Kconfig 71.0 KB
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# Select 32 or 64 bit
config 64BIT
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	bool "64-bit kernel" if ARCH = "x86"
	default ARCH = "x86_64"
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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 HAVE_AOUT if X86_32
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	select HAVE_UNSTABLE_SCHED_CLOCK
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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_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_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_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 && !M386
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	select HAVE_CMPXCHG_LOCAL if !M386
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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
	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_RCU_USER_QS if X86_64
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	select HAVE_IRQ_TIME_ACCOUNTING
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	select GENERIC_KERNEL_THREAD
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	select GENERIC_KERNEL_EXECVE
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	select MODULES_USE_ELF_REL if X86_32
	select MODULES_USE_ELF_RELA if X86_64
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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 GENERIC_GPIO
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	bool
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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_GENERIC_SPINLOCK
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	def_bool y
	depends on !X86_XADD
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config RWSEM_XCHGADD_ALGORITHM
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	def_bool y
	depends on X86_XADD
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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_DEFAULT_IDLE
	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 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 EXPERIMENTAL && 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
	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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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:
		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
	---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 PARAVIRT_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_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_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.

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config SCHED_OMIT_FRAME_POINTER
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	def_bool y
	prompt "Single-depth WCHAN output"
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	depends on X86
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	---help---
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	  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".

menuconfig PARAVIRT_GUEST
	bool "Paravirtualized guest support"
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	---help---
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	  Say Y here to get to see options related to running Linux under
	  various hypervisors.  This option alone does not add any kernel code.

	  If you say N, all options in this submenu will be skipped and disabled.

if PARAVIRT_GUEST

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config PARAVIRT_TIME_ACCOUNTING
	bool "Paravirtual steal time accounting"
	select PARAVIRT
	default n
	---help---
	  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.

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source "arch/x86/xen/Kconfig"

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config KVM_GUEST
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	bool "KVM Guest support (including kvmclock)"
	select PARAVIRT
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	select PARAVIRT
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	select PARAVIRT_CLOCK
	default y if PARAVIRT_GUEST
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	---help---
	  This option enables various optimizations for running under the KVM
604 605 606 607
	  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
608

609 610
source "arch/x86/lguest/Kconfig"

611 612
config PARAVIRT
	bool "Enable paravirtualization code"
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	---help---
614 615 616 617 618
	  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.

619 620 621 622 623 624 625 626 627 628 629 630 631
config PARAVIRT_SPINLOCKS
	bool "Paravirtualization layer for spinlocks"
	depends on PARAVIRT && SMP && EXPERIMENTAL
	---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.

632 633 634
config PARAVIRT_CLOCK
	bool

635 636
endif

637
config PARAVIRT_DEBUG
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	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.
643

644
config NO_BOOTMEM
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	def_bool y
646

647 648
config MEMTEST
	bool "Memtest"
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	---help---
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	  This option adds a kernel parameter 'memtest', which allows memtest
651
	  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.
657 658

config X86_SUMMIT_NUMA
659
	def_bool y
660
	depends on X86_32 && NUMA && X86_32_NON_STANDARD
661 662

config X86_CYCLONE_TIMER
663
	def_bool y
664
	depends on X86_SUMMIT
665 666 667 668

source "arch/x86/Kconfig.cpu"

config HPET_TIMER
669
	def_bool X86_64
670
	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>.
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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.
684

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	  Choose N to continue using the legacy 8254 timer.
686 687

config HPET_EMULATE_RTC
688
	def_bool y
689
	depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
690

691
config APB_TIMER
692 693
       def_bool y if X86_INTEL_MID
       prompt "Intel MID APB Timer Support" if X86_INTEL_MID
694
       select DW_APB_TIMER
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       depends on X86_INTEL_MID && SFI
696 697 698 699 700 701 702
       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.

703
# Mark as expert because too many people got it wrong.
704
# The code disables itself when not needed.
705 706
config DMI
	default y
707
	bool "Enable DMI scanning" if EXPERT
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	---help---
709 710 711 712 713
	  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.

714
config GART_IOMMU
715
	bool "GART IOMMU support" if EXPERT
716 717
	default y
	select SWIOTLB
718
	depends on X86_64 && PCI && AMD_NB
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	---help---
720 721 722 723 724 725 726 727 728 729 730 731 732 733
	  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
	depends on X86_64 && PCI && EXPERIMENTAL
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	---help---
735 736 737 738 739 740 741 742 743 744 745 746 747 748
	  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
749 750
	def_bool y
	prompt "Should Calgary be enabled by default?"
751
	depends on CALGARY_IOMMU
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	---help---
753 754 755 756 757 758 759 760
	  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---
763
	  Support for software bounce buffers used on x86-64 systems
764 765 766 767
	  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.
768

769
config IOMMU_HELPER
770 771
	def_bool y
	depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
772

773
config MAXSMP
774
	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
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	depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
	select CPUMASK_OFFSTACK
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	---help---
778
	  Enable maximum number of CPUS and NUMA Nodes for this architecture.
779
	  If unsure, say N.
780 781

config NR_CPUS
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	int "Maximum number of CPUs" if SMP && !MAXSMP
783
	range 2 8 if SMP && X86_32 && !X86_BIGSMP
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	range 2 512 if SMP && !MAXSMP
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	default "1" if !SMP
786
	default "4096" if MAXSMP
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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---
790
	  This allows you to specify the maximum number of CPUs which this
791
	  kernel will support.  The maximum supported value is 512 and the
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	  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"
799
	depends on X86_HT
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	---help---
801 802 803 804 805 806
	  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
807 808
	def_bool y
	prompt "Multi-core scheduler support"
809
	depends on X86_HT
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	---help---
811 812 813 814 815 816 817 818
	  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"
819
	depends on X86_32 && !SMP && !X86_32_NON_STANDARD
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	---help---
821 822 823 824 825 826 827 828 829 830 831 832
	  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---
834 835 836 837 838 839 840 841 842
	  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
843
	def_bool y
844
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
845 846

config X86_IO_APIC
847
	def_bool y
848
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
849 850

config X86_VISWS_APIC
851
	def_bool y
852 853
	depends on X86_32 && X86_VISWS

854 855 856
config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
	bool "Reroute for broken boot IRQs"
	depends on X86_IO_APIC
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	---help---
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
	  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.

877
config X86_MCE
878
	bool "Machine Check / overheating reporting"
879
	default y
880
	---help---
881 882
	  Machine Check support allows the processor to notify the
	  kernel if it detects a problem (e.g. overheating, data corruption).
883
	  The action the kernel takes depends on the severity of the problem,
884
	  ranging from warning messages to halting the machine.
885

886
config X86_MCE_INTEL
887 888
	def_bool y
	prompt "Intel MCE features"
889
	depends on X86_MCE && X86_LOCAL_APIC
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	---help---
891 892 893 894
	   Additional support for intel specific MCE features such as
	   the thermal monitor.

config X86_MCE_AMD
895 896
	def_bool y
	prompt "AMD MCE features"
897
	depends on X86_MCE && X86_LOCAL_APIC
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	---help---
899 900 901
	   Additional support for AMD specific MCE features such as
	   the DRAM Error Threshold.

902
config X86_ANCIENT_MCE
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	bool "Support for old Pentium 5 / WinChip machine checks"
904
	depends on X86_32 && X86_MCE
905 906 907 908
	---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.
909

910 911
config X86_MCE_THRESHOLD
	depends on X86_MCE_AMD || X86_MCE_INTEL
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	def_bool y
913

914
config X86_MCE_INJECT
915
	depends on X86_MCE
916 917 918 919 920 921
	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.

922 923
config X86_THERMAL_VECTOR
	def_bool y
924
	depends on X86_MCE_INTEL
925

926
config VM86
927
	bool "Enable VM86 support" if EXPERT
928 929
	default y
	depends on X86_32
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	---help---
	  This option is required by programs like DOSEMU to run 16-bit legacy
932
	  code on X86 processors. It also may be needed by software like
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	  XFree86 to initialize some video cards via BIOS. Disabling this
	  option saves about 6k.
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953

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"
954
	select HWMON
955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
	---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
974 975
	bool "Enable X86 board specific fixups for reboot"
	depends on X86_32
976 977 978 979 980 981 982 983
	---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
984
	  CS5530A and CS5536 chipsets and the RDC R-321x SoC.
985 986 987 988 989 990

	  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
991
	tristate "CPU microcode loading support"
992 993
	select FW_LOADER
	---help---
994

995
	  If you say Y here, you will be able to update the microcode on
996
	  certain Intel and AMD processors. The Intel support is for the
997 998 999 1000
	  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.
1001

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	  This option selects the general module only, you need to select
	  at least one vendor specific module as well.
1004

1005 1006
	  To compile this driver as a module, choose M here: the module
	  will be called microcode.
1007

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config MICROCODE_INTEL
1009
	bool "Intel microcode loading support"
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1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
	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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1021
config MICROCODE_AMD
1022
	bool "AMD microcode loading support"
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1023 1024 1025 1026 1027
	depends on MICROCODE
	select FW_LOADER
	---help---
	  If you select this option, microcode patch loading support for AMD
	  processors will be enabled.
1028

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config MICROCODE_OLD_INTERFACE
1030
	def_bool y
1031 1032 1033 1034
	depends on MICROCODE

config X86_MSR
	tristate "/dev/cpu/*/msr - Model-specific register support"
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	---help---
1036 1037 1038 1039 1040 1041 1042 1043
	  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---
1045 1046 1047 1048 1049 1050 1051 1052
	  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
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
	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---
1097 1098 1099 1100 1101 1102 1103
	  Select this if you have a 32-bit processor and between 1 and 4
	  gigabytes of physical RAM.

config HIGHMEM64G
	bool "64GB"
	depends on !M386 && !M486
	select X86_PAE
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	---help---
1105 1106 1107 1108 1109 1110 1111
	  Select this if you have a 32-bit processor and more than 4
	  gigabytes of physical RAM.

endchoice

choice
	depends on EXPERIMENTAL
1112
	prompt "Memory split" if EXPERT
1113 1114
	default VMSPLIT_3G
	depends on X86_32
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	---help---
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 1152 1153 1154
	  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
1155
	def_bool y
1156 1157 1158
	depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)

config X86_PAE
1159
	bool "PAE (Physical Address Extension) Support"
1160
	depends on X86_32 && !HIGHMEM4G
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	---help---
1162 1163 1164 1165 1166
	  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.

1167
config ARCH_PHYS_ADDR_T_64BIT
1168 1169
	def_bool y
	depends on X86_64 || X86_PAE
1170

1171
config ARCH_DMA_ADDR_T_64BIT
1172 1173
	def_bool y
	depends on X86_64 || HIGHMEM64G
1174

1175
config DIRECT_GBPAGES
1176
	bool "Enable 1GB pages for kernel pagetables" if EXPERT
1177 1178
	default y
	depends on X86_64
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	---help---
1180 1181 1182 1183
	  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".

1184 1185
# Common NUMA Features
config NUMA
1186
	bool "Numa Memory Allocation and Scheduler Support"
1187
	depends on SMP
1188
	depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
1189
	default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
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	---help---
1191
	  Enable NUMA (Non Uniform Memory Access) support.
1192

1193 1194 1195 1196
	  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.

1197
	  For 64-bit this is recommended if the system is Intel Core i7
1198 1199 1200 1201 1202 1203 1204
	  (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.
1205 1206 1207 1208

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

1209
config AMD_NUMA
1210 1211
	def_bool y
	prompt "Old style AMD Opteron NUMA detection"
1212
	depends on X86_64 && NUMA && PCI
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	---help---
1214 1215 1216 1217 1218
	  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.
1219 1220

config X86_64_ACPI_NUMA
1221 1222
	def_bool y
	prompt "ACPI NUMA detection"
1223 1224
	depends on X86_64 && NUMA && ACPI && PCI
	select ACPI_NUMA
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	---help---
1226 1227
	  Enable ACPI SRAT based node topology detection.

1228 1229 1230 1231 1232 1233 1234 1235 1236
# 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

1237 1238
config NUMA_EMU
	bool "NUMA emulation"
1239
	depends on NUMA
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	---help---
1241 1242 1243 1244 1245
	  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
1246
	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
1247 1248
	range 1 10
	default "10" if MAXSMP
1249 1250 1251 1252
	default "6" if X86_64
	default "4" if X86_NUMAQ
	default "3"
	depends on NEED_MULTIPLE_NODES
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	---help---
1254
	  Specify the maximum number of NUMA Nodes available on the target
1255
	  system.  Increases memory reserved to accommodate various tables.
1256

1257 1258 1259 1260
config HAVE_ARCH_ALLOC_REMAP
	def_bool y
	depends on X86_32 && NUMA

1261
config ARCH_HAVE_MEMORY_PRESENT
1262
	def_bool y
1263 1264 1265
	depends on X86_32 && DISCONTIGMEM

config NEED_NODE_MEMMAP_SIZE
1266
	def_bool y
1267 1268 1269 1270
	depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)

config ARCH_FLATMEM_ENABLE
	def_bool y
1271
	depends on X86_32 && !NUMA
1272 1273 1274

config ARCH_DISCONTIGMEM_ENABLE
	def_bool y
1275
	depends on NUMA && X86_32
1276 1277 1278

config ARCH_DISCONTIGMEM_DEFAULT
	def_bool y
1279 1280
	depends on NUMA && X86_32

1281 1282
config ARCH_SPARSEMEM_ENABLE
	def_bool y
1283
	depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
1284 1285 1286
	select SPARSEMEM_STATIC if X86_32
	select SPARSEMEM_VMEMMAP_ENABLE if X86_64

1287 1288 1289 1290
config ARCH_SPARSEMEM_DEFAULT
	def_bool y
	depends on X86_64

1291 1292
config ARCH_SELECT_MEMORY_MODEL
	def_bool y
1293
	depends on ARCH_SPARSEMEM_ENABLE
1294 1295

config ARCH_MEMORY_PROBE
1296 1297
	def_bool y
	depends on X86_64 && MEMORY_HOTPLUG
1298

1299 1300 1301 1302
config ARCH_PROC_KCORE_TEXT
	def_bool y
	depends on X86_64 && PROC_KCORE

1303 1304 1305 1306 1307
config ILLEGAL_POINTER_VALUE
       hex
       default 0 if X86_32
       default 0xdead000000000000 if X86_64

1308 1309 1310 1311
source "mm/Kconfig"

config HIGHPTE
	bool "Allocate 3rd-level pagetables from highmem"
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	depends on HIGHMEM
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	---help---
1314 1315 1316 1317 1318
	  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.

1319
config X86_CHECK_BIOS_CORRUPTION
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	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.
1340

1341
config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
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	bool "Set the default setting of memory_corruption_check"
1343 1344
	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.
1348

1349
config X86_RESERVE_LOW
1350 1351 1352
	int "Amount of low memory, in kilobytes, to reserve for the BIOS"
	default 64
	range 4 640
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	---help---
1354 1355 1356 1357 1358 1359 1360 1361 1362
	  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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1364 1365 1366 1367 1368
	  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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1370 1371 1372 1373 1374
	  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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1376
	  Leave this to the default value of 64 if you are unsure.
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1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
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
1406
	prompt "MTRR (Memory Type Range Register) support" if EXPERT
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
	---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.

1437
	  See <file:Documentation/x86/mtrr.txt> for more information.
1438

1439
config MTRR_SANITIZER
1440
	def_bool y
1441 1442
	prompt "MTRR cleanup support"
	depends on MTRR
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	---help---
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	  Convert MTRR layout from continuous to discrete, so X drivers can
	  add writeback entries.
1446

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	  Can be disabled with disable_mtrr_cleanup on the kernel command line.
1448
	  The largest mtrr entry size for a continuous block can be set with
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	  mtrr_chunk_size.
1450

1451
	  If unsure, say Y.
1452 1453

config MTRR_SANITIZER_ENABLE_DEFAULT
1454 1455 1456
	int "MTRR cleanup enable value (0-1)"
	range 0 1
	default "0"
1457
	depends on MTRR_SANITIZER
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	---help---
1459
	  Enable mtrr cleanup default value
1460

1461 1462 1463 1464 1465
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---
1467
	  mtrr cleanup spare entries default, it can be changed via
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	  mtrr_spare_reg_nr=N on the kernel command line.
1469

1470
config X86_PAT
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	def_bool y
1472
	prompt "x86 PAT support" if EXPERT
1473
	depends on MTRR
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	---help---
1475
	  Use PAT attributes to setup page level cache control.
1476

1477 1478 1479 1480
	  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,
1481
	  spontaneous reboots) or a non-working video driver.
1482 1483 1484

	  If unsure, say Y.

1485 1486 1487 1488
config ARCH_USES_PG_UNCACHED
	def_bool y
	depends on X86_PAT

1489 1490 1491 1492 1493 1494 1495 1496 1497
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.

1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508
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.

1509
config EFI
1510
	bool "EFI runtime service support"
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	depends on ACPI
1512
	---help---
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1513 1514
	  This enables the kernel to use EFI runtime services that are
	  available (such as the EFI variable services).
1515

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	  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.
1522

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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.

1530 1531
	  See Documentation/x86/efi-stub.txt for more information.

1532
config SECCOMP
1533 1534
	def_bool y
	prompt "Enable seccomp to safely compute untrusted bytecode"
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	---help---
1536 1537 1538 1539 1540 1541
	  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
1542
	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1543 1544 1545 1546 1547 1548
	  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
1549
	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
1554 1555 1556 1557 1558 1559 1560
	  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)
1563 1564 1565 1566 1567

source kernel/Kconfig.hz

config KEXEC
	bool "kexec system call"
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	---help---
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
	  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
1583
	bool "kernel crash dumps"
1584
	depends on X86_64 || (X86_32 && HIGHMEM)
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	---help---
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
	  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
	bool "kexec jump (EXPERIMENTAL)"
	depends on EXPERIMENTAL
1599
	depends on KEXEC && HIBERNATION
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	---help---
1601 1602
	  Jump between original kernel and kexeced kernel and invoke
	  code in physical address mode via KEXEC
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1604
config PHYSICAL_START
1605
	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
1606
	default "0x1000000"
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	---help---
1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
	  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.

1625 1626 1627 1628 1629 1630 1631 1632 1633
	  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.
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645

	  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
1646 1647
	bool "Build a relocatable kernel"
	default y
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	---help---
1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
	  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.

1662 1663 1664 1665 1666
# Relocation on x86-32 needs some additional build support
config X86_NEED_RELOCS
	def_bool y
	depends on X86_32 && RELOCATABLE

1667
config PHYSICAL_ALIGN
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	hex "Alignment value to which kernel should be aligned" if X86_32
1669 1670
	default "0x1000000"
	range 0x2000 0x1000000
I
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1671
	---help---
1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690
	  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
1691
	bool "Support for hot-pluggable CPUs"
1692
	depends on SMP && HOTPLUG
1693
	---help---
1694 1695 1696 1697 1698
	  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.
1699 1700

config COMPAT_VDSO
1701 1702
	def_bool y
	prompt "Compat VDSO support"
R
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1703
	depends on X86_32 || IA32_EMULATION
I
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1704
	---help---
R
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1705
	  Map the 32-bit VDSO to the predictable old-style address too.
R
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1707 1708 1709 1710 1711 1712
	  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.

1713 1714
config CMDLINE_BOOL
	bool "Built-in kernel command line"
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	---help---
1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732
	  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---
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
	  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---
1750 1751 1752 1753 1754 1755
	  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.

1756 1757 1758 1759 1760 1761
endmenu

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

1762 1763 1764 1765
config ARCH_ENABLE_MEMORY_HOTREMOVE
	def_bool y
	depends on MEMORY_HOTPLUG

1766
config USE_PERCPU_NUMA_NODE_ID
1767
	def_bool y
1768 1769
	depends on NUMA

1770
menu "Power management and ACPI options"
1771 1772

config ARCH_HIBERNATION_HEADER
1773
	def_bool y
1774 1775 1776 1777 1778 1779
	depends on X86_64 && HIBERNATION

source "kernel/power/Kconfig"

source "drivers/acpi/Kconfig"

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1780 1781
source "drivers/sfi/Kconfig"

1782
config X86_APM_BOOT
J
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1783
	def_bool y
1784
	depends on APM
1785

1786 1787
menuconfig APM
	tristate "APM (Advanced Power Management) BIOS support"
1788
	depends on X86_32 && PM_SLEEP
1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
	---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
1804 1805
	  and more information, read <file:Documentation/power/apm-acpi.txt>
	  and the Battery Powered Linux mini-HOWTO, available from
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
	  <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---
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872
	  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
	bool "Make CPU Idle calls when idle"
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	---help---
1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
	  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---
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896
	  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---
1898 1899 1900 1901 1902 1903 1904 1905 1906
	  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

1907
source "drivers/cpufreq/Kconfig"
1908 1909 1910

source "drivers/cpuidle/Kconfig"

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source "drivers/idle/Kconfig"

1913 1914 1915 1916 1917 1918
endmenu


menu "Bus options (PCI etc.)"

config PCI
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1919
	bool "PCI support"
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	default y
1921
	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
I
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1922
	---help---
1923 1924 1925 1926 1927 1928 1929
	  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"
1930
	depends on X86_32 && PCI
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
	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"

1956
config PCI_GOOLPC
1957
	bool "OLPC XO-1"
1958 1959
	depends on OLPC

1960 1961 1962
config PCI_GOANY
	bool "Any"

1963 1964 1965
endchoice

config PCI_BIOS
1966
	def_bool y
1967
	depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
1968 1969 1970

# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
config PCI_DIRECT
1971
	def_bool y
1972
	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
1973 1974

config PCI_MMCONFIG
1975
	def_bool y
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1976
	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
1977

1978
config PCI_OLPC
1979 1980
	def_bool y
	depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
1981

1982 1983 1984 1985 1986
config PCI_XEN
	def_bool y
	depends on PCI && XEN
	select SWIOTLB_XEN

1987
config PCI_DOMAINS
1988
	def_bool y
1989 1990 1991 1992 1993 1994
	depends on PCI

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

1995
config PCI_CNB20LE_QUIRK
1996
	bool "Read CNB20LE Host Bridge Windows" if EXPERT
1997
	depends on PCI && EXPERIMENTAL
1998 1999 2000 2001 2002
	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.

2003 2004 2005 2006 2007
	  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.

2008 2009 2010 2011
source "drivers/pci/pcie/Kconfig"

source "drivers/pci/Kconfig"

2012
# x86_64 have no ISA slots, but can have ISA-style DMA.
2013
config ISA_DMA_API
2014 2015 2016 2017 2018
	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.
2019 2020 2021 2022 2023

if X86_32

config ISA
	bool "ISA support"
I
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	---help---
2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050
	  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"
I
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2051
	---help---
2052 2053 2054 2055 2056 2057 2058 2059 2060
	  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"
J
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2061
	depends on SCx200
2062
	default y
I
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2063
	---help---
2064 2065 2066 2067 2068 2069
	  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.

2070 2071
config OLPC
	bool "One Laptop Per Child support"
2072
	depends on !X86_PAE
2073
	select GPIOLIB
2074
	select OF
2075
	select OF_PROMTREE
2076
	select IRQ_DOMAIN
I
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2077
	---help---
2078 2079 2080
	  Add support for detecting the unique features of the OLPC
	  XO hardware.

2081 2082
config OLPC_XO1_PM
	bool "OLPC XO-1 Power Management"
2083
	depends on OLPC && MFD_CS5535 && PM_SLEEP
2084
	select MFD_CORE
2085
	---help---
2086
	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
2087

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2088 2089 2090 2091 2092 2093 2094
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.

2095 2096
config OLPC_XO1_SCI
	bool "OLPC XO-1 SCI extras"
2097 2098
	depends on OLPC && OLPC_XO1_PM
	select POWER_SUPPLY
2099 2100 2101 2102
	select GPIO_CS5535
	select MFD_CORE
	---help---
	  Add support for SCI-based features of the OLPC XO-1 laptop:
2103
	   - EC-driven system wakeups
2104
	   - Power button
2105
	   - Ebook switch
2106
	   - Lid switch
2107 2108
	   - AC adapter status updates
	   - Battery status updates
2109

D
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2110 2111
config OLPC_XO15_SCI
	bool "OLPC XO-1.5 SCI extras"
2112 2113
	depends on OLPC && ACPI
	select POWER_SUPPLY
D
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2114 2115 2116 2117 2118
	---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
2119

2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133
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.

2134 2135 2136 2137 2138 2139
config NET5501
	bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
	select GPIOLIB
	---help---
	  This option enables system support for the Soekris Engineering net5501.

2140 2141 2142 2143 2144 2145 2146
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.

2147 2148
endif # X86_32

2149
config AMD_NB
2150
	def_bool y
2151
	depends on CPU_SUP_AMD && PCI
2152 2153 2154 2155 2156

source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
config RAPIDIO
	bool "RapidIO support"
	depends on PCI
	default n
	help
	  If you say Y here, the kernel will include drivers and
	  infrastructure code to support RapidIO interconnect devices.

source "drivers/rapidio/Kconfig"

2167 2168 2169 2170 2171 2172 2173 2174 2175 2176
endmenu


menu "Executable file formats / Emulations"

source "fs/Kconfig.binfmt"

config IA32_EMULATION
	bool "IA32 Emulation"
	depends on X86_64
R
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2177
	select COMPAT_BINFMT_ELF
2178
	select HAVE_UID16
I
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2179
	---help---
H
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2180 2181 2182
	  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.
2183 2184

config IA32_AOUT
I
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2185 2186 2187 2188
	tristate "IA32 a.out support"
	depends on IA32_EMULATION
	---help---
	  Support old a.out binaries in the 32bit emulation.
2189

2190
config X86_X32
H
H. J. Lu 已提交
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
	bool "x32 ABI for 64-bit mode (EXPERIMENTAL)"
	depends on X86_64 && IA32_EMULATION && EXPERIMENTAL
	---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.

2203
config COMPAT
2204
	def_bool y
2205
	depends on IA32_EMULATION || X86_X32
2206
	select ARCH_WANT_OLD_COMPAT_IPC
2207

2208
if COMPAT
2209
config COMPAT_FOR_U64_ALIGNMENT
2210
	def_bool y
2211 2212

config SYSVIPC_COMPAT
2213
	def_bool y
2214
	depends on SYSVIPC
2215

2216
config KEYS_COMPAT
2217 2218 2219
	def_bool y
	depends on KEYS
endif
2220

2221 2222 2223
endmenu


K
Keith Packard 已提交
2224 2225 2226 2227
config HAVE_ATOMIC_IOMAP
	def_bool y
	depends on X86_32

2228 2229 2230 2231
config HAVE_TEXT_POKE_SMP
	bool
	select STOP_MACHINE if SMP

2232 2233
config X86_DEV_DMA_OPS
	bool
2234
	depends on X86_64 || STA2X11
2235

2236 2237
config X86_DMA_REMAP
	bool
2238
	depends on STA2X11
2239

2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253
source "net/Kconfig"

source "drivers/Kconfig"

source "drivers/firmware/Kconfig"

source "fs/Kconfig"

source "arch/x86/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

2254 2255
source "arch/x86/kvm/Kconfig"

2256
source "lib/Kconfig"