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Merge tag 'for-linus' of git://linux-c6x.org/git/projects/linux-c6x-upstreaming
Pull Kconfig cleanups from Mark Salter:
"Remove some unused config options from C6X and clean up PC_PARPORT
dependencies. The latter was discussed here:
https://lkml.org/lkml/2013/10/8/12"
* tag 'for-linus' of git://linux-c6x.org/git/projects/linux-c6x-upstreaming:
c6x: remove unused COMMON_CLKDEV Kconfig parameter
Kconfig cleanup (PARPORT_PC dependencies)
x86: select ARCH_MIGHT_HAVE_PC_PARPORT
unicore32: select ARCH_MIGHT_HAVE_PC_PARPORT
sparc: select ARCH_MIGHT_HAVE_PC_PARPORT
sh: select ARCH_MIGHT_HAVE_PC_PARPORT
powerpc: select ARCH_MIGHT_HAVE_PC_PARPORT
parisc: select ARCH_MIGHT_HAVE_PC_PARPORT
mips: select ARCH_MIGHT_HAVE_PC_PARPORT
microblaze: select ARCH_MIGHT_HAVE_PC_PARPORT
m68k: select ARCH_MIGHT_HAVE_PC_PARPORT
ia64: select ARCH_MIGHT_HAVE_PC_PARPORT
arm: select ARCH_MIGHT_HAVE_PC_PARPORT
alpha: select ARCH_MIGHT_HAVE_PC_PARPORT
c6x: remove unused parameter in Kconfig
2412 lines
77 KiB
Plaintext
2412 lines
77 KiB
Plaintext
# Select 32 or 64 bit
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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
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Say no to build a 32-bit kernel - formerly known as i386
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config X86_32
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def_bool y
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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
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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 ARCH_MIGHT_HAVE_PC_PARPORT
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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
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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
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select HAVE_KERNEL_BZIP2
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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
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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 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
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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 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
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select GENERIC_CLOCKEVENTS
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select ARCH_CLOCKSOURCE_DATA if X86_64
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select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
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select GENERIC_TIME_VSYSCALL if X86_64
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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
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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
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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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select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
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config INSTRUCTION_DECODER
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def_bool y
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depends on KPROBES || PERF_EVENTS || UPROBES
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config OUTPUT_FORMAT
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string
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default "elf32-i386" if X86_32
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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
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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
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def_bool y
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config MMU
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def_bool y
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config SBUS
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bool
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config NEED_DMA_MAP_STATE
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def_bool y
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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
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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
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config GENERIC_BUG_RELATIVE_POINTERS
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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
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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
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def_bool y
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config ARCH_HAS_CPU_RELAX
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def_bool y
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config ARCH_HAS_CACHE_LINE_SIZE
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def_bool y
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config ARCH_HAS_CPU_AUTOPROBE
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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
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def_bool y
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config NEED_PER_CPU_PAGE_FIRST_CHUNK
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def_bool y
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config ARCH_HIBERNATION_POSSIBLE
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def_bool y
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config ARCH_SUSPEND_POSSIBLE
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def_bool y
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config ARCH_WANT_HUGE_PMD_SHARE
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def_bool y
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config ARCH_WANT_GENERAL_HUGETLB
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def_bool y
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config ZONE_DMA32
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bool
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default X86_64
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config AUDIT_ARCH
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bool
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default X86_64
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config ARCH_SUPPORTS_OPTIMIZED_INLINING
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def_bool y
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config ARCH_SUPPORTS_DEBUG_PAGEALLOC
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def_bool y
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config HAVE_INTEL_TXT
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def_bool y
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depends on INTEL_IOMMU && ACPI
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config X86_32_SMP
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def_bool y
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depends on X86_32 && SMP
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config X86_64_SMP
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def_bool y
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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
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def_bool y
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depends on X86_32 && !CC_STACKPROTECTOR
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config ARCH_HWEIGHT_CFLAGS
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string
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default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
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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_SUPPORTS_UPROBES
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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
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bool "DMA memory allocation support" if EXPERT
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default y
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help
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DMA memory allocation support allows devices with less than 32-bit
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addressing to allocate within the first 16MB of address space.
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Disable if no such devices will be used.
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If unsure, say Y.
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config SMP
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bool "Symmetric multi-processing support"
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on many, but not all,
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singleprocessor machines. On a singleprocessor machine, the kernel
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will run faster if you say N here.
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Note that if you say Y here and choose architecture "586" or
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"Pentium" under "Processor family", the kernel will not work on 486
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architectures. Similarly, multiprocessor kernels for the "PPro"
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architecture may not work on all Pentium based boards.
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People using multiprocessor machines who say Y here should also say
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Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
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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
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<http://www.tldp.org/docs.html#howto>.
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If you don't know what to do here, say N.
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config X86_X2APIC
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bool "Support x2apic"
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depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
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---help---
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This enables x2apic support on CPUs that have this feature.
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This allows 32-bit apic IDs (so it can support very large systems),
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and accesses the local apic via MSRs not via mmio.
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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
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(esp with 64bit cpus) with acpi support, MADT and DSDT will override it
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config X86_BIGSMP
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bool "Support for big SMP systems with more than 8 CPUs"
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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
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def_bool y
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depends on X86_GOLDFISH
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if X86_32
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config X86_EXTENDED_PLATFORM
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bool "Support for extended (non-PC) x86 platforms"
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default y
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---help---
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If you disable this option then the kernel will only support
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standard PC platforms. (which covers the vast majority of
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systems out there.)
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If you enable this option then you'll be able to select support
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for the following (non-PC) 32 bit x86 platforms:
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Goldfish (Android emulator)
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AMD Elan
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NUMAQ (IBM/Sequent)
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RDC R-321x SoC
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SGI 320/540 (Visual Workstation)
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STA2X11-based (e.g. Northville)
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Summit/EXA (IBM x440)
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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
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generic distribution kernel, say Y here - otherwise say N.
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endif
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if X86_64
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config X86_EXTENDED_PLATFORM
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bool "Support for extended (non-PC) x86 platforms"
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default y
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---help---
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If you disable this option then the kernel will only support
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standard PC platforms. (which covers the vast majority of
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systems out there.)
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If you enable this option then you'll be able to select support
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for the following (non-PC) 64 bit x86 platforms:
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Numascale NumaChip
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ScaleMP vSMP
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SGI Ultraviolet
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If you have one of these systems, or if you want to build a
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generic distribution kernel, say Y here - otherwise say N.
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endif
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# This is an alphabetically sorted list of 64 bit extended platforms
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# Please maintain the alphabetic order if and when there are additions
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config X86_NUMACHIP
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bool "Numascale NumaChip"
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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 SMP
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depends on X86_X2APIC
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depends on PCI_MMCONFIG
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---help---
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Adds support for Numascale NumaChip large-SMP systems. Needed to
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enable more than ~168 cores.
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If you don't have one of these, you should say N here.
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config X86_VSMP
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bool "ScaleMP vSMP"
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select HYPERVISOR_GUEST
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select PARAVIRT
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depends on X86_64 && PCI
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depends on X86_EXTENDED_PLATFORM
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depends on SMP
|
|
---help---
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Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
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supposed to run on these EM64T-based machines. Only choose this option
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if you have one of these machines.
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|
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config X86_UV
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bool "SGI Ultraviolet"
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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.
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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
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# Please maintain the alphabetic order if and when there are additions
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|
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config X86_GOLDFISH
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bool "Goldfish (Virtual Platform)"
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depends on X86_32
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depends on X86_EXTENDED_PLATFORM
|
|
---help---
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|
Enable support for the Goldfish virtual platform used primarily
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for Android development. Unless you are building for the Android
|
|
Goldfish emulator say N here.
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|
|
config X86_INTEL_CE
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|
bool "CE4100 TV platform"
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depends on PCI
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depends on PCI_GODIRECT
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|
depends on X86_32
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|
depends on X86_EXTENDED_PLATFORM
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select X86_REBOOTFIXUPS
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select OF
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|
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.
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|
This option compiles in support for the CE4100 SOC for settop
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|
boxes and media devices.
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|
|
config X86_WANT_INTEL_MID
|
|
bool "Intel MID platform support"
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|
depends on X86_32
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|
depends on X86_EXTENDED_PLATFORM
|
|
---help---
|
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Select to build a kernel capable of supporting Intel MID platform
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systems which do not have the PCI legacy interfaces (Moorestown,
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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
|
|
|
|
config X86_MDFLD
|
|
bool "Medfield MID platform"
|
|
depends on PCI
|
|
depends on PCI_GOANY
|
|
depends on X86_IO_APIC
|
|
select X86_INTEL_MID
|
|
select SFI
|
|
select DW_APB_TIMER
|
|
select APB_TIMER
|
|
select I2C
|
|
select SPI
|
|
select INTEL_SCU_IPC
|
|
select X86_PLATFORM_DEVICES
|
|
select MFD_INTEL_MSIC
|
|
---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.
|
|
|
|
endif
|
|
|
|
config X86_INTEL_LPSS
|
|
bool "Intel Low Power Subsystem Support"
|
|
depends on ACPI
|
|
select COMMON_CLK
|
|
select PINCTRL
|
|
---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) and pincontrol
|
|
which are needed by the LPSS peripheral drivers.
|
|
|
|
config X86_RDC321X
|
|
bool "RDC R-321x SoC"
|
|
depends on X86_32
|
|
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.
|
|
|
|
config X86_32_NON_STANDARD
|
|
bool "Support non-standard 32-bit SMP architectures"
|
|
depends on X86_32 && SMP
|
|
depends on X86_EXTENDED_PLATFORM
|
|
---help---
|
|
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.
|
|
|
|
# Alphabetically sorted list of Non standard 32 bit platforms
|
|
|
|
config X86_NUMAQ
|
|
bool "NUMAQ (IBM/Sequent)"
|
|
depends on X86_32_NON_STANDARD
|
|
depends on PCI
|
|
select NUMA
|
|
select X86_MPPARSE
|
|
---help---
|
|
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>.
|
|
|
|
config X86_SUPPORTS_MEMORY_FAILURE
|
|
def_bool y
|
|
# 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
|
|
|
|
config X86_VISWS
|
|
bool "SGI 320/540 (Visual Workstation)"
|
|
depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
|
|
depends on X86_32_NON_STANDARD
|
|
---help---
|
|
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.
|
|
|
|
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.
|
|
|
|
config X86_SUMMIT
|
|
bool "Summit/EXA (IBM x440)"
|
|
depends on X86_32_NON_STANDARD
|
|
---help---
|
|
This option is needed for IBM systems that use the Summit/EXA chipset.
|
|
In particular, it is needed for the x440.
|
|
|
|
config X86_ES7000
|
|
bool "Unisys ES7000 IA32 series"
|
|
depends on X86_32_NON_STANDARD && X86_BIGSMP
|
|
---help---
|
|
Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
|
|
supposed to run on an IA32-based Unisys ES7000 system.
|
|
|
|
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.
|
|
|
|
config SCHED_OMIT_FRAME_POINTER
|
|
def_bool y
|
|
prompt "Single-depth WCHAN output"
|
|
depends on X86
|
|
---help---
|
|
Calculate simpler /proc/<PID>/wchan values. If this option
|
|
is disabled then wchan values will recurse back to the
|
|
caller function. This provides more accurate wchan values,
|
|
at the expense of slightly more scheduling overhead.
|
|
|
|
If in doubt, say "Y".
|
|
|
|
menuconfig HYPERVISOR_GUEST
|
|
bool "Linux guest support"
|
|
---help---
|
|
Say Y here to enable options for running Linux under various hyper-
|
|
visors. This option enables basic hypervisor detection and platform
|
|
setup.
|
|
|
|
If you say N, all options in this submenu will be skipped and
|
|
disabled, and Linux guest support won't be built in.
|
|
|
|
if HYPERVISOR_GUEST
|
|
|
|
config PARAVIRT
|
|
bool "Enable paravirtualization code"
|
|
---help---
|
|
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.
|
|
|
|
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.
|
|
|
|
config PARAVIRT_SPINLOCKS
|
|
bool "Paravirtualization layer for spinlocks"
|
|
depends on PARAVIRT && SMP
|
|
select UNINLINE_SPIN_UNLOCK
|
|
---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).
|
|
|
|
It has a minimal impact on native kernels and gives a nice performance
|
|
benefit on paravirtualized KVM / Xen kernels.
|
|
|
|
If you are unsure how to answer this question, answer Y.
|
|
|
|
source "arch/x86/xen/Kconfig"
|
|
|
|
config KVM_GUEST
|
|
bool "KVM Guest support (including kvmclock)"
|
|
depends on PARAVIRT
|
|
select PARAVIRT_CLOCK
|
|
default y
|
|
---help---
|
|
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
|
|
|
|
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.
|
|
|
|
source "arch/x86/lguest/Kconfig"
|
|
|
|
config PARAVIRT_TIME_ACCOUNTING
|
|
bool "Paravirtual steal time accounting"
|
|
depends on PARAVIRT
|
|
default n
|
|
---help---
|
|
Select this option to enable fine granularity task steal time
|
|
accounting. Time spent executing other tasks in parallel with
|
|
the current vCPU is discounted from the vCPU power. To account for
|
|
that, there can be a small performance impact.
|
|
|
|
If in doubt, say N here.
|
|
|
|
config PARAVIRT_CLOCK
|
|
bool
|
|
|
|
endif #HYPERVISOR_GUEST
|
|
|
|
config NO_BOOTMEM
|
|
def_bool y
|
|
|
|
config MEMTEST
|
|
bool "Memtest"
|
|
---help---
|
|
This option adds a kernel parameter 'memtest', which allows memtest
|
|
to be set.
|
|
memtest=0, mean disabled; -- default
|
|
memtest=1, mean do 1 test pattern;
|
|
...
|
|
memtest=4, mean do 4 test patterns.
|
|
If you are unsure how to answer this question, answer N.
|
|
|
|
config X86_SUMMIT_NUMA
|
|
def_bool y
|
|
depends on X86_32 && NUMA && X86_32_NON_STANDARD
|
|
|
|
config X86_CYCLONE_TIMER
|
|
def_bool y
|
|
depends on X86_SUMMIT
|
|
|
|
source "arch/x86/Kconfig.cpu"
|
|
|
|
config HPET_TIMER
|
|
def_bool X86_64
|
|
prompt "HPET Timer Support" if X86_32
|
|
---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>.
|
|
|
|
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.
|
|
|
|
Choose N to continue using the legacy 8254 timer.
|
|
|
|
config HPET_EMULATE_RTC
|
|
def_bool y
|
|
depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
|
|
|
|
config APB_TIMER
|
|
def_bool y if X86_INTEL_MID
|
|
prompt "Intel MID APB Timer Support" if X86_INTEL_MID
|
|
select DW_APB_TIMER
|
|
depends on X86_INTEL_MID && SFI
|
|
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.
|
|
|
|
# Mark as expert because too many people got it wrong.
|
|
# The code disables itself when not needed.
|
|
config DMI
|
|
default y
|
|
bool "Enable DMI scanning" if EXPERT
|
|
---help---
|
|
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.
|
|
|
|
config GART_IOMMU
|
|
bool "Old AMD GART IOMMU support"
|
|
select SWIOTLB
|
|
depends on X86_64 && PCI && AMD_NB
|
|
---help---
|
|
Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
|
|
GART based hardware IOMMUs.
|
|
|
|
The GART supports full DMA access for devices with 32-bit access
|
|
limitations, on systems with more than 3 GB. This is usually needed
|
|
for USB, sound, many IDE/SATA chipsets and some other devices.
|
|
|
|
Newer systems typically have a modern AMD IOMMU, supported via
|
|
the CONFIG_AMD_IOMMU=y config option.
|
|
|
|
In normal configurations this driver is only active when needed:
|
|
there's more than 3 GB of memory and the system contains a
|
|
32-bit limited device.
|
|
|
|
If unsure, say Y.
|
|
|
|
config CALGARY_IOMMU
|
|
bool "IBM Calgary IOMMU support"
|
|
select SWIOTLB
|
|
depends on X86_64 && PCI
|
|
---help---
|
|
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
|
|
def_bool y
|
|
prompt "Should Calgary be enabled by default?"
|
|
depends on CALGARY_IOMMU
|
|
---help---
|
|
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
|
|
def_bool y if X86_64
|
|
---help---
|
|
Support for software bounce buffers used on x86-64 systems
|
|
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.
|
|
|
|
config IOMMU_HELPER
|
|
def_bool y
|
|
depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
|
|
|
|
config MAXSMP
|
|
bool "Enable Maximum number of SMP Processors and NUMA Nodes"
|
|
depends on X86_64 && SMP && DEBUG_KERNEL
|
|
select CPUMASK_OFFSTACK
|
|
---help---
|
|
Enable maximum number of CPUS and NUMA Nodes for this architecture.
|
|
If unsure, say N.
|
|
|
|
config NR_CPUS
|
|
int "Maximum number of CPUs" if SMP && !MAXSMP
|
|
range 2 8 if SMP && X86_32 && !X86_BIGSMP
|
|
range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
|
|
range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
|
|
default "1" if !SMP
|
|
default "8192" if MAXSMP
|
|
default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
|
|
default "8" if SMP
|
|
---help---
|
|
This allows you to specify the maximum number of CPUs which this
|
|
kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
|
|
supported value is 4096, otherwise the maximum value is 512. The
|
|
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"
|
|
depends on X86_HT
|
|
---help---
|
|
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
|
|
def_bool y
|
|
prompt "Multi-core scheduler support"
|
|
depends on X86_HT
|
|
---help---
|
|
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"
|
|
depends on X86_32 && !SMP && !X86_32_NON_STANDARD && !PCI_MSI
|
|
---help---
|
|
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
|
|
---help---
|
|
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
|
|
def_bool y
|
|
depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
|
|
|
|
config X86_IO_APIC
|
|
def_bool y
|
|
depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC || PCI_MSI
|
|
|
|
config X86_VISWS_APIC
|
|
def_bool y
|
|
depends on X86_32 && X86_VISWS
|
|
|
|
config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
|
|
bool "Reroute for broken boot IRQs"
|
|
depends on X86_IO_APIC
|
|
---help---
|
|
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.
|
|
|
|
config X86_MCE
|
|
bool "Machine Check / overheating reporting"
|
|
default y
|
|
---help---
|
|
Machine Check support allows the processor to notify the
|
|
kernel if it detects a problem (e.g. overheating, data corruption).
|
|
The action the kernel takes depends on the severity of the problem,
|
|
ranging from warning messages to halting the machine.
|
|
|
|
config X86_MCE_INTEL
|
|
def_bool y
|
|
prompt "Intel MCE features"
|
|
depends on X86_MCE && X86_LOCAL_APIC
|
|
---help---
|
|
Additional support for intel specific MCE features such as
|
|
the thermal monitor.
|
|
|
|
config X86_MCE_AMD
|
|
def_bool y
|
|
prompt "AMD MCE features"
|
|
depends on X86_MCE && X86_LOCAL_APIC
|
|
---help---
|
|
Additional support for AMD specific MCE features such as
|
|
the DRAM Error Threshold.
|
|
|
|
config X86_ANCIENT_MCE
|
|
bool "Support for old Pentium 5 / WinChip machine checks"
|
|
depends on X86_32 && X86_MCE
|
|
---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.
|
|
|
|
config X86_MCE_THRESHOLD
|
|
depends on X86_MCE_AMD || X86_MCE_INTEL
|
|
def_bool y
|
|
|
|
config X86_MCE_INJECT
|
|
depends on X86_MCE
|
|
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.
|
|
|
|
config X86_THERMAL_VECTOR
|
|
def_bool y
|
|
depends on X86_MCE_INTEL
|
|
|
|
config VM86
|
|
bool "Enable VM86 support" if EXPERT
|
|
default y
|
|
depends on X86_32
|
|
---help---
|
|
This option is required by programs like DOSEMU to run 16-bit legacy
|
|
code on X86 processors. It also may be needed by software like
|
|
XFree86 to initialize some video cards via BIOS. Disabling this
|
|
option saves about 6k.
|
|
|
|
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"
|
|
select HWMON
|
|
---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
|
|
bool "Enable X86 board specific fixups for reboot"
|
|
depends on X86_32
|
|
---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
|
|
CS5530A and CS5536 chipsets and the RDC R-321x SoC.
|
|
|
|
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
|
|
tristate "CPU microcode loading support"
|
|
depends on CPU_SUP_AMD || CPU_SUP_INTEL
|
|
select FW_LOADER
|
|
---help---
|
|
|
|
If you say Y here, you will be able to update the microcode on
|
|
certain Intel and AMD processors. The Intel support is for the
|
|
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.
|
|
|
|
This option selects the general module only, you need to select
|
|
at least one vendor specific module as well.
|
|
|
|
To compile this driver as a module, choose M here: the module
|
|
will be called microcode.
|
|
|
|
config MICROCODE_INTEL
|
|
bool "Intel microcode loading support"
|
|
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/>.
|
|
|
|
config MICROCODE_AMD
|
|
bool "AMD microcode loading support"
|
|
depends on MICROCODE
|
|
select FW_LOADER
|
|
---help---
|
|
If you select this option, microcode patch loading support for AMD
|
|
processors will be enabled.
|
|
|
|
config MICROCODE_OLD_INTERFACE
|
|
def_bool y
|
|
depends on MICROCODE
|
|
|
|
config MICROCODE_INTEL_LIB
|
|
def_bool y
|
|
depends on MICROCODE_INTEL
|
|
|
|
config MICROCODE_INTEL_EARLY
|
|
def_bool n
|
|
|
|
config MICROCODE_AMD_EARLY
|
|
def_bool n
|
|
|
|
config MICROCODE_EARLY
|
|
bool "Early load microcode"
|
|
depends on MICROCODE=y && BLK_DEV_INITRD
|
|
select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
|
|
select MICROCODE_AMD_EARLY if MICROCODE_AMD
|
|
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.
|
|
|
|
config X86_MSR
|
|
tristate "/dev/cpu/*/msr - Model-specific register support"
|
|
---help---
|
|
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"
|
|
---help---
|
|
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
|
|
default HIGHMEM4G
|
|
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
|
|
---help---
|
|
Select this if you have a 32-bit processor and between 1 and 4
|
|
gigabytes of physical RAM.
|
|
|
|
config HIGHMEM64G
|
|
bool "64GB"
|
|
depends on !M486
|
|
select X86_PAE
|
|
---help---
|
|
Select this if you have a 32-bit processor and more than 4
|
|
gigabytes of physical RAM.
|
|
|
|
endchoice
|
|
|
|
choice
|
|
prompt "Memory split" if EXPERT
|
|
default VMSPLIT_3G
|
|
depends on X86_32
|
|
---help---
|
|
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
|
|
def_bool y
|
|
depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
|
|
|
|
config X86_PAE
|
|
bool "PAE (Physical Address Extension) Support"
|
|
depends on X86_32 && !HIGHMEM4G
|
|
---help---
|
|
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.
|
|
|
|
config ARCH_PHYS_ADDR_T_64BIT
|
|
def_bool y
|
|
depends on X86_64 || X86_PAE
|
|
|
|
config ARCH_DMA_ADDR_T_64BIT
|
|
def_bool y
|
|
depends on X86_64 || HIGHMEM64G
|
|
|
|
config DIRECT_GBPAGES
|
|
bool "Enable 1GB pages for kernel pagetables" if EXPERT
|
|
default y
|
|
depends on X86_64
|
|
---help---
|
|
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".
|
|
|
|
# Common NUMA Features
|
|
config NUMA
|
|
bool "Numa Memory Allocation and Scheduler Support"
|
|
depends on SMP
|
|
depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
|
|
default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
|
|
---help---
|
|
Enable NUMA (Non Uniform Memory Access) support.
|
|
|
|
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.
|
|
|
|
For 64-bit this is recommended if the system is Intel Core i7
|
|
(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.
|
|
|
|
comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
|
|
depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
|
|
|
|
config AMD_NUMA
|
|
def_bool y
|
|
prompt "Old style AMD Opteron NUMA detection"
|
|
depends on X86_64 && NUMA && PCI
|
|
---help---
|
|
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.
|
|
|
|
config X86_64_ACPI_NUMA
|
|
def_bool y
|
|
prompt "ACPI NUMA detection"
|
|
depends on X86_64 && NUMA && ACPI && PCI
|
|
select ACPI_NUMA
|
|
---help---
|
|
Enable ACPI SRAT based node topology detection.
|
|
|
|
# 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
|
|
|
|
config NUMA_EMU
|
|
bool "NUMA emulation"
|
|
depends on NUMA
|
|
---help---
|
|
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
|
|
int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
|
|
range 1 10
|
|
default "10" if MAXSMP
|
|
default "6" if X86_64
|
|
default "4" if X86_NUMAQ
|
|
default "3"
|
|
depends on NEED_MULTIPLE_NODES
|
|
---help---
|
|
Specify the maximum number of NUMA Nodes available on the target
|
|
system. Increases memory reserved to accommodate various tables.
|
|
|
|
config ARCH_HAVE_MEMORY_PRESENT
|
|
def_bool y
|
|
depends on X86_32 && DISCONTIGMEM
|
|
|
|
config NEED_NODE_MEMMAP_SIZE
|
|
def_bool y
|
|
depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
|
|
|
|
config ARCH_FLATMEM_ENABLE
|
|
def_bool y
|
|
depends on X86_32 && !NUMA
|
|
|
|
config ARCH_DISCONTIGMEM_ENABLE
|
|
def_bool y
|
|
depends on NUMA && X86_32
|
|
|
|
config ARCH_DISCONTIGMEM_DEFAULT
|
|
def_bool y
|
|
depends on NUMA && X86_32
|
|
|
|
config ARCH_SPARSEMEM_ENABLE
|
|
def_bool y
|
|
depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
|
|
select SPARSEMEM_STATIC if X86_32
|
|
select SPARSEMEM_VMEMMAP_ENABLE if X86_64
|
|
|
|
config ARCH_SPARSEMEM_DEFAULT
|
|
def_bool y
|
|
depends on X86_64
|
|
|
|
config ARCH_SELECT_MEMORY_MODEL
|
|
def_bool y
|
|
depends on ARCH_SPARSEMEM_ENABLE
|
|
|
|
config ARCH_MEMORY_PROBE
|
|
bool "Enable sysfs memory/probe interface"
|
|
depends on X86_64 && MEMORY_HOTPLUG
|
|
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.
|
|
|
|
config ARCH_PROC_KCORE_TEXT
|
|
def_bool y
|
|
depends on X86_64 && PROC_KCORE
|
|
|
|
config ILLEGAL_POINTER_VALUE
|
|
hex
|
|
default 0 if X86_32
|
|
default 0xdead000000000000 if X86_64
|
|
|
|
source "mm/Kconfig"
|
|
|
|
config HIGHPTE
|
|
bool "Allocate 3rd-level pagetables from highmem"
|
|
depends on HIGHMEM
|
|
---help---
|
|
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.
|
|
|
|
config X86_CHECK_BIOS_CORRUPTION
|
|
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.
|
|
|
|
config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
|
|
bool "Set the default setting of memory_corruption_check"
|
|
depends on X86_CHECK_BIOS_CORRUPTION
|
|
default y
|
|
---help---
|
|
Set whether the default state of memory_corruption_check is
|
|
on or off.
|
|
|
|
config X86_RESERVE_LOW
|
|
int "Amount of low memory, in kilobytes, to reserve for the BIOS"
|
|
default 64
|
|
range 4 640
|
|
---help---
|
|
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.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
Leave this to the default value of 64 if you are unsure.
|
|
|
|
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
|
|
def_bool y
|
|
prompt "MTRR (Memory Type Range Register) support" if EXPERT
|
|
---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.
|
|
|
|
See <file:Documentation/x86/mtrr.txt> for more information.
|
|
|
|
config MTRR_SANITIZER
|
|
def_bool y
|
|
prompt "MTRR cleanup support"
|
|
depends on MTRR
|
|
---help---
|
|
Convert MTRR layout from continuous to discrete, so X drivers can
|
|
add writeback entries.
|
|
|
|
Can be disabled with disable_mtrr_cleanup on the kernel command line.
|
|
The largest mtrr entry size for a continuous block can be set with
|
|
mtrr_chunk_size.
|
|
|
|
If unsure, say Y.
|
|
|
|
config MTRR_SANITIZER_ENABLE_DEFAULT
|
|
int "MTRR cleanup enable value (0-1)"
|
|
range 0 1
|
|
default "0"
|
|
depends on MTRR_SANITIZER
|
|
---help---
|
|
Enable mtrr cleanup default value
|
|
|
|
config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
|
|
int "MTRR cleanup spare reg num (0-7)"
|
|
range 0 7
|
|
default "1"
|
|
depends on MTRR_SANITIZER
|
|
---help---
|
|
mtrr cleanup spare entries default, it can be changed via
|
|
mtrr_spare_reg_nr=N on the kernel command line.
|
|
|
|
config X86_PAT
|
|
def_bool y
|
|
prompt "x86 PAT support" if EXPERT
|
|
depends on MTRR
|
|
---help---
|
|
Use PAT attributes to setup page level cache control.
|
|
|
|
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,
|
|
spontaneous reboots) or a non-working video driver.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARCH_USES_PG_UNCACHED
|
|
def_bool y
|
|
depends on X86_PAT
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
config EFI
|
|
bool "EFI runtime service support"
|
|
depends on ACPI
|
|
select UCS2_STRING
|
|
---help---
|
|
This enables the kernel to use EFI runtime services that are
|
|
available (such as the EFI variable services).
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
See Documentation/efi-stub.txt for more information.
|
|
|
|
config SECCOMP
|
|
def_bool y
|
|
prompt "Enable seccomp to safely compute untrusted bytecode"
|
|
---help---
|
|
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
|
|
enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
|
|
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
|
|
bool "Enable -fstack-protector buffer overflow detection"
|
|
---help---
|
|
This option turns on the -fstack-protector GCC feature. This
|
|
feature puts, at the beginning of functions, a canary value on
|
|
the stack just before the return address, and validates
|
|
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
|
|
detected and for those versions, this configuration option is
|
|
ignored. (and a warning is printed during bootup)
|
|
|
|
source kernel/Kconfig.hz
|
|
|
|
config KEXEC
|
|
bool "kexec system call"
|
|
---help---
|
|
kexec is a system call that implements the ability to shutdown your
|
|
current kernel, and to start another kernel. It is like a reboot
|
|
but it is independent of the system firmware. And like a reboot
|
|
you can start any kernel with it, not just Linux.
|
|
|
|
The name comes from the similarity to the exec system call.
|
|
|
|
It is an ongoing process to be certain the hardware in a machine
|
|
is properly shutdown, so do not be surprised if this code does not
|
|
initially work for you. As of this writing the exact hardware
|
|
interface is strongly in flux, so no good recommendation can be
|
|
made.
|
|
|
|
config CRASH_DUMP
|
|
bool "kernel crash dumps"
|
|
depends on X86_64 || (X86_32 && HIGHMEM)
|
|
---help---
|
|
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
|
|
|
|
config KEXEC_JUMP
|
|
bool "kexec jump"
|
|
depends on KEXEC && HIBERNATION
|
|
---help---
|
|
Jump between original kernel and kexeced kernel and invoke
|
|
code in physical address mode via KEXEC
|
|
|
|
config PHYSICAL_START
|
|
hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
|
|
default "0x1000000"
|
|
---help---
|
|
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.
|
|
|
|
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.
|
|
|
|
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
|
|
bool "Build a relocatable kernel"
|
|
default y
|
|
---help---
|
|
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.
|
|
|
|
# Relocation on x86-32 needs some additional build support
|
|
config X86_NEED_RELOCS
|
|
def_bool y
|
|
depends on X86_32 && RELOCATABLE
|
|
|
|
config PHYSICAL_ALIGN
|
|
hex "Alignment value to which kernel should be aligned"
|
|
default "0x1000000"
|
|
range 0x2000 0x1000000 if X86_32
|
|
range 0x200000 0x1000000 if X86_64
|
|
---help---
|
|
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.
|
|
|
|
On 32-bit this value must be a multiple of 0x2000. On 64-bit
|
|
this value must be a multiple of 0x200000.
|
|
|
|
Don't change this unless you know what you are doing.
|
|
|
|
config HOTPLUG_CPU
|
|
bool "Support for hot-pluggable CPUs"
|
|
depends on SMP
|
|
---help---
|
|
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.
|
|
|
|
config BOOTPARAM_HOTPLUG_CPU0
|
|
bool "Set default setting of cpu0_hotpluggable"
|
|
default n
|
|
depends on HOTPLUG_CPU
|
|
---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.
|
|
|
|
config DEBUG_HOTPLUG_CPU0
|
|
def_bool n
|
|
prompt "Debug CPU0 hotplug"
|
|
depends on HOTPLUG_CPU
|
|
---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.
|
|
|
|
config COMPAT_VDSO
|
|
def_bool y
|
|
prompt "Compat VDSO support"
|
|
depends on X86_32 || IA32_EMULATION
|
|
---help---
|
|
Map the 32-bit VDSO to the predictable old-style address too.
|
|
|
|
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.
|
|
|
|
config CMDLINE_BOOL
|
|
bool "Built-in kernel command line"
|
|
---help---
|
|
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 ""
|
|
---help---
|
|
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
|
|
---help---
|
|
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.
|
|
|
|
endmenu
|
|
|
|
config ARCH_ENABLE_MEMORY_HOTPLUG
|
|
def_bool y
|
|
depends on X86_64 || (X86_32 && HIGHMEM)
|
|
|
|
config ARCH_ENABLE_MEMORY_HOTREMOVE
|
|
def_bool y
|
|
depends on MEMORY_HOTPLUG
|
|
|
|
config USE_PERCPU_NUMA_NODE_ID
|
|
def_bool y
|
|
depends on NUMA
|
|
|
|
config ARCH_ENABLE_SPLIT_PMD_PTLOCK
|
|
def_bool y
|
|
depends on X86_64 || X86_PAE
|
|
|
|
menu "Power management and ACPI options"
|
|
|
|
config ARCH_HIBERNATION_HEADER
|
|
def_bool y
|
|
depends on X86_64 && HIBERNATION
|
|
|
|
source "kernel/power/Kconfig"
|
|
|
|
source "drivers/acpi/Kconfig"
|
|
|
|
source "drivers/sfi/Kconfig"
|
|
|
|
config X86_APM_BOOT
|
|
def_bool y
|
|
depends on APM
|
|
|
|
menuconfig APM
|
|
tristate "APM (Advanced Power Management) BIOS support"
|
|
depends on X86_32 && PM_SLEEP
|
|
---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
|
|
and more information, read <file:Documentation/power/apm-acpi.txt>
|
|
and the Battery Powered Linux mini-HOWTO, available from
|
|
<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"
|
|
---help---
|
|
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
|
|
depends on CPU_IDLE
|
|
bool "Make CPU Idle calls when idle"
|
|
---help---
|
|
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"
|
|
---help---
|
|
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"
|
|
---help---
|
|
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
|
|
|
|
source "drivers/cpufreq/Kconfig"
|
|
|
|
source "drivers/cpuidle/Kconfig"
|
|
|
|
source "drivers/idle/Kconfig"
|
|
|
|
endmenu
|
|
|
|
|
|
menu "Bus options (PCI etc.)"
|
|
|
|
config PCI
|
|
bool "PCI support"
|
|
default y
|
|
---help---
|
|
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"
|
|
depends on X86_32 && PCI
|
|
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"
|
|
|
|
config PCI_GOOLPC
|
|
bool "OLPC XO-1"
|
|
depends on OLPC
|
|
|
|
config PCI_GOANY
|
|
bool "Any"
|
|
|
|
endchoice
|
|
|
|
config PCI_BIOS
|
|
def_bool y
|
|
depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
|
|
|
|
# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
|
|
config PCI_DIRECT
|
|
def_bool y
|
|
depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
|
|
|
|
config PCI_MMCONFIG
|
|
def_bool y
|
|
depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
|
|
|
|
config PCI_OLPC
|
|
def_bool y
|
|
depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
|
|
|
|
config PCI_XEN
|
|
def_bool y
|
|
depends on PCI && XEN
|
|
select SWIOTLB_XEN
|
|
|
|
config PCI_DOMAINS
|
|
def_bool y
|
|
depends on PCI
|
|
|
|
config PCI_MMCONFIG
|
|
bool "Support mmconfig PCI config space access"
|
|
depends on X86_64 && PCI && ACPI
|
|
|
|
config PCI_CNB20LE_QUIRK
|
|
bool "Read CNB20LE Host Bridge Windows" if EXPERT
|
|
depends on PCI
|
|
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.
|
|
|
|
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.
|
|
|
|
source "drivers/pci/pcie/Kconfig"
|
|
|
|
source "drivers/pci/Kconfig"
|
|
|
|
# x86_64 have no ISA slots, but can have ISA-style DMA.
|
|
config ISA_DMA_API
|
|
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.
|
|
|
|
if X86_32
|
|
|
|
config ISA
|
|
bool "ISA support"
|
|
---help---
|
|
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"
|
|
---help---
|
|
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"
|
|
depends on SCx200
|
|
default y
|
|
---help---
|
|
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.
|
|
|
|
config OLPC
|
|
bool "One Laptop Per Child support"
|
|
depends on !X86_PAE
|
|
select GPIOLIB
|
|
select OF
|
|
select OF_PROMTREE
|
|
select IRQ_DOMAIN
|
|
---help---
|
|
Add support for detecting the unique features of the OLPC
|
|
XO hardware.
|
|
|
|
config OLPC_XO1_PM
|
|
bool "OLPC XO-1 Power Management"
|
|
depends on OLPC && MFD_CS5535 && PM_SLEEP
|
|
select MFD_CORE
|
|
---help---
|
|
Add support for poweroff and suspend of the OLPC XO-1 laptop.
|
|
|
|
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.
|
|
|
|
config OLPC_XO1_SCI
|
|
bool "OLPC XO-1 SCI extras"
|
|
depends on OLPC && OLPC_XO1_PM
|
|
depends on INPUT=y
|
|
select POWER_SUPPLY
|
|
select GPIO_CS5535
|
|
select MFD_CORE
|
|
---help---
|
|
Add support for SCI-based features of the OLPC XO-1 laptop:
|
|
- EC-driven system wakeups
|
|
- Power button
|
|
- Ebook switch
|
|
- Lid switch
|
|
- AC adapter status updates
|
|
- Battery status updates
|
|
|
|
config OLPC_XO15_SCI
|
|
bool "OLPC XO-1.5 SCI extras"
|
|
depends on OLPC && ACPI
|
|
select POWER_SUPPLY
|
|
---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
|
|
|
|
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.
|
|
|
|
config NET5501
|
|
bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
|
|
select GPIOLIB
|
|
---help---
|
|
This option enables system support for the Soekris Engineering net5501.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
endif # X86_32
|
|
|
|
config AMD_NB
|
|
def_bool y
|
|
depends on CPU_SUP_AMD && PCI
|
|
|
|
source "drivers/pcmcia/Kconfig"
|
|
|
|
source "drivers/pci/hotplug/Kconfig"
|
|
|
|
config RAPIDIO
|
|
tristate "RapidIO support"
|
|
depends on PCI
|
|
default n
|
|
help
|
|
If enabled this option will include drivers and the core
|
|
infrastructure code to support RapidIO interconnect devices.
|
|
|
|
source "drivers/rapidio/Kconfig"
|
|
|
|
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.
|
|
|
|
endmenu
|
|
|
|
|
|
menu "Executable file formats / Emulations"
|
|
|
|
source "fs/Kconfig.binfmt"
|
|
|
|
config IA32_EMULATION
|
|
bool "IA32 Emulation"
|
|
depends on X86_64
|
|
select BINFMT_ELF
|
|
select COMPAT_BINFMT_ELF
|
|
select HAVE_UID16
|
|
---help---
|
|
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.
|
|
|
|
config IA32_AOUT
|
|
tristate "IA32 a.out support"
|
|
depends on IA32_EMULATION
|
|
---help---
|
|
Support old a.out binaries in the 32bit emulation.
|
|
|
|
config X86_X32
|
|
bool "x32 ABI for 64-bit mode"
|
|
depends on X86_64 && IA32_EMULATION
|
|
---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.
|
|
|
|
config COMPAT
|
|
def_bool y
|
|
depends on IA32_EMULATION || X86_X32
|
|
select ARCH_WANT_OLD_COMPAT_IPC
|
|
|
|
if COMPAT
|
|
config COMPAT_FOR_U64_ALIGNMENT
|
|
def_bool y
|
|
|
|
config SYSVIPC_COMPAT
|
|
def_bool y
|
|
depends on SYSVIPC
|
|
|
|
config KEYS_COMPAT
|
|
def_bool y
|
|
depends on KEYS
|
|
endif
|
|
|
|
endmenu
|
|
|
|
|
|
config HAVE_ATOMIC_IOMAP
|
|
def_bool y
|
|
depends on X86_32
|
|
|
|
config X86_DEV_DMA_OPS
|
|
bool
|
|
depends on X86_64 || STA2X11
|
|
|
|
config X86_DMA_REMAP
|
|
bool
|
|
depends on STA2X11
|
|
|
|
source "net/Kconfig"
|
|
|
|
source "drivers/Kconfig"
|
|
|
|
source "drivers/firmware/Kconfig"
|
|
|
|
source "fs/Kconfig"
|
|
|
|
source "arch/x86/Kconfig.debug"
|
|
|
|
source "security/Kconfig"
|
|
|
|
source "crypto/Kconfig"
|
|
|
|
source "arch/x86/kvm/Kconfig"
|
|
|
|
source "lib/Kconfig"
|