2 mainmenu "Linux Kernel Configuration for x86"
6 bool "64-bit kernel" if ARCH = "x86"
7 default ARCH = "x86_64"
9 Say yes to build a 64-bit kernel - formerly known as x86_64
10 Say no to build a 32-bit kernel - formerly known as i386
24 config GENERIC_LOCKBREAK
30 config GENERIC_CMOS_UPDATE
33 config CLOCKSOURCE_WATCHDOG
36 config GENERIC_CLOCKEVENTS
39 config GENERIC_CLOCKEVENTS_BROADCAST
41 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
43 config LOCKDEP_SUPPORT
46 config STACKTRACE_SUPPORT
49 config HAVE_LATENCYTOP_SUPPORT
52 config SEMAPHORE_SLEEPERS
67 config GENERIC_ISA_DMA
77 config GENERIC_HWEIGHT
83 config ARCH_MAY_HAVE_PC_FDC
89 config RWSEM_GENERIC_SPINLOCK
92 config RWSEM_XCHGADD_ALGORITHM
95 config ARCH_HAS_ILOG2_U32
98 config ARCH_HAS_ILOG2_U64
101 config GENERIC_CALIBRATE_DELAY
104 config GENERIC_TIME_VSYSCALL
108 config ARCH_HAS_CPU_RELAX
111 config HAVE_SETUP_PER_CPU_AREA
116 config ARCH_HIBERNATION_POSSIBLE
118 depends on !SMP || !X86_VOYAGER
120 config ARCH_SUSPEND_POSSIBLE
122 depends on !X86_VOYAGER
128 config ARCH_POPULATES_NODE_MAP
135 # Use the generic interrupt handling code in kernel/irq/:
136 config GENERIC_HARDIRQS
140 config GENERIC_IRQ_PROBE
144 config GENERIC_PENDING_IRQ
146 depends on GENERIC_HARDIRQS && SMP
151 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
156 depends on X86_32 && SMP
160 depends on X86_64 && SMP
165 depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || (X86_64 && !MK8)
168 config X86_BIOS_REBOOT
170 depends on X86_32 && !(X86_VISWS || X86_VOYAGER)
173 config X86_TRAMPOLINE
175 depends on X86_SMP || (X86_VOYAGER && SMP)
180 source "init/Kconfig"
182 menu "Processor type and features"
184 source "kernel/time/Kconfig"
187 bool "Symmetric multi-processing support"
189 This enables support for systems with more than one CPU. If you have
190 a system with only one CPU, like most personal computers, say N. If
191 you have a system with more than one CPU, say Y.
193 If you say N here, the kernel will run on single and multiprocessor
194 machines, but will use only one CPU of a multiprocessor machine. If
195 you say Y here, the kernel will run on many, but not all,
196 singleprocessor machines. On a singleprocessor machine, the kernel
197 will run faster if you say N here.
199 Note that if you say Y here and choose architecture "586" or
200 "Pentium" under "Processor family", the kernel will not work on 486
201 architectures. Similarly, multiprocessor kernels for the "PPro"
202 architecture may not work on all Pentium based boards.
204 People using multiprocessor machines who say Y here should also say
205 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
206 Management" code will be disabled if you say Y here.
208 See also <file:Documentation/i386/IO-APIC.txt>,
209 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
210 <http://www.tldp.org/docs.html#howto>.
212 If you don't know what to do here, say N.
215 prompt "Subarchitecture Type"
221 Choose this option if your computer is a standard PC or compatible.
227 Select this for an AMD Elan processor.
229 Do not use this option for K6/Athlon/Opteron processors!
231 If unsure, choose "PC-compatible" instead.
236 select SMP if !BROKEN
238 Voyager is an MCA-based 32-way capable SMP architecture proprietary
239 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
243 If you do not specifically know you have a Voyager based machine,
244 say N here, otherwise the kernel you build will not be bootable.
247 bool "NUMAQ (IBM/Sequent)"
252 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
253 multiquad box. This changes the way that processors are bootstrapped,
254 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
255 You will need a new lynxer.elf file to flash your firmware with - send
256 email to <Martin.Bligh@us.ibm.com>.
259 bool "Summit/EXA (IBM x440)"
260 depends on X86_32 && SMP
262 This option is needed for IBM systems that use the Summit/EXA chipset.
263 In particular, it is needed for the x440.
265 If you don't have one of these computers, you should say N here.
266 If you want to build a NUMA kernel, you must select ACPI.
269 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
270 depends on X86_32 && SMP
272 This option is needed for the systems that have more than 8 CPUs
273 and if the system is not of any sub-arch type above.
275 If you don't have such a system, you should say N here.
278 bool "SGI 320/540 (Visual Workstation)"
281 The SGI Visual Workstation series is an IA32-based workstation
282 based on SGI systems chips with some legacy PC hardware attached.
284 Say Y here to create a kernel to run on the SGI 320 or 540.
286 A kernel compiled for the Visual Workstation will not run on PCs
287 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
289 config X86_GENERICARCH
290 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
293 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
294 It is intended for a generic binary kernel.
295 If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
298 bool "Support for Unisys ES7000 IA32 series"
299 depends on X86_32 && SMP
301 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
302 supposed to run on an IA32-based Unisys ES7000 system.
303 Only choose this option if you have such a system, otherwise you
307 bool "RDC R-321x SoC"
310 select X86_REBOOTFIXUPS
315 This option is needed for RDC R-321x system-on-chip, also known
317 If you don't have one of these chips, you should say N here.
320 bool "Support for ScaleMP vSMP"
321 depends on X86_64 && PCI
323 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
324 supposed to run on these EM64T-based machines. Only choose this option
325 if you have one of these machines.
329 config SCHED_NO_NO_OMIT_FRAME_POINTER
331 prompt "Single-depth WCHAN output"
334 Calculate simpler /proc/<PID>/wchan values. If this option
335 is disabled then wchan values will recurse back to the
336 caller function. This provides more accurate wchan values,
337 at the expense of slightly more scheduling overhead.
339 If in doubt, say "Y".
341 menuconfig PARAVIRT_GUEST
342 bool "Paravirtualized guest support"
344 Say Y here to get to see options related to running Linux under
345 various hypervisors. This option alone does not add any kernel code.
347 If you say N, all options in this submenu will be skipped and disabled.
351 source "arch/x86/xen/Kconfig"
354 bool "VMI Guest support"
357 depends on !(X86_VISWS || X86_VOYAGER)
359 VMI provides a paravirtualized interface to the VMware ESX server
360 (it could be used by other hypervisors in theory too, but is not
361 at the moment), by linking the kernel to a GPL-ed ROM module
362 provided by the hypervisor.
364 source "arch/x86/lguest/Kconfig"
367 bool "Enable paravirtualization code"
368 depends on !(X86_VISWS || X86_VOYAGER)
370 This changes the kernel so it can modify itself when it is run
371 under a hypervisor, potentially improving performance significantly
372 over full virtualization. However, when run without a hypervisor
373 the kernel is theoretically slower and slightly larger.
379 depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
382 config HAVE_ARCH_PARSE_SRAT
386 config X86_SUMMIT_NUMA
388 depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)
390 config X86_CYCLONE_TIMER
392 depends on X86_32 && X86_SUMMIT || X86_GENERICARCH
394 config ES7000_CLUSTERED_APIC
396 depends on SMP && X86_ES7000 && MPENTIUMIII
398 source "arch/x86/Kconfig.cpu"
402 prompt "HPET Timer Support" if X86_32
404 Use the IA-PC HPET (High Precision Event Timer) to manage
405 time in preference to the PIT and RTC, if a HPET is
407 HPET is the next generation timer replacing legacy 8254s.
408 The HPET provides a stable time base on SMP
409 systems, unlike the TSC, but it is more expensive to access,
410 as it is off-chip. You can find the HPET spec at
411 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
413 You can safely choose Y here. However, HPET will only be
414 activated if the platform and the BIOS support this feature.
415 Otherwise the 8254 will be used for timing services.
417 Choose N to continue using the legacy 8254 timer.
419 config HPET_EMULATE_RTC
421 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
423 # Mark as embedded because too many people got it wrong.
424 # The code disables itself when not needed.
426 bool "GART IOMMU support" if EMBEDDED
430 depends on X86_64 && PCI
432 Support for full DMA access of devices with 32bit memory access only
433 on systems with more than 3GB. This is usually needed for USB,
434 sound, many IDE/SATA chipsets and some other devices.
435 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
436 based hardware IOMMU and a software bounce buffer based IOMMU used
437 on Intel systems and as fallback.
438 The code is only active when needed (enough memory and limited
439 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
443 bool "IBM Calgary IOMMU support"
445 depends on X86_64 && PCI && EXPERIMENTAL
447 Support for hardware IOMMUs in IBM's xSeries x366 and x460
448 systems. Needed to run systems with more than 3GB of memory
449 properly with 32-bit PCI devices that do not support DAC
450 (Double Address Cycle). Calgary also supports bus level
451 isolation, where all DMAs pass through the IOMMU. This
452 prevents them from going anywhere except their intended
453 destination. This catches hard-to-find kernel bugs and
454 mis-behaving drivers and devices that do not use the DMA-API
455 properly to set up their DMA buffers. The IOMMU can be
456 turned off at boot time with the iommu=off parameter.
457 Normally the kernel will make the right choice by itself.
460 config CALGARY_IOMMU_ENABLED_BY_DEFAULT
462 prompt "Should Calgary be enabled by default?"
463 depends on CALGARY_IOMMU
465 Should Calgary be enabled by default? if you choose 'y', Calgary
466 will be used (if it exists). If you choose 'n', Calgary will not be
467 used even if it exists. If you choose 'n' and would like to use
468 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
472 def_bool (CALGARY_IOMMU || GART_IOMMU)
474 # need this always selected by IOMMU for the VIA workaround
478 Support for software bounce buffers used on x86-64 systems
479 which don't have a hardware IOMMU (e.g. the current generation
480 of Intel's x86-64 CPUs). Using this PCI devices which can only
481 access 32-bits of memory can be used on systems with more than
482 3 GB of memory. If unsure, say Y.
486 int "Maximum number of CPUs (2-255)"
489 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
492 This allows you to specify the maximum number of CPUs which this
493 kernel will support. The maximum supported value is 255 and the
494 minimum value which makes sense is 2.
496 This is purely to save memory - each supported CPU adds
497 approximately eight kilobytes to the kernel image.
500 bool "SMT (Hyperthreading) scheduler support"
501 depends on (X86_64 && SMP) || (X86_32 && X86_HT)
503 SMT scheduler support improves the CPU scheduler's decision making
504 when dealing with Intel Pentium 4 chips with HyperThreading at a
505 cost of slightly increased overhead in some places. If unsure say
510 prompt "Multi-core scheduler support"
511 depends on (X86_64 && SMP) || (X86_32 && X86_HT)
513 Multi-core scheduler support improves the CPU scheduler's decision
514 making when dealing with multi-core CPU chips at a cost of slightly
515 increased overhead in some places. If unsure say N here.
517 source "kernel/Kconfig.preempt"
520 bool "Local APIC support on uniprocessors"
521 depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
523 A local APIC (Advanced Programmable Interrupt Controller) is an
524 integrated interrupt controller in the CPU. If you have a single-CPU
525 system which has a processor with a local APIC, you can say Y here to
526 enable and use it. If you say Y here even though your machine doesn't
527 have a local APIC, then the kernel will still run with no slowdown at
528 all. The local APIC supports CPU-generated self-interrupts (timer,
529 performance counters), and the NMI watchdog which detects hard
533 bool "IO-APIC support on uniprocessors"
534 depends on X86_UP_APIC
536 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
537 SMP-capable replacement for PC-style interrupt controllers. Most
538 SMP systems and many recent uniprocessor systems have one.
540 If you have a single-CPU system with an IO-APIC, you can say Y here
541 to use it. If you say Y here even though your machine doesn't have
542 an IO-APIC, then the kernel will still run with no slowdown at all.
544 config X86_LOCAL_APIC
546 depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))
550 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))
552 config X86_VISWS_APIC
554 depends on X86_32 && X86_VISWS
557 bool "Machine Check Exception"
558 depends on !X86_VOYAGER
560 Machine Check Exception support allows the processor to notify the
561 kernel if it detects a problem (e.g. overheating, component failure).
562 The action the kernel takes depends on the severity of the problem,
563 ranging from a warning message on the console, to halting the machine.
564 Your processor must be a Pentium or newer to support this - check the
565 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
566 have a design flaw which leads to false MCE events - hence MCE is
567 disabled on all P5 processors, unless explicitly enabled with "mce"
568 as a boot argument. Similarly, if MCE is built in and creates a
569 problem on some new non-standard machine, you can boot with "nomce"
570 to disable it. MCE support simply ignores non-MCE processors like
571 the 386 and 486, so nearly everyone can say Y here.
575 prompt "Intel MCE features"
576 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
578 Additional support for intel specific MCE features such as
583 prompt "AMD MCE features"
584 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
586 Additional support for AMD specific MCE features such as
587 the DRAM Error Threshold.
589 config X86_MCE_NONFATAL
590 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
591 depends on X86_32 && X86_MCE
593 Enabling this feature starts a timer that triggers every 5 seconds which
594 will look at the machine check registers to see if anything happened.
595 Non-fatal problems automatically get corrected (but still logged).
596 Disable this if you don't want to see these messages.
597 Seeing the messages this option prints out may be indicative of dying
598 or out-of-spec (ie, overclocked) hardware.
599 This option only does something on certain CPUs.
600 (AMD Athlon/Duron and Intel Pentium 4)
602 config X86_MCE_P4THERMAL
603 bool "check for P4 thermal throttling interrupt."
604 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
606 Enabling this feature will cause a message to be printed when the P4
607 enters thermal throttling.
610 bool "Enable VM86 support" if EMBEDDED
614 This option is required by programs like DOSEMU to run 16-bit legacy
615 code on X86 processors. It also may be needed by software like
616 XFree86 to initialize some video cards via BIOS. Disabling this
617 option saves about 6k.
620 tristate "Toshiba Laptop support"
623 This adds a driver to safely access the System Management Mode of
624 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
625 not work on models with a Phoenix BIOS. The System Management Mode
626 is used to set the BIOS and power saving options on Toshiba portables.
628 For information on utilities to make use of this driver see the
629 Toshiba Linux utilities web site at:
630 <http://www.buzzard.org.uk/toshiba/>.
632 Say Y if you intend to run this kernel on a Toshiba portable.
636 tristate "Dell laptop support"
638 This adds a driver to safely access the System Management Mode
639 of the CPU on the Dell Inspiron 8000. The System Management Mode
640 is used to read cpu temperature and cooling fan status and to
641 control the fans on the I8K portables.
643 This driver has been tested only on the Inspiron 8000 but it may
644 also work with other Dell laptops. You can force loading on other
645 models by passing the parameter `force=1' to the module. Use at
648 For information on utilities to make use of this driver see the
649 I8K Linux utilities web site at:
650 <http://people.debian.org/~dz/i8k/>
652 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
655 config X86_REBOOTFIXUPS
657 prompt "Enable X86 board specific fixups for reboot"
658 depends on X86_32 && X86
660 This enables chipset and/or board specific fixups to be done
661 in order to get reboot to work correctly. This is only needed on
662 some combinations of hardware and BIOS. The symptom, for which
663 this config is intended, is when reboot ends with a stalled/hung
666 Currently, the only fixup is for the Geode machines using
667 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
669 Say Y if you want to enable the fixup. Currently, it's safe to
670 enable this option even if you don't need it.
674 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
677 If you say Y here, you will be able to update the microcode on
678 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
679 Pentium III, Pentium 4, Xeon etc. You will obviously need the
680 actual microcode binary data itself which is not shipped with the
683 For latest news and information on obtaining all the required
684 ingredients for this driver, check:
685 <http://www.urbanmyth.org/microcode/>.
687 To compile this driver as a module, choose M here: the
688 module will be called microcode.
690 config MICROCODE_OLD_INTERFACE
695 tristate "/dev/cpu/*/msr - Model-specific register support"
697 This device gives privileged processes access to the x86
698 Model-Specific Registers (MSRs). It is a character device with
699 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
700 MSR accesses are directed to a specific CPU on multi-processor
704 tristate "/dev/cpu/*/cpuid - CPU information support"
706 This device gives processes access to the x86 CPUID instruction to
707 be executed on a specific processor. It is a character device
708 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
712 prompt "High Memory Support"
713 default HIGHMEM4G if !X86_NUMAQ
714 default HIGHMEM64G if X86_NUMAQ
719 depends on !X86_NUMAQ
721 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
722 However, the address space of 32-bit x86 processors is only 4
723 Gigabytes large. That means that, if you have a large amount of
724 physical memory, not all of it can be "permanently mapped" by the
725 kernel. The physical memory that's not permanently mapped is called
728 If you are compiling a kernel which will never run on a machine with
729 more than 1 Gigabyte total physical RAM, answer "off" here (default
730 choice and suitable for most users). This will result in a "3GB/1GB"
731 split: 3GB are mapped so that each process sees a 3GB virtual memory
732 space and the remaining part of the 4GB virtual memory space is used
733 by the kernel to permanently map as much physical memory as
736 If the machine has between 1 and 4 Gigabytes physical RAM, then
739 If more than 4 Gigabytes is used then answer "64GB" here. This
740 selection turns Intel PAE (Physical Address Extension) mode on.
741 PAE implements 3-level paging on IA32 processors. PAE is fully
742 supported by Linux, PAE mode is implemented on all recent Intel
743 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
744 then the kernel will not boot on CPUs that don't support PAE!
746 The actual amount of total physical memory will either be
747 auto detected or can be forced by using a kernel command line option
748 such as "mem=256M". (Try "man bootparam" or see the documentation of
749 your boot loader (lilo or loadlin) about how to pass options to the
750 kernel at boot time.)
752 If unsure, say "off".
756 depends on !X86_NUMAQ
758 Select this if you have a 32-bit processor and between 1 and 4
759 gigabytes of physical RAM.
763 depends on !M386 && !M486
766 Select this if you have a 32-bit processor and more than 4
767 gigabytes of physical RAM.
772 depends on EXPERIMENTAL
773 prompt "Memory split" if EMBEDDED
777 Select the desired split between kernel and user memory.
779 If the address range available to the kernel is less than the
780 physical memory installed, the remaining memory will be available
781 as "high memory". Accessing high memory is a little more costly
782 than low memory, as it needs to be mapped into the kernel first.
783 Note that increasing the kernel address space limits the range
784 available to user programs, making the address space there
785 tighter. Selecting anything other than the default 3G/1G split
786 will also likely make your kernel incompatible with binary-only
789 If you are not absolutely sure what you are doing, leave this
793 bool "3G/1G user/kernel split"
794 config VMSPLIT_3G_OPT
796 bool "3G/1G user/kernel split (for full 1G low memory)"
798 bool "2G/2G user/kernel split"
799 config VMSPLIT_2G_OPT
801 bool "2G/2G user/kernel split (for full 2G low memory)"
803 bool "1G/3G user/kernel split"
808 default 0xB0000000 if VMSPLIT_3G_OPT
809 default 0x80000000 if VMSPLIT_2G
810 default 0x78000000 if VMSPLIT_2G_OPT
811 default 0x40000000 if VMSPLIT_1G
817 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
821 prompt "PAE (Physical Address Extension) Support"
822 depends on X86_32 && !HIGHMEM4G
823 select RESOURCES_64BIT
825 PAE is required for NX support, and furthermore enables
826 larger swapspace support for non-overcommit purposes. It
827 has the cost of more pagetable lookup overhead, and also
828 consumes more pagetable space per process.
830 # Common NUMA Features
832 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
834 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
836 default y if (X86_NUMAQ || X86_SUMMIT)
838 Enable NUMA (Non Uniform Memory Access) support.
839 The kernel will try to allocate memory used by a CPU on the
840 local memory controller of the CPU and add some more
841 NUMA awareness to the kernel.
843 For i386 this is currently highly experimental and should be only
844 used for kernel development. It might also cause boot failures.
845 For x86_64 this is recommended on all multiprocessor Opteron systems.
846 If the system is EM64T, you should say N unless your system is
849 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
850 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
854 prompt "Old style AMD Opteron NUMA detection"
855 depends on X86_64 && NUMA && PCI
857 Enable K8 NUMA node topology detection. You should say Y here if
858 you have a multi processor AMD K8 system. This uses an old
859 method to read the NUMA configuration directly from the builtin
860 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
861 instead, which also takes priority if both are compiled in.
863 config X86_64_ACPI_NUMA
865 prompt "ACPI NUMA detection"
866 depends on X86_64 && NUMA && ACPI && PCI
869 Enable ACPI SRAT based node topology detection.
872 bool "NUMA emulation"
873 depends on X86_64 && NUMA
875 Enable NUMA emulation. A flat machine will be split
876 into virtual nodes when booted with "numa=fake=N", where N is the
877 number of nodes. This is only useful for debugging.
882 default "6" if X86_64
883 default "4" if X86_NUMAQ
885 depends on NEED_MULTIPLE_NODES
887 config HAVE_ARCH_BOOTMEM_NODE
889 depends on X86_32 && NUMA
891 config ARCH_HAVE_MEMORY_PRESENT
893 depends on X86_32 && DISCONTIGMEM
895 config NEED_NODE_MEMMAP_SIZE
897 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
899 config HAVE_ARCH_ALLOC_REMAP
901 depends on X86_32 && NUMA
903 config ARCH_FLATMEM_ENABLE
905 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
907 config ARCH_DISCONTIGMEM_ENABLE
909 depends on NUMA && X86_32
911 config ARCH_DISCONTIGMEM_DEFAULT
913 depends on NUMA && X86_32
915 config ARCH_SPARSEMEM_DEFAULT
919 config ARCH_SPARSEMEM_ENABLE
921 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
922 select SPARSEMEM_STATIC if X86_32
923 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
925 config ARCH_SELECT_MEMORY_MODEL
927 depends on ARCH_SPARSEMEM_ENABLE
929 config ARCH_MEMORY_PROBE
931 depends on MEMORY_HOTPLUG
936 bool "Allocate 3rd-level pagetables from highmem"
937 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
939 The VM uses one page table entry for each page of physical memory.
940 For systems with a lot of RAM, this can be wasteful of precious
941 low memory. Setting this option will put user-space page table
942 entries in high memory.
944 config MATH_EMULATION
946 prompt "Math emulation" if X86_32
948 Linux can emulate a math coprocessor (used for floating point
949 operations) if you don't have one. 486DX and Pentium processors have
950 a math coprocessor built in, 486SX and 386 do not, unless you added
951 a 487DX or 387, respectively. (The messages during boot time can
952 give you some hints here ["man dmesg"].) Everyone needs either a
953 coprocessor or this emulation.
955 If you don't have a math coprocessor, you need to say Y here; if you
956 say Y here even though you have a coprocessor, the coprocessor will
957 be used nevertheless. (This behavior can be changed with the kernel
958 command line option "no387", which comes handy if your coprocessor
959 is broken. Try "man bootparam" or see the documentation of your boot
960 loader (lilo or loadlin) about how to pass options to the kernel at
961 boot time.) This means that it is a good idea to say Y here if you
962 intend to use this kernel on different machines.
964 More information about the internals of the Linux math coprocessor
965 emulation can be found in <file:arch/x86/math-emu/README>.
967 If you are not sure, say Y; apart from resulting in a 66 KB bigger
968 kernel, it won't hurt.
971 bool "MTRR (Memory Type Range Register) support"
973 On Intel P6 family processors (Pentium Pro, Pentium II and later)
974 the Memory Type Range Registers (MTRRs) may be used to control
975 processor access to memory ranges. This is most useful if you have
976 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
977 allows bus write transfers to be combined into a larger transfer
978 before bursting over the PCI/AGP bus. This can increase performance
979 of image write operations 2.5 times or more. Saying Y here creates a
980 /proc/mtrr file which may be used to manipulate your processor's
981 MTRRs. Typically the X server should use this.
983 This code has a reasonably generic interface so that similar
984 control registers on other processors can be easily supported
987 The Cyrix 6x86, 6x86MX and M II processors have Address Range
988 Registers (ARRs) which provide a similar functionality to MTRRs. For
989 these, the ARRs are used to emulate the MTRRs.
990 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
991 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
992 write-combining. All of these processors are supported by this code
993 and it makes sense to say Y here if you have one of them.
995 Saying Y here also fixes a problem with buggy SMP BIOSes which only
996 set the MTRRs for the boot CPU and not for the secondary CPUs. This
997 can lead to all sorts of problems, so it's good to say Y here.
999 You can safely say Y even if your machine doesn't have MTRRs, you'll
1000 just add about 9 KB to your kernel.
1002 See <file:Documentation/mtrr.txt> for more information.
1006 prompt "EFI runtime service support"
1009 This enables the kernel to use EFI runtime services that are
1010 available (such as the EFI variable services).
1012 This option is only useful on systems that have EFI firmware.
1013 In addition, you should use the latest ELILO loader available
1014 at <http://elilo.sourceforge.net> in order to take advantage
1015 of EFI runtime services. However, even with this option, the
1016 resultant kernel should continue to boot on existing non-EFI
1021 prompt "Enable kernel irq balancing"
1022 depends on X86_32 && SMP && X86_IO_APIC
1024 The default yes will allow the kernel to do irq load balancing.
1025 Saying no will keep the kernel from doing irq load balancing.
1029 prompt "Enable seccomp to safely compute untrusted bytecode"
1032 This kernel feature is useful for number crunching applications
1033 that may need to compute untrusted bytecode during their
1034 execution. By using pipes or other transports made available to
1035 the process as file descriptors supporting the read/write
1036 syscalls, it's possible to isolate those applications in
1037 their own address space using seccomp. Once seccomp is
1038 enabled via /proc/<pid>/seccomp, it cannot be disabled
1039 and the task is only allowed to execute a few safe syscalls
1040 defined by each seccomp mode.
1042 If unsure, say Y. Only embedded should say N here.
1044 config CC_STACKPROTECTOR
1045 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1046 depends on X86_64 && EXPERIMENTAL
1048 This option turns on the -fstack-protector GCC feature. This
1049 feature puts, at the beginning of critical functions, a canary
1050 value on the stack just before the return address, and validates
1051 the value just before actually returning. Stack based buffer
1052 overflows (that need to overwrite this return address) now also
1053 overwrite the canary, which gets detected and the attack is then
1054 neutralized via a kernel panic.
1056 This feature requires gcc version 4.2 or above, or a distribution
1057 gcc with the feature backported. Older versions are automatically
1058 detected and for those versions, this configuration option is ignored.
1060 config CC_STACKPROTECTOR_ALL
1061 bool "Use stack-protector for all functions"
1062 depends on CC_STACKPROTECTOR
1064 Normally, GCC only inserts the canary value protection for
1065 functions that use large-ish on-stack buffers. By enabling
1066 this option, GCC will be asked to do this for ALL functions.
1068 source kernel/Kconfig.hz
1071 bool "kexec system call"
1073 kexec is a system call that implements the ability to shutdown your
1074 current kernel, and to start another kernel. It is like a reboot
1075 but it is independent of the system firmware. And like a reboot
1076 you can start any kernel with it, not just Linux.
1078 The name comes from the similarity to the exec system call.
1080 It is an ongoing process to be certain the hardware in a machine
1081 is properly shutdown, so do not be surprised if this code does not
1082 initially work for you. It may help to enable device hotplugging
1083 support. As of this writing the exact hardware interface is
1084 strongly in flux, so no good recommendation can be made.
1087 bool "kernel crash dumps (EXPERIMENTAL)"
1088 depends on EXPERIMENTAL
1089 depends on X86_64 || (X86_32 && HIGHMEM)
1091 Generate crash dump after being started by kexec.
1092 This should be normally only set in special crash dump kernels
1093 which are loaded in the main kernel with kexec-tools into
1094 a specially reserved region and then later executed after
1095 a crash by kdump/kexec. The crash dump kernel must be compiled
1096 to a memory address not used by the main kernel or BIOS using
1097 PHYSICAL_START, or it must be built as a relocatable image
1098 (CONFIG_RELOCATABLE=y).
1099 For more details see Documentation/kdump/kdump.txt
1101 config PHYSICAL_START
1102 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1103 default "0x1000000" if X86_NUMAQ
1104 default "0x200000" if X86_64
1107 This gives the physical address where the kernel is loaded.
1109 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1110 bzImage will decompress itself to above physical address and
1111 run from there. Otherwise, bzImage will run from the address where
1112 it has been loaded by the boot loader and will ignore above physical
1115 In normal kdump cases one does not have to set/change this option
1116 as now bzImage can be compiled as a completely relocatable image
1117 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1118 address. This option is mainly useful for the folks who don't want
1119 to use a bzImage for capturing the crash dump and want to use a
1120 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1121 to be specifically compiled to run from a specific memory area
1122 (normally a reserved region) and this option comes handy.
1124 So if you are using bzImage for capturing the crash dump, leave
1125 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1126 Otherwise if you plan to use vmlinux for capturing the crash dump
1127 change this value to start of the reserved region (Typically 16MB
1128 0x1000000). In other words, it can be set based on the "X" value as
1129 specified in the "crashkernel=YM@XM" command line boot parameter
1130 passed to the panic-ed kernel. Typically this parameter is set as
1131 crashkernel=64M@16M. Please take a look at
1132 Documentation/kdump/kdump.txt for more details about crash dumps.
1134 Usage of bzImage for capturing the crash dump is recommended as
1135 one does not have to build two kernels. Same kernel can be used
1136 as production kernel and capture kernel. Above option should have
1137 gone away after relocatable bzImage support is introduced. But it
1138 is present because there are users out there who continue to use
1139 vmlinux for dump capture. This option should go away down the
1142 Don't change this unless you know what you are doing.
1145 bool "Build a relocatable kernel (EXPERIMENTAL)"
1146 depends on EXPERIMENTAL
1148 This builds a kernel image that retains relocation information
1149 so it can be loaded someplace besides the default 1MB.
1150 The relocations tend to make the kernel binary about 10% larger,
1151 but are discarded at runtime.
1153 One use is for the kexec on panic case where the recovery kernel
1154 must live at a different physical address than the primary
1157 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1158 it has been loaded at and the compile time physical address
1159 (CONFIG_PHYSICAL_START) is ignored.
1161 config PHYSICAL_ALIGN
1163 prompt "Alignment value to which kernel should be aligned" if X86_32
1164 default "0x100000" if X86_32
1165 default "0x200000" if X86_64
1166 range 0x2000 0x400000
1168 This value puts the alignment restrictions on physical address
1169 where kernel is loaded and run from. Kernel is compiled for an
1170 address which meets above alignment restriction.
1172 If bootloader loads the kernel at a non-aligned address and
1173 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1174 address aligned to above value and run from there.
1176 If bootloader loads the kernel at a non-aligned address and
1177 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1178 load address and decompress itself to the address it has been
1179 compiled for and run from there. The address for which kernel is
1180 compiled already meets above alignment restrictions. Hence the
1181 end result is that kernel runs from a physical address meeting
1182 above alignment restrictions.
1184 Don't change this unless you know what you are doing.
1187 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1188 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1190 Say Y here to experiment with turning CPUs off and on, and to
1191 enable suspend on SMP systems. CPUs can be controlled through
1192 /sys/devices/system/cpu.
1193 Say N if you want to disable CPU hotplug and don't need to
1198 prompt "Compat VDSO support"
1199 depends on X86_32 || IA32_EMULATION
1201 Map the 32-bit VDSO to the predictable old-style address too.
1203 Say N here if you are running a sufficiently recent glibc
1204 version (2.3.3 or later), to remove the high-mapped
1205 VDSO mapping and to exclusively use the randomized VDSO.
1211 config ARCH_ENABLE_MEMORY_HOTPLUG
1213 depends on X86_64 || (X86_32 && HIGHMEM)
1215 config HAVE_ARCH_EARLY_PFN_TO_NID
1219 menu "Power management options"
1220 depends on !X86_VOYAGER
1222 config ARCH_HIBERNATION_HEADER
1224 depends on X86_64 && HIBERNATION
1226 source "kernel/power/Kconfig"
1228 source "drivers/acpi/Kconfig"
1233 depends on APM || APM_MODULE
1236 tristate "APM (Advanced Power Management) BIOS support"
1237 depends on X86_32 && PM_SLEEP && !X86_VISWS
1239 APM is a BIOS specification for saving power using several different
1240 techniques. This is mostly useful for battery powered laptops with
1241 APM compliant BIOSes. If you say Y here, the system time will be
1242 reset after a RESUME operation, the /proc/apm device will provide
1243 battery status information, and user-space programs will receive
1244 notification of APM "events" (e.g. battery status change).
1246 If you select "Y" here, you can disable actual use of the APM
1247 BIOS by passing the "apm=off" option to the kernel at boot time.
1249 Note that the APM support is almost completely disabled for
1250 machines with more than one CPU.
1252 In order to use APM, you will need supporting software. For location
1253 and more information, read <file:Documentation/pm.txt> and the
1254 Battery Powered Linux mini-HOWTO, available from
1255 <http://www.tldp.org/docs.html#howto>.
1257 This driver does not spin down disk drives (see the hdparm(8)
1258 manpage ("man 8 hdparm") for that), and it doesn't turn off
1259 VESA-compliant "green" monitors.
1261 This driver does not support the TI 4000M TravelMate and the ACER
1262 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1263 desktop machines also don't have compliant BIOSes, and this driver
1264 may cause those machines to panic during the boot phase.
1266 Generally, if you don't have a battery in your machine, there isn't
1267 much point in using this driver and you should say N. If you get
1268 random kernel OOPSes or reboots that don't seem to be related to
1269 anything, try disabling/enabling this option (or disabling/enabling
1272 Some other things you should try when experiencing seemingly random,
1275 1) make sure that you have enough swap space and that it is
1277 2) pass the "no-hlt" option to the kernel
1278 3) switch on floating point emulation in the kernel and pass
1279 the "no387" option to the kernel
1280 4) pass the "floppy=nodma" option to the kernel
1281 5) pass the "mem=4M" option to the kernel (thereby disabling
1282 all but the first 4 MB of RAM)
1283 6) make sure that the CPU is not over clocked.
1284 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1285 8) disable the cache from your BIOS settings
1286 9) install a fan for the video card or exchange video RAM
1287 10) install a better fan for the CPU
1288 11) exchange RAM chips
1289 12) exchange the motherboard.
1291 To compile this driver as a module, choose M here: the
1292 module will be called apm.
1296 config APM_IGNORE_USER_SUSPEND
1297 bool "Ignore USER SUSPEND"
1299 This option will ignore USER SUSPEND requests. On machines with a
1300 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1301 series notebooks, it is necessary to say Y because of a BIOS bug.
1303 config APM_DO_ENABLE
1304 bool "Enable PM at boot time"
1306 Enable APM features at boot time. From page 36 of the APM BIOS
1307 specification: "When disabled, the APM BIOS does not automatically
1308 power manage devices, enter the Standby State, enter the Suspend
1309 State, or take power saving steps in response to CPU Idle calls."
1310 This driver will make CPU Idle calls when Linux is idle (unless this
1311 feature is turned off -- see "Do CPU IDLE calls", below). This
1312 should always save battery power, but more complicated APM features
1313 will be dependent on your BIOS implementation. You may need to turn
1314 this option off if your computer hangs at boot time when using APM
1315 support, or if it beeps continuously instead of suspending. Turn
1316 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1317 T400CDT. This is off by default since most machines do fine without
1321 bool "Make CPU Idle calls when idle"
1323 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1324 On some machines, this can activate improved power savings, such as
1325 a slowed CPU clock rate, when the machine is idle. These idle calls
1326 are made after the idle loop has run for some length of time (e.g.,
1327 333 mS). On some machines, this will cause a hang at boot time or
1328 whenever the CPU becomes idle. (On machines with more than one CPU,
1329 this option does nothing.)
1331 config APM_DISPLAY_BLANK
1332 bool "Enable console blanking using APM"
1334 Enable console blanking using the APM. Some laptops can use this to
1335 turn off the LCD backlight when the screen blanker of the Linux
1336 virtual console blanks the screen. Note that this is only used by
1337 the virtual console screen blanker, and won't turn off the backlight
1338 when using the X Window system. This also doesn't have anything to
1339 do with your VESA-compliant power-saving monitor. Further, this
1340 option doesn't work for all laptops -- it might not turn off your
1341 backlight at all, or it might print a lot of errors to the console,
1342 especially if you are using gpm.
1344 config APM_ALLOW_INTS
1345 bool "Allow interrupts during APM BIOS calls"
1347 Normally we disable external interrupts while we are making calls to
1348 the APM BIOS as a measure to lessen the effects of a badly behaving
1349 BIOS implementation. The BIOS should reenable interrupts if it
1350 needs to. Unfortunately, some BIOSes do not -- especially those in
1351 many of the newer IBM Thinkpads. If you experience hangs when you
1352 suspend, try setting this to Y. Otherwise, say N.
1354 config APM_REAL_MODE_POWER_OFF
1355 bool "Use real mode APM BIOS call to power off"
1357 Use real mode APM BIOS calls to switch off the computer. This is
1358 a work-around for a number of buggy BIOSes. Switch this option on if
1359 your computer crashes instead of powering off properly.
1363 source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1365 source "drivers/cpuidle/Kconfig"
1370 menu "Bus options (PCI etc.)"
1373 bool "PCI support" if !X86_VISWS
1374 depends on !X86_VOYAGER
1376 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1378 Find out whether you have a PCI motherboard. PCI is the name of a
1379 bus system, i.e. the way the CPU talks to the other stuff inside
1380 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1381 VESA. If you have PCI, say Y, otherwise N.
1384 prompt "PCI access mode"
1385 depends on X86_32 && PCI && !X86_VISWS
1388 On PCI systems, the BIOS can be used to detect the PCI devices and
1389 determine their configuration. However, some old PCI motherboards
1390 have BIOS bugs and may crash if this is done. Also, some embedded
1391 PCI-based systems don't have any BIOS at all. Linux can also try to
1392 detect the PCI hardware directly without using the BIOS.
1394 With this option, you can specify how Linux should detect the
1395 PCI devices. If you choose "BIOS", the BIOS will be used,
1396 if you choose "Direct", the BIOS won't be used, and if you
1397 choose "MMConfig", then PCI Express MMCONFIG will be used.
1398 If you choose "Any", the kernel will try MMCONFIG, then the
1399 direct access method and falls back to the BIOS if that doesn't
1400 work. If unsure, go with the default, which is "Any".
1405 config PCI_GOMMCONFIG
1418 depends on X86_32 && !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1420 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1423 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
1427 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
1434 bool "Support mmconfig PCI config space access"
1435 depends on X86_64 && PCI && ACPI
1438 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1439 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1441 DMA remapping (DMAR) devices support enables independent address
1442 translations for Direct Memory Access (DMA) from devices.
1443 These DMA remapping devices are reported via ACPI tables
1444 and include PCI device scope covered by these DMA
1449 prompt "Support for Graphics workaround"
1452 Current Graphics drivers tend to use physical address
1453 for DMA and avoid using DMA APIs. Setting this config
1454 option permits the IOMMU driver to set a unity map for
1455 all the OS-visible memory. Hence the driver can continue
1456 to use physical addresses for DMA.
1458 config DMAR_FLOPPY_WA
1462 Floppy disk drivers are know to bypass DMA API calls
1463 thereby failing to work when IOMMU is enabled. This
1464 workaround will setup a 1:1 mapping for the first
1465 16M to make floppy (an ISA device) work.
1467 source "drivers/pci/pcie/Kconfig"
1469 source "drivers/pci/Kconfig"
1471 # x86_64 have no ISA slots, but do have ISA-style DMA.
1479 depends on !(X86_VOYAGER || X86_VISWS)
1481 Find out whether you have ISA slots on your motherboard. ISA is the
1482 name of a bus system, i.e. the way the CPU talks to the other stuff
1483 inside your box. Other bus systems are PCI, EISA, MicroChannel
1484 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1485 newer boards don't support it. If you have ISA, say Y, otherwise N.
1491 The Extended Industry Standard Architecture (EISA) bus was
1492 developed as an open alternative to the IBM MicroChannel bus.
1494 The EISA bus provided some of the features of the IBM MicroChannel
1495 bus while maintaining backward compatibility with cards made for
1496 the older ISA bus. The EISA bus saw limited use between 1988 and
1497 1995 when it was made obsolete by the PCI bus.
1499 Say Y here if you are building a kernel for an EISA-based machine.
1503 source "drivers/eisa/Kconfig"
1506 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1507 default y if X86_VOYAGER
1509 MicroChannel Architecture is found in some IBM PS/2 machines and
1510 laptops. It is a bus system similar to PCI or ISA. See
1511 <file:Documentation/mca.txt> (and especially the web page given
1512 there) before attempting to build an MCA bus kernel.
1514 source "drivers/mca/Kconfig"
1517 tristate "NatSemi SCx200 support"
1518 depends on !X86_VOYAGER
1520 This provides basic support for National Semiconductor's
1521 (now AMD's) Geode processors. The driver probes for the
1522 PCI-IDs of several on-chip devices, so its a good dependency
1523 for other scx200_* drivers.
1525 If compiled as a module, the driver is named scx200.
1527 config SCx200HR_TIMER
1528 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1529 depends on SCx200 && GENERIC_TIME
1532 This driver provides a clocksource built upon the on-chip
1533 27MHz high-resolution timer. Its also a workaround for
1534 NSC Geode SC-1100's buggy TSC, which loses time when the
1535 processor goes idle (as is done by the scheduler). The
1536 other workaround is idle=poll boot option.
1538 config GEODE_MFGPT_TIMER
1540 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
1541 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
1543 This driver provides a clock event source based on the MFGPT
1544 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1545 MFGPTs have a better resolution and max interval than the
1546 generic PIT, and are suitable for use as high-res timers.
1552 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
1554 source "drivers/pcmcia/Kconfig"
1556 source "drivers/pci/hotplug/Kconfig"
1561 menu "Executable file formats / Emulations"
1563 source "fs/Kconfig.binfmt"
1565 config IA32_EMULATION
1566 bool "IA32 Emulation"
1568 select COMPAT_BINFMT_ELF
1570 Include code to run 32-bit programs under a 64-bit kernel. You should
1571 likely turn this on, unless you're 100% sure that you don't have any
1572 32-bit programs left.
1575 tristate "IA32 a.out support"
1576 depends on IA32_EMULATION
1578 Support old a.out binaries in the 32bit emulation.
1582 depends on IA32_EMULATION
1584 config COMPAT_FOR_U64_ALIGNMENT
1588 config SYSVIPC_COMPAT
1590 depends on X86_64 && COMPAT && SYSVIPC
1595 source "net/Kconfig"
1597 source "drivers/Kconfig"
1599 source "drivers/firmware/Kconfig"
1603 source "arch/x86/Kconfig.debug"
1605 source "security/Kconfig"
1607 source "crypto/Kconfig"
1609 source "arch/x86/kvm/Kconfig"
1611 source "lib/Kconfig"
projects / linux-2.6 / blob