_PROT
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	select HAVE_KPROBES
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	select HAVE_MEMBLOCK
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	select HAVE_MEMBLOCK_NODE_MAP
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	select ARCH_DISCARD_MEMBLOCK
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	select ARCH_WANT_OPTIONAL_GPIOLIB
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	select ARCH_WANT_FRAME_POINTERS
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	select HAVE_DMA_ATTRS
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	select HAVE_DMA_CONTIGUOUS if !SWIOTLB
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	select HAVE_KRETPROBES
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	select HAVE_OPTPROBES
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	select HAVE_KPROBES_ON_FTRACE
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	select HAVE_FTRACE_MCOUNT_RECORD
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	select HAVE_FENTRY if X86_64
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	select HAVE_C_RECORDMCOUNT
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	select HAVE_DYNAMIC_FTRACE
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	select HAVE_DYNAMIC_FTRACE_WITH_REGS
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	select HAVE_FUNCTION_TRACER
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	select HAVE_FUNCTION_GRAPH_TRACER
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	select HAVE_FUNCTION_GRAPH_FP_TEST
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	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
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	select HAVE_SYSCALL_TRACEPOINTS
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	select SYSCTL_EXCEPTION_TRACE
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	select HAVE_KVM
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	select HAVE_ARCH_KGDB
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	select HAVE_ARCH_TRACEHOOK
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	select HAVE_GENERIC_DMA_COHERENT if X86_32
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	select HAVE_EFFICIENT_UNALIGNED_ACCESS
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	select USER_STACKTRACE_SUPPORT
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	select HAVE_REGS_AND_STACK_ACCESS_API
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	select HAVE_DMA_API_DEBUG
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	select HAVE_KERNEL_GZIP
	select HAVE_KERNEL_BZIP2
	select HAVE_KERNEL_LZMA
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	select HAVE_KERNEL_XZ
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	select HAVE_KERNEL_LZO
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	select HAVE_KERNEL_LZ4
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	select HAVE_HW_BREAKPOINT
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	select HAVE_MIXED_BREAKPOINTS_REGS
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	select PERF_EVENTS
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	select HAVE_PERF_EVENTS_NMI
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	select HAVE_PERF_REGS
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	select HAVE_PERF_USER_STACK_DUMP
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	select HAVE_DEBUG_KMEMLEAK
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	select ANON_INODES
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	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
	select HAVE_CMPXCHG_LOCAL
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	select HAVE_CMPXCHG_DOUBLE
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	select HAVE_ARCH_KMEMCHECK
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	select HAVE_USER_RETURN_NOTIFIER
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	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
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	select HAVE_ARCH_JUMP_LABEL
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	select HAVE_TEXT_POKE_SMP
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	select HAVE_GENERIC_HARDIRQS
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	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
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	select SPARSE_IRQ
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	select GENERIC_FIND_FIRST_BIT
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	select GENERIC_IRQ_PROBE
	select GENERIC_PENDING_IRQ if SMP
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	select GENERIC_IRQ_SHOW
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	select GENERIC_CLOCKEVENTS_MIN_ADJUST
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	select IRQ_FORCED_THREADING
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	select USE_GENERIC_SMP_HELPERS if SMP
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	select HAVE_BPF_JIT if X86_64
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	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
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	select CLKEVT_I8253
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	select ARCH_HAVE_NMI_SAFE_CMPXCHG
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	select GENERIC_IOMAP
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	select DCACHE_WORD_ACCESS
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	select GENERIC_SMP_IDLE_THREAD
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	select ARCH_WANT_IPC_PARSE_VERSION if X86_32
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	select HAVE_ARCH_SECCOMP_FILTER
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	select BUILDTIME_EXTABLE_SORT
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	select GENERIC_CMOS_UPDATE
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	select HAVE_ARCH_SOFT_DIRTY
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	select CLOCKSOURCE_WATCHDOG
	select GENERIC_CLOCKEVENTS
	select ARCH_CLOCKSOURCE_DATA if X86_64
	select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
	select GENERIC_TIME_VSYSCALL if X86_64
	select KTIME_SCALAR if X86_32
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	select GENERIC_STRNCPY_FROM_USER
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	select GENERIC_STRNLEN_USER
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	select HAVE_CONTEXT_TRACKING if X86_64
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	select HAVE_IRQ_TIME_ACCOUNTING
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	select VIRT_TO_BUS
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	select MODULES_USE_ELF_REL if X86_32
	select MODULES_USE_ELF_RELA if X86_64
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	select CLONE_BACKWARDS if X86_32
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	select ARCH_USE_BUILTIN_BSWAP
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	select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
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	select OLD_SIGACTION if X86_32
	select COMPAT_OLD_SIGACTION if IA32_EMULATION
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	select RTC_LIB
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	select HAVE_DEBUG_STACKOVERFLOW
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config INSTRUCTION_DECODER
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	def_bool y
	depends on KPROBES || PERF_EVENTS || UPROBES
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config OUTPUT_FORMAT
	string
	default "elf32-i386" if X86_32
	default "elf64-x86-64" if X86_64

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config ARCH_DEFCONFIG
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	string
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	default "arch/x86/configs/i386_defconfig" if X86_32
	default "arch/x86/configs/x86_64_defconfig" if X86_64
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config LOCKDEP_SUPPORT
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	def_bool y
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config STACKTRACE_SUPPORT
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	def_bool y
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config HAVE_LATENCYTOP_SUPPORT
	def_bool y

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config MMU
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	def_bool y
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config SBUS
	bool

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config NEED_DMA_MAP_STATE
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	def_bool y
	depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG
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config NEED_SG_DMA_LENGTH
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	def_bool y
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config GENERIC_ISA_DMA
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	def_bool y
	depends on ISA_DMA_API
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config GENERIC_BUG
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	def_bool y
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	depends on BUG
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	select GENERIC_BUG_RELATIVE_POINTERS if X86_64

config GENERIC_BUG_RELATIVE_POINTERS
	bool
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config GENERIC_HWEIGHT
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	def_bool y
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config ARCH_MAY_HAVE_PC_FDC
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	def_bool y
	depends on ISA_DMA_API
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config RWSEM_XCHGADD_ALGORITHM
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	def_bool y
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config GENERIC_CALIBRATE_DELAY
	def_bool y

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config ARCH_HAS_CPU_RELAX
	def_bool y

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config ARCH_HAS_CACHE_LINE_SIZE
	def_bool y

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config ARCH_HAS_CPU_AUTOPROBE
	def_bool y

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config HAVE_SETUP_PER_CPU_AREA
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	def_bool y
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config NEED_PER_CPU_EMBED_FIRST_CHUNK
	def_bool y

config NEED_PER_CPU_PAGE_FIRST_CHUNK
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	def_bool y

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config ARCH_HIBERNATION_POSSIBLE
	def_bool y

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config ARCH_SUSPEND_POSSIBLE
	def_bool y

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config ARCH_WANT_HUGE_PMD_SHARE
	def_bool y

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config ARCH_WANT_GENERAL_HUGETLB
	def_bool y

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config ZONE_DMA32
	bool
	default X86_64

config AUDIT_ARCH
	bool
	default X86_64

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config ARCH_SUPPORTS_OPTIMIZED_INLINING
	def_bool y

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config ARCH_SUPPORTS_DEBUG_PAGEALLOC
	def_bool y

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config HAVE_INTEL_TXT
	def_bool y
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	depends on INTEL_IOMMU && ACPI
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config X86_32_SMP
	def_bool y
	depends on X86_32 && SMP

config X86_64_SMP
	def_bool y
	depends on X86_64 && SMP

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config X86_HT
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	def_bool y
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	depends on SMP
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config X86_32_LAZY_GS
	def_bool y
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	depends on X86_32 && !CC_STACKPROTECTOR
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config ARCH_HWEIGHT_CFLAGS
	string
	default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
	default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64

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config ARCH_CPU_PROBE_RELEASE
	def_bool y
	depends on HOTPLUG_CPU

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config ARCH_SUPPORTS_UPROBES
	def_bool y

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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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menu "Processor type and features"

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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.

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config SMP
	bool "Symmetric multi-processing support"
	---help---
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, like most personal computers, say N. If
	  you have a system with more than one CPU, say Y.

	  If you say N here, the kernel will run on single and multiprocessor
	  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,
	  singleprocessor machines. On a singleprocessor machine, the kernel
	  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.

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	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
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	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
	  <http://www.tldp.org/docs.html#howto>.

	  If you don't know what to do here, say N.

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config X86_X2APIC
	bool "Support x2apic"
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	depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
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	---help---
	  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.

	  If you don't know what to do here, say N.

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config X86_MPPARSE
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	bool "Enable MPS table" if ACPI || SFI
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	default y
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	depends on X86_LOCAL_APIC
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	---help---
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	  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

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config X86_BIGSMP
	bool "Support for big SMP systems with more than 8 CPUs"
	depends on X86_32 && SMP
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	---help---
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	  This option is needed for the systems that have more than 8 CPUs
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config GOLDFISH
       def_bool y
       depends on X86_GOLDFISH

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if X86_32
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config X86_EXTENDED_PLATFORM
	bool "Support for extended (non-PC) x86 platforms"
	default y
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	---help---
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	  If you disable this option then the kernel will only support
	  standard PC platforms. (which covers the vast majority of
	  systems out there.)

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	  If you enable this option then you'll be able to select support
	  for the following (non-PC) 32 bit x86 platforms:
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		Goldfish (Android emulator)
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		AMD Elan
		NUMAQ (IBM/Sequent)
		RDC R-321x SoC
		SGI 320/540 (Visual Workstation)
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		STA2X11-based (e.g. Northville)
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		Summit/EXA (IBM x440)
		Unisys ES7000 IA32 series
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		Moorestown MID devices
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	  If you have one of these systems, or if you want to build a
	  generic distribution kernel, say Y here - otherwise say N.
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endif
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if X86_64
config X86_EXTENDED_PLATFORM
	bool "Support for extended (non-PC) x86 platforms"
	default y
	---help---
	  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:
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		Numascale NumaChip
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		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
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# This is an alphabetically sorted list of 64 bit extended platforms
# Please maintain the alphabetic order if and when there are additions
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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
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	depends on PCI_MMCONFIG
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	---help---
	  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.
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config X86_VSMP
	bool "ScaleMP vSMP"
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	select HYPERVISOR_GUEST
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	select PARAVIRT
	depends on X86_64 && PCI
	depends on X86_EXTENDED_PLATFORM
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	depends on SMP
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	---help---
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	  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.
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config X86_UV
	bool "SGI Ultraviolet"
	depends on X86_64
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	depends on X86_EXTENDED_PLATFORM
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	depends on NUMA
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	depends on X86_X2APIC
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	---help---
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	  This option is needed in order to support SGI Ultraviolet systems.
	  If you don't have one of these, you should say N here.

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# Following is an alphabetically sorted list of 32 bit extended platforms
# Please maintain the alphabetic order if and when there are additions
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config X86_GOLDFISH
       bool "Goldfish (Virtual Platform)"
       depends on X86_32
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       depends on X86_EXTENDED_PLATFORM
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       ---help---
	 Enable support for the Goldfish virtual platform used primarily
	 for Android development. Unless you are building for the Android
	 Goldfish emulator say N here.

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config X86_INTEL_CE
	bool "CE4100 TV platform"
	depends on PCI
	depends on PCI_GODIRECT
	depends on X86_32
	depends on X86_EXTENDED_PLATFORM
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	select X86_REBOOTFIXUPS
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	select OF
	select OF_EARLY_FLATTREE
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	select IRQ_DOMAIN
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	---help---
	  Select for the Intel CE media processor (CE4100) SOC.
	  This option compiles in support for the CE4100 SOC for settop
	  boxes and media devices.

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config X86_WANT_INTEL_MID
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	bool "Intel MID platform support"
	depends on X86_32
	depends on X86_EXTENDED_PLATFORM
	---help---
	  Select to build a kernel capable of supporting Intel MID platform
	  systems which do not have the PCI legacy interfaces (Moorestown,
	  Medfield). If you are building for a PC class system say N here.

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if X86_WANT_INTEL_MID
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config X86_INTEL_MID
	bool

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config X86_MDFLD
       bool "Medfield MID platform"
	depends on PCI
	depends on PCI_GOANY
	depends on X86_IO_APIC
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	select X86_INTEL_MID
	select SFI
	select DW_APB_TIMER
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	select APB_TIMER
	select I2C
	select SPI
	select INTEL_SCU_IPC
	select X86_PLATFORM_DEVICES
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	select MFD_INTEL_MSIC
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	---help---
	  Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin
	  Internet Device(MID) platform. 
	  Unlike standard x86 PCs, Medfield does not have many legacy devices
	  nor standard legacy replacement devices/features. e.g. Medfield does
	  not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.

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endif

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config X86_INTEL_LPSS
	bool "Intel Low Power Subsystem Support"
	depends on ACPI
	select COMMON_CLK
	---help---
	  Select to build support for Intel Low Power Subsystem such as
	  found on Intel Lynxpoint PCH. Selecting this option enables
	  things like clock tree (common clock framework) which are needed
	  by the LPSS peripheral drivers.

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config X86_RDC321X
	bool "RDC R-321x SoC"
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	depends on X86_32
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	depends on X86_EXTENDED_PLATFORM
	select M486
	select X86_REBOOTFIXUPS
	---help---
	  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.

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config X86_32_NON_STANDARD
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	bool "Support non-standard 32-bit SMP architectures"
	depends on X86_32 && SMP
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	depends on X86_EXTENDED_PLATFORM
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	---help---
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	  This option compiles in the NUMAQ, Summit, bigsmp, ES7000,
	  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.
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# Alphabetically sorted list of Non standard 32 bit platforms
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config X86_NUMAQ
	bool "NUMAQ (IBM/Sequent)"
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	depends on X86_32_NON_STANDARD
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	depends on PCI
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	select NUMA
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	select X86_MPPARSE
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	---help---
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	  This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
	  NUMA multiquad box. This changes the way that processors are
	  bootstrapped, and uses Clustered Logical APIC addressing mode instead
	  of Flat Logical.  You will need a new lynxer.elf file to flash your
	  firmware with - send email to <Martin.Bligh@us.ibm.com>.
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config X86_SUPPORTS_MEMORY_FAILURE
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	def_bool y
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	# 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:
	depends on !X86_NUMAQ
	# On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
	depends on X86_64 || !SPARSEMEM
	select ARCH_SUPPORTS_MEMORY_FAILURE

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config X86_VISWS
	bool "SGI 320/540 (Visual Workstation)"
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	depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
	depends on X86_32_NON_STANDARD
	---help---
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	  The SGI Visual Workstation series is an IA32-based workstation
	  based on SGI systems chips with some legacy PC hardware attached.

	  Say Y here to create a kernel to run on the SGI 320 or 540.

	  A kernel compiled for the Visual Workstation will run on general
	  PCs as well. See <file:Documentation/sgi-visws.txt> for details.

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config STA2X11
	bool "STA2X11 Companion Chip Support"
	depends on X86_32_NON_STANDARD && PCI
	select X86_DEV_DMA_OPS
	select X86_DMA_REMAP
	select SWIOTLB
	select MFD_STA2X11
	select ARCH_REQUIRE_GPIOLIB
	default n
	---help---
	  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.

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config X86_SUMMIT
	bool "Summit/EXA (IBM x440)"
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	depends on X86_32_NON_STANDARD
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	---help---
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	  This option is needed for IBM systems that use the Summit/EXA chipset.
	  In particular, it is needed for the x440.
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config X86_ES7000
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	bool "Unisys ES7000 IA32 series"
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	depends on X86_32_NON_STANDARD && X86_BIGSMP
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	---help---
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	  Support for Unisys ES7000 systems.  Say 'Y' here if this kernel is
	  supposed to run on an IA32-based Unisys ES7000 system.

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config X86_32_IRIS
	tristate "Eurobraille/Iris poweroff module"
	depends on X86_32
	---help---
	  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.

593
config SCHED_OMIT_FRAME_POINTER
594 595
	def_bool y
	prompt "Single-depth WCHAN output"
596
	depends on X86
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	---help---
598 599 600 601 602 603 604
	  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".

605 606
menuconfig HYPERVISOR_GUEST
	bool "Linux guest support"
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	---help---
608 609 610
	  Say Y here to enable options for running Linux under various hyper-
	  visors. This option enables basic hypervisor detection and platform
	  setup.
611

612 613
	  If you say N, all options in this submenu will be skipped and
	  disabled, and Linux guest support won't be built in.
614

615
if HYPERVISOR_GUEST
616

617 618
config PARAVIRT
	bool "Enable paravirtualization code"
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	---help---
620 621 622 623 624
	  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.

625 626 627 628 629 630 631
config PARAVIRT_DEBUG
	bool "paravirt-ops debugging"
	depends on PARAVIRT && DEBUG_KERNEL
	---help---
	  Enable to debug paravirt_ops internals.  Specifically, BUG if
	  a paravirt_op is missing when it is called.

632 633
config PARAVIRT_SPINLOCKS
	bool "Paravirtualization layer for spinlocks"
634
	depends on PARAVIRT && SMP
635 636 637 638 639 640 641 642 643 644
	---help---
	  Paravirtualized spinlocks allow a pvops backend to replace the
	  spinlock implementation with something virtualization-friendly
	  (for example, block the virtual CPU rather than spinning).

	  Unfortunately the downside is an up to 5% performance hit on
	  native kernels, with various workloads.

	  If you are unsure how to answer this question, answer N.

645
source "arch/x86/xen/Kconfig"
646

647 648 649 650 651
config KVM_GUEST
	bool "KVM Guest support (including kvmclock)"
	depends on PARAVIRT
	select PARAVIRT_CLOCK
	default y
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	---help---
653 654 655 656 657
	  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
658

659 660 661 662 663 664
source "arch/x86/lguest/Kconfig"

config PARAVIRT_TIME_ACCOUNTING
	bool "Paravirtual steal time accounting"
	depends on PARAVIRT
	default n
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	---help---
666 667 668 669 670 671 672 673 674
	  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
675

676
endif #HYPERVISOR_GUEST
677

678
config NO_BOOTMEM
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	def_bool y
680

681 682
config MEMTEST
	bool "Memtest"
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	---help---
Y
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	  This option adds a kernel parameter 'memtest', which allows memtest
685
	  to be set.
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	        memtest=0, mean disabled; -- default
	        memtest=1, mean do 1 test pattern;
	        ...
	        memtest=4, mean do 4 test patterns.
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	  If you are unsure how to answer this question, answer N.
691 692

config X86_SUMMIT_NUMA
693
	def_bool y
694
	depends on X86_32 && NUMA && X86_32_NON_STANDARD
695 696

config X86_CYCLONE_TIMER
697
	def_bool y
698
	depends on X86_SUMMIT
699 700 701 702

source "arch/x86/Kconfig.cpu"

config HPET_TIMER
703
	def_bool X86_64
704
	prompt "HPET Timer Support" if X86_32
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	---help---
	  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,
	  as it is off-chip.  You can find the HPET spec at
	  <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
714

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	  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.
718

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	  Choose N to continue using the legacy 8254 timer.
720 721

config HPET_EMULATE_RTC
722
	def_bool y
723
	depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
724

725
config APB_TIMER
726 727
       def_bool y if X86_INTEL_MID
       prompt "Intel MID APB Timer Support" if X86_INTEL_MID
728
       select DW_APB_TIMER
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       depends on X86_INTEL_MID && SFI
730 731 732 733 734 735 736
       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.

737
# Mark as expert because too many people got it wrong.
738
# The code disables itself when not needed.
739 740
config DMI
	default y
741
	bool "Enable DMI scanning" if EXPERT
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	---help---
743 744 745 746 747
	  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.

748
config GART_IOMMU
749
	bool "GART IOMMU support" if EXPERT
750 751
	default y
	select SWIOTLB
752
	depends on X86_64 && PCI && AMD_NB
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	---help---
754 755 756 757 758 759 760 761 762 763 764 765 766
	  Support for full DMA access of devices with 32bit memory access only
	  on systems with more than 3GB. This is usually needed for USB,
	  sound, many IDE/SATA chipsets and some other devices.
	  Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
	  based hardware IOMMU and a software bounce buffer based IOMMU used
	  on Intel systems and as fallback.
	  The code is only active when needed (enough memory and limited
	  device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
	  too.

config CALGARY_IOMMU
	bool "IBM Calgary IOMMU support"
	select SWIOTLB
767
	depends on X86_64 && PCI
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	---help---
769 770 771 772 773 774 775 776 777 778 779 780 781 782
	  Support for hardware IOMMUs in IBM's xSeries x366 and x460
	  systems. Needed to run systems with more than 3GB of memory
	  properly with 32-bit PCI devices that do not support DAC
	  (Double Address Cycle). Calgary also supports bus level
	  isolation, where all DMAs pass through the IOMMU.  This
	  prevents them from going anywhere except their intended
	  destination. This catches hard-to-find kernel bugs and
	  mis-behaving drivers and devices that do not use the DMA-API
	  properly to set up their DMA buffers.  The IOMMU can be
	  turned off at boot time with the iommu=off parameter.
	  Normally the kernel will make the right choice by itself.
	  If unsure, say Y.

config CALGARY_IOMMU_ENABLED_BY_DEFAULT
783 784
	def_bool y
	prompt "Should Calgary be enabled by default?"
785
	depends on CALGARY_IOMMU
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	---help---
787 788 789 790 791 792 793 794
	  Should Calgary be enabled by default? if you choose 'y', Calgary
	  will be used (if it exists). If you choose 'n', Calgary will not be
	  used even if it exists. If you choose 'n' and would like to use
	  Calgary anyway, pass 'iommu=calgary' on the kernel command line.
	  If unsure, say Y.

# need this always selected by IOMMU for the VIA workaround
config SWIOTLB
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	def_bool y if X86_64
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	---help---
797
	  Support for software bounce buffers used on x86-64 systems
798 799 800 801
	  which don't have a hardware IOMMU. Using this PCI devices
	  which can only access 32-bits of memory can be used on systems
	  with more than 3 GB of memory.
	  If unsure, say Y.
802

803
config IOMMU_HELPER
804 805
	def_bool y
	depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
806

807
config MAXSMP
808
	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
809
	depends on X86_64 && SMP && DEBUG_KERNEL
M
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	select CPUMASK_OFFSTACK
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811
	---help---
812
	  Enable maximum number of CPUS and NUMA Nodes for this architecture.
813
	  If unsure, say N.
814 815

config NR_CPUS
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	int "Maximum number of CPUs" if SMP && !MAXSMP
817
	range 2 8 if SMP && X86_32 && !X86_BIGSMP
M
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	range 2 512 if SMP && !MAXSMP
M
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	default "1" if !SMP
820
	default "4096" if MAXSMP
M
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	default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
	default "8" if SMP
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	---help---
824
	  This allows you to specify the maximum number of CPUs which this
825
	  kernel will support.  The maximum supported value is 512 and the
826 827 828 829 830 831 832
	  minimum value which makes sense is 2.

	  This is purely to save memory - each supported CPU adds
	  approximately eight kilobytes to the kernel image.

config SCHED_SMT
	bool "SMT (Hyperthreading) scheduler support"
833
	depends on X86_HT
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	---help---
835 836 837 838 839 840
	  SMT scheduler support improves the CPU scheduler's decision making
	  when dealing with Intel Pentium 4 chips with HyperThreading at a
	  cost of slightly increased overhead in some places. If unsure say
	  N here.

config SCHED_MC
841 842
	def_bool y
	prompt "Multi-core scheduler support"
843
	depends on X86_HT
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	---help---
845 846 847 848 849 850 851 852
	  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.

source "kernel/Kconfig.preempt"

config X86_UP_APIC
	bool "Local APIC support on uniprocessors"
853
	depends on X86_32 && !SMP && !X86_32_NON_STANDARD
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	---help---
855 856 857 858 859 860 861 862 863 864 865 866
	  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
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	---help---
868 869 870 871 872 873 874 875 876
	  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
877
	def_bool y
878
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
879 880

config X86_IO_APIC
881
	def_bool y
882
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
883 884

config X86_VISWS_APIC
885
	def_bool y
886 887
	depends on X86_32 && X86_VISWS

888 889 890
config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
	bool "Reroute for broken boot IRQs"
	depends on X86_IO_APIC
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	---help---
892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
	  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.

911
config X86_MCE
912
	bool "Machine Check / overheating reporting"
913
	default y
914
	---help---
915 916
	  Machine Check support allows the processor to notify the
	  kernel if it detects a problem (e.g. overheating, data corruption).
917
	  The action the kernel takes depends on the severity of the problem,
918
	  ranging from warning messages to halting the machine.
919

920
config X86_MCE_INTEL
921 922
	def_bool y
	prompt "Intel MCE features"
923
	depends on X86_MCE && X86_LOCAL_APIC
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	---help---
925 926 927 928
	   Additional support for intel specific MCE features such as
	   the thermal monitor.

config X86_MCE_AMD
929 930
	def_bool y
	prompt "AMD MCE features"
931
	depends on X86_MCE && X86_LOCAL_APIC
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932
	---help---
933 934 935
	   Additional support for AMD specific MCE features such as
	   the DRAM Error Threshold.

936
config X86_ANCIENT_MCE
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937
	bool "Support for old Pentium 5 / WinChip machine checks"
938
	depends on X86_32 && X86_MCE
939 940 941 942
	---help---
	  Include support for machine check handling on old Pentium 5 or WinChip
	  systems. These typically need to be enabled explicitely on the command
	  line.
943

944 945
config X86_MCE_THRESHOLD
	depends on X86_MCE_AMD || X86_MCE_INTEL
J
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946
	def_bool y
947

948
config X86_MCE_INJECT
949
	depends on X86_MCE
950 951 952 953 954 955
	tristate "Machine check injector support"
	---help---
	  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.

956 957
config X86_THERMAL_VECTOR
	def_bool y
958
	depends on X86_MCE_INTEL
959

960
config VM86
961
	bool "Enable VM86 support" if EXPERT
962 963
	default y
	depends on X86_32
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964 965
	---help---
	  This option is required by programs like DOSEMU to run 16-bit legacy
966
	  code on X86 processors. It also may be needed by software like
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967 968
	  XFree86 to initialize some video cards via BIOS. Disabling this
	  option saves about 6k.
969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987

config TOSHIBA
	tristate "Toshiba Laptop support"
	depends on X86_32
	---help---
	  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
	tristate "Dell laptop support"
988
	select HWMON
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
	---help---
	  This adds a driver to safely access the System Management Mode
	  of the CPU on the Dell Inspiron 8000. The System Management Mode
	  is used to read cpu temperature and cooling fan status and to
	  control the fans on the I8K portables.

	  This driver has been tested only on the Inspiron 8000 but it may
	  also work with other Dell laptops. You can force loading on other
	  models by passing the parameter `force=1' to the module. Use at
	  your own risk.

	  For information on utilities to make use of this driver see the
	  I8K Linux utilities web site at:
	  <http://people.debian.org/~dz/i8k/>

	  Say Y if you intend to run this kernel on a Dell Inspiron 8000.
	  Say N otherwise.

config X86_REBOOTFIXUPS
1008 1009
	bool "Enable X86 board specific fixups for reboot"
	depends on X86_32
1010 1011 1012 1013 1014 1015 1016 1017
	---help---
	  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
1018
	  CS5530A and CS5536 chipsets and the RDC R-321x SoC.
1019 1020 1021 1022 1023 1024

	  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
1025
	tristate "CPU microcode loading support"
1026 1027
	select FW_LOADER
	---help---
1028

1029
	  If you say Y here, you will be able to update the microcode on
1030
	  certain Intel and AMD processors. The Intel support is for the
1031 1032 1033 1034
	  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.
1035

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1036 1037
	  This option selects the general module only, you need to select
	  at least one vendor specific module as well.
1038

1039 1040
	  To compile this driver as a module, choose M here: the module
	  will be called microcode.
1041

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1042
config MICROCODE_INTEL
1043
	bool "Intel microcode loading support"
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1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	depends on MICROCODE
	default MICROCODE
	select FW_LOADER
	---help---
	  This options enables microcode patch loading support for Intel
	  processors.

	  For latest news and information on obtaining all the required
	  Intel ingredients for this driver, check:
	  <http://www.urbanmyth.org/microcode/>.
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1055
config MICROCODE_AMD
1056
	bool "AMD microcode loading support"
I
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1057 1058 1059 1060 1061
	depends on MICROCODE
	select FW_LOADER
	---help---
	  If you select this option, microcode patch loading support for AMD
	  processors will be enabled.
1062

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1063
config MICROCODE_OLD_INTERFACE
1064
	def_bool y
1065 1066
	depends on MICROCODE

1067 1068 1069 1070 1071
config MICROCODE_INTEL_LIB
	def_bool y
	depends on MICROCODE_INTEL

config MICROCODE_INTEL_EARLY
1072 1073 1074 1075 1076 1077
	def_bool n

config MICROCODE_AMD_EARLY
	def_bool n

config MICROCODE_EARLY
1078
	bool "Early load microcode"
1079
	depends on MICROCODE=y && BLK_DEV_INITRD
1080 1081
	select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
	select MICROCODE_AMD_EARLY if MICROCODE_AMD
1082 1083 1084 1085 1086 1087 1088
	default y
	help
	  This option provides functionality to read additional microcode data
	  at the beginning of initrd image. The data tells kernel to load
	  microcode to CPU's as early as possible. No functional change if no
	  microcode data is glued to the initrd, therefore it's safe to say Y.

1089 1090
config X86_MSR
	tristate "/dev/cpu/*/msr - Model-specific register support"
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	---help---
1092 1093 1094 1095 1096 1097 1098 1099
	  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"
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	---help---
1101 1102 1103 1104 1105 1106 1107 1108
	  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"
	default HIGHMEM64G if X86_NUMAQ
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	default HIGHMEM4G
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	depends on X86_32

config NOHIGHMEM
	bool "off"
	depends on !X86_NUMAQ
	---help---
	  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"
	depends on !X86_NUMAQ
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	---help---
1153 1154 1155 1156 1157
	  Select this if you have a 32-bit processor and between 1 and 4
	  gigabytes of physical RAM.

config HIGHMEM64G
	bool "64GB"
1158
	depends on !M486
1159
	select X86_PAE
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	---help---
1161 1162 1163 1164 1165 1166
	  Select this if you have a 32-bit processor and more than 4
	  gigabytes of physical RAM.

endchoice

choice
1167
	prompt "Memory split" if EXPERT
1168 1169
	default VMSPLIT_3G
	depends on X86_32
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	---help---
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
	  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
1210
	def_bool y
1211 1212 1213
	depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)

config X86_PAE
1214
	bool "PAE (Physical Address Extension) Support"
1215
	depends on X86_32 && !HIGHMEM4G
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	---help---
1217 1218 1219 1220 1221
	  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.

1222
config ARCH_PHYS_ADDR_T_64BIT
1223 1224
	def_bool y
	depends on X86_64 || X86_PAE
1225

1226
config ARCH_DMA_ADDR_T_64BIT
1227 1228
	def_bool y
	depends on X86_64 || HIGHMEM64G
1229

1230
config DIRECT_GBPAGES
1231
	bool "Enable 1GB pages for kernel pagetables" if EXPERT
1232 1233
	default y
	depends on X86_64
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	---help---
1235 1236 1237 1238
	  Allow the kernel linear mapping to use 1GB pages on CPUs that
	  support it. This can improve the kernel's performance a tiny bit by
	  reducing TLB pressure. If in doubt, say "Y".

1239 1240
# Common NUMA Features
config NUMA
1241
	bool "Numa Memory Allocation and Scheduler Support"
1242
	depends on SMP
1243
	depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
1244
	default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
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	---help---
1246
	  Enable NUMA (Non Uniform Memory Access) support.
1247

1248 1249 1250 1251
	  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.

1252
	  For 64-bit this is recommended if the system is Intel Core i7
1253 1254 1255 1256 1257 1258 1259
	  (or later), AMD Opteron, or EM64T NUMA.

	  For 32-bit this is only needed on (rare) 32-bit-only platforms
	  that support NUMA topologies, such as NUMAQ / Summit, or if you
	  boot a 32-bit kernel on a 64-bit NUMA platform.

	  Otherwise, you should say N.
1260 1261 1262 1263

comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
	depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)

1264
config AMD_NUMA
1265 1266
	def_bool y
	prompt "Old style AMD Opteron NUMA detection"
1267
	depends on X86_64 && NUMA && PCI
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	---help---
1269 1270 1271 1272 1273
	  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.
1274 1275

config X86_64_ACPI_NUMA
1276 1277
	def_bool y
	prompt "ACPI NUMA detection"
1278 1279
	depends on X86_64 && NUMA && ACPI && PCI
	select ACPI_NUMA
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	---help---
1281 1282
	  Enable ACPI SRAT based node topology detection.

1283 1284 1285 1286 1287 1288 1289 1290 1291
# Some NUMA nodes have memory ranges that span
# other nodes.  Even though a pfn is valid and
# between a node's start and end pfns, it may not
# reside on that node.  See memmap_init_zone()
# for details.
config NODES_SPAN_OTHER_NODES
	def_bool y
	depends on X86_64_ACPI_NUMA

1292 1293
config NUMA_EMU
	bool "NUMA emulation"
1294
	depends on NUMA
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	---help---
1296 1297 1298 1299 1300
	  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
1301
	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
1302 1303
	range 1 10
	default "10" if MAXSMP
1304 1305 1306 1307
	default "6" if X86_64
	default "4" if X86_NUMAQ
	default "3"
	depends on NEED_MULTIPLE_NODES
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	---help---
1309
	  Specify the maximum number of NUMA Nodes available on the target
1310
	  system.  Increases memory reserved to accommodate various tables.
1311 1312

config ARCH_HAVE_MEMORY_PRESENT
1313
	def_bool y
1314 1315 1316
	depends on X86_32 && DISCONTIGMEM

config NEED_NODE_MEMMAP_SIZE
1317
	def_bool y
1318 1319 1320 1321
	depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)

config ARCH_FLATMEM_ENABLE
	def_bool y
1322
	depends on X86_32 && !NUMA
1323 1324 1325

config ARCH_DISCONTIGMEM_ENABLE
	def_bool y
1326
	depends on NUMA && X86_32
1327 1328 1329

config ARCH_DISCONTIGMEM_DEFAULT
	def_bool y
1330 1331
	depends on NUMA && X86_32

1332 1333
config ARCH_SPARSEMEM_ENABLE
	def_bool y
1334
	depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
1335 1336 1337
	select SPARSEMEM_STATIC if X86_32
	select SPARSEMEM_VMEMMAP_ENABLE if X86_64

1338 1339 1340 1341
config ARCH_SPARSEMEM_DEFAULT
	def_bool y
	depends on X86_64

1342 1343
config ARCH_SELECT_MEMORY_MODEL
	def_bool y
1344
	depends on ARCH_SPARSEMEM_ENABLE
1345 1346

config ARCH_MEMORY_PROBE
1347 1348
	def_bool y
	depends on X86_64 && MEMORY_HOTPLUG
1349

1350 1351 1352 1353
config ARCH_PROC_KCORE_TEXT
	def_bool y
	depends on X86_64 && PROC_KCORE

1354 1355 1356 1357 1358
config ILLEGAL_POINTER_VALUE
       hex
       default 0 if X86_32
       default 0xdead000000000000 if X86_64

1359 1360 1361 1362
source "mm/Kconfig"

config HIGHPTE
	bool "Allocate 3rd-level pagetables from highmem"
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	depends on HIGHMEM
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	---help---
1365 1366 1367 1368 1369
	  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.

1370
config X86_CHECK_BIOS_CORRUPTION
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1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
	bool "Check for low memory corruption"
	---help---
	  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
	  Documentation/kernel-parameters.txt to adjust this.

	  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.
1391

1392
config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
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	bool "Set the default setting of memory_corruption_check"
1394 1395
	depends on X86_CHECK_BIOS_CORRUPTION
	default y
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	---help---
	  Set whether the default state of memory_corruption_check is
	  on or off.
1399

1400
config X86_RESERVE_LOW
1401 1402 1403
	int "Amount of low memory, in kilobytes, to reserve for the BIOS"
	default 64
	range 4 640
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	---help---
1405 1406 1407 1408 1409 1410 1411 1412 1413
	  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.
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1415 1416 1417 1418 1419
	  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.
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1421 1422 1423 1424 1425
	  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.
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1427
	  Leave this to the default value of 64 if you are unsure.
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1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
config MATH_EMULATION
	bool
	prompt "Math emulation" if X86_32
	---help---
	  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
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	def_bool y
1457
	prompt "MTRR (Memory Type Range Register) support" if EXPERT
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
	---help---
	  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.

1488
	  See <file:Documentation/x86/mtrr.txt> for more information.
1489

1490
config MTRR_SANITIZER
1491
	def_bool y
1492 1493
	prompt "MTRR cleanup support"
	depends on MTRR
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	---help---
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1495 1496
	  Convert MTRR layout from continuous to discrete, so X drivers can
	  add writeback entries.
1497

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	  Can be disabled with disable_mtrr_cleanup on the kernel command line.
1499
	  The largest mtrr entry size for a continuous block can be set with
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	  mtrr_chunk_size.
1501

1502
	  If unsure, say Y.
1503 1504

config MTRR_SANITIZER_ENABLE_DEFAULT
1505 1506 1507
	int "MTRR cleanup enable value (0-1)"
	range 0 1
	default "0"
1508
	depends on MTRR_SANITIZER
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	---help---
1510
	  Enable mtrr cleanup default value
1511

1512 1513 1514 1515 1516
config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
	int "MTRR cleanup spare reg num (0-7)"
	range 0 7
	default "1"
	depends on MTRR_SANITIZER
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	---help---
1518
	  mtrr cleanup spare entries default, it can be changed via
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	  mtrr_spare_reg_nr=N on the kernel command line.
1520

1521
config X86_PAT
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	def_bool y
1523
	prompt "x86 PAT support" if EXPERT
1524
	depends on MTRR
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1525
	---help---
1526
	  Use PAT attributes to setup page level cache control.
1527

1528 1529 1530 1531
	  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,
1532
	  spontaneous reboots) or a non-working video driver.
1533 1534 1535

	  If unsure, say Y.

1536 1537 1538 1539
config ARCH_USES_PG_UNCACHED
	def_bool y
	depends on X86_PAT

1540 1541 1542 1543 1544 1545 1546 1547 1548
config ARCH_RANDOM
	def_bool y
	prompt "x86 architectural random number generator" if EXPERT
	---help---
	  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.

1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
config X86_SMAP
	def_bool y
	prompt "Supervisor Mode Access Prevention" if EXPERT
	---help---
	  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.

1560
config EFI
1561
	bool "EFI runtime service support"
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1562
	depends on ACPI
1563
	select UCS2_STRING
1564
	---help---
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1565 1566
	  This enables the kernel to use EFI runtime services that are
	  available (such as the EFI variable services).
1567

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1568 1569 1570 1571 1572 1573
	  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.
1574

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config EFI_STUB
       bool "EFI stub support"
       depends on EFI
       ---help---
          This kernel feature allows a bzImage to be loaded directly
	  by EFI firmware without the use of a bootloader.

1582 1583
	  See Documentation/x86/efi-stub.txt for more information.

1584
config SECCOMP
1585 1586
	def_bool y
	prompt "Enable seccomp to safely compute untrusted bytecode"
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	---help---
1588 1589 1590 1591 1592 1593
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
1594
	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1595 1596 1597 1598 1599 1600
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.

	  If unsure, say Y. Only embedded should say N here.

config CC_STACKPROTECTOR
1601
	bool "Enable -fstack-protector buffer overflow detection"
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	---help---
	  This option turns on the -fstack-protector GCC feature. This
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	  feature puts, at the beginning of functions, a canary value on
	  the stack just before the return address, and validates
1606 1607 1608 1609 1610 1611 1612
	  the value just before actually returning.  Stack based buffer
	  overflows (that need to overwrite this return address) now also
	  overwrite the canary, which gets detected and the attack is then
	  neutralized via a kernel panic.

	  This feature requires gcc version 4.2 or above, or a distribution
	  gcc with the feature backported. Older versions are automatically
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	  detected and for those versions, this configuration option is
	  ignored. (and a warning is printed during bootup)
1615 1616 1617 1618 1619

source kernel/Kconfig.hz

config KEXEC
	bool "kexec system call"
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	---help---
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
	  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
	  initially work for you.  It may help to enable device hotplugging
	  support.  As of this writing the exact hardware interface is
	  strongly in flux, so no good recommendation can be made.

config CRASH_DUMP
1635
	bool "kernel crash dumps"
1636
	depends on X86_64 || (X86_32 && HIGHMEM)
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	---help---
1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
	  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).
	  For more details see Documentation/kdump/kdump.txt

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config KEXEC_JUMP
1649
	bool "kexec jump"
1650
	depends on KEXEC && HIBERNATION
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1651
	---help---
1652 1653
	  Jump between original kernel and kexeced kernel and invoke
	  code in physical address mode via KEXEC
H
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1655
config PHYSICAL_START
1656
	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
1657
	default "0x1000000"
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	---help---
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
	  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.

1676 1677 1678 1679 1680 1681 1682 1683 1684
	  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
	  kernel. Please take a look at Documentation/kdump/kdump.txt
	  for more details about crash dumps.
1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696

	  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
1697 1698
	bool "Build a relocatable kernel"
	default y
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	---help---
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712
	  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
	  (CONFIG_PHYSICAL_START) is ignored.

1713 1714 1715 1716 1717
# Relocation on x86-32 needs some additional build support
config X86_NEED_RELOCS
	def_bool y
	depends on X86_32 && RELOCATABLE

1718
config PHYSICAL_ALIGN
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	hex "Alignment value to which kernel should be aligned" if X86_32
1720 1721
	default "0x1000000"
	range 0x2000 0x1000000
I
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1722
	---help---
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
	  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.

	  Don't change this unless you know what you are doing.

config HOTPLUG_CPU
1742
	bool "Support for hot-pluggable CPUs"
1743
	depends on SMP
1744
	---help---
1745 1746 1747 1748 1749
	  Say Y here to allow turning CPUs off and on. CPUs can be
	  controlled through /sys/devices/system/cpu.
	  ( Note: power management support will enable this option
	    automatically on SMP systems. )
	  Say N if you want to disable CPU hotplug.
1750

1751 1752 1753
config BOOTPARAM_HOTPLUG_CPU0
	bool "Set default setting of cpu0_hotpluggable"
	default n
1754
	depends on HOTPLUG_CPU
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
	---help---
	  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.

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config DEBUG_HOTPLUG_CPU0
	def_bool n
	prompt "Debug CPU0 hotplug"
1783
	depends on HOTPLUG_CPU
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	---help---
	  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.

1795
config COMPAT_VDSO
1796 1797
	def_bool y
	prompt "Compat VDSO support"
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	depends on X86_32 || IA32_EMULATION
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	---help---
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	  Map the 32-bit VDSO to the predictable old-style address too.
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1802 1803 1804 1805 1806 1807
	  Say N here if you are running a sufficiently recent glibc
	  version (2.3.3 or later), to remove the high-mapped
	  VDSO mapping and to exclusively use the randomized VDSO.

	  If unsure, say Y.

1808 1809
config CMDLINE_BOOL
	bool "Built-in kernel command line"
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	---help---
1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827
	  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
	  the boot arguments in CONFIG_CMDLINE.

	  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 ""
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	---help---
1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
	  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"
	depends on CMDLINE_BOOL
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	---help---
1845 1846 1847 1848 1849 1850
	  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.

1851 1852 1853 1854 1855 1856
endmenu

config ARCH_ENABLE_MEMORY_HOTPLUG
	def_bool y
	depends on X86_64 || (X86_32 && HIGHMEM)

1857 1858 1859 1860
config ARCH_ENABLE_MEMORY_HOTREMOVE
	def_bool y
	depends on MEMORY_HOTPLUG

1861
config USE_PERCPU_NUMA_NODE_ID
1862
	def_bool y
1863 1864
	depends on NUMA

1865
menu "Power management and ACPI options"
1866 1867

config ARCH_HIBERNATION_HEADER
1868
	def_bool y
1869 1870 1871 1872 1873 1874
	depends on X86_64 && HIBERNATION

source "kernel/power/Kconfig"

source "drivers/acpi/Kconfig"

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1875 1876
source "drivers/sfi/Kconfig"

1877
config X86_APM_BOOT
J
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1878
	def_bool y
1879
	depends on APM
1880

1881 1882
menuconfig APM
	tristate "APM (Advanced Power Management) BIOS support"
1883
	depends on X86_32 && PM_SLEEP
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898
	---help---
	  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
1899 1900
	  and more information, read <file:Documentation/power/apm-acpi.txt>
	  and the Battery Powered Linux mini-HOWTO, available from
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
	  <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"
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	---help---
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966
	  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"
	---help---
	  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
1967
	depends on CPU_IDLE
1968
	bool "Make CPU Idle calls when idle"
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	---help---
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
	  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"
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	---help---
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992
	  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"
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	---help---
1994 1995 1996 1997 1998 1999 2000 2001 2002
	  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.

endif # APM

2003
source "drivers/cpufreq/Kconfig"
2004 2005 2006

source "drivers/cpuidle/Kconfig"

A
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source "drivers/idle/Kconfig"

2009 2010 2011 2012 2013 2014
endmenu


menu "Bus options (PCI etc.)"

config PCI
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2015
	bool "PCI support"
A
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2016
	default y
2017
	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
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2018
	---help---
2019 2020 2021 2022 2023 2024 2025
	  Find out whether you have a PCI motherboard. PCI 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 ISA, EISA, MicroChannel (MCA) or
	  VESA. If you have PCI, say Y, otherwise N.

choice
	prompt "PCI access mode"
2026
	depends on X86_32 && PCI
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
	default PCI_GOANY
	---help---
	  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"

2052
config PCI_GOOLPC
2053
	bool "OLPC XO-1"
2054 2055
	depends on OLPC

2056 2057 2058
config PCI_GOANY
	bool "Any"

2059 2060 2061
endchoice

config PCI_BIOS
2062
	def_bool y
2063
	depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
2064 2065 2066

# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
config PCI_DIRECT
2067
	def_bool y
2068
	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
2069 2070

config PCI_MMCONFIG
2071
	def_bool y
F
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2072
	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
2073

2074
config PCI_OLPC
2075 2076
	def_bool y
	depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
2077

2078 2079 2080 2081 2082
config PCI_XEN
	def_bool y
	depends on PCI && XEN
	select SWIOTLB_XEN

2083
config PCI_DOMAINS
2084
	def_bool y
2085 2086 2087 2088 2089 2090
	depends on PCI

config PCI_MMCONFIG
	bool "Support mmconfig PCI config space access"
	depends on X86_64 && PCI && ACPI

2091
config PCI_CNB20LE_QUIRK
2092
	bool "Read CNB20LE Host Bridge Windows" if EXPERT
2093
	depends on PCI
2094 2095 2096 2097 2098
	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.

2099 2100 2101 2102 2103
	  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.

2104 2105 2106 2107
source "drivers/pci/pcie/Kconfig"

source "drivers/pci/Kconfig"

2108
# x86_64 have no ISA slots, but can have ISA-style DMA.
2109
config ISA_DMA_API
2110 2111 2112 2113 2114
	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.
2115 2116 2117 2118 2119

if X86_32

config ISA
	bool "ISA support"
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2120
	---help---
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
	  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.

config EISA
	bool "EISA support"
	depends on ISA
	---help---
	  The Extended Industry Standard Architecture (EISA) bus was
	  developed as an open alternative to the IBM MicroChannel bus.

	  The EISA bus provided some of the features of the IBM MicroChannel
	  bus while maintaining backward compatibility with cards made for
	  the older ISA bus.  The EISA bus saw limited use between 1988 and
	  1995 when it was made obsolete by the PCI bus.

	  Say Y here if you are building a kernel for an EISA-based machine.

	  Otherwise, say N.

source "drivers/eisa/Kconfig"

config SCx200
	tristate "NatSemi SCx200 support"
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	---help---
2148 2149 2150 2151 2152 2153 2154 2155 2156
	  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"
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2157
	depends on SCx200
2158
	default y
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2159
	---help---
2160 2161 2162 2163 2164 2165
	  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.

2166 2167
config OLPC
	bool "One Laptop Per Child support"
2168
	depends on !X86_PAE
2169
	select GPIOLIB
2170
	select OF
2171
	select OF_PROMTREE
2172
	select IRQ_DOMAIN
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2173
	---help---
2174 2175 2176
	  Add support for detecting the unique features of the OLPC
	  XO hardware.

2177 2178
config OLPC_XO1_PM
	bool "OLPC XO-1 Power Management"
2179
	depends on OLPC && MFD_CS5535 && PM_SLEEP
2180
	select MFD_CORE
2181
	---help---
2182
	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
2183

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2184 2185 2186 2187 2188 2189 2190
config OLPC_XO1_RTC
	bool "OLPC XO-1 Real Time Clock"
	depends on OLPC_XO1_PM && RTC_DRV_CMOS
	---help---
	  Add support for the XO-1 real time clock, which can be used as a
	  programmable wakeup source.

2191 2192
config OLPC_XO1_SCI
	bool "OLPC XO-1 SCI extras"
2193
	depends on OLPC && OLPC_XO1_PM
2194
	depends on INPUT=y
2195
	select POWER_SUPPLY
2196 2197 2198 2199
	select GPIO_CS5535
	select MFD_CORE
	---help---
	  Add support for SCI-based features of the OLPC XO-1 laptop:
2200
	   - EC-driven system wakeups
2201
	   - Power button
2202
	   - Ebook switch
2203
	   - Lid switch
2204 2205
	   - AC adapter status updates
	   - Battery status updates
2206

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2207 2208
config OLPC_XO15_SCI
	bool "OLPC XO-1.5 SCI extras"
2209 2210
	depends on OLPC && ACPI
	select POWER_SUPPLY
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2211 2212 2213 2214 2215
	---help---
	  Add support for SCI-based features of the OLPC XO-1.5 laptop:
	   - EC-driven system wakeups
	   - AC adapter status updates
	   - Battery status updates
2216

2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230
config ALIX
	bool "PCEngines ALIX System Support (LED setup)"
	select GPIOLIB
	---help---
	  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.

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config NET5501
	bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
	select GPIOLIB
	---help---
	  This option enables system support for the Soekris Engineering net5501.

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config GEOS
	bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
	select GPIOLIB
	depends on DMI
	---help---
	  This option enables system support for the Traverse Technologies GEOS.

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config TS5500
	bool "Technologic Systems TS-5500 platform support"
	depends on MELAN
	select CHECK_SIGNATURE
	select NEW_LEDS
	select LEDS_CLASS
	---help---
	  This option enables system support for the Technologic Systems TS-5500.

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endif # X86_32

2255
config AMD_NB
2256
	def_bool y
2257
	depends on CPU_SUP_AMD && PCI
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source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

2263
config RAPIDIO
2264
	tristate "RapidIO support"
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	depends on PCI
	default n
	help
2268
	  If enabled this option will include drivers and the core
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	  infrastructure code to support RapidIO interconnect devices.

source "drivers/rapidio/Kconfig"

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endmenu


menu "Executable file formats / Emulations"

source "fs/Kconfig.binfmt"

config IA32_EMULATION
	bool "IA32 Emulation"
	depends on X86_64
2283
	select BINFMT_ELF
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	select COMPAT_BINFMT_ELF
2285
	select HAVE_UID16
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	---help---
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	  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.
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config IA32_AOUT
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	tristate "IA32 a.out support"
	depends on IA32_EMULATION
	---help---
	  Support old a.out binaries in the 32bit emulation.
2296

2297
config X86_X32
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	bool "x32 ABI for 64-bit mode"
	depends on X86_64 && IA32_EMULATION
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	---help---
	  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.

2310
config COMPAT
2311
	def_bool y
2312
	depends on IA32_EMULATION || X86_X32
2313
	select ARCH_WANT_OLD_COMPAT_IPC
2314

2315
if COMPAT
2316
config COMPAT_FOR_U64_ALIGNMENT
2317
	def_bool y
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config SYSVIPC_COMPAT
2320
	def_bool y
2321
	depends on SYSVIPC
2322

2323
config KEYS_COMPAT
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	def_bool y
	depends on KEYS
endif
2327

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endmenu


K
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config HAVE_ATOMIC_IOMAP
	def_bool y
	depends on X86_32

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config HAVE_TEXT_POKE_SMP
	bool
	select STOP_MACHINE if SMP

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config X86_DEV_DMA_OPS
	bool
2341
	depends on X86_64 || STA2X11
2342

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config X86_DMA_REMAP
	bool
2345
	depends on STA2X11
2346

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source "net/Kconfig"

source "drivers/Kconfig"

source "drivers/firmware/Kconfig"

source "fs/Kconfig"

source "arch/x86/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

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source "arch/x86/kvm/Kconfig"

2363
source "lib/Kconfig"