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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
Benjamin LaHaise52fdd082005-09-03 15:56:52 -070017config SEMAPHORE_SLEEPERS
18 bool
19 default y
20
Brian Gerst0d078f62005-10-30 14:59:20 -080021config X86
22 bool
23 default y
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025config MMU
26 bool
27 default y
28
29config SBUS
30 bool
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032config GENERIC_ISA_DMA
33 bool
34 default y
35
36config GENERIC_IOMAP
37 bool
38 default y
39
viro@ZenIV.linux.org.uka08b6b72005-09-06 01:48:42 +010040config ARCH_MAY_HAVE_PC_FDC
41 bool
42 default y
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044source "init/Kconfig"
45
46menu "Processor type and features"
47
48choice
49 prompt "Subarchitecture Type"
50 default X86_PC
51
52config X86_PC
53 bool "PC-compatible"
54 help
55 Choose this option if your computer is a standard PC or compatible.
56
57config X86_ELAN
58 bool "AMD Elan"
59 help
60 Select this for an AMD Elan processor.
61
62 Do not use this option for K6/Athlon/Opteron processors!
63
64 If unsure, choose "PC-compatible" instead.
65
66config X86_VOYAGER
67 bool "Voyager (NCR)"
68 help
69 Voyager is an MCA-based 32-way capable SMP architecture proprietary
70 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
71
72 *** WARNING ***
73
74 If you do not specifically know you have a Voyager based machine,
75 say N here, otherwise the kernel you build will not be bootable.
76
77config X86_NUMAQ
78 bool "NUMAQ (IBM/Sequent)"
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 select NUMA
80 help
81 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
82 multiquad box. This changes the way that processors are bootstrapped,
83 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
84 You will need a new lynxer.elf file to flash your firmware with - send
85 email to <Martin.Bligh@us.ibm.com>.
86
87config X86_SUMMIT
88 bool "Summit/EXA (IBM x440)"
89 depends on SMP
90 help
91 This option is needed for IBM systems that use the Summit/EXA chipset.
92 In particular, it is needed for the x440.
93
94 If you don't have one of these computers, you should say N here.
95
96config X86_BIGSMP
97 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
98 depends on SMP
99 help
100 This option is needed for the systems that have more than 8 CPUs
101 and if the system is not of any sub-arch type above.
102
103 If you don't have such a system, you should say N here.
104
105config X86_VISWS
106 bool "SGI 320/540 (Visual Workstation)"
107 help
108 The SGI Visual Workstation series is an IA32-based workstation
109 based on SGI systems chips with some legacy PC hardware attached.
110
111 Say Y here to create a kernel to run on the SGI 320 or 540.
112
113 A kernel compiled for the Visual Workstation will not run on PCs
114 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
115
116config X86_GENERICARCH
117 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
118 depends on SMP
119 help
120 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
121 It is intended for a generic binary kernel.
122
123config X86_ES7000
124 bool "Support for Unisys ES7000 IA32 series"
125 depends on SMP
126 help
127 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
128 supposed to run on an IA32-based Unisys ES7000 system.
129 Only choose this option if you have such a system, otherwise you
130 should say N here.
131
132endchoice
133
134config ACPI_SRAT
135 bool
136 default y
137 depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
138
139config X86_SUMMIT_NUMA
140 bool
141 default y
142 depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
143
144config X86_CYCLONE_TIMER
145 bool
146 default y
147 depends on X86_SUMMIT || X86_GENERICARCH
148
149config ES7000_CLUSTERED_APIC
150 bool
151 default y
152 depends on SMP && X86_ES7000 && MPENTIUMIII
153
Paolo 'Blaisorblade' Giarrusso96d55b82005-10-30 15:00:07 -0800154source "arch/i386/Kconfig.cpu"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156config HPET_TIMER
157 bool "HPET Timer Support"
158 help
159 This enables the use of the HPET for the kernel's internal timer.
160 HPET is the next generation timer replacing legacy 8254s.
161 You can safely choose Y here. However, HPET will only be
162 activated if the platform and the BIOS support this feature.
163 Otherwise the 8254 will be used for timing services.
164
165 Choose N to continue using the legacy 8254 timer.
166
167config HPET_EMULATE_RTC
Venkatesh Pallipadic91096d2005-08-04 15:36:10 -0700168 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 depends on HPET_TIMER && RTC=y
Venkatesh Pallipadic91096d2005-08-04 15:36:10 -0700170 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172config SMP
173 bool "Symmetric multi-processing support"
174 ---help---
175 This enables support for systems with more than one CPU. If you have
176 a system with only one CPU, like most personal computers, say N. If
177 you have a system with more than one CPU, say Y.
178
179 If you say N here, the kernel will run on single and multiprocessor
180 machines, but will use only one CPU of a multiprocessor machine. If
181 you say Y here, the kernel will run on many, but not all,
182 singleprocessor machines. On a singleprocessor machine, the kernel
183 will run faster if you say N here.
184
185 Note that if you say Y here and choose architecture "586" or
186 "Pentium" under "Processor family", the kernel will not work on 486
187 architectures. Similarly, multiprocessor kernels for the "PPro"
188 architecture may not work on all Pentium based boards.
189
190 People using multiprocessor machines who say Y here should also say
191 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
192 Management" code will be disabled if you say Y here.
193
194 See also the <file:Documentation/smp.txt>,
195 <file:Documentation/i386/IO-APIC.txt>,
196 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
197 <http://www.tldp.org/docs.html#howto>.
198
199 If you don't know what to do here, say N.
200
201config NR_CPUS
202 int "Maximum number of CPUs (2-255)"
203 range 2 255
204 depends on SMP
205 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
206 default "8"
207 help
208 This allows you to specify the maximum number of CPUs which this
209 kernel will support. The maximum supported value is 255 and the
210 minimum value which makes sense is 2.
211
212 This is purely to save memory - each supported CPU adds
213 approximately eight kilobytes to the kernel image.
214
215config SCHED_SMT
216 bool "SMT (Hyperthreading) scheduler support"
217 depends on SMP
218 default off
219 help
220 SMT scheduler support improves the CPU scheduler's decision making
221 when dealing with Intel Pentium 4 chips with HyperThreading at a
222 cost of slightly increased overhead in some places. If unsure say
223 N here.
224
Ingo Molnarcc19ca82005-06-25 14:57:36 -0700225source "kernel/Kconfig.preempt"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227config X86_UP_APIC
228 bool "Local APIC support on uniprocessors"
229 depends on !SMP && !(X86_VISWS || X86_VOYAGER)
230 help
231 A local APIC (Advanced Programmable Interrupt Controller) is an
232 integrated interrupt controller in the CPU. If you have a single-CPU
233 system which has a processor with a local APIC, you can say Y here to
234 enable and use it. If you say Y here even though your machine doesn't
235 have a local APIC, then the kernel will still run with no slowdown at
236 all. The local APIC supports CPU-generated self-interrupts (timer,
237 performance counters), and the NMI watchdog which detects hard
238 lockups.
239
240config X86_UP_IOAPIC
241 bool "IO-APIC support on uniprocessors"
242 depends on X86_UP_APIC
243 help
244 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
245 SMP-capable replacement for PC-style interrupt controllers. Most
246 SMP systems and many recent uniprocessor systems have one.
247
248 If you have a single-CPU system with an IO-APIC, you can say Y here
249 to use it. If you say Y here even though your machine doesn't have
250 an IO-APIC, then the kernel will still run with no slowdown at all.
251
252config X86_LOCAL_APIC
253 bool
254 depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER)
255 default y
256
257config X86_IO_APIC
258 bool
259 depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
260 default y
261
262config X86_VISWS_APIC
263 bool
264 depends on X86_VISWS
265 default y
266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267config X86_MCE
268 bool "Machine Check Exception"
269 depends on !X86_VOYAGER
270 ---help---
271 Machine Check Exception support allows the processor to notify the
272 kernel if it detects a problem (e.g. overheating, component failure).
273 The action the kernel takes depends on the severity of the problem,
274 ranging from a warning message on the console, to halting the machine.
275 Your processor must be a Pentium or newer to support this - check the
276 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
277 have a design flaw which leads to false MCE events - hence MCE is
278 disabled on all P5 processors, unless explicitly enabled with "mce"
279 as a boot argument. Similarly, if MCE is built in and creates a
280 problem on some new non-standard machine, you can boot with "nomce"
281 to disable it. MCE support simply ignores non-MCE processors like
282 the 386 and 486, so nearly everyone can say Y here.
283
284config X86_MCE_NONFATAL
285 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
286 depends on X86_MCE
287 help
288 Enabling this feature starts a timer that triggers every 5 seconds which
289 will look at the machine check registers to see if anything happened.
290 Non-fatal problems automatically get corrected (but still logged).
291 Disable this if you don't want to see these messages.
292 Seeing the messages this option prints out may be indicative of dying hardware,
293 or out-of-spec (ie, overclocked) hardware.
294 This option only does something on certain CPUs.
295 (AMD Athlon/Duron and Intel Pentium 4)
296
297config X86_MCE_P4THERMAL
298 bool "check for P4 thermal throttling interrupt."
299 depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
300 help
301 Enabling this feature will cause a message to be printed when the P4
302 enters thermal throttling.
303
304config TOSHIBA
305 tristate "Toshiba Laptop support"
306 ---help---
307 This adds a driver to safely access the System Management Mode of
308 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
309 not work on models with a Phoenix BIOS. The System Management Mode
310 is used to set the BIOS and power saving options on Toshiba portables.
311
312 For information on utilities to make use of this driver see the
313 Toshiba Linux utilities web site at:
314 <http://www.buzzard.org.uk/toshiba/>.
315
316 Say Y if you intend to run this kernel on a Toshiba portable.
317 Say N otherwise.
318
319config I8K
320 tristate "Dell laptop support"
321 ---help---
322 This adds a driver to safely access the System Management Mode
323 of the CPU on the Dell Inspiron 8000. The System Management Mode
324 is used to read cpu temperature and cooling fan status and to
325 control the fans on the I8K portables.
326
327 This driver has been tested only on the Inspiron 8000 but it may
328 also work with other Dell laptops. You can force loading on other
329 models by passing the parameter `force=1' to the module. Use at
330 your own risk.
331
332 For information on utilities to make use of this driver see the
333 I8K Linux utilities web site at:
334 <http://people.debian.org/~dz/i8k/>
335
336 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
337 Say N otherwise.
338
Jaya Kumara2f7c352005-05-01 08:58:49 -0700339config X86_REBOOTFIXUPS
340 bool "Enable X86 board specific fixups for reboot"
341 depends on X86
342 default n
343 ---help---
344 This enables chipset and/or board specific fixups to be done
345 in order to get reboot to work correctly. This is only needed on
346 some combinations of hardware and BIOS. The symptom, for which
347 this config is intended, is when reboot ends with a stalled/hung
348 system.
349
350 Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1.
351 combination.
352
353 Say Y if you want to enable the fixup. Currently, it's safe to
354 enable this option even if you don't need it.
355 Say N otherwise.
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357config MICROCODE
358 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
359 ---help---
360 If you say Y here and also to "/dev file system support" in the
361 'File systems' section, you will be able to update the microcode on
362 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
363 Pentium III, Pentium 4, Xeon etc. You will obviously need the
364 actual microcode binary data itself which is not shipped with the
365 Linux kernel.
366
367 For latest news and information on obtaining all the required
368 ingredients for this driver, check:
369 <http://www.urbanmyth.org/microcode/>.
370
371 To compile this driver as a module, choose M here: the
372 module will be called microcode.
373
374config X86_MSR
375 tristate "/dev/cpu/*/msr - Model-specific register support"
376 help
377 This device gives privileged processes access to the x86
378 Model-Specific Registers (MSRs). It is a character device with
379 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
380 MSR accesses are directed to a specific CPU on multi-processor
381 systems.
382
383config X86_CPUID
384 tristate "/dev/cpu/*/cpuid - CPU information support"
385 help
386 This device gives processes access to the x86 CPUID instruction to
387 be executed on a specific processor. It is a character device
388 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
389 /dev/cpu/31/cpuid.
390
391source "drivers/firmware/Kconfig"
392
393choice
394 prompt "High Memory Support"
395 default NOHIGHMEM
396
397config NOHIGHMEM
398 bool "off"
399 ---help---
400 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
401 However, the address space of 32-bit x86 processors is only 4
402 Gigabytes large. That means that, if you have a large amount of
403 physical memory, not all of it can be "permanently mapped" by the
404 kernel. The physical memory that's not permanently mapped is called
405 "high memory".
406
407 If you are compiling a kernel which will never run on a machine with
408 more than 1 Gigabyte total physical RAM, answer "off" here (default
409 choice and suitable for most users). This will result in a "3GB/1GB"
410 split: 3GB are mapped so that each process sees a 3GB virtual memory
411 space and the remaining part of the 4GB virtual memory space is used
412 by the kernel to permanently map as much physical memory as
413 possible.
414
415 If the machine has between 1 and 4 Gigabytes physical RAM, then
416 answer "4GB" here.
417
418 If more than 4 Gigabytes is used then answer "64GB" here. This
419 selection turns Intel PAE (Physical Address Extension) mode on.
420 PAE implements 3-level paging on IA32 processors. PAE is fully
421 supported by Linux, PAE mode is implemented on all recent Intel
422 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
423 then the kernel will not boot on CPUs that don't support PAE!
424
425 The actual amount of total physical memory will either be
426 auto detected or can be forced by using a kernel command line option
427 such as "mem=256M". (Try "man bootparam" or see the documentation of
428 your boot loader (lilo or loadlin) about how to pass options to the
429 kernel at boot time.)
430
431 If unsure, say "off".
432
433config HIGHMEM4G
434 bool "4GB"
435 help
436 Select this if you have a 32-bit processor and between 1 and 4
437 gigabytes of physical RAM.
438
439config HIGHMEM64G
440 bool "64GB"
441 help
442 Select this if you have a 32-bit processor and more than 4
443 gigabytes of physical RAM.
444
445endchoice
446
447config HIGHMEM
448 bool
449 depends on HIGHMEM64G || HIGHMEM4G
450 default y
451
452config X86_PAE
453 bool
454 depends on HIGHMEM64G
455 default y
456
457# Common NUMA Features
458config NUMA
459 bool "Numa Memory Allocation and Scheduler Support"
460 depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
461 default n if X86_PC
462 default y if (X86_NUMAQ || X86_SUMMIT)
463
464# Need comments to help the hapless user trying to turn on NUMA support
465comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"
466 depends on X86_NUMAQ && (!HIGHMEM64G || !SMP)
467
468comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
469 depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471config HAVE_ARCH_BOOTMEM_NODE
472 bool
473 depends on NUMA
474 default y
475
Andy Whitcroftaf705362005-06-23 00:07:53 -0700476config ARCH_HAVE_MEMORY_PRESENT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 bool
478 depends on DISCONTIGMEM
479 default y
480
481config NEED_NODE_MEMMAP_SIZE
482 bool
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700483 depends on DISCONTIGMEM || SPARSEMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 default y
485
Dave Hansen6f167ec2005-06-23 00:07:39 -0700486config HAVE_ARCH_ALLOC_REMAP
487 bool
488 depends on NUMA
489 default y
490
Andy Whitcroft215c3402006-01-06 00:12:06 -0800491config ARCH_FLATMEM_ENABLE
492 def_bool y
493 depends on (ARCH_SELECT_MEMORY_MODEL && X86_PC)
494
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700495config ARCH_DISCONTIGMEM_ENABLE
496 def_bool y
497 depends on NUMA
498
499config ARCH_DISCONTIGMEM_DEFAULT
500 def_bool y
501 depends on NUMA
502
503config ARCH_SPARSEMEM_ENABLE
504 def_bool y
Andy Whitcroft215c3402006-01-06 00:12:06 -0800505 depends on (NUMA || (X86_PC && EXPERIMENTAL))
506 select SPARSEMEM_STATIC
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700507
508config ARCH_SELECT_MEMORY_MODEL
509 def_bool y
510 depends on ARCH_SPARSEMEM_ENABLE
511
Dave Hansen3f22ab22005-06-23 00:07:43 -0700512source "mm/Kconfig"
513
Andy Whitcroftb159d432005-06-23 00:07:52 -0700514config HAVE_ARCH_EARLY_PFN_TO_NID
515 bool
516 default y
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700517 depends on NUMA
Andy Whitcroftb159d432005-06-23 00:07:52 -0700518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519config HIGHPTE
520 bool "Allocate 3rd-level pagetables from highmem"
521 depends on HIGHMEM4G || HIGHMEM64G
522 help
523 The VM uses one page table entry for each page of physical memory.
524 For systems with a lot of RAM, this can be wasteful of precious
525 low memory. Setting this option will put user-space page table
526 entries in high memory.
527
528config MATH_EMULATION
529 bool "Math emulation"
530 ---help---
531 Linux can emulate a math coprocessor (used for floating point
532 operations) if you don't have one. 486DX and Pentium processors have
533 a math coprocessor built in, 486SX and 386 do not, unless you added
534 a 487DX or 387, respectively. (The messages during boot time can
535 give you some hints here ["man dmesg"].) Everyone needs either a
536 coprocessor or this emulation.
537
538 If you don't have a math coprocessor, you need to say Y here; if you
539 say Y here even though you have a coprocessor, the coprocessor will
540 be used nevertheless. (This behavior can be changed with the kernel
541 command line option "no387", which comes handy if your coprocessor
542 is broken. Try "man bootparam" or see the documentation of your boot
543 loader (lilo or loadlin) about how to pass options to the kernel at
544 boot time.) This means that it is a good idea to say Y here if you
545 intend to use this kernel on different machines.
546
547 More information about the internals of the Linux math coprocessor
548 emulation can be found in <file:arch/i386/math-emu/README>.
549
550 If you are not sure, say Y; apart from resulting in a 66 KB bigger
551 kernel, it won't hurt.
552
553config MTRR
554 bool "MTRR (Memory Type Range Register) support"
555 ---help---
556 On Intel P6 family processors (Pentium Pro, Pentium II and later)
557 the Memory Type Range Registers (MTRRs) may be used to control
558 processor access to memory ranges. This is most useful if you have
559 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
560 allows bus write transfers to be combined into a larger transfer
561 before bursting over the PCI/AGP bus. This can increase performance
562 of image write operations 2.5 times or more. Saying Y here creates a
563 /proc/mtrr file which may be used to manipulate your processor's
564 MTRRs. Typically the X server should use this.
565
566 This code has a reasonably generic interface so that similar
567 control registers on other processors can be easily supported
568 as well:
569
570 The Cyrix 6x86, 6x86MX and M II processors have Address Range
571 Registers (ARRs) which provide a similar functionality to MTRRs. For
572 these, the ARRs are used to emulate the MTRRs.
573 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
574 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
575 write-combining. All of these processors are supported by this code
576 and it makes sense to say Y here if you have one of them.
577
578 Saying Y here also fixes a problem with buggy SMP BIOSes which only
579 set the MTRRs for the boot CPU and not for the secondary CPUs. This
580 can lead to all sorts of problems, so it's good to say Y here.
581
582 You can safely say Y even if your machine doesn't have MTRRs, you'll
583 just add about 9 KB to your kernel.
584
585 See <file:Documentation/mtrr.txt> for more information.
586
587config EFI
588 bool "Boot from EFI support (EXPERIMENTAL)"
589 depends on ACPI
590 default n
591 ---help---
592 This enables the the kernel to boot on EFI platforms using
593 system configuration information passed to it from the firmware.
594 This also enables the kernel to use any EFI runtime services that are
595 available (such as the EFI variable services).
596
597 This option is only useful on systems that have EFI firmware
598 and will result in a kernel image that is ~8k larger. In addition,
599 you must use the latest ELILO loader available at
600 <http://elilo.sourceforge.net> in order to take advantage of
601 kernel initialization using EFI information (neither GRUB nor LILO know
602 anything about EFI). However, even with this option, the resultant
603 kernel should continue to boot on existing non-EFI platforms.
604
605config IRQBALANCE
606 bool "Enable kernel irq balancing"
607 depends on SMP && X86_IO_APIC
608 default y
609 help
610 The default yes will allow the kernel to do irq load balancing.
611 Saying no will keep the kernel from doing irq load balancing.
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613# turning this on wastes a bunch of space.
614# Summit needs it only when NUMA is on
615config BOOT_IOREMAP
616 bool
617 depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
618 default y
619
620config REGPARM
621 bool "Use register arguments (EXPERIMENTAL)"
622 depends on EXPERIMENTAL
623 default n
624 help
625 Compile the kernel with -mregparm=3. This uses a different ABI
626 and passes the first three arguments of a function call in registers.
627 This will probably break binary only modules.
628
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629config SECCOMP
630 bool "Enable seccomp to safely compute untrusted bytecode"
631 depends on PROC_FS
632 default y
633 help
634 This kernel feature is useful for number crunching applications
635 that may need to compute untrusted bytecode during their
636 execution. By using pipes or other transports made available to
637 the process as file descriptors supporting the read/write
638 syscalls, it's possible to isolate those applications in
639 their own address space using seccomp. Once seccomp is
640 enabled via /proc/<pid>/seccomp, it cannot be disabled
641 and the task is only allowed to execute a few safe syscalls
642 defined by each seccomp mode.
643
644 If unsure, say Y. Only embedded should say N here.
645
Christoph Lameter59121002005-06-23 00:08:25 -0700646source kernel/Kconfig.hz
647
Eric W. Biederman5033cba2005-06-25 14:57:56 -0700648config KEXEC
649 bool "kexec system call (EXPERIMENTAL)"
650 depends on EXPERIMENTAL
651 help
652 kexec is a system call that implements the ability to shutdown your
653 current kernel, and to start another kernel. It is like a reboot
654 but it is indepedent of the system firmware. And like a reboot
655 you can start any kernel with it, not just Linux.
656
657 The name comes from the similiarity to the exec system call.
658
659 It is an ongoing process to be certain the hardware in a machine
660 is properly shutdown, so do not be surprised if this code does not
661 initially work for you. It may help to enable device hotplugging
662 support. As of this writing the exact hardware interface is
663 strongly in flux, so no good recommendation can be made.
664
Vivek Goyal5f016452005-06-25 14:58:19 -0700665config CRASH_DUMP
666 bool "kernel crash dumps (EXPERIMENTAL)"
Vivek Goyal5f016452005-06-25 14:58:19 -0700667 depends on EXPERIMENTAL
668 depends on HIGHMEM
669 help
670 Generate crash dump after being started by kexec.
Maneesh Soni05970d42006-01-09 20:51:52 -0800671
672config PHYSICAL_START
673 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
674
675 default "0x1000000" if CRASH_DUMP
676 default "0x100000"
677 help
678 This gives the physical address where the kernel is loaded. Normally
679 for regular kernels this value is 0x100000 (1MB). But in the case
680 of kexec on panic the fail safe kernel needs to run at a different
681 address than the panic-ed kernel. This option is used to set the load
682 address for kernels used to capture crash dump on being kexec'ed
683 after panic. The default value for crash dump kernels is
684 0x1000000 (16MB). This can also be set based on the "X" value as
685 specified in the "crashkernel=YM@XM" command line boot parameter
686 passed to the panic-ed kernel. Typically this parameter is set as
687 crashkernel=64M@16M. Please take a look at
688 Documentation/kdump/kdump.txt for more details about crash dumps.
689
690 Don't change this unless you know what you are doing.
691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692endmenu
693
694
695menu "Power management options (ACPI, APM)"
696 depends on !X86_VOYAGER
697
698source kernel/power/Kconfig
699
700source "drivers/acpi/Kconfig"
701
702menu "APM (Advanced Power Management) BIOS Support"
703depends on PM && !X86_VISWS
704
705config APM
706 tristate "APM (Advanced Power Management) BIOS support"
Dave Jones987d46132006-01-08 01:05:09 -0800707 depends on PM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 ---help---
709 APM is a BIOS specification for saving power using several different
710 techniques. This is mostly useful for battery powered laptops with
711 APM compliant BIOSes. If you say Y here, the system time will be
712 reset after a RESUME operation, the /proc/apm device will provide
713 battery status information, and user-space programs will receive
714 notification of APM "events" (e.g. battery status change).
715
716 If you select "Y" here, you can disable actual use of the APM
717 BIOS by passing the "apm=off" option to the kernel at boot time.
718
719 Note that the APM support is almost completely disabled for
720 machines with more than one CPU.
721
722 In order to use APM, you will need supporting software. For location
723 and more information, read <file:Documentation/pm.txt> and the
724 Battery Powered Linux mini-HOWTO, available from
725 <http://www.tldp.org/docs.html#howto>.
726
727 This driver does not spin down disk drives (see the hdparm(8)
728 manpage ("man 8 hdparm") for that), and it doesn't turn off
729 VESA-compliant "green" monitors.
730
731 This driver does not support the TI 4000M TravelMate and the ACER
732 486/DX4/75 because they don't have compliant BIOSes. Many "green"
733 desktop machines also don't have compliant BIOSes, and this driver
734 may cause those machines to panic during the boot phase.
735
736 Generally, if you don't have a battery in your machine, there isn't
737 much point in using this driver and you should say N. If you get
738 random kernel OOPSes or reboots that don't seem to be related to
739 anything, try disabling/enabling this option (or disabling/enabling
740 APM in your BIOS).
741
742 Some other things you should try when experiencing seemingly random,
743 "weird" problems:
744
745 1) make sure that you have enough swap space and that it is
746 enabled.
747 2) pass the "no-hlt" option to the kernel
748 3) switch on floating point emulation in the kernel and pass
749 the "no387" option to the kernel
750 4) pass the "floppy=nodma" option to the kernel
751 5) pass the "mem=4M" option to the kernel (thereby disabling
752 all but the first 4 MB of RAM)
753 6) make sure that the CPU is not over clocked.
754 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
755 8) disable the cache from your BIOS settings
756 9) install a fan for the video card or exchange video RAM
757 10) install a better fan for the CPU
758 11) exchange RAM chips
759 12) exchange the motherboard.
760
761 To compile this driver as a module, choose M here: the
762 module will be called apm.
763
764config APM_IGNORE_USER_SUSPEND
765 bool "Ignore USER SUSPEND"
766 depends on APM
767 help
768 This option will ignore USER SUSPEND requests. On machines with a
769 compliant APM BIOS, you want to say N. However, on the NEC Versa M
770 series notebooks, it is necessary to say Y because of a BIOS bug.
771
772config APM_DO_ENABLE
773 bool "Enable PM at boot time"
774 depends on APM
775 ---help---
776 Enable APM features at boot time. From page 36 of the APM BIOS
777 specification: "When disabled, the APM BIOS does not automatically
778 power manage devices, enter the Standby State, enter the Suspend
779 State, or take power saving steps in response to CPU Idle calls."
780 This driver will make CPU Idle calls when Linux is idle (unless this
781 feature is turned off -- see "Do CPU IDLE calls", below). This
782 should always save battery power, but more complicated APM features
783 will be dependent on your BIOS implementation. You may need to turn
784 this option off if your computer hangs at boot time when using APM
785 support, or if it beeps continuously instead of suspending. Turn
786 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
787 T400CDT. This is off by default since most machines do fine without
788 this feature.
789
790config APM_CPU_IDLE
791 bool "Make CPU Idle calls when idle"
792 depends on APM
793 help
794 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
795 On some machines, this can activate improved power savings, such as
796 a slowed CPU clock rate, when the machine is idle. These idle calls
797 are made after the idle loop has run for some length of time (e.g.,
798 333 mS). On some machines, this will cause a hang at boot time or
799 whenever the CPU becomes idle. (On machines with more than one CPU,
800 this option does nothing.)
801
802config APM_DISPLAY_BLANK
803 bool "Enable console blanking using APM"
804 depends on APM
805 help
806 Enable console blanking using the APM. Some laptops can use this to
807 turn off the LCD backlight when the screen blanker of the Linux
808 virtual console blanks the screen. Note that this is only used by
809 the virtual console screen blanker, and won't turn off the backlight
810 when using the X Window system. This also doesn't have anything to
811 do with your VESA-compliant power-saving monitor. Further, this
812 option doesn't work for all laptops -- it might not turn off your
813 backlight at all, or it might print a lot of errors to the console,
814 especially if you are using gpm.
815
816config APM_RTC_IS_GMT
817 bool "RTC stores time in GMT"
818 depends on APM
819 help
820 Say Y here if your RTC (Real Time Clock a.k.a. hardware clock)
821 stores the time in GMT (Greenwich Mean Time). Say N if your RTC
822 stores localtime.
823
824 It is in fact recommended to store GMT in your RTC, because then you
825 don't have to worry about daylight savings time changes. The only
826 reason not to use GMT in your RTC is if you also run a broken OS
827 that doesn't understand GMT.
828
829config APM_ALLOW_INTS
830 bool "Allow interrupts during APM BIOS calls"
831 depends on APM
832 help
833 Normally we disable external interrupts while we are making calls to
834 the APM BIOS as a measure to lessen the effects of a badly behaving
835 BIOS implementation. The BIOS should reenable interrupts if it
836 needs to. Unfortunately, some BIOSes do not -- especially those in
837 many of the newer IBM Thinkpads. If you experience hangs when you
838 suspend, try setting this to Y. Otherwise, say N.
839
840config APM_REAL_MODE_POWER_OFF
841 bool "Use real mode APM BIOS call to power off"
842 depends on APM
843 help
844 Use real mode APM BIOS calls to switch off the computer. This is
845 a work-around for a number of buggy BIOSes. Switch this option on if
846 your computer crashes instead of powering off properly.
847
848endmenu
849
850source "arch/i386/kernel/cpu/cpufreq/Kconfig"
851
852endmenu
853
854menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
855
856config PCI
857 bool "PCI support" if !X86_VISWS
858 depends on !X86_VOYAGER
859 default y if X86_VISWS
860 help
861 Find out whether you have a PCI motherboard. PCI is the name of a
862 bus system, i.e. the way the CPU talks to the other stuff inside
863 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
864 VESA. If you have PCI, say Y, otherwise N.
865
866 The PCI-HOWTO, available from
867 <http://www.tldp.org/docs.html#howto>, contains valuable
868 information about which PCI hardware does work under Linux and which
869 doesn't.
870
871choice
872 prompt "PCI access mode"
873 depends on PCI && !X86_VISWS
874 default PCI_GOANY
875 ---help---
876 On PCI systems, the BIOS can be used to detect the PCI devices and
877 determine their configuration. However, some old PCI motherboards
878 have BIOS bugs and may crash if this is done. Also, some embedded
879 PCI-based systems don't have any BIOS at all. Linux can also try to
880 detect the PCI hardware directly without using the BIOS.
881
882 With this option, you can specify how Linux should detect the
883 PCI devices. If you choose "BIOS", the BIOS will be used,
884 if you choose "Direct", the BIOS won't be used, and if you
885 choose "MMConfig", then PCI Express MMCONFIG will be used.
886 If you choose "Any", the kernel will try MMCONFIG, then the
887 direct access method and falls back to the BIOS if that doesn't
888 work. If unsure, go with the default, which is "Any".
889
890config PCI_GOBIOS
891 bool "BIOS"
892
893config PCI_GOMMCONFIG
894 bool "MMConfig"
895
896config PCI_GODIRECT
897 bool "Direct"
898
899config PCI_GOANY
900 bool "Any"
901
902endchoice
903
904config PCI_BIOS
905 bool
906 depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
907 default y
908
909config PCI_DIRECT
910 bool
911 depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
912 default y
913
914config PCI_MMCONFIG
915 bool
Alexander Nyberg8aadff72005-05-27 12:48:50 +0200916 depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 default y
918
919source "drivers/pci/pcie/Kconfig"
920
921source "drivers/pci/Kconfig"
922
Al Viro5cae8412005-05-04 05:39:22 +0100923config ISA_DMA_API
924 bool
925 default y
926
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927config ISA
928 bool "ISA support"
929 depends on !(X86_VOYAGER || X86_VISWS)
930 help
931 Find out whether you have ISA slots on your motherboard. ISA is the
932 name of a bus system, i.e. the way the CPU talks to the other stuff
933 inside your box. Other bus systems are PCI, EISA, MicroChannel
934 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
935 newer boards don't support it. If you have ISA, say Y, otherwise N.
936
937config EISA
938 bool "EISA support"
939 depends on ISA
940 ---help---
941 The Extended Industry Standard Architecture (EISA) bus was
942 developed as an open alternative to the IBM MicroChannel bus.
943
944 The EISA bus provided some of the features of the IBM MicroChannel
945 bus while maintaining backward compatibility with cards made for
946 the older ISA bus. The EISA bus saw limited use between 1988 and
947 1995 when it was made obsolete by the PCI bus.
948
949 Say Y here if you are building a kernel for an EISA-based machine.
950
951 Otherwise, say N.
952
953source "drivers/eisa/Kconfig"
954
955config MCA
956 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
957 default y if X86_VOYAGER
958 help
959 MicroChannel Architecture is found in some IBM PS/2 machines and
960 laptops. It is a bus system similar to PCI or ISA. See
961 <file:Documentation/mca.txt> (and especially the web page given
962 there) before attempting to build an MCA bus kernel.
963
964source "drivers/mca/Kconfig"
965
966config SCx200
967 tristate "NatSemi SCx200 support"
968 depends on !X86_VOYAGER
969 help
970 This provides basic support for the National Semiconductor SCx200
971 processor. Right now this is just a driver for the GPIO pins.
972
973 If you don't know what to do here, say N.
974
975 This support is also available as a module. If compiled as a
976 module, it will be called scx200.
977
Zwane Mwaikambof3705132005-06-25 14:54:50 -0700978config HOTPLUG_CPU
979 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
980 depends on SMP && HOTPLUG && EXPERIMENTAL
981 ---help---
982 Say Y here to experiment with turning CPUs off and on. CPUs
983 can be controlled through /sys/devices/system/cpu.
984
985 Say N.
986
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987source "drivers/pcmcia/Kconfig"
988
989source "drivers/pci/hotplug/Kconfig"
990
991endmenu
992
993menu "Executable file formats"
994
995source "fs/Kconfig.binfmt"
996
997endmenu
998
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700999source "net/Kconfig"
1000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001source "drivers/Kconfig"
1002
1003source "fs/Kconfig"
1004
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -08001005menu "Instrumentation Support"
1006 depends on EXPERIMENTAL
1007
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008source "arch/i386/oprofile/Kconfig"
1009
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -08001010config KPROBES
1011 bool "Kprobes (EXPERIMENTAL)"
1012 help
1013 Kprobes allows you to trap at almost any kernel address and
1014 execute a callback function. register_kprobe() establishes
1015 a probepoint and specifies the callback. Kprobes is useful
1016 for kernel debugging, non-intrusive instrumentation and testing.
1017 If in doubt, say "N".
1018endmenu
1019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020source "arch/i386/Kconfig.debug"
1021
1022source "security/Kconfig"
1023
1024source "crypto/Kconfig"
1025
1026source "lib/Kconfig"
1027
1028#
1029# Use the generic interrupt handling code in kernel/irq/:
1030#
1031config GENERIC_HARDIRQS
1032 bool
1033 default y
1034
1035config GENERIC_IRQ_PROBE
1036 bool
1037 default y
1038
Ashok Raj54d5d422005-09-06 15:16:15 -07001039config GENERIC_PENDING_IRQ
1040 bool
1041 depends on GENERIC_HARDIRQS && SMP
1042 default y
1043
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044config X86_SMP
1045 bool
1046 depends on SMP && !X86_VOYAGER
1047 default y
1048
1049config X86_HT
1050 bool
1051 depends on SMP && !(X86_VISWS || X86_VOYAGER)
1052 default y
1053
1054config X86_BIOS_REBOOT
1055 bool
1056 depends on !(X86_VISWS || X86_VOYAGER)
1057 default y
1058
1059config X86_TRAMPOLINE
1060 bool
1061 depends on X86_SMP || (X86_VOYAGER && SMP)
1062 default y
Thomas Gleixner97fc79f2006-01-09 20:52:31 -08001063
1064config KTIME_SCALAR
1065 bool
1066 default y