Kconfig 58 KB

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  1. # x86 configuration
  2. mainmenu "Linux Kernel Configuration for x86"
  3. # Select 32 or 64 bit
  4. config 64BIT
  5. bool "64-bit kernel" if ARCH = "x86"
  6. default ARCH = "x86_64"
  7. help
  8. Say yes to build a 64-bit kernel - formerly known as x86_64
  9. Say no to build a 32-bit kernel - formerly known as i386
  10. config X86_32
  11. def_bool !64BIT
  12. config X86_64
  13. def_bool 64BIT
  14. ### Arch settings
  15. config X86
  16. def_bool y
  17. select HAVE_UNSTABLE_SCHED_CLOCK
  18. select HAVE_IDE
  19. select HAVE_OPROFILE
  20. select HAVE_IOREMAP_PROT
  21. select HAVE_GET_USER_PAGES_FAST
  22. select HAVE_KPROBES
  23. select ARCH_WANT_OPTIONAL_GPIOLIB
  24. select HAVE_KRETPROBES
  25. select HAVE_DYNAMIC_FTRACE
  26. select HAVE_FTRACE
  27. select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
  28. select HAVE_ARCH_KGDB if !X86_VOYAGER
  29. select HAVE_GENERIC_DMA_COHERENT if X86_32
  30. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  31. config ARCH_DEFCONFIG
  32. string
  33. default "arch/x86/configs/i386_defconfig" if X86_32
  34. default "arch/x86/configs/x86_64_defconfig" if X86_64
  35. config GENERIC_LOCKBREAK
  36. def_bool n
  37. config GENERIC_TIME
  38. def_bool y
  39. config GENERIC_CMOS_UPDATE
  40. def_bool y
  41. config CLOCKSOURCE_WATCHDOG
  42. def_bool y
  43. config GENERIC_CLOCKEVENTS
  44. def_bool y
  45. config GENERIC_CLOCKEVENTS_BROADCAST
  46. def_bool y
  47. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  48. config LOCKDEP_SUPPORT
  49. def_bool y
  50. config STACKTRACE_SUPPORT
  51. def_bool y
  52. config HAVE_LATENCYTOP_SUPPORT
  53. def_bool y
  54. config FAST_CMPXCHG_LOCAL
  55. bool
  56. default y
  57. config MMU
  58. def_bool y
  59. config ZONE_DMA
  60. def_bool y
  61. config SBUS
  62. bool
  63. config GENERIC_ISA_DMA
  64. def_bool y
  65. config GENERIC_IOMAP
  66. def_bool y
  67. config GENERIC_BUG
  68. def_bool y
  69. depends on BUG
  70. config GENERIC_HWEIGHT
  71. def_bool y
  72. config GENERIC_GPIO
  73. def_bool n
  74. config ARCH_MAY_HAVE_PC_FDC
  75. def_bool y
  76. config RWSEM_GENERIC_SPINLOCK
  77. def_bool !X86_XADD
  78. config RWSEM_XCHGADD_ALGORITHM
  79. def_bool X86_XADD
  80. config ARCH_HAS_ILOG2_U32
  81. def_bool n
  82. config ARCH_HAS_ILOG2_U64
  83. def_bool n
  84. config ARCH_HAS_CPU_IDLE_WAIT
  85. def_bool y
  86. config GENERIC_CALIBRATE_DELAY
  87. def_bool y
  88. config GENERIC_TIME_VSYSCALL
  89. bool
  90. default X86_64
  91. config ARCH_HAS_CPU_RELAX
  92. def_bool y
  93. config ARCH_HAS_CACHE_LINE_SIZE
  94. def_bool y
  95. config HAVE_SETUP_PER_CPU_AREA
  96. def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
  97. config HAVE_CPUMASK_OF_CPU_MAP
  98. def_bool X86_64_SMP
  99. config ARCH_HIBERNATION_POSSIBLE
  100. def_bool y
  101. depends on !SMP || !X86_VOYAGER
  102. config ARCH_SUSPEND_POSSIBLE
  103. def_bool y
  104. depends on !X86_VOYAGER
  105. config ZONE_DMA32
  106. bool
  107. default X86_64
  108. config ARCH_POPULATES_NODE_MAP
  109. def_bool y
  110. config AUDIT_ARCH
  111. bool
  112. default X86_64
  113. config ARCH_SUPPORTS_AOUT
  114. def_bool y
  115. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  116. def_bool y
  117. # Use the generic interrupt handling code in kernel/irq/:
  118. config GENERIC_HARDIRQS
  119. bool
  120. default y
  121. config GENERIC_IRQ_PROBE
  122. bool
  123. default y
  124. config GENERIC_PENDING_IRQ
  125. bool
  126. depends on GENERIC_HARDIRQS && SMP
  127. default y
  128. config X86_SMP
  129. bool
  130. depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
  131. select USE_GENERIC_SMP_HELPERS
  132. default y
  133. config X86_32_SMP
  134. def_bool y
  135. depends on X86_32 && SMP
  136. config X86_64_SMP
  137. def_bool y
  138. depends on X86_64 && SMP
  139. config X86_HT
  140. bool
  141. depends on SMP
  142. depends on (X86_32 && !X86_VOYAGER) || X86_64
  143. default y
  144. config X86_BIOS_REBOOT
  145. bool
  146. depends on !X86_VOYAGER
  147. default y
  148. config X86_TRAMPOLINE
  149. bool
  150. depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
  151. default y
  152. config KTIME_SCALAR
  153. def_bool X86_32
  154. source "init/Kconfig"
  155. menu "Processor type and features"
  156. source "kernel/time/Kconfig"
  157. config SMP
  158. bool "Symmetric multi-processing support"
  159. ---help---
  160. This enables support for systems with more than one CPU. If you have
  161. a system with only one CPU, like most personal computers, say N. If
  162. you have a system with more than one CPU, say Y.
  163. If you say N here, the kernel will run on single and multiprocessor
  164. machines, but will use only one CPU of a multiprocessor machine. If
  165. you say Y here, the kernel will run on many, but not all,
  166. singleprocessor machines. On a singleprocessor machine, the kernel
  167. will run faster if you say N here.
  168. Note that if you say Y here and choose architecture "586" or
  169. "Pentium" under "Processor family", the kernel will not work on 486
  170. architectures. Similarly, multiprocessor kernels for the "PPro"
  171. architecture may not work on all Pentium based boards.
  172. People using multiprocessor machines who say Y here should also say
  173. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  174. Management" code will be disabled if you say Y here.
  175. See also <file:Documentation/i386/IO-APIC.txt>,
  176. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  177. <http://www.tldp.org/docs.html#howto>.
  178. If you don't know what to do here, say N.
  179. config X86_FIND_SMP_CONFIG
  180. def_bool y
  181. depends on X86_MPPARSE || X86_VOYAGER
  182. if ACPI
  183. config X86_MPPARSE
  184. def_bool y
  185. bool "Enable MPS table"
  186. depends on X86_LOCAL_APIC
  187. help
  188. For old smp systems that do not have proper acpi support. Newer systems
  189. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  190. endif
  191. if !ACPI
  192. config X86_MPPARSE
  193. def_bool y
  194. depends on X86_LOCAL_APIC
  195. endif
  196. choice
  197. prompt "Subarchitecture Type"
  198. default X86_PC
  199. config X86_PC
  200. bool "PC-compatible"
  201. help
  202. Choose this option if your computer is a standard PC or compatible.
  203. config X86_ELAN
  204. bool "AMD Elan"
  205. depends on X86_32
  206. help
  207. Select this for an AMD Elan processor.
  208. Do not use this option for K6/Athlon/Opteron processors!
  209. If unsure, choose "PC-compatible" instead.
  210. config X86_VOYAGER
  211. bool "Voyager (NCR)"
  212. depends on X86_32 && (SMP || BROKEN) && !PCI
  213. help
  214. Voyager is an MCA-based 32-way capable SMP architecture proprietary
  215. to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
  216. *** WARNING ***
  217. If you do not specifically know you have a Voyager based machine,
  218. say N here, otherwise the kernel you build will not be bootable.
  219. config X86_GENERICARCH
  220. bool "Generic architecture"
  221. depends on X86_32
  222. help
  223. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  224. subarchitectures. It is intended for a generic binary kernel.
  225. if you select them all, kernel will probe it one by one. and will
  226. fallback to default.
  227. if X86_GENERICARCH
  228. config X86_NUMAQ
  229. bool "NUMAQ (IBM/Sequent)"
  230. depends on SMP && X86_32 && PCI && X86_MPPARSE
  231. select NUMA
  232. help
  233. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  234. NUMA multiquad box. This changes the way that processors are
  235. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  236. of Flat Logical. You will need a new lynxer.elf file to flash your
  237. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  238. config X86_SUMMIT
  239. bool "Summit/EXA (IBM x440)"
  240. depends on X86_32 && SMP
  241. help
  242. This option is needed for IBM systems that use the Summit/EXA chipset.
  243. In particular, it is needed for the x440.
  244. config X86_ES7000
  245. bool "Support for Unisys ES7000 IA32 series"
  246. depends on X86_32 && SMP
  247. help
  248. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  249. supposed to run on an IA32-based Unisys ES7000 system.
  250. config X86_BIGSMP
  251. bool "Support for big SMP systems with more than 8 CPUs"
  252. depends on X86_32 && SMP
  253. help
  254. This option is needed for the systems that have more than 8 CPUs
  255. and if the system is not of any sub-arch type above.
  256. endif
  257. config X86_VSMP
  258. bool "Support for ScaleMP vSMP"
  259. select PARAVIRT
  260. depends on X86_64 && PCI
  261. help
  262. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  263. supposed to run on these EM64T-based machines. Only choose this option
  264. if you have one of these machines.
  265. endchoice
  266. config X86_VISWS
  267. bool "SGI 320/540 (Visual Workstation)"
  268. depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
  269. help
  270. The SGI Visual Workstation series is an IA32-based workstation
  271. based on SGI systems chips with some legacy PC hardware attached.
  272. Say Y here to create a kernel to run on the SGI 320 or 540.
  273. A kernel compiled for the Visual Workstation will run on general
  274. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  275. config X86_RDC321X
  276. bool "RDC R-321x SoC"
  277. depends on X86_32
  278. select M486
  279. select X86_REBOOTFIXUPS
  280. help
  281. This option is needed for RDC R-321x system-on-chip, also known
  282. as R-8610-(G).
  283. If you don't have one of these chips, you should say N here.
  284. config SCHED_NO_NO_OMIT_FRAME_POINTER
  285. def_bool y
  286. prompt "Single-depth WCHAN output"
  287. depends on X86_32
  288. help
  289. Calculate simpler /proc/<PID>/wchan values. If this option
  290. is disabled then wchan values will recurse back to the
  291. caller function. This provides more accurate wchan values,
  292. at the expense of slightly more scheduling overhead.
  293. If in doubt, say "Y".
  294. menuconfig PARAVIRT_GUEST
  295. bool "Paravirtualized guest support"
  296. help
  297. Say Y here to get to see options related to running Linux under
  298. various hypervisors. This option alone does not add any kernel code.
  299. If you say N, all options in this submenu will be skipped and disabled.
  300. if PARAVIRT_GUEST
  301. source "arch/x86/xen/Kconfig"
  302. config VMI
  303. bool "VMI Guest support"
  304. select PARAVIRT
  305. depends on X86_32
  306. depends on !X86_VOYAGER
  307. help
  308. VMI provides a paravirtualized interface to the VMware ESX server
  309. (it could be used by other hypervisors in theory too, but is not
  310. at the moment), by linking the kernel to a GPL-ed ROM module
  311. provided by the hypervisor.
  312. config KVM_CLOCK
  313. bool "KVM paravirtualized clock"
  314. select PARAVIRT
  315. select PARAVIRT_CLOCK
  316. depends on !X86_VOYAGER
  317. help
  318. Turning on this option will allow you to run a paravirtualized clock
  319. when running over the KVM hypervisor. Instead of relying on a PIT
  320. (or probably other) emulation by the underlying device model, the host
  321. provides the guest with timing infrastructure such as time of day, and
  322. system time
  323. config KVM_GUEST
  324. bool "KVM Guest support"
  325. select PARAVIRT
  326. depends on !X86_VOYAGER
  327. help
  328. This option enables various optimizations for running under the KVM
  329. hypervisor.
  330. source "arch/x86/lguest/Kconfig"
  331. config PARAVIRT
  332. bool "Enable paravirtualization code"
  333. depends on !X86_VOYAGER
  334. help
  335. This changes the kernel so it can modify itself when it is run
  336. under a hypervisor, potentially improving performance significantly
  337. over full virtualization. However, when run without a hypervisor
  338. the kernel is theoretically slower and slightly larger.
  339. config PARAVIRT_CLOCK
  340. bool
  341. default n
  342. endif
  343. config PARAVIRT_DEBUG
  344. bool "paravirt-ops debugging"
  345. depends on PARAVIRT && DEBUG_KERNEL
  346. help
  347. Enable to debug paravirt_ops internals. Specifically, BUG if
  348. a paravirt_op is missing when it is called.
  349. config MEMTEST
  350. bool "Memtest"
  351. help
  352. This option adds a kernel parameter 'memtest', which allows memtest
  353. to be set.
  354. memtest=0, mean disabled; -- default
  355. memtest=1, mean do 1 test pattern;
  356. ...
  357. memtest=4, mean do 4 test patterns.
  358. If you are unsure how to answer this question, answer N.
  359. config X86_SUMMIT_NUMA
  360. def_bool y
  361. depends on X86_32 && NUMA && X86_GENERICARCH
  362. config X86_CYCLONE_TIMER
  363. def_bool y
  364. depends on X86_GENERICARCH
  365. config ES7000_CLUSTERED_APIC
  366. def_bool y
  367. depends on SMP && X86_ES7000 && MPENTIUMIII
  368. source "arch/x86/Kconfig.cpu"
  369. config HPET_TIMER
  370. def_bool X86_64
  371. prompt "HPET Timer Support" if X86_32
  372. help
  373. Use the IA-PC HPET (High Precision Event Timer) to manage
  374. time in preference to the PIT and RTC, if a HPET is
  375. present.
  376. HPET is the next generation timer replacing legacy 8254s.
  377. The HPET provides a stable time base on SMP
  378. systems, unlike the TSC, but it is more expensive to access,
  379. as it is off-chip. You can find the HPET spec at
  380. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  381. You can safely choose Y here. However, HPET will only be
  382. activated if the platform and the BIOS support this feature.
  383. Otherwise the 8254 will be used for timing services.
  384. Choose N to continue using the legacy 8254 timer.
  385. config HPET_EMULATE_RTC
  386. def_bool y
  387. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  388. # Mark as embedded because too many people got it wrong.
  389. # The code disables itself when not needed.
  390. config DMI
  391. default y
  392. bool "Enable DMI scanning" if EMBEDDED
  393. help
  394. Enabled scanning of DMI to identify machine quirks. Say Y
  395. here unless you have verified that your setup is not
  396. affected by entries in the DMI blacklist. Required by PNP
  397. BIOS code.
  398. config GART_IOMMU
  399. bool "GART IOMMU support" if EMBEDDED
  400. default y
  401. select SWIOTLB
  402. select AGP
  403. depends on X86_64 && PCI
  404. help
  405. Support for full DMA access of devices with 32bit memory access only
  406. on systems with more than 3GB. This is usually needed for USB,
  407. sound, many IDE/SATA chipsets and some other devices.
  408. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  409. based hardware IOMMU and a software bounce buffer based IOMMU used
  410. on Intel systems and as fallback.
  411. The code is only active when needed (enough memory and limited
  412. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  413. too.
  414. config CALGARY_IOMMU
  415. bool "IBM Calgary IOMMU support"
  416. select SWIOTLB
  417. depends on X86_64 && PCI && EXPERIMENTAL
  418. help
  419. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  420. systems. Needed to run systems with more than 3GB of memory
  421. properly with 32-bit PCI devices that do not support DAC
  422. (Double Address Cycle). Calgary also supports bus level
  423. isolation, where all DMAs pass through the IOMMU. This
  424. prevents them from going anywhere except their intended
  425. destination. This catches hard-to-find kernel bugs and
  426. mis-behaving drivers and devices that do not use the DMA-API
  427. properly to set up their DMA buffers. The IOMMU can be
  428. turned off at boot time with the iommu=off parameter.
  429. Normally the kernel will make the right choice by itself.
  430. If unsure, say Y.
  431. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  432. def_bool y
  433. prompt "Should Calgary be enabled by default?"
  434. depends on CALGARY_IOMMU
  435. help
  436. Should Calgary be enabled by default? if you choose 'y', Calgary
  437. will be used (if it exists). If you choose 'n', Calgary will not be
  438. used even if it exists. If you choose 'n' and would like to use
  439. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  440. If unsure, say Y.
  441. config AMD_IOMMU
  442. bool "AMD IOMMU support"
  443. select SWIOTLB
  444. depends on X86_64 && PCI && ACPI
  445. help
  446. With this option you can enable support for AMD IOMMU hardware in
  447. your system. An IOMMU is a hardware component which provides
  448. remapping of DMA memory accesses from devices. With an AMD IOMMU you
  449. can isolate the the DMA memory of different devices and protect the
  450. system from misbehaving device drivers or hardware.
  451. You can find out if your system has an AMD IOMMU if you look into
  452. your BIOS for an option to enable it or if you have an IVRS ACPI
  453. table.
  454. # need this always selected by IOMMU for the VIA workaround
  455. config SWIOTLB
  456. bool
  457. help
  458. Support for software bounce buffers used on x86-64 systems
  459. which don't have a hardware IOMMU (e.g. the current generation
  460. of Intel's x86-64 CPUs). Using this PCI devices which can only
  461. access 32-bits of memory can be used on systems with more than
  462. 3 GB of memory. If unsure, say Y.
  463. config IOMMU_HELPER
  464. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  465. config MAXSMP
  466. bool "Configure Maximum number of SMP Processors and NUMA Nodes"
  467. depends on X86_64 && SMP
  468. default n
  469. help
  470. Configure maximum number of CPUS and NUMA Nodes for this architecture.
  471. If unsure, say N.
  472. if MAXSMP
  473. config NR_CPUS
  474. int
  475. default "4096"
  476. endif
  477. if !MAXSMP
  478. config NR_CPUS
  479. int "Maximum number of CPUs (2-4096)"
  480. range 2 4096
  481. depends on SMP
  482. default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
  483. default "8"
  484. help
  485. This allows you to specify the maximum number of CPUs which this
  486. kernel will support. The maximum supported value is 4096 and the
  487. minimum value which makes sense is 2.
  488. This is purely to save memory - each supported CPU adds
  489. approximately eight kilobytes to the kernel image.
  490. endif
  491. config SCHED_SMT
  492. bool "SMT (Hyperthreading) scheduler support"
  493. depends on X86_HT
  494. help
  495. SMT scheduler support improves the CPU scheduler's decision making
  496. when dealing with Intel Pentium 4 chips with HyperThreading at a
  497. cost of slightly increased overhead in some places. If unsure say
  498. N here.
  499. config SCHED_MC
  500. def_bool y
  501. prompt "Multi-core scheduler support"
  502. depends on X86_HT
  503. help
  504. Multi-core scheduler support improves the CPU scheduler's decision
  505. making when dealing with multi-core CPU chips at a cost of slightly
  506. increased overhead in some places. If unsure say N here.
  507. source "kernel/Kconfig.preempt"
  508. config X86_UP_APIC
  509. bool "Local APIC support on uniprocessors"
  510. depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
  511. help
  512. A local APIC (Advanced Programmable Interrupt Controller) is an
  513. integrated interrupt controller in the CPU. If you have a single-CPU
  514. system which has a processor with a local APIC, you can say Y here to
  515. enable and use it. If you say Y here even though your machine doesn't
  516. have a local APIC, then the kernel will still run with no slowdown at
  517. all. The local APIC supports CPU-generated self-interrupts (timer,
  518. performance counters), and the NMI watchdog which detects hard
  519. lockups.
  520. config X86_UP_IOAPIC
  521. bool "IO-APIC support on uniprocessors"
  522. depends on X86_UP_APIC
  523. help
  524. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  525. SMP-capable replacement for PC-style interrupt controllers. Most
  526. SMP systems and many recent uniprocessor systems have one.
  527. If you have a single-CPU system with an IO-APIC, you can say Y here
  528. to use it. If you say Y here even though your machine doesn't have
  529. an IO-APIC, then the kernel will still run with no slowdown at all.
  530. config X86_LOCAL_APIC
  531. def_bool y
  532. depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  533. config X86_IO_APIC
  534. def_bool y
  535. depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  536. config X86_VISWS_APIC
  537. def_bool y
  538. depends on X86_32 && X86_VISWS
  539. config X86_MCE
  540. bool "Machine Check Exception"
  541. depends on !X86_VOYAGER
  542. ---help---
  543. Machine Check Exception support allows the processor to notify the
  544. kernel if it detects a problem (e.g. overheating, component failure).
  545. The action the kernel takes depends on the severity of the problem,
  546. ranging from a warning message on the console, to halting the machine.
  547. Your processor must be a Pentium or newer to support this - check the
  548. flags in /proc/cpuinfo for mce. Note that some older Pentium systems
  549. have a design flaw which leads to false MCE events - hence MCE is
  550. disabled on all P5 processors, unless explicitly enabled with "mce"
  551. as a boot argument. Similarly, if MCE is built in and creates a
  552. problem on some new non-standard machine, you can boot with "nomce"
  553. to disable it. MCE support simply ignores non-MCE processors like
  554. the 386 and 486, so nearly everyone can say Y here.
  555. config X86_MCE_INTEL
  556. def_bool y
  557. prompt "Intel MCE features"
  558. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  559. help
  560. Additional support for intel specific MCE features such as
  561. the thermal monitor.
  562. config X86_MCE_AMD
  563. def_bool y
  564. prompt "AMD MCE features"
  565. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  566. help
  567. Additional support for AMD specific MCE features such as
  568. the DRAM Error Threshold.
  569. config X86_MCE_NONFATAL
  570. tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
  571. depends on X86_32 && X86_MCE
  572. help
  573. Enabling this feature starts a timer that triggers every 5 seconds which
  574. will look at the machine check registers to see if anything happened.
  575. Non-fatal problems automatically get corrected (but still logged).
  576. Disable this if you don't want to see these messages.
  577. Seeing the messages this option prints out may be indicative of dying
  578. or out-of-spec (ie, overclocked) hardware.
  579. This option only does something on certain CPUs.
  580. (AMD Athlon/Duron and Intel Pentium 4)
  581. config X86_MCE_P4THERMAL
  582. bool "check for P4 thermal throttling interrupt."
  583. depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
  584. help
  585. Enabling this feature will cause a message to be printed when the P4
  586. enters thermal throttling.
  587. config VM86
  588. bool "Enable VM86 support" if EMBEDDED
  589. default y
  590. depends on X86_32
  591. help
  592. This option is required by programs like DOSEMU to run 16-bit legacy
  593. code on X86 processors. It also may be needed by software like
  594. XFree86 to initialize some video cards via BIOS. Disabling this
  595. option saves about 6k.
  596. config TOSHIBA
  597. tristate "Toshiba Laptop support"
  598. depends on X86_32
  599. ---help---
  600. This adds a driver to safely access the System Management Mode of
  601. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  602. not work on models with a Phoenix BIOS. The System Management Mode
  603. is used to set the BIOS and power saving options on Toshiba portables.
  604. For information on utilities to make use of this driver see the
  605. Toshiba Linux utilities web site at:
  606. <http://www.buzzard.org.uk/toshiba/>.
  607. Say Y if you intend to run this kernel on a Toshiba portable.
  608. Say N otherwise.
  609. config I8K
  610. tristate "Dell laptop support"
  611. ---help---
  612. This adds a driver to safely access the System Management Mode
  613. of the CPU on the Dell Inspiron 8000. The System Management Mode
  614. is used to read cpu temperature and cooling fan status and to
  615. control the fans on the I8K portables.
  616. This driver has been tested only on the Inspiron 8000 but it may
  617. also work with other Dell laptops. You can force loading on other
  618. models by passing the parameter `force=1' to the module. Use at
  619. your own risk.
  620. For information on utilities to make use of this driver see the
  621. I8K Linux utilities web site at:
  622. <http://people.debian.org/~dz/i8k/>
  623. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  624. Say N otherwise.
  625. config X86_REBOOTFIXUPS
  626. def_bool n
  627. prompt "Enable X86 board specific fixups for reboot"
  628. depends on X86_32 && X86
  629. ---help---
  630. This enables chipset and/or board specific fixups to be done
  631. in order to get reboot to work correctly. This is only needed on
  632. some combinations of hardware and BIOS. The symptom, for which
  633. this config is intended, is when reboot ends with a stalled/hung
  634. system.
  635. Currently, the only fixup is for the Geode machines using
  636. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  637. Say Y if you want to enable the fixup. Currently, it's safe to
  638. enable this option even if you don't need it.
  639. Say N otherwise.
  640. config MICROCODE
  641. tristate "/dev/cpu/microcode - microcode support"
  642. select FW_LOADER
  643. ---help---
  644. If you say Y here, you will be able to update the microcode on
  645. certain Intel and AMD processors. The Intel support is for the
  646. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  647. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  648. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  649. You will obviously need the actual microcode binary data itself
  650. which is not shipped with the Linux kernel.
  651. This option selects the general module only, you need to select
  652. at least one vendor specific module as well.
  653. To compile this driver as a module, choose M here: the
  654. module will be called microcode.
  655. config MICROCODE_INTEL
  656. bool "Intel microcode patch loading support"
  657. depends on MICROCODE
  658. default MICROCODE
  659. select FW_LOADER
  660. --help---
  661. This options enables microcode patch loading support for Intel
  662. processors.
  663. For latest news and information on obtaining all the required
  664. Intel ingredients for this driver, check:
  665. <http://www.urbanmyth.org/microcode/>.
  666. config MICROCODE_AMD
  667. bool "AMD microcode patch loading support"
  668. depends on MICROCODE
  669. select FW_LOADER
  670. --help---
  671. If you select this option, microcode patch loading support for AMD
  672. processors will be enabled.
  673. config MICROCODE_OLD_INTERFACE
  674. def_bool y
  675. depends on MICROCODE
  676. config X86_MSR
  677. tristate "/dev/cpu/*/msr - Model-specific register support"
  678. help
  679. This device gives privileged processes access to the x86
  680. Model-Specific Registers (MSRs). It is a character device with
  681. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  682. MSR accesses are directed to a specific CPU on multi-processor
  683. systems.
  684. config X86_CPUID
  685. tristate "/dev/cpu/*/cpuid - CPU information support"
  686. help
  687. This device gives processes access to the x86 CPUID instruction to
  688. be executed on a specific processor. It is a character device
  689. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  690. /dev/cpu/31/cpuid.
  691. choice
  692. prompt "High Memory Support"
  693. default HIGHMEM4G if !X86_NUMAQ
  694. default HIGHMEM64G if X86_NUMAQ
  695. depends on X86_32
  696. config NOHIGHMEM
  697. bool "off"
  698. depends on !X86_NUMAQ
  699. ---help---
  700. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  701. However, the address space of 32-bit x86 processors is only 4
  702. Gigabytes large. That means that, if you have a large amount of
  703. physical memory, not all of it can be "permanently mapped" by the
  704. kernel. The physical memory that's not permanently mapped is called
  705. "high memory".
  706. If you are compiling a kernel which will never run on a machine with
  707. more than 1 Gigabyte total physical RAM, answer "off" here (default
  708. choice and suitable for most users). This will result in a "3GB/1GB"
  709. split: 3GB are mapped so that each process sees a 3GB virtual memory
  710. space and the remaining part of the 4GB virtual memory space is used
  711. by the kernel to permanently map as much physical memory as
  712. possible.
  713. If the machine has between 1 and 4 Gigabytes physical RAM, then
  714. answer "4GB" here.
  715. If more than 4 Gigabytes is used then answer "64GB" here. This
  716. selection turns Intel PAE (Physical Address Extension) mode on.
  717. PAE implements 3-level paging on IA32 processors. PAE is fully
  718. supported by Linux, PAE mode is implemented on all recent Intel
  719. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  720. then the kernel will not boot on CPUs that don't support PAE!
  721. The actual amount of total physical memory will either be
  722. auto detected or can be forced by using a kernel command line option
  723. such as "mem=256M". (Try "man bootparam" or see the documentation of
  724. your boot loader (lilo or loadlin) about how to pass options to the
  725. kernel at boot time.)
  726. If unsure, say "off".
  727. config HIGHMEM4G
  728. bool "4GB"
  729. depends on !X86_NUMAQ
  730. help
  731. Select this if you have a 32-bit processor and between 1 and 4
  732. gigabytes of physical RAM.
  733. config HIGHMEM64G
  734. bool "64GB"
  735. depends on !M386 && !M486
  736. select X86_PAE
  737. help
  738. Select this if you have a 32-bit processor and more than 4
  739. gigabytes of physical RAM.
  740. endchoice
  741. choice
  742. depends on EXPERIMENTAL
  743. prompt "Memory split" if EMBEDDED
  744. default VMSPLIT_3G
  745. depends on X86_32
  746. help
  747. Select the desired split between kernel and user memory.
  748. If the address range available to the kernel is less than the
  749. physical memory installed, the remaining memory will be available
  750. as "high memory". Accessing high memory is a little more costly
  751. than low memory, as it needs to be mapped into the kernel first.
  752. Note that increasing the kernel address space limits the range
  753. available to user programs, making the address space there
  754. tighter. Selecting anything other than the default 3G/1G split
  755. will also likely make your kernel incompatible with binary-only
  756. kernel modules.
  757. If you are not absolutely sure what you are doing, leave this
  758. option alone!
  759. config VMSPLIT_3G
  760. bool "3G/1G user/kernel split"
  761. config VMSPLIT_3G_OPT
  762. depends on !X86_PAE
  763. bool "3G/1G user/kernel split (for full 1G low memory)"
  764. config VMSPLIT_2G
  765. bool "2G/2G user/kernel split"
  766. config VMSPLIT_2G_OPT
  767. depends on !X86_PAE
  768. bool "2G/2G user/kernel split (for full 2G low memory)"
  769. config VMSPLIT_1G
  770. bool "1G/3G user/kernel split"
  771. endchoice
  772. config PAGE_OFFSET
  773. hex
  774. default 0xB0000000 if VMSPLIT_3G_OPT
  775. default 0x80000000 if VMSPLIT_2G
  776. default 0x78000000 if VMSPLIT_2G_OPT
  777. default 0x40000000 if VMSPLIT_1G
  778. default 0xC0000000
  779. depends on X86_32
  780. config HIGHMEM
  781. def_bool y
  782. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  783. config X86_PAE
  784. def_bool n
  785. prompt "PAE (Physical Address Extension) Support"
  786. depends on X86_32 && !HIGHMEM4G
  787. select RESOURCES_64BIT
  788. help
  789. PAE is required for NX support, and furthermore enables
  790. larger swapspace support for non-overcommit purposes. It
  791. has the cost of more pagetable lookup overhead, and also
  792. consumes more pagetable space per process.
  793. # Common NUMA Features
  794. config NUMA
  795. bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
  796. depends on SMP
  797. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  798. default n if X86_PC
  799. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  800. help
  801. Enable NUMA (Non Uniform Memory Access) support.
  802. The kernel will try to allocate memory used by a CPU on the
  803. local memory controller of the CPU and add some more
  804. NUMA awareness to the kernel.
  805. For i386 this is currently highly experimental and should be only
  806. used for kernel development. It might also cause boot failures.
  807. For x86_64 this is recommended on all multiprocessor Opteron systems.
  808. If the system is EM64T, you should say N unless your system is
  809. EM64T NUMA.
  810. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  811. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  812. config K8_NUMA
  813. def_bool y
  814. prompt "Old style AMD Opteron NUMA detection"
  815. depends on X86_64 && NUMA && PCI
  816. help
  817. Enable K8 NUMA node topology detection. You should say Y here if
  818. you have a multi processor AMD K8 system. This uses an old
  819. method to read the NUMA configuration directly from the builtin
  820. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  821. instead, which also takes priority if both are compiled in.
  822. config X86_64_ACPI_NUMA
  823. def_bool y
  824. prompt "ACPI NUMA detection"
  825. depends on X86_64 && NUMA && ACPI && PCI
  826. select ACPI_NUMA
  827. help
  828. Enable ACPI SRAT based node topology detection.
  829. # Some NUMA nodes have memory ranges that span
  830. # other nodes. Even though a pfn is valid and
  831. # between a node's start and end pfns, it may not
  832. # reside on that node. See memmap_init_zone()
  833. # for details.
  834. config NODES_SPAN_OTHER_NODES
  835. def_bool y
  836. depends on X86_64_ACPI_NUMA
  837. config NUMA_EMU
  838. bool "NUMA emulation"
  839. depends on X86_64 && NUMA
  840. help
  841. Enable NUMA emulation. A flat machine will be split
  842. into virtual nodes when booted with "numa=fake=N", where N is the
  843. number of nodes. This is only useful for debugging.
  844. if MAXSMP
  845. config NODES_SHIFT
  846. int
  847. default "9"
  848. endif
  849. if !MAXSMP
  850. config NODES_SHIFT
  851. int "Maximum NUMA Nodes (as a power of 2)"
  852. range 1 9 if X86_64
  853. default "6" if X86_64
  854. default "4" if X86_NUMAQ
  855. default "3"
  856. depends on NEED_MULTIPLE_NODES
  857. help
  858. Specify the maximum number of NUMA Nodes available on the target
  859. system. Increases memory reserved to accomodate various tables.
  860. endif
  861. config HAVE_ARCH_BOOTMEM_NODE
  862. def_bool y
  863. depends on X86_32 && NUMA
  864. config ARCH_HAVE_MEMORY_PRESENT
  865. def_bool y
  866. depends on X86_32 && DISCONTIGMEM
  867. config NEED_NODE_MEMMAP_SIZE
  868. def_bool y
  869. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  870. config HAVE_ARCH_ALLOC_REMAP
  871. def_bool y
  872. depends on X86_32 && NUMA
  873. config ARCH_FLATMEM_ENABLE
  874. def_bool y
  875. depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
  876. config ARCH_DISCONTIGMEM_ENABLE
  877. def_bool y
  878. depends on NUMA && X86_32
  879. config ARCH_DISCONTIGMEM_DEFAULT
  880. def_bool y
  881. depends on NUMA && X86_32
  882. config ARCH_SPARSEMEM_DEFAULT
  883. def_bool y
  884. depends on X86_64
  885. config ARCH_SPARSEMEM_ENABLE
  886. def_bool y
  887. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
  888. select SPARSEMEM_STATIC if X86_32
  889. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  890. config ARCH_SELECT_MEMORY_MODEL
  891. def_bool y
  892. depends on ARCH_SPARSEMEM_ENABLE
  893. config ARCH_MEMORY_PROBE
  894. def_bool X86_64
  895. depends on MEMORY_HOTPLUG
  896. source "mm/Kconfig"
  897. config HIGHPTE
  898. bool "Allocate 3rd-level pagetables from highmem"
  899. depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
  900. help
  901. The VM uses one page table entry for each page of physical memory.
  902. For systems with a lot of RAM, this can be wasteful of precious
  903. low memory. Setting this option will put user-space page table
  904. entries in high memory.
  905. config MATH_EMULATION
  906. bool
  907. prompt "Math emulation" if X86_32
  908. ---help---
  909. Linux can emulate a math coprocessor (used for floating point
  910. operations) if you don't have one. 486DX and Pentium processors have
  911. a math coprocessor built in, 486SX and 386 do not, unless you added
  912. a 487DX or 387, respectively. (The messages during boot time can
  913. give you some hints here ["man dmesg"].) Everyone needs either a
  914. coprocessor or this emulation.
  915. If you don't have a math coprocessor, you need to say Y here; if you
  916. say Y here even though you have a coprocessor, the coprocessor will
  917. be used nevertheless. (This behavior can be changed with the kernel
  918. command line option "no387", which comes handy if your coprocessor
  919. is broken. Try "man bootparam" or see the documentation of your boot
  920. loader (lilo or loadlin) about how to pass options to the kernel at
  921. boot time.) This means that it is a good idea to say Y here if you
  922. intend to use this kernel on different machines.
  923. More information about the internals of the Linux math coprocessor
  924. emulation can be found in <file:arch/x86/math-emu/README>.
  925. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  926. kernel, it won't hurt.
  927. config MTRR
  928. bool "MTRR (Memory Type Range Register) support"
  929. ---help---
  930. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  931. the Memory Type Range Registers (MTRRs) may be used to control
  932. processor access to memory ranges. This is most useful if you have
  933. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  934. allows bus write transfers to be combined into a larger transfer
  935. before bursting over the PCI/AGP bus. This can increase performance
  936. of image write operations 2.5 times or more. Saying Y here creates a
  937. /proc/mtrr file which may be used to manipulate your processor's
  938. MTRRs. Typically the X server should use this.
  939. This code has a reasonably generic interface so that similar
  940. control registers on other processors can be easily supported
  941. as well:
  942. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  943. Registers (ARRs) which provide a similar functionality to MTRRs. For
  944. these, the ARRs are used to emulate the MTRRs.
  945. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  946. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  947. write-combining. All of these processors are supported by this code
  948. and it makes sense to say Y here if you have one of them.
  949. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  950. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  951. can lead to all sorts of problems, so it's good to say Y here.
  952. You can safely say Y even if your machine doesn't have MTRRs, you'll
  953. just add about 9 KB to your kernel.
  954. See <file:Documentation/mtrr.txt> for more information.
  955. config MTRR_SANITIZER
  956. bool
  957. prompt "MTRR cleanup support"
  958. depends on MTRR
  959. help
  960. Convert MTRR layout from continuous to discrete, so X drivers can
  961. add writeback entries.
  962. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  963. The largest mtrr entry size for a continous block can be set with
  964. mtrr_chunk_size.
  965. If unsure, say N.
  966. config MTRR_SANITIZER_ENABLE_DEFAULT
  967. int "MTRR cleanup enable value (0-1)"
  968. range 0 1
  969. default "0"
  970. depends on MTRR_SANITIZER
  971. help
  972. Enable mtrr cleanup default value
  973. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  974. int "MTRR cleanup spare reg num (0-7)"
  975. range 0 7
  976. default "1"
  977. depends on MTRR_SANITIZER
  978. help
  979. mtrr cleanup spare entries default, it can be changed via
  980. mtrr_spare_reg_nr=N on the kernel command line.
  981. config X86_PAT
  982. bool
  983. prompt "x86 PAT support"
  984. depends on MTRR
  985. help
  986. Use PAT attributes to setup page level cache control.
  987. PATs are the modern equivalents of MTRRs and are much more
  988. flexible than MTRRs.
  989. Say N here if you see bootup problems (boot crash, boot hang,
  990. spontaneous reboots) or a non-working video driver.
  991. If unsure, say Y.
  992. config EFI
  993. def_bool n
  994. prompt "EFI runtime service support"
  995. depends on ACPI
  996. ---help---
  997. This enables the kernel to use EFI runtime services that are
  998. available (such as the EFI variable services).
  999. This option is only useful on systems that have EFI firmware.
  1000. In addition, you should use the latest ELILO loader available
  1001. at <http://elilo.sourceforge.net> in order to take advantage
  1002. of EFI runtime services. However, even with this option, the
  1003. resultant kernel should continue to boot on existing non-EFI
  1004. platforms.
  1005. config IRQBALANCE
  1006. def_bool y
  1007. prompt "Enable kernel irq balancing"
  1008. depends on X86_32 && SMP && X86_IO_APIC
  1009. help
  1010. The default yes will allow the kernel to do irq load balancing.
  1011. Saying no will keep the kernel from doing irq load balancing.
  1012. config SECCOMP
  1013. def_bool y
  1014. prompt "Enable seccomp to safely compute untrusted bytecode"
  1015. depends on PROC_FS
  1016. help
  1017. This kernel feature is useful for number crunching applications
  1018. that may need to compute untrusted bytecode during their
  1019. execution. By using pipes or other transports made available to
  1020. the process as file descriptors supporting the read/write
  1021. syscalls, it's possible to isolate those applications in
  1022. their own address space using seccomp. Once seccomp is
  1023. enabled via /proc/<pid>/seccomp, it cannot be disabled
  1024. and the task is only allowed to execute a few safe syscalls
  1025. defined by each seccomp mode.
  1026. If unsure, say Y. Only embedded should say N here.
  1027. config CC_STACKPROTECTOR
  1028. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1029. depends on X86_64 && EXPERIMENTAL && BROKEN
  1030. help
  1031. This option turns on the -fstack-protector GCC feature. This
  1032. feature puts, at the beginning of critical functions, a canary
  1033. value on the stack just before the return address, and validates
  1034. the value just before actually returning. Stack based buffer
  1035. overflows (that need to overwrite this return address) now also
  1036. overwrite the canary, which gets detected and the attack is then
  1037. neutralized via a kernel panic.
  1038. This feature requires gcc version 4.2 or above, or a distribution
  1039. gcc with the feature backported. Older versions are automatically
  1040. detected and for those versions, this configuration option is ignored.
  1041. config CC_STACKPROTECTOR_ALL
  1042. bool "Use stack-protector for all functions"
  1043. depends on CC_STACKPROTECTOR
  1044. help
  1045. Normally, GCC only inserts the canary value protection for
  1046. functions that use large-ish on-stack buffers. By enabling
  1047. this option, GCC will be asked to do this for ALL functions.
  1048. source kernel/Kconfig.hz
  1049. config KEXEC
  1050. bool "kexec system call"
  1051. depends on X86_BIOS_REBOOT
  1052. help
  1053. kexec is a system call that implements the ability to shutdown your
  1054. current kernel, and to start another kernel. It is like a reboot
  1055. but it is independent of the system firmware. And like a reboot
  1056. you can start any kernel with it, not just Linux.
  1057. The name comes from the similarity to the exec system call.
  1058. It is an ongoing process to be certain the hardware in a machine
  1059. is properly shutdown, so do not be surprised if this code does not
  1060. initially work for you. It may help to enable device hotplugging
  1061. support. As of this writing the exact hardware interface is
  1062. strongly in flux, so no good recommendation can be made.
  1063. config CRASH_DUMP
  1064. bool "kernel crash dumps (EXPERIMENTAL)"
  1065. depends on X86_64 || (X86_32 && HIGHMEM)
  1066. help
  1067. Generate crash dump after being started by kexec.
  1068. This should be normally only set in special crash dump kernels
  1069. which are loaded in the main kernel with kexec-tools into
  1070. a specially reserved region and then later executed after
  1071. a crash by kdump/kexec. The crash dump kernel must be compiled
  1072. to a memory address not used by the main kernel or BIOS using
  1073. PHYSICAL_START, or it must be built as a relocatable image
  1074. (CONFIG_RELOCATABLE=y).
  1075. For more details see Documentation/kdump/kdump.txt
  1076. config KEXEC_JUMP
  1077. bool "kexec jump (EXPERIMENTAL)"
  1078. depends on EXPERIMENTAL
  1079. depends on KEXEC && HIBERNATION && X86_32
  1080. help
  1081. Jump between original kernel and kexeced kernel and invoke
  1082. code in physical address mode via KEXEC
  1083. config PHYSICAL_START
  1084. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  1085. default "0x1000000" if X86_NUMAQ
  1086. default "0x200000" if X86_64
  1087. default "0x100000"
  1088. help
  1089. This gives the physical address where the kernel is loaded.
  1090. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1091. bzImage will decompress itself to above physical address and
  1092. run from there. Otherwise, bzImage will run from the address where
  1093. it has been loaded by the boot loader and will ignore above physical
  1094. address.
  1095. In normal kdump cases one does not have to set/change this option
  1096. as now bzImage can be compiled as a completely relocatable image
  1097. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1098. address. This option is mainly useful for the folks who don't want
  1099. to use a bzImage for capturing the crash dump and want to use a
  1100. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1101. to be specifically compiled to run from a specific memory area
  1102. (normally a reserved region) and this option comes handy.
  1103. So if you are using bzImage for capturing the crash dump, leave
  1104. the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
  1105. Otherwise if you plan to use vmlinux for capturing the crash dump
  1106. change this value to start of the reserved region (Typically 16MB
  1107. 0x1000000). In other words, it can be set based on the "X" value as
  1108. specified in the "crashkernel=YM@XM" command line boot parameter
  1109. passed to the panic-ed kernel. Typically this parameter is set as
  1110. crashkernel=64M@16M. Please take a look at
  1111. Documentation/kdump/kdump.txt for more details about crash dumps.
  1112. Usage of bzImage for capturing the crash dump is recommended as
  1113. one does not have to build two kernels. Same kernel can be used
  1114. as production kernel and capture kernel. Above option should have
  1115. gone away after relocatable bzImage support is introduced. But it
  1116. is present because there are users out there who continue to use
  1117. vmlinux for dump capture. This option should go away down the
  1118. line.
  1119. Don't change this unless you know what you are doing.
  1120. config RELOCATABLE
  1121. bool "Build a relocatable kernel (EXPERIMENTAL)"
  1122. depends on EXPERIMENTAL
  1123. help
  1124. This builds a kernel image that retains relocation information
  1125. so it can be loaded someplace besides the default 1MB.
  1126. The relocations tend to make the kernel binary about 10% larger,
  1127. but are discarded at runtime.
  1128. One use is for the kexec on panic case where the recovery kernel
  1129. must live at a different physical address than the primary
  1130. kernel.
  1131. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1132. it has been loaded at and the compile time physical address
  1133. (CONFIG_PHYSICAL_START) is ignored.
  1134. config PHYSICAL_ALIGN
  1135. hex
  1136. prompt "Alignment value to which kernel should be aligned" if X86_32
  1137. default "0x100000" if X86_32
  1138. default "0x200000" if X86_64
  1139. range 0x2000 0x400000
  1140. help
  1141. This value puts the alignment restrictions on physical address
  1142. where kernel is loaded and run from. Kernel is compiled for an
  1143. address which meets above alignment restriction.
  1144. If bootloader loads the kernel at a non-aligned address and
  1145. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1146. address aligned to above value and run from there.
  1147. If bootloader loads the kernel at a non-aligned address and
  1148. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1149. load address and decompress itself to the address it has been
  1150. compiled for and run from there. The address for which kernel is
  1151. compiled already meets above alignment restrictions. Hence the
  1152. end result is that kernel runs from a physical address meeting
  1153. above alignment restrictions.
  1154. Don't change this unless you know what you are doing.
  1155. config HOTPLUG_CPU
  1156. bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
  1157. depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
  1158. ---help---
  1159. Say Y here to experiment with turning CPUs off and on, and to
  1160. enable suspend on SMP systems. CPUs can be controlled through
  1161. /sys/devices/system/cpu.
  1162. Say N if you want to disable CPU hotplug and don't need to
  1163. suspend.
  1164. config COMPAT_VDSO
  1165. def_bool y
  1166. prompt "Compat VDSO support"
  1167. depends on X86_32 || IA32_EMULATION
  1168. help
  1169. Map the 32-bit VDSO to the predictable old-style address too.
  1170. ---help---
  1171. Say N here if you are running a sufficiently recent glibc
  1172. version (2.3.3 or later), to remove the high-mapped
  1173. VDSO mapping and to exclusively use the randomized VDSO.
  1174. If unsure, say Y.
  1175. endmenu
  1176. config ARCH_ENABLE_MEMORY_HOTPLUG
  1177. def_bool y
  1178. depends on X86_64 || (X86_32 && HIGHMEM)
  1179. config HAVE_ARCH_EARLY_PFN_TO_NID
  1180. def_bool X86_64
  1181. depends on NUMA
  1182. menu "Power management options"
  1183. depends on !X86_VOYAGER
  1184. config ARCH_HIBERNATION_HEADER
  1185. def_bool y
  1186. depends on X86_64 && HIBERNATION
  1187. source "kernel/power/Kconfig"
  1188. source "drivers/acpi/Kconfig"
  1189. config X86_APM_BOOT
  1190. bool
  1191. default y
  1192. depends on APM || APM_MODULE
  1193. menuconfig APM
  1194. tristate "APM (Advanced Power Management) BIOS support"
  1195. depends on X86_32 && PM_SLEEP
  1196. ---help---
  1197. APM is a BIOS specification for saving power using several different
  1198. techniques. This is mostly useful for battery powered laptops with
  1199. APM compliant BIOSes. If you say Y here, the system time will be
  1200. reset after a RESUME operation, the /proc/apm device will provide
  1201. battery status information, and user-space programs will receive
  1202. notification of APM "events" (e.g. battery status change).
  1203. If you select "Y" here, you can disable actual use of the APM
  1204. BIOS by passing the "apm=off" option to the kernel at boot time.
  1205. Note that the APM support is almost completely disabled for
  1206. machines with more than one CPU.
  1207. In order to use APM, you will need supporting software. For location
  1208. and more information, read <file:Documentation/power/pm.txt> and the
  1209. Battery Powered Linux mini-HOWTO, available from
  1210. <http://www.tldp.org/docs.html#howto>.
  1211. This driver does not spin down disk drives (see the hdparm(8)
  1212. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1213. VESA-compliant "green" monitors.
  1214. This driver does not support the TI 4000M TravelMate and the ACER
  1215. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1216. desktop machines also don't have compliant BIOSes, and this driver
  1217. may cause those machines to panic during the boot phase.
  1218. Generally, if you don't have a battery in your machine, there isn't
  1219. much point in using this driver and you should say N. If you get
  1220. random kernel OOPSes or reboots that don't seem to be related to
  1221. anything, try disabling/enabling this option (or disabling/enabling
  1222. APM in your BIOS).
  1223. Some other things you should try when experiencing seemingly random,
  1224. "weird" problems:
  1225. 1) make sure that you have enough swap space and that it is
  1226. enabled.
  1227. 2) pass the "no-hlt" option to the kernel
  1228. 3) switch on floating point emulation in the kernel and pass
  1229. the "no387" option to the kernel
  1230. 4) pass the "floppy=nodma" option to the kernel
  1231. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1232. all but the first 4 MB of RAM)
  1233. 6) make sure that the CPU is not over clocked.
  1234. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1235. 8) disable the cache from your BIOS settings
  1236. 9) install a fan for the video card or exchange video RAM
  1237. 10) install a better fan for the CPU
  1238. 11) exchange RAM chips
  1239. 12) exchange the motherboard.
  1240. To compile this driver as a module, choose M here: the
  1241. module will be called apm.
  1242. if APM
  1243. config APM_IGNORE_USER_SUSPEND
  1244. bool "Ignore USER SUSPEND"
  1245. help
  1246. This option will ignore USER SUSPEND requests. On machines with a
  1247. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1248. series notebooks, it is necessary to say Y because of a BIOS bug.
  1249. config APM_DO_ENABLE
  1250. bool "Enable PM at boot time"
  1251. ---help---
  1252. Enable APM features at boot time. From page 36 of the APM BIOS
  1253. specification: "When disabled, the APM BIOS does not automatically
  1254. power manage devices, enter the Standby State, enter the Suspend
  1255. State, or take power saving steps in response to CPU Idle calls."
  1256. This driver will make CPU Idle calls when Linux is idle (unless this
  1257. feature is turned off -- see "Do CPU IDLE calls", below). This
  1258. should always save battery power, but more complicated APM features
  1259. will be dependent on your BIOS implementation. You may need to turn
  1260. this option off if your computer hangs at boot time when using APM
  1261. support, or if it beeps continuously instead of suspending. Turn
  1262. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1263. T400CDT. This is off by default since most machines do fine without
  1264. this feature.
  1265. config APM_CPU_IDLE
  1266. bool "Make CPU Idle calls when idle"
  1267. help
  1268. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1269. On some machines, this can activate improved power savings, such as
  1270. a slowed CPU clock rate, when the machine is idle. These idle calls
  1271. are made after the idle loop has run for some length of time (e.g.,
  1272. 333 mS). On some machines, this will cause a hang at boot time or
  1273. whenever the CPU becomes idle. (On machines with more than one CPU,
  1274. this option does nothing.)
  1275. config APM_DISPLAY_BLANK
  1276. bool "Enable console blanking using APM"
  1277. help
  1278. Enable console blanking using the APM. Some laptops can use this to
  1279. turn off the LCD backlight when the screen blanker of the Linux
  1280. virtual console blanks the screen. Note that this is only used by
  1281. the virtual console screen blanker, and won't turn off the backlight
  1282. when using the X Window system. This also doesn't have anything to
  1283. do with your VESA-compliant power-saving monitor. Further, this
  1284. option doesn't work for all laptops -- it might not turn off your
  1285. backlight at all, or it might print a lot of errors to the console,
  1286. especially if you are using gpm.
  1287. config APM_ALLOW_INTS
  1288. bool "Allow interrupts during APM BIOS calls"
  1289. help
  1290. Normally we disable external interrupts while we are making calls to
  1291. the APM BIOS as a measure to lessen the effects of a badly behaving
  1292. BIOS implementation. The BIOS should reenable interrupts if it
  1293. needs to. Unfortunately, some BIOSes do not -- especially those in
  1294. many of the newer IBM Thinkpads. If you experience hangs when you
  1295. suspend, try setting this to Y. Otherwise, say N.
  1296. config APM_REAL_MODE_POWER_OFF
  1297. bool "Use real mode APM BIOS call to power off"
  1298. help
  1299. Use real mode APM BIOS calls to switch off the computer. This is
  1300. a work-around for a number of buggy BIOSes. Switch this option on if
  1301. your computer crashes instead of powering off properly.
  1302. endif # APM
  1303. source "arch/x86/kernel/cpu/cpufreq/Kconfig"
  1304. source "drivers/cpuidle/Kconfig"
  1305. endmenu
  1306. menu "Bus options (PCI etc.)"
  1307. config PCI
  1308. bool "PCI support"
  1309. default y
  1310. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1311. help
  1312. Find out whether you have a PCI motherboard. PCI is the name of a
  1313. bus system, i.e. the way the CPU talks to the other stuff inside
  1314. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1315. VESA. If you have PCI, say Y, otherwise N.
  1316. choice
  1317. prompt "PCI access mode"
  1318. depends on X86_32 && PCI
  1319. default PCI_GOANY
  1320. ---help---
  1321. On PCI systems, the BIOS can be used to detect the PCI devices and
  1322. determine their configuration. However, some old PCI motherboards
  1323. have BIOS bugs and may crash if this is done. Also, some embedded
  1324. PCI-based systems don't have any BIOS at all. Linux can also try to
  1325. detect the PCI hardware directly without using the BIOS.
  1326. With this option, you can specify how Linux should detect the
  1327. PCI devices. If you choose "BIOS", the BIOS will be used,
  1328. if you choose "Direct", the BIOS won't be used, and if you
  1329. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1330. If you choose "Any", the kernel will try MMCONFIG, then the
  1331. direct access method and falls back to the BIOS if that doesn't
  1332. work. If unsure, go with the default, which is "Any".
  1333. config PCI_GOBIOS
  1334. bool "BIOS"
  1335. config PCI_GOMMCONFIG
  1336. bool "MMConfig"
  1337. config PCI_GODIRECT
  1338. bool "Direct"
  1339. config PCI_GOOLPC
  1340. bool "OLPC"
  1341. depends on OLPC
  1342. config PCI_GOANY
  1343. bool "Any"
  1344. endchoice
  1345. config PCI_BIOS
  1346. def_bool y
  1347. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1348. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1349. config PCI_DIRECT
  1350. def_bool y
  1351. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1352. config PCI_MMCONFIG
  1353. def_bool y
  1354. depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
  1355. config PCI_OLPC
  1356. def_bool y
  1357. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1358. config PCI_DOMAINS
  1359. def_bool y
  1360. depends on PCI
  1361. config PCI_MMCONFIG
  1362. bool "Support mmconfig PCI config space access"
  1363. depends on X86_64 && PCI && ACPI
  1364. config DMAR
  1365. bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
  1366. depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
  1367. help
  1368. DMA remapping (DMAR) devices support enables independent address
  1369. translations for Direct Memory Access (DMA) from devices.
  1370. These DMA remapping devices are reported via ACPI tables
  1371. and include PCI device scope covered by these DMA
  1372. remapping devices.
  1373. config DMAR_GFX_WA
  1374. def_bool y
  1375. prompt "Support for Graphics workaround"
  1376. depends on DMAR
  1377. help
  1378. Current Graphics drivers tend to use physical address
  1379. for DMA and avoid using DMA APIs. Setting this config
  1380. option permits the IOMMU driver to set a unity map for
  1381. all the OS-visible memory. Hence the driver can continue
  1382. to use physical addresses for DMA.
  1383. config DMAR_FLOPPY_WA
  1384. def_bool y
  1385. depends on DMAR
  1386. help
  1387. Floppy disk drivers are know to bypass DMA API calls
  1388. thereby failing to work when IOMMU is enabled. This
  1389. workaround will setup a 1:1 mapping for the first
  1390. 16M to make floppy (an ISA device) work.
  1391. source "drivers/pci/pcie/Kconfig"
  1392. source "drivers/pci/Kconfig"
  1393. # x86_64 have no ISA slots, but do have ISA-style DMA.
  1394. config ISA_DMA_API
  1395. def_bool y
  1396. if X86_32
  1397. config ISA
  1398. bool "ISA support"
  1399. depends on !X86_VOYAGER
  1400. help
  1401. Find out whether you have ISA slots on your motherboard. ISA is the
  1402. name of a bus system, i.e. the way the CPU talks to the other stuff
  1403. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1404. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1405. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1406. config EISA
  1407. bool "EISA support"
  1408. depends on ISA
  1409. ---help---
  1410. The Extended Industry Standard Architecture (EISA) bus was
  1411. developed as an open alternative to the IBM MicroChannel bus.
  1412. The EISA bus provided some of the features of the IBM MicroChannel
  1413. bus while maintaining backward compatibility with cards made for
  1414. the older ISA bus. The EISA bus saw limited use between 1988 and
  1415. 1995 when it was made obsolete by the PCI bus.
  1416. Say Y here if you are building a kernel for an EISA-based machine.
  1417. Otherwise, say N.
  1418. source "drivers/eisa/Kconfig"
  1419. config MCA
  1420. bool "MCA support" if !X86_VOYAGER
  1421. default y if X86_VOYAGER
  1422. help
  1423. MicroChannel Architecture is found in some IBM PS/2 machines and
  1424. laptops. It is a bus system similar to PCI or ISA. See
  1425. <file:Documentation/mca.txt> (and especially the web page given
  1426. there) before attempting to build an MCA bus kernel.
  1427. source "drivers/mca/Kconfig"
  1428. config SCx200
  1429. tristate "NatSemi SCx200 support"
  1430. depends on !X86_VOYAGER
  1431. help
  1432. This provides basic support for National Semiconductor's
  1433. (now AMD's) Geode processors. The driver probes for the
  1434. PCI-IDs of several on-chip devices, so its a good dependency
  1435. for other scx200_* drivers.
  1436. If compiled as a module, the driver is named scx200.
  1437. config SCx200HR_TIMER
  1438. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1439. depends on SCx200 && GENERIC_TIME
  1440. default y
  1441. help
  1442. This driver provides a clocksource built upon the on-chip
  1443. 27MHz high-resolution timer. Its also a workaround for
  1444. NSC Geode SC-1100's buggy TSC, which loses time when the
  1445. processor goes idle (as is done by the scheduler). The
  1446. other workaround is idle=poll boot option.
  1447. config GEODE_MFGPT_TIMER
  1448. def_bool y
  1449. prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
  1450. depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
  1451. help
  1452. This driver provides a clock event source based on the MFGPT
  1453. timer(s) in the CS5535 and CS5536 companion chip for the geode.
  1454. MFGPTs have a better resolution and max interval than the
  1455. generic PIT, and are suitable for use as high-res timers.
  1456. config OLPC
  1457. bool "One Laptop Per Child support"
  1458. default n
  1459. help
  1460. Add support for detecting the unique features of the OLPC
  1461. XO hardware.
  1462. endif # X86_32
  1463. config K8_NB
  1464. def_bool y
  1465. depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
  1466. source "drivers/pcmcia/Kconfig"
  1467. source "drivers/pci/hotplug/Kconfig"
  1468. endmenu
  1469. menu "Executable file formats / Emulations"
  1470. source "fs/Kconfig.binfmt"
  1471. config IA32_EMULATION
  1472. bool "IA32 Emulation"
  1473. depends on X86_64
  1474. select COMPAT_BINFMT_ELF
  1475. help
  1476. Include code to run 32-bit programs under a 64-bit kernel. You should
  1477. likely turn this on, unless you're 100% sure that you don't have any
  1478. 32-bit programs left.
  1479. config IA32_AOUT
  1480. tristate "IA32 a.out support"
  1481. depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
  1482. help
  1483. Support old a.out binaries in the 32bit emulation.
  1484. config COMPAT
  1485. def_bool y
  1486. depends on IA32_EMULATION
  1487. config COMPAT_FOR_U64_ALIGNMENT
  1488. def_bool COMPAT
  1489. depends on X86_64
  1490. config SYSVIPC_COMPAT
  1491. def_bool y
  1492. depends on X86_64 && COMPAT && SYSVIPC
  1493. endmenu
  1494. source "net/Kconfig"
  1495. source "drivers/Kconfig"
  1496. source "drivers/firmware/Kconfig"
  1497. source "fs/Kconfig"
  1498. source "arch/x86/Kconfig.debug"
  1499. source "security/Kconfig"
  1500. source "crypto/Kconfig"
  1501. source "arch/x86/kvm/Kconfig"
  1502. source "lib/Kconfig"