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1da177e4 LT |
1 | # |
2 | # For a description of the syntax of this configuration file, | |
3 | # see Documentation/kbuild/kconfig-language.txt. | |
4 | # | |
5 | ||
6 | mainmenu "Linux Kernel Configuration" | |
7 | ||
0d078f6f | 8 | config X86_32 |
1da177e4 LT |
9 | 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 | ||
6f84fa2f | 17 | config GENERIC_TIME |
18 | bool | |
19 | default y | |
20 | ||
82644459 TG |
21 | config GENERIC_CMOS_UPDATE |
22 | bool | |
23 | default y | |
24 | ||
5d8b34fd TG |
25 | config CLOCKSOURCE_WATCHDOG |
26 | bool | |
27 | default y | |
28 | ||
e9e2cdb4 TG |
29 | config GENERIC_CLOCKEVENTS |
30 | bool | |
31 | default y | |
32 | ||
33 | config GENERIC_CLOCKEVENTS_BROADCAST | |
34 | bool | |
35 | default y | |
575d5e72 | 36 | depends on X86_LOCAL_APIC |
e9e2cdb4 | 37 | |
cbbf437a IM |
38 | config LOCKDEP_SUPPORT |
39 | bool | |
40 | default y | |
41 | ||
4a7c7197 IM |
42 | config STACKTRACE_SUPPORT |
43 | bool | |
44 | default y | |
45 | ||
52fdd089 BL |
46 | config SEMAPHORE_SLEEPERS |
47 | bool | |
48 | default y | |
49 | ||
0d078f6f BG |
50 | config X86 |
51 | bool | |
52 | default y | |
53 | ||
1da177e4 LT |
54 | config MMU |
55 | bool | |
56 | default y | |
57 | ||
5ac6da66 CL |
58 | config ZONE_DMA |
59 | bool | |
60 | default y | |
61 | ||
f1d1a842 CL |
62 | config QUICKLIST |
63 | bool | |
64 | default y | |
65 | ||
1da177e4 LT |
66 | config SBUS |
67 | bool | |
68 | ||
1da177e4 LT |
69 | config GENERIC_ISA_DMA |
70 | bool | |
71 | default y | |
72 | ||
73 | config GENERIC_IOMAP | |
74 | bool | |
75 | default y | |
76 | ||
91768d6c JF |
77 | config GENERIC_BUG |
78 | bool | |
79 | default y | |
80 | depends on BUG | |
81 | ||
1cc2b994 AM |
82 | config GENERIC_HWEIGHT |
83 | bool | |
84 | default y | |
85 | ||
a08b6b79 | 86 | config ARCH_MAY_HAVE_PC_FDC |
1da177e4 LT |
87 | bool |
88 | default y | |
89 | ||
e9928674 AK |
90 | config DMI |
91 | bool | |
92 | default y | |
93 | ||
1da177e4 LT |
94 | source "init/Kconfig" |
95 | ||
96 | menu "Processor type and features" | |
97 | ||
d40891e7 IM |
98 | source "kernel/time/Kconfig" |
99 | ||
edd711f3 AB |
100 | config SMP |
101 | bool "Symmetric multi-processing support" | |
102 | ---help--- | |
103 | This enables support for systems with more than one CPU. If you have | |
104 | a system with only one CPU, like most personal computers, say N. If | |
105 | you have a system with more than one CPU, say Y. | |
106 | ||
107 | If you say N here, the kernel will run on single and multiprocessor | |
108 | machines, but will use only one CPU of a multiprocessor machine. If | |
109 | you say Y here, the kernel will run on many, but not all, | |
110 | singleprocessor machines. On a singleprocessor machine, the kernel | |
111 | will run faster if you say N here. | |
112 | ||
113 | Note that if you say Y here and choose architecture "586" or | |
114 | "Pentium" under "Processor family", the kernel will not work on 486 | |
115 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
116 | architecture may not work on all Pentium based boards. | |
117 | ||
118 | People using multiprocessor machines who say Y here should also say | |
119 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
120 | Management" code will be disabled if you say Y here. | |
121 | ||
122 | See also the <file:Documentation/smp.txt>, | |
123 | <file:Documentation/i386/IO-APIC.txt>, | |
124 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at | |
125 | <http://www.tldp.org/docs.html#howto>. | |
126 | ||
127 | If you don't know what to do here, say N. | |
128 | ||
1da177e4 LT |
129 | choice |
130 | prompt "Subarchitecture Type" | |
131 | default X86_PC | |
132 | ||
133 | config X86_PC | |
134 | bool "PC-compatible" | |
135 | help | |
136 | Choose this option if your computer is a standard PC or compatible. | |
137 | ||
138 | config X86_ELAN | |
139 | bool "AMD Elan" | |
140 | help | |
141 | Select this for an AMD Elan processor. | |
142 | ||
143 | Do not use this option for K6/Athlon/Opteron processors! | |
144 | ||
145 | If unsure, choose "PC-compatible" instead. | |
146 | ||
147 | config X86_VOYAGER | |
148 | bool "Voyager (NCR)" | |
149 | help | |
150 | Voyager is an MCA-based 32-way capable SMP architecture proprietary | |
151 | to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based. | |
152 | ||
153 | *** WARNING *** | |
154 | ||
155 | If you do not specifically know you have a Voyager based machine, | |
156 | say N here, otherwise the kernel you build will not be bootable. | |
157 | ||
158 | config X86_NUMAQ | |
159 | bool "NUMAQ (IBM/Sequent)" | |
905c3995 | 160 | select SMP |
1da177e4 LT |
161 | select NUMA |
162 | help | |
163 | This option is used for getting Linux to run on a (IBM/Sequent) NUMA | |
164 | multiquad box. This changes the way that processors are bootstrapped, | |
165 | and uses Clustered Logical APIC addressing mode instead of Flat Logical. | |
166 | You will need a new lynxer.elf file to flash your firmware with - send | |
167 | email to <Martin.Bligh@us.ibm.com>. | |
168 | ||
169 | config X86_SUMMIT | |
170 | bool "Summit/EXA (IBM x440)" | |
171 | depends on SMP | |
172 | help | |
173 | This option is needed for IBM systems that use the Summit/EXA chipset. | |
174 | In particular, it is needed for the x440. | |
175 | ||
176 | If you don't have one of these computers, you should say N here. | |
38e716aa | 177 | If you want to build a NUMA kernel, you must select ACPI. |
1da177e4 LT |
178 | |
179 | config X86_BIGSMP | |
180 | bool "Support for other sub-arch SMP systems with more than 8 CPUs" | |
181 | depends on SMP | |
182 | help | |
183 | This option is needed for the systems that have more than 8 CPUs | |
184 | and if the system is not of any sub-arch type above. | |
185 | ||
186 | If you don't have such a system, you should say N here. | |
187 | ||
188 | config X86_VISWS | |
189 | bool "SGI 320/540 (Visual Workstation)" | |
190 | help | |
191 | The SGI Visual Workstation series is an IA32-based workstation | |
192 | based on SGI systems chips with some legacy PC hardware attached. | |
193 | ||
194 | Say Y here to create a kernel to run on the SGI 320 or 540. | |
195 | ||
196 | A kernel compiled for the Visual Workstation will not run on PCs | |
197 | and vice versa. See <file:Documentation/sgi-visws.txt> for details. | |
198 | ||
199 | config X86_GENERICARCH | |
200 | bool "Generic architecture (Summit, bigsmp, ES7000, default)" | |
1da177e4 LT |
201 | help |
202 | This option compiles in the Summit, bigsmp, ES7000, default subarchitectures. | |
203 | It is intended for a generic binary kernel. | |
38e716aa | 204 | If you want a NUMA kernel, select ACPI. We need SRAT for NUMA. |
1da177e4 LT |
205 | |
206 | config X86_ES7000 | |
207 | bool "Support for Unisys ES7000 IA32 series" | |
208 | depends on SMP | |
209 | help | |
210 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is | |
211 | supposed to run on an IA32-based Unisys ES7000 system. | |
212 | Only choose this option if you have such a system, otherwise you | |
213 | should say N here. | |
214 | ||
215 | endchoice | |
216 | ||
35a6ff54 IM |
217 | config SCHED_NO_NO_OMIT_FRAME_POINTER |
218 | bool "Single-depth WCHAN output" | |
219 | default y | |
220 | help | |
221 | Calculate simpler /proc/<PID>/wchan values. If this option | |
222 | is disabled then wchan values will recurse back to the | |
223 | caller function. This provides more accurate wchan values, | |
224 | at the expense of slightly more scheduling overhead. | |
225 | ||
226 | If in doubt, say "Y". | |
227 | ||
d3561b7f RR |
228 | config PARAVIRT |
229 | bool "Paravirtualization support (EXPERIMENTAL)" | |
230 | depends on EXPERIMENTAL | |
f0f32fcc | 231 | depends on !(X86_VISWS || X86_VOYAGER) |
d3561b7f RR |
232 | help |
233 | Paravirtualization is a way of running multiple instances of | |
234 | Linux on the same machine, under a hypervisor. This option | |
235 | changes the kernel so it can modify itself when it is run | |
236 | under a hypervisor, improving performance significantly. | |
237 | However, when run without a hypervisor the kernel is | |
238 | theoretically slower. If in doubt, say N. | |
239 | ||
9702785a | 240 | source "arch/x86/xen/Kconfig" |
e738fca8 | 241 | |
7ce0bcfd ZA |
242 | config VMI |
243 | bool "VMI Paravirt-ops support" | |
9f53a729 | 244 | depends on PARAVIRT |
7ce0bcfd | 245 | help |
e9417fb3 IM |
246 | VMI provides a paravirtualized interface to the VMware ESX server |
247 | (it could be used by other hypervisors in theory too, but is not | |
248 | at the moment), by linking the kernel to a GPL-ed ROM module | |
7ce0bcfd ZA |
249 | provided by the hypervisor. |
250 | ||
1da177e4 LT |
251 | config ACPI_SRAT |
252 | bool | |
253 | default y | |
55910b28 | 254 | depends on ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH) |
762834e8 YG |
255 | select ACPI_NUMA |
256 | ||
257 | config HAVE_ARCH_PARSE_SRAT | |
258 | bool | |
259 | default y | |
260 | depends on ACPI_SRAT | |
1da177e4 LT |
261 | |
262 | config X86_SUMMIT_NUMA | |
263 | bool | |
264 | default y | |
265 | depends on NUMA && (X86_SUMMIT || X86_GENERICARCH) | |
266 | ||
267 | config X86_CYCLONE_TIMER | |
268 | bool | |
269 | default y | |
270 | depends on X86_SUMMIT || X86_GENERICARCH | |
271 | ||
272 | config ES7000_CLUSTERED_APIC | |
273 | bool | |
274 | default y | |
275 | depends on SMP && X86_ES7000 && MPENTIUMIII | |
276 | ||
96d55b88 | 277 | source "arch/i386/Kconfig.cpu" |
1da177e4 LT |
278 | |
279 | config HPET_TIMER | |
280 | bool "HPET Timer Support" | |
281 | help | |
282 | This enables the use of the HPET for the kernel's internal timer. | |
283 | HPET is the next generation timer replacing legacy 8254s. | |
284 | You can safely choose Y here. However, HPET will only be | |
285 | activated if the platform and the BIOS support this feature. | |
286 | Otherwise the 8254 will be used for timing services. | |
287 | ||
288 | Choose N to continue using the legacy 8254 timer. | |
289 | ||
290 | config HPET_EMULATE_RTC | |
c91096d8 | 291 | bool |
1da177e4 | 292 | depends on HPET_TIMER && RTC=y |
c91096d8 | 293 | default y |
1da177e4 | 294 | |
1da177e4 LT |
295 | config NR_CPUS |
296 | int "Maximum number of CPUs (2-255)" | |
297 | range 2 255 | |
298 | depends on SMP | |
299 | default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000 | |
300 | default "8" | |
301 | help | |
302 | This allows you to specify the maximum number of CPUs which this | |
303 | kernel will support. The maximum supported value is 255 and the | |
304 | minimum value which makes sense is 2. | |
305 | ||
306 | This is purely to save memory - each supported CPU adds | |
307 | approximately eight kilobytes to the kernel image. | |
308 | ||
309 | config SCHED_SMT | |
310 | bool "SMT (Hyperthreading) scheduler support" | |
96c52749 | 311 | depends on X86_HT |
1da177e4 LT |
312 | help |
313 | SMT scheduler support improves the CPU scheduler's decision making | |
314 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
315 | cost of slightly increased overhead in some places. If unsure say | |
316 | N here. | |
317 | ||
1e9f28fa SS |
318 | config SCHED_MC |
319 | bool "Multi-core scheduler support" | |
96c52749 | 320 | depends on X86_HT |
1e9f28fa SS |
321 | default y |
322 | help | |
323 | Multi-core scheduler support improves the CPU scheduler's decision | |
324 | making when dealing with multi-core CPU chips at a cost of slightly | |
325 | increased overhead in some places. If unsure say N here. | |
326 | ||
cc19ca86 | 327 | source "kernel/Kconfig.preempt" |
1da177e4 LT |
328 | |
329 | config X86_UP_APIC | |
330 | bool "Local APIC support on uniprocessors" | |
874c4fe3 | 331 | depends on !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH) |
1da177e4 LT |
332 | help |
333 | A local APIC (Advanced Programmable Interrupt Controller) is an | |
334 | integrated interrupt controller in the CPU. If you have a single-CPU | |
335 | system which has a processor with a local APIC, you can say Y here to | |
336 | enable and use it. If you say Y here even though your machine doesn't | |
337 | have a local APIC, then the kernel will still run with no slowdown at | |
338 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
339 | performance counters), and the NMI watchdog which detects hard | |
340 | lockups. | |
341 | ||
342 | config X86_UP_IOAPIC | |
343 | bool "IO-APIC support on uniprocessors" | |
344 | depends on X86_UP_APIC | |
345 | help | |
346 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an | |
347 | SMP-capable replacement for PC-style interrupt controllers. Most | |
348 | SMP systems and many recent uniprocessor systems have one. | |
349 | ||
350 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
351 | to use it. If you say Y here even though your machine doesn't have | |
352 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
353 | ||
354 | config X86_LOCAL_APIC | |
355 | bool | |
874c4fe3 | 356 | depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH |
1da177e4 LT |
357 | default y |
358 | ||
359 | config X86_IO_APIC | |
360 | bool | |
874c4fe3 | 361 | depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH |
1da177e4 LT |
362 | default y |
363 | ||
364 | config X86_VISWS_APIC | |
365 | bool | |
366 | depends on X86_VISWS | |
367 | default y | |
368 | ||
1da177e4 LT |
369 | config X86_MCE |
370 | bool "Machine Check Exception" | |
371 | depends on !X86_VOYAGER | |
372 | ---help--- | |
373 | Machine Check Exception support allows the processor to notify the | |
374 | kernel if it detects a problem (e.g. overheating, component failure). | |
375 | The action the kernel takes depends on the severity of the problem, | |
376 | ranging from a warning message on the console, to halting the machine. | |
377 | Your processor must be a Pentium or newer to support this - check the | |
378 | flags in /proc/cpuinfo for mce. Note that some older Pentium systems | |
379 | have a design flaw which leads to false MCE events - hence MCE is | |
380 | disabled on all P5 processors, unless explicitly enabled with "mce" | |
381 | as a boot argument. Similarly, if MCE is built in and creates a | |
382 | problem on some new non-standard machine, you can boot with "nomce" | |
383 | to disable it. MCE support simply ignores non-MCE processors like | |
384 | the 386 and 486, so nearly everyone can say Y here. | |
385 | ||
386 | config X86_MCE_NONFATAL | |
387 | tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4" | |
388 | depends on X86_MCE | |
389 | help | |
390 | Enabling this feature starts a timer that triggers every 5 seconds which | |
391 | will look at the machine check registers to see if anything happened. | |
392 | Non-fatal problems automatically get corrected (but still logged). | |
393 | Disable this if you don't want to see these messages. | |
394 | Seeing the messages this option prints out may be indicative of dying hardware, | |
395 | or out-of-spec (ie, overclocked) hardware. | |
396 | This option only does something on certain CPUs. | |
397 | (AMD Athlon/Duron and Intel Pentium 4) | |
398 | ||
399 | config X86_MCE_P4THERMAL | |
400 | bool "check for P4 thermal throttling interrupt." | |
401 | depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS | |
402 | help | |
403 | Enabling this feature will cause a message to be printed when the P4 | |
404 | enters thermal throttling. | |
405 | ||
c38bfdc8 AK |
406 | config VM86 |
407 | default y | |
408 | bool "Enable VM86 support" if EMBEDDED | |
409 | help | |
410 | This option is required by programs like DOSEMU to run 16-bit legacy | |
411 | code on X86 processors. It also may be needed by software like | |
412 | XFree86 to initialize some video cards via BIOS. Disabling this | |
413 | option saves about 6k. | |
414 | ||
1da177e4 LT |
415 | config TOSHIBA |
416 | tristate "Toshiba Laptop support" | |
417 | ---help--- | |
418 | This adds a driver to safely access the System Management Mode of | |
419 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
420 | not work on models with a Phoenix BIOS. The System Management Mode | |
421 | is used to set the BIOS and power saving options on Toshiba portables. | |
422 | ||
423 | For information on utilities to make use of this driver see the | |
424 | Toshiba Linux utilities web site at: | |
425 | <http://www.buzzard.org.uk/toshiba/>. | |
426 | ||
427 | Say Y if you intend to run this kernel on a Toshiba portable. | |
428 | Say N otherwise. | |
429 | ||
430 | config I8K | |
431 | tristate "Dell laptop support" | |
432 | ---help--- | |
433 | This adds a driver to safely access the System Management Mode | |
434 | of the CPU on the Dell Inspiron 8000. The System Management Mode | |
435 | is used to read cpu temperature and cooling fan status and to | |
436 | control the fans on the I8K portables. | |
437 | ||
438 | This driver has been tested only on the Inspiron 8000 but it may | |
439 | also work with other Dell laptops. You can force loading on other | |
440 | models by passing the parameter `force=1' to the module. Use at | |
441 | your own risk. | |
442 | ||
443 | For information on utilities to make use of this driver see the | |
444 | I8K Linux utilities web site at: | |
445 | <http://people.debian.org/~dz/i8k/> | |
446 | ||
447 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | |
448 | Say N otherwise. | |
449 | ||
a2f7c354 JK |
450 | config X86_REBOOTFIXUPS |
451 | bool "Enable X86 board specific fixups for reboot" | |
452 | depends on X86 | |
453 | default n | |
454 | ---help--- | |
455 | This enables chipset and/or board specific fixups to be done | |
456 | in order to get reboot to work correctly. This is only needed on | |
457 | some combinations of hardware and BIOS. The symptom, for which | |
458 | this config is intended, is when reboot ends with a stalled/hung | |
459 | system. | |
460 | ||
95069f89 AS |
461 | Currently, the only fixup is for the Geode machines using |
462 | CS5530A and CS5536 chipsets. | |
a2f7c354 JK |
463 | |
464 | Say Y if you want to enable the fixup. Currently, it's safe to | |
465 | enable this option even if you don't need it. | |
466 | Say N otherwise. | |
467 | ||
1da177e4 LT |
468 | config MICROCODE |
469 | tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support" | |
9a4b9efa | 470 | select FW_LOADER |
1da177e4 | 471 | ---help--- |
ac9d41a3 | 472 | If you say Y here, you will be able to update the microcode on |
1da177e4 LT |
473 | Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II, |
474 | Pentium III, Pentium 4, Xeon etc. You will obviously need the | |
475 | actual microcode binary data itself which is not shipped with the | |
476 | Linux kernel. | |
477 | ||
478 | For latest news and information on obtaining all the required | |
479 | ingredients for this driver, check: | |
480 | <http://www.urbanmyth.org/microcode/>. | |
481 | ||
482 | To compile this driver as a module, choose M here: the | |
483 | module will be called microcode. | |
484 | ||
9a3110bf SL |
485 | config MICROCODE_OLD_INTERFACE |
486 | bool | |
487 | depends on MICROCODE | |
488 | default y | |
489 | ||
1da177e4 LT |
490 | config X86_MSR |
491 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
492 | help | |
493 | This device gives privileged processes access to the x86 | |
494 | Model-Specific Registers (MSRs). It is a character device with | |
495 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
496 | MSR accesses are directed to a specific CPU on multi-processor | |
497 | systems. | |
498 | ||
499 | config X86_CPUID | |
500 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
501 | help | |
502 | This device gives processes access to the x86 CPUID instruction to | |
503 | be executed on a specific processor. It is a character device | |
504 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
505 | /dev/cpu/31/cpuid. | |
506 | ||
507 | source "drivers/firmware/Kconfig" | |
508 | ||
509 | choice | |
510 | prompt "High Memory Support" | |
f6ca8083 RD |
511 | default HIGHMEM4G if !X86_NUMAQ |
512 | default HIGHMEM64G if X86_NUMAQ | |
1da177e4 LT |
513 | |
514 | config NOHIGHMEM | |
515 | bool "off" | |
905c3995 | 516 | depends on !X86_NUMAQ |
1da177e4 LT |
517 | ---help--- |
518 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
519 | However, the address space of 32-bit x86 processors is only 4 | |
520 | Gigabytes large. That means that, if you have a large amount of | |
521 | physical memory, not all of it can be "permanently mapped" by the | |
522 | kernel. The physical memory that's not permanently mapped is called | |
523 | "high memory". | |
524 | ||
525 | If you are compiling a kernel which will never run on a machine with | |
526 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
527 | choice and suitable for most users). This will result in a "3GB/1GB" | |
528 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
529 | space and the remaining part of the 4GB virtual memory space is used | |
530 | by the kernel to permanently map as much physical memory as | |
531 | possible. | |
532 | ||
533 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
534 | answer "4GB" here. | |
535 | ||
536 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
537 | selection turns Intel PAE (Physical Address Extension) mode on. | |
538 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
539 | supported by Linux, PAE mode is implemented on all recent Intel | |
540 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
541 | then the kernel will not boot on CPUs that don't support PAE! | |
542 | ||
543 | The actual amount of total physical memory will either be | |
544 | auto detected or can be forced by using a kernel command line option | |
545 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
546 | your boot loader (lilo or loadlin) about how to pass options to the | |
547 | kernel at boot time.) | |
548 | ||
549 | If unsure, say "off". | |
550 | ||
551 | config HIGHMEM4G | |
552 | bool "4GB" | |
905c3995 | 553 | depends on !X86_NUMAQ |
1da177e4 LT |
554 | help |
555 | Select this if you have a 32-bit processor and between 1 and 4 | |
556 | gigabytes of physical RAM. | |
557 | ||
558 | config HIGHMEM64G | |
559 | bool "64GB" | |
9d9bbd4d | 560 | depends on !M386 && !M486 |
c673f1a9 | 561 | select X86_PAE |
1da177e4 LT |
562 | help |
563 | Select this if you have a 32-bit processor and more than 4 | |
564 | gigabytes of physical RAM. | |
565 | ||
566 | endchoice | |
567 | ||
975b3d3d | 568 | choice |
753b9f86 | 569 | depends on EXPERIMENTAL |
9539d4e7 | 570 | prompt "Memory split" if EMBEDDED |
975b3d3d ML |
571 | default VMSPLIT_3G |
572 | help | |
573 | Select the desired split between kernel and user memory. | |
574 | ||
575 | If the address range available to the kernel is less than the | |
576 | physical memory installed, the remaining memory will be available | |
577 | as "high memory". Accessing high memory is a little more costly | |
578 | than low memory, as it needs to be mapped into the kernel first. | |
579 | Note that increasing the kernel address space limits the range | |
580 | available to user programs, making the address space there | |
581 | tighter. Selecting anything other than the default 3G/1G split | |
582 | will also likely make your kernel incompatible with binary-only | |
583 | kernel modules. | |
584 | ||
585 | If you are not absolutely sure what you are doing, leave this | |
586 | option alone! | |
587 | ||
588 | config VMSPLIT_3G | |
589 | bool "3G/1G user/kernel split" | |
590 | config VMSPLIT_3G_OPT | |
c673f1a9 | 591 | depends on !X86_PAE |
975b3d3d ML |
592 | bool "3G/1G user/kernel split (for full 1G low memory)" |
593 | config VMSPLIT_2G | |
594 | bool "2G/2G user/kernel split" | |
6c2af358 | 595 | config VMSPLIT_2G_OPT |
c673f1a9 | 596 | depends on !X86_PAE |
6c2af358 | 597 | bool "2G/2G user/kernel split (for full 2G low memory)" |
975b3d3d ML |
598 | config VMSPLIT_1G |
599 | bool "1G/3G user/kernel split" | |
600 | endchoice | |
601 | ||
602 | config PAGE_OFFSET | |
603 | hex | |
604 | default 0xB0000000 if VMSPLIT_3G_OPT | |
6c2af358 BI |
605 | default 0x80000000 if VMSPLIT_2G |
606 | default 0x78000000 if VMSPLIT_2G_OPT | |
975b3d3d ML |
607 | default 0x40000000 if VMSPLIT_1G |
608 | default 0xC0000000 | |
609 | ||
1da177e4 LT |
610 | config HIGHMEM |
611 | bool | |
612 | depends on HIGHMEM64G || HIGHMEM4G | |
613 | default y | |
614 | ||
615 | config X86_PAE | |
c673f1a9 WLII |
616 | bool "PAE (Physical Address Extension) Support" |
617 | default n | |
618 | depends on !HIGHMEM4G | |
6550e07f | 619 | select RESOURCES_64BIT |
c673f1a9 WLII |
620 | help |
621 | PAE is required for NX support, and furthermore enables | |
622 | larger swapspace support for non-overcommit purposes. It | |
623 | has the cost of more pagetable lookup overhead, and also | |
624 | consumes more pagetable space per process. | |
1da177e4 LT |
625 | |
626 | # Common NUMA Features | |
627 | config NUMA | |
36ce1514 AK |
628 | bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)" |
629 | depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL | |
1da177e4 LT |
630 | default n if X86_PC |
631 | default y if (X86_NUMAQ || X86_SUMMIT) | |
36ce1514 AK |
632 | help |
633 | NUMA support for i386. This is currently high experimental | |
634 | and should be only used for kernel development. It might also | |
635 | cause boot failures. | |
1da177e4 | 636 | |
1da177e4 LT |
637 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" |
638 | depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI) | |
639 | ||
c80d79d7 YG |
640 | config NODES_SHIFT |
641 | int | |
642 | default "4" if X86_NUMAQ | |
643 | default "3" | |
644 | depends on NEED_MULTIPLE_NODES | |
645 | ||
1da177e4 LT |
646 | config HAVE_ARCH_BOOTMEM_NODE |
647 | bool | |
648 | depends on NUMA | |
649 | default y | |
650 | ||
af705362 | 651 | config ARCH_HAVE_MEMORY_PRESENT |
1da177e4 LT |
652 | bool |
653 | depends on DISCONTIGMEM | |
654 | default y | |
655 | ||
656 | config NEED_NODE_MEMMAP_SIZE | |
657 | bool | |
05b79bdc | 658 | depends on DISCONTIGMEM || SPARSEMEM |
1da177e4 LT |
659 | default y |
660 | ||
6f167ec7 DH |
661 | config HAVE_ARCH_ALLOC_REMAP |
662 | bool | |
663 | depends on NUMA | |
664 | default y | |
665 | ||
215c3409 AW |
666 | config ARCH_FLATMEM_ENABLE |
667 | def_bool y | |
668 | depends on (ARCH_SELECT_MEMORY_MODEL && X86_PC) | |
669 | ||
05b79bdc AW |
670 | config ARCH_DISCONTIGMEM_ENABLE |
671 | def_bool y | |
672 | depends on NUMA | |
673 | ||
674 | config ARCH_DISCONTIGMEM_DEFAULT | |
675 | def_bool y | |
676 | depends on NUMA | |
677 | ||
678 | config ARCH_SPARSEMEM_ENABLE | |
679 | def_bool y | |
215c3409 AW |
680 | depends on (NUMA || (X86_PC && EXPERIMENTAL)) |
681 | select SPARSEMEM_STATIC | |
05b79bdc AW |
682 | |
683 | config ARCH_SELECT_MEMORY_MODEL | |
684 | def_bool y | |
685 | depends on ARCH_SPARSEMEM_ENABLE | |
686 | ||
4cfee88a MG |
687 | config ARCH_POPULATES_NODE_MAP |
688 | def_bool y | |
3f22ab27 | 689 | |
4cfee88a | 690 | source "mm/Kconfig" |
b159d43f | 691 | |
1da177e4 LT |
692 | config HIGHPTE |
693 | bool "Allocate 3rd-level pagetables from highmem" | |
694 | depends on HIGHMEM4G || HIGHMEM64G | |
695 | help | |
696 | The VM uses one page table entry for each page of physical memory. | |
697 | For systems with a lot of RAM, this can be wasteful of precious | |
698 | low memory. Setting this option will put user-space page table | |
699 | entries in high memory. | |
700 | ||
701 | config MATH_EMULATION | |
702 | bool "Math emulation" | |
703 | ---help--- | |
704 | Linux can emulate a math coprocessor (used for floating point | |
705 | operations) if you don't have one. 486DX and Pentium processors have | |
706 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
707 | a 487DX or 387, respectively. (The messages during boot time can | |
708 | give you some hints here ["man dmesg"].) Everyone needs either a | |
709 | coprocessor or this emulation. | |
710 | ||
711 | If you don't have a math coprocessor, you need to say Y here; if you | |
712 | say Y here even though you have a coprocessor, the coprocessor will | |
713 | be used nevertheless. (This behavior can be changed with the kernel | |
714 | command line option "no387", which comes handy if your coprocessor | |
715 | is broken. Try "man bootparam" or see the documentation of your boot | |
716 | loader (lilo or loadlin) about how to pass options to the kernel at | |
717 | boot time.) This means that it is a good idea to say Y here if you | |
718 | intend to use this kernel on different machines. | |
719 | ||
720 | More information about the internals of the Linux math coprocessor | |
da957e11 | 721 | emulation can be found in <file:arch/x86/math-emu/README>. |
1da177e4 LT |
722 | |
723 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
724 | kernel, it won't hurt. | |
725 | ||
726 | config MTRR | |
727 | bool "MTRR (Memory Type Range Register) support" | |
728 | ---help--- | |
729 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
730 | the Memory Type Range Registers (MTRRs) may be used to control | |
731 | processor access to memory ranges. This is most useful if you have | |
732 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
733 | allows bus write transfers to be combined into a larger transfer | |
734 | before bursting over the PCI/AGP bus. This can increase performance | |
735 | of image write operations 2.5 times or more. Saying Y here creates a | |
736 | /proc/mtrr file which may be used to manipulate your processor's | |
737 | MTRRs. Typically the X server should use this. | |
738 | ||
739 | This code has a reasonably generic interface so that similar | |
740 | control registers on other processors can be easily supported | |
741 | as well: | |
742 | ||
743 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
744 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
745 | these, the ARRs are used to emulate the MTRRs. | |
746 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
747 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
748 | write-combining. All of these processors are supported by this code | |
749 | and it makes sense to say Y here if you have one of them. | |
750 | ||
751 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
752 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
753 | can lead to all sorts of problems, so it's good to say Y here. | |
754 | ||
755 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
756 | just add about 9 KB to your kernel. | |
757 | ||
758 | See <file:Documentation/mtrr.txt> for more information. | |
759 | ||
760 | config EFI | |
c8e5429e | 761 | bool "Boot from EFI support" |
1da177e4 LT |
762 | depends on ACPI |
763 | default n | |
764 | ---help--- | |
4b3f686d | 765 | This enables the kernel to boot on EFI platforms using |
1da177e4 LT |
766 | system configuration information passed to it from the firmware. |
767 | This also enables the kernel to use any EFI runtime services that are | |
768 | available (such as the EFI variable services). | |
769 | ||
770 | This option is only useful on systems that have EFI firmware | |
771 | and will result in a kernel image that is ~8k larger. In addition, | |
772 | you must use the latest ELILO loader available at | |
773 | <http://elilo.sourceforge.net> in order to take advantage of | |
774 | kernel initialization using EFI information (neither GRUB nor LILO know | |
775 | anything about EFI). However, even with this option, the resultant | |
776 | kernel should continue to boot on existing non-EFI platforms. | |
777 | ||
778 | config IRQBALANCE | |
779 | bool "Enable kernel irq balancing" | |
780 | depends on SMP && X86_IO_APIC | |
781 | default y | |
782 | help | |
783 | The default yes will allow the kernel to do irq load balancing. | |
784 | Saying no will keep the kernel from doing irq load balancing. | |
785 | ||
1da177e4 LT |
786 | # turning this on wastes a bunch of space. |
787 | # Summit needs it only when NUMA is on | |
788 | config BOOT_IOREMAP | |
789 | bool | |
790 | depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI)) | |
791 | default y | |
792 | ||
1da177e4 LT |
793 | config SECCOMP |
794 | bool "Enable seccomp to safely compute untrusted bytecode" | |
795 | depends on PROC_FS | |
796 | default y | |
797 | help | |
798 | This kernel feature is useful for number crunching applications | |
799 | that may need to compute untrusted bytecode during their | |
800 | execution. By using pipes or other transports made available to | |
801 | the process as file descriptors supporting the read/write | |
802 | syscalls, it's possible to isolate those applications in | |
803 | their own address space using seccomp. Once seccomp is | |
804 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
805 | and the task is only allowed to execute a few safe syscalls | |
806 | defined by each seccomp mode. | |
807 | ||
808 | If unsure, say Y. Only embedded should say N here. | |
809 | ||
59121003 CL |
810 | source kernel/Kconfig.hz |
811 | ||
5033cba0 | 812 | config KEXEC |
371c2f27 | 813 | bool "kexec system call" |
5033cba0 EB |
814 | help |
815 | kexec is a system call that implements the ability to shutdown your | |
816 | current kernel, and to start another kernel. It is like a reboot | |
48a1204c | 817 | but it is independent of the system firmware. And like a reboot |
5033cba0 EB |
818 | you can start any kernel with it, not just Linux. |
819 | ||
1f1332f7 | 820 | The name comes from the similarity to the exec system call. |
5033cba0 EB |
821 | |
822 | It is an ongoing process to be certain the hardware in a machine | |
823 | is properly shutdown, so do not be surprised if this code does not | |
824 | initially work for you. It may help to enable device hotplugging | |
825 | support. As of this writing the exact hardware interface is | |
826 | strongly in flux, so no good recommendation can be made. | |
827 | ||
5f016456 VG |
828 | config CRASH_DUMP |
829 | bool "kernel crash dumps (EXPERIMENTAL)" | |
5f016456 VG |
830 | depends on EXPERIMENTAL |
831 | depends on HIGHMEM | |
832 | help | |
833 | Generate crash dump after being started by kexec. | |
1edf7778 AK |
834 | This should be normally only set in special crash dump kernels |
835 | which are loaded in the main kernel with kexec-tools into | |
836 | a specially reserved region and then later executed after | |
837 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
838 | to a memory address not used by the main kernel or BIOS using | |
839 | PHYSICAL_START. | |
840 | For more details see Documentation/kdump/kdump.txt | |
05970d47 | 841 | |
dd0ec16f VG |
842 | config PHYSICAL_START |
843 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) | |
d24e3997 | 844 | default "0x1000000" if X86_NUMAQ |
dd0ec16f VG |
845 | default "0x100000" |
846 | help | |
847 | This gives the physical address where the kernel is loaded. | |
848 | ||
849 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
850 | bzImage will decompress itself to above physical address and | |
851 | run from there. Otherwise, bzImage will run from the address where | |
852 | it has been loaded by the boot loader and will ignore above physical | |
853 | address. | |
854 | ||
855 | In normal kdump cases one does not have to set/change this option | |
856 | as now bzImage can be compiled as a completely relocatable image | |
857 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
858 | address. This option is mainly useful for the folks who don't want | |
859 | to use a bzImage for capturing the crash dump and want to use a | |
860 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
861 | to be specifically compiled to run from a specific memory area | |
862 | (normally a reserved region) and this option comes handy. | |
863 | ||
864 | So if you are using bzImage for capturing the crash dump, leave | |
865 | the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y. | |
866 | Otherwise if you plan to use vmlinux for capturing the crash dump | |
867 | change this value to start of the reserved region (Typically 16MB | |
868 | 0x1000000). In other words, it can be set based on the "X" value as | |
869 | specified in the "crashkernel=YM@XM" command line boot parameter | |
870 | passed to the panic-ed kernel. Typically this parameter is set as | |
871 | crashkernel=64M@16M. Please take a look at | |
872 | Documentation/kdump/kdump.txt for more details about crash dumps. | |
873 | ||
874 | Usage of bzImage for capturing the crash dump is recommended as | |
875 | one does not have to build two kernels. Same kernel can be used | |
876 | as production kernel and capture kernel. Above option should have | |
877 | gone away after relocatable bzImage support is introduced. But it | |
878 | is present because there are users out there who continue to use | |
879 | vmlinux for dump capture. This option should go away down the | |
880 | line. | |
881 | ||
882 | Don't change this unless you know what you are doing. | |
883 | ||
968de4f0 | 884 | config RELOCATABLE |
4c7aa6c3 VG |
885 | bool "Build a relocatable kernel(EXPERIMENTAL)" |
886 | depends on EXPERIMENTAL | |
968de4f0 | 887 | help |
fd2dbc92 | 888 | This builds a kernel image that retains relocation information |
968de4f0 | 889 | so it can be loaded someplace besides the default 1MB. |
fd2dbc92 | 890 | The relocations tend to make the kernel binary about 10% larger, |
968de4f0 EB |
891 | but are discarded at runtime. |
892 | ||
893 | One use is for the kexec on panic case where the recovery kernel | |
894 | must live at a different physical address than the primary | |
895 | kernel. | |
896 | ||
e69f202d VG |
897 | config PHYSICAL_ALIGN |
898 | hex "Alignment value to which kernel should be aligned" | |
05970d47 | 899 | default "0x100000" |
e69f202d VG |
900 | range 0x2000 0x400000 |
901 | help | |
902 | This value puts the alignment restrictions on physical address | |
903 | where kernel is loaded and run from. Kernel is compiled for an | |
904 | address which meets above alignment restriction. | |
905 | ||
906 | If bootloader loads the kernel at a non-aligned address and | |
907 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
908 | address aligned to above value and run from there. | |
909 | ||
910 | If bootloader loads the kernel at a non-aligned address and | |
911 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
912 | load address and decompress itself to the address it has been | |
913 | compiled for and run from there. The address for which kernel is | |
914 | compiled already meets above alignment restrictions. Hence the | |
915 | end result is that kernel runs from a physical address meeting | |
916 | above alignment restrictions. | |
05970d47 MS |
917 | |
918 | Don't change this unless you know what you are doing. | |
919 | ||
ce63ad78 | 920 | config HOTPLUG_CPU |
1dbf37e8 | 921 | bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)" |
35076bdf | 922 | depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER |
ce63ad78 | 923 | ---help--- |
b2d596d8 PM |
924 | Say Y here to experiment with turning CPUs off and on, and to |
925 | enable suspend on SMP systems. CPUs can be controlled through | |
926 | /sys/devices/system/cpu. | |
ce63ad78 | 927 | |
e6e5494c IM |
928 | config COMPAT_VDSO |
929 | bool "Compat VDSO support" | |
930 | default y | |
931 | help | |
932 | Map the VDSO to the predictable old-style address too. | |
933 | ---help--- | |
934 | Say N here if you are running a sufficiently recent glibc | |
935 | version (2.3.3 or later), to remove the high-mapped | |
936 | VDSO mapping and to exclusively use the randomized VDSO. | |
937 | ||
938 | If unsure, say Y. | |
ce63ad78 | 939 | |
1da177e4 LT |
940 | endmenu |
941 | ||
cc57637b YG |
942 | config ARCH_ENABLE_MEMORY_HOTPLUG |
943 | def_bool y | |
944 | depends on HIGHMEM | |
1da177e4 LT |
945 | |
946 | menu "Power management options (ACPI, APM)" | |
947 | depends on !X86_VOYAGER | |
948 | ||
949 | source kernel/power/Kconfig | |
950 | ||
951 | source "drivers/acpi/Kconfig" | |
952 | ||
79463318 | 953 | menuconfig APM |
1da177e4 | 954 | tristate "APM (Advanced Power Management) BIOS support" |
63332a9d | 955 | depends on PM_SLEEP && !X86_VISWS |
1da177e4 LT |
956 | ---help--- |
957 | APM is a BIOS specification for saving power using several different | |
958 | techniques. This is mostly useful for battery powered laptops with | |
959 | APM compliant BIOSes. If you say Y here, the system time will be | |
960 | reset after a RESUME operation, the /proc/apm device will provide | |
961 | battery status information, and user-space programs will receive | |
962 | notification of APM "events" (e.g. battery status change). | |
963 | ||
964 | If you select "Y" here, you can disable actual use of the APM | |
965 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
966 | ||
967 | Note that the APM support is almost completely disabled for | |
968 | machines with more than one CPU. | |
969 | ||
970 | In order to use APM, you will need supporting software. For location | |
971 | and more information, read <file:Documentation/pm.txt> and the | |
972 | Battery Powered Linux mini-HOWTO, available from | |
973 | <http://www.tldp.org/docs.html#howto>. | |
974 | ||
975 | This driver does not spin down disk drives (see the hdparm(8) | |
976 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
977 | VESA-compliant "green" monitors. | |
978 | ||
979 | This driver does not support the TI 4000M TravelMate and the ACER | |
980 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
981 | desktop machines also don't have compliant BIOSes, and this driver | |
982 | may cause those machines to panic during the boot phase. | |
983 | ||
984 | Generally, if you don't have a battery in your machine, there isn't | |
985 | much point in using this driver and you should say N. If you get | |
986 | random kernel OOPSes or reboots that don't seem to be related to | |
987 | anything, try disabling/enabling this option (or disabling/enabling | |
988 | APM in your BIOS). | |
989 | ||
990 | Some other things you should try when experiencing seemingly random, | |
991 | "weird" problems: | |
992 | ||
993 | 1) make sure that you have enough swap space and that it is | |
994 | enabled. | |
995 | 2) pass the "no-hlt" option to the kernel | |
996 | 3) switch on floating point emulation in the kernel and pass | |
997 | the "no387" option to the kernel | |
998 | 4) pass the "floppy=nodma" option to the kernel | |
999 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
1000 | all but the first 4 MB of RAM) | |
1001 | 6) make sure that the CPU is not over clocked. | |
1002 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
1003 | 8) disable the cache from your BIOS settings | |
1004 | 9) install a fan for the video card or exchange video RAM | |
1005 | 10) install a better fan for the CPU | |
1006 | 11) exchange RAM chips | |
1007 | 12) exchange the motherboard. | |
1008 | ||
1009 | To compile this driver as a module, choose M here: the | |
1010 | module will be called apm. | |
1011 | ||
79463318 JE |
1012 | if APM |
1013 | ||
1da177e4 LT |
1014 | config APM_IGNORE_USER_SUSPEND |
1015 | bool "Ignore USER SUSPEND" | |
1da177e4 LT |
1016 | help |
1017 | This option will ignore USER SUSPEND requests. On machines with a | |
1018 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
1019 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
1020 | ||
1021 | config APM_DO_ENABLE | |
1022 | bool "Enable PM at boot time" | |
1da177e4 LT |
1023 | ---help--- |
1024 | Enable APM features at boot time. From page 36 of the APM BIOS | |
1025 | specification: "When disabled, the APM BIOS does not automatically | |
1026 | power manage devices, enter the Standby State, enter the Suspend | |
1027 | State, or take power saving steps in response to CPU Idle calls." | |
1028 | This driver will make CPU Idle calls when Linux is idle (unless this | |
1029 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
1030 | should always save battery power, but more complicated APM features | |
1031 | will be dependent on your BIOS implementation. You may need to turn | |
1032 | this option off if your computer hangs at boot time when using APM | |
1033 | support, or if it beeps continuously instead of suspending. Turn | |
1034 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
1035 | T400CDT. This is off by default since most machines do fine without | |
1036 | this feature. | |
1037 | ||
1038 | config APM_CPU_IDLE | |
1039 | bool "Make CPU Idle calls when idle" | |
1da177e4 LT |
1040 | help |
1041 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. | |
1042 | On some machines, this can activate improved power savings, such as | |
1043 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
1044 | are made after the idle loop has run for some length of time (e.g., | |
1045 | 333 mS). On some machines, this will cause a hang at boot time or | |
1046 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
1047 | this option does nothing.) | |
1048 | ||
1049 | config APM_DISPLAY_BLANK | |
1050 | bool "Enable console blanking using APM" | |
1da177e4 LT |
1051 | help |
1052 | Enable console blanking using the APM. Some laptops can use this to | |
1053 | turn off the LCD backlight when the screen blanker of the Linux | |
1054 | virtual console blanks the screen. Note that this is only used by | |
1055 | the virtual console screen blanker, and won't turn off the backlight | |
1056 | when using the X Window system. This also doesn't have anything to | |
1057 | do with your VESA-compliant power-saving monitor. Further, this | |
1058 | option doesn't work for all laptops -- it might not turn off your | |
1059 | backlight at all, or it might print a lot of errors to the console, | |
1060 | especially if you are using gpm. | |
1061 | ||
1da177e4 LT |
1062 | config APM_ALLOW_INTS |
1063 | bool "Allow interrupts during APM BIOS calls" | |
1da177e4 LT |
1064 | help |
1065 | Normally we disable external interrupts while we are making calls to | |
1066 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
1067 | BIOS implementation. The BIOS should reenable interrupts if it | |
1068 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
1069 | many of the newer IBM Thinkpads. If you experience hangs when you | |
1070 | suspend, try setting this to Y. Otherwise, say N. | |
1071 | ||
1072 | config APM_REAL_MODE_POWER_OFF | |
1073 | bool "Use real mode APM BIOS call to power off" | |
1da177e4 LT |
1074 | help |
1075 | Use real mode APM BIOS calls to switch off the computer. This is | |
1076 | a work-around for a number of buggy BIOSes. Switch this option on if | |
1077 | your computer crashes instead of powering off properly. | |
1078 | ||
79463318 | 1079 | endif # APM |
1da177e4 | 1080 | |
ee580dc9 | 1081 | source "arch/x86/kernel/cpu/cpufreq/Kconfig" |
1da177e4 LT |
1082 | |
1083 | endmenu | |
1084 | ||
1085 | menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)" | |
1086 | ||
1087 | config PCI | |
1088 | bool "PCI support" if !X86_VISWS | |
1089 | depends on !X86_VOYAGER | |
1090 | default y if X86_VISWS | |
f282b970 | 1091 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
1da177e4 LT |
1092 | help |
1093 | Find out whether you have a PCI motherboard. PCI is the name of a | |
1094 | bus system, i.e. the way the CPU talks to the other stuff inside | |
1095 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
1096 | VESA. If you have PCI, say Y, otherwise N. | |
1097 | ||
1098 | The PCI-HOWTO, available from | |
1099 | <http://www.tldp.org/docs.html#howto>, contains valuable | |
1100 | information about which PCI hardware does work under Linux and which | |
1101 | doesn't. | |
1102 | ||
1103 | choice | |
1104 | prompt "PCI access mode" | |
1105 | depends on PCI && !X86_VISWS | |
1106 | default PCI_GOANY | |
1107 | ---help--- | |
1108 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
1109 | determine their configuration. However, some old PCI motherboards | |
1110 | have BIOS bugs and may crash if this is done. Also, some embedded | |
1111 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
1112 | detect the PCI hardware directly without using the BIOS. | |
1113 | ||
1114 | With this option, you can specify how Linux should detect the | |
1115 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
1116 | if you choose "Direct", the BIOS won't be used, and if you | |
1117 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
1118 | If you choose "Any", the kernel will try MMCONFIG, then the | |
1119 | direct access method and falls back to the BIOS if that doesn't | |
1120 | work. If unsure, go with the default, which is "Any". | |
1121 | ||
1122 | config PCI_GOBIOS | |
1123 | bool "BIOS" | |
1124 | ||
1125 | config PCI_GOMMCONFIG | |
1126 | bool "MMConfig" | |
1127 | ||
1128 | config PCI_GODIRECT | |
1129 | bool "Direct" | |
1130 | ||
1131 | config PCI_GOANY | |
1132 | bool "Any" | |
1133 | ||
1134 | endchoice | |
1135 | ||
1136 | config PCI_BIOS | |
1137 | bool | |
1138 | depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY) | |
1139 | default y | |
1140 | ||
1141 | config PCI_DIRECT | |
1142 | bool | |
1143 | depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS) | |
1144 | default y | |
1145 | ||
1146 | config PCI_MMCONFIG | |
1147 | bool | |
8aadff7d | 1148 | depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY) |
1da177e4 LT |
1149 | default y |
1150 | ||
a79e4198 JG |
1151 | config PCI_DOMAINS |
1152 | bool | |
1153 | depends on PCI | |
1154 | default y | |
1155 | ||
1da177e4 LT |
1156 | source "drivers/pci/pcie/Kconfig" |
1157 | ||
1158 | source "drivers/pci/Kconfig" | |
1159 | ||
5cae841b AV |
1160 | config ISA_DMA_API |
1161 | bool | |
1162 | default y | |
1163 | ||
1da177e4 LT |
1164 | config ISA |
1165 | bool "ISA support" | |
1166 | depends on !(X86_VOYAGER || X86_VISWS) | |
1167 | help | |
1168 | Find out whether you have ISA slots on your motherboard. ISA is the | |
1169 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
1170 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
1171 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
1172 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
1173 | ||
1174 | config EISA | |
1175 | bool "EISA support" | |
1176 | depends on ISA | |
1177 | ---help--- | |
1178 | The Extended Industry Standard Architecture (EISA) bus was | |
1179 | developed as an open alternative to the IBM MicroChannel bus. | |
1180 | ||
1181 | The EISA bus provided some of the features of the IBM MicroChannel | |
1182 | bus while maintaining backward compatibility with cards made for | |
1183 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
1184 | 1995 when it was made obsolete by the PCI bus. | |
1185 | ||
1186 | Say Y here if you are building a kernel for an EISA-based machine. | |
1187 | ||
1188 | Otherwise, say N. | |
1189 | ||
1190 | source "drivers/eisa/Kconfig" | |
1191 | ||
1192 | config MCA | |
1193 | bool "MCA support" if !(X86_VISWS || X86_VOYAGER) | |
1194 | default y if X86_VOYAGER | |
1195 | help | |
1196 | MicroChannel Architecture is found in some IBM PS/2 machines and | |
1197 | laptops. It is a bus system similar to PCI or ISA. See | |
1198 | <file:Documentation/mca.txt> (and especially the web page given | |
1199 | there) before attempting to build an MCA bus kernel. | |
1200 | ||
1201 | source "drivers/mca/Kconfig" | |
1202 | ||
1203 | config SCx200 | |
1204 | tristate "NatSemi SCx200 support" | |
1205 | depends on !X86_VOYAGER | |
1206 | help | |
6ae7440e JC |
1207 | This provides basic support for National Semiconductor's |
1208 | (now AMD's) Geode processors. The driver probes for the | |
1209 | PCI-IDs of several on-chip devices, so its a good dependency | |
1210 | for other scx200_* drivers. | |
1da177e4 | 1211 | |
6ae7440e | 1212 | If compiled as a module, the driver is named scx200. |
1da177e4 | 1213 | |
6ae7440e JC |
1214 | config SCx200HR_TIMER |
1215 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
1216 | depends on SCx200 && GENERIC_TIME | |
1217 | default y | |
1218 | help | |
1219 | This driver provides a clocksource built upon the on-chip | |
1220 | 27MHz high-resolution timer. Its also a workaround for | |
1221 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
1222 | processor goes idle (as is done by the scheduler). The | |
1223 | other workaround is idle=poll boot option. | |
1da177e4 | 1224 | |
8f36881b AS |
1225 | config GEODE_MFGPT_TIMER |
1226 | bool "Geode Multi-Function General Purpose Timer (MFGPT) events" | |
1227 | depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS | |
1228 | default y | |
1229 | help | |
1230 | This driver provides a clock event source based on the MFGPT | |
1231 | timer(s) in the CS5535 and CS5536 companion chip for the geode. | |
1232 | MFGPTs have a better resolution and max interval than the | |
1233 | generic PIT, and are suitable for use as high-res timers. | |
1234 | ||
a32073bf AK |
1235 | config K8_NB |
1236 | def_bool y | |
1237 | depends on AGP_AMD64 | |
1238 | ||
1da177e4 LT |
1239 | source "drivers/pcmcia/Kconfig" |
1240 | ||
1241 | source "drivers/pci/hotplug/Kconfig" | |
1242 | ||
1243 | endmenu | |
1244 | ||
1245 | menu "Executable file formats" | |
1246 | ||
1247 | source "fs/Kconfig.binfmt" | |
1248 | ||
1249 | endmenu | |
1250 | ||
d5950b43 SR |
1251 | source "net/Kconfig" |
1252 | ||
1da177e4 LT |
1253 | source "drivers/Kconfig" |
1254 | ||
1255 | source "fs/Kconfig" | |
1256 | ||
2a07c8f9 JE |
1257 | menuconfig INSTRUMENTATION |
1258 | bool "Instrumentation Support" | |
cd6b0762 | 1259 | depends on EXPERIMENTAL |
2a07c8f9 | 1260 | default y |
06bfb7eb JE |
1261 | ---help--- |
1262 | Say Y here to get to see options related to performance measurement, | |
1263 | debugging, and testing. This option alone does not add any kernel code. | |
1264 | ||
1265 | If you say N, all options in this submenu will be skipped and disabled. | |
2a07c8f9 JE |
1266 | |
1267 | if INSTRUMENTATION | |
cd6b0762 | 1268 | |
ff439565 | 1269 | source "arch/x86/oprofile/Kconfig" |
1da177e4 | 1270 | |
cd6b0762 | 1271 | config KPROBES |
87a7defb AM |
1272 | bool "Kprobes" |
1273 | depends on KALLSYMS && MODULES | |
cd6b0762 PP |
1274 | help |
1275 | Kprobes allows you to trap at almost any kernel address and | |
1276 | execute a callback function. register_kprobe() establishes | |
1277 | a probepoint and specifies the callback. Kprobes is useful | |
1278 | for kernel debugging, non-intrusive instrumentation and testing. | |
1279 | If in doubt, say "N". | |
2a07c8f9 JE |
1280 | |
1281 | endif # INSTRUMENTATION | |
cd6b0762 | 1282 | |
1da177e4 LT |
1283 | source "arch/i386/Kconfig.debug" |
1284 | ||
1285 | source "security/Kconfig" | |
1286 | ||
1287 | source "crypto/Kconfig" | |
1288 | ||
1289 | source "lib/Kconfig" | |
1290 | ||
1291 | # | |
1292 | # Use the generic interrupt handling code in kernel/irq/: | |
1293 | # | |
1294 | config GENERIC_HARDIRQS | |
1295 | bool | |
1296 | default y | |
1297 | ||
1298 | config GENERIC_IRQ_PROBE | |
1299 | bool | |
1300 | default y | |
1301 | ||
54d5d424 AR |
1302 | config GENERIC_PENDING_IRQ |
1303 | bool | |
1304 | depends on GENERIC_HARDIRQS && SMP | |
1305 | default y | |
1306 | ||
1da177e4 LT |
1307 | config X86_SMP |
1308 | bool | |
1309 | depends on SMP && !X86_VOYAGER | |
1310 | default y | |
1311 | ||
1312 | config X86_HT | |
1313 | bool | |
1314 | depends on SMP && !(X86_VISWS || X86_VOYAGER) | |
1315 | default y | |
1316 | ||
1317 | config X86_BIOS_REBOOT | |
1318 | bool | |
1319 | depends on !(X86_VISWS || X86_VOYAGER) | |
1320 | default y | |
1321 | ||
1322 | config X86_TRAMPOLINE | |
1323 | bool | |
1324 | depends on X86_SMP || (X86_VOYAGER && SMP) | |
1325 | default y | |
97fc79f9 TG |
1326 | |
1327 | config KTIME_SCALAR | |
1328 | bool | |
1329 | default y |