3 bool "64-bit kernel" if ARCH = "x86"
6 Say yes to build a 64-bit kernel - formerly known as x86_64
7 Say no to build a 32-bit kernel - formerly known as i386
18 select X86_DEV_DMA_OPS
19 select ARCH_USE_CMPXCHG_LOCKREF
24 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
25 select HAVE_AOUT if X86_32
26 select HAVE_UNSTABLE_SCHED_CLOCK
27 select ARCH_SUPPORTS_NUMA_BALANCING
28 select ARCH_WANTS_PROT_NUMA_PROT_NONE
31 select HAVE_PCSPKR_PLATFORM
32 select HAVE_PERF_EVENTS
33 select HAVE_IOREMAP_PROT
36 select HAVE_MEMBLOCK_NODE_MAP
37 select ARCH_DISCARD_MEMBLOCK
38 select ARCH_WANT_OPTIONAL_GPIOLIB
39 select ARCH_WANT_FRAME_POINTERS
41 select HAVE_DMA_CONTIGUOUS if !SWIOTLB
42 select HAVE_KRETPROBES
44 select HAVE_KPROBES_ON_FTRACE
45 select HAVE_FTRACE_MCOUNT_RECORD
46 select HAVE_FENTRY if X86_64
47 select HAVE_C_RECORDMCOUNT
48 select HAVE_DYNAMIC_FTRACE
49 select HAVE_DYNAMIC_FTRACE_WITH_REGS
50 select HAVE_FUNCTION_TRACER
51 select HAVE_FUNCTION_GRAPH_TRACER
52 select HAVE_FUNCTION_GRAPH_FP_TEST
53 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
54 select HAVE_SYSCALL_TRACEPOINTS
55 select SYSCTL_EXCEPTION_TRACE
58 select HAVE_ARCH_TRACEHOOK
59 select HAVE_GENERIC_DMA_COHERENT if X86_32
60 select HAVE_EFFICIENT_UNALIGNED_ACCESS
61 select USER_STACKTRACE_SUPPORT
62 select HAVE_REGS_AND_STACK_ACCESS_API
63 select HAVE_DMA_API_DEBUG
64 select HAVE_KERNEL_GZIP
65 select HAVE_KERNEL_BZIP2
66 select HAVE_KERNEL_LZMA
68 select HAVE_KERNEL_LZO
69 select HAVE_KERNEL_LZ4
70 select HAVE_HW_BREAKPOINT
71 select HAVE_MIXED_BREAKPOINTS_REGS
73 select HAVE_PERF_EVENTS_NMI
75 select HAVE_PERF_USER_STACK_DUMP
76 select HAVE_DEBUG_KMEMLEAK
78 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
79 select HAVE_CMPXCHG_LOCAL
80 select HAVE_CMPXCHG_DOUBLE
81 select HAVE_ARCH_KMEMCHECK
82 select HAVE_USER_RETURN_NOTIFIER
83 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
84 select HAVE_ARCH_JUMP_LABEL
85 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
87 select GENERIC_FIND_FIRST_BIT
88 select GENERIC_IRQ_PROBE
89 select GENERIC_PENDING_IRQ if SMP
90 select GENERIC_IRQ_SHOW
91 select GENERIC_CLOCKEVENTS_MIN_ADJUST
92 select IRQ_FORCED_THREADING
93 select USE_GENERIC_SMP_HELPERS if SMP
94 select HAVE_BPF_JIT if X86_64
95 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
97 select ARCH_HAVE_NMI_SAFE_CMPXCHG
99 select DCACHE_WORD_ACCESS
100 select GENERIC_SMP_IDLE_THREAD
101 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
102 select HAVE_ARCH_SECCOMP_FILTER
103 select BUILDTIME_EXTABLE_SORT
104 select GENERIC_CMOS_UPDATE
105 select HAVE_ARCH_SOFT_DIRTY
106 select CLOCKSOURCE_WATCHDOG
107 select GENERIC_CLOCKEVENTS
108 select ARCH_CLOCKSOURCE_DATA if X86_64
109 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
110 select GENERIC_TIME_VSYSCALL if X86_64
111 select KTIME_SCALAR if X86_32
112 select GENERIC_STRNCPY_FROM_USER
113 select GENERIC_STRNLEN_USER
114 select HAVE_CONTEXT_TRACKING if X86_64
115 select HAVE_IRQ_TIME_ACCOUNTING
117 select MODULES_USE_ELF_REL if X86_32
118 select MODULES_USE_ELF_RELA if X86_64
119 select CLONE_BACKWARDS if X86_32
120 select ARCH_USE_BUILTIN_BSWAP
121 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
122 select OLD_SIGACTION if X86_32
123 select COMPAT_OLD_SIGACTION if IA32_EMULATION
125 select HAVE_DEBUG_STACKOVERFLOW
127 config INSTRUCTION_DECODER
129 depends on KPROBES || PERF_EVENTS || UPROBES
133 default "elf32-i386" if X86_32
134 default "elf64-x86-64" if X86_64
136 config ARCH_DEFCONFIG
138 default "arch/x86/configs/i386_defconfig" if X86_32
139 default "arch/x86/configs/x86_64_defconfig" if X86_64
141 config LOCKDEP_SUPPORT
144 config STACKTRACE_SUPPORT
147 config HAVE_LATENCYTOP_SUPPORT
156 config NEED_DMA_MAP_STATE
158 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG
160 config NEED_SG_DMA_LENGTH
163 config GENERIC_ISA_DMA
165 depends on ISA_DMA_API
170 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
172 config GENERIC_BUG_RELATIVE_POINTERS
175 config GENERIC_HWEIGHT
178 config ARCH_MAY_HAVE_PC_FDC
180 depends on ISA_DMA_API
182 config RWSEM_XCHGADD_ALGORITHM
185 config GENERIC_CALIBRATE_DELAY
188 config ARCH_HAS_CPU_RELAX
191 config ARCH_HAS_CACHE_LINE_SIZE
194 config ARCH_HAS_CPU_AUTOPROBE
197 config HAVE_SETUP_PER_CPU_AREA
200 config NEED_PER_CPU_EMBED_FIRST_CHUNK
203 config NEED_PER_CPU_PAGE_FIRST_CHUNK
206 config ARCH_HIBERNATION_POSSIBLE
209 config ARCH_SUSPEND_POSSIBLE
212 config ARCH_WANT_HUGE_PMD_SHARE
215 config ARCH_WANT_GENERAL_HUGETLB
226 config ARCH_SUPPORTS_OPTIMIZED_INLINING
229 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
232 config HAVE_INTEL_TXT
234 depends on INTEL_IOMMU && ACPI
238 depends on X86_32 && SMP
242 depends on X86_64 && SMP
248 config X86_32_LAZY_GS
250 depends on X86_32 && !CC_STACKPROTECTOR
252 config ARCH_HWEIGHT_CFLAGS
254 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
255 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
257 config ARCH_CPU_PROBE_RELEASE
259 depends on HOTPLUG_CPU
261 config ARCH_SUPPORTS_UPROBES
264 source "init/Kconfig"
265 source "kernel/Kconfig.freezer"
267 menu "Processor type and features"
270 bool "DMA memory allocation support" if EXPERT
273 DMA memory allocation support allows devices with less than 32-bit
274 addressing to allocate within the first 16MB of address space.
275 Disable if no such devices will be used.
280 bool "Symmetric multi-processing support"
282 This enables support for systems with more than one CPU. If you have
283 a system with only one CPU, like most personal computers, say N. If
284 you have a system with more than one CPU, say Y.
286 If you say N here, the kernel will run on single and multiprocessor
287 machines, but will use only one CPU of a multiprocessor machine. If
288 you say Y here, the kernel will run on many, but not all,
289 singleprocessor machines. On a singleprocessor machine, the kernel
290 will run faster if you say N here.
292 Note that if you say Y here and choose architecture "586" or
293 "Pentium" under "Processor family", the kernel will not work on 486
294 architectures. Similarly, multiprocessor kernels for the "PPro"
295 architecture may not work on all Pentium based boards.
297 People using multiprocessor machines who say Y here should also say
298 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
299 Management" code will be disabled if you say Y here.
301 See also <file:Documentation/x86/i386/IO-APIC.txt>,
302 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
303 <http://www.tldp.org/docs.html#howto>.
305 If you don't know what to do here, say N.
308 bool "Support x2apic"
309 depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
311 This enables x2apic support on CPUs that have this feature.
313 This allows 32-bit apic IDs (so it can support very large systems),
314 and accesses the local apic via MSRs not via mmio.
316 If you don't know what to do here, say N.
319 bool "Enable MPS table" if ACPI || SFI
321 depends on X86_LOCAL_APIC
323 For old smp systems that do not have proper acpi support. Newer systems
324 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
327 bool "Support for big SMP systems with more than 8 CPUs"
328 depends on X86_32 && SMP
330 This option is needed for the systems that have more than 8 CPUs
334 depends on X86_GOLDFISH
337 config X86_EXTENDED_PLATFORM
338 bool "Support for extended (non-PC) x86 platforms"
341 If you disable this option then the kernel will only support
342 standard PC platforms. (which covers the vast majority of
345 If you enable this option then you'll be able to select support
346 for the following (non-PC) 32 bit x86 platforms:
347 Goldfish (Android emulator)
351 SGI 320/540 (Visual Workstation)
352 STA2X11-based (e.g. Northville)
353 Summit/EXA (IBM x440)
354 Unisys ES7000 IA32 series
355 Moorestown MID devices
357 If you have one of these systems, or if you want to build a
358 generic distribution kernel, say Y here - otherwise say N.
362 config X86_EXTENDED_PLATFORM
363 bool "Support for extended (non-PC) x86 platforms"
366 If you disable this option then the kernel will only support
367 standard PC platforms. (which covers the vast majority of
370 If you enable this option then you'll be able to select support
371 for the following (non-PC) 64 bit x86 platforms:
376 If you have one of these systems, or if you want to build a
377 generic distribution kernel, say Y here - otherwise say N.
379 # This is an alphabetically sorted list of 64 bit extended platforms
380 # Please maintain the alphabetic order if and when there are additions
382 bool "Numascale NumaChip"
384 depends on X86_EXTENDED_PLATFORM
387 depends on X86_X2APIC
388 depends on PCI_MMCONFIG
390 Adds support for Numascale NumaChip large-SMP systems. Needed to
391 enable more than ~168 cores.
392 If you don't have one of these, you should say N here.
396 select HYPERVISOR_GUEST
398 depends on X86_64 && PCI
399 depends on X86_EXTENDED_PLATFORM
402 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
403 supposed to run on these EM64T-based machines. Only choose this option
404 if you have one of these machines.
407 bool "SGI Ultraviolet"
409 depends on X86_EXTENDED_PLATFORM
411 depends on X86_X2APIC
413 This option is needed in order to support SGI Ultraviolet systems.
414 If you don't have one of these, you should say N here.
416 # Following is an alphabetically sorted list of 32 bit extended platforms
417 # Please maintain the alphabetic order if and when there are additions
420 bool "Goldfish (Virtual Platform)"
422 depends on X86_EXTENDED_PLATFORM
424 Enable support for the Goldfish virtual platform used primarily
425 for Android development. Unless you are building for the Android
426 Goldfish emulator say N here.
429 bool "CE4100 TV platform"
431 depends on PCI_GODIRECT
433 depends on X86_EXTENDED_PLATFORM
434 select X86_REBOOTFIXUPS
436 select OF_EARLY_FLATTREE
439 Select for the Intel CE media processor (CE4100) SOC.
440 This option compiles in support for the CE4100 SOC for settop
441 boxes and media devices.
443 config X86_WANT_INTEL_MID
444 bool "Intel MID platform support"
446 depends on X86_EXTENDED_PLATFORM
448 Select to build a kernel capable of supporting Intel MID platform
449 systems which do not have the PCI legacy interfaces (Moorestown,
450 Medfield). If you are building for a PC class system say N here.
452 if X86_WANT_INTEL_MID
458 bool "Medfield MID platform"
461 depends on X86_IO_APIC
469 select X86_PLATFORM_DEVICES
470 select MFD_INTEL_MSIC
472 Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin
473 Internet Device(MID) platform.
474 Unlike standard x86 PCs, Medfield does not have many legacy devices
475 nor standard legacy replacement devices/features. e.g. Medfield does
476 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
480 config X86_INTEL_LPSS
481 bool "Intel Low Power Subsystem Support"
486 Select to build support for Intel Low Power Subsystem such as
487 found on Intel Lynxpoint PCH. Selecting this option enables
488 things like clock tree (common clock framework) and pincontrol
489 which are needed by the LPSS peripheral drivers.
492 bool "RDC R-321x SoC"
494 depends on X86_EXTENDED_PLATFORM
496 select X86_REBOOTFIXUPS
498 This option is needed for RDC R-321x system-on-chip, also known
500 If you don't have one of these chips, you should say N here.
502 config X86_32_NON_STANDARD
503 bool "Support non-standard 32-bit SMP architectures"
504 depends on X86_32 && SMP
505 depends on X86_EXTENDED_PLATFORM
507 This option compiles in the NUMAQ, Summit, bigsmp, ES7000,
508 STA2X11, default subarchitectures. It is intended for a generic
509 binary kernel. If you select them all, kernel will probe it
510 one by one and will fallback to default.
512 # Alphabetically sorted list of Non standard 32 bit platforms
515 bool "NUMAQ (IBM/Sequent)"
516 depends on X86_32_NON_STANDARD
521 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
522 NUMA multiquad box. This changes the way that processors are
523 bootstrapped, and uses Clustered Logical APIC addressing mode instead
524 of Flat Logical. You will need a new lynxer.elf file to flash your
525 firmware with - send email to <Martin.Bligh@us.ibm.com>.
527 config X86_SUPPORTS_MEMORY_FAILURE
529 # MCE code calls memory_failure():
531 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
532 depends on !X86_NUMAQ
533 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
534 depends on X86_64 || !SPARSEMEM
535 select ARCH_SUPPORTS_MEMORY_FAILURE
538 bool "SGI 320/540 (Visual Workstation)"
539 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
540 depends on X86_32_NON_STANDARD
542 The SGI Visual Workstation series is an IA32-based workstation
543 based on SGI systems chips with some legacy PC hardware attached.
545 Say Y here to create a kernel to run on the SGI 320 or 540.
547 A kernel compiled for the Visual Workstation will run on general
548 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
551 bool "STA2X11 Companion Chip Support"
552 depends on X86_32_NON_STANDARD && PCI
553 select X86_DEV_DMA_OPS
557 select ARCH_REQUIRE_GPIOLIB
560 This adds support for boards based on the STA2X11 IO-Hub,
561 a.k.a. "ConneXt". The chip is used in place of the standard
562 PC chipset, so all "standard" peripherals are missing. If this
563 option is selected the kernel will still be able to boot on
564 standard PC machines.
567 bool "Summit/EXA (IBM x440)"
568 depends on X86_32_NON_STANDARD
570 This option is needed for IBM systems that use the Summit/EXA chipset.
571 In particular, it is needed for the x440.
574 bool "Unisys ES7000 IA32 series"
575 depends on X86_32_NON_STANDARD && X86_BIGSMP
577 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
578 supposed to run on an IA32-based Unisys ES7000 system.
581 tristate "Eurobraille/Iris poweroff module"
584 The Iris machines from EuroBraille do not have APM or ACPI support
585 to shut themselves down properly. A special I/O sequence is
586 needed to do so, which is what this module does at
589 This is only for Iris machines from EuroBraille.
593 config SCHED_OMIT_FRAME_POINTER
595 prompt "Single-depth WCHAN output"
598 Calculate simpler /proc/<PID>/wchan values. If this option
599 is disabled then wchan values will recurse back to the
600 caller function. This provides more accurate wchan values,
601 at the expense of slightly more scheduling overhead.
603 If in doubt, say "Y".
605 menuconfig HYPERVISOR_GUEST
606 bool "Linux guest support"
608 Say Y here to enable options for running Linux under various hyper-
609 visors. This option enables basic hypervisor detection and platform
612 If you say N, all options in this submenu will be skipped and
613 disabled, and Linux guest support won't be built in.
618 bool "Enable paravirtualization code"
620 This changes the kernel so it can modify itself when it is run
621 under a hypervisor, potentially improving performance significantly
622 over full virtualization. However, when run without a hypervisor
623 the kernel is theoretically slower and slightly larger.
625 config PARAVIRT_DEBUG
626 bool "paravirt-ops debugging"
627 depends on PARAVIRT && DEBUG_KERNEL
629 Enable to debug paravirt_ops internals. Specifically, BUG if
630 a paravirt_op is missing when it is called.
632 config PARAVIRT_SPINLOCKS
633 bool "Paravirtualization layer for spinlocks"
634 depends on PARAVIRT && SMP
635 select UNINLINE_SPIN_UNLOCK
637 Paravirtualized spinlocks allow a pvops backend to replace the
638 spinlock implementation with something virtualization-friendly
639 (for example, block the virtual CPU rather than spinning).
641 Unfortunately the downside is an up to 5% performance hit on
642 native kernels, with various workloads.
644 If you are unsure how to answer this question, answer N.
646 source "arch/x86/xen/Kconfig"
649 bool "KVM Guest support (including kvmclock)"
651 select PARAVIRT_CLOCK
654 This option enables various optimizations for running under the KVM
655 hypervisor. It includes a paravirtualized clock, so that instead
656 of relying on a PIT (or probably other) emulation by the
657 underlying device model, the host provides the guest with
658 timing infrastructure such as time of day, and system time
661 bool "Enable debug information for KVM Guests in debugfs"
662 depends on KVM_GUEST && DEBUG_FS
665 This option enables collection of various statistics for KVM guest.
666 Statistics are displayed in debugfs filesystem. Enabling this option
667 may incur significant overhead.
669 source "arch/x86/lguest/Kconfig"
671 config PARAVIRT_TIME_ACCOUNTING
672 bool "Paravirtual steal time accounting"
676 Select this option to enable fine granularity task steal time
677 accounting. Time spent executing other tasks in parallel with
678 the current vCPU is discounted from the vCPU power. To account for
679 that, there can be a small performance impact.
681 If in doubt, say N here.
683 config PARAVIRT_CLOCK
686 endif #HYPERVISOR_GUEST
694 This option adds a kernel parameter 'memtest', which allows memtest
696 memtest=0, mean disabled; -- default
697 memtest=1, mean do 1 test pattern;
699 memtest=4, mean do 4 test patterns.
700 If you are unsure how to answer this question, answer N.
702 config X86_SUMMIT_NUMA
704 depends on X86_32 && NUMA && X86_32_NON_STANDARD
706 config X86_CYCLONE_TIMER
708 depends on X86_SUMMIT
710 source "arch/x86/Kconfig.cpu"
714 prompt "HPET Timer Support" if X86_32
716 Use the IA-PC HPET (High Precision Event Timer) to manage
717 time in preference to the PIT and RTC, if a HPET is
719 HPET is the next generation timer replacing legacy 8254s.
720 The HPET provides a stable time base on SMP
721 systems, unlike the TSC, but it is more expensive to access,
722 as it is off-chip. You can find the HPET spec at
723 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
725 You can safely choose Y here. However, HPET will only be
726 activated if the platform and the BIOS support this feature.
727 Otherwise the 8254 will be used for timing services.
729 Choose N to continue using the legacy 8254 timer.
731 config HPET_EMULATE_RTC
733 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
736 def_bool y if X86_INTEL_MID
737 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
739 depends on X86_INTEL_MID && SFI
741 APB timer is the replacement for 8254, HPET on X86 MID platforms.
742 The APBT provides a stable time base on SMP
743 systems, unlike the TSC, but it is more expensive to access,
744 as it is off-chip. APB timers are always running regardless of CPU
745 C states, they are used as per CPU clockevent device when possible.
747 # Mark as expert because too many people got it wrong.
748 # The code disables itself when not needed.
751 bool "Enable DMI scanning" if EXPERT
753 Enabled scanning of DMI to identify machine quirks. Say Y
754 here unless you have verified that your setup is not
755 affected by entries in the DMI blacklist. Required by PNP
759 bool "GART IOMMU support" if EXPERT
762 depends on X86_64 && PCI && AMD_NB
764 Support for full DMA access of devices with 32bit memory access only
765 on systems with more than 3GB. This is usually needed for USB,
766 sound, many IDE/SATA chipsets and some other devices.
767 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
768 based hardware IOMMU and a software bounce buffer based IOMMU used
769 on Intel systems and as fallback.
770 The code is only active when needed (enough memory and limited
771 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
775 bool "IBM Calgary IOMMU support"
777 depends on X86_64 && PCI
779 Support for hardware IOMMUs in IBM's xSeries x366 and x460
780 systems. Needed to run systems with more than 3GB of memory
781 properly with 32-bit PCI devices that do not support DAC
782 (Double Address Cycle). Calgary also supports bus level
783 isolation, where all DMAs pass through the IOMMU. This
784 prevents them from going anywhere except their intended
785 destination. This catches hard-to-find kernel bugs and
786 mis-behaving drivers and devices that do not use the DMA-API
787 properly to set up their DMA buffers. The IOMMU can be
788 turned off at boot time with the iommu=off parameter.
789 Normally the kernel will make the right choice by itself.
792 config CALGARY_IOMMU_ENABLED_BY_DEFAULT
794 prompt "Should Calgary be enabled by default?"
795 depends on CALGARY_IOMMU
797 Should Calgary be enabled by default? if you choose 'y', Calgary
798 will be used (if it exists). If you choose 'n', Calgary will not be
799 used even if it exists. If you choose 'n' and would like to use
800 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
803 # need this always selected by IOMMU for the VIA workaround
807 Support for software bounce buffers used on x86-64 systems
808 which don't have a hardware IOMMU. Using this PCI devices
809 which can only access 32-bits of memory can be used on systems
810 with more than 3 GB of memory.
815 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
818 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
819 depends on X86_64 && SMP && DEBUG_KERNEL
820 select CPUMASK_OFFSTACK
822 Enable maximum number of CPUS and NUMA Nodes for this architecture.
826 int "Maximum number of CPUs" if SMP && !MAXSMP
827 range 2 8 if SMP && X86_32 && !X86_BIGSMP
828 range 2 512 if SMP && !MAXSMP
830 default "4096" if MAXSMP
831 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
834 This allows you to specify the maximum number of CPUs which this
835 kernel will support. The maximum supported value is 512 and the
836 minimum value which makes sense is 2.
838 This is purely to save memory - each supported CPU adds
839 approximately eight kilobytes to the kernel image.
842 bool "SMT (Hyperthreading) scheduler support"
845 SMT scheduler support improves the CPU scheduler's decision making
846 when dealing with Intel Pentium 4 chips with HyperThreading at a
847 cost of slightly increased overhead in some places. If unsure say
852 prompt "Multi-core scheduler support"
855 Multi-core scheduler support improves the CPU scheduler's decision
856 making when dealing with multi-core CPU chips at a cost of slightly
857 increased overhead in some places. If unsure say N here.
859 source "kernel/Kconfig.preempt"
862 bool "Local APIC support on uniprocessors"
863 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
865 A local APIC (Advanced Programmable Interrupt Controller) is an
866 integrated interrupt controller in the CPU. If you have a single-CPU
867 system which has a processor with a local APIC, you can say Y here to
868 enable and use it. If you say Y here even though your machine doesn't
869 have a local APIC, then the kernel will still run with no slowdown at
870 all. The local APIC supports CPU-generated self-interrupts (timer,
871 performance counters), and the NMI watchdog which detects hard
875 bool "IO-APIC support on uniprocessors"
876 depends on X86_UP_APIC
878 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
879 SMP-capable replacement for PC-style interrupt controllers. Most
880 SMP systems and many recent uniprocessor systems have one.
882 If you have a single-CPU system with an IO-APIC, you can say Y here
883 to use it. If you say Y here even though your machine doesn't have
884 an IO-APIC, then the kernel will still run with no slowdown at all.
886 config X86_LOCAL_APIC
888 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
892 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
894 config X86_VISWS_APIC
896 depends on X86_32 && X86_VISWS
898 config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
899 bool "Reroute for broken boot IRQs"
900 depends on X86_IO_APIC
902 This option enables a workaround that fixes a source of
903 spurious interrupts. This is recommended when threaded
904 interrupt handling is used on systems where the generation of
905 superfluous "boot interrupts" cannot be disabled.
907 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
908 entry in the chipset's IO-APIC is masked (as, e.g. the RT
909 kernel does during interrupt handling). On chipsets where this
910 boot IRQ generation cannot be disabled, this workaround keeps
911 the original IRQ line masked so that only the equivalent "boot
912 IRQ" is delivered to the CPUs. The workaround also tells the
913 kernel to set up the IRQ handler on the boot IRQ line. In this
914 way only one interrupt is delivered to the kernel. Otherwise
915 the spurious second interrupt may cause the kernel to bring
916 down (vital) interrupt lines.
918 Only affects "broken" chipsets. Interrupt sharing may be
919 increased on these systems.
922 bool "Machine Check / overheating reporting"
925 Machine Check support allows the processor to notify the
926 kernel if it detects a problem (e.g. overheating, data corruption).
927 The action the kernel takes depends on the severity of the problem,
928 ranging from warning messages to halting the machine.
932 prompt "Intel MCE features"
933 depends on X86_MCE && X86_LOCAL_APIC
935 Additional support for intel specific MCE features such as
940 prompt "AMD MCE features"
941 depends on X86_MCE && X86_LOCAL_APIC
943 Additional support for AMD specific MCE features such as
944 the DRAM Error Threshold.
946 config X86_ANCIENT_MCE
947 bool "Support for old Pentium 5 / WinChip machine checks"
948 depends on X86_32 && X86_MCE
950 Include support for machine check handling on old Pentium 5 or WinChip
951 systems. These typically need to be enabled explicitely on the command
954 config X86_MCE_THRESHOLD
955 depends on X86_MCE_AMD || X86_MCE_INTEL
958 config X86_MCE_INJECT
960 tristate "Machine check injector support"
962 Provide support for injecting machine checks for testing purposes.
963 If you don't know what a machine check is and you don't do kernel
964 QA it is safe to say n.
966 config X86_THERMAL_VECTOR
968 depends on X86_MCE_INTEL
971 bool "Enable VM86 support" if EXPERT
975 This option is required by programs like DOSEMU to run 16-bit legacy
976 code on X86 processors. It also may be needed by software like
977 XFree86 to initialize some video cards via BIOS. Disabling this
978 option saves about 6k.
981 tristate "Toshiba Laptop support"
984 This adds a driver to safely access the System Management Mode of
985 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
986 not work on models with a Phoenix BIOS. The System Management Mode
987 is used to set the BIOS and power saving options on Toshiba portables.
989 For information on utilities to make use of this driver see the
990 Toshiba Linux utilities web site at:
991 <http://www.buzzard.org.uk/toshiba/>.
993 Say Y if you intend to run this kernel on a Toshiba portable.
997 tristate "Dell laptop support"
1000 This adds a driver to safely access the System Management Mode
1001 of the CPU on the Dell Inspiron 8000. The System Management Mode
1002 is used to read cpu temperature and cooling fan status and to
1003 control the fans on the I8K portables.
1005 This driver has been tested only on the Inspiron 8000 but it may
1006 also work with other Dell laptops. You can force loading on other
1007 models by passing the parameter `force=1' to the module. Use at
1010 For information on utilities to make use of this driver see the
1011 I8K Linux utilities web site at:
1012 <http://people.debian.org/~dz/i8k/>
1014 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
1017 config X86_REBOOTFIXUPS
1018 bool "Enable X86 board specific fixups for reboot"
1021 This enables chipset and/or board specific fixups to be done
1022 in order to get reboot to work correctly. This is only needed on
1023 some combinations of hardware and BIOS. The symptom, for which
1024 this config is intended, is when reboot ends with a stalled/hung
1027 Currently, the only fixup is for the Geode machines using
1028 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
1030 Say Y if you want to enable the fixup. Currently, it's safe to
1031 enable this option even if you don't need it.
1035 tristate "CPU microcode loading support"
1039 If you say Y here, you will be able to update the microcode on
1040 certain Intel and AMD processors. The Intel support is for the
1041 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1042 Xeon etc. The AMD support is for families 0x10 and later. You will
1043 obviously need the actual microcode binary data itself which is not
1044 shipped with the Linux kernel.
1046 This option selects the general module only, you need to select
1047 at least one vendor specific module as well.
1049 To compile this driver as a module, choose M here: the module
1050 will be called microcode.
1052 config MICROCODE_INTEL
1053 bool "Intel microcode loading support"
1054 depends on MICROCODE
1058 This options enables microcode patch loading support for Intel
1061 For latest news and information on obtaining all the required
1062 Intel ingredients for this driver, check:
1063 <http://www.urbanmyth.org/microcode/>.
1065 config MICROCODE_AMD
1066 bool "AMD microcode loading support"
1067 depends on MICROCODE
1070 If you select this option, microcode patch loading support for AMD
1071 processors will be enabled.
1073 config MICROCODE_OLD_INTERFACE
1075 depends on MICROCODE
1077 config MICROCODE_INTEL_LIB
1079 depends on MICROCODE_INTEL
1081 config MICROCODE_INTEL_EARLY
1084 config MICROCODE_AMD_EARLY
1087 config MICROCODE_EARLY
1088 bool "Early load microcode"
1089 depends on MICROCODE=y && BLK_DEV_INITRD
1090 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1091 select MICROCODE_AMD_EARLY if MICROCODE_AMD
1094 This option provides functionality to read additional microcode data
1095 at the beginning of initrd image. The data tells kernel to load
1096 microcode to CPU's as early as possible. No functional change if no
1097 microcode data is glued to the initrd, therefore it's safe to say Y.
1100 tristate "/dev/cpu/*/msr - Model-specific register support"
1102 This device gives privileged processes access to the x86
1103 Model-Specific Registers (MSRs). It is a character device with
1104 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1105 MSR accesses are directed to a specific CPU on multi-processor
1109 tristate "/dev/cpu/*/cpuid - CPU information support"
1111 This device gives processes access to the x86 CPUID instruction to
1112 be executed on a specific processor. It is a character device
1113 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1117 prompt "High Memory Support"
1118 default HIGHMEM64G if X86_NUMAQ
1124 depends on !X86_NUMAQ
1126 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1127 However, the address space of 32-bit x86 processors is only 4
1128 Gigabytes large. That means that, if you have a large amount of
1129 physical memory, not all of it can be "permanently mapped" by the
1130 kernel. The physical memory that's not permanently mapped is called
1133 If you are compiling a kernel which will never run on a machine with
1134 more than 1 Gigabyte total physical RAM, answer "off" here (default
1135 choice and suitable for most users). This will result in a "3GB/1GB"
1136 split: 3GB are mapped so that each process sees a 3GB virtual memory
1137 space and the remaining part of the 4GB virtual memory space is used
1138 by the kernel to permanently map as much physical memory as
1141 If the machine has between 1 and 4 Gigabytes physical RAM, then
1144 If more than 4 Gigabytes is used then answer "64GB" here. This
1145 selection turns Intel PAE (Physical Address Extension) mode on.
1146 PAE implements 3-level paging on IA32 processors. PAE is fully
1147 supported by Linux, PAE mode is implemented on all recent Intel
1148 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1149 then the kernel will not boot on CPUs that don't support PAE!
1151 The actual amount of total physical memory will either be
1152 auto detected or can be forced by using a kernel command line option
1153 such as "mem=256M". (Try "man bootparam" or see the documentation of
1154 your boot loader (lilo or loadlin) about how to pass options to the
1155 kernel at boot time.)
1157 If unsure, say "off".
1161 depends on !X86_NUMAQ
1163 Select this if you have a 32-bit processor and between 1 and 4
1164 gigabytes of physical RAM.
1171 Select this if you have a 32-bit processor and more than 4
1172 gigabytes of physical RAM.
1177 prompt "Memory split" if EXPERT
1181 Select the desired split between kernel and user memory.
1183 If the address range available to the kernel is less than the
1184 physical memory installed, the remaining memory will be available
1185 as "high memory". Accessing high memory is a little more costly
1186 than low memory, as it needs to be mapped into the kernel first.
1187 Note that increasing the kernel address space limits the range
1188 available to user programs, making the address space there
1189 tighter. Selecting anything other than the default 3G/1G split
1190 will also likely make your kernel incompatible with binary-only
1193 If you are not absolutely sure what you are doing, leave this
1197 bool "3G/1G user/kernel split"
1198 config VMSPLIT_3G_OPT
1200 bool "3G/1G user/kernel split (for full 1G low memory)"
1202 bool "2G/2G user/kernel split"
1203 config VMSPLIT_2G_OPT
1205 bool "2G/2G user/kernel split (for full 2G low memory)"
1207 bool "1G/3G user/kernel split"
1212 default 0xB0000000 if VMSPLIT_3G_OPT
1213 default 0x80000000 if VMSPLIT_2G
1214 default 0x78000000 if VMSPLIT_2G_OPT
1215 default 0x40000000 if VMSPLIT_1G
1221 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
1224 bool "PAE (Physical Address Extension) Support"
1225 depends on X86_32 && !HIGHMEM4G
1227 PAE is required for NX support, and furthermore enables
1228 larger swapspace support for non-overcommit purposes. It
1229 has the cost of more pagetable lookup overhead, and also
1230 consumes more pagetable space per process.
1232 config ARCH_PHYS_ADDR_T_64BIT
1234 depends on X86_64 || X86_PAE
1236 config ARCH_DMA_ADDR_T_64BIT
1238 depends on X86_64 || HIGHMEM64G
1240 config DIRECT_GBPAGES
1241 bool "Enable 1GB pages for kernel pagetables" if EXPERT
1245 Allow the kernel linear mapping to use 1GB pages on CPUs that
1246 support it. This can improve the kernel's performance a tiny bit by
1247 reducing TLB pressure. If in doubt, say "Y".
1249 # Common NUMA Features
1251 bool "Numa Memory Allocation and Scheduler Support"
1253 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
1254 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
1256 Enable NUMA (Non Uniform Memory Access) support.
1258 The kernel will try to allocate memory used by a CPU on the
1259 local memory controller of the CPU and add some more
1260 NUMA awareness to the kernel.
1262 For 64-bit this is recommended if the system is Intel Core i7
1263 (or later), AMD Opteron, or EM64T NUMA.
1265 For 32-bit this is only needed on (rare) 32-bit-only platforms
1266 that support NUMA topologies, such as NUMAQ / Summit, or if you
1267 boot a 32-bit kernel on a 64-bit NUMA platform.
1269 Otherwise, you should say N.
1271 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1272 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1276 prompt "Old style AMD Opteron NUMA detection"
1277 depends on X86_64 && NUMA && PCI
1279 Enable AMD NUMA node topology detection. You should say Y here if
1280 you have a multi processor AMD system. This uses an old method to
1281 read the NUMA configuration directly from the builtin Northbridge
1282 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1283 which also takes priority if both are compiled in.
1285 config X86_64_ACPI_NUMA
1287 prompt "ACPI NUMA detection"
1288 depends on X86_64 && NUMA && ACPI && PCI
1291 Enable ACPI SRAT based node topology detection.
1293 # Some NUMA nodes have memory ranges that span
1294 # other nodes. Even though a pfn is valid and
1295 # between a node's start and end pfns, it may not
1296 # reside on that node. See memmap_init_zone()
1298 config NODES_SPAN_OTHER_NODES
1300 depends on X86_64_ACPI_NUMA
1303 bool "NUMA emulation"
1306 Enable NUMA emulation. A flat machine will be split
1307 into virtual nodes when booted with "numa=fake=N", where N is the
1308 number of nodes. This is only useful for debugging.
1311 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
1313 default "10" if MAXSMP
1314 default "6" if X86_64
1315 default "4" if X86_NUMAQ
1317 depends on NEED_MULTIPLE_NODES
1319 Specify the maximum number of NUMA Nodes available on the target
1320 system. Increases memory reserved to accommodate various tables.
1322 config ARCH_HAVE_MEMORY_PRESENT
1324 depends on X86_32 && DISCONTIGMEM
1326 config NEED_NODE_MEMMAP_SIZE
1328 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
1330 config ARCH_FLATMEM_ENABLE
1332 depends on X86_32 && !NUMA
1334 config ARCH_DISCONTIGMEM_ENABLE
1336 depends on NUMA && X86_32
1338 config ARCH_DISCONTIGMEM_DEFAULT
1340 depends on NUMA && X86_32
1342 config ARCH_SPARSEMEM_ENABLE
1344 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
1345 select SPARSEMEM_STATIC if X86_32
1346 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1348 config ARCH_SPARSEMEM_DEFAULT
1352 config ARCH_SELECT_MEMORY_MODEL
1354 depends on ARCH_SPARSEMEM_ENABLE
1356 config ARCH_MEMORY_PROBE
1357 bool "Enable sysfs memory/probe interface"
1358 depends on X86_64 && MEMORY_HOTPLUG
1360 This option enables a sysfs memory/probe interface for testing.
1361 See Documentation/memory-hotplug.txt for more information.
1362 If you are unsure how to answer this question, answer N.
1364 config ARCH_PROC_KCORE_TEXT
1366 depends on X86_64 && PROC_KCORE
1368 config ILLEGAL_POINTER_VALUE
1371 default 0xdead000000000000 if X86_64
1376 bool "Allocate 3rd-level pagetables from highmem"
1379 The VM uses one page table entry for each page of physical memory.
1380 For systems with a lot of RAM, this can be wasteful of precious
1381 low memory. Setting this option will put user-space page table
1382 entries in high memory.
1384 config X86_CHECK_BIOS_CORRUPTION
1385 bool "Check for low memory corruption"
1387 Periodically check for memory corruption in low memory, which
1388 is suspected to be caused by BIOS. Even when enabled in the
1389 configuration, it is disabled at runtime. Enable it by
1390 setting "memory_corruption_check=1" on the kernel command
1391 line. By default it scans the low 64k of memory every 60
1392 seconds; see the memory_corruption_check_size and
1393 memory_corruption_check_period parameters in
1394 Documentation/kernel-parameters.txt to adjust this.
1396 When enabled with the default parameters, this option has
1397 almost no overhead, as it reserves a relatively small amount
1398 of memory and scans it infrequently. It both detects corruption
1399 and prevents it from affecting the running system.
1401 It is, however, intended as a diagnostic tool; if repeatable
1402 BIOS-originated corruption always affects the same memory,
1403 you can use memmap= to prevent the kernel from using that
1406 config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
1407 bool "Set the default setting of memory_corruption_check"
1408 depends on X86_CHECK_BIOS_CORRUPTION
1411 Set whether the default state of memory_corruption_check is
1414 config X86_RESERVE_LOW
1415 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1419 Specify the amount of low memory to reserve for the BIOS.
1421 The first page contains BIOS data structures that the kernel
1422 must not use, so that page must always be reserved.
1424 By default we reserve the first 64K of physical RAM, as a
1425 number of BIOSes are known to corrupt that memory range
1426 during events such as suspend/resume or monitor cable
1427 insertion, so it must not be used by the kernel.
1429 You can set this to 4 if you are absolutely sure that you
1430 trust the BIOS to get all its memory reservations and usages
1431 right. If you know your BIOS have problems beyond the
1432 default 64K area, you can set this to 640 to avoid using the
1433 entire low memory range.
1435 If you have doubts about the BIOS (e.g. suspend/resume does
1436 not work or there's kernel crashes after certain hardware
1437 hotplug events) then you might want to enable
1438 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1439 typical corruption patterns.
1441 Leave this to the default value of 64 if you are unsure.
1443 config MATH_EMULATION
1445 prompt "Math emulation" if X86_32
1447 Linux can emulate a math coprocessor (used for floating point
1448 operations) if you don't have one. 486DX and Pentium processors have
1449 a math coprocessor built in, 486SX and 386 do not, unless you added
1450 a 487DX or 387, respectively. (The messages during boot time can
1451 give you some hints here ["man dmesg"].) Everyone needs either a
1452 coprocessor or this emulation.
1454 If you don't have a math coprocessor, you need to say Y here; if you
1455 say Y here even though you have a coprocessor, the coprocessor will
1456 be used nevertheless. (This behavior can be changed with the kernel
1457 command line option "no387", which comes handy if your coprocessor
1458 is broken. Try "man bootparam" or see the documentation of your boot
1459 loader (lilo or loadlin) about how to pass options to the kernel at
1460 boot time.) This means that it is a good idea to say Y here if you
1461 intend to use this kernel on different machines.
1463 More information about the internals of the Linux math coprocessor
1464 emulation can be found in <file:arch/x86/math-emu/README>.
1466 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1467 kernel, it won't hurt.
1471 prompt "MTRR (Memory Type Range Register) support" if EXPERT
1473 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1474 the Memory Type Range Registers (MTRRs) may be used to control
1475 processor access to memory ranges. This is most useful if you have
1476 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1477 allows bus write transfers to be combined into a larger transfer
1478 before bursting over the PCI/AGP bus. This can increase performance
1479 of image write operations 2.5 times or more. Saying Y here creates a
1480 /proc/mtrr file which may be used to manipulate your processor's
1481 MTRRs. Typically the X server should use this.
1483 This code has a reasonably generic interface so that similar
1484 control registers on other processors can be easily supported
1487 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1488 Registers (ARRs) which provide a similar functionality to MTRRs. For
1489 these, the ARRs are used to emulate the MTRRs.
1490 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1491 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1492 write-combining. All of these processors are supported by this code
1493 and it makes sense to say Y here if you have one of them.
1495 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1496 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1497 can lead to all sorts of problems, so it's good to say Y here.
1499 You can safely say Y even if your machine doesn't have MTRRs, you'll
1500 just add about 9 KB to your kernel.
1502 See <file:Documentation/x86/mtrr.txt> for more information.
1504 config MTRR_SANITIZER
1506 prompt "MTRR cleanup support"
1509 Convert MTRR layout from continuous to discrete, so X drivers can
1510 add writeback entries.
1512 Can be disabled with disable_mtrr_cleanup on the kernel command line.
1513 The largest mtrr entry size for a continuous block can be set with
1518 config MTRR_SANITIZER_ENABLE_DEFAULT
1519 int "MTRR cleanup enable value (0-1)"
1522 depends on MTRR_SANITIZER
1524 Enable mtrr cleanup default value
1526 config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1527 int "MTRR cleanup spare reg num (0-7)"
1530 depends on MTRR_SANITIZER
1532 mtrr cleanup spare entries default, it can be changed via
1533 mtrr_spare_reg_nr=N on the kernel command line.
1537 prompt "x86 PAT support" if EXPERT
1540 Use PAT attributes to setup page level cache control.
1542 PATs are the modern equivalents of MTRRs and are much more
1543 flexible than MTRRs.
1545 Say N here if you see bootup problems (boot crash, boot hang,
1546 spontaneous reboots) or a non-working video driver.
1550 config ARCH_USES_PG_UNCACHED
1556 prompt "x86 architectural random number generator" if EXPERT
1558 Enable the x86 architectural RDRAND instruction
1559 (Intel Bull Mountain technology) to generate random numbers.
1560 If supported, this is a high bandwidth, cryptographically
1561 secure hardware random number generator.
1565 prompt "Supervisor Mode Access Prevention" if EXPERT
1567 Supervisor Mode Access Prevention (SMAP) is a security
1568 feature in newer Intel processors. There is a small
1569 performance cost if this enabled and turned on; there is
1570 also a small increase in the kernel size if this is enabled.
1575 bool "EFI runtime service support"
1579 This enables the kernel to use EFI runtime services that are
1580 available (such as the EFI variable services).
1582 This option is only useful on systems that have EFI firmware.
1583 In addition, you should use the latest ELILO loader available
1584 at <http://elilo.sourceforge.net> in order to take advantage
1585 of EFI runtime services. However, even with this option, the
1586 resultant kernel should continue to boot on existing non-EFI
1590 bool "EFI stub support"
1593 This kernel feature allows a bzImage to be loaded directly
1594 by EFI firmware without the use of a bootloader.
1596 See Documentation/x86/efi-stub.txt for more information.
1600 prompt "Enable seccomp to safely compute untrusted bytecode"
1602 This kernel feature is useful for number crunching applications
1603 that may need to compute untrusted bytecode during their
1604 execution. By using pipes or other transports made available to
1605 the process as file descriptors supporting the read/write
1606 syscalls, it's possible to isolate those applications in
1607 their own address space using seccomp. Once seccomp is
1608 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1609 and the task is only allowed to execute a few safe syscalls
1610 defined by each seccomp mode.
1612 If unsure, say Y. Only embedded should say N here.
1614 config CC_STACKPROTECTOR
1615 bool "Enable -fstack-protector buffer overflow detection"
1617 This option turns on the -fstack-protector GCC feature. This
1618 feature puts, at the beginning of functions, a canary value on
1619 the stack just before the return address, and validates
1620 the value just before actually returning. Stack based buffer
1621 overflows (that need to overwrite this return address) now also
1622 overwrite the canary, which gets detected and the attack is then
1623 neutralized via a kernel panic.
1625 This feature requires gcc version 4.2 or above, or a distribution
1626 gcc with the feature backported. Older versions are automatically
1627 detected and for those versions, this configuration option is
1628 ignored. (and a warning is printed during bootup)
1630 source kernel/Kconfig.hz
1633 bool "kexec system call"
1635 kexec is a system call that implements the ability to shutdown your
1636 current kernel, and to start another kernel. It is like a reboot
1637 but it is independent of the system firmware. And like a reboot
1638 you can start any kernel with it, not just Linux.
1640 The name comes from the similarity to the exec system call.
1642 It is an ongoing process to be certain the hardware in a machine
1643 is properly shutdown, so do not be surprised if this code does not
1644 initially work for you. As of this writing the exact hardware
1645 interface is strongly in flux, so no good recommendation can be
1649 bool "kernel crash dumps"
1650 depends on X86_64 || (X86_32 && HIGHMEM)
1652 Generate crash dump after being started by kexec.
1653 This should be normally only set in special crash dump kernels
1654 which are loaded in the main kernel with kexec-tools into
1655 a specially reserved region and then later executed after
1656 a crash by kdump/kexec. The crash dump kernel must be compiled
1657 to a memory address not used by the main kernel or BIOS using
1658 PHYSICAL_START, or it must be built as a relocatable image
1659 (CONFIG_RELOCATABLE=y).
1660 For more details see Documentation/kdump/kdump.txt
1664 depends on KEXEC && HIBERNATION
1666 Jump between original kernel and kexeced kernel and invoke
1667 code in physical address mode via KEXEC
1669 config PHYSICAL_START
1670 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
1673 This gives the physical address where the kernel is loaded.
1675 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1676 bzImage will decompress itself to above physical address and
1677 run from there. Otherwise, bzImage will run from the address where
1678 it has been loaded by the boot loader and will ignore above physical
1681 In normal kdump cases one does not have to set/change this option
1682 as now bzImage can be compiled as a completely relocatable image
1683 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1684 address. This option is mainly useful for the folks who don't want
1685 to use a bzImage for capturing the crash dump and want to use a
1686 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1687 to be specifically compiled to run from a specific memory area
1688 (normally a reserved region) and this option comes handy.
1690 So if you are using bzImage for capturing the crash dump,
1691 leave the value here unchanged to 0x1000000 and set
1692 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1693 for capturing the crash dump change this value to start of
1694 the reserved region. In other words, it can be set based on
1695 the "X" value as specified in the "crashkernel=YM@XM"
1696 command line boot parameter passed to the panic-ed
1697 kernel. Please take a look at Documentation/kdump/kdump.txt
1698 for more details about crash dumps.
1700 Usage of bzImage for capturing the crash dump is recommended as
1701 one does not have to build two kernels. Same kernel can be used
1702 as production kernel and capture kernel. Above option should have
1703 gone away after relocatable bzImage support is introduced. But it
1704 is present because there are users out there who continue to use
1705 vmlinux for dump capture. This option should go away down the
1708 Don't change this unless you know what you are doing.
1711 bool "Build a relocatable kernel"
1714 This builds a kernel image that retains relocation information
1715 so it can be loaded someplace besides the default 1MB.
1716 The relocations tend to make the kernel binary about 10% larger,
1717 but are discarded at runtime.
1719 One use is for the kexec on panic case where the recovery kernel
1720 must live at a different physical address than the primary
1723 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1724 it has been loaded at and the compile time physical address
1725 (CONFIG_PHYSICAL_START) is ignored.
1727 # Relocation on x86-32 needs some additional build support
1728 config X86_NEED_RELOCS
1730 depends on X86_32 && RELOCATABLE
1732 config PHYSICAL_ALIGN
1733 hex "Alignment value to which kernel should be aligned"
1735 range 0x2000 0x1000000 if X86_32
1736 range 0x200000 0x1000000 if X86_64
1738 This value puts the alignment restrictions on physical address
1739 where kernel is loaded and run from. Kernel is compiled for an
1740 address which meets above alignment restriction.
1742 If bootloader loads the kernel at a non-aligned address and
1743 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1744 address aligned to above value and run from there.
1746 If bootloader loads the kernel at a non-aligned address and
1747 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1748 load address and decompress itself to the address it has been
1749 compiled for and run from there. The address for which kernel is
1750 compiled already meets above alignment restrictions. Hence the
1751 end result is that kernel runs from a physical address meeting
1752 above alignment restrictions.
1754 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1755 this value must be a multiple of 0x200000.
1757 Don't change this unless you know what you are doing.
1760 bool "Support for hot-pluggable CPUs"
1763 Say Y here to allow turning CPUs off and on. CPUs can be
1764 controlled through /sys/devices/system/cpu.
1765 ( Note: power management support will enable this option
1766 automatically on SMP systems. )
1767 Say N if you want to disable CPU hotplug.
1769 config BOOTPARAM_HOTPLUG_CPU0
1770 bool "Set default setting of cpu0_hotpluggable"
1772 depends on HOTPLUG_CPU
1774 Set whether default state of cpu0_hotpluggable is on or off.
1776 Say Y here to enable CPU0 hotplug by default. If this switch
1777 is turned on, there is no need to give cpu0_hotplug kernel
1778 parameter and the CPU0 hotplug feature is enabled by default.
1780 Please note: there are two known CPU0 dependencies if you want
1781 to enable the CPU0 hotplug feature either by this switch or by
1782 cpu0_hotplug kernel parameter.
1784 First, resume from hibernate or suspend always starts from CPU0.
1785 So hibernate and suspend are prevented if CPU0 is offline.
1787 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1788 offline if any interrupt can not migrate out of CPU0. There may
1789 be other CPU0 dependencies.
1791 Please make sure the dependencies are under your control before
1792 you enable this feature.
1794 Say N if you don't want to enable CPU0 hotplug feature by default.
1795 You still can enable the CPU0 hotplug feature at boot by kernel
1796 parameter cpu0_hotplug.
1798 config DEBUG_HOTPLUG_CPU0
1800 prompt "Debug CPU0 hotplug"
1801 depends on HOTPLUG_CPU
1803 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1804 soon as possible and boots up userspace with CPU0 offlined. User
1805 can online CPU0 back after boot time.
1807 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1808 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1809 compilation or giving cpu0_hotplug kernel parameter at boot.
1815 prompt "Compat VDSO support"
1816 depends on X86_32 || IA32_EMULATION
1818 Map the 32-bit VDSO to the predictable old-style address too.
1820 Say N here if you are running a sufficiently recent glibc
1821 version (2.3.3 or later), to remove the high-mapped
1822 VDSO mapping and to exclusively use the randomized VDSO.
1827 bool "Built-in kernel command line"
1829 Allow for specifying boot arguments to the kernel at
1830 build time. On some systems (e.g. embedded ones), it is
1831 necessary or convenient to provide some or all of the
1832 kernel boot arguments with the kernel itself (that is,
1833 to not rely on the boot loader to provide them.)
1835 To compile command line arguments into the kernel,
1836 set this option to 'Y', then fill in the
1837 the boot arguments in CONFIG_CMDLINE.
1839 Systems with fully functional boot loaders (i.e. non-embedded)
1840 should leave this option set to 'N'.
1843 string "Built-in kernel command string"
1844 depends on CMDLINE_BOOL
1847 Enter arguments here that should be compiled into the kernel
1848 image and used at boot time. If the boot loader provides a
1849 command line at boot time, it is appended to this string to
1850 form the full kernel command line, when the system boots.
1852 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1853 change this behavior.
1855 In most cases, the command line (whether built-in or provided
1856 by the boot loader) should specify the device for the root
1859 config CMDLINE_OVERRIDE
1860 bool "Built-in command line overrides boot loader arguments"
1861 depends on CMDLINE_BOOL
1863 Set this option to 'Y' to have the kernel ignore the boot loader
1864 command line, and use ONLY the built-in command line.
1866 This is used to work around broken boot loaders. This should
1867 be set to 'N' under normal conditions.
1871 config ARCH_ENABLE_MEMORY_HOTPLUG
1873 depends on X86_64 || (X86_32 && HIGHMEM)
1875 config ARCH_ENABLE_MEMORY_HOTREMOVE
1877 depends on MEMORY_HOTPLUG
1879 config USE_PERCPU_NUMA_NODE_ID
1883 menu "Power management and ACPI options"
1885 config ARCH_HIBERNATION_HEADER
1887 depends on X86_64 && HIBERNATION
1889 source "kernel/power/Kconfig"
1891 source "drivers/acpi/Kconfig"
1893 source "drivers/sfi/Kconfig"
1900 tristate "APM (Advanced Power Management) BIOS support"
1901 depends on X86_32 && PM_SLEEP
1903 APM is a BIOS specification for saving power using several different
1904 techniques. This is mostly useful for battery powered laptops with
1905 APM compliant BIOSes. If you say Y here, the system time will be
1906 reset after a RESUME operation, the /proc/apm device will provide
1907 battery status information, and user-space programs will receive
1908 notification of APM "events" (e.g. battery status change).
1910 If you select "Y" here, you can disable actual use of the APM
1911 BIOS by passing the "apm=off" option to the kernel at boot time.
1913 Note that the APM support is almost completely disabled for
1914 machines with more than one CPU.
1916 In order to use APM, you will need supporting software. For location
1917 and more information, read <file:Documentation/power/apm-acpi.txt>
1918 and the Battery Powered Linux mini-HOWTO, available from
1919 <http://www.tldp.org/docs.html#howto>.
1921 This driver does not spin down disk drives (see the hdparm(8)
1922 manpage ("man 8 hdparm") for that), and it doesn't turn off
1923 VESA-compliant "green" monitors.
1925 This driver does not support the TI 4000M TravelMate and the ACER
1926 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1927 desktop machines also don't have compliant BIOSes, and this driver
1928 may cause those machines to panic during the boot phase.
1930 Generally, if you don't have a battery in your machine, there isn't
1931 much point in using this driver and you should say N. If you get
1932 random kernel OOPSes or reboots that don't seem to be related to
1933 anything, try disabling/enabling this option (or disabling/enabling
1936 Some other things you should try when experiencing seemingly random,
1939 1) make sure that you have enough swap space and that it is
1941 2) pass the "no-hlt" option to the kernel
1942 3) switch on floating point emulation in the kernel and pass
1943 the "no387" option to the kernel
1944 4) pass the "floppy=nodma" option to the kernel
1945 5) pass the "mem=4M" option to the kernel (thereby disabling
1946 all but the first 4 MB of RAM)
1947 6) make sure that the CPU is not over clocked.
1948 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1949 8) disable the cache from your BIOS settings
1950 9) install a fan for the video card or exchange video RAM
1951 10) install a better fan for the CPU
1952 11) exchange RAM chips
1953 12) exchange the motherboard.
1955 To compile this driver as a module, choose M here: the
1956 module will be called apm.
1960 config APM_IGNORE_USER_SUSPEND
1961 bool "Ignore USER SUSPEND"
1963 This option will ignore USER SUSPEND requests. On machines with a
1964 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1965 series notebooks, it is necessary to say Y because of a BIOS bug.
1967 config APM_DO_ENABLE
1968 bool "Enable PM at boot time"
1970 Enable APM features at boot time. From page 36 of the APM BIOS
1971 specification: "When disabled, the APM BIOS does not automatically
1972 power manage devices, enter the Standby State, enter the Suspend
1973 State, or take power saving steps in response to CPU Idle calls."
1974 This driver will make CPU Idle calls when Linux is idle (unless this
1975 feature is turned off -- see "Do CPU IDLE calls", below). This
1976 should always save battery power, but more complicated APM features
1977 will be dependent on your BIOS implementation. You may need to turn
1978 this option off if your computer hangs at boot time when using APM
1979 support, or if it beeps continuously instead of suspending. Turn
1980 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1981 T400CDT. This is off by default since most machines do fine without
1986 bool "Make CPU Idle calls when idle"
1988 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1989 On some machines, this can activate improved power savings, such as
1990 a slowed CPU clock rate, when the machine is idle. These idle calls
1991 are made after the idle loop has run for some length of time (e.g.,
1992 333 mS). On some machines, this will cause a hang at boot time or
1993 whenever the CPU becomes idle. (On machines with more than one CPU,
1994 this option does nothing.)
1996 config APM_DISPLAY_BLANK
1997 bool "Enable console blanking using APM"
1999 Enable console blanking using the APM. Some laptops can use this to
2000 turn off the LCD backlight when the screen blanker of the Linux
2001 virtual console blanks the screen. Note that this is only used by
2002 the virtual console screen blanker, and won't turn off the backlight
2003 when using the X Window system. This also doesn't have anything to
2004 do with your VESA-compliant power-saving monitor. Further, this
2005 option doesn't work for all laptops -- it might not turn off your
2006 backlight at all, or it might print a lot of errors to the console,
2007 especially if you are using gpm.
2009 config APM_ALLOW_INTS
2010 bool "Allow interrupts during APM BIOS calls"
2012 Normally we disable external interrupts while we are making calls to
2013 the APM BIOS as a measure to lessen the effects of a badly behaving
2014 BIOS implementation. The BIOS should reenable interrupts if it
2015 needs to. Unfortunately, some BIOSes do not -- especially those in
2016 many of the newer IBM Thinkpads. If you experience hangs when you
2017 suspend, try setting this to Y. Otherwise, say N.
2021 source "drivers/cpufreq/Kconfig"
2023 source "drivers/cpuidle/Kconfig"
2025 source "drivers/idle/Kconfig"
2030 menu "Bus options (PCI etc.)"
2036 Find out whether you have a PCI motherboard. PCI is the name of a
2037 bus system, i.e. the way the CPU talks to the other stuff inside
2038 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2039 VESA. If you have PCI, say Y, otherwise N.
2042 prompt "PCI access mode"
2043 depends on X86_32 && PCI
2046 On PCI systems, the BIOS can be used to detect the PCI devices and
2047 determine their configuration. However, some old PCI motherboards
2048 have BIOS bugs and may crash if this is done. Also, some embedded
2049 PCI-based systems don't have any BIOS at all. Linux can also try to
2050 detect the PCI hardware directly without using the BIOS.
2052 With this option, you can specify how Linux should detect the
2053 PCI devices. If you choose "BIOS", the BIOS will be used,
2054 if you choose "Direct", the BIOS won't be used, and if you
2055 choose "MMConfig", then PCI Express MMCONFIG will be used.
2056 If you choose "Any", the kernel will try MMCONFIG, then the
2057 direct access method and falls back to the BIOS if that doesn't
2058 work. If unsure, go with the default, which is "Any".
2063 config PCI_GOMMCONFIG
2080 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
2082 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2085 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
2089 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
2093 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
2097 depends on PCI && XEN
2105 bool "Support mmconfig PCI config space access"
2106 depends on X86_64 && PCI && ACPI
2108 config PCI_CNB20LE_QUIRK
2109 bool "Read CNB20LE Host Bridge Windows" if EXPERT
2112 Read the PCI windows out of the CNB20LE host bridge. This allows
2113 PCI hotplug to work on systems with the CNB20LE chipset which do
2116 There's no public spec for this chipset, and this functionality
2117 is known to be incomplete.
2119 You should say N unless you know you need this.
2121 source "drivers/pci/pcie/Kconfig"
2123 source "drivers/pci/Kconfig"
2125 # x86_64 have no ISA slots, but can have ISA-style DMA.
2127 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2130 Enables ISA-style DMA support for devices requiring such controllers.
2138 Find out whether you have ISA slots on your motherboard. ISA is the
2139 name of a bus system, i.e. the way the CPU talks to the other stuff
2140 inside your box. Other bus systems are PCI, EISA, MicroChannel
2141 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2142 newer boards don't support it. If you have ISA, say Y, otherwise N.
2148 The Extended Industry Standard Architecture (EISA) bus was
2149 developed as an open alternative to the IBM MicroChannel bus.
2151 The EISA bus provided some of the features of the IBM MicroChannel
2152 bus while maintaining backward compatibility with cards made for
2153 the older ISA bus. The EISA bus saw limited use between 1988 and
2154 1995 when it was made obsolete by the PCI bus.
2156 Say Y here if you are building a kernel for an EISA-based machine.
2160 source "drivers/eisa/Kconfig"
2163 tristate "NatSemi SCx200 support"
2165 This provides basic support for National Semiconductor's
2166 (now AMD's) Geode processors. The driver probes for the
2167 PCI-IDs of several on-chip devices, so its a good dependency
2168 for other scx200_* drivers.
2170 If compiled as a module, the driver is named scx200.
2172 config SCx200HR_TIMER
2173 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
2177 This driver provides a clocksource built upon the on-chip
2178 27MHz high-resolution timer. Its also a workaround for
2179 NSC Geode SC-1100's buggy TSC, which loses time when the
2180 processor goes idle (as is done by the scheduler). The
2181 other workaround is idle=poll boot option.
2184 bool "One Laptop Per Child support"
2191 Add support for detecting the unique features of the OLPC
2195 bool "OLPC XO-1 Power Management"
2196 depends on OLPC && MFD_CS5535 && PM_SLEEP
2199 Add support for poweroff and suspend of the OLPC XO-1 laptop.
2202 bool "OLPC XO-1 Real Time Clock"
2203 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2205 Add support for the XO-1 real time clock, which can be used as a
2206 programmable wakeup source.
2209 bool "OLPC XO-1 SCI extras"
2210 depends on OLPC && OLPC_XO1_PM
2216 Add support for SCI-based features of the OLPC XO-1 laptop:
2217 - EC-driven system wakeups
2221 - AC adapter status updates
2222 - Battery status updates
2224 config OLPC_XO15_SCI
2225 bool "OLPC XO-1.5 SCI extras"
2226 depends on OLPC && ACPI
2229 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2230 - EC-driven system wakeups
2231 - AC adapter status updates
2232 - Battery status updates
2235 bool "PCEngines ALIX System Support (LED setup)"
2238 This option enables system support for the PCEngines ALIX.
2239 At present this just sets up LEDs for GPIO control on
2240 ALIX2/3/6 boards. However, other system specific setup should
2243 Note: You must still enable the drivers for GPIO and LED support
2244 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2246 Note: You have to set alix.force=1 for boards with Award BIOS.
2249 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2252 This option enables system support for the Soekris Engineering net5501.
2255 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2259 This option enables system support for the Traverse Technologies GEOS.
2262 bool "Technologic Systems TS-5500 platform support"
2264 select CHECK_SIGNATURE
2268 This option enables system support for the Technologic Systems TS-5500.
2274 depends on CPU_SUP_AMD && PCI
2276 source "drivers/pcmcia/Kconfig"
2278 source "drivers/pci/hotplug/Kconfig"
2281 tristate "RapidIO support"
2285 If enabled this option will include drivers and the core
2286 infrastructure code to support RapidIO interconnect devices.
2288 source "drivers/rapidio/Kconfig"
2291 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2293 Firmwares often provide initial graphics framebuffers so the BIOS,
2294 bootloader or kernel can show basic video-output during boot for
2295 user-guidance and debugging. Historically, x86 used the VESA BIOS
2296 Extensions and EFI-framebuffers for this, which are mostly limited
2298 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2299 framebuffers so the new generic system-framebuffer drivers can be
2300 used on x86. If the framebuffer is not compatible with the generic
2301 modes, it is adverticed as fallback platform framebuffer so legacy
2302 drivers like efifb, vesafb and uvesafb can pick it up.
2303 If this option is not selected, all system framebuffers are always
2304 marked as fallback platform framebuffers as usual.
2306 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2307 not be able to pick up generic system framebuffers if this option
2308 is selected. You are highly encouraged to enable simplefb as
2309 replacement if you select this option. simplefb can correctly deal
2310 with generic system framebuffers. But you should still keep vesafb
2311 and others enabled as fallback if a system framebuffer is
2312 incompatible with simplefb.
2319 menu "Executable file formats / Emulations"
2321 source "fs/Kconfig.binfmt"
2323 config IA32_EMULATION
2324 bool "IA32 Emulation"
2327 select COMPAT_BINFMT_ELF
2330 Include code to run legacy 32-bit programs under a
2331 64-bit kernel. You should likely turn this on, unless you're
2332 100% sure that you don't have any 32-bit programs left.
2335 tristate "IA32 a.out support"
2336 depends on IA32_EMULATION
2338 Support old a.out binaries in the 32bit emulation.
2341 bool "x32 ABI for 64-bit mode"
2342 depends on X86_64 && IA32_EMULATION
2344 Include code to run binaries for the x32 native 32-bit ABI
2345 for 64-bit processors. An x32 process gets access to the
2346 full 64-bit register file and wide data path while leaving
2347 pointers at 32 bits for smaller memory footprint.
2349 You will need a recent binutils (2.22 or later) with
2350 elf32_x86_64 support enabled to compile a kernel with this
2355 depends on IA32_EMULATION || X86_X32
2356 select ARCH_WANT_OLD_COMPAT_IPC
2359 config COMPAT_FOR_U64_ALIGNMENT
2362 config SYSVIPC_COMPAT
2374 config HAVE_ATOMIC_IOMAP
2378 config X86_DEV_DMA_OPS
2380 depends on X86_64 || STA2X11
2382 config X86_DMA_REMAP
2386 source "net/Kconfig"
2388 source "drivers/Kconfig"
2390 source "drivers/firmware/Kconfig"
2394 source "arch/x86/Kconfig.debug"
2396 source "security/Kconfig"
2398 source "crypto/Kconfig"
2400 source "arch/x86/kvm/Kconfig"
2402 source "lib/Kconfig"