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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# For a description of the syntax of this configuration file,
3# see Documentation/kbuild/kconfig-language.txt.
4#
5
6mainmenu "Linux Kernel Configuration"
7
Brian Gerst0d078f62005-10-30 14:59:20 -08008config X86_32
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 bool
10 default y
11 help
12 This is Linux's home port. Linux was originally native to the Intel
13 386, and runs on all the later x86 processors including the Intel
14 486, 586, Pentiums, and various instruction-set-compatible chips by
15 AMD, Cyrix, and others.
16
john stultz6f84fa22006-06-26 00:25:11 -070017config GENERIC_TIME
18 bool
19 default y
20
Thomas Gleixner5d8b34f2007-02-16 01:27:43 -080021config CLOCKSOURCE_WATCHDOG
22 bool
23 default y
24
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -080025config GENERIC_CLOCKEVENTS
26 bool
27 default y
28
29config GENERIC_CLOCKEVENTS_BROADCAST
30 bool
31 default y
Thomas Gleixner575d5e72007-02-17 20:03:21 +010032 depends on X86_LOCAL_APIC
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -080033
Ingo Molnarcbbf4372006-07-03 00:25:00 -070034config LOCKDEP_SUPPORT
35 bool
36 default y
37
Ingo Molnar4a7c7192006-07-03 00:24:39 -070038config STACKTRACE_SUPPORT
39 bool
40 default y
41
Benjamin LaHaise52fdd082005-09-03 15:56:52 -070042config SEMAPHORE_SLEEPERS
43 bool
44 default y
45
Brian Gerst0d078f62005-10-30 14:59:20 -080046config X86
47 bool
48 default y
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050config MMU
51 bool
52 default y
53
Christoph Lameter5ac6da62007-02-10 01:43:14 -080054config ZONE_DMA
55 bool
56 default y
57
Christoph Lameterf1d1a842007-05-12 11:15:24 -070058config QUICKLIST
59 bool
60 default y
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062config SBUS
63 bool
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065config GENERIC_ISA_DMA
66 bool
67 default y
68
69config GENERIC_IOMAP
70 bool
71 default y
72
Jeremy Fitzhardinge91768d62006-12-08 02:36:21 -080073config GENERIC_BUG
74 bool
75 default y
76 depends on BUG
77
Akinobu Mita1cc2b992006-03-26 01:39:24 -080078config GENERIC_HWEIGHT
79 bool
80 default y
81
viro@ZenIV.linux.org.uka08b6b72005-09-06 01:48:42 +010082config ARCH_MAY_HAVE_PC_FDC
83 bool
84 default y
85
Andi Kleene9928672006-01-11 22:43:33 +010086config DMI
87 bool
88 default y
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090source "init/Kconfig"
91
92menu "Processor type and features"
93
Ingo Molnard40891e2007-02-16 01:28:10 -080094source "kernel/time/Kconfig"
95
Adrian Bunkedd711f2006-04-10 22:53:14 -070096config SMP
97 bool "Symmetric multi-processing support"
98 ---help---
99 This enables support for systems with more than one CPU. If you have
100 a system with only one CPU, like most personal computers, say N. If
101 you have a system with more than one CPU, say Y.
102
103 If you say N here, the kernel will run on single and multiprocessor
104 machines, but will use only one CPU of a multiprocessor machine. If
105 you say Y here, the kernel will run on many, but not all,
106 singleprocessor machines. On a singleprocessor machine, the kernel
107 will run faster if you say N here.
108
109 Note that if you say Y here and choose architecture "586" or
110 "Pentium" under "Processor family", the kernel will not work on 486
111 architectures. Similarly, multiprocessor kernels for the "PPro"
112 architecture may not work on all Pentium based boards.
113
114 People using multiprocessor machines who say Y here should also say
115 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
116 Management" code will be disabled if you say Y here.
117
118 See also the <file:Documentation/smp.txt>,
119 <file:Documentation/i386/IO-APIC.txt>,
120 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
121 <http://www.tldp.org/docs.html#howto>.
122
123 If you don't know what to do here, say N.
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125choice
126 prompt "Subarchitecture Type"
127 default X86_PC
128
129config X86_PC
130 bool "PC-compatible"
131 help
132 Choose this option if your computer is a standard PC or compatible.
133
134config X86_ELAN
135 bool "AMD Elan"
136 help
137 Select this for an AMD Elan processor.
138
139 Do not use this option for K6/Athlon/Opteron processors!
140
141 If unsure, choose "PC-compatible" instead.
142
143config X86_VOYAGER
144 bool "Voyager (NCR)"
145 help
146 Voyager is an MCA-based 32-way capable SMP architecture proprietary
147 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
148
149 *** WARNING ***
150
151 If you do not specifically know you have a Voyager based machine,
152 say N here, otherwise the kernel you build will not be bootable.
153
154config X86_NUMAQ
155 bool "NUMAQ (IBM/Sequent)"
Adrian Bunk905c3992006-03-23 02:59:55 -0800156 select SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 select NUMA
158 help
159 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
160 multiquad box. This changes the way that processors are bootstrapped,
161 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
162 You will need a new lynxer.elf file to flash your firmware with - send
163 email to <Martin.Bligh@us.ibm.com>.
164
165config X86_SUMMIT
166 bool "Summit/EXA (IBM x440)"
167 depends on SMP
168 help
169 This option is needed for IBM systems that use the Summit/EXA chipset.
170 In particular, it is needed for the x440.
171
172 If you don't have one of these computers, you should say N here.
KAMEZAWA Hiroyuki38e716a2006-08-27 01:24:00 -0700173 If you want to build a NUMA kernel, you must select ACPI.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175config X86_BIGSMP
176 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
177 depends on SMP
178 help
179 This option is needed for the systems that have more than 8 CPUs
180 and if the system is not of any sub-arch type above.
181
182 If you don't have such a system, you should say N here.
183
184config X86_VISWS
185 bool "SGI 320/540 (Visual Workstation)"
186 help
187 The SGI Visual Workstation series is an IA32-based workstation
188 based on SGI systems chips with some legacy PC hardware attached.
189
190 Say Y here to create a kernel to run on the SGI 320 or 540.
191
192 A kernel compiled for the Visual Workstation will not run on PCs
193 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
194
195config X86_GENERICARCH
196 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 help
198 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
199 It is intended for a generic binary kernel.
KAMEZAWA Hiroyuki38e716a2006-08-27 01:24:00 -0700200 If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202config X86_ES7000
203 bool "Support for Unisys ES7000 IA32 series"
204 depends on SMP
205 help
206 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
207 supposed to run on an IA32-based Unisys ES7000 system.
208 Only choose this option if you have such a system, otherwise you
209 should say N here.
210
211endchoice
212
Rusty Russelld3561b72006-12-07 02:14:07 +0100213config PARAVIRT
214 bool "Paravirtualization support (EXPERIMENTAL)"
215 depends on EXPERIMENTAL
Randy Dunlapf0f32fc2006-12-09 21:33:36 +0100216 depends on !(X86_VISWS || X86_VOYAGER)
Rusty Russelld3561b72006-12-07 02:14:07 +0100217 help
218 Paravirtualization is a way of running multiple instances of
219 Linux on the same machine, under a hypervisor. This option
220 changes the kernel so it can modify itself when it is run
221 under a hypervisor, improving performance significantly.
222 However, when run without a hypervisor the kernel is
223 theoretically slower. If in doubt, say N.
224
Zachary Amsden7ce0bcf2007-02-13 13:26:21 +0100225config VMI
226 bool "VMI Paravirt-ops support"
Zachary Amsden9f53a722007-05-02 19:27:16 +0200227 depends on PARAVIRT
Zachary Amsden7ce0bcf2007-02-13 13:26:21 +0100228 help
Ingo Molnare9417fb2007-03-05 13:13:46 +0100229 VMI provides a paravirtualized interface to the VMware ESX server
230 (it could be used by other hypervisors in theory too, but is not
231 at the moment), by linking the kernel to a GPL-ed ROM module
Zachary Amsden7ce0bcf2007-02-13 13:26:21 +0100232 provided by the hypervisor.
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234config ACPI_SRAT
235 bool
236 default y
Andrew Morton55910b22006-06-30 05:15:00 -0400237 depends on ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
Yasunori Goto762834e2006-06-23 02:03:19 -0700238 select ACPI_NUMA
239
240config HAVE_ARCH_PARSE_SRAT
241 bool
242 default y
243 depends on ACPI_SRAT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245config X86_SUMMIT_NUMA
246 bool
247 default y
248 depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
249
250config X86_CYCLONE_TIMER
251 bool
252 default y
253 depends on X86_SUMMIT || X86_GENERICARCH
254
255config ES7000_CLUSTERED_APIC
256 bool
257 default y
258 depends on SMP && X86_ES7000 && MPENTIUMIII
259
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -0800260source "arch/i386/Kconfig.cpu"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262config HPET_TIMER
263 bool "HPET Timer Support"
264 help
265 This enables the use of the HPET for the kernel's internal timer.
266 HPET is the next generation timer replacing legacy 8254s.
267 You can safely choose Y here. However, HPET will only be
268 activated if the platform and the BIOS support this feature.
269 Otherwise the 8254 will be used for timing services.
270
271 Choose N to continue using the legacy 8254 timer.
272
273config HPET_EMULATE_RTC
Venkatesh Pallipadic91096d2005-08-04 15:36:10 -0700274 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 depends on HPET_TIMER && RTC=y
Venkatesh Pallipadic91096d2005-08-04 15:36:10 -0700276 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278config NR_CPUS
279 int "Maximum number of CPUs (2-255)"
280 range 2 255
281 depends on SMP
282 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
283 default "8"
284 help
285 This allows you to specify the maximum number of CPUs which this
286 kernel will support. The maximum supported value is 255 and the
287 minimum value which makes sense is 2.
288
289 This is purely to save memory - each supported CPU adds
290 approximately eight kilobytes to the kernel image.
291
292config SCHED_SMT
293 bool "SMT (Hyperthreading) scheduler support"
James Bottomley96c52742006-06-27 02:53:49 -0700294 depends on X86_HT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 help
296 SMT scheduler support improves the CPU scheduler's decision making
297 when dealing with Intel Pentium 4 chips with HyperThreading at a
298 cost of slightly increased overhead in some places. If unsure say
299 N here.
300
Siddha, Suresh B1e9f28f2006-03-27 01:15:22 -0800301config SCHED_MC
302 bool "Multi-core scheduler support"
James Bottomley96c52742006-06-27 02:53:49 -0700303 depends on X86_HT
Siddha, Suresh B1e9f28f2006-03-27 01:15:22 -0800304 default y
305 help
306 Multi-core scheduler support improves the CPU scheduler's decision
307 making when dealing with multi-core CPU chips at a cost of slightly
308 increased overhead in some places. If unsure say N here.
309
Ingo Molnarcc19ca82005-06-25 14:57:36 -0700310source "kernel/Kconfig.preempt"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312config X86_UP_APIC
313 bool "Local APIC support on uniprocessors"
Andi Kleen874c4fe2006-09-26 10:52:26 +0200314 depends on !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 help
316 A local APIC (Advanced Programmable Interrupt Controller) is an
317 integrated interrupt controller in the CPU. If you have a single-CPU
318 system which has a processor with a local APIC, you can say Y here to
319 enable and use it. If you say Y here even though your machine doesn't
320 have a local APIC, then the kernel will still run with no slowdown at
321 all. The local APIC supports CPU-generated self-interrupts (timer,
322 performance counters), and the NMI watchdog which detects hard
323 lockups.
324
325config X86_UP_IOAPIC
326 bool "IO-APIC support on uniprocessors"
327 depends on X86_UP_APIC
328 help
329 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
330 SMP-capable replacement for PC-style interrupt controllers. Most
331 SMP systems and many recent uniprocessor systems have one.
332
333 If you have a single-CPU system with an IO-APIC, you can say Y here
334 to use it. If you say Y here even though your machine doesn't have
335 an IO-APIC, then the kernel will still run with no slowdown at all.
336
337config X86_LOCAL_APIC
338 bool
Andi Kleen874c4fe2006-09-26 10:52:26 +0200339 depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 default y
341
342config X86_IO_APIC
343 bool
Andi Kleen874c4fe2006-09-26 10:52:26 +0200344 depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 default y
346
347config X86_VISWS_APIC
348 bool
349 depends on X86_VISWS
350 default y
351
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352config X86_MCE
353 bool "Machine Check Exception"
354 depends on !X86_VOYAGER
355 ---help---
356 Machine Check Exception support allows the processor to notify the
357 kernel if it detects a problem (e.g. overheating, component failure).
358 The action the kernel takes depends on the severity of the problem,
359 ranging from a warning message on the console, to halting the machine.
360 Your processor must be a Pentium or newer to support this - check the
361 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
362 have a design flaw which leads to false MCE events - hence MCE is
363 disabled on all P5 processors, unless explicitly enabled with "mce"
364 as a boot argument. Similarly, if MCE is built in and creates a
365 problem on some new non-standard machine, you can boot with "nomce"
366 to disable it. MCE support simply ignores non-MCE processors like
367 the 386 and 486, so nearly everyone can say Y here.
368
369config X86_MCE_NONFATAL
370 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
371 depends on X86_MCE
372 help
373 Enabling this feature starts a timer that triggers every 5 seconds which
374 will look at the machine check registers to see if anything happened.
375 Non-fatal problems automatically get corrected (but still logged).
376 Disable this if you don't want to see these messages.
377 Seeing the messages this option prints out may be indicative of dying hardware,
378 or out-of-spec (ie, overclocked) hardware.
379 This option only does something on certain CPUs.
380 (AMD Athlon/Duron and Intel Pentium 4)
381
382config X86_MCE_P4THERMAL
383 bool "check for P4 thermal throttling interrupt."
384 depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
385 help
386 Enabling this feature will cause a message to be printed when the P4
387 enters thermal throttling.
388
Andi Kleenc38bfdc2006-06-26 13:58:44 +0200389config VM86
390 default y
391 bool "Enable VM86 support" if EMBEDDED
392 help
393 This option is required by programs like DOSEMU to run 16-bit legacy
394 code on X86 processors. It also may be needed by software like
395 XFree86 to initialize some video cards via BIOS. Disabling this
396 option saves about 6k.
397
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398config TOSHIBA
399 tristate "Toshiba Laptop support"
400 ---help---
401 This adds a driver to safely access the System Management Mode of
402 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
403 not work on models with a Phoenix BIOS. The System Management Mode
404 is used to set the BIOS and power saving options on Toshiba portables.
405
406 For information on utilities to make use of this driver see the
407 Toshiba Linux utilities web site at:
408 <http://www.buzzard.org.uk/toshiba/>.
409
410 Say Y if you intend to run this kernel on a Toshiba portable.
411 Say N otherwise.
412
413config I8K
414 tristate "Dell laptop support"
415 ---help---
416 This adds a driver to safely access the System Management Mode
417 of the CPU on the Dell Inspiron 8000. The System Management Mode
418 is used to read cpu temperature and cooling fan status and to
419 control the fans on the I8K portables.
420
421 This driver has been tested only on the Inspiron 8000 but it may
422 also work with other Dell laptops. You can force loading on other
423 models by passing the parameter `force=1' to the module. Use at
424 your own risk.
425
426 For information on utilities to make use of this driver see the
427 I8K Linux utilities web site at:
428 <http://people.debian.org/~dz/i8k/>
429
430 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
431 Say N otherwise.
432
Jaya Kumara2f7c352005-05-01 08:58:49 -0700433config X86_REBOOTFIXUPS
434 bool "Enable X86 board specific fixups for reboot"
435 depends on X86
436 default n
437 ---help---
438 This enables chipset and/or board specific fixups to be done
439 in order to get reboot to work correctly. This is only needed on
440 some combinations of hardware and BIOS. The symptom, for which
441 this config is intended, is when reboot ends with a stalled/hung
442 system.
443
Andres Salomon95069f82007-07-06 11:17:30 -0700444 Currently, the only fixup is for the Geode machines using
445 CS5530A and CS5536 chipsets.
Jaya Kumara2f7c352005-05-01 08:58:49 -0700446
447 Say Y if you want to enable the fixup. Currently, it's safe to
448 enable this option even if you don't need it.
449 Say N otherwise.
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451config MICROCODE
452 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
Shaohua Li9a4b9ef2006-09-27 01:50:53 -0700453 select FW_LOADER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 ---help---
455 If you say Y here and also to "/dev file system support" in the
456 'File systems' section, you will be able to update the microcode on
457 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
458 Pentium III, Pentium 4, Xeon etc. You will obviously need the
459 actual microcode binary data itself which is not shipped with the
460 Linux kernel.
461
462 For latest news and information on obtaining all the required
463 ingredients for this driver, check:
464 <http://www.urbanmyth.org/microcode/>.
465
466 To compile this driver as a module, choose M here: the
467 module will be called microcode.
468
Shaohua Li9a3110b2006-09-27 01:50:51 -0700469config MICROCODE_OLD_INTERFACE
470 bool
471 depends on MICROCODE
472 default y
473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474config X86_MSR
475 tristate "/dev/cpu/*/msr - Model-specific register support"
476 help
477 This device gives privileged processes access to the x86
478 Model-Specific Registers (MSRs). It is a character device with
479 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
480 MSR accesses are directed to a specific CPU on multi-processor
481 systems.
482
483config X86_CPUID
484 tristate "/dev/cpu/*/cpuid - CPU information support"
485 help
486 This device gives processes access to the x86 CPUID instruction to
487 be executed on a specific processor. It is a character device
488 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
489 /dev/cpu/31/cpuid.
490
491source "drivers/firmware/Kconfig"
492
493choice
494 prompt "High Memory Support"
Randy Dunlapf6ca8082006-12-07 02:14:19 +0100495 default HIGHMEM4G if !X86_NUMAQ
496 default HIGHMEM64G if X86_NUMAQ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
498config NOHIGHMEM
499 bool "off"
Adrian Bunk905c3992006-03-23 02:59:55 -0800500 depends on !X86_NUMAQ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 ---help---
502 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
503 However, the address space of 32-bit x86 processors is only 4
504 Gigabytes large. That means that, if you have a large amount of
505 physical memory, not all of it can be "permanently mapped" by the
506 kernel. The physical memory that's not permanently mapped is called
507 "high memory".
508
509 If you are compiling a kernel which will never run on a machine with
510 more than 1 Gigabyte total physical RAM, answer "off" here (default
511 choice and suitable for most users). This will result in a "3GB/1GB"
512 split: 3GB are mapped so that each process sees a 3GB virtual memory
513 space and the remaining part of the 4GB virtual memory space is used
514 by the kernel to permanently map as much physical memory as
515 possible.
516
517 If the machine has between 1 and 4 Gigabytes physical RAM, then
518 answer "4GB" here.
519
520 If more than 4 Gigabytes is used then answer "64GB" here. This
521 selection turns Intel PAE (Physical Address Extension) mode on.
522 PAE implements 3-level paging on IA32 processors. PAE is fully
523 supported by Linux, PAE mode is implemented on all recent Intel
524 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
525 then the kernel will not boot on CPUs that don't support PAE!
526
527 The actual amount of total physical memory will either be
528 auto detected or can be forced by using a kernel command line option
529 such as "mem=256M". (Try "man bootparam" or see the documentation of
530 your boot loader (lilo or loadlin) about how to pass options to the
531 kernel at boot time.)
532
533 If unsure, say "off".
534
535config HIGHMEM4G
536 bool "4GB"
Adrian Bunk905c3992006-03-23 02:59:55 -0800537 depends on !X86_NUMAQ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 help
539 Select this if you have a 32-bit processor and between 1 and 4
540 gigabytes of physical RAM.
541
542config HIGHMEM64G
543 bool "64GB"
Andi Kleen9d9bbd42007-06-23 02:29:23 +0200544 depends on !M386 && !M486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 help
546 Select this if you have a 32-bit processor and more than 4
547 gigabytes of physical RAM.
548
549endchoice
550
Mark Lord975b3d32006-02-01 03:06:11 -0800551choice
Dave Hansen753b9f82006-09-25 23:32:29 -0700552 depends on EXPERIMENTAL
Andi Kleen9539d4e2006-04-27 18:39:36 -0700553 prompt "Memory split" if EMBEDDED
Mark Lord975b3d32006-02-01 03:06:11 -0800554 default VMSPLIT_3G
555 help
556 Select the desired split between kernel and user memory.
557
558 If the address range available to the kernel is less than the
559 physical memory installed, the remaining memory will be available
560 as "high memory". Accessing high memory is a little more costly
561 than low memory, as it needs to be mapped into the kernel first.
562 Note that increasing the kernel address space limits the range
563 available to user programs, making the address space there
564 tighter. Selecting anything other than the default 3G/1G split
565 will also likely make your kernel incompatible with binary-only
566 kernel modules.
567
568 If you are not absolutely sure what you are doing, leave this
569 option alone!
570
571 config VMSPLIT_3G
572 bool "3G/1G user/kernel split"
573 config VMSPLIT_3G_OPT
Dave Hansen753b9f82006-09-25 23:32:29 -0700574 depends on !HIGHMEM
Mark Lord975b3d32006-02-01 03:06:11 -0800575 bool "3G/1G user/kernel split (for full 1G low memory)"
576 config VMSPLIT_2G
577 bool "2G/2G user/kernel split"
Bill Irwin6c2af352007-05-02 19:27:22 +0200578 config VMSPLIT_2G_OPT
579 depends on !HIGHMEM
580 bool "2G/2G user/kernel split (for full 2G low memory)"
Mark Lord975b3d32006-02-01 03:06:11 -0800581 config VMSPLIT_1G
582 bool "1G/3G user/kernel split"
583endchoice
584
585config PAGE_OFFSET
586 hex
587 default 0xB0000000 if VMSPLIT_3G_OPT
Bill Irwin6c2af352007-05-02 19:27:22 +0200588 default 0x80000000 if VMSPLIT_2G
589 default 0x78000000 if VMSPLIT_2G_OPT
Mark Lord975b3d32006-02-01 03:06:11 -0800590 default 0x40000000 if VMSPLIT_1G
591 default 0xC0000000
592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593config HIGHMEM
594 bool
595 depends on HIGHMEM64G || HIGHMEM4G
596 default y
597
598config X86_PAE
599 bool
600 depends on HIGHMEM64G
601 default y
Greg Kroah-Hartman6550e072006-06-12 17:11:31 -0700602 select RESOURCES_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
604# Common NUMA Features
605config NUMA
606 bool "Numa Memory Allocation and Scheduler Support"
KAMEZAWA Hiroyuki38e716a2006-08-27 01:24:00 -0700607 depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 default n if X86_PC
609 default y if (X86_NUMAQ || X86_SUMMIT)
610
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
612 depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
613
Yasunori Gotoc80d79d2006-04-10 22:53:53 -0700614config NODES_SHIFT
615 int
616 default "4" if X86_NUMAQ
617 default "3"
618 depends on NEED_MULTIPLE_NODES
619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620config HAVE_ARCH_BOOTMEM_NODE
621 bool
622 depends on NUMA
623 default y
624
Andy Whitcroftaf705362005-06-23 00:07:53 -0700625config ARCH_HAVE_MEMORY_PRESENT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 bool
627 depends on DISCONTIGMEM
628 default y
629
630config NEED_NODE_MEMMAP_SIZE
631 bool
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700632 depends on DISCONTIGMEM || SPARSEMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 default y
634
Dave Hansen6f167ec2005-06-23 00:07:39 -0700635config HAVE_ARCH_ALLOC_REMAP
636 bool
637 depends on NUMA
638 default y
639
Andy Whitcroft215c3402006-01-06 00:12:06 -0800640config ARCH_FLATMEM_ENABLE
641 def_bool y
642 depends on (ARCH_SELECT_MEMORY_MODEL && X86_PC)
643
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700644config ARCH_DISCONTIGMEM_ENABLE
645 def_bool y
646 depends on NUMA
647
648config ARCH_DISCONTIGMEM_DEFAULT
649 def_bool y
650 depends on NUMA
651
652config ARCH_SPARSEMEM_ENABLE
653 def_bool y
Andy Whitcroft215c3402006-01-06 00:12:06 -0800654 depends on (NUMA || (X86_PC && EXPERIMENTAL))
655 select SPARSEMEM_STATIC
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700656
657config ARCH_SELECT_MEMORY_MODEL
658 def_bool y
659 depends on ARCH_SPARSEMEM_ENABLE
660
Mel Gorman4cfee882006-09-27 01:49:51 -0700661config ARCH_POPULATES_NODE_MAP
662 def_bool y
Dave Hansen3f22ab22005-06-23 00:07:43 -0700663
Mel Gorman4cfee882006-09-27 01:49:51 -0700664source "mm/Kconfig"
Andy Whitcroftb159d432005-06-23 00:07:52 -0700665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666config HIGHPTE
667 bool "Allocate 3rd-level pagetables from highmem"
668 depends on HIGHMEM4G || HIGHMEM64G
669 help
670 The VM uses one page table entry for each page of physical memory.
671 For systems with a lot of RAM, this can be wasteful of precious
672 low memory. Setting this option will put user-space page table
673 entries in high memory.
674
675config MATH_EMULATION
676 bool "Math emulation"
677 ---help---
678 Linux can emulate a math coprocessor (used for floating point
679 operations) if you don't have one. 486DX and Pentium processors have
680 a math coprocessor built in, 486SX and 386 do not, unless you added
681 a 487DX or 387, respectively. (The messages during boot time can
682 give you some hints here ["man dmesg"].) Everyone needs either a
683 coprocessor or this emulation.
684
685 If you don't have a math coprocessor, you need to say Y here; if you
686 say Y here even though you have a coprocessor, the coprocessor will
687 be used nevertheless. (This behavior can be changed with the kernel
688 command line option "no387", which comes handy if your coprocessor
689 is broken. Try "man bootparam" or see the documentation of your boot
690 loader (lilo or loadlin) about how to pass options to the kernel at
691 boot time.) This means that it is a good idea to say Y here if you
692 intend to use this kernel on different machines.
693
694 More information about the internals of the Linux math coprocessor
695 emulation can be found in <file:arch/i386/math-emu/README>.
696
697 If you are not sure, say Y; apart from resulting in a 66 KB bigger
698 kernel, it won't hurt.
699
700config MTRR
701 bool "MTRR (Memory Type Range Register) support"
702 ---help---
703 On Intel P6 family processors (Pentium Pro, Pentium II and later)
704 the Memory Type Range Registers (MTRRs) may be used to control
705 processor access to memory ranges. This is most useful if you have
706 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
707 allows bus write transfers to be combined into a larger transfer
708 before bursting over the PCI/AGP bus. This can increase performance
709 of image write operations 2.5 times or more. Saying Y here creates a
710 /proc/mtrr file which may be used to manipulate your processor's
711 MTRRs. Typically the X server should use this.
712
713 This code has a reasonably generic interface so that similar
714 control registers on other processors can be easily supported
715 as well:
716
717 The Cyrix 6x86, 6x86MX and M II processors have Address Range
718 Registers (ARRs) which provide a similar functionality to MTRRs. For
719 these, the ARRs are used to emulate the MTRRs.
720 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
721 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
722 write-combining. All of these processors are supported by this code
723 and it makes sense to say Y here if you have one of them.
724
725 Saying Y here also fixes a problem with buggy SMP BIOSes which only
726 set the MTRRs for the boot CPU and not for the secondary CPUs. This
727 can lead to all sorts of problems, so it's good to say Y here.
728
729 You can safely say Y even if your machine doesn't have MTRRs, you'll
730 just add about 9 KB to your kernel.
731
732 See <file:Documentation/mtrr.txt> for more information.
733
734config EFI
Arthur Othienoc8e54292006-07-30 03:03:22 -0700735 bool "Boot from EFI support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 depends on ACPI
737 default n
738 ---help---
Matt LaPlante4b3f6862006-10-03 22:21:02 +0200739 This enables the kernel to boot on EFI platforms using
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 system configuration information passed to it from the firmware.
741 This also enables the kernel to use any EFI runtime services that are
742 available (such as the EFI variable services).
743
744 This option is only useful on systems that have EFI firmware
745 and will result in a kernel image that is ~8k larger. In addition,
746 you must use the latest ELILO loader available at
747 <http://elilo.sourceforge.net> in order to take advantage of
748 kernel initialization using EFI information (neither GRUB nor LILO know
749 anything about EFI). However, even with this option, the resultant
750 kernel should continue to boot on existing non-EFI platforms.
751
752config IRQBALANCE
753 bool "Enable kernel irq balancing"
754 depends on SMP && X86_IO_APIC
755 default y
756 help
757 The default yes will allow the kernel to do irq load balancing.
758 Saying no will keep the kernel from doing irq load balancing.
759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760# turning this on wastes a bunch of space.
761# Summit needs it only when NUMA is on
762config BOOT_IOREMAP
763 bool
764 depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
765 default y
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767config SECCOMP
768 bool "Enable seccomp to safely compute untrusted bytecode"
769 depends on PROC_FS
770 default y
771 help
772 This kernel feature is useful for number crunching applications
773 that may need to compute untrusted bytecode during their
774 execution. By using pipes or other transports made available to
775 the process as file descriptors supporting the read/write
776 syscalls, it's possible to isolate those applications in
777 their own address space using seccomp. Once seccomp is
778 enabled via /proc/<pid>/seccomp, it cannot be disabled
779 and the task is only allowed to execute a few safe syscalls
780 defined by each seccomp mode.
781
782 If unsure, say Y. Only embedded should say N here.
783
Christoph Lameter59121002005-06-23 00:08:25 -0700784source kernel/Kconfig.hz
785
Eric W. Biederman5033cba2005-06-25 14:57:56 -0700786config KEXEC
Eric W. Biederman371c2f22006-09-26 10:52:40 +0200787 bool "kexec system call"
Eric W. Biederman5033cba2005-06-25 14:57:56 -0700788 help
789 kexec is a system call that implements the ability to shutdown your
790 current kernel, and to start another kernel. It is like a reboot
Egry Gabor48a12042006-06-26 18:47:15 +0200791 but it is independent of the system firmware. And like a reboot
Eric W. Biederman5033cba2005-06-25 14:57:56 -0700792 you can start any kernel with it, not just Linux.
793
Matt LaPlante1f1332f2006-06-29 01:32:47 -0400794 The name comes from the similarity to the exec system call.
Eric W. Biederman5033cba2005-06-25 14:57:56 -0700795
796 It is an ongoing process to be certain the hardware in a machine
797 is properly shutdown, so do not be surprised if this code does not
798 initially work for you. It may help to enable device hotplugging
799 support. As of this writing the exact hardware interface is
800 strongly in flux, so no good recommendation can be made.
801
Vivek Goyal5f016452005-06-25 14:58:19 -0700802config CRASH_DUMP
803 bool "kernel crash dumps (EXPERIMENTAL)"
Vivek Goyal5f016452005-06-25 14:58:19 -0700804 depends on EXPERIMENTAL
805 depends on HIGHMEM
806 help
807 Generate crash dump after being started by kexec.
Andi Kleen1edf7772006-09-26 10:52:35 +0200808 This should be normally only set in special crash dump kernels
809 which are loaded in the main kernel with kexec-tools into
810 a specially reserved region and then later executed after
811 a crash by kdump/kexec. The crash dump kernel must be compiled
812 to a memory address not used by the main kernel or BIOS using
813 PHYSICAL_START.
814 For more details see Documentation/kdump/kdump.txt
Maneesh Soni05970d42006-01-09 20:51:52 -0800815
Vivek Goyaldd0ec162007-01-05 16:36:30 -0800816config PHYSICAL_START
817 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
818 default "0x100000"
819 help
820 This gives the physical address where the kernel is loaded.
821
822 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
823 bzImage will decompress itself to above physical address and
824 run from there. Otherwise, bzImage will run from the address where
825 it has been loaded by the boot loader and will ignore above physical
826 address.
827
828 In normal kdump cases one does not have to set/change this option
829 as now bzImage can be compiled as a completely relocatable image
830 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
831 address. This option is mainly useful for the folks who don't want
832 to use a bzImage for capturing the crash dump and want to use a
833 vmlinux instead. vmlinux is not relocatable hence a kernel needs
834 to be specifically compiled to run from a specific memory area
835 (normally a reserved region) and this option comes handy.
836
837 So if you are using bzImage for capturing the crash dump, leave
838 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
839 Otherwise if you plan to use vmlinux for capturing the crash dump
840 change this value to start of the reserved region (Typically 16MB
841 0x1000000). In other words, it can be set based on the "X" value as
842 specified in the "crashkernel=YM@XM" command line boot parameter
843 passed to the panic-ed kernel. Typically this parameter is set as
844 crashkernel=64M@16M. Please take a look at
845 Documentation/kdump/kdump.txt for more details about crash dumps.
846
847 Usage of bzImage for capturing the crash dump is recommended as
848 one does not have to build two kernels. Same kernel can be used
849 as production kernel and capture kernel. Above option should have
850 gone away after relocatable bzImage support is introduced. But it
851 is present because there are users out there who continue to use
852 vmlinux for dump capture. This option should go away down the
853 line.
854
855 Don't change this unless you know what you are doing.
856
Eric W. Biederman968de4f2006-12-07 02:14:04 +0100857config RELOCATABLE
Vivek Goyal4c7aa6c2006-12-07 02:14:04 +0100858 bool "Build a relocatable kernel(EXPERIMENTAL)"
859 depends on EXPERIMENTAL
Eric W. Biederman968de4f2006-12-07 02:14:04 +0100860 help
Robert P. J. Dayfd2dbc92007-05-09 07:23:41 +0200861 This builds a kernel image that retains relocation information
Eric W. Biederman968de4f2006-12-07 02:14:04 +0100862 so it can be loaded someplace besides the default 1MB.
Robert P. J. Dayfd2dbc92007-05-09 07:23:41 +0200863 The relocations tend to make the kernel binary about 10% larger,
Eric W. Biederman968de4f2006-12-07 02:14:04 +0100864 but are discarded at runtime.
865
866 One use is for the kexec on panic case where the recovery kernel
867 must live at a different physical address than the primary
868 kernel.
869
Vivek Goyale69f2022006-12-07 02:14:04 +0100870config PHYSICAL_ALIGN
871 hex "Alignment value to which kernel should be aligned"
Maneesh Soni05970d42006-01-09 20:51:52 -0800872 default "0x100000"
Vivek Goyale69f2022006-12-07 02:14:04 +0100873 range 0x2000 0x400000
Maneesh Soni05970d42006-01-09 20:51:52 -0800874 help
Vivek Goyale69f2022006-12-07 02:14:04 +0100875 This value puts the alignment restrictions on physical address
876 where kernel is loaded and run from. Kernel is compiled for an
877 address which meets above alignment restriction.
878
879 If bootloader loads the kernel at a non-aligned address and
880 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
881 address aligned to above value and run from there.
882
883 If bootloader loads the kernel at a non-aligned address and
884 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
885 load address and decompress itself to the address it has been
886 compiled for and run from there. The address for which kernel is
887 compiled already meets above alignment restrictions. Hence the
888 end result is that kernel runs from a physical address meeting
889 above alignment restrictions.
Maneesh Soni05970d42006-01-09 20:51:52 -0800890
891 Don't change this unless you know what you are doing.
892
Randy Dunlapce63ad72006-01-14 13:20:51 -0800893config HOTPLUG_CPU
Stefan Richter1dbf37e2007-05-23 13:58:08 -0700894 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
Ashok Raj35076bd2006-04-27 18:39:30 -0700895 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
Randy Dunlapce63ad72006-01-14 13:20:51 -0800896 ---help---
Pavel Machekb2d596d2006-05-15 09:44:34 -0700897 Say Y here to experiment with turning CPUs off and on, and to
898 enable suspend on SMP systems. CPUs can be controlled through
899 /sys/devices/system/cpu.
Randy Dunlapce63ad72006-01-14 13:20:51 -0800900
Ingo Molnare6e54942006-06-27 02:53:50 -0700901config COMPAT_VDSO
902 bool "Compat VDSO support"
903 default y
904 help
905 Map the VDSO to the predictable old-style address too.
906 ---help---
907 Say N here if you are running a sufficiently recent glibc
908 version (2.3.3 or later), to remove the high-mapped
909 VDSO mapping and to exclusively use the randomized VDSO.
910
911 If unsure, say Y.
Randy Dunlapce63ad72006-01-14 13:20:51 -0800912
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913endmenu
914
Yasunori Gotocc576372006-06-29 02:24:27 -0700915config ARCH_ENABLE_MEMORY_HOTPLUG
916 def_bool y
917 depends on HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919menu "Power management options (ACPI, APM)"
920 depends on !X86_VOYAGER
921
922source kernel/power/Kconfig
923
924source "drivers/acpi/Kconfig"
925
Jan Engelhardt79463312007-05-02 19:27:12 +0200926menuconfig APM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 tristate "APM (Advanced Power Management) BIOS support"
Jan Engelhardt79463312007-05-02 19:27:12 +0200928 depends on PM && !X86_VISWS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 ---help---
930 APM is a BIOS specification for saving power using several different
931 techniques. This is mostly useful for battery powered laptops with
932 APM compliant BIOSes. If you say Y here, the system time will be
933 reset after a RESUME operation, the /proc/apm device will provide
934 battery status information, and user-space programs will receive
935 notification of APM "events" (e.g. battery status change).
936
937 If you select "Y" here, you can disable actual use of the APM
938 BIOS by passing the "apm=off" option to the kernel at boot time.
939
940 Note that the APM support is almost completely disabled for
941 machines with more than one CPU.
942
943 In order to use APM, you will need supporting software. For location
944 and more information, read <file:Documentation/pm.txt> and the
945 Battery Powered Linux mini-HOWTO, available from
946 <http://www.tldp.org/docs.html#howto>.
947
948 This driver does not spin down disk drives (see the hdparm(8)
949 manpage ("man 8 hdparm") for that), and it doesn't turn off
950 VESA-compliant "green" monitors.
951
952 This driver does not support the TI 4000M TravelMate and the ACER
953 486/DX4/75 because they don't have compliant BIOSes. Many "green"
954 desktop machines also don't have compliant BIOSes, and this driver
955 may cause those machines to panic during the boot phase.
956
957 Generally, if you don't have a battery in your machine, there isn't
958 much point in using this driver and you should say N. If you get
959 random kernel OOPSes or reboots that don't seem to be related to
960 anything, try disabling/enabling this option (or disabling/enabling
961 APM in your BIOS).
962
963 Some other things you should try when experiencing seemingly random,
964 "weird" problems:
965
966 1) make sure that you have enough swap space and that it is
967 enabled.
968 2) pass the "no-hlt" option to the kernel
969 3) switch on floating point emulation in the kernel and pass
970 the "no387" option to the kernel
971 4) pass the "floppy=nodma" option to the kernel
972 5) pass the "mem=4M" option to the kernel (thereby disabling
973 all but the first 4 MB of RAM)
974 6) make sure that the CPU is not over clocked.
975 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
976 8) disable the cache from your BIOS settings
977 9) install a fan for the video card or exchange video RAM
978 10) install a better fan for the CPU
979 11) exchange RAM chips
980 12) exchange the motherboard.
981
982 To compile this driver as a module, choose M here: the
983 module will be called apm.
984
Jan Engelhardt79463312007-05-02 19:27:12 +0200985if APM
986
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987config APM_IGNORE_USER_SUSPEND
988 bool "Ignore USER SUSPEND"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 help
990 This option will ignore USER SUSPEND requests. On machines with a
991 compliant APM BIOS, you want to say N. However, on the NEC Versa M
992 series notebooks, it is necessary to say Y because of a BIOS bug.
993
994config APM_DO_ENABLE
995 bool "Enable PM at boot time"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 ---help---
997 Enable APM features at boot time. From page 36 of the APM BIOS
998 specification: "When disabled, the APM BIOS does not automatically
999 power manage devices, enter the Standby State, enter the Suspend
1000 State, or take power saving steps in response to CPU Idle calls."
1001 This driver will make CPU Idle calls when Linux is idle (unless this
1002 feature is turned off -- see "Do CPU IDLE calls", below). This
1003 should always save battery power, but more complicated APM features
1004 will be dependent on your BIOS implementation. You may need to turn
1005 this option off if your computer hangs at boot time when using APM
1006 support, or if it beeps continuously instead of suspending. Turn
1007 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1008 T400CDT. This is off by default since most machines do fine without
1009 this feature.
1010
1011config APM_CPU_IDLE
1012 bool "Make CPU Idle calls when idle"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 help
1014 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1015 On some machines, this can activate improved power savings, such as
1016 a slowed CPU clock rate, when the machine is idle. These idle calls
1017 are made after the idle loop has run for some length of time (e.g.,
1018 333 mS). On some machines, this will cause a hang at boot time or
1019 whenever the CPU becomes idle. (On machines with more than one CPU,
1020 this option does nothing.)
1021
1022config APM_DISPLAY_BLANK
1023 bool "Enable console blanking using APM"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 help
1025 Enable console blanking using the APM. Some laptops can use this to
1026 turn off the LCD backlight when the screen blanker of the Linux
1027 virtual console blanks the screen. Note that this is only used by
1028 the virtual console screen blanker, and won't turn off the backlight
1029 when using the X Window system. This also doesn't have anything to
1030 do with your VESA-compliant power-saving monitor. Further, this
1031 option doesn't work for all laptops -- it might not turn off your
1032 backlight at all, or it might print a lot of errors to the console,
1033 especially if you are using gpm.
1034
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035config APM_ALLOW_INTS
1036 bool "Allow interrupts during APM BIOS calls"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 help
1038 Normally we disable external interrupts while we are making calls to
1039 the APM BIOS as a measure to lessen the effects of a badly behaving
1040 BIOS implementation. The BIOS should reenable interrupts if it
1041 needs to. Unfortunately, some BIOSes do not -- especially those in
1042 many of the newer IBM Thinkpads. If you experience hangs when you
1043 suspend, try setting this to Y. Otherwise, say N.
1044
1045config APM_REAL_MODE_POWER_OFF
1046 bool "Use real mode APM BIOS call to power off"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 help
1048 Use real mode APM BIOS calls to switch off the computer. This is
1049 a work-around for a number of buggy BIOSes. Switch this option on if
1050 your computer crashes instead of powering off properly.
1051
Jan Engelhardt79463312007-05-02 19:27:12 +02001052endif # APM
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
1054source "arch/i386/kernel/cpu/cpufreq/Kconfig"
1055
1056endmenu
1057
1058menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
1059
1060config PCI
1061 bool "PCI support" if !X86_VISWS
1062 depends on !X86_VOYAGER
1063 default y if X86_VISWS
Dan Williamsf282b972007-04-18 18:46:20 +10001064 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 help
1066 Find out whether you have a PCI motherboard. PCI is the name of a
1067 bus system, i.e. the way the CPU talks to the other stuff inside
1068 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1069 VESA. If you have PCI, say Y, otherwise N.
1070
1071 The PCI-HOWTO, available from
1072 <http://www.tldp.org/docs.html#howto>, contains valuable
1073 information about which PCI hardware does work under Linux and which
1074 doesn't.
1075
1076choice
1077 prompt "PCI access mode"
1078 depends on PCI && !X86_VISWS
1079 default PCI_GOANY
1080 ---help---
1081 On PCI systems, the BIOS can be used to detect the PCI devices and
1082 determine their configuration. However, some old PCI motherboards
1083 have BIOS bugs and may crash if this is done. Also, some embedded
1084 PCI-based systems don't have any BIOS at all. Linux can also try to
1085 detect the PCI hardware directly without using the BIOS.
1086
1087 With this option, you can specify how Linux should detect the
1088 PCI devices. If you choose "BIOS", the BIOS will be used,
1089 if you choose "Direct", the BIOS won't be used, and if you
1090 choose "MMConfig", then PCI Express MMCONFIG will be used.
1091 If you choose "Any", the kernel will try MMCONFIG, then the
1092 direct access method and falls back to the BIOS if that doesn't
1093 work. If unsure, go with the default, which is "Any".
1094
1095config PCI_GOBIOS
1096 bool "BIOS"
1097
1098config PCI_GOMMCONFIG
1099 bool "MMConfig"
1100
1101config PCI_GODIRECT
1102 bool "Direct"
1103
1104config PCI_GOANY
1105 bool "Any"
1106
1107endchoice
1108
1109config PCI_BIOS
1110 bool
1111 depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1112 default y
1113
1114config PCI_DIRECT
1115 bool
1116 depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
1117 default y
1118
1119config PCI_MMCONFIG
1120 bool
Alexander Nyberg8aadff72005-05-27 12:48:50 +02001121 depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 default y
1123
1124source "drivers/pci/pcie/Kconfig"
1125
1126source "drivers/pci/Kconfig"
1127
Al Viro5cae8412005-05-04 05:39:22 +01001128config ISA_DMA_API
1129 bool
1130 default y
1131
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132config ISA
1133 bool "ISA support"
1134 depends on !(X86_VOYAGER || X86_VISWS)
1135 help
1136 Find out whether you have ISA slots on your motherboard. ISA is the
1137 name of a bus system, i.e. the way the CPU talks to the other stuff
1138 inside your box. Other bus systems are PCI, EISA, MicroChannel
1139 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1140 newer boards don't support it. If you have ISA, say Y, otherwise N.
1141
1142config EISA
1143 bool "EISA support"
1144 depends on ISA
1145 ---help---
1146 The Extended Industry Standard Architecture (EISA) bus was
1147 developed as an open alternative to the IBM MicroChannel bus.
1148
1149 The EISA bus provided some of the features of the IBM MicroChannel
1150 bus while maintaining backward compatibility with cards made for
1151 the older ISA bus. The EISA bus saw limited use between 1988 and
1152 1995 when it was made obsolete by the PCI bus.
1153
1154 Say Y here if you are building a kernel for an EISA-based machine.
1155
1156 Otherwise, say N.
1157
1158source "drivers/eisa/Kconfig"
1159
1160config MCA
1161 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1162 default y if X86_VOYAGER
1163 help
1164 MicroChannel Architecture is found in some IBM PS/2 machines and
1165 laptops. It is a bus system similar to PCI or ISA. See
1166 <file:Documentation/mca.txt> (and especially the web page given
1167 there) before attempting to build an MCA bus kernel.
1168
1169source "drivers/mca/Kconfig"
1170
1171config SCx200
1172 tristate "NatSemi SCx200 support"
1173 depends on !X86_VOYAGER
1174 help
Jim Cromie6ae74402006-06-26 00:25:19 -07001175 This provides basic support for National Semiconductor's
1176 (now AMD's) Geode processors. The driver probes for the
1177 PCI-IDs of several on-chip devices, so its a good dependency
1178 for other scx200_* drivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
Jim Cromie6ae74402006-06-26 00:25:19 -07001180 If compiled as a module, the driver is named scx200.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181
Jim Cromie6ae74402006-06-26 00:25:19 -07001182config SCx200HR_TIMER
1183 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1184 depends on SCx200 && GENERIC_TIME
1185 default y
1186 help
1187 This driver provides a clocksource built upon the on-chip
1188 27MHz high-resolution timer. Its also a workaround for
1189 NSC Geode SC-1100's buggy TSC, which loses time when the
1190 processor goes idle (as is done by the scheduler). The
1191 other workaround is idle=poll boot option.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
Andi Kleena32073b2006-06-26 13:56:40 +02001193config K8_NB
1194 def_bool y
1195 depends on AGP_AMD64
1196
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197source "drivers/pcmcia/Kconfig"
1198
1199source "drivers/pci/hotplug/Kconfig"
1200
1201endmenu
1202
1203menu "Executable file formats"
1204
1205source "fs/Kconfig.binfmt"
1206
1207endmenu
1208
Sam Ravnborgd5950b42005-07-11 21:03:49 -07001209source "net/Kconfig"
1210
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211source "drivers/Kconfig"
1212
1213source "fs/Kconfig"
1214
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -08001215menu "Instrumentation Support"
1216 depends on EXPERIMENTAL
1217
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218source "arch/i386/oprofile/Kconfig"
1219
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -08001220config KPROBES
1221 bool "Kprobes (EXPERIMENTAL)"
Ananth N Mavinakayanahalli3a872d82006-10-02 02:17:30 -07001222 depends on KALLSYMS && EXPERIMENTAL && MODULES
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -08001223 help
1224 Kprobes allows you to trap at almost any kernel address and
1225 execute a callback function. register_kprobe() establishes
1226 a probepoint and specifies the callback. Kprobes is useful
1227 for kernel debugging, non-intrusive instrumentation and testing.
1228 If in doubt, say "N".
1229endmenu
1230
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231source "arch/i386/Kconfig.debug"
1232
1233source "security/Kconfig"
1234
1235source "crypto/Kconfig"
1236
1237source "lib/Kconfig"
1238
1239#
1240# Use the generic interrupt handling code in kernel/irq/:
1241#
1242config GENERIC_HARDIRQS
1243 bool
1244 default y
1245
1246config GENERIC_IRQ_PROBE
1247 bool
1248 default y
1249
Ashok Raj54d5d422005-09-06 15:16:15 -07001250config GENERIC_PENDING_IRQ
1251 bool
1252 depends on GENERIC_HARDIRQS && SMP
1253 default y
1254
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255config X86_SMP
1256 bool
1257 depends on SMP && !X86_VOYAGER
1258 default y
1259
1260config X86_HT
1261 bool
1262 depends on SMP && !(X86_VISWS || X86_VOYAGER)
1263 default y
1264
1265config X86_BIOS_REBOOT
1266 bool
1267 depends on !(X86_VISWS || X86_VOYAGER)
1268 default y
1269
1270config X86_TRAMPOLINE
1271 bool
1272 depends on X86_SMP || (X86_VOYAGER && SMP)
1273 default y
Thomas Gleixner97fc79f2006-01-09 20:52:31 -08001274
1275config KTIME_SCALAR
1276 bool
1277 default y