/arch/i386/Kconfig

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see Documentation/kbuild/kconfig-language.txt.
  4. #
  5. mainmenu "Linux Kernel Configuration"
  6. config X86
  7. bool
  8. default y
  9. help
  10. This is Linux's home port. Linux was originally native to the Intel
  11. 386, and runs on all the later x86 processors including the Intel
  12. 486, 586, Pentiums, and various instruction-set-compatible chips by
  13. AMD, Cyrix, and others.
  14. config MMU
  15. bool
  16. default y
  17. config SBUS
  18. bool
  19. config UID16
  20. bool
  21. default y
  22. config GENERIC_ISA_DMA
  23. bool
  24. default y
  25. config GENERIC_IOMAP
  26. bool
  27. default y
  28. source "init/Kconfig"
  29. menu "Processor type and features"
  30. choice
  31. prompt "Subarchitecture Type"
  32. default X86_PC
  33. config X86_PC
  34. bool "PC-compatible"
  35. help
  36. Choose this option if your computer is a standard PC or compatible.
  37. config X86_ELAN
  38. bool "AMD Elan"
  39. help
  40. Select this for an AMD Elan processor.
  41. Do not use this option for K6/Athlon/Opteron processors!
  42. If unsure, choose "PC-compatible" instead.
  43. config X86_VOYAGER
  44. bool "Voyager (NCR)"
  45. help
  46. Voyager is an MCA-based 32-way capable SMP architecture proprietary
  47. to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
  48. *** WARNING ***
  49. If you do not specifically know you have a Voyager based machine,
  50. say N here, otherwise the kernel you build will not be bootable.
  51. config X86_NUMAQ
  52. bool "NUMAQ (IBM/Sequent)"
  53. select DISCONTIGMEM
  54. select NUMA
  55. help
  56. This option is used for getting Linux to run on a (IBM/Sequent) NUMA
  57. multiquad box. This changes the way that processors are bootstrapped,
  58. and uses Clustered Logical APIC addressing mode instead of Flat Logical.
  59. You will need a new lynxer.elf file to flash your firmware with - send
  60. email to <Martin.Bligh@us.ibm.com>.
  61. config X86_SUMMIT
  62. bool "Summit/EXA (IBM x440)"
  63. depends on SMP
  64. help
  65. This option is needed for IBM systems that use the Summit/EXA chipset.
  66. In particular, it is needed for the x440.
  67. If you don't have one of these computers, you should say N here.
  68. config X86_BIGSMP
  69. bool "Support for other sub-arch SMP systems with more than 8 CPUs"
  70. depends on SMP
  71. help
  72. This option is needed for the systems that have more than 8 CPUs
  73. and if the system is not of any sub-arch type above.
  74. If you don't have such a system, you should say N here.
  75. config X86_VISWS
  76. bool "SGI 320/540 (Visual Workstation)"
  77. help
  78. The SGI Visual Workstation series is an IA32-based workstation
  79. based on SGI systems chips with some legacy PC hardware attached.
  80. Say Y here to create a kernel to run on the SGI 320 or 540.
  81. A kernel compiled for the Visual Workstation will not run on PCs
  82. and vice versa. See <file:Documentation/sgi-visws.txt> for details.
  83. config X86_GENERICARCH
  84. bool "Generic architecture (Summit, bigsmp, ES7000, default)"
  85. depends on SMP
  86. help
  87. This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
  88. It is intended for a generic binary kernel.
  89. config X86_ES7000
  90. bool "Support for Unisys ES7000 IA32 series"
  91. depends on SMP
  92. help
  93. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  94. supposed to run on an IA32-based Unisys ES7000 system.
  95. Only choose this option if you have such a system, otherwise you
  96. should say N here.
  97. endchoice
  98. config ACPI_SRAT
  99. bool
  100. default y
  101. depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
  102. config X86_SUMMIT_NUMA
  103. bool
  104. default y
  105. depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
  106. config X86_CYCLONE_TIMER
  107. bool
  108. default y
  109. depends on X86_SUMMIT || X86_GENERICARCH
  110. config ES7000_CLUSTERED_APIC
  111. bool
  112. default y
  113. depends on SMP && X86_ES7000 && MPENTIUMIII
  114. if !X86_ELAN
  115. choice
  116. prompt "Processor family"
  117. default M686
  118. config M386
  119. bool "386"
  120. ---help---
  121. This is the processor type of your CPU. This information is used for
  122. optimizing purposes. In order to compile a kernel that can run on
  123. all x86 CPU types (albeit not optimally fast), you can specify
  124. "386" here.
  125. The kernel will not necessarily run on earlier architectures than
  126. the one you have chosen, e.g. a Pentium optimized kernel will run on
  127. a PPro, but not necessarily on a i486.
  128. Here are the settings recommended for greatest speed:
  129. - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
  130. 486DLC/DLC2, UMC 486SX-S and NexGen Nx586. Only "386" kernels
  131. will run on a 386 class machine.
  132. - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
  133. SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  134. - "586" for generic Pentium CPUs lacking the TSC
  135. (time stamp counter) register.
  136. - "Pentium-Classic" for the Intel Pentium.
  137. - "Pentium-MMX" for the Intel Pentium MMX.
  138. - "Pentium-Pro" for the Intel Pentium Pro.
  139. - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
  140. - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
  141. - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
  142. - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
  143. - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
  144. - "Crusoe" for the Transmeta Crusoe series.
  145. - "Efficeon" for the Transmeta Efficeon series.
  146. - "Winchip-C6" for original IDT Winchip.
  147. - "Winchip-2" for IDT Winchip 2.
  148. - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
  149. - "MediaGX/Geode" for Cyrix MediaGX aka Geode.
  150. - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
  151. - "VIA C3-2 for VIA C3-2 "Nehemiah" (model 9 and above).
  152. If you don't know what to do, choose "386".
  153. config M486
  154. bool "486"
  155. help
  156. Select this for a 486 series processor, either Intel or one of the
  157. compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX,
  158. DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
  159. U5S.
  160. config M586
  161. bool "586/K5/5x86/6x86/6x86MX"
  162. help
  163. Select this for an 586 or 686 series processor such as the AMD K5,
  164. the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
  165. assume the RDTSC (Read Time Stamp Counter) instruction.
  166. config M586TSC
  167. bool "Pentium-Classic"
  168. help
  169. Select this for a Pentium Classic processor with the RDTSC (Read
  170. Time Stamp Counter) instruction for benchmarking.
  171. config M586MMX
  172. bool "Pentium-MMX"
  173. help
  174. Select this for a Pentium with the MMX graphics/multimedia
  175. extended instructions.
  176. config M686
  177. bool "Pentium-Pro"
  178. help
  179. Select this for Intel Pentium Pro chips. This enables the use of
  180. Pentium Pro extended instructions, and disables the init-time guard
  181. against the f00f bug found in earlier Pentiums.
  182. config MPENTIUMII
  183. bool "Pentium-II/Celeron(pre-Coppermine)"
  184. help
  185. Select this for Intel chips based on the Pentium-II and
  186. pre-Coppermine Celeron core. This option enables an unaligned
  187. copy optimization, compiles the kernel with optimization flags
  188. tailored for the chip, and applies any applicable Pentium Pro
  189. optimizations.
  190. config MPENTIUMIII
  191. bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
  192. help
  193. Select this for Intel chips based on the Pentium-III and
  194. Celeron-Coppermine core. This option enables use of some
  195. extended prefetch instructions in addition to the Pentium II
  196. extensions.
  197. config MPENTIUMM
  198. bool "Pentium M"
  199. help
  200. Select this for Intel Pentium M (not Pentium-4 M)
  201. notebook chips.
  202. config MPENTIUM4
  203. bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon"
  204. help
  205. Select this for Intel Pentium 4 chips. This includes the
  206. Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
  207. (not Pentium M) chips. This option enables compile flags
  208. optimized for the chip, uses the correct cache shift, and
  209. applies any applicable Pentium III optimizations.
  210. config MK6
  211. bool "K6/K6-II/K6-III"
  212. help
  213. Select this for an AMD K6-family processor. Enables use of
  214. some extended instructions, and passes appropriate optimization
  215. flags to GCC.
  216. config MK7
  217. bool "Athlon/Duron/K7"
  218. help
  219. Select this for an AMD Athlon K7-family processor. Enables use of
  220. some extended instructions, and passes appropriate optimization
  221. flags to GCC.
  222. config MK8
  223. bool "Opteron/Athlon64/Hammer/K8"
  224. help
  225. Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables
  226. use of some extended instructions, and passes appropriate optimization
  227. flags to GCC.
  228. config MCRUSOE
  229. bool "Crusoe"
  230. help
  231. Select this for a Transmeta Crusoe processor. Treats the processor
  232. like a 586 with TSC, and sets some GCC optimization flags (like a
  233. Pentium Pro with no alignment requirements).
  234. config MEFFICEON
  235. bool "Efficeon"
  236. help
  237. Select this for a Transmeta Efficeon processor.
  238. config MWINCHIPC6
  239. bool "Winchip-C6"
  240. help
  241. Select this for an IDT Winchip C6 chip. Linux and GCC
  242. treat this chip as a 586TSC with some extended instructions
  243. and alignment requirements.
  244. config MWINCHIP2
  245. bool "Winchip-2"
  246. help
  247. Select this for an IDT Winchip-2. Linux and GCC
  248. treat this chip as a 586TSC with some extended instructions
  249. and alignment requirements.
  250. config MWINCHIP3D
  251. bool "Winchip-2A/Winchip-3"
  252. help
  253. Select this for an IDT Winchip-2A or 3. Linux and GCC
  254. treat this chip as a 586TSC with some extended instructions
  255. and alignment reqirements. Also enable out of order memory
  256. stores for this CPU, which can increase performance of some
  257. operations.
  258. config MGEODE
  259. bool "MediaGX/Geode"
  260. help
  261. Select this for a Cyrix MediaGX aka Geode chip. Linux and GCC
  262. treat this chip as a 586TSC with some extended instructions
  263. and alignment reqirements.
  264. config MCYRIXIII
  265. bool "CyrixIII/VIA-C3"
  266. help
  267. Select this for a Cyrix III or C3 chip. Presently Linux and GCC
  268. treat this chip as a generic 586. Whilst the CPU is 686 class,
  269. it lacks the cmov extension which gcc assumes is present when
  270. generating 686 code.
  271. Note that Nehemiah (Model 9) and above will not boot with this
  272. kernel due to them lacking the 3DNow! instructions used in earlier
  273. incarnations of the CPU.
  274. config MVIAC3_2
  275. bool "VIA C3-2 (Nehemiah)"
  276. help
  277. Select this for a VIA C3 "Nehemiah". Selecting this enables usage
  278. of SSE and tells gcc to treat the CPU as a 686.
  279. Note, this kernel will not boot on older (pre model 9) C3s.
  280. endchoice
  281. config X86_GENERIC
  282. bool "Generic x86 support"
  283. help
  284. Instead of just including optimizations for the selected
  285. x86 variant (e.g. PII, Crusoe or Athlon), include some more
  286. generic optimizations as well. This will make the kernel
  287. perform better on x86 CPUs other than that selected.
  288. This is really intended for distributors who need more
  289. generic optimizations.
  290. endif
  291. #
  292. # Define implied options from the CPU selection here
  293. #
  294. config X86_CMPXCHG
  295. bool
  296. depends on !M386
  297. default y
  298. config X86_XADD
  299. bool
  300. depends on !M386
  301. default y
  302. config X86_L1_CACHE_SHIFT
  303. int
  304. default "7" if MPENTIUM4 || X86_GENERIC
  305. default "4" if X86_ELAN || M486 || M386
  306. default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE
  307. default "6" if MK7 || MK8 || MPENTIUMM
  308. config RWSEM_GENERIC_SPINLOCK
  309. bool
  310. depends on M386
  311. default y
  312. config RWSEM_XCHGADD_ALGORITHM
  313. bool
  314. depends on !M386
  315. default y
  316. config GENERIC_CALIBRATE_DELAY
  317. bool
  318. default y
  319. config X86_PPRO_FENCE
  320. bool
  321. depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODE
  322. default y
  323. config X86_F00F_BUG
  324. bool
  325. depends on M586MMX || M586TSC || M586 || M486 || M386
  326. default y
  327. config X86_WP_WORKS_OK
  328. bool
  329. depends on !M386
  330. default y
  331. config X86_INVLPG
  332. bool
  333. depends on !M386
  334. default y
  335. config X86_BSWAP
  336. bool
  337. depends on !M386
  338. default y
  339. config X86_POPAD_OK
  340. bool
  341. depends on !M386
  342. default y
  343. config X86_ALIGNMENT_16
  344. bool
  345. depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODE
  346. default y
  347. config X86_GOOD_APIC
  348. bool
  349. depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON
  350. default y
  351. config X86_INTEL_USERCOPY
  352. bool
  353. depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON
  354. default y
  355. config X86_USE_PPRO_CHECKSUM
  356. bool
  357. depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON
  358. default y
  359. config X86_USE_3DNOW
  360. bool
  361. depends on MCYRIXIII || MK7
  362. default y
  363. config X86_OOSTORE
  364. bool
  365. depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MGEODE) && MTRR
  366. default y
  367. config HPET_TIMER
  368. bool "HPET Timer Support"
  369. help
  370. This enables the use of the HPET for the kernel's internal timer.
  371. HPET is the next generation timer replacing legacy 8254s.
  372. You can safely choose Y here. However, HPET will only be
  373. activated if the platform and the BIOS support this feature.
  374. Otherwise the 8254 will be used for timing services.
  375. Choose N to continue using the legacy 8254 timer.
  376. config HPET_EMULATE_RTC
  377. bool "Provide RTC interrupt"
  378. depends on HPET_TIMER && RTC=y
  379. config SMP
  380. bool "Symmetric multi-processing support"
  381. ---help---
  382. This enables support for systems with more than one CPU. If you have
  383. a system with only one CPU, like most personal computers, say N. If
  384. you have a system with more than one CPU, say Y.
  385. If you say N here, the kernel will run on single and multiprocessor
  386. machines, but will use only one CPU of a multiprocessor machine. If
  387. you say Y here, the kernel will run on many, but not all,
  388. singleprocessor machines. On a singleprocessor machine, the kernel
  389. will run faster if you say N here.
  390. Note that if you say Y here and choose architecture "586" or
  391. "Pentium" under "Processor family", the kernel will not work on 486
  392. architectures. Similarly, multiprocessor kernels for the "PPro"
  393. architecture may not work on all Pentium based boards.
  394. People using multiprocessor machines who say Y here should also say
  395. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  396. Management" code will be disabled if you say Y here.
  397. See also the <file:Documentation/smp.txt>,
  398. <file:Documentation/i386/IO-APIC.txt>,
  399. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  400. <http://www.tldp.org/docs.html#howto>.
  401. If you don't know what to do here, say N.
  402. config NR_CPUS
  403. int "Maximum number of CPUs (2-255)"
  404. range 2 255
  405. depends on SMP
  406. default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
  407. default "8"
  408. help
  409. This allows you to specify the maximum number of CPUs which this
  410. kernel will support. The maximum supported value is 255 and the
  411. minimum value which makes sense is 2.
  412. This is purely to save memory - each supported CPU adds
  413. approximately eight kilobytes to the kernel image.
  414. config SCHED_SMT
  415. bool "SMT (Hyperthreading) scheduler support"
  416. depends on SMP
  417. default off
  418. help
  419. SMT scheduler support improves the CPU scheduler's decision making
  420. when dealing with Intel Pentium 4 chips with HyperThreading at a
  421. cost of slightly increased overhead in some places. If unsure say
  422. N here.
  423. config PREEMPT
  424. bool "Preemptible Kernel"
  425. help
  426. This option reduces the latency of the kernel when reacting to
  427. real-time or interactive events by allowing a low priority process to
  428. be preempted even if it is in kernel mode executing a system call.
  429. This allows applications to run more reliably even when the system is
  430. under load.
  431. Say Y here if you are building a kernel for a desktop, embedded
  432. or real-time system. Say N if you are unsure.
  433. config PREEMPT_BKL
  434. bool "Preempt The Big Kernel Lock"
  435. depends on PREEMPT
  436. default y
  437. help
  438. This option reduces the latency of the kernel by making the
  439. big kernel lock preemptible.
  440. Say Y here if you are building a kernel for a desktop system.
  441. Say N if you are unsure.
  442. config X86_UP_APIC
  443. bool "Local APIC support on uniprocessors"
  444. depends on !SMP && !(X86_VISWS || X86_VOYAGER)
  445. help
  446. A local APIC (Advanced Programmable Interrupt Controller) is an
  447. integrated interrupt controller in the CPU. If you have a single-CPU
  448. system which has a processor with a local APIC, you can say Y here to
  449. enable and use it. If you say Y here even though your machine doesn't
  450. have a local APIC, then the kernel will still run with no slowdown at
  451. all. The local APIC supports CPU-generated self-interrupts (timer,
  452. performance counters), and the NMI watchdog which detects hard
  453. lockups.
  454. config X86_UP_IOAPIC
  455. bool "IO-APIC support on uniprocessors"
  456. depends on X86_UP_APIC
  457. help
  458. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  459. SMP-capable replacement for PC-style interrupt controllers. Most
  460. SMP systems and many recent uniprocessor systems have one.
  461. If you have a single-CPU system with an IO-APIC, you can say Y here
  462. to use it. If you say Y here even though your machine doesn't have
  463. an IO-APIC, then the kernel will still run with no slowdown at all.
  464. config X86_LOCAL_APIC
  465. bool
  466. depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER)
  467. default y
  468. config X86_IO_APIC
  469. bool
  470. depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
  471. default y
  472. config X86_VISWS_APIC
  473. bool
  474. depends on X86_VISWS
  475. default y
  476. config X86_TSC
  477. bool
  478. depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODE) && !X86_NUMAQ
  479. default y
  480. config X86_MCE
  481. bool "Machine Check Exception"
  482. depends on !X86_VOYAGER
  483. ---help---
  484. Machine Check Exception support allows the processor to notify the
  485. kernel if it detects a problem (e.g. overheating, component failure).
  486. The action the kernel takes depends on the severity of the problem,
  487. ranging from a warning message on the console, to halting the machine.
  488. Your processor must be a Pentium or newer to support this - check the
  489. flags in /proc/cpuinfo for mce. Note that some older Pentium systems
  490. have a design flaw which leads to false MCE events - hence MCE is
  491. disabled on all P5 processors, unless explicitly enabled with "mce"
  492. as a boot argument. Similarly, if MCE is built in and creates a
  493. problem on some new non-standard machine, you can boot with "nomce"
  494. to disable it. MCE support simply ignores non-MCE processors like
  495. the 386 and 486, so nearly everyone can say Y here.
  496. config X86_MCE_NONFATAL
  497. tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
  498. depends on X86_MCE
  499. help
  500. Enabling this feature starts a timer that triggers every 5 seconds which
  501. will look at the machine check registers to see if anything happened.
  502. Non-fatal problems automatically get corrected (but still logged).
  503. Disable this if you don't want to see these messages.
  504. Seeing the messages this option prints out may be indicative of dying hardware,
  505. or out-of-spec (ie, overclocked) hardware.
  506. This option only does something on certain CPUs.
  507. (AMD Athlon/Duron and Intel Pentium 4)
  508. config X86_MCE_P4THERMAL
  509. bool "check for P4 thermal throttling interrupt."
  510. depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
  511. help
  512. Enabling this feature will cause a message to be printed when the P4
  513. enters thermal throttling.
  514. config TOSHIBA
  515. tristate "Toshiba Laptop support"
  516. ---help---
  517. This adds a driver to safely access the System Management Mode of
  518. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  519. not work on models with a Phoenix BIOS. The System Management Mode
  520. is used to set the BIOS and power saving options on Toshiba portables.
  521. For information on utilities to make use of this driver see the
  522. Toshiba Linux utilities web site at:
  523. <http://www.buzzard.org.uk/toshiba/>.
  524. Say Y if you intend to run this kernel on a Toshiba portable.
  525. Say N otherwise.
  526. config I8K
  527. tristate "Dell laptop support"
  528. ---help---
  529. This adds a driver to safely access the System Management Mode
  530. of the CPU on the Dell Inspiron 8000. The System Management Mode
  531. is used to read cpu temperature and cooling fan status and to
  532. control the fans on the I8K portables.
  533. This driver has been tested only on the Inspiron 8000 but it may
  534. also work with other Dell laptops. You can force loading on other
  535. models by passing the parameter `force=1' to the module. Use at
  536. your own risk.
  537. For information on utilities to make use of this driver see the
  538. I8K Linux utilities web site at:
  539. <http://people.debian.org/~dz/i8k/>
  540. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  541. Say N otherwise.
  542. config MICROCODE
  543. tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
  544. ---help---
  545. If you say Y here and also to "/dev file system support" in the
  546. 'File systems' section, you will be able to update the microcode on
  547. Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
  548. Pentium III, Pentium 4, Xeon etc. You will obviously need the
  549. actual microcode binary data itself which is not shipped with the
  550. Linux kernel.
  551. For latest news and information on obtaining all the required
  552. ingredients for this driver, check:
  553. <http://www.urbanmyth.org/microcode/>.
  554. To compile this driver as a module, choose M here: the
  555. module will be called microcode.
  556. config X86_MSR
  557. tristate "/dev/cpu/*/msr - Model-specific register support"
  558. help
  559. This device gives privileged processes access to the x86
  560. Model-Specific Registers (MSRs). It is a character device with
  561. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  562. MSR accesses are directed to a specific CPU on multi-processor
  563. systems.
  564. config X86_CPUID
  565. tristate "/dev/cpu/*/cpuid - CPU information support"
  566. help
  567. This device gives processes access to the x86 CPUID instruction to
  568. be executed on a specific processor. It is a character device
  569. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  570. /dev/cpu/31/cpuid.
  571. source "drivers/firmware/Kconfig"
  572. choice
  573. prompt "High Memory Support"
  574. default NOHIGHMEM
  575. config NOHIGHMEM
  576. bool "off"
  577. ---help---
  578. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  579. However, the address space of 32-bit x86 processors is only 4
  580. Gigabytes large. That means that, if you have a large amount of
  581. physical memory, not all of it can be "permanently mapped" by the
  582. kernel. The physical memory that's not permanently mapped is called
  583. "high memory".
  584. If you are compiling a kernel which will never run on a machine with
  585. more than 1 Gigabyte total physical RAM, answer "off" here (default
  586. choice and suitable for most users). This will result in a "3GB/1GB"
  587. split: 3GB are mapped so that each process sees a 3GB virtual memory
  588. space and the remaining part of the 4GB virtual memory space is used
  589. by the kernel to permanently map as much physical memory as
  590. possible.
  591. If the machine has between 1 and 4 Gigabytes physical RAM, then
  592. answer "4GB" here.
  593. If more than 4 Gigabytes is used then answer "64GB" here. This
  594. selection turns Intel PAE (Physical Address Extension) mode on.
  595. PAE implements 3-level paging on IA32 processors. PAE is fully
  596. supported by Linux, PAE mode is implemented on all recent Intel
  597. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  598. then the kernel will not boot on CPUs that don't support PAE!
  599. The actual amount of total physical memory will either be
  600. auto detected or can be forced by using a kernel command line option
  601. such as "mem=256M". (Try "man bootparam" or see the documentation of
  602. your boot loader (lilo or loadlin) about how to pass options to the
  603. kernel at boot time.)
  604. If unsure, say "off".
  605. config HIGHMEM4G
  606. bool "4GB"
  607. help
  608. Select this if you have a 32-bit processor and between 1 and 4
  609. gigabytes of physical RAM.
  610. config HIGHMEM64G
  611. bool "64GB"
  612. help
  613. Select this if you have a 32-bit processor and more than 4
  614. gigabytes of physical RAM.
  615. endchoice
  616. config HIGHMEM
  617. bool
  618. depends on HIGHMEM64G || HIGHMEM4G
  619. default y
  620. config X86_PAE
  621. bool
  622. depends on HIGHMEM64G
  623. default y
  624. # Common NUMA Features
  625. config NUMA
  626. bool "Numa Memory Allocation and Scheduler Support"
  627. depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
  628. default n if X86_PC
  629. default y if (X86_NUMAQ || X86_SUMMIT)
  630. # Need comments to help the hapless user trying to turn on NUMA support
  631. comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"
  632. depends on X86_NUMAQ && (!HIGHMEM64G || !SMP)
  633. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  634. depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  635. config DISCONTIGMEM
  636. bool
  637. depends on NUMA
  638. default y
  639. config HAVE_ARCH_BOOTMEM_NODE
  640. bool
  641. depends on NUMA
  642. default y
  643. config HAVE_MEMORY_PRESENT
  644. bool
  645. depends on DISCONTIGMEM
  646. default y
  647. config NEED_NODE_MEMMAP_SIZE
  648. bool
  649. depends on DISCONTIGMEM
  650. default y
  651. config HIGHPTE
  652. bool "Allocate 3rd-level pagetables from highmem"
  653. depends on HIGHMEM4G || HIGHMEM64G
  654. help
  655. The VM uses one page table entry for each page of physical memory.
  656. For systems with a lot of RAM, this can be wasteful of precious
  657. low memory. Setting this option will put user-space page table
  658. entries in high memory.
  659. config MATH_EMULATION
  660. bool "Math emulation"
  661. ---help---
  662. Linux can emulate a math coprocessor (used for floating point
  663. operations) if you don't have one. 486DX and Pentium processors have
  664. a math coprocessor built in, 486SX and 386 do not, unless you added
  665. a 487DX or 387, respectively. (The messages during boot time can
  666. give you some hints here ["man dmesg"].) Everyone needs either a
  667. coprocessor or this emulation.
  668. If you don't have a math coprocessor, you need to say Y here; if you
  669. say Y here even though you have a coprocessor, the coprocessor will
  670. be used nevertheless. (This behavior can be changed with the kernel
  671. command line option "no387", which comes handy if your coprocessor
  672. is broken. Try "man bootparam" or see the documentation of your boot
  673. loader (lilo or loadlin) about how to pass options to the kernel at
  674. boot time.) This means that it is a good idea to say Y here if you
  675. intend to use this kernel on different machines.
  676. More information about the internals of the Linux math coprocessor
  677. emulation can be found in <file:arch/i386/math-emu/README>.
  678. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  679. kernel, it won't hurt.
  680. config MTRR
  681. bool "MTRR (Memory Type Range Register) support"
  682. ---help---
  683. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  684. the Memory Type Range Registers (MTRRs) may be used to control
  685. processor access to memory ranges. This is most useful if you have
  686. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  687. allows bus write transfers to be combined into a larger transfer
  688. before bursting over the PCI/AGP bus. This can increase performance
  689. of image write operations 2.5 times or more. Saying Y here creates a
  690. /proc/mtrr file which may be used to manipulate your processor's
  691. MTRRs. Typically the X server should use this.
  692. This code has a reasonably generic interface so that similar
  693. control registers on other processors can be easily supported
  694. as well:
  695. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  696. Registers (ARRs) which provide a similar functionality to MTRRs. For
  697. these, the ARRs are used to emulate the MTRRs.
  698. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  699. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  700. write-combining. All of these processors are supported by this code
  701. and it makes sense to say Y here if you have one of them.
  702. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  703. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  704. can lead to all sorts of problems, so it's good to say Y here.
  705. You can safely say Y even if your machine doesn't have MTRRs, you'll
  706. just add about 9 KB to your kernel.
  707. See <file:Documentation/mtrr.txt> for more information.
  708. config EFI
  709. bool "Boot from EFI support (EXPERIMENTAL)"
  710. depends on ACPI
  711. default n
  712. ---help---
  713. This enables the the kernel to boot on EFI platforms using
  714. system configuration information passed to it from the firmware.
  715. This also enables the kernel to use any EFI runtime services that are
  716. available (such as the EFI variable services).
  717. This option is only useful on systems that have EFI firmware
  718. and will result in a kernel image that is ~8k larger. In addition,
  719. you must use the latest ELILO loader available at
  720. <http://elilo.sourceforge.net> in order to take advantage of
  721. kernel initialization using EFI information (neither GRUB nor LILO know
  722. anything about EFI). However, even with this option, the resultant
  723. kernel should continue to boot on existing non-EFI platforms.
  724. config IRQBALANCE
  725. bool "Enable kernel irq balancing"
  726. depends on SMP && X86_IO_APIC
  727. default y
  728. help
  729. The default yes will allow the kernel to do irq load balancing.
  730. Saying no will keep the kernel from doing irq load balancing.
  731. config HAVE_DEC_LOCK
  732. bool
  733. depends on (SMP || PREEMPT) && X86_CMPXCHG
  734. default y
  735. # turning this on wastes a bunch of space.
  736. # Summit needs it only when NUMA is on
  737. config BOOT_IOREMAP
  738. bool
  739. depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
  740. default y
  741. config REGPARM
  742. bool "Use register arguments (EXPERIMENTAL)"
  743. depends on EXPERIMENTAL
  744. default n
  745. help
  746. Compile the kernel with -mregparm=3. This uses a different ABI
  747. and passes the first three arguments of a function call in registers.
  748. This will probably break binary only modules.
  749. This feature is only enabled for gcc-3.0 and later - earlier compilers
  750. generate incorrect output with certain kernel constructs when
  751. -mregparm=3 is used.
  752. config SECCOMP
  753. bool "Enable seccomp to safely compute untrusted bytecode"
  754. depends on PROC_FS
  755. default y
  756. help
  757. This kernel feature is useful for number crunching applications
  758. that may need to compute untrusted bytecode during their
  759. execution. By using pipes or other transports made available to
  760. the process as file descriptors supporting the read/write
  761. syscalls, it's possible to isolate those applications in
  762. their own address space using seccomp. Once seccomp is
  763. enabled via /proc/<pid>/seccomp, it cannot be disabled
  764. and the task is only allowed to execute a few safe syscalls
  765. defined by each seccomp mode.
  766. If unsure, say Y. Only embedded should say N here.
  767. endmenu
  768. menu "Power management options (ACPI, APM)"
  769. depends on !X86_VOYAGER
  770. source kernel/power/Kconfig
  771. source "drivers/acpi/Kconfig"
  772. menu "APM (Advanced Power Management) BIOS Support"
  773. depends on PM && !X86_VISWS
  774. config APM
  775. tristate "APM (Advanced Power Management) BIOS support"
  776. depends on PM
  777. ---help---
  778. APM is a BIOS specification for saving power using several different
  779. techniques. This is mostly useful for battery powered laptops with
  780. APM compliant BIOSes. If you say Y here, the system time will be
  781. reset after a RESUME operation, the /proc/apm device will provide
  782. battery status information, and user-space programs will receive
  783. notification of APM "events" (e.g. battery status change).
  784. If you select "Y" here, you can disable actual use of the APM
  785. BIOS by passing the "apm=off" option to the kernel at boot time.
  786. Note that the APM support is almost completely disabled for
  787. machines with more than one CPU.
  788. In order to use APM, you will need supporting software. For location
  789. and more information, read <file:Documentation/pm.txt> and the
  790. Battery Powered Linux mini-HOWTO, available from
  791. <http://www.tldp.org/docs.html#howto>.
  792. This driver does not spin down disk drives (see the hdparm(8)
  793. manpage ("man 8 hdparm") for that), and it doesn't turn off
  794. VESA-compliant "green" monitors.
  795. This driver does not support the TI 4000M TravelMate and the ACER
  796. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  797. desktop machines also don't have compliant BIOSes, and this driver
  798. may cause those machines to panic during the boot phase.
  799. Generally, if you don't have a battery in your machine, there isn't
  800. much point in using this driver and you should say N. If you get
  801. random kernel OOPSes or reboots that don't seem to be related to
  802. anything, try disabling/enabling this option (or disabling/enabling
  803. APM in your BIOS).
  804. Some other things you should try when experiencing seemingly random,
  805. "weird" problems:
  806. 1) make sure that you have enough swap space and that it is
  807. enabled.
  808. 2) pass the "no-hlt" option to the kernel
  809. 3) switch on floating point emulation in the kernel and pass
  810. the "no387" option to the kernel
  811. 4) pass the "floppy=nodma" option to the kernel
  812. 5) pass the "mem=4M" option to the kernel (thereby disabling
  813. all but the first 4 MB of RAM)
  814. 6) make sure that the CPU is not over clocked.
  815. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  816. 8) disable the cache from your BIOS settings
  817. 9) install a fan for the video card or exchange video RAM
  818. 10) install a better fan for the CPU
  819. 11) exchange RAM chips
  820. 12) exchange the motherboard.
  821. To compile this driver as a module, choose M here: the
  822. module will be called apm.
  823. config APM_IGNORE_USER_SUSPEND
  824. bool "Ignore USER SUSPEND"
  825. depends on APM
  826. help
  827. This option will ignore USER SUSPEND requests. On machines with a
  828. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  829. series notebooks, it is necessary to say Y because of a BIOS bug.
  830. config APM_DO_ENABLE
  831. bool "Enable PM at boot time"
  832. depends on APM
  833. ---help---
  834. Enable APM features at boot time. From page 36 of the APM BIOS
  835. specification: "When disabled, the APM BIOS does not automatically
  836. power manage devices, enter the Standby State, enter the Suspend
  837. State, or take power saving steps in response to CPU Idle calls."
  838. This driver will make CPU Idle calls when Linux is idle (unless this
  839. feature is turned off -- see "Do CPU IDLE calls", below). This
  840. should always save battery power, but more complicated APM features
  841. will be dependent on your BIOS implementation. You may need to turn
  842. this option off if your computer hangs at boot time when using APM
  843. support, or if it beeps continuously instead of suspending. Turn
  844. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  845. T400CDT. This is off by default since most machines do fine without
  846. this feature.
  847. config APM_CPU_IDLE
  848. bool "Make CPU Idle calls when idle"
  849. depends on APM
  850. help
  851. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  852. On some machines, this can activate improved power savings, such as
  853. a slowed CPU clock rate, when the machine is idle. These idle calls
  854. are made after the idle loop has run for some length of time (e.g.,
  855. 333 mS). On some machines, this will cause a hang at boot time or
  856. whenever the CPU becomes idle. (On machines with more than one CPU,
  857. this option does nothing.)
  858. config APM_DISPLAY_BLANK
  859. bool "Enable console blanking using APM"
  860. depends on APM
  861. help
  862. Enable console blanking using the APM. Some laptops can use this to
  863. turn off the LCD backlight when the screen blanker of the Linux
  864. virtual console blanks the screen. Note that this is only used by
  865. the virtual console screen blanker, and won't turn off the backlight
  866. when using the X Window system. This also doesn't have anything to
  867. do with your VESA-compliant power-saving monitor. Further, this
  868. option doesn't work for all laptops -- it might not turn off your
  869. backlight at all, or it might print a lot of errors to the console,
  870. especially if you are using gpm.
  871. config APM_RTC_IS_GMT
  872. bool "RTC stores time in GMT"
  873. depends on APM
  874. help
  875. Say Y here if your RTC (Real Time Clock a.k.a. hardware clock)
  876. stores the time in GMT (Greenwich Mean Time). Say N if your RTC
  877. stores localtime.
  878. It is in fact recommended to store GMT in your RTC, because then you
  879. don't have to worry about daylight savings time changes. The only
  880. reason not to use GMT in your RTC is if you also run a broken OS
  881. that doesn't understand GMT.
  882. config APM_ALLOW_INTS
  883. bool "Allow interrupts during APM BIOS calls"
  884. depends on APM
  885. help
  886. Normally we disable external interrupts while we are making calls to
  887. the APM BIOS as a measure to lessen the effects of a badly behaving
  888. BIOS implementation. The BIOS should reenable interrupts if it
  889. needs to. Unfortunately, some BIOSes do not -- especially those in
  890. many of the newer IBM Thinkpads. If you experience hangs when you
  891. suspend, try setting this to Y. Otherwise, say N.
  892. config APM_REAL_MODE_POWER_OFF
  893. bool "Use real mode APM BIOS call to power off"
  894. depends on APM
  895. help
  896. Use real mode APM BIOS calls to switch off the computer. This is
  897. a work-around for a number of buggy BIOSes. Switch this option on if
  898. your computer crashes instead of powering off properly.
  899. endmenu
  900. source "arch/i386/kernel/cpu/cpufreq/Kconfig"
  901. endmenu
  902. menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
  903. config PCI
  904. bool "PCI support" if !X86_VISWS
  905. depends on !X86_VOYAGER
  906. default y if X86_VISWS
  907. help
  908. Find out whether you have a PCI motherboard. PCI is the name of a
  909. bus system, i.e. the way the CPU talks to the other stuff inside
  910. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  911. VESA. If you have PCI, say Y, otherwise N.
  912. The PCI-HOWTO, available from
  913. <http://www.tldp.org/docs.html#howto>, contains valuable
  914. information about which PCI hardware does work under Linux and which
  915. doesn't.
  916. choice
  917. prompt "PCI access mode"
  918. depends on PCI && !X86_VISWS
  919. default PCI_GOANY
  920. ---help---
  921. On PCI systems, the BIOS can be used to detect the PCI devices and
  922. determine their configuration. However, some old PCI motherboards
  923. have BIOS bugs and may crash if this is done. Also, some embedded
  924. PCI-based systems don't have any BIOS at all. Linux can also try to
  925. detect the PCI hardware directly without using the BIOS.
  926. With this option, you can specify how Linux should detect the
  927. PCI devices. If you choose "BIOS", the BIOS will be used,
  928. if you choose "Direct", the BIOS won't be used, and if you
  929. choose "MMConfig", then PCI Express MMCONFIG will be used.
  930. If you choose "Any", the kernel will try MMCONFIG, then the
  931. direct access method and falls back to the BIOS if that doesn't
  932. work. If unsure, go with the default, which is "Any".
  933. config PCI_GOBIOS
  934. bool "BIOS"
  935. config PCI_GOMMCONFIG
  936. bool "MMConfig"
  937. config PCI_GODIRECT
  938. bool "Direct"
  939. config PCI_GOANY
  940. bool "Any"
  941. endchoice
  942. config PCI_BIOS
  943. bool
  944. depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
  945. default y
  946. config PCI_DIRECT
  947. bool
  948. depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
  949. default y
  950. config PCI_MMCONFIG
  951. bool
  952. depends on PCI && (PCI_GOMMCONFIG || (PCI_GOANY && ACPI))
  953. select ACPI_BOOT
  954. default y
  955. source "drivers/pci/pcie/Kconfig"
  956. source "drivers/pci/Kconfig"
  957. config ISA
  958. bool "ISA support"
  959. depends on !(X86_VOYAGER || X86_VISWS)
  960. help
  961. Find out whether you have ISA slots on your motherboard. ISA is the
  962. name of a bus system, i.e. the way the CPU talks to the other stuff
  963. inside your box. Other bus systems are PCI, EISA, MicroChannel
  964. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  965. newer boards don't support it. If you have ISA, say Y, otherwise N.
  966. config EISA
  967. bool "EISA support"
  968. depends on ISA
  969. ---help---
  970. The Extended Industry Standard Architecture (EISA) bus was
  971. developed as an open alternative to the IBM MicroChannel bus.
  972. The EISA bus provided some of the features of the IBM MicroChannel
  973. bus while maintaining backward compatibility with cards made for
  974. the older ISA bus. The EISA bus saw limited use between 1988 and
  975. 1995 when it was made obsolete by the PCI bus.
  976. Say Y here if you are building a kernel for an EISA-based machine.
  977. Otherwise, say N.
  978. source "drivers/eisa/Kconfig"
  979. config MCA
  980. bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
  981. default y if X86_VOYAGER
  982. help
  983. MicroChannel Architecture is found in some IBM PS/2 machines and
  984. laptops. It is a bus system similar to PCI or ISA. See
  985. <file:Documentation/mca.txt> (and especially the web page given
  986. there) before attempting to build an MCA bus kernel.
  987. source "drivers/mca/Kconfig"
  988. config SCx200
  989. tristate "NatSemi SCx200 support"
  990. depends on !X86_VOYAGER
  991. help
  992. This provides basic support for the National Semiconductor SCx200
  993. processor. Right now this is just a driver for the GPIO pins.
  994. If you don't know what to do here, say N.
  995. This support is also available as a module. If compiled as a
  996. module, it will be called scx200.
  997. source "drivers/pcmcia/Kconfig"
  998. source "drivers/pci/hotplug/Kconfig"
  999. endmenu
  1000. menu "Executable file formats"
  1001. source "fs/Kconfig.binfmt"
  1002. endmenu
  1003. source "drivers/Kconfig"
  1004. source "fs/Kconfig"
  1005. source "arch/i386/oprofile/Kconfig"
  1006. source "arch/i386/Kconfig.debug"
  1007. source "security/Kconfig"
  1008. source "crypto/Kconfig"
  1009. source "lib/Kconfig"
  1010. #
  1011. # Use the generic interrupt handling code in kernel/irq/:
  1012. #
  1013. config GENERIC_HARDIRQS
  1014. bool
  1015. default y
  1016. config GENERIC_IRQ_PROBE
  1017. bool
  1018. default y
  1019. config X86_SMP
  1020. bool
  1021. depends on SMP && !X86_VOYAGER
  1022. default y
  1023. config X86_HT
  1024. bool
  1025. depends on SMP && !(X86_VISWS || X86_VOYAGER)
  1026. default y
  1027. config X86_BIOS_REBOOT
  1028. bool
  1029. depends on !(X86_VISWS || X86_VOYAGER)
  1030. default y
  1031. config X86_TRAMPOLINE
  1032. bool
  1033. depends on X86_SMP || (X86_VOYAGER && SMP)
  1034. default y
  1035. config PC
  1036. bool
  1037. depends on X86 && !EMBEDDED
  1038. default y