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 select HAVE_KRETPROBES
25 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
26 select HAVE_ARCH_KGDB if !X86_VOYAGER
32 default "arch/x86/configs/i386_defconfig"
38 default "arch/x86/configs/x86_64_defconfig"
41 config GENERIC_LOCKBREAK
47 config GENERIC_CMOS_UPDATE
50 config CLOCKSOURCE_WATCHDOG
53 config GENERIC_CLOCKEVENTS
56 config GENERIC_CLOCKEVENTS_BROADCAST
58 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
60 config LOCKDEP_SUPPORT
63 config STACKTRACE_SUPPORT
66 config HAVE_LATENCYTOP_SUPPORT
69 config FAST_CMPXCHG_LOCAL
82 config GENERIC_ISA_DMA
92 config GENERIC_HWEIGHT
98 config ARCH_MAY_HAVE_PC_FDC
101 config RWSEM_GENERIC_SPINLOCK
104 config RWSEM_XCHGADD_ALGORITHM
107 config ARCH_HAS_ILOG2_U32
110 config ARCH_HAS_ILOG2_U64
113 config ARCH_HAS_CPU_IDLE_WAIT
116 config GENERIC_CALIBRATE_DELAY
119 config GENERIC_TIME_VSYSCALL
123 config ARCH_HAS_CPU_RELAX
126 config ARCH_HAS_CACHE_LINE_SIZE
129 config HAVE_SETUP_PER_CPU_AREA
130 def_bool X86_64 || (X86_SMP && !X86_VOYAGER)
132 config HAVE_CPUMASK_OF_CPU_MAP
135 config ARCH_HIBERNATION_POSSIBLE
137 depends on !SMP || !X86_VOYAGER
139 config ARCH_SUSPEND_POSSIBLE
141 depends on !X86_VOYAGER
147 config ARCH_POPULATES_NODE_MAP
154 config ARCH_SUPPORTS_AOUT
157 config ARCH_SUPPORTS_OPTIMIZED_INLINING
160 # Use the generic interrupt handling code in kernel/irq/:
161 config GENERIC_HARDIRQS
165 config GENERIC_IRQ_PROBE
169 config GENERIC_PENDING_IRQ
171 depends on GENERIC_HARDIRQS && SMP
176 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
181 depends on X86_32 && SMP
185 depends on X86_64 && SMP
190 depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || X86_64
193 config X86_BIOS_REBOOT
195 depends on !X86_VISWS && !X86_VOYAGER
198 config X86_TRAMPOLINE
200 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
205 source "init/Kconfig"
207 menu "Processor type and features"
209 source "kernel/time/Kconfig"
212 bool "Symmetric multi-processing support"
214 This enables support for systems with more than one CPU. If you have
215 a system with only one CPU, like most personal computers, say N. If
216 you have a system with more than one CPU, say Y.
218 If you say N here, the kernel will run on single and multiprocessor
219 machines, but will use only one CPU of a multiprocessor machine. If
220 you say Y here, the kernel will run on many, but not all,
221 singleprocessor machines. On a singleprocessor machine, the kernel
222 will run faster if you say N here.
224 Note that if you say Y here and choose architecture "586" or
225 "Pentium" under "Processor family", the kernel will not work on 486
226 architectures. Similarly, multiprocessor kernels for the "PPro"
227 architecture may not work on all Pentium based boards.
229 People using multiprocessor machines who say Y here should also say
230 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
231 Management" code will be disabled if you say Y here.
233 See also <file:Documentation/i386/IO-APIC.txt>,
234 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
235 <http://www.tldp.org/docs.html#howto>.
237 If you don't know what to do here, say N.
240 prompt "Subarchitecture Type"
246 Choose this option if your computer is a standard PC or compatible.
252 Select this for an AMD Elan processor.
254 Do not use this option for K6/Athlon/Opteron processors!
256 If unsure, choose "PC-compatible" instead.
260 depends on X86_32 && (SMP || BROKEN)
262 Voyager is an MCA-based 32-way capable SMP architecture proprietary
263 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
267 If you do not specifically know you have a Voyager based machine,
268 say N here, otherwise the kernel you build will not be bootable.
271 bool "NUMAQ (IBM/Sequent)"
272 depends on SMP && X86_32
275 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
276 multiquad box. This changes the way that processors are bootstrapped,
277 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
278 You will need a new lynxer.elf file to flash your firmware with - send
279 email to <Martin.Bligh@us.ibm.com>.
282 bool "Summit/EXA (IBM x440)"
283 depends on X86_32 && SMP
285 This option is needed for IBM systems that use the Summit/EXA chipset.
286 In particular, it is needed for the x440.
288 If you don't have one of these computers, you should say N here.
289 If you want to build a NUMA kernel, you must select ACPI.
292 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
293 depends on X86_32 && SMP
295 This option is needed for the systems that have more than 8 CPUs
296 and if the system is not of any sub-arch type above.
298 If you don't have such a system, you should say N here.
301 bool "SGI 320/540 (Visual Workstation)"
304 The SGI Visual Workstation series is an IA32-based workstation
305 based on SGI systems chips with some legacy PC hardware attached.
307 Say Y here to create a kernel to run on the SGI 320 or 540.
309 A kernel compiled for the Visual Workstation will not run on PCs
310 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
312 config X86_GENERICARCH
313 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
316 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
317 It is intended for a generic binary kernel.
318 If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
321 bool "Support for Unisys ES7000 IA32 series"
322 depends on X86_32 && SMP
324 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
325 supposed to run on an IA32-based Unisys ES7000 system.
326 Only choose this option if you have such a system, otherwise you
330 bool "RDC R-321x SoC"
333 select X86_REBOOTFIXUPS
338 This option is needed for RDC R-321x system-on-chip, also known
340 If you don't have one of these chips, you should say N here.
343 bool "Support for ScaleMP vSMP"
347 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
348 supposed to run on these EM64T-based machines. Only choose this option
349 if you have one of these machines.
353 config SCHED_NO_NO_OMIT_FRAME_POINTER
355 prompt "Single-depth WCHAN output"
358 Calculate simpler /proc/<PID>/wchan values. If this option
359 is disabled then wchan values will recurse back to the
360 caller function. This provides more accurate wchan values,
361 at the expense of slightly more scheduling overhead.
363 If in doubt, say "Y".
365 menuconfig PARAVIRT_GUEST
366 bool "Paravirtualized guest support"
368 Say Y here to get to see options related to running Linux under
369 various hypervisors. This option alone does not add any kernel code.
371 If you say N, all options in this submenu will be skipped and disabled.
375 source "arch/x86/xen/Kconfig"
378 bool "VMI Guest support"
381 depends on !(X86_VISWS || X86_VOYAGER)
383 VMI provides a paravirtualized interface to the VMware ESX server
384 (it could be used by other hypervisors in theory too, but is not
385 at the moment), by linking the kernel to a GPL-ed ROM module
386 provided by the hypervisor.
389 bool "KVM paravirtualized clock"
391 depends on !(X86_VISWS || X86_VOYAGER)
393 Turning on this option will allow you to run a paravirtualized clock
394 when running over the KVM hypervisor. Instead of relying on a PIT
395 (or probably other) emulation by the underlying device model, the host
396 provides the guest with timing infrastructure such as time of day, and
400 bool "KVM Guest support"
402 depends on !(X86_VISWS || X86_VOYAGER)
404 This option enables various optimizations for running under the KVM
407 source "arch/x86/lguest/Kconfig"
410 bool "Enable paravirtualization code"
411 depends on !(X86_VISWS || X86_VOYAGER)
413 This changes the kernel so it can modify itself when it is run
414 under a hypervisor, potentially improving performance significantly
415 over full virtualization. However, when run without a hypervisor
416 the kernel is theoretically slower and slightly larger.
420 config MEMTEST_BOOTPARAM
421 bool "Memtest boot parameter"
425 This option adds a kernel parameter 'memtest', which allows memtest
426 to be disabled at boot. If this option is selected, memtest
427 functionality can be disabled with memtest=0 on the kernel
428 command line. The purpose of this option is to allow a single
429 kernel image to be distributed with memtest built in, but not
432 If you are unsure how to answer this question, answer Y.
434 config MEMTEST_BOOTPARAM_VALUE
435 int "Memtest boot parameter default value (0-4)"
436 depends on MEMTEST_BOOTPARAM
440 This option sets the default value for the kernel parameter
441 'memtest', which allows memtest to be disabled at boot. If this
442 option is set to 0 (zero), the memtest kernel parameter will
443 default to 0, disabling memtest at bootup. If this option is
444 set to 4, the memtest kernel parameter will default to 4,
445 enabling memtest at bootup, and use that as pattern number.
447 If you are unsure how to answer this question, answer 0.
451 depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
454 config HAVE_ARCH_PARSE_SRAT
458 config X86_SUMMIT_NUMA
460 depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)
462 config X86_CYCLONE_TIMER
464 depends on X86_32 && X86_SUMMIT || X86_GENERICARCH
466 config ES7000_CLUSTERED_APIC
468 depends on SMP && X86_ES7000 && MPENTIUMIII
470 source "arch/x86/Kconfig.cpu"
474 prompt "HPET Timer Support" if X86_32
476 Use the IA-PC HPET (High Precision Event Timer) to manage
477 time in preference to the PIT and RTC, if a HPET is
479 HPET is the next generation timer replacing legacy 8254s.
480 The HPET provides a stable time base on SMP
481 systems, unlike the TSC, but it is more expensive to access,
482 as it is off-chip. You can find the HPET spec at
483 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
485 You can safely choose Y here. However, HPET will only be
486 activated if the platform and the BIOS support this feature.
487 Otherwise the 8254 will be used for timing services.
489 Choose N to continue using the legacy 8254 timer.
491 config HPET_EMULATE_RTC
493 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
495 # Mark as embedded because too many people got it wrong.
496 # The code disables itself when not needed.
499 bool "Enable DMI scanning" if EMBEDDED
501 Enabled scanning of DMI to identify machine quirks. Say Y
502 here unless you have verified that your setup is not
503 affected by entries in the DMI blacklist. Required by PNP
507 bool "GART IOMMU support" if EMBEDDED
511 depends on X86_64 && PCI
513 Support for full DMA access of devices with 32bit memory access only
514 on systems with more than 3GB. This is usually needed for USB,
515 sound, many IDE/SATA chipsets and some other devices.
516 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
517 based hardware IOMMU and a software bounce buffer based IOMMU used
518 on Intel systems and as fallback.
519 The code is only active when needed (enough memory and limited
520 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
524 bool "IBM Calgary IOMMU support"
526 depends on X86_64 && PCI && EXPERIMENTAL
528 Support for hardware IOMMUs in IBM's xSeries x366 and x460
529 systems. Needed to run systems with more than 3GB of memory
530 properly with 32-bit PCI devices that do not support DAC
531 (Double Address Cycle). Calgary also supports bus level
532 isolation, where all DMAs pass through the IOMMU. This
533 prevents them from going anywhere except their intended
534 destination. This catches hard-to-find kernel bugs and
535 mis-behaving drivers and devices that do not use the DMA-API
536 properly to set up their DMA buffers. The IOMMU can be
537 turned off at boot time with the iommu=off parameter.
538 Normally the kernel will make the right choice by itself.
541 config CALGARY_IOMMU_ENABLED_BY_DEFAULT
543 prompt "Should Calgary be enabled by default?"
544 depends on CALGARY_IOMMU
546 Should Calgary be enabled by default? if you choose 'y', Calgary
547 will be used (if it exists). If you choose 'n', Calgary will not be
548 used even if it exists. If you choose 'n' and would like to use
549 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
552 # need this always selected by IOMMU for the VIA workaround
556 Support for software bounce buffers used on x86-64 systems
557 which don't have a hardware IOMMU (e.g. the current generation
558 of Intel's x86-64 CPUs). Using this PCI devices which can only
559 access 32-bits of memory can be used on systems with more than
560 3 GB of memory. If unsure, say Y.
563 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB)
566 int "Maximum number of CPUs (2-255)"
569 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
572 This allows you to specify the maximum number of CPUs which this
573 kernel will support. The maximum supported value is 255 and the
574 minimum value which makes sense is 2.
576 This is purely to save memory - each supported CPU adds
577 approximately eight kilobytes to the kernel image.
580 bool "SMT (Hyperthreading) scheduler support"
583 SMT scheduler support improves the CPU scheduler's decision making
584 when dealing with Intel Pentium 4 chips with HyperThreading at a
585 cost of slightly increased overhead in some places. If unsure say
590 prompt "Multi-core scheduler support"
593 Multi-core scheduler support improves the CPU scheduler's decision
594 making when dealing with multi-core CPU chips at a cost of slightly
595 increased overhead in some places. If unsure say N here.
597 source "kernel/Kconfig.preempt"
600 bool "Local APIC support on uniprocessors"
601 depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
603 A local APIC (Advanced Programmable Interrupt Controller) is an
604 integrated interrupt controller in the CPU. If you have a single-CPU
605 system which has a processor with a local APIC, you can say Y here to
606 enable and use it. If you say Y here even though your machine doesn't
607 have a local APIC, then the kernel will still run with no slowdown at
608 all. The local APIC supports CPU-generated self-interrupts (timer,
609 performance counters), and the NMI watchdog which detects hard
613 bool "IO-APIC support on uniprocessors"
614 depends on X86_UP_APIC
616 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
617 SMP-capable replacement for PC-style interrupt controllers. Most
618 SMP systems and many recent uniprocessor systems have one.
620 If you have a single-CPU system with an IO-APIC, you can say Y here
621 to use it. If you say Y here even though your machine doesn't have
622 an IO-APIC, then the kernel will still run with no slowdown at all.
624 config X86_LOCAL_APIC
626 depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))
630 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))
632 config X86_VISWS_APIC
634 depends on X86_32 && X86_VISWS
637 bool "Machine Check Exception"
638 depends on !X86_VOYAGER
640 Machine Check Exception support allows the processor to notify the
641 kernel if it detects a problem (e.g. overheating, component failure).
642 The action the kernel takes depends on the severity of the problem,
643 ranging from a warning message on the console, to halting the machine.
644 Your processor must be a Pentium or newer to support this - check the
645 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
646 have a design flaw which leads to false MCE events - hence MCE is
647 disabled on all P5 processors, unless explicitly enabled with "mce"
648 as a boot argument. Similarly, if MCE is built in and creates a
649 problem on some new non-standard machine, you can boot with "nomce"
650 to disable it. MCE support simply ignores non-MCE processors like
651 the 386 and 486, so nearly everyone can say Y here.
655 prompt "Intel MCE features"
656 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
658 Additional support for intel specific MCE features such as
663 prompt "AMD MCE features"
664 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
666 Additional support for AMD specific MCE features such as
667 the DRAM Error Threshold.
669 config X86_MCE_NONFATAL
670 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
671 depends on X86_32 && X86_MCE
673 Enabling this feature starts a timer that triggers every 5 seconds which
674 will look at the machine check registers to see if anything happened.
675 Non-fatal problems automatically get corrected (but still logged).
676 Disable this if you don't want to see these messages.
677 Seeing the messages this option prints out may be indicative of dying
678 or out-of-spec (ie, overclocked) hardware.
679 This option only does something on certain CPUs.
680 (AMD Athlon/Duron and Intel Pentium 4)
682 config X86_MCE_P4THERMAL
683 bool "check for P4 thermal throttling interrupt."
684 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
686 Enabling this feature will cause a message to be printed when the P4
687 enters thermal throttling.
690 bool "Enable VM86 support" if EMBEDDED
694 This option is required by programs like DOSEMU to run 16-bit legacy
695 code on X86 processors. It also may be needed by software like
696 XFree86 to initialize some video cards via BIOS. Disabling this
697 option saves about 6k.
700 tristate "Toshiba Laptop support"
703 This adds a driver to safely access the System Management Mode of
704 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
705 not work on models with a Phoenix BIOS. The System Management Mode
706 is used to set the BIOS and power saving options on Toshiba portables.
708 For information on utilities to make use of this driver see the
709 Toshiba Linux utilities web site at:
710 <http://www.buzzard.org.uk/toshiba/>.
712 Say Y if you intend to run this kernel on a Toshiba portable.
716 tristate "Dell laptop support"
718 This adds a driver to safely access the System Management Mode
719 of the CPU on the Dell Inspiron 8000. The System Management Mode
720 is used to read cpu temperature and cooling fan status and to
721 control the fans on the I8K portables.
723 This driver has been tested only on the Inspiron 8000 but it may
724 also work with other Dell laptops. You can force loading on other
725 models by passing the parameter `force=1' to the module. Use at
728 For information on utilities to make use of this driver see the
729 I8K Linux utilities web site at:
730 <http://people.debian.org/~dz/i8k/>
732 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
735 config X86_REBOOTFIXUPS
737 prompt "Enable X86 board specific fixups for reboot"
738 depends on X86_32 && X86
740 This enables chipset and/or board specific fixups to be done
741 in order to get reboot to work correctly. This is only needed on
742 some combinations of hardware and BIOS. The symptom, for which
743 this config is intended, is when reboot ends with a stalled/hung
746 Currently, the only fixup is for the Geode machines using
747 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
749 Say Y if you want to enable the fixup. Currently, it's safe to
750 enable this option even if you don't need it.
754 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
757 If you say Y here, you will be able to update the microcode on
758 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
759 Pentium III, Pentium 4, Xeon etc. You will obviously need the
760 actual microcode binary data itself which is not shipped with the
763 For latest news and information on obtaining all the required
764 ingredients for this driver, check:
765 <http://www.urbanmyth.org/microcode/>.
767 To compile this driver as a module, choose M here: the
768 module will be called microcode.
770 config MICROCODE_OLD_INTERFACE
775 tristate "/dev/cpu/*/msr - Model-specific register support"
777 This device gives privileged processes access to the x86
778 Model-Specific Registers (MSRs). It is a character device with
779 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
780 MSR accesses are directed to a specific CPU on multi-processor
784 tristate "/dev/cpu/*/cpuid - CPU information support"
786 This device gives processes access to the x86 CPUID instruction to
787 be executed on a specific processor. It is a character device
788 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
792 prompt "High Memory Support"
793 default HIGHMEM4G if !X86_NUMAQ
794 default HIGHMEM64G if X86_NUMAQ
799 depends on !X86_NUMAQ
801 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
802 However, the address space of 32-bit x86 processors is only 4
803 Gigabytes large. That means that, if you have a large amount of
804 physical memory, not all of it can be "permanently mapped" by the
805 kernel. The physical memory that's not permanently mapped is called
808 If you are compiling a kernel which will never run on a machine with
809 more than 1 Gigabyte total physical RAM, answer "off" here (default
810 choice and suitable for most users). This will result in a "3GB/1GB"
811 split: 3GB are mapped so that each process sees a 3GB virtual memory
812 space and the remaining part of the 4GB virtual memory space is used
813 by the kernel to permanently map as much physical memory as
816 If the machine has between 1 and 4 Gigabytes physical RAM, then
819 If more than 4 Gigabytes is used then answer "64GB" here. This
820 selection turns Intel PAE (Physical Address Extension) mode on.
821 PAE implements 3-level paging on IA32 processors. PAE is fully
822 supported by Linux, PAE mode is implemented on all recent Intel
823 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
824 then the kernel will not boot on CPUs that don't support PAE!
826 The actual amount of total physical memory will either be
827 auto detected or can be forced by using a kernel command line option
828 such as "mem=256M". (Try "man bootparam" or see the documentation of
829 your boot loader (lilo or loadlin) about how to pass options to the
830 kernel at boot time.)
832 If unsure, say "off".
836 depends on !X86_NUMAQ
838 Select this if you have a 32-bit processor and between 1 and 4
839 gigabytes of physical RAM.
843 depends on !M386 && !M486
846 Select this if you have a 32-bit processor and more than 4
847 gigabytes of physical RAM.
852 depends on EXPERIMENTAL
853 prompt "Memory split" if EMBEDDED
857 Select the desired split between kernel and user memory.
859 If the address range available to the kernel is less than the
860 physical memory installed, the remaining memory will be available
861 as "high memory". Accessing high memory is a little more costly
862 than low memory, as it needs to be mapped into the kernel first.
863 Note that increasing the kernel address space limits the range
864 available to user programs, making the address space there
865 tighter. Selecting anything other than the default 3G/1G split
866 will also likely make your kernel incompatible with binary-only
869 If you are not absolutely sure what you are doing, leave this
873 bool "3G/1G user/kernel split"
874 config VMSPLIT_3G_OPT
876 bool "3G/1G user/kernel split (for full 1G low memory)"
878 bool "2G/2G user/kernel split"
879 config VMSPLIT_2G_OPT
881 bool "2G/2G user/kernel split (for full 2G low memory)"
883 bool "1G/3G user/kernel split"
888 default 0xB0000000 if VMSPLIT_3G_OPT
889 default 0x80000000 if VMSPLIT_2G
890 default 0x78000000 if VMSPLIT_2G_OPT
891 default 0x40000000 if VMSPLIT_1G
897 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
901 prompt "PAE (Physical Address Extension) Support"
902 depends on X86_32 && !HIGHMEM4G
903 select RESOURCES_64BIT
905 PAE is required for NX support, and furthermore enables
906 larger swapspace support for non-overcommit purposes. It
907 has the cost of more pagetable lookup overhead, and also
908 consumes more pagetable space per process.
910 # Common NUMA Features
912 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
914 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
916 default y if (X86_NUMAQ || X86_SUMMIT)
918 Enable NUMA (Non Uniform Memory Access) support.
919 The kernel will try to allocate memory used by a CPU on the
920 local memory controller of the CPU and add some more
921 NUMA awareness to the kernel.
923 For i386 this is currently highly experimental and should be only
924 used for kernel development. It might also cause boot failures.
925 For x86_64 this is recommended on all multiprocessor Opteron systems.
926 If the system is EM64T, you should say N unless your system is
929 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
930 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
934 prompt "Old style AMD Opteron NUMA detection"
935 depends on X86_64 && NUMA && PCI
937 Enable K8 NUMA node topology detection. You should say Y here if
938 you have a multi processor AMD K8 system. This uses an old
939 method to read the NUMA configuration directly from the builtin
940 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
941 instead, which also takes priority if both are compiled in.
943 config X86_64_ACPI_NUMA
945 prompt "ACPI NUMA detection"
946 depends on X86_64 && NUMA && ACPI && PCI
949 Enable ACPI SRAT based node topology detection.
951 # Some NUMA nodes have memory ranges that span
952 # other nodes. Even though a pfn is valid and
953 # between a node's start and end pfns, it may not
954 # reside on that node. See memmap_init_zone()
956 config NODES_SPAN_OTHER_NODES
958 depends on X86_64_ACPI_NUMA
961 bool "NUMA emulation"
962 depends on X86_64 && NUMA
964 Enable NUMA emulation. A flat machine will be split
965 into virtual nodes when booted with "numa=fake=N", where N is the
966 number of nodes. This is only useful for debugging.
969 int "Max num nodes shift(1-15)"
971 default "6" if X86_64
972 default "4" if X86_NUMAQ
974 depends on NEED_MULTIPLE_NODES
976 config HAVE_ARCH_BOOTMEM_NODE
978 depends on X86_32 && NUMA
980 config ARCH_HAVE_MEMORY_PRESENT
982 depends on X86_32 && DISCONTIGMEM
984 config NEED_NODE_MEMMAP_SIZE
986 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
988 config HAVE_ARCH_ALLOC_REMAP
990 depends on X86_32 && NUMA
992 config ARCH_FLATMEM_ENABLE
994 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
996 config ARCH_DISCONTIGMEM_ENABLE
998 depends on NUMA && X86_32
1000 config ARCH_DISCONTIGMEM_DEFAULT
1002 depends on NUMA && X86_32
1004 config ARCH_SPARSEMEM_DEFAULT
1008 config ARCH_SPARSEMEM_ENABLE
1010 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
1011 select SPARSEMEM_STATIC if X86_32
1012 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1014 config ARCH_SELECT_MEMORY_MODEL
1016 depends on ARCH_SPARSEMEM_ENABLE
1018 config ARCH_MEMORY_PROBE
1020 depends on MEMORY_HOTPLUG
1025 bool "Allocate 3rd-level pagetables from highmem"
1026 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1028 The VM uses one page table entry for each page of physical memory.
1029 For systems with a lot of RAM, this can be wasteful of precious
1030 low memory. Setting this option will put user-space page table
1031 entries in high memory.
1033 config MATH_EMULATION
1035 prompt "Math emulation" if X86_32
1037 Linux can emulate a math coprocessor (used for floating point
1038 operations) if you don't have one. 486DX and Pentium processors have
1039 a math coprocessor built in, 486SX and 386 do not, unless you added
1040 a 487DX or 387, respectively. (The messages during boot time can
1041 give you some hints here ["man dmesg"].) Everyone needs either a
1042 coprocessor or this emulation.
1044 If you don't have a math coprocessor, you need to say Y here; if you
1045 say Y here even though you have a coprocessor, the coprocessor will
1046 be used nevertheless. (This behavior can be changed with the kernel
1047 command line option "no387", which comes handy if your coprocessor
1048 is broken. Try "man bootparam" or see the documentation of your boot
1049 loader (lilo or loadlin) about how to pass options to the kernel at
1050 boot time.) This means that it is a good idea to say Y here if you
1051 intend to use this kernel on different machines.
1053 More information about the internals of the Linux math coprocessor
1054 emulation can be found in <file:arch/x86/math-emu/README>.
1056 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1057 kernel, it won't hurt.
1060 bool "MTRR (Memory Type Range Register) support"
1062 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1063 the Memory Type Range Registers (MTRRs) may be used to control
1064 processor access to memory ranges. This is most useful if you have
1065 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1066 allows bus write transfers to be combined into a larger transfer
1067 before bursting over the PCI/AGP bus. This can increase performance
1068 of image write operations 2.5 times or more. Saying Y here creates a
1069 /proc/mtrr file which may be used to manipulate your processor's
1070 MTRRs. Typically the X server should use this.
1072 This code has a reasonably generic interface so that similar
1073 control registers on other processors can be easily supported
1076 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1077 Registers (ARRs) which provide a similar functionality to MTRRs. For
1078 these, the ARRs are used to emulate the MTRRs.
1079 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1080 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1081 write-combining. All of these processors are supported by this code
1082 and it makes sense to say Y here if you have one of them.
1084 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1085 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1086 can lead to all sorts of problems, so it's good to say Y here.
1088 You can safely say Y even if your machine doesn't have MTRRs, you'll
1089 just add about 9 KB to your kernel.
1091 See <file:Documentation/mtrr.txt> for more information.
1095 prompt "x86 PAT support"
1098 Use PAT attributes to setup page level cache control.
1100 PATs are the modern equivalents of MTRRs and are much more
1101 flexible than MTRRs.
1103 Say N here if you see bootup problems (boot crash, boot hang,
1104 spontaneous reboots) or a non-working video driver.
1110 prompt "EFI runtime service support"
1113 This enables the kernel to use EFI runtime services that are
1114 available (such as the EFI variable services).
1116 This option is only useful on systems that have EFI firmware.
1117 In addition, you should use the latest ELILO loader available
1118 at <http://elilo.sourceforge.net> in order to take advantage
1119 of EFI runtime services. However, even with this option, the
1120 resultant kernel should continue to boot on existing non-EFI
1125 prompt "Enable kernel irq balancing"
1126 depends on X86_32 && SMP && X86_IO_APIC
1128 The default yes will allow the kernel to do irq load balancing.
1129 Saying no will keep the kernel from doing irq load balancing.
1133 prompt "Enable seccomp to safely compute untrusted bytecode"
1136 This kernel feature is useful for number crunching applications
1137 that may need to compute untrusted bytecode during their
1138 execution. By using pipes or other transports made available to
1139 the process as file descriptors supporting the read/write
1140 syscalls, it's possible to isolate those applications in
1141 their own address space using seccomp. Once seccomp is
1142 enabled via /proc/<pid>/seccomp, it cannot be disabled
1143 and the task is only allowed to execute a few safe syscalls
1144 defined by each seccomp mode.
1146 If unsure, say Y. Only embedded should say N here.
1148 config CC_STACKPROTECTOR
1149 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1150 depends on X86_64 && EXPERIMENTAL && BROKEN
1152 This option turns on the -fstack-protector GCC feature. This
1153 feature puts, at the beginning of critical functions, a canary
1154 value on the stack just before the return address, and validates
1155 the value just before actually returning. Stack based buffer
1156 overflows (that need to overwrite this return address) now also
1157 overwrite the canary, which gets detected and the attack is then
1158 neutralized via a kernel panic.
1160 This feature requires gcc version 4.2 or above, or a distribution
1161 gcc with the feature backported. Older versions are automatically
1162 detected and for those versions, this configuration option is ignored.
1164 config CC_STACKPROTECTOR_ALL
1165 bool "Use stack-protector for all functions"
1166 depends on CC_STACKPROTECTOR
1168 Normally, GCC only inserts the canary value protection for
1169 functions that use large-ish on-stack buffers. By enabling
1170 this option, GCC will be asked to do this for ALL functions.
1172 source kernel/Kconfig.hz
1175 bool "kexec system call"
1176 depends on X86_BIOS_REBOOT
1178 kexec is a system call that implements the ability to shutdown your
1179 current kernel, and to start another kernel. It is like a reboot
1180 but it is independent of the system firmware. And like a reboot
1181 you can start any kernel with it, not just Linux.
1183 The name comes from the similarity to the exec system call.
1185 It is an ongoing process to be certain the hardware in a machine
1186 is properly shutdown, so do not be surprised if this code does not
1187 initially work for you. It may help to enable device hotplugging
1188 support. As of this writing the exact hardware interface is
1189 strongly in flux, so no good recommendation can be made.
1192 bool "kernel crash dumps (EXPERIMENTAL)"
1193 depends on EXPERIMENTAL
1194 depends on X86_64 || (X86_32 && HIGHMEM)
1196 Generate crash dump after being started by kexec.
1197 This should be normally only set in special crash dump kernels
1198 which are loaded in the main kernel with kexec-tools into
1199 a specially reserved region and then later executed after
1200 a crash by kdump/kexec. The crash dump kernel must be compiled
1201 to a memory address not used by the main kernel or BIOS using
1202 PHYSICAL_START, or it must be built as a relocatable image
1203 (CONFIG_RELOCATABLE=y).
1204 For more details see Documentation/kdump/kdump.txt
1206 config PHYSICAL_START
1207 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1208 default "0x1000000" if X86_NUMAQ
1209 default "0x200000" if X86_64
1212 This gives the physical address where the kernel is loaded.
1214 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1215 bzImage will decompress itself to above physical address and
1216 run from there. Otherwise, bzImage will run from the address where
1217 it has been loaded by the boot loader and will ignore above physical
1220 In normal kdump cases one does not have to set/change this option
1221 as now bzImage can be compiled as a completely relocatable image
1222 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1223 address. This option is mainly useful for the folks who don't want
1224 to use a bzImage for capturing the crash dump and want to use a
1225 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1226 to be specifically compiled to run from a specific memory area
1227 (normally a reserved region) and this option comes handy.
1229 So if you are using bzImage for capturing the crash dump, leave
1230 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1231 Otherwise if you plan to use vmlinux for capturing the crash dump
1232 change this value to start of the reserved region (Typically 16MB
1233 0x1000000). In other words, it can be set based on the "X" value as
1234 specified in the "crashkernel=YM@XM" command line boot parameter
1235 passed to the panic-ed kernel. Typically this parameter is set as
1236 crashkernel=64M@16M. Please take a look at
1237 Documentation/kdump/kdump.txt for more details about crash dumps.
1239 Usage of bzImage for capturing the crash dump is recommended as
1240 one does not have to build two kernels. Same kernel can be used
1241 as production kernel and capture kernel. Above option should have
1242 gone away after relocatable bzImage support is introduced. But it
1243 is present because there are users out there who continue to use
1244 vmlinux for dump capture. This option should go away down the
1247 Don't change this unless you know what you are doing.
1250 bool "Build a relocatable kernel (EXPERIMENTAL)"
1251 depends on EXPERIMENTAL
1253 This builds a kernel image that retains relocation information
1254 so it can be loaded someplace besides the default 1MB.
1255 The relocations tend to make the kernel binary about 10% larger,
1256 but are discarded at runtime.
1258 One use is for the kexec on panic case where the recovery kernel
1259 must live at a different physical address than the primary
1262 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1263 it has been loaded at and the compile time physical address
1264 (CONFIG_PHYSICAL_START) is ignored.
1266 config PHYSICAL_ALIGN
1268 prompt "Alignment value to which kernel should be aligned" if X86_32
1269 default "0x100000" if X86_32
1270 default "0x200000" if X86_64
1271 range 0x2000 0x400000
1273 This value puts the alignment restrictions on physical address
1274 where kernel is loaded and run from. Kernel is compiled for an
1275 address which meets above alignment restriction.
1277 If bootloader loads the kernel at a non-aligned address and
1278 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1279 address aligned to above value and run from there.
1281 If bootloader loads the kernel at a non-aligned address and
1282 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1283 load address and decompress itself to the address it has been
1284 compiled for and run from there. The address for which kernel is
1285 compiled already meets above alignment restrictions. Hence the
1286 end result is that kernel runs from a physical address meeting
1287 above alignment restrictions.
1289 Don't change this unless you know what you are doing.
1292 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1293 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1295 Say Y here to experiment with turning CPUs off and on, and to
1296 enable suspend on SMP systems. CPUs can be controlled through
1297 /sys/devices/system/cpu.
1298 Say N if you want to disable CPU hotplug and don't need to
1303 prompt "Compat VDSO support"
1304 depends on X86_32 || IA32_EMULATION
1306 Map the 32-bit VDSO to the predictable old-style address too.
1308 Say N here if you are running a sufficiently recent glibc
1309 version (2.3.3 or later), to remove the high-mapped
1310 VDSO mapping and to exclusively use the randomized VDSO.
1316 config ARCH_ENABLE_MEMORY_HOTPLUG
1318 depends on X86_64 || (X86_32 && HIGHMEM)
1320 config HAVE_ARCH_EARLY_PFN_TO_NID
1324 menu "Power management options"
1325 depends on !X86_VOYAGER
1327 config ARCH_HIBERNATION_HEADER
1329 depends on X86_64 && HIBERNATION
1331 source "kernel/power/Kconfig"
1333 source "drivers/acpi/Kconfig"
1338 depends on APM || APM_MODULE
1341 tristate "APM (Advanced Power Management) BIOS support"
1342 depends on X86_32 && PM_SLEEP && !X86_VISWS
1344 APM is a BIOS specification for saving power using several different
1345 techniques. This is mostly useful for battery powered laptops with
1346 APM compliant BIOSes. If you say Y here, the system time will be
1347 reset after a RESUME operation, the /proc/apm device will provide
1348 battery status information, and user-space programs will receive
1349 notification of APM "events" (e.g. battery status change).
1351 If you select "Y" here, you can disable actual use of the APM
1352 BIOS by passing the "apm=off" option to the kernel at boot time.
1354 Note that the APM support is almost completely disabled for
1355 machines with more than one CPU.
1357 In order to use APM, you will need supporting software. For location
1358 and more information, read <file:Documentation/power/pm.txt> and the
1359 Battery Powered Linux mini-HOWTO, available from
1360 <http://www.tldp.org/docs.html#howto>.
1362 This driver does not spin down disk drives (see the hdparm(8)
1363 manpage ("man 8 hdparm") for that), and it doesn't turn off
1364 VESA-compliant "green" monitors.
1366 This driver does not support the TI 4000M TravelMate and the ACER
1367 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1368 desktop machines also don't have compliant BIOSes, and this driver
1369 may cause those machines to panic during the boot phase.
1371 Generally, if you don't have a battery in your machine, there isn't
1372 much point in using this driver and you should say N. If you get
1373 random kernel OOPSes or reboots that don't seem to be related to
1374 anything, try disabling/enabling this option (or disabling/enabling
1377 Some other things you should try when experiencing seemingly random,
1380 1) make sure that you have enough swap space and that it is
1382 2) pass the "no-hlt" option to the kernel
1383 3) switch on floating point emulation in the kernel and pass
1384 the "no387" option to the kernel
1385 4) pass the "floppy=nodma" option to the kernel
1386 5) pass the "mem=4M" option to the kernel (thereby disabling
1387 all but the first 4 MB of RAM)
1388 6) make sure that the CPU is not over clocked.
1389 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1390 8) disable the cache from your BIOS settings
1391 9) install a fan for the video card or exchange video RAM
1392 10) install a better fan for the CPU
1393 11) exchange RAM chips
1394 12) exchange the motherboard.
1396 To compile this driver as a module, choose M here: the
1397 module will be called apm.
1401 config APM_IGNORE_USER_SUSPEND
1402 bool "Ignore USER SUSPEND"
1404 This option will ignore USER SUSPEND requests. On machines with a
1405 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1406 series notebooks, it is necessary to say Y because of a BIOS bug.
1408 config APM_DO_ENABLE
1409 bool "Enable PM at boot time"
1411 Enable APM features at boot time. From page 36 of the APM BIOS
1412 specification: "When disabled, the APM BIOS does not automatically
1413 power manage devices, enter the Standby State, enter the Suspend
1414 State, or take power saving steps in response to CPU Idle calls."
1415 This driver will make CPU Idle calls when Linux is idle (unless this
1416 feature is turned off -- see "Do CPU IDLE calls", below). This
1417 should always save battery power, but more complicated APM features
1418 will be dependent on your BIOS implementation. You may need to turn
1419 this option off if your computer hangs at boot time when using APM
1420 support, or if it beeps continuously instead of suspending. Turn
1421 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1422 T400CDT. This is off by default since most machines do fine without
1426 bool "Make CPU Idle calls when idle"
1428 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1429 On some machines, this can activate improved power savings, such as
1430 a slowed CPU clock rate, when the machine is idle. These idle calls
1431 are made after the idle loop has run for some length of time (e.g.,
1432 333 mS). On some machines, this will cause a hang at boot time or
1433 whenever the CPU becomes idle. (On machines with more than one CPU,
1434 this option does nothing.)
1436 config APM_DISPLAY_BLANK
1437 bool "Enable console blanking using APM"
1439 Enable console blanking using the APM. Some laptops can use this to
1440 turn off the LCD backlight when the screen blanker of the Linux
1441 virtual console blanks the screen. Note that this is only used by
1442 the virtual console screen blanker, and won't turn off the backlight
1443 when using the X Window system. This also doesn't have anything to
1444 do with your VESA-compliant power-saving monitor. Further, this
1445 option doesn't work for all laptops -- it might not turn off your
1446 backlight at all, or it might print a lot of errors to the console,
1447 especially if you are using gpm.
1449 config APM_ALLOW_INTS
1450 bool "Allow interrupts during APM BIOS calls"
1452 Normally we disable external interrupts while we are making calls to
1453 the APM BIOS as a measure to lessen the effects of a badly behaving
1454 BIOS implementation. The BIOS should reenable interrupts if it
1455 needs to. Unfortunately, some BIOSes do not -- especially those in
1456 many of the newer IBM Thinkpads. If you experience hangs when you
1457 suspend, try setting this to Y. Otherwise, say N.
1459 config APM_REAL_MODE_POWER_OFF
1460 bool "Use real mode APM BIOS call to power off"
1462 Use real mode APM BIOS calls to switch off the computer. This is
1463 a work-around for a number of buggy BIOSes. Switch this option on if
1464 your computer crashes instead of powering off properly.
1468 source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1470 source "drivers/cpuidle/Kconfig"
1475 menu "Bus options (PCI etc.)"
1478 bool "PCI support" if !X86_VISWS && !X86_VSMP
1479 depends on !X86_VOYAGER
1481 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1483 Find out whether you have a PCI motherboard. PCI is the name of a
1484 bus system, i.e. the way the CPU talks to the other stuff inside
1485 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1486 VESA. If you have PCI, say Y, otherwise N.
1489 prompt "PCI access mode"
1490 depends on X86_32 && PCI && !X86_VISWS
1493 On PCI systems, the BIOS can be used to detect the PCI devices and
1494 determine their configuration. However, some old PCI motherboards
1495 have BIOS bugs and may crash if this is done. Also, some embedded
1496 PCI-based systems don't have any BIOS at all. Linux can also try to
1497 detect the PCI hardware directly without using the BIOS.
1499 With this option, you can specify how Linux should detect the
1500 PCI devices. If you choose "BIOS", the BIOS will be used,
1501 if you choose "Direct", the BIOS won't be used, and if you
1502 choose "MMConfig", then PCI Express MMCONFIG will be used.
1503 If you choose "Any", the kernel will try MMCONFIG, then the
1504 direct access method and falls back to the BIOS if that doesn't
1505 work. If unsure, go with the default, which is "Any".
1510 config PCI_GOMMCONFIG
1527 depends on X86_32 && !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1529 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1532 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC) || X86_VISWS)
1536 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
1540 depends on PCI && PCI_GOOLPC
1548 bool "Support mmconfig PCI config space access"
1549 depends on X86_64 && PCI && ACPI
1552 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1553 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1555 DMA remapping (DMAR) devices support enables independent address
1556 translations for Direct Memory Access (DMA) from devices.
1557 These DMA remapping devices are reported via ACPI tables
1558 and include PCI device scope covered by these DMA
1563 prompt "Support for Graphics workaround"
1566 Current Graphics drivers tend to use physical address
1567 for DMA and avoid using DMA APIs. Setting this config
1568 option permits the IOMMU driver to set a unity map for
1569 all the OS-visible memory. Hence the driver can continue
1570 to use physical addresses for DMA.
1572 config DMAR_FLOPPY_WA
1576 Floppy disk drivers are know to bypass DMA API calls
1577 thereby failing to work when IOMMU is enabled. This
1578 workaround will setup a 1:1 mapping for the first
1579 16M to make floppy (an ISA device) work.
1581 source "drivers/pci/pcie/Kconfig"
1583 source "drivers/pci/Kconfig"
1585 # x86_64 have no ISA slots, but do have ISA-style DMA.
1593 depends on !(X86_VOYAGER || X86_VISWS)
1595 Find out whether you have ISA slots on your motherboard. ISA is the
1596 name of a bus system, i.e. the way the CPU talks to the other stuff
1597 inside your box. Other bus systems are PCI, EISA, MicroChannel
1598 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1599 newer boards don't support it. If you have ISA, say Y, otherwise N.
1605 The Extended Industry Standard Architecture (EISA) bus was
1606 developed as an open alternative to the IBM MicroChannel bus.
1608 The EISA bus provided some of the features of the IBM MicroChannel
1609 bus while maintaining backward compatibility with cards made for
1610 the older ISA bus. The EISA bus saw limited use between 1988 and
1611 1995 when it was made obsolete by the PCI bus.
1613 Say Y here if you are building a kernel for an EISA-based machine.
1617 source "drivers/eisa/Kconfig"
1620 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1621 default y if X86_VOYAGER
1623 MicroChannel Architecture is found in some IBM PS/2 machines and
1624 laptops. It is a bus system similar to PCI or ISA. See
1625 <file:Documentation/mca.txt> (and especially the web page given
1626 there) before attempting to build an MCA bus kernel.
1628 source "drivers/mca/Kconfig"
1631 tristate "NatSemi SCx200 support"
1632 depends on !X86_VOYAGER
1634 This provides basic support for National Semiconductor's
1635 (now AMD's) Geode processors. The driver probes for the
1636 PCI-IDs of several on-chip devices, so its a good dependency
1637 for other scx200_* drivers.
1639 If compiled as a module, the driver is named scx200.
1641 config SCx200HR_TIMER
1642 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1643 depends on SCx200 && GENERIC_TIME
1646 This driver provides a clocksource built upon the on-chip
1647 27MHz high-resolution timer. Its also a workaround for
1648 NSC Geode SC-1100's buggy TSC, which loses time when the
1649 processor goes idle (as is done by the scheduler). The
1650 other workaround is idle=poll boot option.
1652 config GEODE_MFGPT_TIMER
1654 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
1655 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
1657 This driver provides a clock event source based on the MFGPT
1658 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1659 MFGPTs have a better resolution and max interval than the
1660 generic PIT, and are suitable for use as high-res timers.
1663 bool "One Laptop Per Child support"
1666 Add support for detecting the unique features of the OLPC
1673 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
1675 source "drivers/pcmcia/Kconfig"
1677 source "drivers/pci/hotplug/Kconfig"
1682 menu "Executable file formats / Emulations"
1684 source "fs/Kconfig.binfmt"
1686 config IA32_EMULATION
1687 bool "IA32 Emulation"
1689 select COMPAT_BINFMT_ELF
1691 Include code to run 32-bit programs under a 64-bit kernel. You should
1692 likely turn this on, unless you're 100% sure that you don't have any
1693 32-bit programs left.
1696 tristate "IA32 a.out support"
1697 depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
1699 Support old a.out binaries in the 32bit emulation.
1703 depends on IA32_EMULATION
1705 config COMPAT_FOR_U64_ALIGNMENT
1709 config SYSVIPC_COMPAT
1711 depends on X86_64 && COMPAT && SYSVIPC
1716 source "net/Kconfig"
1718 source "drivers/Kconfig"
1720 source "drivers/firmware/Kconfig"
1724 source "arch/x86/Kconfig.debug"
1726 source "security/Kconfig"
1728 source "crypto/Kconfig"
1730 source "arch/x86/kvm/Kconfig"
1732 source "lib/Kconfig"
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