Kconfig 76.3 KB
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# Select 32 or 64 bit
config 64BIT
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	bool "64-bit kernel" if ARCH = "x86"
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	default ARCH != "i386"
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	---help---
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	  Say yes to build a 64-bit kernel - formerly known as x86_64
	  Say no to build a 32-bit kernel - formerly known as i386

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

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

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config MMU
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	def_bool y
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config SBUS
	bool

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

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

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config ARCH_HAS_CPU_RELAX
	def_bool y

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config ARCH_HAS_CACHE_LINE_SIZE
	def_bool y

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config ARCH_HAS_CPU_AUTOPROBE
	def_bool y

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config HAVE_SETUP_PER_CPU_AREA
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	def_bool y
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config NEED_PER_CPU_EMBED_FIRST_CHUNK
	def_bool y

config NEED_PER_CPU_PAGE_FIRST_CHUNK
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	def_bool y

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config ARCH_HIBERNATION_POSSIBLE
	def_bool y

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config ARCH_SUSPEND_POSSIBLE
	def_bool y

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config ARCH_WANT_HUGE_PMD_SHARE
	def_bool y

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config ARCH_WANT_GENERAL_HUGETLB
	def_bool y

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config ZONE_DMA32
	bool
	default X86_64

config AUDIT_ARCH
	bool
	default X86_64

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config ARCH_SUPPORTS_OPTIMIZED_INLINING
	def_bool y

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config ARCH_SUPPORTS_DEBUG_PAGEALLOC
	def_bool y

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

config X86_64_SMP
	def_bool y
	depends on X86_64 && SMP

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

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config ARCH_CPU_PROBE_RELEASE
	def_bool y
	depends on HOTPLUG_CPU

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config ARCH_SUPPORTS_UPROBES
	def_bool y

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

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config ZONE_DMA
	bool "DMA memory allocation support" if EXPERT
	default y
	help
	  DMA memory allocation support allows devices with less than 32-bit
	  addressing to allocate within the first 16MB of address space.
	  Disable if no such devices will be used.

	  If unsure, say Y.

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

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on many, but not all,
	  singleprocessor machines. On a singleprocessor machine, the kernel
	  will run faster if you say N here.

	  Note that if you say Y here and choose architecture "586" or
	  "Pentium" under "Processor family", the kernel will not work on 486
	  architectures. Similarly, multiprocessor kernels for the "PPro"
	  architecture may not work on all Pentium based boards.

	  People using multiprocessor machines who say Y here should also say
	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
	  Management" code will be disabled if you say Y here.

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

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

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config X86_X2APIC
	bool "Support x2apic"
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	depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
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	---help---
	  This enables x2apic support on CPUs that have this feature.

	  This allows 32-bit apic IDs (so it can support very large systems),
	  and accesses the local apic via MSRs not via mmio.

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

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config X86_MPPARSE
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	bool "Enable MPS table" if ACPI || SFI
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	default y
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	depends on X86_LOCAL_APIC
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	---help---
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	  For old smp systems that do not have proper acpi support. Newer systems
	  (esp with 64bit cpus) with acpi support, MADT and DSDT will override it

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

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

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	  If you enable this option then you'll be able to select support
	  for the following (non-PC) 32 bit x86 platforms:
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		Goldfish (Android emulator)
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		AMD Elan
		NUMAQ (IBM/Sequent)
		RDC R-321x SoC
		SGI 320/540 (Visual Workstation)
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		STA2X11-based (e.g. Northville)
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		Summit/EXA (IBM x440)
		Unisys ES7000 IA32 series
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		Moorestown MID devices
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	  If you have one of these systems, or if you want to build a
	  generic distribution kernel, say Y here - otherwise say N.
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endif
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if X86_64
config X86_EXTENDED_PLATFORM
	bool "Support for extended (non-PC) x86 platforms"
	default y
	---help---
	  If you disable this option then the kernel will only support
	  standard PC platforms. (which covers the vast majority of
	  systems out there.)

	  If you enable this option then you'll be able to select support
	  for the following (non-PC) 64 bit x86 platforms:
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		Numascale NumaChip
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		ScaleMP vSMP
		SGI Ultraviolet

	  If you have one of these systems, or if you want to build a
	  generic distribution kernel, say Y here - otherwise say N.
endif
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# This is an alphabetically sorted list of 64 bit extended platforms
# Please maintain the alphabetic order if and when there are additions
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config X86_NUMACHIP
	bool "Numascale NumaChip"
	depends on X86_64
	depends on X86_EXTENDED_PLATFORM
	depends on NUMA
	depends on SMP
	depends on X86_X2APIC
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	depends on PCI_MMCONFIG
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	---help---
	  Adds support for Numascale NumaChip large-SMP systems. Needed to
	  enable more than ~168 cores.
	  If you don't have one of these, you should say N here.
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config X86_VSMP
	bool "ScaleMP vSMP"
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	select HYPERVISOR_GUEST
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	select PARAVIRT
	depends on X86_64 && PCI
	depends on X86_EXTENDED_PLATFORM
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	depends on SMP
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	---help---
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	  Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is
	  supposed to run on these EM64T-based machines.  Only choose this option
	  if you have one of these machines.
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config X86_UV
	bool "SGI Ultraviolet"
	depends on X86_64
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	depends on X86_EXTENDED_PLATFORM
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	depends on NUMA
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	depends on X86_X2APIC
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	---help---
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	  This option is needed in order to support SGI Ultraviolet systems.
	  If you don't have one of these, you should say N here.

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

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

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

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if X86_WANT_INTEL_MID
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config X86_INTEL_MID
	bool

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

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endif

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

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config X86_RDC321X
	bool "RDC R-321x SoC"
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	depends on X86_32
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	depends on X86_EXTENDED_PLATFORM
	select M486
	select X86_REBOOTFIXUPS
	---help---
	  This option is needed for RDC R-321x system-on-chip, also known
	  as R-8610-(G).
	  If you don't have one of these chips, you should say N here.

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config X86_32_NON_STANDARD
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	bool "Support non-standard 32-bit SMP architectures"
	depends on X86_32 && SMP
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	depends on X86_EXTENDED_PLATFORM
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	---help---
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	  This option compiles in the NUMAQ, Summit, bigsmp, ES7000,
	  STA2X11, default subarchitectures.  It is intended for a generic
	  binary kernel. If you select them all, kernel will probe it
	  one by one and will fallback to default.
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# Alphabetically sorted list of Non standard 32 bit platforms
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config X86_NUMAQ
	bool "NUMAQ (IBM/Sequent)"
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	depends on X86_32_NON_STANDARD
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	depends on PCI
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	select NUMA
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	select X86_MPPARSE
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	---help---
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	  This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
	  NUMA multiquad box. This changes the way that processors are
	  bootstrapped, and uses Clustered Logical APIC addressing mode instead
	  of Flat Logical.  You will need a new lynxer.elf file to flash your
	  firmware with - send email to <Martin.Bligh@us.ibm.com>.
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config X86_SUPPORTS_MEMORY_FAILURE
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	def_bool y
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	# MCE code calls memory_failure():
	depends on X86_MCE
	# On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
	depends on !X86_NUMAQ
	# On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
	depends on X86_64 || !SPARSEMEM
	select ARCH_SUPPORTS_MEMORY_FAILURE

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

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

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

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config STA2X11
	bool "STA2X11 Companion Chip Support"
	depends on X86_32_NON_STANDARD && PCI
	select X86_DEV_DMA_OPS
	select X86_DMA_REMAP
	select SWIOTLB
	select MFD_STA2X11
	select ARCH_REQUIRE_GPIOLIB
	default n
	---help---
	  This adds support for boards based on the STA2X11 IO-Hub,
	  a.k.a. "ConneXt". The chip is used in place of the standard
	  PC chipset, so all "standard" peripherals are missing. If this
	  option is selected the kernel will still be able to boot on
	  standard PC machines.

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

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config X86_32_IRIS
	tristate "Eurobraille/Iris poweroff module"
	depends on X86_32
	---help---
	  The Iris machines from EuroBraille do not have APM or ACPI support
	  to shut themselves down properly.  A special I/O sequence is
	  needed to do so, which is what this module does at
	  kernel shutdown.

	  This is only for Iris machines from EuroBraille.

	  If unused, say N.

593
config SCHED_OMIT_FRAME_POINTER
594 595
	def_bool y
	prompt "Single-depth WCHAN output"
596
	depends on X86
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	---help---
598 599 600 601 602 603 604
	  Calculate simpler /proc/<PID>/wchan values. If this option
	  is disabled then wchan values will recurse back to the
	  caller function. This provides more accurate wchan values,
	  at the expense of slightly more scheduling overhead.

	  If in doubt, say "Y".

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

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

615
if HYPERVISOR_GUEST
616

617 618
config PARAVIRT
	bool "Enable paravirtualization code"
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	---help---
620 621 622 623 624
	  This changes the kernel so it can modify itself when it is run
	  under a hypervisor, potentially improving performance significantly
	  over full virtualization.  However, when run without a hypervisor
	  the kernel is theoretically slower and slightly larger.

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

632 633
config PARAVIRT_SPINLOCKS
	bool "Paravirtualization layer for spinlocks"
634
	depends on PARAVIRT && SMP
635
	select UNINLINE_SPIN_UNLOCK
636 637 638 639 640 641 642 643 644 645
	---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.

646
source "arch/x86/xen/Kconfig"
647

648 649 650 651 652
config KVM_GUEST
	bool "KVM Guest support (including kvmclock)"
	depends on PARAVIRT
	select PARAVIRT_CLOCK
	default y
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	---help---
654 655 656 657 658
	  This option enables various optimizations for running under the KVM
	  hypervisor. It includes a paravirtualized clock, so that instead
	  of relying on a PIT (or probably other) emulation by the
	  underlying device model, the host provides the guest with
	  timing infrastructure such as time of day, and system time
659

660 661 662 663 664 665 666 667 668
config KVM_DEBUG_FS
	bool "Enable debug information for KVM Guests in debugfs"
	depends on KVM_GUEST && DEBUG_FS
	default n
	---help---
	  This option enables collection of various statistics for KVM guest.
	  Statistics are displayed in debugfs filesystem. Enabling this option
	  may incur significant overhead.

669 670 671 672 673 674
source "arch/x86/lguest/Kconfig"

config PARAVIRT_TIME_ACCOUNTING
	bool "Paravirtual steal time accounting"
	depends on PARAVIRT
	default n
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	---help---
676 677 678 679 680 681 682 683 684
	  Select this option to enable fine granularity task steal time
	  accounting. Time spent executing other tasks in parallel with
	  the current vCPU is discounted from the vCPU power. To account for
	  that, there can be a small performance impact.

	  If in doubt, say N here.

config PARAVIRT_CLOCK
	bool
685

686
endif #HYPERVISOR_GUEST
687

688
config NO_BOOTMEM
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	def_bool y
690

691 692
config MEMTEST
	bool "Memtest"
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	---help---
Y
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	  This option adds a kernel parameter 'memtest', which allows memtest
695
	  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.
701 702

config X86_SUMMIT_NUMA
703
	def_bool y
704
	depends on X86_32 && NUMA && X86_32_NON_STANDARD
705 706

config X86_CYCLONE_TIMER
707
	def_bool y
708
	depends on X86_SUMMIT
709 710 711 712

source "arch/x86/Kconfig.cpu"

config HPET_TIMER
713
	def_bool X86_64
714
	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>.
724

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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.
728

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	  Choose N to continue using the legacy 8254 timer.
730 731

config HPET_EMULATE_RTC
732
	def_bool y
733
	depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
734

735
config APB_TIMER
736 737
       def_bool y if X86_INTEL_MID
       prompt "Intel MID APB Timer Support" if X86_INTEL_MID
738
       select DW_APB_TIMER
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       depends on X86_INTEL_MID && SFI
740 741 742 743 744 745 746
       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.

747
# Mark as expert because too many people got it wrong.
748
# The code disables itself when not needed.
749 750
config DMI
	default y
751
	bool "Enable DMI scanning" if EXPERT
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	---help---
753 754 755 756 757
	  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.

758
config GART_IOMMU
759
	bool "GART IOMMU support" if EXPERT
760 761
	default y
	select SWIOTLB
762
	depends on X86_64 && PCI && AMD_NB
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	---help---
764 765 766 767 768 769 770 771 772 773 774 775 776
	  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
777
	depends on X86_64 && PCI
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	---help---
779 780 781 782 783 784 785 786 787 788 789 790 791 792
	  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
793 794
	def_bool y
	prompt "Should Calgary be enabled by default?"
795
	depends on CALGARY_IOMMU
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	---help---
797 798 799 800 801 802 803 804
	  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---
807
	  Support for software bounce buffers used on x86-64 systems
808 809 810 811
	  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.
812

813
config IOMMU_HELPER
814 815
	def_bool y
	depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
816

817
config MAXSMP
818
	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
819
	depends on X86_64 && SMP && DEBUG_KERNEL
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	select CPUMASK_OFFSTACK
I
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821
	---help---
822
	  Enable maximum number of CPUS and NUMA Nodes for this architecture.
823
	  If unsure, say N.
824 825

config NR_CPUS
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	int "Maximum number of CPUs" if SMP && !MAXSMP
827
	range 2 8 if SMP && X86_32 && !X86_BIGSMP
M
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	range 2 512 if SMP && !MAXSMP
M
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	default "1" if !SMP
830
	default "4096" if MAXSMP
M
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	default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
	default "8" if SMP
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	---help---
834
	  This allows you to specify the maximum number of CPUs which this
835
	  kernel will support.  The maximum supported value is 512 and the
836 837 838 839 840 841 842
	  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"
843
	depends on X86_HT
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	---help---
845 846 847 848 849 850
	  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
851 852
	def_bool y
	prompt "Multi-core scheduler support"
853
	depends on X86_HT
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	---help---
855 856 857 858 859 860 861 862
	  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"
863
	depends on X86_32 && !SMP && !X86_32_NON_STANDARD
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	---help---
865 866 867 868 869 870 871 872 873 874 875 876
	  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---
878 879 880 881 882 883 884 885 886
	  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
887
	def_bool y
888
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
889 890

config X86_IO_APIC
891
	def_bool y
892
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
893 894

config X86_VISWS_APIC
895
	def_bool y
896 897
	depends on X86_32 && X86_VISWS

898 899 900
config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
	bool "Reroute for broken boot IRQs"
	depends on X86_IO_APIC
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	---help---
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
	  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.

921
config X86_MCE
922
	bool "Machine Check / overheating reporting"
923
	default y
924
	---help---
925 926
	  Machine Check support allows the processor to notify the
	  kernel if it detects a problem (e.g. overheating, data corruption).
927
	  The action the kernel takes depends on the severity of the problem,
928
	  ranging from warning messages to halting the machine.
929

930
config X86_MCE_INTEL
931 932
	def_bool y
	prompt "Intel MCE features"
933
	depends on X86_MCE && X86_LOCAL_APIC
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934
	---help---
935 936 937 938
	   Additional support for intel specific MCE features such as
	   the thermal monitor.

config X86_MCE_AMD
939 940
	def_bool y
	prompt "AMD MCE features"
941
	depends on X86_MCE && X86_LOCAL_APIC
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942
	---help---
943 944 945
	   Additional support for AMD specific MCE features such as
	   the DRAM Error Threshold.

946
config X86_ANCIENT_MCE
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947
	bool "Support for old Pentium 5 / WinChip machine checks"
948
	depends on X86_32 && X86_MCE
949 950 951 952
	---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.
953

954 955
config X86_MCE_THRESHOLD
	depends on X86_MCE_AMD || X86_MCE_INTEL
J
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956
	def_bool y
957

958
config X86_MCE_INJECT
959
	depends on X86_MCE
960 961 962 963 964 965
	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.

966 967
config X86_THERMAL_VECTOR
	def_bool y
968
	depends on X86_MCE_INTEL
969

970
config VM86
971
	bool "Enable VM86 support" if EXPERT
972 973
	default y
	depends on X86_32
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974 975
	---help---
	  This option is required by programs like DOSEMU to run 16-bit legacy
976
	  code on X86 processors. It also may be needed by software like
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977 978
	  XFree86 to initialize some video cards via BIOS. Disabling this
	  option saves about 6k.
979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997

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"
998
	select HWMON
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
	---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
1018 1019
	bool "Enable X86 board specific fixups for reboot"
	depends on X86_32
1020 1021 1022 1023 1024 1025 1026 1027
	---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
1028
	  CS5530A and CS5536 chipsets and the RDC R-321x SoC.
1029 1030 1031 1032 1033 1034

	  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
1035
	tristate "CPU microcode loading support"
1036 1037
	select FW_LOADER
	---help---
1038

1039
	  If you say Y here, you will be able to update the microcode on
1040
	  certain Intel and AMD processors. The Intel support is for the
1041 1042 1043 1044
	  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.
1045

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1046 1047
	  This option selects the general module only, you need to select
	  at least one vendor specific module as well.
1048

1049 1050
	  To compile this driver as a module, choose M here: the module
	  will be called microcode.
1051

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1052
config MICROCODE_INTEL
1053
	bool "Intel microcode loading support"
I
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1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
	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/>.
P
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1064

1065
config MICROCODE_AMD
1066
	bool "AMD microcode loading support"
I
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1067 1068 1069 1070 1071
	depends on MICROCODE
	select FW_LOADER
	---help---
	  If you select this option, microcode patch loading support for AMD
	  processors will be enabled.
1072

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1073
config MICROCODE_OLD_INTERFACE
1074
	def_bool y
1075 1076
	depends on MICROCODE

1077 1078 1079 1080 1081
config MICROCODE_INTEL_LIB
	def_bool y
	depends on MICROCODE_INTEL

config MICROCODE_INTEL_EARLY
1082 1083 1084 1085 1086 1087
	def_bool n

config MICROCODE_AMD_EARLY
	def_bool n

config MICROCODE_EARLY
1088
	bool "Early load microcode"
1089
	depends on MICROCODE=y && BLK_DEV_INITRD
1090 1091
	select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
	select MICROCODE_AMD_EARLY if MICROCODE_AMD
1092 1093 1094 1095 1096 1097 1098
	default y
	help
	  This option provides functionality to read additional microcode data
	  at the beginning of initrd image. The data tells kernel to load
	  microcode to CPU's as early as possible. No functional change if no
	  microcode data is glued to the initrd, therefore it's safe to say Y.

1099 1100
config X86_MSR
	tristate "/dev/cpu/*/msr - Model-specific register support"
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	---help---
1102 1103 1104 1105 1106 1107 1108 1109
	  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---
1111 1112 1113 1114 1115 1116 1117 1118
	  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
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 1155 1156 1157 1158 1159 1160 1161
	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---
1163 1164 1165 1166 1167
	  Select this if you have a 32-bit processor and between 1 and 4
	  gigabytes of physical RAM.

config HIGHMEM64G
	bool "64GB"
1168
	depends on !M486
1169
	select X86_PAE
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	---help---
1171 1172 1173 1174 1175 1176
	  Select this if you have a 32-bit processor and more than 4
	  gigabytes of physical RAM.

endchoice

choice
1177
	prompt "Memory split" if EXPERT
1178 1179
	default VMSPLIT_3G
	depends on X86_32
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	---help---
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
	  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
1220
	def_bool y
1221 1222 1223
	depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)

config X86_PAE
1224
	bool "PAE (Physical Address Extension) Support"
1225
	depends on X86_32 && !HIGHMEM4G
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	---help---
1227 1228 1229 1230 1231
	  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.

1232
config ARCH_PHYS_ADDR_T_64BIT
1233 1234
	def_bool y
	depends on X86_64 || X86_PAE
1235

1236
config ARCH_DMA_ADDR_T_64BIT
1237 1238
	def_bool y
	depends on X86_64 || HIGHMEM64G
1239

1240
config DIRECT_GBPAGES
1241
	bool "Enable 1GB pages for kernel pagetables" if EXPERT
1242 1243
	default y
	depends on X86_64
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	---help---
1245 1246 1247 1248
	  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".

1249 1250
# Common NUMA Features
config NUMA
1251
	bool "Numa Memory Allocation and Scheduler Support"
1252
	depends on SMP
1253
	depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
1254
	default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
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	---help---
1256
	  Enable NUMA (Non Uniform Memory Access) support.
1257

1258 1259 1260 1261
	  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.

1262
	  For 64-bit this is recommended if the system is Intel Core i7
1263 1264 1265 1266 1267 1268 1269
	  (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.
1270 1271 1272 1273

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

1274
config AMD_NUMA
1275 1276
	def_bool y
	prompt "Old style AMD Opteron NUMA detection"
1277
	depends on X86_64 && NUMA && PCI
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	---help---
1279 1280 1281 1282 1283
	  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.
1284 1285

config X86_64_ACPI_NUMA
1286 1287
	def_bool y
	prompt "ACPI NUMA detection"
1288 1289
	depends on X86_64 && NUMA && ACPI && PCI
	select ACPI_NUMA
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	---help---
1291 1292
	  Enable ACPI SRAT based node topology detection.

1293 1294 1295 1296 1297 1298 1299 1300 1301
# 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

1302 1303
config NUMA_EMU
	bool "NUMA emulation"
1304
	depends on NUMA
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	---help---
1306 1307 1308 1309 1310
	  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
1311
	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
1312 1313
	range 1 10
	default "10" if MAXSMP
1314 1315 1316 1317
	default "6" if X86_64
	default "4" if X86_NUMAQ
	default "3"
	depends on NEED_MULTIPLE_NODES
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	---help---
1319
	  Specify the maximum number of NUMA Nodes available on the target
1320
	  system.  Increases memory reserved to accommodate various tables.
1321 1322

config ARCH_HAVE_MEMORY_PRESENT
1323
	def_bool y
1324 1325 1326
	depends on X86_32 && DISCONTIGMEM

config NEED_NODE_MEMMAP_SIZE
1327
	def_bool y
1328 1329 1330 1331
	depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)

config ARCH_FLATMEM_ENABLE
	def_bool y
1332
	depends on X86_32 && !NUMA
1333 1334 1335

config ARCH_DISCONTIGMEM_ENABLE
	def_bool y
1336
	depends on NUMA && X86_32
1337 1338 1339

config ARCH_DISCONTIGMEM_DEFAULT
	def_bool y
1340 1341
	depends on NUMA && X86_32

1342 1343
config ARCH_SPARSEMEM_ENABLE
	def_bool y
1344
	depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
1345 1346 1347
	select SPARSEMEM_STATIC if X86_32
	select SPARSEMEM_VMEMMAP_ENABLE if X86_64

1348 1349 1350 1351
config ARCH_SPARSEMEM_DEFAULT
	def_bool y
	depends on X86_64

1352 1353
config ARCH_SELECT_MEMORY_MODEL
	def_bool y
1354
	depends on ARCH_SPARSEMEM_ENABLE
1355 1356

config ARCH_MEMORY_PROBE
1357
	bool "Enable sysfs memory/probe interface"
1358
	depends on X86_64 && MEMORY_HOTPLUG
1359 1360 1361 1362
	help
	  This option enables a sysfs memory/probe interface for testing.
	  See Documentation/memory-hotplug.txt for more information.
	  If you are unsure how to answer this question, answer N.
1363

1364 1365 1366 1367
config ARCH_PROC_KCORE_TEXT
	def_bool y
	depends on X86_64 && PROC_KCORE

1368 1369 1370 1371 1372
config ILLEGAL_POINTER_VALUE
       hex
       default 0 if X86_32
       default 0xdead000000000000 if X86_64

1373 1374 1375 1376
source "mm/Kconfig"

config HIGHPTE
	bool "Allocate 3rd-level pagetables from highmem"
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	depends on HIGHMEM
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	---help---
1379 1380 1381 1382 1383
	  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.

1384
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.
1405

1406
config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
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	bool "Set the default setting of memory_corruption_check"
1408 1409
	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.
1413

1414
config X86_RESERVE_LOW
1415 1416 1417
	int "Amount of low memory, in kilobytes, to reserve for the BIOS"
	default 64
	range 4 640
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	---help---
1419 1420 1421 1422 1423 1424 1425 1426 1427
	  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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1429 1430 1431 1432 1433
	  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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1435 1436 1437 1438 1439
	  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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1441
	  Leave this to the default value of 64 if you are unsure.
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1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
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
1471
	prompt "MTRR (Memory Type Range Register) support" if EXPERT
1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
	---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.

1502
	  See <file:Documentation/x86/mtrr.txt> for more information.
1503

1504
config MTRR_SANITIZER
1505
	def_bool y
1506 1507
	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.
1511

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	  Can be disabled with disable_mtrr_cleanup on the kernel command line.
1513
	  The largest mtrr entry size for a continuous block can be set with
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	  mtrr_chunk_size.
1515

1516
	  If unsure, say Y.
1517 1518

config MTRR_SANITIZER_ENABLE_DEFAULT
1519 1520 1521
	int "MTRR cleanup enable value (0-1)"
	range 0 1
	default "0"
1522
	depends on MTRR_SANITIZER
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	---help---
1524
	  Enable mtrr cleanup default value
1525

1526 1527 1528 1529 1530
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---
1532
	  mtrr cleanup spare entries default, it can be changed via
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	  mtrr_spare_reg_nr=N on the kernel command line.
1534

1535
config X86_PAT
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	def_bool y
1537
	prompt "x86 PAT support" if EXPERT
1538
	depends on MTRR
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	---help---
1540
	  Use PAT attributes to setup page level cache control.
1541

1542 1543 1544 1545
	  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,
1546
	  spontaneous reboots) or a non-working video driver.
1547 1548 1549

	  If unsure, say Y.

1550 1551 1552 1553
config ARCH_USES_PG_UNCACHED
	def_bool y
	depends on X86_PAT

1554 1555 1556 1557 1558 1559 1560 1561 1562
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.

1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573
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.

1574
config EFI
1575
	bool "EFI runtime service support"
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	depends on ACPI
1577
	select UCS2_STRING
1578
	---help---
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	  This enables the kernel to use EFI runtime services that are
	  available (such as the EFI variable services).
1581

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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.
1588

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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.

1596 1597
	  See Documentation/x86/efi-stub.txt for more information.

1598
config SECCOMP
1599 1600
	def_bool y
	prompt "Enable seccomp to safely compute untrusted bytecode"
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	---help---
1602 1603 1604 1605 1606 1607
	  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
1608
	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1609 1610 1611 1612 1613 1614
	  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
1615
	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
1620 1621 1622 1623 1624 1625 1626
	  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)
1629 1630 1631 1632 1633

source kernel/Kconfig.hz

config KEXEC
	bool "kexec system call"
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	---help---
1635 1636 1637 1638 1639 1640 1641 1642 1643
	  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
1644 1645 1646
	  initially work for you.  As of this writing the exact hardware
	  interface is strongly in flux, so no good recommendation can be
	  made.
1647 1648

config CRASH_DUMP
1649
	bool "kernel crash dumps"
1650
	depends on X86_64 || (X86_32 && HIGHMEM)
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	---help---
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
	  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
1663
	bool "kexec jump"
1664
	depends on KEXEC && HIBERNATION
I
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1665
	---help---
1666 1667
	  Jump between original kernel and kexeced kernel and invoke
	  code in physical address mode via KEXEC
H
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1668

1669
config PHYSICAL_START
1670
	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
1671
	default "0x1000000"
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1672
	---help---
1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
	  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.

1690 1691 1692 1693 1694 1695 1696 1697 1698
	  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.
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710

	  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
1711 1712
	bool "Build a relocatable kernel"
	default y
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	---help---
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
	  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.

1727 1728 1729 1730 1731
# Relocation on x86-32 needs some additional build support
config X86_NEED_RELOCS
	def_bool y
	depends on X86_32 && RELOCATABLE

1732
config PHYSICAL_ALIGN
1733
	hex "Alignment value to which kernel should be aligned"
1734
	default "0x1000000"
1735 1736
	range 0x2000 0x1000000 if X86_32
	range 0x200000 0x1000000 if X86_64
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	---help---
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
	  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.

1754 1755 1756
	  On 32-bit this value must be a multiple of 0x2000. On 64-bit
	  this value must be a multiple of 0x200000.

1757 1758 1759
	  Don't change this unless you know what you are doing.

config HOTPLUG_CPU
1760
	bool "Support for hot-pluggable CPUs"
1761
	depends on SMP
1762
	---help---
1763 1764 1765 1766 1767
	  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.
1768

1769 1770 1771
config BOOTPARAM_HOTPLUG_CPU0
	bool "Set default setting of cpu0_hotpluggable"
	default n
1772
	depends on HOTPLUG_CPU
1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
	---help---
	  Set whether default state of cpu0_hotpluggable is on or off.

	  Say Y here to enable CPU0 hotplug by default. If this switch
	  is turned on, there is no need to give cpu0_hotplug kernel
	  parameter and the CPU0 hotplug feature is enabled by default.

	  Please note: there are two known CPU0 dependencies if you want
	  to enable the CPU0 hotplug feature either by this switch or by
	  cpu0_hotplug kernel parameter.

	  First, resume from hibernate or suspend always starts from CPU0.
	  So hibernate and suspend are prevented if CPU0 is offline.

	  Second dependency is PIC interrupts always go to CPU0. CPU0 can not
	  offline if any interrupt can not migrate out of CPU0. There may
	  be other CPU0 dependencies.

	  Please make sure the dependencies are under your control before
	  you enable this feature.

	  Say N if you don't want to enable CPU0 hotplug feature by default.
	  You still can enable the CPU0 hotplug feature at boot by kernel
	  parameter cpu0_hotplug.

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config DEBUG_HOTPLUG_CPU0
	def_bool n
	prompt "Debug CPU0 hotplug"
1801
	depends on HOTPLUG_CPU
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	---help---
	  Enabling this option offlines CPU0 (if CPU0 can be offlined) as
	  soon as possible and boots up userspace with CPU0 offlined. User
	  can online CPU0 back after boot time.

	  To debug CPU0 hotplug, you need to enable CPU0 offline/online
	  feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
	  compilation or giving cpu0_hotplug kernel parameter at boot.

	  If unsure, say N.

1813
config COMPAT_VDSO
1814 1815
	def_bool y
	prompt "Compat VDSO support"
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1816
	depends on X86_32 || IA32_EMULATION
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1817
	---help---
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	  Map the 32-bit VDSO to the predictable old-style address too.
R
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1820 1821 1822 1823 1824 1825
	  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.

1826 1827
config CMDLINE_BOOL
	bool "Built-in kernel command line"
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	---help---
1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845
	  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---
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861
	  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---
1863 1864 1865 1866 1867 1868
	  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.

1869 1870 1871 1872 1873 1874
endmenu

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

1875 1876 1877 1878
config ARCH_ENABLE_MEMORY_HOTREMOVE
	def_bool y
	depends on MEMORY_HOTPLUG

1879
config USE_PERCPU_NUMA_NODE_ID
1880
	def_bool y
1881 1882
	depends on NUMA

1883
menu "Power management and ACPI options"
1884 1885

config ARCH_HIBERNATION_HEADER
1886
	def_bool y
1887 1888 1889 1890 1891 1892
	depends on X86_64 && HIBERNATION

source "kernel/power/Kconfig"

source "drivers/acpi/Kconfig"

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1893 1894
source "drivers/sfi/Kconfig"

1895
config X86_APM_BOOT
J
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1896
	def_bool y
1897
	depends on APM
1898

1899 1900
menuconfig APM
	tristate "APM (Advanced Power Management) BIOS support"
1901
	depends on X86_32 && PM_SLEEP
1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916
	---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
1917 1918
	  and more information, read <file:Documentation/power/apm-acpi.txt>
	  and the Battery Powered Linux mini-HOWTO, available from
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
	  <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---
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984
	  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
1985
	depends on CPU_IDLE
1986
	bool "Make CPU Idle calls when idle"
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	---help---
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997
	  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---
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
	  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---
2012 2013 2014 2015 2016 2017 2018 2019 2020
	  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

2021
source "drivers/cpufreq/Kconfig"
2022 2023 2024

source "drivers/cpuidle/Kconfig"

A
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2025 2026
source "drivers/idle/Kconfig"

2027 2028 2029 2030 2031 2032
endmenu


menu "Bus options (PCI etc.)"

config PCI
I
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2033
	bool "PCI support"
A
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2034
	default y
2035
	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
I
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2036
	---help---
2037 2038 2039 2040 2041 2042 2043
	  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"
2044
	depends on X86_32 && PCI
2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069
	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"

2070
config PCI_GOOLPC
2071
	bool "OLPC XO-1"
2072 2073
	depends on OLPC

2074 2075 2076
config PCI_GOANY
	bool "Any"

2077 2078 2079
endchoice

config PCI_BIOS
2080
	def_bool y
2081
	depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
2082 2083 2084

# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
config PCI_DIRECT
2085
	def_bool y
2086
	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
2087 2088

config PCI_MMCONFIG
2089
	def_bool y
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2090
	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
2091

2092
config PCI_OLPC
2093 2094
	def_bool y
	depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
2095

2096 2097 2098 2099 2100
config PCI_XEN
	def_bool y
	depends on PCI && XEN
	select SWIOTLB_XEN

2101
config PCI_DOMAINS
2102
	def_bool y
2103 2104 2105 2106 2107 2108
	depends on PCI

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

2109
config PCI_CNB20LE_QUIRK
2110
	bool "Read CNB20LE Host Bridge Windows" if EXPERT
2111
	depends on PCI
2112 2113 2114 2115 2116
	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.

2117 2118 2119 2120 2121
	  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.

2122 2123 2124 2125
source "drivers/pci/pcie/Kconfig"

source "drivers/pci/Kconfig"

2126
# x86_64 have no ISA slots, but can have ISA-style DMA.
2127
config ISA_DMA_API
2128 2129 2130 2131 2132
	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.
2133 2134 2135 2136 2137

if X86_32

config ISA
	bool "ISA support"
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2138
	---help---
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
	  Find out whether you have ISA slots on your motherboard.  ISA is the
	  name of a bus system, i.e. the way the CPU talks to the other stuff
	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
	  newer boards don't support it.  If you have ISA, say Y, otherwise N.

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

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

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

	  Otherwise, say N.

source "drivers/eisa/Kconfig"

config SCx200
	tristate "NatSemi SCx200 support"
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2165
	---help---
2166 2167 2168 2169 2170 2171 2172 2173 2174
	  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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2175
	depends on SCx200
2176
	default y
I
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2177
	---help---
2178 2179 2180 2181 2182 2183
	  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.

2184 2185
config OLPC
	bool "One Laptop Per Child support"
2186
	depends on !X86_PAE
2187
	select GPIOLIB
2188
	select OF
2189
	select OF_PROMTREE
2190
	select IRQ_DOMAIN
I
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2191
	---help---
2192 2193 2194
	  Add support for detecting the unique features of the OLPC
	  XO hardware.

2195 2196
config OLPC_XO1_PM
	bool "OLPC XO-1 Power Management"
2197
	depends on OLPC && MFD_CS5535 && PM_SLEEP
2198
	select MFD_CORE
2199
	---help---
2200
	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
2201

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2202 2203 2204 2205 2206 2207 2208
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.

2209 2210
config OLPC_XO1_SCI
	bool "OLPC XO-1 SCI extras"
2211
	depends on OLPC && OLPC_XO1_PM
2212
	depends on INPUT=y
2213
	select POWER_SUPPLY
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	select GPIO_CS5535
	select MFD_CORE
	---help---
	  Add support for SCI-based features of the OLPC XO-1 laptop:
2218
	   - EC-driven system wakeups
2219
	   - Power button
2220
	   - Ebook switch
2221
	   - Lid switch
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	   - AC adapter status updates
	   - Battery status updates
2224

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config OLPC_XO15_SCI
	bool "OLPC XO-1.5 SCI extras"
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	depends on OLPC && ACPI
	select POWER_SUPPLY
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	---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
2234

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config ALIX
	bool "PCEngines ALIX System Support (LED setup)"
	select GPIOLIB
	---help---
	  This option enables system support for the PCEngines ALIX.
	  At present this just sets up LEDs for GPIO control on
	  ALIX2/3/6 boards.  However, other system specific setup should
	  get added here.

	  Note: You must still enable the drivers for GPIO and LED support
	  (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs

	  Note: You have to set alix.force=1 for boards with Award BIOS.

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

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

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

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endif # X86_32

2273
config AMD_NB
2274
	def_bool y
2275
	depends on CPU_SUP_AMD && PCI
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source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

2281
config RAPIDIO
2282
	tristate "RapidIO support"
2283 2284 2285
	depends on PCI
	default n
	help
2286
	  If enabled this option will include drivers and the core
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	  infrastructure code to support RapidIO interconnect devices.

source "drivers/rapidio/Kconfig"

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config X86_SYSFB
	bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
	help
	  Firmwares often provide initial graphics framebuffers so the BIOS,
	  bootloader or kernel can show basic video-output during boot for
	  user-guidance and debugging. Historically, x86 used the VESA BIOS
	  Extensions and EFI-framebuffers for this, which are mostly limited
	  to x86.
	  This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
	  framebuffers so the new generic system-framebuffer drivers can be
	  used on x86. If the framebuffer is not compatible with the generic
	  modes, it is adverticed as fallback platform framebuffer so legacy
	  drivers like efifb, vesafb and uvesafb can pick it up.
	  If this option is not selected, all system framebuffers are always
	  marked as fallback platform framebuffers as usual.

	  Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
	  not be able to pick up generic system framebuffers if this option
	  is selected. You are highly encouraged to enable simplefb as
	  replacement if you select this option. simplefb can correctly deal
	  with generic system framebuffers. But you should still keep vesafb
	  and others enabled as fallback if a system framebuffer is
	  incompatible with simplefb.

	  If unsure, say Y.

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endmenu


menu "Executable file formats / Emulations"

source "fs/Kconfig.binfmt"

config IA32_EMULATION
	bool "IA32 Emulation"
	depends on X86_64
2327
	select BINFMT_ELF
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	select COMPAT_BINFMT_ELF
2329
	select HAVE_UID16
I
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	---help---
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	  Include code to run legacy 32-bit programs under a
	  64-bit kernel. You should likely turn this on, unless you're
	  100% sure that you don't have any 32-bit programs left.
2334 2335

config IA32_AOUT
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	tristate "IA32 a.out support"
	depends on IA32_EMULATION
	---help---
	  Support old a.out binaries in the 32bit emulation.
2340

2341
config X86_X32
2342 2343
	bool "x32 ABI for 64-bit mode"
	depends on X86_64 && IA32_EMULATION
H
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	---help---
	  Include code to run binaries for the x32 native 32-bit ABI
	  for 64-bit processors.  An x32 process gets access to the
	  full 64-bit register file and wide data path while leaving
	  pointers at 32 bits for smaller memory footprint.

	  You will need a recent binutils (2.22 or later) with
	  elf32_x86_64 support enabled to compile a kernel with this
	  option set.

2354
config COMPAT
2355
	def_bool y
2356
	depends on IA32_EMULATION || X86_X32
2357
	select ARCH_WANT_OLD_COMPAT_IPC
2358

2359
if COMPAT
2360
config COMPAT_FOR_U64_ALIGNMENT
2361
	def_bool y
2362 2363

config SYSVIPC_COMPAT
2364
	def_bool y
2365
	depends on SYSVIPC
2366

2367
config KEYS_COMPAT
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	def_bool y
	depends on KEYS
endif
2371

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endmenu


K
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config HAVE_ATOMIC_IOMAP
	def_bool y
	depends on X86_32

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config X86_DEV_DMA_OPS
	bool
2381
	depends on X86_64 || STA2X11
2382

2383 2384
config X86_DMA_REMAP
	bool
2385
	depends on STA2X11
2386

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source "net/Kconfig"

source "drivers/Kconfig"

source "drivers/firmware/Kconfig"

source "fs/Kconfig"

source "arch/x86/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

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source "arch/x86/kvm/Kconfig"

2403
source "lib/Kconfig"