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
21 select HAVE_UNSTABLE_SCHED_CLOCK
25 select HAVE_KRETPROBES
26 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
27 select HAVE_ARCH_KGDB if !X86_VOYAGER
31 default "arch/x86/configs/i386_defconfig" if X86_32
32 default "arch/x86/configs/x86_64_defconfig" if X86_64
35 config GENERIC_LOCKBREAK
41 config GENERIC_CMOS_UPDATE
44 config CLOCKSOURCE_WATCHDOG
47 config GENERIC_CLOCKEVENTS
50 config GENERIC_CLOCKEVENTS_BROADCAST
52 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
54 config LOCKDEP_SUPPORT
57 config STACKTRACE_SUPPORT
60 config HAVE_LATENCYTOP_SUPPORT
63 config FAST_CMPXCHG_LOCAL
76 config GENERIC_ISA_DMA
86 config GENERIC_HWEIGHT
92 config ARCH_MAY_HAVE_PC_FDC
95 config RWSEM_GENERIC_SPINLOCK
98 config RWSEM_XCHGADD_ALGORITHM
101 config ARCH_HAS_ILOG2_U32
104 config ARCH_HAS_ILOG2_U64
107 config ARCH_HAS_CPU_IDLE_WAIT
110 config GENERIC_CALIBRATE_DELAY
113 config GENERIC_TIME_VSYSCALL
117 config ARCH_HAS_CPU_RELAX
120 config ARCH_HAS_CACHE_LINE_SIZE
123 config HAVE_SETUP_PER_CPU_AREA
124 def_bool X86_64 || (X86_SMP && !X86_VOYAGER)
126 config HAVE_CPUMASK_OF_CPU_MAP
129 config ARCH_HIBERNATION_POSSIBLE
131 depends on !SMP || !X86_VOYAGER
133 config ARCH_SUSPEND_POSSIBLE
135 depends on !X86_VOYAGER
141 config ARCH_POPULATES_NODE_MAP
148 config ARCH_SUPPORTS_AOUT
151 config ARCH_SUPPORTS_OPTIMIZED_INLINING
154 # Use the generic interrupt handling code in kernel/irq/:
155 config GENERIC_HARDIRQS
159 config GENERIC_IRQ_PROBE
163 config GENERIC_PENDING_IRQ
165 depends on GENERIC_HARDIRQS && SMP
170 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
175 depends on X86_32 && SMP
179 depends on X86_64 && SMP
184 depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || X86_64
187 config X86_BIOS_REBOOT
189 depends on !X86_VISWS && !X86_VOYAGER
192 config X86_TRAMPOLINE
194 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
199 source "init/Kconfig"
201 menu "Processor type and features"
203 source "kernel/time/Kconfig"
206 bool "Symmetric multi-processing support"
208 This enables support for systems with more than one CPU. If you have
209 a system with only one CPU, like most personal computers, say N. If
210 you have a system with more than one CPU, say Y.
212 If you say N here, the kernel will run on single and multiprocessor
213 machines, but will use only one CPU of a multiprocessor machine. If
214 you say Y here, the kernel will run on many, but not all,
215 singleprocessor machines. On a singleprocessor machine, the kernel
216 will run faster if you say N here.
218 Note that if you say Y here and choose architecture "586" or
219 "Pentium" under "Processor family", the kernel will not work on 486
220 architectures. Similarly, multiprocessor kernels for the "PPro"
221 architecture may not work on all Pentium based boards.
223 People using multiprocessor machines who say Y here should also say
224 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
225 Management" code will be disabled if you say Y here.
227 See also <file:Documentation/i386/IO-APIC.txt>,
228 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
229 <http://www.tldp.org/docs.html#howto>.
231 If you don't know what to do here, say N.
234 prompt "Subarchitecture Type"
240 Choose this option if your computer is a standard PC or compatible.
246 Select this for an AMD Elan processor.
248 Do not use this option for K6/Athlon/Opteron processors!
250 If unsure, choose "PC-compatible" instead.
254 depends on X86_32 && (SMP || BROKEN)
256 Voyager is an MCA-based 32-way capable SMP architecture proprietary
257 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
261 If you do not specifically know you have a Voyager based machine,
262 say N here, otherwise the kernel you build will not be bootable.
265 bool "NUMAQ (IBM/Sequent)"
266 depends on SMP && X86_32
269 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
270 multiquad box. This changes the way that processors are bootstrapped,
271 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
272 You will need a new lynxer.elf file to flash your firmware with - send
273 email to <Martin.Bligh@us.ibm.com>.
276 bool "Summit/EXA (IBM x440)"
277 depends on X86_32 && SMP
279 This option is needed for IBM systems that use the Summit/EXA chipset.
280 In particular, it is needed for the x440.
282 If you don't have one of these computers, you should say N here.
283 If you want to build a NUMA kernel, you must select ACPI.
286 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
287 depends on X86_32 && SMP
289 This option is needed for the systems that have more than 8 CPUs
290 and if the system is not of any sub-arch type above.
292 If you don't have such a system, you should say N here.
295 bool "SGI 320/540 (Visual Workstation)"
298 The SGI Visual Workstation series is an IA32-based workstation
299 based on SGI systems chips with some legacy PC hardware attached.
301 Say Y here to create a kernel to run on the SGI 320 or 540.
303 A kernel compiled for the Visual Workstation will not run on PCs
304 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
306 config X86_GENERICARCH
307 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
310 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
311 It is intended for a generic binary kernel.
312 If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
315 bool "Support for Unisys ES7000 IA32 series"
316 depends on X86_32 && SMP
318 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
319 supposed to run on an IA32-based Unisys ES7000 system.
320 Only choose this option if you have such a system, otherwise you
324 bool "RDC R-321x SoC"
327 select X86_REBOOTFIXUPS
333 This option is needed for RDC R-321x system-on-chip, also known
335 If you don't have one of these chips, you should say N here.
338 bool "Support for ScaleMP vSMP"
342 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
343 supposed to run on these EM64T-based machines. Only choose this option
344 if you have one of these machines.
348 config SCHED_NO_NO_OMIT_FRAME_POINTER
350 prompt "Single-depth WCHAN output"
353 Calculate simpler /proc/<PID>/wchan values. If this option
354 is disabled then wchan values will recurse back to the
355 caller function. This provides more accurate wchan values,
356 at the expense of slightly more scheduling overhead.
358 If in doubt, say "Y".
360 menuconfig PARAVIRT_GUEST
361 bool "Paravirtualized guest support"
363 Say Y here to get to see options related to running Linux under
364 various hypervisors. This option alone does not add any kernel code.
366 If you say N, all options in this submenu will be skipped and disabled.
370 source "arch/x86/xen/Kconfig"
373 bool "VMI Guest support"
376 depends on !(X86_VISWS || X86_VOYAGER)
378 VMI provides a paravirtualized interface to the VMware ESX server
379 (it could be used by other hypervisors in theory too, but is not
380 at the moment), by linking the kernel to a GPL-ed ROM module
381 provided by the hypervisor.
384 bool "KVM paravirtualized clock"
386 depends on !(X86_VISWS || X86_VOYAGER)
388 Turning on this option will allow you to run a paravirtualized clock
389 when running over the KVM hypervisor. Instead of relying on a PIT
390 (or probably other) emulation by the underlying device model, the host
391 provides the guest with timing infrastructure such as time of day, and
395 bool "KVM Guest support"
397 depends on !(X86_VISWS || X86_VOYAGER)
399 This option enables various optimizations for running under the KVM
402 source "arch/x86/lguest/Kconfig"
405 bool "Enable paravirtualization code"
406 depends on !(X86_VISWS || X86_VOYAGER)
408 This changes the kernel so it can modify itself when it is run
409 under a hypervisor, potentially improving performance significantly
410 over full virtualization. However, when run without a hypervisor
411 the kernel is theoretically slower and slightly larger.
420 This option adds a kernel parameter 'memtest', which allows memtest
422 memtest=0, mean disabled; -- default
423 memtest=1, mean do 1 test pattern;
425 memtest=4, mean do 4 test patterns.
426 If you are unsure how to answer this question, answer Y.
430 depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
433 config HAVE_ARCH_PARSE_SRAT
437 config X86_SUMMIT_NUMA
439 depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)
441 config X86_CYCLONE_TIMER
443 depends on X86_32 && X86_SUMMIT || X86_GENERICARCH
445 config ES7000_CLUSTERED_APIC
447 depends on SMP && X86_ES7000 && MPENTIUMIII
449 source "arch/x86/Kconfig.cpu"
453 prompt "HPET Timer Support" if X86_32
455 Use the IA-PC HPET (High Precision Event Timer) to manage
456 time in preference to the PIT and RTC, if a HPET is
458 HPET is the next generation timer replacing legacy 8254s.
459 The HPET provides a stable time base on SMP
460 systems, unlike the TSC, but it is more expensive to access,
461 as it is off-chip. You can find the HPET spec at
462 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
464 You can safely choose Y here. However, HPET will only be
465 activated if the platform and the BIOS support this feature.
466 Otherwise the 8254 will be used for timing services.
468 Choose N to continue using the legacy 8254 timer.
470 config HPET_EMULATE_RTC
472 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
474 # Mark as embedded because too many people got it wrong.
475 # The code disables itself when not needed.
478 bool "Enable DMI scanning" if EMBEDDED
480 Enabled scanning of DMI to identify machine quirks. Say Y
481 here unless you have verified that your setup is not
482 affected by entries in the DMI blacklist. Required by PNP
486 bool "GART IOMMU support" if EMBEDDED
490 depends on X86_64 && PCI
492 Support for full DMA access of devices with 32bit memory access only
493 on systems with more than 3GB. This is usually needed for USB,
494 sound, many IDE/SATA chipsets and some other devices.
495 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
496 based hardware IOMMU and a software bounce buffer based IOMMU used
497 on Intel systems and as fallback.
498 The code is only active when needed (enough memory and limited
499 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
503 bool "IBM Calgary IOMMU support"
505 depends on X86_64 && PCI && EXPERIMENTAL
507 Support for hardware IOMMUs in IBM's xSeries x366 and x460
508 systems. Needed to run systems with more than 3GB of memory
509 properly with 32-bit PCI devices that do not support DAC
510 (Double Address Cycle). Calgary also supports bus level
511 isolation, where all DMAs pass through the IOMMU. This
512 prevents them from going anywhere except their intended
513 destination. This catches hard-to-find kernel bugs and
514 mis-behaving drivers and devices that do not use the DMA-API
515 properly to set up their DMA buffers. The IOMMU can be
516 turned off at boot time with the iommu=off parameter.
517 Normally the kernel will make the right choice by itself.
520 config CALGARY_IOMMU_ENABLED_BY_DEFAULT
522 prompt "Should Calgary be enabled by default?"
523 depends on CALGARY_IOMMU
525 Should Calgary be enabled by default? if you choose 'y', Calgary
526 will be used (if it exists). If you choose 'n', Calgary will not be
527 used even if it exists. If you choose 'n' and would like to use
528 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
531 # need this always selected by IOMMU for the VIA workaround
535 Support for software bounce buffers used on x86-64 systems
536 which don't have a hardware IOMMU (e.g. the current generation
537 of Intel's x86-64 CPUs). Using this PCI devices which can only
538 access 32-bits of memory can be used on systems with more than
539 3 GB of memory. If unsure, say Y.
542 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB)
545 int "Maximum number of CPUs (2-255)"
548 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
551 This allows you to specify the maximum number of CPUs which this
552 kernel will support. The maximum supported value is 255 and the
553 minimum value which makes sense is 2.
555 This is purely to save memory - each supported CPU adds
556 approximately eight kilobytes to the kernel image.
559 bool "SMT (Hyperthreading) scheduler support"
562 SMT scheduler support improves the CPU scheduler's decision making
563 when dealing with Intel Pentium 4 chips with HyperThreading at a
564 cost of slightly increased overhead in some places. If unsure say
569 prompt "Multi-core scheduler support"
572 Multi-core scheduler support improves the CPU scheduler's decision
573 making when dealing with multi-core CPU chips at a cost of slightly
574 increased overhead in some places. If unsure say N here.
576 source "kernel/Kconfig.preempt"
579 bool "Local APIC support on uniprocessors"
580 depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
582 A local APIC (Advanced Programmable Interrupt Controller) is an
583 integrated interrupt controller in the CPU. If you have a single-CPU
584 system which has a processor with a local APIC, you can say Y here to
585 enable and use it. If you say Y here even though your machine doesn't
586 have a local APIC, then the kernel will still run with no slowdown at
587 all. The local APIC supports CPU-generated self-interrupts (timer,
588 performance counters), and the NMI watchdog which detects hard
592 bool "IO-APIC support on uniprocessors"
593 depends on X86_UP_APIC
595 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
596 SMP-capable replacement for PC-style interrupt controllers. Most
597 SMP systems and many recent uniprocessor systems have one.
599 If you have a single-CPU system with an IO-APIC, you can say Y here
600 to use it. If you say Y here even though your machine doesn't have
601 an IO-APIC, then the kernel will still run with no slowdown at all.
603 config X86_LOCAL_APIC
605 depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))
609 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))
611 config X86_VISWS_APIC
613 depends on X86_32 && X86_VISWS
616 bool "Machine Check Exception"
617 depends on !X86_VOYAGER
619 Machine Check Exception support allows the processor to notify the
620 kernel if it detects a problem (e.g. overheating, component failure).
621 The action the kernel takes depends on the severity of the problem,
622 ranging from a warning message on the console, to halting the machine.
623 Your processor must be a Pentium or newer to support this - check the
624 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
625 have a design flaw which leads to false MCE events - hence MCE is
626 disabled on all P5 processors, unless explicitly enabled with "mce"
627 as a boot argument. Similarly, if MCE is built in and creates a
628 problem on some new non-standard machine, you can boot with "nomce"
629 to disable it. MCE support simply ignores non-MCE processors like
630 the 386 and 486, so nearly everyone can say Y here.
634 prompt "Intel MCE features"
635 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
637 Additional support for intel specific MCE features such as
642 prompt "AMD MCE features"
643 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
645 Additional support for AMD specific MCE features such as
646 the DRAM Error Threshold.
648 config X86_MCE_NONFATAL
649 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
650 depends on X86_32 && X86_MCE
652 Enabling this feature starts a timer that triggers every 5 seconds which
653 will look at the machine check registers to see if anything happened.
654 Non-fatal problems automatically get corrected (but still logged).
655 Disable this if you don't want to see these messages.
656 Seeing the messages this option prints out may be indicative of dying
657 or out-of-spec (ie, overclocked) hardware.
658 This option only does something on certain CPUs.
659 (AMD Athlon/Duron and Intel Pentium 4)
661 config X86_MCE_P4THERMAL
662 bool "check for P4 thermal throttling interrupt."
663 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
665 Enabling this feature will cause a message to be printed when the P4
666 enters thermal throttling.
669 bool "Enable VM86 support" if EMBEDDED
673 This option is required by programs like DOSEMU to run 16-bit legacy
674 code on X86 processors. It also may be needed by software like
675 XFree86 to initialize some video cards via BIOS. Disabling this
676 option saves about 6k.
679 tristate "Toshiba Laptop support"
682 This adds a driver to safely access the System Management Mode of
683 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
684 not work on models with a Phoenix BIOS. The System Management Mode
685 is used to set the BIOS and power saving options on Toshiba portables.
687 For information on utilities to make use of this driver see the
688 Toshiba Linux utilities web site at:
689 <http://www.buzzard.org.uk/toshiba/>.
691 Say Y if you intend to run this kernel on a Toshiba portable.
695 tristate "Dell laptop support"
697 This adds a driver to safely access the System Management Mode
698 of the CPU on the Dell Inspiron 8000. The System Management Mode
699 is used to read cpu temperature and cooling fan status and to
700 control the fans on the I8K portables.
702 This driver has been tested only on the Inspiron 8000 but it may
703 also work with other Dell laptops. You can force loading on other
704 models by passing the parameter `force=1' to the module. Use at
707 For information on utilities to make use of this driver see the
708 I8K Linux utilities web site at:
709 <http://people.debian.org/~dz/i8k/>
711 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
714 config X86_REBOOTFIXUPS
716 prompt "Enable X86 board specific fixups for reboot"
717 depends on X86_32 && X86
719 This enables chipset and/or board specific fixups to be done
720 in order to get reboot to work correctly. This is only needed on
721 some combinations of hardware and BIOS. The symptom, for which
722 this config is intended, is when reboot ends with a stalled/hung
725 Currently, the only fixup is for the Geode machines using
726 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
728 Say Y if you want to enable the fixup. Currently, it's safe to
729 enable this option even if you don't need it.
733 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
736 If you say Y here, you will be able to update the microcode on
737 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
738 Pentium III, Pentium 4, Xeon etc. You will obviously need the
739 actual microcode binary data itself which is not shipped with the
742 For latest news and information on obtaining all the required
743 ingredients for this driver, check:
744 <http://www.urbanmyth.org/microcode/>.
746 To compile this driver as a module, choose M here: the
747 module will be called microcode.
749 config MICROCODE_OLD_INTERFACE
754 tristate "/dev/cpu/*/msr - Model-specific register support"
756 This device gives privileged processes access to the x86
757 Model-Specific Registers (MSRs). It is a character device with
758 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
759 MSR accesses are directed to a specific CPU on multi-processor
763 tristate "/dev/cpu/*/cpuid - CPU information support"
765 This device gives processes access to the x86 CPUID instruction to
766 be executed on a specific processor. It is a character device
767 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
771 prompt "High Memory Support"
772 default HIGHMEM4G if !X86_NUMAQ
773 default HIGHMEM64G if X86_NUMAQ
778 depends on !X86_NUMAQ
780 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
781 However, the address space of 32-bit x86 processors is only 4
782 Gigabytes large. That means that, if you have a large amount of
783 physical memory, not all of it can be "permanently mapped" by the
784 kernel. The physical memory that's not permanently mapped is called
787 If you are compiling a kernel which will never run on a machine with
788 more than 1 Gigabyte total physical RAM, answer "off" here (default
789 choice and suitable for most users). This will result in a "3GB/1GB"
790 split: 3GB are mapped so that each process sees a 3GB virtual memory
791 space and the remaining part of the 4GB virtual memory space is used
792 by the kernel to permanently map as much physical memory as
795 If the machine has between 1 and 4 Gigabytes physical RAM, then
798 If more than 4 Gigabytes is used then answer "64GB" here. This
799 selection turns Intel PAE (Physical Address Extension) mode on.
800 PAE implements 3-level paging on IA32 processors. PAE is fully
801 supported by Linux, PAE mode is implemented on all recent Intel
802 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
803 then the kernel will not boot on CPUs that don't support PAE!
805 The actual amount of total physical memory will either be
806 auto detected or can be forced by using a kernel command line option
807 such as "mem=256M". (Try "man bootparam" or see the documentation of
808 your boot loader (lilo or loadlin) about how to pass options to the
809 kernel at boot time.)
811 If unsure, say "off".
815 depends on !X86_NUMAQ
817 Select this if you have a 32-bit processor and between 1 and 4
818 gigabytes of physical RAM.
822 depends on !M386 && !M486
825 Select this if you have a 32-bit processor and more than 4
826 gigabytes of physical RAM.
831 depends on EXPERIMENTAL
832 prompt "Memory split" if EMBEDDED
836 Select the desired split between kernel and user memory.
838 If the address range available to the kernel is less than the
839 physical memory installed, the remaining memory will be available
840 as "high memory". Accessing high memory is a little more costly
841 than low memory, as it needs to be mapped into the kernel first.
842 Note that increasing the kernel address space limits the range
843 available to user programs, making the address space there
844 tighter. Selecting anything other than the default 3G/1G split
845 will also likely make your kernel incompatible with binary-only
848 If you are not absolutely sure what you are doing, leave this
852 bool "3G/1G user/kernel split"
853 config VMSPLIT_3G_OPT
855 bool "3G/1G user/kernel split (for full 1G low memory)"
857 bool "2G/2G user/kernel split"
858 config VMSPLIT_2G_OPT
860 bool "2G/2G user/kernel split (for full 2G low memory)"
862 bool "1G/3G user/kernel split"
867 default 0xB0000000 if VMSPLIT_3G_OPT
868 default 0x80000000 if VMSPLIT_2G
869 default 0x78000000 if VMSPLIT_2G_OPT
870 default 0x40000000 if VMSPLIT_1G
876 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
880 prompt "PAE (Physical Address Extension) Support"
881 depends on X86_32 && !HIGHMEM4G
882 select RESOURCES_64BIT
884 PAE is required for NX support, and furthermore enables
885 larger swapspace support for non-overcommit purposes. It
886 has the cost of more pagetable lookup overhead, and also
887 consumes more pagetable space per process.
889 # Common NUMA Features
891 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
893 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
895 default y if (X86_NUMAQ || X86_SUMMIT)
897 Enable NUMA (Non Uniform Memory Access) support.
898 The kernel will try to allocate memory used by a CPU on the
899 local memory controller of the CPU and add some more
900 NUMA awareness to the kernel.
902 For i386 this is currently highly experimental and should be only
903 used for kernel development. It might also cause boot failures.
904 For x86_64 this is recommended on all multiprocessor Opteron systems.
905 If the system is EM64T, you should say N unless your system is
908 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
909 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
913 prompt "Old style AMD Opteron NUMA detection"
914 depends on X86_64 && NUMA && PCI
916 Enable K8 NUMA node topology detection. You should say Y here if
917 you have a multi processor AMD K8 system. This uses an old
918 method to read the NUMA configuration directly from the builtin
919 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
920 instead, which also takes priority if both are compiled in.
922 config X86_64_ACPI_NUMA
924 prompt "ACPI NUMA detection"
925 depends on X86_64 && NUMA && ACPI && PCI
928 Enable ACPI SRAT based node topology detection.
930 # Some NUMA nodes have memory ranges that span
931 # other nodes. Even though a pfn is valid and
932 # between a node's start and end pfns, it may not
933 # reside on that node. See memmap_init_zone()
935 config NODES_SPAN_OTHER_NODES
937 depends on X86_64_ACPI_NUMA
940 bool "NUMA emulation"
941 depends on X86_64 && NUMA
943 Enable NUMA emulation. A flat machine will be split
944 into virtual nodes when booted with "numa=fake=N", where N is the
945 number of nodes. This is only useful for debugging.
948 int "Max num nodes shift(1-15)"
950 default "6" if X86_64
951 default "4" if X86_NUMAQ
953 depends on NEED_MULTIPLE_NODES
955 config HAVE_ARCH_BOOTMEM_NODE
957 depends on X86_32 && NUMA
959 config ARCH_HAVE_MEMORY_PRESENT
961 depends on X86_32 && DISCONTIGMEM
963 config NEED_NODE_MEMMAP_SIZE
965 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
967 config HAVE_ARCH_ALLOC_REMAP
969 depends on X86_32 && NUMA
971 config ARCH_FLATMEM_ENABLE
973 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
975 config ARCH_DISCONTIGMEM_ENABLE
977 depends on NUMA && X86_32
979 config ARCH_DISCONTIGMEM_DEFAULT
981 depends on NUMA && X86_32
983 config ARCH_SPARSEMEM_DEFAULT
987 config ARCH_SPARSEMEM_ENABLE
989 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
990 select SPARSEMEM_STATIC if X86_32
991 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
993 config ARCH_SELECT_MEMORY_MODEL
995 depends on ARCH_SPARSEMEM_ENABLE
997 config ARCH_MEMORY_PROBE
999 depends on MEMORY_HOTPLUG
1004 bool "Allocate 3rd-level pagetables from highmem"
1005 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1007 The VM uses one page table entry for each page of physical memory.
1008 For systems with a lot of RAM, this can be wasteful of precious
1009 low memory. Setting this option will put user-space page table
1010 entries in high memory.
1012 config MATH_EMULATION
1014 prompt "Math emulation" if X86_32
1016 Linux can emulate a math coprocessor (used for floating point
1017 operations) if you don't have one. 486DX and Pentium processors have
1018 a math coprocessor built in, 486SX and 386 do not, unless you added
1019 a 487DX or 387, respectively. (The messages during boot time can
1020 give you some hints here ["man dmesg"].) Everyone needs either a
1021 coprocessor or this emulation.
1023 If you don't have a math coprocessor, you need to say Y here; if you
1024 say Y here even though you have a coprocessor, the coprocessor will
1025 be used nevertheless. (This behavior can be changed with the kernel
1026 command line option "no387", which comes handy if your coprocessor
1027 is broken. Try "man bootparam" or see the documentation of your boot
1028 loader (lilo or loadlin) about how to pass options to the kernel at
1029 boot time.) This means that it is a good idea to say Y here if you
1030 intend to use this kernel on different machines.
1032 More information about the internals of the Linux math coprocessor
1033 emulation can be found in <file:arch/x86/math-emu/README>.
1035 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1036 kernel, it won't hurt.
1039 bool "MTRR (Memory Type Range Register) support"
1041 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1042 the Memory Type Range Registers (MTRRs) may be used to control
1043 processor access to memory ranges. This is most useful if you have
1044 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1045 allows bus write transfers to be combined into a larger transfer
1046 before bursting over the PCI/AGP bus. This can increase performance
1047 of image write operations 2.5 times or more. Saying Y here creates a
1048 /proc/mtrr file which may be used to manipulate your processor's
1049 MTRRs. Typically the X server should use this.
1051 This code has a reasonably generic interface so that similar
1052 control registers on other processors can be easily supported
1055 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1056 Registers (ARRs) which provide a similar functionality to MTRRs. For
1057 these, the ARRs are used to emulate the MTRRs.
1058 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1059 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1060 write-combining. All of these processors are supported by this code
1061 and it makes sense to say Y here if you have one of them.
1063 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1064 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1065 can lead to all sorts of problems, so it's good to say Y here.
1067 You can safely say Y even if your machine doesn't have MTRRs, you'll
1068 just add about 9 KB to your kernel.
1070 See <file:Documentation/mtrr.txt> for more information.
1074 prompt "x86 PAT support"
1077 Use PAT attributes to setup page level cache control.
1079 PATs are the modern equivalents of MTRRs and are much more
1080 flexible than MTRRs.
1082 Say N here if you see bootup problems (boot crash, boot hang,
1083 spontaneous reboots) or a non-working video driver.
1089 prompt "EFI runtime service support"
1092 This enables the kernel to use EFI runtime services that are
1093 available (such as the EFI variable services).
1095 This option is only useful on systems that have EFI firmware.
1096 In addition, you should use the latest ELILO loader available
1097 at <http://elilo.sourceforge.net> in order to take advantage
1098 of EFI runtime services. However, even with this option, the
1099 resultant kernel should continue to boot on existing non-EFI
1104 prompt "Enable kernel irq balancing"
1105 depends on X86_32 && SMP && X86_IO_APIC
1107 The default yes will allow the kernel to do irq load balancing.
1108 Saying no will keep the kernel from doing irq load balancing.
1112 prompt "Enable seccomp to safely compute untrusted bytecode"
1115 This kernel feature is useful for number crunching applications
1116 that may need to compute untrusted bytecode during their
1117 execution. By using pipes or other transports made available to
1118 the process as file descriptors supporting the read/write
1119 syscalls, it's possible to isolate those applications in
1120 their own address space using seccomp. Once seccomp is
1121 enabled via /proc/<pid>/seccomp, it cannot be disabled
1122 and the task is only allowed to execute a few safe syscalls
1123 defined by each seccomp mode.
1125 If unsure, say Y. Only embedded should say N here.
1127 config CC_STACKPROTECTOR
1128 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1129 depends on X86_64 && EXPERIMENTAL && BROKEN
1131 This option turns on the -fstack-protector GCC feature. This
1132 feature puts, at the beginning of critical functions, a canary
1133 value on the stack just before the return address, and validates
1134 the value just before actually returning. Stack based buffer
1135 overflows (that need to overwrite this return address) now also
1136 overwrite the canary, which gets detected and the attack is then
1137 neutralized via a kernel panic.
1139 This feature requires gcc version 4.2 or above, or a distribution
1140 gcc with the feature backported. Older versions are automatically
1141 detected and for those versions, this configuration option is ignored.
1143 config CC_STACKPROTECTOR_ALL
1144 bool "Use stack-protector for all functions"
1145 depends on CC_STACKPROTECTOR
1147 Normally, GCC only inserts the canary value protection for
1148 functions that use large-ish on-stack buffers. By enabling
1149 this option, GCC will be asked to do this for ALL functions.
1151 source kernel/Kconfig.hz
1154 bool "kexec system call"
1155 depends on X86_BIOS_REBOOT
1157 kexec is a system call that implements the ability to shutdown your
1158 current kernel, and to start another kernel. It is like a reboot
1159 but it is independent of the system firmware. And like a reboot
1160 you can start any kernel with it, not just Linux.
1162 The name comes from the similarity to the exec system call.
1164 It is an ongoing process to be certain the hardware in a machine
1165 is properly shutdown, so do not be surprised if this code does not
1166 initially work for you. It may help to enable device hotplugging
1167 support. As of this writing the exact hardware interface is
1168 strongly in flux, so no good recommendation can be made.
1171 bool "kernel crash dumps (EXPERIMENTAL)"
1172 depends on EXPERIMENTAL
1173 depends on X86_64 || (X86_32 && HIGHMEM)
1175 Generate crash dump after being started by kexec.
1176 This should be normally only set in special crash dump kernels
1177 which are loaded in the main kernel with kexec-tools into
1178 a specially reserved region and then later executed after
1179 a crash by kdump/kexec. The crash dump kernel must be compiled
1180 to a memory address not used by the main kernel or BIOS using
1181 PHYSICAL_START, or it must be built as a relocatable image
1182 (CONFIG_RELOCATABLE=y).
1183 For more details see Documentation/kdump/kdump.txt
1185 config PHYSICAL_START
1186 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1187 default "0x1000000" if X86_NUMAQ
1188 default "0x200000" if X86_64
1191 This gives the physical address where the kernel is loaded.
1193 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1194 bzImage will decompress itself to above physical address and
1195 run from there. Otherwise, bzImage will run from the address where
1196 it has been loaded by the boot loader and will ignore above physical
1199 In normal kdump cases one does not have to set/change this option
1200 as now bzImage can be compiled as a completely relocatable image
1201 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1202 address. This option is mainly useful for the folks who don't want
1203 to use a bzImage for capturing the crash dump and want to use a
1204 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1205 to be specifically compiled to run from a specific memory area
1206 (normally a reserved region) and this option comes handy.
1208 So if you are using bzImage for capturing the crash dump, leave
1209 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1210 Otherwise if you plan to use vmlinux for capturing the crash dump
1211 change this value to start of the reserved region (Typically 16MB
1212 0x1000000). In other words, it can be set based on the "X" value as
1213 specified in the "crashkernel=YM@XM" command line boot parameter
1214 passed to the panic-ed kernel. Typically this parameter is set as
1215 crashkernel=64M@16M. Please take a look at
1216 Documentation/kdump/kdump.txt for more details about crash dumps.
1218 Usage of bzImage for capturing the crash dump is recommended as
1219 one does not have to build two kernels. Same kernel can be used
1220 as production kernel and capture kernel. Above option should have
1221 gone away after relocatable bzImage support is introduced. But it
1222 is present because there are users out there who continue to use
1223 vmlinux for dump capture. This option should go away down the
1226 Don't change this unless you know what you are doing.
1229 bool "Build a relocatable kernel (EXPERIMENTAL)"
1230 depends on EXPERIMENTAL
1232 This builds a kernel image that retains relocation information
1233 so it can be loaded someplace besides the default 1MB.
1234 The relocations tend to make the kernel binary about 10% larger,
1235 but are discarded at runtime.
1237 One use is for the kexec on panic case where the recovery kernel
1238 must live at a different physical address than the primary
1241 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1242 it has been loaded at and the compile time physical address
1243 (CONFIG_PHYSICAL_START) is ignored.
1245 config PHYSICAL_ALIGN
1247 prompt "Alignment value to which kernel should be aligned" if X86_32
1248 default "0x100000" if X86_32
1249 default "0x200000" if X86_64
1250 range 0x2000 0x400000
1252 This value puts the alignment restrictions on physical address
1253 where kernel is loaded and run from. Kernel is compiled for an
1254 address which meets above alignment restriction.
1256 If bootloader loads the kernel at a non-aligned address and
1257 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1258 address aligned to above value and run from there.
1260 If bootloader loads the kernel at a non-aligned address and
1261 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1262 load address and decompress itself to the address it has been
1263 compiled for and run from there. The address for which kernel is
1264 compiled already meets above alignment restrictions. Hence the
1265 end result is that kernel runs from a physical address meeting
1266 above alignment restrictions.
1268 Don't change this unless you know what you are doing.
1271 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1272 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1274 Say Y here to experiment with turning CPUs off and on, and to
1275 enable suspend on SMP systems. CPUs can be controlled through
1276 /sys/devices/system/cpu.
1277 Say N if you want to disable CPU hotplug and don't need to
1282 prompt "Compat VDSO support"
1283 depends on X86_32 || IA32_EMULATION
1285 Map the 32-bit VDSO to the predictable old-style address too.
1287 Say N here if you are running a sufficiently recent glibc
1288 version (2.3.3 or later), to remove the high-mapped
1289 VDSO mapping and to exclusively use the randomized VDSO.
1295 config ARCH_ENABLE_MEMORY_HOTPLUG
1297 depends on X86_64 || (X86_32 && HIGHMEM)
1299 config HAVE_ARCH_EARLY_PFN_TO_NID
1303 menu "Power management options"
1304 depends on !X86_VOYAGER
1306 config ARCH_HIBERNATION_HEADER
1308 depends on X86_64 && HIBERNATION
1310 source "kernel/power/Kconfig"
1312 source "drivers/acpi/Kconfig"
1317 depends on APM || APM_MODULE
1320 tristate "APM (Advanced Power Management) BIOS support"
1321 depends on X86_32 && PM_SLEEP && !X86_VISWS
1323 APM is a BIOS specification for saving power using several different
1324 techniques. This is mostly useful for battery powered laptops with
1325 APM compliant BIOSes. If you say Y here, the system time will be
1326 reset after a RESUME operation, the /proc/apm device will provide
1327 battery status information, and user-space programs will receive
1328 notification of APM "events" (e.g. battery status change).
1330 If you select "Y" here, you can disable actual use of the APM
1331 BIOS by passing the "apm=off" option to the kernel at boot time.
1333 Note that the APM support is almost completely disabled for
1334 machines with more than one CPU.
1336 In order to use APM, you will need supporting software. For location
1337 and more information, read <file:Documentation/power/pm.txt> and the
1338 Battery Powered Linux mini-HOWTO, available from
1339 <http://www.tldp.org/docs.html#howto>.
1341 This driver does not spin down disk drives (see the hdparm(8)
1342 manpage ("man 8 hdparm") for that), and it doesn't turn off
1343 VESA-compliant "green" monitors.
1345 This driver does not support the TI 4000M TravelMate and the ACER
1346 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1347 desktop machines also don't have compliant BIOSes, and this driver
1348 may cause those machines to panic during the boot phase.
1350 Generally, if you don't have a battery in your machine, there isn't
1351 much point in using this driver and you should say N. If you get
1352 random kernel OOPSes or reboots that don't seem to be related to
1353 anything, try disabling/enabling this option (or disabling/enabling
1356 Some other things you should try when experiencing seemingly random,
1359 1) make sure that you have enough swap space and that it is
1361 2) pass the "no-hlt" option to the kernel
1362 3) switch on floating point emulation in the kernel and pass
1363 the "no387" option to the kernel
1364 4) pass the "floppy=nodma" option to the kernel
1365 5) pass the "mem=4M" option to the kernel (thereby disabling
1366 all but the first 4 MB of RAM)
1367 6) make sure that the CPU is not over clocked.
1368 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1369 8) disable the cache from your BIOS settings
1370 9) install a fan for the video card or exchange video RAM
1371 10) install a better fan for the CPU
1372 11) exchange RAM chips
1373 12) exchange the motherboard.
1375 To compile this driver as a module, choose M here: the
1376 module will be called apm.
1380 config APM_IGNORE_USER_SUSPEND
1381 bool "Ignore USER SUSPEND"
1383 This option will ignore USER SUSPEND requests. On machines with a
1384 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1385 series notebooks, it is necessary to say Y because of a BIOS bug.
1387 config APM_DO_ENABLE
1388 bool "Enable PM at boot time"
1390 Enable APM features at boot time. From page 36 of the APM BIOS
1391 specification: "When disabled, the APM BIOS does not automatically
1392 power manage devices, enter the Standby State, enter the Suspend
1393 State, or take power saving steps in response to CPU Idle calls."
1394 This driver will make CPU Idle calls when Linux is idle (unless this
1395 feature is turned off -- see "Do CPU IDLE calls", below). This
1396 should always save battery power, but more complicated APM features
1397 will be dependent on your BIOS implementation. You may need to turn
1398 this option off if your computer hangs at boot time when using APM
1399 support, or if it beeps continuously instead of suspending. Turn
1400 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1401 T400CDT. This is off by default since most machines do fine without
1405 bool "Make CPU Idle calls when idle"
1407 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1408 On some machines, this can activate improved power savings, such as
1409 a slowed CPU clock rate, when the machine is idle. These idle calls
1410 are made after the idle loop has run for some length of time (e.g.,
1411 333 mS). On some machines, this will cause a hang at boot time or
1412 whenever the CPU becomes idle. (On machines with more than one CPU,
1413 this option does nothing.)
1415 config APM_DISPLAY_BLANK
1416 bool "Enable console blanking using APM"
1418 Enable console blanking using the APM. Some laptops can use this to
1419 turn off the LCD backlight when the screen blanker of the Linux
1420 virtual console blanks the screen. Note that this is only used by
1421 the virtual console screen blanker, and won't turn off the backlight
1422 when using the X Window system. This also doesn't have anything to
1423 do with your VESA-compliant power-saving monitor. Further, this
1424 option doesn't work for all laptops -- it might not turn off your
1425 backlight at all, or it might print a lot of errors to the console,
1426 especially if you are using gpm.
1428 config APM_ALLOW_INTS
1429 bool "Allow interrupts during APM BIOS calls"
1431 Normally we disable external interrupts while we are making calls to
1432 the APM BIOS as a measure to lessen the effects of a badly behaving
1433 BIOS implementation. The BIOS should reenable interrupts if it
1434 needs to. Unfortunately, some BIOSes do not -- especially those in
1435 many of the newer IBM Thinkpads. If you experience hangs when you
1436 suspend, try setting this to Y. Otherwise, say N.
1438 config APM_REAL_MODE_POWER_OFF
1439 bool "Use real mode APM BIOS call to power off"
1441 Use real mode APM BIOS calls to switch off the computer. This is
1442 a work-around for a number of buggy BIOSes. Switch this option on if
1443 your computer crashes instead of powering off properly.
1447 source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1449 source "drivers/cpuidle/Kconfig"
1454 menu "Bus options (PCI etc.)"
1457 bool "PCI support" if !X86_VISWS && !X86_VSMP
1458 depends on !X86_VOYAGER
1460 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1462 Find out whether you have a PCI motherboard. PCI is the name of a
1463 bus system, i.e. the way the CPU talks to the other stuff inside
1464 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1465 VESA. If you have PCI, say Y, otherwise N.
1468 prompt "PCI access mode"
1469 depends on X86_32 && PCI && !X86_VISWS
1472 On PCI systems, the BIOS can be used to detect the PCI devices and
1473 determine their configuration. However, some old PCI motherboards
1474 have BIOS bugs and may crash if this is done. Also, some embedded
1475 PCI-based systems don't have any BIOS at all. Linux can also try to
1476 detect the PCI hardware directly without using the BIOS.
1478 With this option, you can specify how Linux should detect the
1479 PCI devices. If you choose "BIOS", the BIOS will be used,
1480 if you choose "Direct", the BIOS won't be used, and if you
1481 choose "MMConfig", then PCI Express MMCONFIG will be used.
1482 If you choose "Any", the kernel will try MMCONFIG, then the
1483 direct access method and falls back to the BIOS if that doesn't
1484 work. If unsure, go with the default, which is "Any".
1489 config PCI_GOMMCONFIG
1506 depends on X86_32 && !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1508 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1511 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC) || X86_VISWS)
1515 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
1519 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
1526 bool "Support mmconfig PCI config space access"
1527 depends on X86_64 && PCI && ACPI
1530 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1531 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1533 DMA remapping (DMAR) devices support enables independent address
1534 translations for Direct Memory Access (DMA) from devices.
1535 These DMA remapping devices are reported via ACPI tables
1536 and include PCI device scope covered by these DMA
1541 prompt "Support for Graphics workaround"
1544 Current Graphics drivers tend to use physical address
1545 for DMA and avoid using DMA APIs. Setting this config
1546 option permits the IOMMU driver to set a unity map for
1547 all the OS-visible memory. Hence the driver can continue
1548 to use physical addresses for DMA.
1550 config DMAR_FLOPPY_WA
1554 Floppy disk drivers are know to bypass DMA API calls
1555 thereby failing to work when IOMMU is enabled. This
1556 workaround will setup a 1:1 mapping for the first
1557 16M to make floppy (an ISA device) work.
1559 source "drivers/pci/pcie/Kconfig"
1561 source "drivers/pci/Kconfig"
1563 # x86_64 have no ISA slots, but do have ISA-style DMA.
1571 depends on !(X86_VOYAGER || X86_VISWS)
1573 Find out whether you have ISA slots on your motherboard. ISA is the
1574 name of a bus system, i.e. the way the CPU talks to the other stuff
1575 inside your box. Other bus systems are PCI, EISA, MicroChannel
1576 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1577 newer boards don't support it. If you have ISA, say Y, otherwise N.
1583 The Extended Industry Standard Architecture (EISA) bus was
1584 developed as an open alternative to the IBM MicroChannel bus.
1586 The EISA bus provided some of the features of the IBM MicroChannel
1587 bus while maintaining backward compatibility with cards made for
1588 the older ISA bus. The EISA bus saw limited use between 1988 and
1589 1995 when it was made obsolete by the PCI bus.
1591 Say Y here if you are building a kernel for an EISA-based machine.
1595 source "drivers/eisa/Kconfig"
1598 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1599 default y if X86_VOYAGER
1601 MicroChannel Architecture is found in some IBM PS/2 machines and
1602 laptops. It is a bus system similar to PCI or ISA. See
1603 <file:Documentation/mca.txt> (and especially the web page given
1604 there) before attempting to build an MCA bus kernel.
1606 source "drivers/mca/Kconfig"
1609 tristate "NatSemi SCx200 support"
1610 depends on !X86_VOYAGER
1612 This provides basic support for National Semiconductor's
1613 (now AMD's) Geode processors. The driver probes for the
1614 PCI-IDs of several on-chip devices, so its a good dependency
1615 for other scx200_* drivers.
1617 If compiled as a module, the driver is named scx200.
1619 config SCx200HR_TIMER
1620 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1621 depends on SCx200 && GENERIC_TIME
1624 This driver provides a clocksource built upon the on-chip
1625 27MHz high-resolution timer. Its also a workaround for
1626 NSC Geode SC-1100's buggy TSC, which loses time when the
1627 processor goes idle (as is done by the scheduler). The
1628 other workaround is idle=poll boot option.
1630 config GEODE_MFGPT_TIMER
1632 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
1633 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
1635 This driver provides a clock event source based on the MFGPT
1636 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1637 MFGPTs have a better resolution and max interval than the
1638 generic PIT, and are suitable for use as high-res timers.
1641 bool "One Laptop Per Child support"
1644 Add support for detecting the unique features of the OLPC
1651 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
1653 source "drivers/pcmcia/Kconfig"
1655 source "drivers/pci/hotplug/Kconfig"
1660 menu "Executable file formats / Emulations"
1662 source "fs/Kconfig.binfmt"
1664 config IA32_EMULATION
1665 bool "IA32 Emulation"
1667 select COMPAT_BINFMT_ELF
1669 Include code to run 32-bit programs under a 64-bit kernel. You should
1670 likely turn this on, unless you're 100% sure that you don't have any
1671 32-bit programs left.
1674 tristate "IA32 a.out support"
1675 depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
1677 Support old a.out binaries in the 32bit emulation.
1681 depends on IA32_EMULATION
1683 config COMPAT_FOR_U64_ALIGNMENT
1687 config SYSVIPC_COMPAT
1689 depends on X86_64 && COMPAT && SYSVIPC
1694 source "net/Kconfig"
1696 source "drivers/Kconfig"
1698 source "drivers/firmware/Kconfig"
1702 source "arch/x86/Kconfig.debug"
1704 source "security/Kconfig"
1706 source "crypto/Kconfig"
1708 source "arch/x86/kvm/Kconfig"
1710 source "lib/Kconfig"
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