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1 # x86 configuration
2 mainmenu "Linux Kernel Configuration for x86"
4 # Select 32 or 64 bit
5 config 64BIT
6 bool "64-bit kernel" if ARCH = "x86"
7 default ARCH = "x86_64"
8 help
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
12 config X86_32
13 def_bool !64BIT
15 config X86_64
16 def_bool 64BIT
18 ### Arch settings
19 config X86
20 def_bool y
22 config GENERIC_LOCKBREAK
23 def_bool n
25 config GENERIC_TIME
26 def_bool y
28 config GENERIC_CMOS_UPDATE
29 def_bool y
31 config CLOCKSOURCE_WATCHDOG
32 def_bool y
34 config GENERIC_CLOCKEVENTS
35 def_bool y
37 config GENERIC_CLOCKEVENTS_BROADCAST
38 def_bool y
39 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
41 config LOCKDEP_SUPPORT
42 def_bool y
44 config STACKTRACE_SUPPORT
45 def_bool y
47 config HAVE_LATENCYTOP_SUPPORT
48 def_bool y
50 config SEMAPHORE_SLEEPERS
51 def_bool y
53 config MMU
54 def_bool y
56 config ZONE_DMA
57 def_bool y
59 config QUICKLIST
60 def_bool X86_32
62 config SBUS
63 bool
65 config GENERIC_ISA_DMA
66 def_bool y
68 config GENERIC_IOMAP
69 def_bool y
71 config GENERIC_BUG
72 def_bool y
73 depends on BUG
75 config GENERIC_HWEIGHT
76 def_bool y
78 config GENERIC_GPIO
79 def_bool n
81 config ARCH_MAY_HAVE_PC_FDC
82 def_bool y
84 config DMI
85 def_bool y
87 config RWSEM_GENERIC_SPINLOCK
88 def_bool !X86_XADD
90 config RWSEM_XCHGADD_ALGORITHM
91 def_bool X86_XADD
93 config ARCH_HAS_ILOG2_U32
94 def_bool n
96 config ARCH_HAS_ILOG2_U64
97 def_bool n
99 config GENERIC_CALIBRATE_DELAY
100 def_bool y
102 config GENERIC_TIME_VSYSCALL
103 bool
104 default X86_64
106 config HAVE_SETUP_PER_CPU_AREA
107 def_bool X86_64
109 config ARCH_SUPPORTS_OPROFILE
110 bool
111 default y
113 select HAVE_KVM
115 config ARCH_HIBERNATION_POSSIBLE
116 def_bool y
117 depends on !SMP || !X86_VOYAGER
119 config ARCH_SUSPEND_POSSIBLE
120 def_bool y
121 depends on !X86_VOYAGER
123 config ZONE_DMA32
124 bool
125 default X86_64
127 config ARCH_POPULATES_NODE_MAP
128 def_bool y
130 config AUDIT_ARCH
131 bool
132 default X86_64
134 # Use the generic interrupt handling code in kernel/irq/:
135 config GENERIC_HARDIRQS
136 bool
137 default y
139 config GENERIC_IRQ_PROBE
140 bool
141 default y
143 config GENERIC_PENDING_IRQ
144 bool
145 depends on GENERIC_HARDIRQS && SMP
146 default y
148 config X86_SMP
149 bool
150 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
151 default y
153 config X86_32_SMP
154 def_bool y
155 depends on X86_32 && SMP
157 config X86_64_SMP
158 def_bool y
159 depends on X86_64 && SMP
161 config X86_HT
162 bool
163 depends on SMP
164 depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || (X86_64 && !MK8)
165 default y
167 config X86_BIOS_REBOOT
168 bool
169 depends on X86_32 && !(X86_VISWS || X86_VOYAGER)
170 default y
172 config X86_TRAMPOLINE
173 bool
174 depends on X86_SMP || (X86_VOYAGER && SMP)
175 default y
177 config KTIME_SCALAR
178 def_bool X86_32
179 source "init/Kconfig"
181 menu "Processor type and features"
183 source "kernel/time/Kconfig"
185 config SMP
186 bool "Symmetric multi-processing support"
187 ---help---
188 This enables support for systems with more than one CPU. If you have
189 a system with only one CPU, like most personal computers, say N. If
190 you have a system with more than one CPU, say Y.
192 If you say N here, the kernel will run on single and multiprocessor
193 machines, but will use only one CPU of a multiprocessor machine. If
194 you say Y here, the kernel will run on many, but not all,
195 singleprocessor machines. On a singleprocessor machine, the kernel
196 will run faster if you say N here.
198 Note that if you say Y here and choose architecture "586" or
199 "Pentium" under "Processor family", the kernel will not work on 486
200 architectures. Similarly, multiprocessor kernels for the "PPro"
201 architecture may not work on all Pentium based boards.
203 People using multiprocessor machines who say Y here should also say
204 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
205 Management" code will be disabled if you say Y here.
207 See also the <file:Documentation/smp.txt>,
208 <file:Documentation/i386/IO-APIC.txt>,
209 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
210 <http://www.tldp.org/docs.html#howto>.
212 If you don't know what to do here, say N.
214 choice
215 prompt "Subarchitecture Type"
216 default X86_PC
218 config X86_PC
219 bool "PC-compatible"
220 help
221 Choose this option if your computer is a standard PC or compatible.
223 config X86_ELAN
224 bool "AMD Elan"
225 depends on X86_32
226 help
227 Select this for an AMD Elan processor.
229 Do not use this option for K6/Athlon/Opteron processors!
231 If unsure, choose "PC-compatible" instead.
233 config X86_VOYAGER
234 bool "Voyager (NCR)"
235 depends on X86_32
236 select SMP if !BROKEN
237 help
238 Voyager is an MCA-based 32-way capable SMP architecture proprietary
239 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
241 *** WARNING ***
243 If you do not specifically know you have a Voyager based machine,
244 say N here, otherwise the kernel you build will not be bootable.
246 config X86_NUMAQ
247 bool "NUMAQ (IBM/Sequent)"
248 select SMP
249 select NUMA
250 depends on X86_32
251 help
252 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
253 multiquad box. This changes the way that processors are bootstrapped,
254 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
255 You will need a new lynxer.elf file to flash your firmware with - send
256 email to <Martin.Bligh@us.ibm.com>.
258 config X86_SUMMIT
259 bool "Summit/EXA (IBM x440)"
260 depends on X86_32 && SMP
261 help
262 This option is needed for IBM systems that use the Summit/EXA chipset.
263 In particular, it is needed for the x440.
265 If you don't have one of these computers, you should say N here.
266 If you want to build a NUMA kernel, you must select ACPI.
268 config X86_BIGSMP
269 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
270 depends on X86_32 && SMP
271 help
272 This option is needed for the systems that have more than 8 CPUs
273 and if the system is not of any sub-arch type above.
275 If you don't have such a system, you should say N here.
277 config X86_VISWS
278 bool "SGI 320/540 (Visual Workstation)"
279 depends on X86_32
280 help
281 The SGI Visual Workstation series is an IA32-based workstation
282 based on SGI systems chips with some legacy PC hardware attached.
284 Say Y here to create a kernel to run on the SGI 320 or 540.
286 A kernel compiled for the Visual Workstation will not run on PCs
287 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
289 config X86_GENERICARCH
290 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
291 depends on X86_32
292 help
293 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
294 It is intended for a generic binary kernel.
295 If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
297 config X86_ES7000
298 bool "Support for Unisys ES7000 IA32 series"
299 depends on X86_32 && SMP
300 help
301 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
302 supposed to run on an IA32-based Unisys ES7000 system.
303 Only choose this option if you have such a system, otherwise you
304 should say N here.
306 config X86_RDC321X
307 bool "RDC R-321x SoC"
308 depends on X86_32
309 select M486
310 select X86_REBOOTFIXUPS
311 select GENERIC_GPIO
312 select LEDS_CLASS
313 select LEDS_GPIO
314 help
315 This option is needed for RDC R-321x system-on-chip, also known
316 as R-8610-(G).
317 If you don't have one of these chips, you should say N here.
319 config X86_VSMP
320 bool "Support for ScaleMP vSMP"
321 depends on X86_64 && PCI
322 help
323 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
324 supposed to run on these EM64T-based machines. Only choose this option
325 if you have one of these machines.
327 endchoice
329 config SCHED_NO_NO_OMIT_FRAME_POINTER
330 def_bool y
331 prompt "Single-depth WCHAN output"
332 depends on X86_32
333 help
334 Calculate simpler /proc/<PID>/wchan values. If this option
335 is disabled then wchan values will recurse back to the
336 caller function. This provides more accurate wchan values,
337 at the expense of slightly more scheduling overhead.
339 If in doubt, say "Y".
341 menuconfig PARAVIRT_GUEST
342 bool "Paravirtualized guest support"
343 help
344 Say Y here to get to see options related to running Linux under
345 various hypervisors. This option alone does not add any kernel code.
347 If you say N, all options in this submenu will be skipped and disabled.
349 if PARAVIRT_GUEST
351 source "arch/x86/xen/Kconfig"
353 config VMI
354 bool "VMI Guest support"
355 select PARAVIRT
356 depends on X86_32
357 depends on !(X86_VISWS || X86_VOYAGER)
358 help
359 VMI provides a paravirtualized interface to the VMware ESX server
360 (it could be used by other hypervisors in theory too, but is not
361 at the moment), by linking the kernel to a GPL-ed ROM module
362 provided by the hypervisor.
364 source "arch/x86/lguest/Kconfig"
366 config PARAVIRT
367 bool "Enable paravirtualization code"
368 depends on !(X86_VISWS || X86_VOYAGER)
369 help
370 This changes the kernel so it can modify itself when it is run
371 under a hypervisor, potentially improving performance significantly
372 over full virtualization. However, when run without a hypervisor
373 the kernel is theoretically slower and slightly larger.
375 endif
377 config ACPI_SRAT
378 def_bool y
379 depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
380 select ACPI_NUMA
382 config HAVE_ARCH_PARSE_SRAT
383 def_bool y
384 depends on ACPI_SRAT
386 config X86_SUMMIT_NUMA
387 def_bool y
388 depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)
390 config X86_CYCLONE_TIMER
391 def_bool y
392 depends on X86_32 && X86_SUMMIT || X86_GENERICARCH
394 config ES7000_CLUSTERED_APIC
395 def_bool y
396 depends on SMP && X86_ES7000 && MPENTIUMIII
398 source "arch/x86/Kconfig.cpu"
400 config HPET_TIMER
401 def_bool X86_64
402 prompt "HPET Timer Support" if X86_32
403 help
404 Use the IA-PC HPET (High Precision Event Timer) to manage
405 time in preference to the PIT and RTC, if a HPET is
406 present.
407 HPET is the next generation timer replacing legacy 8254s.
408 The HPET provides a stable time base on SMP
409 systems, unlike the TSC, but it is more expensive to access,
410 as it is off-chip. You can find the HPET spec at
411 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
413 You can safely choose Y here. However, HPET will only be
414 activated if the platform and the BIOS support this feature.
415 Otherwise the 8254 will be used for timing services.
417 Choose N to continue using the legacy 8254 timer.
419 config HPET_EMULATE_RTC
420 def_bool y
421 depends on HPET_TIMER && (RTC=y || RTC=m)
423 # Mark as embedded because too many people got it wrong.
424 # The code disables itself when not needed.
425 config GART_IOMMU
426 bool "GART IOMMU support" if EMBEDDED
427 default y
428 select SWIOTLB
429 select AGP
430 depends on X86_64 && PCI
431 help
432 Support for full DMA access of devices with 32bit memory access only
433 on systems with more than 3GB. This is usually needed for USB,
434 sound, many IDE/SATA chipsets and some other devices.
435 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
436 based hardware IOMMU and a software bounce buffer based IOMMU used
437 on Intel systems and as fallback.
438 The code is only active when needed (enough memory and limited
439 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
440 too.
442 config CALGARY_IOMMU
443 bool "IBM Calgary IOMMU support"
444 select SWIOTLB
445 depends on X86_64 && PCI && EXPERIMENTAL
446 help
447 Support for hardware IOMMUs in IBM's xSeries x366 and x460
448 systems. Needed to run systems with more than 3GB of memory
449 properly with 32-bit PCI devices that do not support DAC
450 (Double Address Cycle). Calgary also supports bus level
451 isolation, where all DMAs pass through the IOMMU. This
452 prevents them from going anywhere except their intended
453 destination. This catches hard-to-find kernel bugs and
454 mis-behaving drivers and devices that do not use the DMA-API
455 properly to set up their DMA buffers. The IOMMU can be
456 turned off at boot time with the iommu=off parameter.
457 Normally the kernel will make the right choice by itself.
458 If unsure, say Y.
460 config CALGARY_IOMMU_ENABLED_BY_DEFAULT
461 def_bool y
462 prompt "Should Calgary be enabled by default?"
463 depends on CALGARY_IOMMU
464 help
465 Should Calgary be enabled by default? if you choose 'y', Calgary
466 will be used (if it exists). If you choose 'n', Calgary will not be
467 used even if it exists. If you choose 'n' and would like to use
468 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
469 If unsure, say Y.
471 # need this always selected by IOMMU for the VIA workaround
472 config SWIOTLB
473 bool
474 help
475 Support for software bounce buffers used on x86-64 systems
476 which don't have a hardware IOMMU (e.g. the current generation
477 of Intel's x86-64 CPUs). Using this PCI devices which can only
478 access 32-bits of memory can be used on systems with more than
479 3 GB of memory. If unsure, say Y.
482 config NR_CPUS
483 int "Maximum number of CPUs (2-255)"
484 range 2 255
485 depends on SMP
486 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
487 default "8"
488 help
489 This allows you to specify the maximum number of CPUs which this
490 kernel will support. The maximum supported value is 255 and the
491 minimum value which makes sense is 2.
493 This is purely to save memory - each supported CPU adds
494 approximately eight kilobytes to the kernel image.
496 config SCHED_SMT
497 bool "SMT (Hyperthreading) scheduler support"
498 depends on (X86_64 && SMP) || (X86_32 && X86_HT)
499 help
500 SMT scheduler support improves the CPU scheduler's decision making
501 when dealing with Intel Pentium 4 chips with HyperThreading at a
502 cost of slightly increased overhead in some places. If unsure say
503 N here.
505 config SCHED_MC
506 def_bool y
507 prompt "Multi-core scheduler support"
508 depends on (X86_64 && SMP) || (X86_32 && X86_HT)
509 help
510 Multi-core scheduler support improves the CPU scheduler's decision
511 making when dealing with multi-core CPU chips at a cost of slightly
512 increased overhead in some places. If unsure say N here.
514 source "kernel/Kconfig.preempt"
516 config X86_UP_APIC
517 bool "Local APIC support on uniprocessors"
518 depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
519 help
520 A local APIC (Advanced Programmable Interrupt Controller) is an
521 integrated interrupt controller in the CPU. If you have a single-CPU
522 system which has a processor with a local APIC, you can say Y here to
523 enable and use it. If you say Y here even though your machine doesn't
524 have a local APIC, then the kernel will still run with no slowdown at
525 all. The local APIC supports CPU-generated self-interrupts (timer,
526 performance counters), and the NMI watchdog which detects hard
527 lockups.
529 config X86_UP_IOAPIC
530 bool "IO-APIC support on uniprocessors"
531 depends on X86_UP_APIC
532 help
533 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
534 SMP-capable replacement for PC-style interrupt controllers. Most
535 SMP systems and many recent uniprocessor systems have one.
537 If you have a single-CPU system with an IO-APIC, you can say Y here
538 to use it. If you say Y here even though your machine doesn't have
539 an IO-APIC, then the kernel will still run with no slowdown at all.
541 config X86_LOCAL_APIC
542 def_bool y
543 depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))
545 config X86_IO_APIC
546 def_bool y
547 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))
549 config X86_VISWS_APIC
550 def_bool y
551 depends on X86_32 && X86_VISWS
553 config X86_MCE
554 bool "Machine Check Exception"
555 depends on !X86_VOYAGER
556 ---help---
557 Machine Check Exception support allows the processor to notify the
558 kernel if it detects a problem (e.g. overheating, component failure).
559 The action the kernel takes depends on the severity of the problem,
560 ranging from a warning message on the console, to halting the machine.
561 Your processor must be a Pentium or newer to support this - check the
562 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
563 have a design flaw which leads to false MCE events - hence MCE is
564 disabled on all P5 processors, unless explicitly enabled with "mce"
565 as a boot argument. Similarly, if MCE is built in and creates a
566 problem on some new non-standard machine, you can boot with "nomce"
567 to disable it. MCE support simply ignores non-MCE processors like
568 the 386 and 486, so nearly everyone can say Y here.
570 config X86_MCE_INTEL
571 def_bool y
572 prompt "Intel MCE features"
573 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
574 help
575 Additional support for intel specific MCE features such as
576 the thermal monitor.
578 config X86_MCE_AMD
579 def_bool y
580 prompt "AMD MCE features"
581 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
582 help
583 Additional support for AMD specific MCE features such as
584 the DRAM Error Threshold.
586 config X86_MCE_NONFATAL
587 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
588 depends on X86_32 && X86_MCE
589 help
590 Enabling this feature starts a timer that triggers every 5 seconds which
591 will look at the machine check registers to see if anything happened.
592 Non-fatal problems automatically get corrected (but still logged).
593 Disable this if you don't want to see these messages.
594 Seeing the messages this option prints out may be indicative of dying
595 or out-of-spec (ie, overclocked) hardware.
596 This option only does something on certain CPUs.
597 (AMD Athlon/Duron and Intel Pentium 4)
599 config X86_MCE_P4THERMAL
600 bool "check for P4 thermal throttling interrupt."
601 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
602 help
603 Enabling this feature will cause a message to be printed when the P4
604 enters thermal throttling.
606 config VM86
607 bool "Enable VM86 support" if EMBEDDED
608 default y
609 depends on X86_32
610 help
611 This option is required by programs like DOSEMU to run 16-bit legacy
612 code on X86 processors. It also may be needed by software like
613 XFree86 to initialize some video cards via BIOS. Disabling this
614 option saves about 6k.
616 config TOSHIBA
617 tristate "Toshiba Laptop support"
618 depends on X86_32
619 ---help---
620 This adds a driver to safely access the System Management Mode of
621 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
622 not work on models with a Phoenix BIOS. The System Management Mode
623 is used to set the BIOS and power saving options on Toshiba portables.
625 For information on utilities to make use of this driver see the
626 Toshiba Linux utilities web site at:
627 <http://www.buzzard.org.uk/toshiba/>.
629 Say Y if you intend to run this kernel on a Toshiba portable.
630 Say N otherwise.
632 config I8K
633 tristate "Dell laptop support"
634 depends on X86_32
635 ---help---
636 This adds a driver to safely access the System Management Mode
637 of the CPU on the Dell Inspiron 8000. The System Management Mode
638 is used to read cpu temperature and cooling fan status and to
639 control the fans on the I8K portables.
641 This driver has been tested only on the Inspiron 8000 but it may
642 also work with other Dell laptops. You can force loading on other
643 models by passing the parameter `force=1' to the module. Use at
644 your own risk.
646 For information on utilities to make use of this driver see the
647 I8K Linux utilities web site at:
648 <http://people.debian.org/~dz/i8k/>
650 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
651 Say N otherwise.
653 config X86_REBOOTFIXUPS
654 def_bool n
655 prompt "Enable X86 board specific fixups for reboot"
656 depends on X86_32 && X86
657 ---help---
658 This enables chipset and/or board specific fixups to be done
659 in order to get reboot to work correctly. This is only needed on
660 some combinations of hardware and BIOS. The symptom, for which
661 this config is intended, is when reboot ends with a stalled/hung
662 system.
664 Currently, the only fixup is for the Geode machines using
665 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
667 Say Y if you want to enable the fixup. Currently, it's safe to
668 enable this option even if you don't need it.
669 Say N otherwise.
671 config MICROCODE
672 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
673 select FW_LOADER
674 ---help---
675 If you say Y here, you will be able to update the microcode on
676 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
677 Pentium III, Pentium 4, Xeon etc. You will obviously need the
678 actual microcode binary data itself which is not shipped with the
679 Linux kernel.
681 For latest news and information on obtaining all the required
682 ingredients for this driver, check:
683 <http://www.urbanmyth.org/microcode/>.
685 To compile this driver as a module, choose M here: the
686 module will be called microcode.
688 config MICROCODE_OLD_INTERFACE
689 def_bool y
690 depends on MICROCODE
692 config X86_MSR
693 tristate "/dev/cpu/*/msr - Model-specific register support"
694 help
695 This device gives privileged processes access to the x86
696 Model-Specific Registers (MSRs). It is a character device with
697 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
698 MSR accesses are directed to a specific CPU on multi-processor
699 systems.
701 config X86_CPUID
702 tristate "/dev/cpu/*/cpuid - CPU information support"
703 help
704 This device gives processes access to the x86 CPUID instruction to
705 be executed on a specific processor. It is a character device
706 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
707 /dev/cpu/31/cpuid.
709 choice
710 prompt "High Memory Support"
711 default HIGHMEM4G if !X86_NUMAQ
712 default HIGHMEM64G if X86_NUMAQ
713 depends on X86_32
715 config NOHIGHMEM
716 bool "off"
717 depends on !X86_NUMAQ
718 ---help---
719 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
720 However, the address space of 32-bit x86 processors is only 4
721 Gigabytes large. That means that, if you have a large amount of
722 physical memory, not all of it can be "permanently mapped" by the
723 kernel. The physical memory that's not permanently mapped is called
724 "high memory".
726 If you are compiling a kernel which will never run on a machine with
727 more than 1 Gigabyte total physical RAM, answer "off" here (default
728 choice and suitable for most users). This will result in a "3GB/1GB"
729 split: 3GB are mapped so that each process sees a 3GB virtual memory
730 space and the remaining part of the 4GB virtual memory space is used
731 by the kernel to permanently map as much physical memory as
732 possible.
734 If the machine has between 1 and 4 Gigabytes physical RAM, then
735 answer "4GB" here.
737 If more than 4 Gigabytes is used then answer "64GB" here. This
738 selection turns Intel PAE (Physical Address Extension) mode on.
739 PAE implements 3-level paging on IA32 processors. PAE is fully
740 supported by Linux, PAE mode is implemented on all recent Intel
741 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
742 then the kernel will not boot on CPUs that don't support PAE!
744 The actual amount of total physical memory will either be
745 auto detected or can be forced by using a kernel command line option
746 such as "mem=256M". (Try "man bootparam" or see the documentation of
747 your boot loader (lilo or loadlin) about how to pass options to the
748 kernel at boot time.)
750 If unsure, say "off".
752 config HIGHMEM4G
753 bool "4GB"
754 depends on !X86_NUMAQ
755 help
756 Select this if you have a 32-bit processor and between 1 and 4
757 gigabytes of physical RAM.
759 config HIGHMEM64G
760 bool "64GB"
761 depends on !M386 && !M486
762 select X86_PAE
763 help
764 Select this if you have a 32-bit processor and more than 4
765 gigabytes of physical RAM.
767 endchoice
769 choice
770 depends on EXPERIMENTAL
771 prompt "Memory split" if EMBEDDED
772 default VMSPLIT_3G
773 depends on X86_32
774 help
775 Select the desired split between kernel and user memory.
777 If the address range available to the kernel is less than the
778 physical memory installed, the remaining memory will be available
779 as "high memory". Accessing high memory is a little more costly
780 than low memory, as it needs to be mapped into the kernel first.
781 Note that increasing the kernel address space limits the range
782 available to user programs, making the address space there
783 tighter. Selecting anything other than the default 3G/1G split
784 will also likely make your kernel incompatible with binary-only
785 kernel modules.
787 If you are not absolutely sure what you are doing, leave this
788 option alone!
790 config VMSPLIT_3G
791 bool "3G/1G user/kernel split"
792 config VMSPLIT_3G_OPT
793 depends on !X86_PAE
794 bool "3G/1G user/kernel split (for full 1G low memory)"
795 config VMSPLIT_2G
796 bool "2G/2G user/kernel split"
797 config VMSPLIT_2G_OPT
798 depends on !X86_PAE
799 bool "2G/2G user/kernel split (for full 2G low memory)"
800 config VMSPLIT_1G
801 bool "1G/3G user/kernel split"
802 endchoice
804 config PAGE_OFFSET
805 hex
806 default 0xB0000000 if VMSPLIT_3G_OPT
807 default 0x80000000 if VMSPLIT_2G
808 default 0x78000000 if VMSPLIT_2G_OPT
809 default 0x40000000 if VMSPLIT_1G
810 default 0xC0000000
811 depends on X86_32
813 config HIGHMEM
814 def_bool y
815 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
817 config X86_PAE
818 def_bool n
819 prompt "PAE (Physical Address Extension) Support"
820 depends on X86_32 && !HIGHMEM4G
821 select RESOURCES_64BIT
822 help
823 PAE is required for NX support, and furthermore enables
824 larger swapspace support for non-overcommit purposes. It
825 has the cost of more pagetable lookup overhead, and also
826 consumes more pagetable space per process.
828 # Common NUMA Features
829 config NUMA
830 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
831 depends on SMP
832 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
833 default n if X86_PC
834 default y if (X86_NUMAQ || X86_SUMMIT)
835 help
836 Enable NUMA (Non Uniform Memory Access) support.
837 The kernel will try to allocate memory used by a CPU on the
838 local memory controller of the CPU and add some more
839 NUMA awareness to the kernel.
841 For i386 this is currently highly experimental and should be only
842 used for kernel development. It might also cause boot failures.
843 For x86_64 this is recommended on all multiprocessor Opteron systems.
844 If the system is EM64T, you should say N unless your system is
845 EM64T NUMA.
847 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
848 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
850 config K8_NUMA
851 def_bool y
852 prompt "Old style AMD Opteron NUMA detection"
853 depends on X86_64 && NUMA && PCI
854 help
855 Enable K8 NUMA node topology detection. You should say Y here if
856 you have a multi processor AMD K8 system. This uses an old
857 method to read the NUMA configuration directly from the builtin
858 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
859 instead, which also takes priority if both are compiled in.
861 config X86_64_ACPI_NUMA
862 def_bool y
863 prompt "ACPI NUMA detection"
864 depends on X86_64 && NUMA && ACPI && PCI
865 select ACPI_NUMA
866 help
867 Enable ACPI SRAT based node topology detection.
869 config NUMA_EMU
870 bool "NUMA emulation"
871 depends on X86_64 && NUMA
872 help
873 Enable NUMA emulation. A flat machine will be split
874 into virtual nodes when booted with "numa=fake=N", where N is the
875 number of nodes. This is only useful for debugging.
877 config NODES_SHIFT
878 int
879 range 1 15 if X86_64
880 default "6" if X86_64
881 default "4" if X86_NUMAQ
882 default "3"
883 depends on NEED_MULTIPLE_NODES
885 config HAVE_ARCH_BOOTMEM_NODE
886 def_bool y
887 depends on X86_32 && NUMA
889 config ARCH_HAVE_MEMORY_PRESENT
890 def_bool y
891 depends on X86_32 && DISCONTIGMEM
893 config NEED_NODE_MEMMAP_SIZE
894 def_bool y
895 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
897 config HAVE_ARCH_ALLOC_REMAP
898 def_bool y
899 depends on X86_32 && NUMA
901 config ARCH_FLATMEM_ENABLE
902 def_bool y
903 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
905 config ARCH_DISCONTIGMEM_ENABLE
906 def_bool y
907 depends on NUMA && X86_32
909 config ARCH_DISCONTIGMEM_DEFAULT
910 def_bool y
911 depends on NUMA && X86_32
913 config ARCH_SPARSEMEM_DEFAULT
914 def_bool y
915 depends on X86_64
917 config ARCH_SPARSEMEM_ENABLE
918 def_bool y
919 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
920 select SPARSEMEM_STATIC if X86_32
921 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
923 config ARCH_SELECT_MEMORY_MODEL
924 def_bool y
925 depends on ARCH_SPARSEMEM_ENABLE
927 config ARCH_MEMORY_PROBE
928 def_bool X86_64
929 depends on MEMORY_HOTPLUG
931 source "mm/Kconfig"
933 config HIGHPTE
934 bool "Allocate 3rd-level pagetables from highmem"
935 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
936 help
937 The VM uses one page table entry for each page of physical memory.
938 For systems with a lot of RAM, this can be wasteful of precious
939 low memory. Setting this option will put user-space page table
940 entries in high memory.
942 config MATH_EMULATION
943 bool
944 prompt "Math emulation" if X86_32
945 ---help---
946 Linux can emulate a math coprocessor (used for floating point
947 operations) if you don't have one. 486DX and Pentium processors have
948 a math coprocessor built in, 486SX and 386 do not, unless you added
949 a 487DX or 387, respectively. (The messages during boot time can
950 give you some hints here ["man dmesg"].) Everyone needs either a
951 coprocessor or this emulation.
953 If you don't have a math coprocessor, you need to say Y here; if you
954 say Y here even though you have a coprocessor, the coprocessor will
955 be used nevertheless. (This behavior can be changed with the kernel
956 command line option "no387", which comes handy if your coprocessor
957 is broken. Try "man bootparam" or see the documentation of your boot
958 loader (lilo or loadlin) about how to pass options to the kernel at
959 boot time.) This means that it is a good idea to say Y here if you
960 intend to use this kernel on different machines.
962 More information about the internals of the Linux math coprocessor
963 emulation can be found in <file:arch/x86/math-emu/README>.
965 If you are not sure, say Y; apart from resulting in a 66 KB bigger
966 kernel, it won't hurt.
968 config MTRR
969 bool "MTRR (Memory Type Range Register) support"
970 ---help---
971 On Intel P6 family processors (Pentium Pro, Pentium II and later)
972 the Memory Type Range Registers (MTRRs) may be used to control
973 processor access to memory ranges. This is most useful if you have
974 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
975 allows bus write transfers to be combined into a larger transfer
976 before bursting over the PCI/AGP bus. This can increase performance
977 of image write operations 2.5 times or more. Saying Y here creates a
978 /proc/mtrr file which may be used to manipulate your processor's
979 MTRRs. Typically the X server should use this.
981 This code has a reasonably generic interface so that similar
982 control registers on other processors can be easily supported
983 as well:
985 The Cyrix 6x86, 6x86MX and M II processors have Address Range
986 Registers (ARRs) which provide a similar functionality to MTRRs. For
987 these, the ARRs are used to emulate the MTRRs.
988 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
989 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
990 write-combining. All of these processors are supported by this code
991 and it makes sense to say Y here if you have one of them.
993 Saying Y here also fixes a problem with buggy SMP BIOSes which only
994 set the MTRRs for the boot CPU and not for the secondary CPUs. This
995 can lead to all sorts of problems, so it's good to say Y here.
997 You can safely say Y even if your machine doesn't have MTRRs, you'll
998 just add about 9 KB to your kernel.
1000 See <file:Documentation/mtrr.txt> for more information.
1002 config EFI
1003 def_bool n
1004 prompt "EFI runtime service support"
1005 depends on ACPI
1006 ---help---
1007 This enables the kernel to use EFI runtime services that are
1008 available (such as the EFI variable services).
1010 This option is only useful on systems that have EFI firmware.
1011 In addition, you should use the latest ELILO loader available
1012 at <http://elilo.sourceforge.net> in order to take advantage
1013 of EFI runtime services. However, even with this option, the
1014 resultant kernel should continue to boot on existing non-EFI
1015 platforms.
1017 config IRQBALANCE
1018 def_bool y
1019 prompt "Enable kernel irq balancing"
1020 depends on X86_32 && SMP && X86_IO_APIC
1021 help
1022 The default yes will allow the kernel to do irq load balancing.
1023 Saying no will keep the kernel from doing irq load balancing.
1025 config SECCOMP
1026 def_bool y
1027 prompt "Enable seccomp to safely compute untrusted bytecode"
1028 depends on PROC_FS
1029 help
1030 This kernel feature is useful for number crunching applications
1031 that may need to compute untrusted bytecode during their
1032 execution. By using pipes or other transports made available to
1033 the process as file descriptors supporting the read/write
1034 syscalls, it's possible to isolate those applications in
1035 their own address space using seccomp. Once seccomp is
1036 enabled via /proc/<pid>/seccomp, it cannot be disabled
1037 and the task is only allowed to execute a few safe syscalls
1038 defined by each seccomp mode.
1040 If unsure, say Y. Only embedded should say N here.
1042 config CC_STACKPROTECTOR
1043 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1044 depends on X86_64 && EXPERIMENTAL
1045 help
1046 This option turns on the -fstack-protector GCC feature. This
1047 feature puts, at the beginning of critical functions, a canary
1048 value on the stack just before the return address, and validates
1049 the value just before actually returning. Stack based buffer
1050 overflows (that need to overwrite this return address) now also
1051 overwrite the canary, which gets detected and the attack is then
1052 neutralized via a kernel panic.
1054 This feature requires gcc version 4.2 or above, or a distribution
1055 gcc with the feature backported. Older versions are automatically
1056 detected and for those versions, this configuration option is ignored.
1058 config CC_STACKPROTECTOR_ALL
1059 bool "Use stack-protector for all functions"
1060 depends on CC_STACKPROTECTOR
1061 help
1062 Normally, GCC only inserts the canary value protection for
1063 functions that use large-ish on-stack buffers. By enabling
1064 this option, GCC will be asked to do this for ALL functions.
1066 source kernel/Kconfig.hz
1068 config KEXEC
1069 bool "kexec system call"
1070 help
1071 kexec is a system call that implements the ability to shutdown your
1072 current kernel, and to start another kernel. It is like a reboot
1073 but it is independent of the system firmware. And like a reboot
1074 you can start any kernel with it, not just Linux.
1076 The name comes from the similarity to the exec system call.
1078 It is an ongoing process to be certain the hardware in a machine
1079 is properly shutdown, so do not be surprised if this code does not
1080 initially work for you. It may help to enable device hotplugging
1081 support. As of this writing the exact hardware interface is
1082 strongly in flux, so no good recommendation can be made.
1084 config CRASH_DUMP
1085 bool "kernel crash dumps (EXPERIMENTAL)"
1086 depends on EXPERIMENTAL
1087 depends on X86_64 || (X86_32 && HIGHMEM)
1088 help
1089 Generate crash dump after being started by kexec.
1090 This should be normally only set in special crash dump kernels
1091 which are loaded in the main kernel with kexec-tools into
1092 a specially reserved region and then later executed after
1093 a crash by kdump/kexec. The crash dump kernel must be compiled
1094 to a memory address not used by the main kernel or BIOS using
1095 PHYSICAL_START, or it must be built as a relocatable image
1096 (CONFIG_RELOCATABLE=y).
1097 For more details see Documentation/kdump/kdump.txt
1099 config PHYSICAL_START
1100 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1101 default "0x1000000" if X86_NUMAQ
1102 default "0x200000" if X86_64
1103 default "0x100000"
1104 help
1105 This gives the physical address where the kernel is loaded.
1107 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1108 bzImage will decompress itself to above physical address and
1109 run from there. Otherwise, bzImage will run from the address where
1110 it has been loaded by the boot loader and will ignore above physical
1111 address.
1113 In normal kdump cases one does not have to set/change this option
1114 as now bzImage can be compiled as a completely relocatable image
1115 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1116 address. This option is mainly useful for the folks who don't want
1117 to use a bzImage for capturing the crash dump and want to use a
1118 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1119 to be specifically compiled to run from a specific memory area
1120 (normally a reserved region) and this option comes handy.
1122 So if you are using bzImage for capturing the crash dump, leave
1123 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1124 Otherwise if you plan to use vmlinux for capturing the crash dump
1125 change this value to start of the reserved region (Typically 16MB
1126 0x1000000). In other words, it can be set based on the "X" value as
1127 specified in the "crashkernel=YM@XM" command line boot parameter
1128 passed to the panic-ed kernel. Typically this parameter is set as
1129 crashkernel=64M@16M. Please take a look at
1130 Documentation/kdump/kdump.txt for more details about crash dumps.
1132 Usage of bzImage for capturing the crash dump is recommended as
1133 one does not have to build two kernels. Same kernel can be used
1134 as production kernel and capture kernel. Above option should have
1135 gone away after relocatable bzImage support is introduced. But it
1136 is present because there are users out there who continue to use
1137 vmlinux for dump capture. This option should go away down the
1138 line.
1140 Don't change this unless you know what you are doing.
1142 config RELOCATABLE
1143 bool "Build a relocatable kernel (EXPERIMENTAL)"
1144 depends on EXPERIMENTAL
1145 help
1146 This builds a kernel image that retains relocation information
1147 so it can be loaded someplace besides the default 1MB.
1148 The relocations tend to make the kernel binary about 10% larger,
1149 but are discarded at runtime.
1151 One use is for the kexec on panic case where the recovery kernel
1152 must live at a different physical address than the primary
1153 kernel.
1155 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1156 it has been loaded at and the compile time physical address
1157 (CONFIG_PHYSICAL_START) is ignored.
1159 config PHYSICAL_ALIGN
1160 hex
1161 prompt "Alignment value to which kernel should be aligned" if X86_32
1162 default "0x100000" if X86_32
1163 default "0x200000" if X86_64
1164 range 0x2000 0x400000
1165 help
1166 This value puts the alignment restrictions on physical address
1167 where kernel is loaded and run from. Kernel is compiled for an
1168 address which meets above alignment restriction.
1170 If bootloader loads the kernel at a non-aligned address and
1171 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1172 address aligned to above value and run from there.
1174 If bootloader loads the kernel at a non-aligned address and
1175 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1176 load address and decompress itself to the address it has been
1177 compiled for and run from there. The address for which kernel is
1178 compiled already meets above alignment restrictions. Hence the
1179 end result is that kernel runs from a physical address meeting
1180 above alignment restrictions.
1182 Don't change this unless you know what you are doing.
1184 config HOTPLUG_CPU
1185 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1186 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1187 ---help---
1188 Say Y here to experiment with turning CPUs off and on, and to
1189 enable suspend on SMP systems. CPUs can be controlled through
1190 /sys/devices/system/cpu.
1191 Say N if you want to disable CPU hotplug and don't need to
1192 suspend.
1194 config COMPAT_VDSO
1195 def_bool y
1196 prompt "Compat VDSO support"
1197 depends on X86_32 || IA32_EMULATION
1198 help
1199 Map the 32-bit VDSO to the predictable old-style address too.
1200 ---help---
1201 Say N here if you are running a sufficiently recent glibc
1202 version (2.3.3 or later), to remove the high-mapped
1203 VDSO mapping and to exclusively use the randomized VDSO.
1205 If unsure, say Y.
1207 endmenu
1209 config ARCH_ENABLE_MEMORY_HOTPLUG
1210 def_bool y
1211 depends on X86_64 || (X86_32 && HIGHMEM)
1213 config HAVE_ARCH_EARLY_PFN_TO_NID
1214 def_bool X86_64
1215 depends on NUMA
1217 menu "Power management options"
1218 depends on !X86_VOYAGER
1220 config ARCH_HIBERNATION_HEADER
1221 def_bool y
1222 depends on X86_64 && HIBERNATION
1224 source "kernel/power/Kconfig"
1226 source "drivers/acpi/Kconfig"
1228 config X86_APM_BOOT
1229 bool
1230 default y
1231 depends on APM || APM_MODULE
1233 menuconfig APM
1234 tristate "APM (Advanced Power Management) BIOS support"
1235 depends on X86_32 && PM_SLEEP && !X86_VISWS
1236 ---help---
1237 APM is a BIOS specification for saving power using several different
1238 techniques. This is mostly useful for battery powered laptops with
1239 APM compliant BIOSes. If you say Y here, the system time will be
1240 reset after a RESUME operation, the /proc/apm device will provide
1241 battery status information, and user-space programs will receive
1242 notification of APM "events" (e.g. battery status change).
1244 If you select "Y" here, you can disable actual use of the APM
1245 BIOS by passing the "apm=off" option to the kernel at boot time.
1247 Note that the APM support is almost completely disabled for
1248 machines with more than one CPU.
1250 In order to use APM, you will need supporting software. For location
1251 and more information, read <file:Documentation/pm.txt> and the
1252 Battery Powered Linux mini-HOWTO, available from
1253 <http://www.tldp.org/docs.html#howto>.
1255 This driver does not spin down disk drives (see the hdparm(8)
1256 manpage ("man 8 hdparm") for that), and it doesn't turn off
1257 VESA-compliant "green" monitors.
1259 This driver does not support the TI 4000M TravelMate and the ACER
1260 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1261 desktop machines also don't have compliant BIOSes, and this driver
1262 may cause those machines to panic during the boot phase.
1264 Generally, if you don't have a battery in your machine, there isn't
1265 much point in using this driver and you should say N. If you get
1266 random kernel OOPSes or reboots that don't seem to be related to
1267 anything, try disabling/enabling this option (or disabling/enabling
1268 APM in your BIOS).
1270 Some other things you should try when experiencing seemingly random,
1271 "weird" problems:
1273 1) make sure that you have enough swap space and that it is
1274 enabled.
1275 2) pass the "no-hlt" option to the kernel
1276 3) switch on floating point emulation in the kernel and pass
1277 the "no387" option to the kernel
1278 4) pass the "floppy=nodma" option to the kernel
1279 5) pass the "mem=4M" option to the kernel (thereby disabling
1280 all but the first 4 MB of RAM)
1281 6) make sure that the CPU is not over clocked.
1282 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1283 8) disable the cache from your BIOS settings
1284 9) install a fan for the video card or exchange video RAM
1285 10) install a better fan for the CPU
1286 11) exchange RAM chips
1287 12) exchange the motherboard.
1289 To compile this driver as a module, choose M here: the
1290 module will be called apm.
1292 if APM
1294 config APM_IGNORE_USER_SUSPEND
1295 bool "Ignore USER SUSPEND"
1296 help
1297 This option will ignore USER SUSPEND requests. On machines with a
1298 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1299 series notebooks, it is necessary to say Y because of a BIOS bug.
1301 config APM_DO_ENABLE
1302 bool "Enable PM at boot time"
1303 ---help---
1304 Enable APM features at boot time. From page 36 of the APM BIOS
1305 specification: "When disabled, the APM BIOS does not automatically
1306 power manage devices, enter the Standby State, enter the Suspend
1307 State, or take power saving steps in response to CPU Idle calls."
1308 This driver will make CPU Idle calls when Linux is idle (unless this
1309 feature is turned off -- see "Do CPU IDLE calls", below). This
1310 should always save battery power, but more complicated APM features
1311 will be dependent on your BIOS implementation. You may need to turn
1312 this option off if your computer hangs at boot time when using APM
1313 support, or if it beeps continuously instead of suspending. Turn
1314 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1315 T400CDT. This is off by default since most machines do fine without
1316 this feature.
1318 config APM_CPU_IDLE
1319 bool "Make CPU Idle calls when idle"
1320 help
1321 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1322 On some machines, this can activate improved power savings, such as
1323 a slowed CPU clock rate, when the machine is idle. These idle calls
1324 are made after the idle loop has run for some length of time (e.g.,
1325 333 mS). On some machines, this will cause a hang at boot time or
1326 whenever the CPU becomes idle. (On machines with more than one CPU,
1327 this option does nothing.)
1329 config APM_DISPLAY_BLANK
1330 bool "Enable console blanking using APM"
1331 help
1332 Enable console blanking using the APM. Some laptops can use this to
1333 turn off the LCD backlight when the screen blanker of the Linux
1334 virtual console blanks the screen. Note that this is only used by
1335 the virtual console screen blanker, and won't turn off the backlight
1336 when using the X Window system. This also doesn't have anything to
1337 do with your VESA-compliant power-saving monitor. Further, this
1338 option doesn't work for all laptops -- it might not turn off your
1339 backlight at all, or it might print a lot of errors to the console,
1340 especially if you are using gpm.
1342 config APM_ALLOW_INTS
1343 bool "Allow interrupts during APM BIOS calls"
1344 help
1345 Normally we disable external interrupts while we are making calls to
1346 the APM BIOS as a measure to lessen the effects of a badly behaving
1347 BIOS implementation. The BIOS should reenable interrupts if it
1348 needs to. Unfortunately, some BIOSes do not -- especially those in
1349 many of the newer IBM Thinkpads. If you experience hangs when you
1350 suspend, try setting this to Y. Otherwise, say N.
1352 config APM_REAL_MODE_POWER_OFF
1353 bool "Use real mode APM BIOS call to power off"
1354 help
1355 Use real mode APM BIOS calls to switch off the computer. This is
1356 a work-around for a number of buggy BIOSes. Switch this option on if
1357 your computer crashes instead of powering off properly.
1359 endif # APM
1361 source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1363 source "drivers/cpuidle/Kconfig"
1365 endmenu
1368 menu "Bus options (PCI etc.)"
1370 config PCI
1371 bool "PCI support" if !X86_VISWS
1372 depends on !X86_VOYAGER
1373 default y
1374 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1375 help
1376 Find out whether you have a PCI motherboard. PCI is the name of a
1377 bus system, i.e. the way the CPU talks to the other stuff inside
1378 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1379 VESA. If you have PCI, say Y, otherwise N.
1381 choice
1382 prompt "PCI access mode"
1383 depends on X86_32 && PCI && !X86_VISWS
1384 default PCI_GOANY
1385 ---help---
1386 On PCI systems, the BIOS can be used to detect the PCI devices and
1387 determine their configuration. However, some old PCI motherboards
1388 have BIOS bugs and may crash if this is done. Also, some embedded
1389 PCI-based systems don't have any BIOS at all. Linux can also try to
1390 detect the PCI hardware directly without using the BIOS.
1392 With this option, you can specify how Linux should detect the
1393 PCI devices. If you choose "BIOS", the BIOS will be used,
1394 if you choose "Direct", the BIOS won't be used, and if you
1395 choose "MMConfig", then PCI Express MMCONFIG will be used.
1396 If you choose "Any", the kernel will try MMCONFIG, then the
1397 direct access method and falls back to the BIOS if that doesn't
1398 work. If unsure, go with the default, which is "Any".
1400 config PCI_GOBIOS
1401 bool "BIOS"
1403 config PCI_GOMMCONFIG
1404 bool "MMConfig"
1406 config PCI_GODIRECT
1407 bool "Direct"
1409 config PCI_GOANY
1410 bool "Any"
1412 endchoice
1414 config PCI_BIOS
1415 def_bool y
1416 depends on X86_32 && !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1418 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1419 config PCI_DIRECT
1420 def_bool y
1421 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
1423 config PCI_MMCONFIG
1424 def_bool y
1425 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
1427 config PCI_DOMAINS
1428 def_bool y
1429 depends on PCI
1431 config PCI_MMCONFIG
1432 bool "Support mmconfig PCI config space access"
1433 depends on X86_64 && PCI && ACPI
1435 config DMAR
1436 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1437 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1438 help
1439 DMA remapping (DMAR) devices support enables independent address
1440 translations for Direct Memory Access (DMA) from devices.
1441 These DMA remapping devices are reported via ACPI tables
1442 and include PCI device scope covered by these DMA
1443 remapping devices.
1445 config DMAR_GFX_WA
1446 def_bool y
1447 prompt "Support for Graphics workaround"
1448 depends on DMAR
1449 help
1450 Current Graphics drivers tend to use physical address
1451 for DMA and avoid using DMA APIs. Setting this config
1452 option permits the IOMMU driver to set a unity map for
1453 all the OS-visible memory. Hence the driver can continue
1454 to use physical addresses for DMA.
1456 config DMAR_FLOPPY_WA
1457 def_bool y
1458 depends on DMAR
1459 help
1460 Floppy disk drivers are know to bypass DMA API calls
1461 thereby failing to work when IOMMU is enabled. This
1462 workaround will setup a 1:1 mapping for the first
1463 16M to make floppy (an ISA device) work.
1465 source "drivers/pci/pcie/Kconfig"
1467 source "drivers/pci/Kconfig"
1469 # x86_64 have no ISA slots, but do have ISA-style DMA.
1470 config ISA_DMA_API
1471 def_bool y
1473 if X86_32
1475 config ISA
1476 bool "ISA support"
1477 depends on !(X86_VOYAGER || X86_VISWS)
1478 help
1479 Find out whether you have ISA slots on your motherboard. ISA is the
1480 name of a bus system, i.e. the way the CPU talks to the other stuff
1481 inside your box. Other bus systems are PCI, EISA, MicroChannel
1482 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1483 newer boards don't support it. If you have ISA, say Y, otherwise N.
1485 config EISA
1486 bool "EISA support"
1487 depends on ISA
1488 ---help---
1489 The Extended Industry Standard Architecture (EISA) bus was
1490 developed as an open alternative to the IBM MicroChannel bus.
1492 The EISA bus provided some of the features of the IBM MicroChannel
1493 bus while maintaining backward compatibility with cards made for
1494 the older ISA bus. The EISA bus saw limited use between 1988 and
1495 1995 when it was made obsolete by the PCI bus.
1497 Say Y here if you are building a kernel for an EISA-based machine.
1499 Otherwise, say N.
1501 source "drivers/eisa/Kconfig"
1503 config MCA
1504 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1505 default y if X86_VOYAGER
1506 help
1507 MicroChannel Architecture is found in some IBM PS/2 machines and
1508 laptops. It is a bus system similar to PCI or ISA. See
1509 <file:Documentation/mca.txt> (and especially the web page given
1510 there) before attempting to build an MCA bus kernel.
1512 source "drivers/mca/Kconfig"
1514 config SCx200
1515 tristate "NatSemi SCx200 support"
1516 depends on !X86_VOYAGER
1517 help
1518 This provides basic support for National Semiconductor's
1519 (now AMD's) Geode processors. The driver probes for the
1520 PCI-IDs of several on-chip devices, so its a good dependency
1521 for other scx200_* drivers.
1523 If compiled as a module, the driver is named scx200.
1525 config SCx200HR_TIMER
1526 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1527 depends on SCx200 && GENERIC_TIME
1528 default y
1529 help
1530 This driver provides a clocksource built upon the on-chip
1531 27MHz high-resolution timer. Its also a workaround for
1532 NSC Geode SC-1100's buggy TSC, which loses time when the
1533 processor goes idle (as is done by the scheduler). The
1534 other workaround is idle=poll boot option.
1536 config GEODE_MFGPT_TIMER
1537 def_bool y
1538 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
1539 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
1540 help
1541 This driver provides a clock event source based on the MFGPT
1542 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1543 MFGPTs have a better resolution and max interval than the
1544 generic PIT, and are suitable for use as high-res timers.
1546 endif # X86_32
1548 config K8_NB
1549 def_bool y
1550 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
1552 source "drivers/pcmcia/Kconfig"
1554 source "drivers/pci/hotplug/Kconfig"
1556 endmenu
1559 menu "Executable file formats / Emulations"
1561 source "fs/Kconfig.binfmt"
1563 config IA32_EMULATION
1564 bool "IA32 Emulation"
1565 depends on X86_64
1566 select COMPAT_BINFMT_ELF
1567 help
1568 Include code to run 32-bit programs under a 64-bit kernel. You should
1569 likely turn this on, unless you're 100% sure that you don't have any
1570 32-bit programs left.
1572 config IA32_AOUT
1573 tristate "IA32 a.out support"
1574 depends on IA32_EMULATION
1575 help
1576 Support old a.out binaries in the 32bit emulation.
1578 config COMPAT
1579 def_bool y
1580 depends on IA32_EMULATION
1582 config COMPAT_FOR_U64_ALIGNMENT
1583 def_bool COMPAT
1584 depends on X86_64
1586 config SYSVIPC_COMPAT
1587 def_bool y
1588 depends on X86_64 && COMPAT && SYSVIPC
1590 endmenu
1593 source "net/Kconfig"
1595 source "drivers/Kconfig"
1597 source "drivers/firmware/Kconfig"
1599 source "fs/Kconfig"
1601 source "kernel/Kconfig.instrumentation"
1603 source "arch/x86/Kconfig.debug"
1605 source "security/Kconfig"
1607 source "crypto/Kconfig"
1609 source "arch/x86/kvm/Kconfig"
1611 source "lib/Kconfig"