Kconfig 62 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_AOUT if X86_32
  18. select HAVE_UNSTABLE_SCHED_CLOCK
  19. select HAVE_IDE
  20. select HAVE_OPROFILE
  21. select HAVE_IOREMAP_PROT
  22. select HAVE_KPROBES
  23. select ARCH_WANT_OPTIONAL_GPIOLIB
  24. select HAVE_KRETPROBES
  25. select HAVE_FTRACE_MCOUNT_RECORD
  26. select HAVE_DYNAMIC_FTRACE
  27. select HAVE_FUNCTION_TRACER
  28. select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
  29. select HAVE_ARCH_KGDB if !X86_VOYAGER
  30. select HAVE_ARCH_TRACEHOOK
  31. select HAVE_GENERIC_DMA_COHERENT if X86_32
  32. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  33. config ARCH_DEFCONFIG
  34. string
  35. default "arch/x86/configs/i386_defconfig" if X86_32
  36. default "arch/x86/configs/x86_64_defconfig" if X86_64
  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. bool
  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_CPU_IDLE_WAIT
  81. def_bool y
  82. config GENERIC_CALIBRATE_DELAY
  83. def_bool y
  84. config GENERIC_TIME_VSYSCALL
  85. bool
  86. default X86_64
  87. config ARCH_HAS_CPU_RELAX
  88. def_bool y
  89. config ARCH_HAS_DEFAULT_IDLE
  90. def_bool y
  91. config ARCH_HAS_CACHE_LINE_SIZE
  92. def_bool y
  93. config HAVE_SETUP_PER_CPU_AREA
  94. def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
  95. config HAVE_CPUMASK_OF_CPU_MAP
  96. def_bool X86_64_SMP
  97. config ARCH_HIBERNATION_POSSIBLE
  98. def_bool y
  99. depends on !SMP || !X86_VOYAGER
  100. config ARCH_SUSPEND_POSSIBLE
  101. def_bool y
  102. depends on !X86_VOYAGER
  103. config ZONE_DMA32
  104. bool
  105. default X86_64
  106. config ARCH_POPULATES_NODE_MAP
  107. def_bool y
  108. config AUDIT_ARCH
  109. bool
  110. default X86_64
  111. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  112. def_bool y
  113. # Use the generic interrupt handling code in kernel/irq/:
  114. config GENERIC_HARDIRQS
  115. bool
  116. default y
  117. config GENERIC_IRQ_PROBE
  118. bool
  119. default y
  120. config GENERIC_PENDING_IRQ
  121. bool
  122. depends on GENERIC_HARDIRQS && SMP
  123. default y
  124. config X86_SMP
  125. bool
  126. depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
  127. default y
  128. config USE_GENERIC_SMP_HELPERS
  129. def_bool y
  130. depends on SMP
  131. config X86_32_SMP
  132. def_bool y
  133. depends on X86_32 && SMP
  134. config X86_64_SMP
  135. def_bool y
  136. depends on X86_64 && SMP
  137. config X86_HT
  138. bool
  139. depends on SMP
  140. depends on (X86_32 && !X86_VOYAGER) || X86_64
  141. default y
  142. config X86_BIOS_REBOOT
  143. bool
  144. depends on !X86_VOYAGER
  145. default y
  146. config X86_TRAMPOLINE
  147. bool
  148. depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
  149. default y
  150. config KTIME_SCALAR
  151. def_bool X86_32
  152. source "init/Kconfig"
  153. source "kernel/Kconfig.freezer"
  154. menu "Processor type and features"
  155. source "kernel/time/Kconfig"
  156. config SMP
  157. bool "Symmetric multi-processing support"
  158. ---help---
  159. This enables support for systems with more than one CPU. If you have
  160. a system with only one CPU, like most personal computers, say N. If
  161. you have a system with more than one CPU, say Y.
  162. If you say N here, the kernel will run on single and multiprocessor
  163. machines, but will use only one CPU of a multiprocessor machine. If
  164. you say Y here, the kernel will run on many, but not all,
  165. singleprocessor machines. On a singleprocessor machine, the kernel
  166. will run faster if you say N here.
  167. Note that if you say Y here and choose architecture "586" or
  168. "Pentium" under "Processor family", the kernel will not work on 486
  169. architectures. Similarly, multiprocessor kernels for the "PPro"
  170. architecture may not work on all Pentium based boards.
  171. People using multiprocessor machines who say Y here should also say
  172. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  173. Management" code will be disabled if you say Y here.
  174. See also <file:Documentation/i386/IO-APIC.txt>,
  175. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  176. <http://www.tldp.org/docs.html#howto>.
  177. If you don't know what to do here, say N.
  178. config X86_HAS_BOOT_CPU_ID
  179. def_bool y
  180. depends on X86_VOYAGER
  181. config SPARSE_IRQ
  182. bool "Support sparse irq numbering"
  183. depends on PCI_MSI || HT_IRQ
  184. help
  185. This enables support for sparse irqs. This is useful for distro
  186. kernels that want to define a high CONFIG_NR_CPUS value but still
  187. want to have low kernel memory footprint on smaller machines.
  188. ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
  189. out the irq_desc[] array in a more NUMA-friendly way. )
  190. If you don't know what to do here, say N.
  191. config NUMA_MIGRATE_IRQ_DESC
  192. bool "Move irq desc when changing irq smp_affinity"
  193. depends on SPARSE_IRQ && NUMA
  194. default n
  195. help
  196. This enables moving irq_desc to cpu/node that irq will use handled.
  197. If you don't know what to do here, say N.
  198. config X86_FIND_SMP_CONFIG
  199. def_bool y
  200. depends on X86_MPPARSE || X86_VOYAGER
  201. if ACPI
  202. config X86_MPPARSE
  203. def_bool y
  204. bool "Enable MPS table"
  205. depends on X86_LOCAL_APIC
  206. help
  207. For old smp systems that do not have proper acpi support. Newer systems
  208. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  209. endif
  210. if !ACPI
  211. config X86_MPPARSE
  212. def_bool y
  213. depends on X86_LOCAL_APIC
  214. endif
  215. choice
  216. prompt "Subarchitecture Type"
  217. default X86_PC
  218. config X86_PC
  219. bool "PC-compatible"
  220. help
  221. Choose this option if your computer is a standard PC or compatible.
  222. config X86_ELAN
  223. bool "AMD Elan"
  224. depends on X86_32
  225. help
  226. Select this for an AMD Elan processor.
  227. Do not use this option for K6/Athlon/Opteron processors!
  228. If unsure, choose "PC-compatible" instead.
  229. config X86_VOYAGER
  230. bool "Voyager (NCR)"
  231. depends on X86_32 && (SMP || BROKEN) && !PCI
  232. help
  233. Voyager is an MCA-based 32-way capable SMP architecture proprietary
  234. to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
  235. *** WARNING ***
  236. If you do not specifically know you have a Voyager based machine,
  237. say N here, otherwise the kernel you build will not be bootable.
  238. config X86_GENERICARCH
  239. bool "Generic architecture"
  240. depends on X86_32
  241. help
  242. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  243. subarchitectures. It is intended for a generic binary kernel.
  244. if you select them all, kernel will probe it one by one. and will
  245. fallback to default.
  246. if X86_GENERICARCH
  247. config X86_NUMAQ
  248. bool "NUMAQ (IBM/Sequent)"
  249. depends on SMP && X86_32 && PCI && X86_MPPARSE
  250. select NUMA
  251. help
  252. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  253. NUMA multiquad box. This changes the way that processors are
  254. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  255. of Flat Logical. You will need a new lynxer.elf file to flash your
  256. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  257. config X86_SUMMIT
  258. bool "Summit/EXA (IBM x440)"
  259. depends on X86_32 && SMP
  260. help
  261. This option is needed for IBM systems that use the Summit/EXA chipset.
  262. In particular, it is needed for the x440.
  263. config X86_ES7000
  264. bool "Support for Unisys ES7000 IA32 series"
  265. depends on X86_32 && SMP
  266. help
  267. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  268. supposed to run on an IA32-based Unisys ES7000 system.
  269. config X86_BIGSMP
  270. bool "Support for big SMP systems with more than 8 CPUs"
  271. depends on X86_32 && SMP
  272. help
  273. This option is needed for the systems that have more than 8 CPUs
  274. and if the system is not of any sub-arch type above.
  275. endif
  276. config X86_VSMP
  277. bool "Support for ScaleMP vSMP"
  278. select PARAVIRT
  279. depends on X86_64 && PCI
  280. help
  281. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  282. supposed to run on these EM64T-based machines. Only choose this option
  283. if you have one of these machines.
  284. endchoice
  285. config X86_VISWS
  286. bool "SGI 320/540 (Visual Workstation)"
  287. depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
  288. help
  289. The SGI Visual Workstation series is an IA32-based workstation
  290. based on SGI systems chips with some legacy PC hardware attached.
  291. Say Y here to create a kernel to run on the SGI 320 or 540.
  292. A kernel compiled for the Visual Workstation will run on general
  293. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  294. config X86_RDC321X
  295. bool "RDC R-321x SoC"
  296. depends on X86_32
  297. select M486
  298. select X86_REBOOTFIXUPS
  299. help
  300. This option is needed for RDC R-321x system-on-chip, also known
  301. as R-8610-(G).
  302. If you don't have one of these chips, you should say N here.
  303. config SCHED_NO_NO_OMIT_FRAME_POINTER
  304. def_bool y
  305. prompt "Single-depth WCHAN output"
  306. depends on X86_32
  307. help
  308. Calculate simpler /proc/<PID>/wchan values. If this option
  309. is disabled then wchan values will recurse back to the
  310. caller function. This provides more accurate wchan values,
  311. at the expense of slightly more scheduling overhead.
  312. If in doubt, say "Y".
  313. menuconfig PARAVIRT_GUEST
  314. bool "Paravirtualized guest support"
  315. help
  316. Say Y here to get to see options related to running Linux under
  317. various hypervisors. This option alone does not add any kernel code.
  318. If you say N, all options in this submenu will be skipped and disabled.
  319. if PARAVIRT_GUEST
  320. source "arch/x86/xen/Kconfig"
  321. config VMI
  322. bool "VMI Guest support"
  323. select PARAVIRT
  324. depends on X86_32
  325. depends on !X86_VOYAGER
  326. help
  327. VMI provides a paravirtualized interface to the VMware ESX server
  328. (it could be used by other hypervisors in theory too, but is not
  329. at the moment), by linking the kernel to a GPL-ed ROM module
  330. provided by the hypervisor.
  331. config KVM_CLOCK
  332. bool "KVM paravirtualized clock"
  333. select PARAVIRT
  334. select PARAVIRT_CLOCK
  335. depends on !X86_VOYAGER
  336. help
  337. Turning on this option will allow you to run a paravirtualized clock
  338. when running over the KVM hypervisor. Instead of relying on a PIT
  339. (or probably other) emulation by the underlying device model, the host
  340. provides the guest with timing infrastructure such as time of day, and
  341. system time
  342. config KVM_GUEST
  343. bool "KVM Guest support"
  344. select PARAVIRT
  345. depends on !X86_VOYAGER
  346. help
  347. This option enables various optimizations for running under the KVM
  348. hypervisor.
  349. source "arch/x86/lguest/Kconfig"
  350. config PARAVIRT
  351. bool "Enable paravirtualization code"
  352. depends on !X86_VOYAGER
  353. help
  354. This changes the kernel so it can modify itself when it is run
  355. under a hypervisor, potentially improving performance significantly
  356. over full virtualization. However, when run without a hypervisor
  357. the kernel is theoretically slower and slightly larger.
  358. config PARAVIRT_CLOCK
  359. bool
  360. default n
  361. endif
  362. config PARAVIRT_DEBUG
  363. bool "paravirt-ops debugging"
  364. depends on PARAVIRT && DEBUG_KERNEL
  365. help
  366. Enable to debug paravirt_ops internals. Specifically, BUG if
  367. a paravirt_op is missing when it is called.
  368. config MEMTEST
  369. bool "Memtest"
  370. help
  371. This option adds a kernel parameter 'memtest', which allows memtest
  372. to be set.
  373. memtest=0, mean disabled; -- default
  374. memtest=1, mean do 1 test pattern;
  375. ...
  376. memtest=4, mean do 4 test patterns.
  377. If you are unsure how to answer this question, answer N.
  378. config X86_SUMMIT_NUMA
  379. def_bool y
  380. depends on X86_32 && NUMA && X86_GENERICARCH
  381. config X86_CYCLONE_TIMER
  382. def_bool y
  383. depends on X86_GENERICARCH
  384. config ES7000_CLUSTERED_APIC
  385. def_bool y
  386. depends on SMP && X86_ES7000 && MPENTIUMIII
  387. source "arch/x86/Kconfig.cpu"
  388. config HPET_TIMER
  389. def_bool X86_64
  390. prompt "HPET Timer Support" if X86_32
  391. help
  392. Use the IA-PC HPET (High Precision Event Timer) to manage
  393. time in preference to the PIT and RTC, if a HPET is
  394. present.
  395. HPET is the next generation timer replacing legacy 8254s.
  396. The HPET provides a stable time base on SMP
  397. systems, unlike the TSC, but it is more expensive to access,
  398. as it is off-chip. You can find the HPET spec at
  399. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  400. You can safely choose Y here. However, HPET will only be
  401. activated if the platform and the BIOS support this feature.
  402. Otherwise the 8254 will be used for timing services.
  403. Choose N to continue using the legacy 8254 timer.
  404. config HPET_EMULATE_RTC
  405. def_bool y
  406. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  407. # Mark as embedded because too many people got it wrong.
  408. # The code disables itself when not needed.
  409. config DMI
  410. default y
  411. bool "Enable DMI scanning" if EMBEDDED
  412. help
  413. Enabled scanning of DMI to identify machine quirks. Say Y
  414. here unless you have verified that your setup is not
  415. affected by entries in the DMI blacklist. Required by PNP
  416. BIOS code.
  417. config GART_IOMMU
  418. bool "GART IOMMU support" if EMBEDDED
  419. default y
  420. select SWIOTLB
  421. select AGP
  422. depends on X86_64 && PCI
  423. help
  424. Support for full DMA access of devices with 32bit memory access only
  425. on systems with more than 3GB. This is usually needed for USB,
  426. sound, many IDE/SATA chipsets and some other devices.
  427. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  428. based hardware IOMMU and a software bounce buffer based IOMMU used
  429. on Intel systems and as fallback.
  430. The code is only active when needed (enough memory and limited
  431. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  432. too.
  433. config CALGARY_IOMMU
  434. bool "IBM Calgary IOMMU support"
  435. select SWIOTLB
  436. depends on X86_64 && PCI && EXPERIMENTAL
  437. help
  438. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  439. systems. Needed to run systems with more than 3GB of memory
  440. properly with 32-bit PCI devices that do not support DAC
  441. (Double Address Cycle). Calgary also supports bus level
  442. isolation, where all DMAs pass through the IOMMU. This
  443. prevents them from going anywhere except their intended
  444. destination. This catches hard-to-find kernel bugs and
  445. mis-behaving drivers and devices that do not use the DMA-API
  446. properly to set up their DMA buffers. The IOMMU can be
  447. turned off at boot time with the iommu=off parameter.
  448. Normally the kernel will make the right choice by itself.
  449. If unsure, say Y.
  450. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  451. def_bool y
  452. prompt "Should Calgary be enabled by default?"
  453. depends on CALGARY_IOMMU
  454. help
  455. Should Calgary be enabled by default? if you choose 'y', Calgary
  456. will be used (if it exists). If you choose 'n', Calgary will not be
  457. used even if it exists. If you choose 'n' and would like to use
  458. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  459. If unsure, say Y.
  460. config AMD_IOMMU
  461. bool "AMD IOMMU support"
  462. select SWIOTLB
  463. select PCI_MSI
  464. depends on X86_64 && PCI && ACPI
  465. help
  466. With this option you can enable support for AMD IOMMU hardware in
  467. your system. An IOMMU is a hardware component which provides
  468. remapping of DMA memory accesses from devices. With an AMD IOMMU you
  469. can isolate the the DMA memory of different devices and protect the
  470. system from misbehaving device drivers or hardware.
  471. You can find out if your system has an AMD IOMMU if you look into
  472. your BIOS for an option to enable it or if you have an IVRS ACPI
  473. table.
  474. # need this always selected by IOMMU for the VIA workaround
  475. config SWIOTLB
  476. bool
  477. help
  478. Support for software bounce buffers used on x86-64 systems
  479. which don't have a hardware IOMMU (e.g. the current generation
  480. of Intel's x86-64 CPUs). Using this PCI devices which can only
  481. access 32-bits of memory can be used on systems with more than
  482. 3 GB of memory. If unsure, say Y.
  483. config IOMMU_HELPER
  484. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  485. config MAXSMP
  486. bool "Configure Maximum number of SMP Processors and NUMA Nodes"
  487. depends on X86_64 && SMP && BROKEN
  488. default n
  489. help
  490. Configure maximum number of CPUS and NUMA Nodes for this architecture.
  491. If unsure, say N.
  492. config NR_CPUS
  493. int "Maximum number of CPUs (2-512)" if !MAXSMP
  494. range 2 512
  495. depends on SMP
  496. default "4096" if MAXSMP
  497. default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
  498. default "8"
  499. help
  500. This allows you to specify the maximum number of CPUs which this
  501. kernel will support. The maximum supported value is 512 and the
  502. minimum value which makes sense is 2.
  503. This is purely to save memory - each supported CPU adds
  504. approximately eight kilobytes to the kernel image.
  505. config SCHED_SMT
  506. bool "SMT (Hyperthreading) scheduler support"
  507. depends on X86_HT
  508. help
  509. SMT scheduler support improves the CPU scheduler's decision making
  510. when dealing with Intel Pentium 4 chips with HyperThreading at a
  511. cost of slightly increased overhead in some places. If unsure say
  512. N here.
  513. config SCHED_MC
  514. def_bool y
  515. prompt "Multi-core scheduler support"
  516. depends on X86_HT
  517. help
  518. Multi-core scheduler support improves the CPU scheduler's decision
  519. making when dealing with multi-core CPU chips at a cost of slightly
  520. increased overhead in some places. If unsure say N here.
  521. source "kernel/Kconfig.preempt"
  522. config X86_UP_APIC
  523. bool "Local APIC support on uniprocessors"
  524. depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
  525. help
  526. A local APIC (Advanced Programmable Interrupt Controller) is an
  527. integrated interrupt controller in the CPU. If you have a single-CPU
  528. system which has a processor with a local APIC, you can say Y here to
  529. enable and use it. If you say Y here even though your machine doesn't
  530. have a local APIC, then the kernel will still run with no slowdown at
  531. all. The local APIC supports CPU-generated self-interrupts (timer,
  532. performance counters), and the NMI watchdog which detects hard
  533. lockups.
  534. config X86_UP_IOAPIC
  535. bool "IO-APIC support on uniprocessors"
  536. depends on X86_UP_APIC
  537. help
  538. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  539. SMP-capable replacement for PC-style interrupt controllers. Most
  540. SMP systems and many recent uniprocessor systems have one.
  541. If you have a single-CPU system with an IO-APIC, you can say Y here
  542. to use it. If you say Y here even though your machine doesn't have
  543. an IO-APIC, then the kernel will still run with no slowdown at all.
  544. config X86_LOCAL_APIC
  545. def_bool y
  546. depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  547. config X86_IO_APIC
  548. def_bool y
  549. depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  550. config X86_VISWS_APIC
  551. def_bool y
  552. depends on X86_32 && X86_VISWS
  553. config X86_MCE
  554. bool "Machine Check Exception"
  555. depends on !X86_VOYAGER
  556. ---help---
  557. Machine Check Exception support allows the processor to notify the
  558. kernel if it detects a problem (e.g. overheating, component failure).
  559. The action the kernel takes depends on the severity of the problem,
  560. ranging from a warning message on the console, to halting the machine.
  561. Your processor must be a Pentium or newer to support this - check the
  562. flags in /proc/cpuinfo for mce. Note that some older Pentium systems
  563. have a design flaw which leads to false MCE events - hence MCE is
  564. disabled on all P5 processors, unless explicitly enabled with "mce"
  565. as a boot argument. Similarly, if MCE is built in and creates a
  566. problem on some new non-standard machine, you can boot with "nomce"
  567. to disable it. MCE support simply ignores non-MCE processors like
  568. the 386 and 486, so nearly everyone can say Y here.
  569. config X86_MCE_INTEL
  570. def_bool y
  571. prompt "Intel MCE features"
  572. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  573. help
  574. Additional support for intel specific MCE features such as
  575. the thermal monitor.
  576. config X86_MCE_AMD
  577. def_bool y
  578. prompt "AMD MCE features"
  579. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  580. help
  581. Additional support for AMD specific MCE features such as
  582. the DRAM Error Threshold.
  583. config X86_MCE_NONFATAL
  584. tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
  585. depends on X86_32 && X86_MCE
  586. help
  587. Enabling this feature starts a timer that triggers every 5 seconds which
  588. will look at the machine check registers to see if anything happened.
  589. Non-fatal problems automatically get corrected (but still logged).
  590. Disable this if you don't want to see these messages.
  591. Seeing the messages this option prints out may be indicative of dying
  592. or out-of-spec (ie, overclocked) hardware.
  593. This option only does something on certain CPUs.
  594. (AMD Athlon/Duron and Intel Pentium 4)
  595. config X86_MCE_P4THERMAL
  596. bool "check for P4 thermal throttling interrupt."
  597. depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
  598. help
  599. Enabling this feature will cause a message to be printed when the P4
  600. enters thermal throttling.
  601. config VM86
  602. bool "Enable VM86 support" if EMBEDDED
  603. default y
  604. depends on X86_32
  605. help
  606. This option is required by programs like DOSEMU to run 16-bit legacy
  607. code on X86 processors. It also may be needed by software like
  608. XFree86 to initialize some video cards via BIOS. Disabling this
  609. option saves about 6k.
  610. config TOSHIBA
  611. tristate "Toshiba Laptop support"
  612. depends on X86_32
  613. ---help---
  614. This adds a driver to safely access the System Management Mode of
  615. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  616. not work on models with a Phoenix BIOS. The System Management Mode
  617. is used to set the BIOS and power saving options on Toshiba portables.
  618. For information on utilities to make use of this driver see the
  619. Toshiba Linux utilities web site at:
  620. <http://www.buzzard.org.uk/toshiba/>.
  621. Say Y if you intend to run this kernel on a Toshiba portable.
  622. Say N otherwise.
  623. config I8K
  624. tristate "Dell laptop support"
  625. ---help---
  626. This adds a driver to safely access the System Management Mode
  627. of the CPU on the Dell Inspiron 8000. The System Management Mode
  628. is used to read cpu temperature and cooling fan status and to
  629. control the fans on the I8K portables.
  630. This driver has been tested only on the Inspiron 8000 but it may
  631. also work with other Dell laptops. You can force loading on other
  632. models by passing the parameter `force=1' to the module. Use at
  633. your own risk.
  634. For information on utilities to make use of this driver see the
  635. I8K Linux utilities web site at:
  636. <http://people.debian.org/~dz/i8k/>
  637. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  638. Say N otherwise.
  639. config X86_REBOOTFIXUPS
  640. bool "Enable X86 board specific fixups for reboot"
  641. depends on X86_32
  642. ---help---
  643. This enables chipset and/or board specific fixups to be done
  644. in order to get reboot to work correctly. This is only needed on
  645. some combinations of hardware and BIOS. The symptom, for which
  646. this config is intended, is when reboot ends with a stalled/hung
  647. system.
  648. Currently, the only fixup is for the Geode machines using
  649. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  650. Say Y if you want to enable the fixup. Currently, it's safe to
  651. enable this option even if you don't need it.
  652. Say N otherwise.
  653. config MICROCODE
  654. tristate "/dev/cpu/microcode - microcode support"
  655. select FW_LOADER
  656. ---help---
  657. If you say Y here, you will be able to update the microcode on
  658. certain Intel and AMD processors. The Intel support is for the
  659. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  660. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  661. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  662. You will obviously need the actual microcode binary data itself
  663. which is not shipped with the Linux kernel.
  664. This option selects the general module only, you need to select
  665. at least one vendor specific module as well.
  666. To compile this driver as a module, choose M here: the
  667. module will be called microcode.
  668. config MICROCODE_INTEL
  669. bool "Intel microcode patch loading support"
  670. depends on MICROCODE
  671. default MICROCODE
  672. select FW_LOADER
  673. --help---
  674. This options enables microcode patch loading support for Intel
  675. processors.
  676. For latest news and information on obtaining all the required
  677. Intel ingredients for this driver, check:
  678. <http://www.urbanmyth.org/microcode/>.
  679. config MICROCODE_AMD
  680. bool "AMD microcode patch loading support"
  681. depends on MICROCODE
  682. select FW_LOADER
  683. --help---
  684. If you select this option, microcode patch loading support for AMD
  685. processors will be enabled.
  686. config MICROCODE_OLD_INTERFACE
  687. def_bool y
  688. depends on MICROCODE
  689. config X86_MSR
  690. tristate "/dev/cpu/*/msr - Model-specific register support"
  691. help
  692. This device gives privileged processes access to the x86
  693. Model-Specific Registers (MSRs). It is a character device with
  694. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  695. MSR accesses are directed to a specific CPU on multi-processor
  696. systems.
  697. config X86_CPUID
  698. tristate "/dev/cpu/*/cpuid - CPU information support"
  699. help
  700. This device gives processes access to the x86 CPUID instruction to
  701. be executed on a specific processor. It is a character device
  702. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  703. /dev/cpu/31/cpuid.
  704. choice
  705. prompt "High Memory Support"
  706. default HIGHMEM4G if !X86_NUMAQ
  707. default HIGHMEM64G if X86_NUMAQ
  708. depends on X86_32
  709. config NOHIGHMEM
  710. bool "off"
  711. depends on !X86_NUMAQ
  712. ---help---
  713. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  714. However, the address space of 32-bit x86 processors is only 4
  715. Gigabytes large. That means that, if you have a large amount of
  716. physical memory, not all of it can be "permanently mapped" by the
  717. kernel. The physical memory that's not permanently mapped is called
  718. "high memory".
  719. If you are compiling a kernel which will never run on a machine with
  720. more than 1 Gigabyte total physical RAM, answer "off" here (default
  721. choice and suitable for most users). This will result in a "3GB/1GB"
  722. split: 3GB are mapped so that each process sees a 3GB virtual memory
  723. space and the remaining part of the 4GB virtual memory space is used
  724. by the kernel to permanently map as much physical memory as
  725. possible.
  726. If the machine has between 1 and 4 Gigabytes physical RAM, then
  727. answer "4GB" here.
  728. If more than 4 Gigabytes is used then answer "64GB" here. This
  729. selection turns Intel PAE (Physical Address Extension) mode on.
  730. PAE implements 3-level paging on IA32 processors. PAE is fully
  731. supported by Linux, PAE mode is implemented on all recent Intel
  732. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  733. then the kernel will not boot on CPUs that don't support PAE!
  734. The actual amount of total physical memory will either be
  735. auto detected or can be forced by using a kernel command line option
  736. such as "mem=256M". (Try "man bootparam" or see the documentation of
  737. your boot loader (lilo or loadlin) about how to pass options to the
  738. kernel at boot time.)
  739. If unsure, say "off".
  740. config HIGHMEM4G
  741. bool "4GB"
  742. depends on !X86_NUMAQ
  743. help
  744. Select this if you have a 32-bit processor and between 1 and 4
  745. gigabytes of physical RAM.
  746. config HIGHMEM64G
  747. bool "64GB"
  748. depends on !M386 && !M486
  749. select X86_PAE
  750. help
  751. Select this if you have a 32-bit processor and more than 4
  752. gigabytes of physical RAM.
  753. endchoice
  754. choice
  755. depends on EXPERIMENTAL
  756. prompt "Memory split" if EMBEDDED
  757. default VMSPLIT_3G
  758. depends on X86_32
  759. help
  760. Select the desired split between kernel and user memory.
  761. If the address range available to the kernel is less than the
  762. physical memory installed, the remaining memory will be available
  763. as "high memory". Accessing high memory is a little more costly
  764. than low memory, as it needs to be mapped into the kernel first.
  765. Note that increasing the kernel address space limits the range
  766. available to user programs, making the address space there
  767. tighter. Selecting anything other than the default 3G/1G split
  768. will also likely make your kernel incompatible with binary-only
  769. kernel modules.
  770. If you are not absolutely sure what you are doing, leave this
  771. option alone!
  772. config VMSPLIT_3G
  773. bool "3G/1G user/kernel split"
  774. config VMSPLIT_3G_OPT
  775. depends on !X86_PAE
  776. bool "3G/1G user/kernel split (for full 1G low memory)"
  777. config VMSPLIT_2G
  778. bool "2G/2G user/kernel split"
  779. config VMSPLIT_2G_OPT
  780. depends on !X86_PAE
  781. bool "2G/2G user/kernel split (for full 2G low memory)"
  782. config VMSPLIT_1G
  783. bool "1G/3G user/kernel split"
  784. endchoice
  785. config PAGE_OFFSET
  786. hex
  787. default 0xB0000000 if VMSPLIT_3G_OPT
  788. default 0x80000000 if VMSPLIT_2G
  789. default 0x78000000 if VMSPLIT_2G_OPT
  790. default 0x40000000 if VMSPLIT_1G
  791. default 0xC0000000
  792. depends on X86_32
  793. config HIGHMEM
  794. def_bool y
  795. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  796. config X86_PAE
  797. bool "PAE (Physical Address Extension) Support"
  798. depends on X86_32 && !HIGHMEM4G
  799. help
  800. PAE is required for NX support, and furthermore enables
  801. larger swapspace support for non-overcommit purposes. It
  802. has the cost of more pagetable lookup overhead, and also
  803. consumes more pagetable space per process.
  804. config ARCH_PHYS_ADDR_T_64BIT
  805. def_bool X86_64 || X86_PAE
  806. # Common NUMA Features
  807. config NUMA
  808. bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
  809. depends on SMP
  810. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  811. default n if X86_PC
  812. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  813. help
  814. Enable NUMA (Non Uniform Memory Access) support.
  815. The kernel will try to allocate memory used by a CPU on the
  816. local memory controller of the CPU and add some more
  817. NUMA awareness to the kernel.
  818. For 32-bit this is currently highly experimental and should be only
  819. used for kernel development. It might also cause boot failures.
  820. For 64-bit this is recommended on all multiprocessor Opteron systems.
  821. If the system is EM64T, you should say N unless your system is
  822. EM64T NUMA.
  823. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  824. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  825. config K8_NUMA
  826. def_bool y
  827. prompt "Old style AMD Opteron NUMA detection"
  828. depends on X86_64 && NUMA && PCI
  829. help
  830. Enable K8 NUMA node topology detection. You should say Y here if
  831. you have a multi processor AMD K8 system. This uses an old
  832. method to read the NUMA configuration directly from the builtin
  833. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  834. instead, which also takes priority if both are compiled in.
  835. config X86_64_ACPI_NUMA
  836. def_bool y
  837. prompt "ACPI NUMA detection"
  838. depends on X86_64 && NUMA && ACPI && PCI
  839. select ACPI_NUMA
  840. help
  841. Enable ACPI SRAT based node topology detection.
  842. # Some NUMA nodes have memory ranges that span
  843. # other nodes. Even though a pfn is valid and
  844. # between a node's start and end pfns, it may not
  845. # reside on that node. See memmap_init_zone()
  846. # for details.
  847. config NODES_SPAN_OTHER_NODES
  848. def_bool y
  849. depends on X86_64_ACPI_NUMA
  850. config NUMA_EMU
  851. bool "NUMA emulation"
  852. depends on X86_64 && NUMA
  853. help
  854. Enable NUMA emulation. A flat machine will be split
  855. into virtual nodes when booted with "numa=fake=N", where N is the
  856. number of nodes. This is only useful for debugging.
  857. config NODES_SHIFT
  858. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  859. range 1 9 if X86_64
  860. default "9" if MAXSMP
  861. default "6" if X86_64
  862. default "4" if X86_NUMAQ
  863. default "3"
  864. depends on NEED_MULTIPLE_NODES
  865. help
  866. Specify the maximum number of NUMA Nodes available on the target
  867. system. Increases memory reserved to accomodate various tables.
  868. config HAVE_ARCH_BOOTMEM_NODE
  869. def_bool y
  870. depends on X86_32 && NUMA
  871. config ARCH_HAVE_MEMORY_PRESENT
  872. def_bool y
  873. depends on X86_32 && DISCONTIGMEM
  874. config NEED_NODE_MEMMAP_SIZE
  875. def_bool y
  876. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  877. config HAVE_ARCH_ALLOC_REMAP
  878. def_bool y
  879. depends on X86_32 && NUMA
  880. config ARCH_FLATMEM_ENABLE
  881. def_bool y
  882. depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
  883. config ARCH_DISCONTIGMEM_ENABLE
  884. def_bool y
  885. depends on NUMA && X86_32
  886. config ARCH_DISCONTIGMEM_DEFAULT
  887. def_bool y
  888. depends on NUMA && X86_32
  889. config ARCH_SPARSEMEM_DEFAULT
  890. def_bool y
  891. depends on X86_64
  892. config ARCH_SPARSEMEM_ENABLE
  893. def_bool y
  894. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_GENERICARCH
  895. select SPARSEMEM_STATIC if X86_32
  896. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  897. config ARCH_SELECT_MEMORY_MODEL
  898. def_bool y
  899. depends on ARCH_SPARSEMEM_ENABLE
  900. config ARCH_MEMORY_PROBE
  901. def_bool X86_64
  902. depends on MEMORY_HOTPLUG
  903. source "mm/Kconfig"
  904. config HIGHPTE
  905. bool "Allocate 3rd-level pagetables from highmem"
  906. depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
  907. help
  908. The VM uses one page table entry for each page of physical memory.
  909. For systems with a lot of RAM, this can be wasteful of precious
  910. low memory. Setting this option will put user-space page table
  911. entries in high memory.
  912. config X86_CHECK_BIOS_CORRUPTION
  913. bool "Check for low memory corruption"
  914. help
  915. Periodically check for memory corruption in low memory, which
  916. is suspected to be caused by BIOS. Even when enabled in the
  917. configuration, it is disabled at runtime. Enable it by
  918. setting "memory_corruption_check=1" on the kernel command
  919. line. By default it scans the low 64k of memory every 60
  920. seconds; see the memory_corruption_check_size and
  921. memory_corruption_check_period parameters in
  922. Documentation/kernel-parameters.txt to adjust this.
  923. When enabled with the default parameters, this option has
  924. almost no overhead, as it reserves a relatively small amount
  925. of memory and scans it infrequently. It both detects corruption
  926. and prevents it from affecting the running system.
  927. It is, however, intended as a diagnostic tool; if repeatable
  928. BIOS-originated corruption always affects the same memory,
  929. you can use memmap= to prevent the kernel from using that
  930. memory.
  931. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  932. bool "Set the default setting of memory_corruption_check"
  933. depends on X86_CHECK_BIOS_CORRUPTION
  934. default y
  935. help
  936. Set whether the default state of memory_corruption_check is
  937. on or off.
  938. config X86_RESERVE_LOW_64K
  939. bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
  940. default y
  941. help
  942. Reserve the first 64K of physical RAM on BIOSes that are known
  943. to potentially corrupt that memory range. A numbers of BIOSes are
  944. known to utilize this area during suspend/resume, so it must not
  945. be used by the kernel.
  946. Set this to N if you are absolutely sure that you trust the BIOS
  947. to get all its memory reservations and usages right.
  948. If you have doubts about the BIOS (e.g. suspend/resume does not
  949. work or there's kernel crashes after certain hardware hotplug
  950. events) and it's not AMI or Phoenix, then you might want to enable
  951. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
  952. corruption patterns.
  953. Say Y if unsure.
  954. config MATH_EMULATION
  955. bool
  956. prompt "Math emulation" if X86_32
  957. ---help---
  958. Linux can emulate a math coprocessor (used for floating point
  959. operations) if you don't have one. 486DX and Pentium processors have
  960. a math coprocessor built in, 486SX and 386 do not, unless you added
  961. a 487DX or 387, respectively. (The messages during boot time can
  962. give you some hints here ["man dmesg"].) Everyone needs either a
  963. coprocessor or this emulation.
  964. If you don't have a math coprocessor, you need to say Y here; if you
  965. say Y here even though you have a coprocessor, the coprocessor will
  966. be used nevertheless. (This behavior can be changed with the kernel
  967. command line option "no387", which comes handy if your coprocessor
  968. is broken. Try "man bootparam" or see the documentation of your boot
  969. loader (lilo or loadlin) about how to pass options to the kernel at
  970. boot time.) This means that it is a good idea to say Y here if you
  971. intend to use this kernel on different machines.
  972. More information about the internals of the Linux math coprocessor
  973. emulation can be found in <file:arch/x86/math-emu/README>.
  974. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  975. kernel, it won't hurt.
  976. config MTRR
  977. bool "MTRR (Memory Type Range Register) support"
  978. ---help---
  979. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  980. the Memory Type Range Registers (MTRRs) may be used to control
  981. processor access to memory ranges. This is most useful if you have
  982. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  983. allows bus write transfers to be combined into a larger transfer
  984. before bursting over the PCI/AGP bus. This can increase performance
  985. of image write operations 2.5 times or more. Saying Y here creates a
  986. /proc/mtrr file which may be used to manipulate your processor's
  987. MTRRs. Typically the X server should use this.
  988. This code has a reasonably generic interface so that similar
  989. control registers on other processors can be easily supported
  990. as well:
  991. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  992. Registers (ARRs) which provide a similar functionality to MTRRs. For
  993. these, the ARRs are used to emulate the MTRRs.
  994. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  995. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  996. write-combining. All of these processors are supported by this code
  997. and it makes sense to say Y here if you have one of them.
  998. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  999. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1000. can lead to all sorts of problems, so it's good to say Y here.
  1001. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1002. just add about 9 KB to your kernel.
  1003. See <file:Documentation/x86/mtrr.txt> for more information.
  1004. config MTRR_SANITIZER
  1005. def_bool y
  1006. prompt "MTRR cleanup support"
  1007. depends on MTRR
  1008. help
  1009. Convert MTRR layout from continuous to discrete, so X drivers can
  1010. add writeback entries.
  1011. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1012. The largest mtrr entry size for a continous block can be set with
  1013. mtrr_chunk_size.
  1014. If unsure, say Y.
  1015. config MTRR_SANITIZER_ENABLE_DEFAULT
  1016. int "MTRR cleanup enable value (0-1)"
  1017. range 0 1
  1018. default "0"
  1019. depends on MTRR_SANITIZER
  1020. help
  1021. Enable mtrr cleanup default value
  1022. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1023. int "MTRR cleanup spare reg num (0-7)"
  1024. range 0 7
  1025. default "1"
  1026. depends on MTRR_SANITIZER
  1027. help
  1028. mtrr cleanup spare entries default, it can be changed via
  1029. mtrr_spare_reg_nr=N on the kernel command line.
  1030. config X86_PAT
  1031. bool
  1032. prompt "x86 PAT support"
  1033. depends on MTRR
  1034. help
  1035. Use PAT attributes to setup page level cache control.
  1036. PATs are the modern equivalents of MTRRs and are much more
  1037. flexible than MTRRs.
  1038. Say N here if you see bootup problems (boot crash, boot hang,
  1039. spontaneous reboots) or a non-working video driver.
  1040. If unsure, say Y.
  1041. config EFI
  1042. bool "EFI runtime service support"
  1043. depends on ACPI
  1044. ---help---
  1045. This enables the kernel to use EFI runtime services that are
  1046. available (such as the EFI variable services).
  1047. This option is only useful on systems that have EFI firmware.
  1048. In addition, you should use the latest ELILO loader available
  1049. at <http://elilo.sourceforge.net> in order to take advantage
  1050. of EFI runtime services. However, even with this option, the
  1051. resultant kernel should continue to boot on existing non-EFI
  1052. platforms.
  1053. config SECCOMP
  1054. def_bool y
  1055. prompt "Enable seccomp to safely compute untrusted bytecode"
  1056. help
  1057. This kernel feature is useful for number crunching applications
  1058. that may need to compute untrusted bytecode during their
  1059. execution. By using pipes or other transports made available to
  1060. the process as file descriptors supporting the read/write
  1061. syscalls, it's possible to isolate those applications in
  1062. their own address space using seccomp. Once seccomp is
  1063. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1064. and the task is only allowed to execute a few safe syscalls
  1065. defined by each seccomp mode.
  1066. If unsure, say Y. Only embedded should say N here.
  1067. config CC_STACKPROTECTOR
  1068. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1069. depends on X86_64 && EXPERIMENTAL && BROKEN
  1070. help
  1071. This option turns on the -fstack-protector GCC feature. This
  1072. feature puts, at the beginning of critical functions, a canary
  1073. value on the stack just before the return address, and validates
  1074. the value just before actually returning. Stack based buffer
  1075. overflows (that need to overwrite this return address) now also
  1076. overwrite the canary, which gets detected and the attack is then
  1077. neutralized via a kernel panic.
  1078. This feature requires gcc version 4.2 or above, or a distribution
  1079. gcc with the feature backported. Older versions are automatically
  1080. detected and for those versions, this configuration option is ignored.
  1081. config CC_STACKPROTECTOR_ALL
  1082. bool "Use stack-protector for all functions"
  1083. depends on CC_STACKPROTECTOR
  1084. help
  1085. Normally, GCC only inserts the canary value protection for
  1086. functions that use large-ish on-stack buffers. By enabling
  1087. this option, GCC will be asked to do this for ALL functions.
  1088. source kernel/Kconfig.hz
  1089. config KEXEC
  1090. bool "kexec system call"
  1091. depends on X86_BIOS_REBOOT
  1092. help
  1093. kexec is a system call that implements the ability to shutdown your
  1094. current kernel, and to start another kernel. It is like a reboot
  1095. but it is independent of the system firmware. And like a reboot
  1096. you can start any kernel with it, not just Linux.
  1097. The name comes from the similarity to the exec system call.
  1098. It is an ongoing process to be certain the hardware in a machine
  1099. is properly shutdown, so do not be surprised if this code does not
  1100. initially work for you. It may help to enable device hotplugging
  1101. support. As of this writing the exact hardware interface is
  1102. strongly in flux, so no good recommendation can be made.
  1103. config CRASH_DUMP
  1104. bool "kernel crash dumps"
  1105. depends on X86_64 || (X86_32 && HIGHMEM)
  1106. help
  1107. Generate crash dump after being started by kexec.
  1108. This should be normally only set in special crash dump kernels
  1109. which are loaded in the main kernel with kexec-tools into
  1110. a specially reserved region and then later executed after
  1111. a crash by kdump/kexec. The crash dump kernel must be compiled
  1112. to a memory address not used by the main kernel or BIOS using
  1113. PHYSICAL_START, or it must be built as a relocatable image
  1114. (CONFIG_RELOCATABLE=y).
  1115. For more details see Documentation/kdump/kdump.txt
  1116. config KEXEC_JUMP
  1117. bool "kexec jump (EXPERIMENTAL)"
  1118. depends on EXPERIMENTAL
  1119. depends on KEXEC && HIBERNATION && X86_32
  1120. help
  1121. Jump between original kernel and kexeced kernel and invoke
  1122. code in physical address mode via KEXEC
  1123. config PHYSICAL_START
  1124. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  1125. default "0x1000000" if X86_NUMAQ
  1126. default "0x200000" if X86_64
  1127. default "0x100000"
  1128. help
  1129. This gives the physical address where the kernel is loaded.
  1130. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1131. bzImage will decompress itself to above physical address and
  1132. run from there. Otherwise, bzImage will run from the address where
  1133. it has been loaded by the boot loader and will ignore above physical
  1134. address.
  1135. In normal kdump cases one does not have to set/change this option
  1136. as now bzImage can be compiled as a completely relocatable image
  1137. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1138. address. This option is mainly useful for the folks who don't want
  1139. to use a bzImage for capturing the crash dump and want to use a
  1140. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1141. to be specifically compiled to run from a specific memory area
  1142. (normally a reserved region) and this option comes handy.
  1143. So if you are using bzImage for capturing the crash dump, leave
  1144. the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
  1145. Otherwise if you plan to use vmlinux for capturing the crash dump
  1146. change this value to start of the reserved region (Typically 16MB
  1147. 0x1000000). In other words, it can be set based on the "X" value as
  1148. specified in the "crashkernel=YM@XM" command line boot parameter
  1149. passed to the panic-ed kernel. Typically this parameter is set as
  1150. crashkernel=64M@16M. Please take a look at
  1151. Documentation/kdump/kdump.txt for more details about crash dumps.
  1152. Usage of bzImage for capturing the crash dump is recommended as
  1153. one does not have to build two kernels. Same kernel can be used
  1154. as production kernel and capture kernel. Above option should have
  1155. gone away after relocatable bzImage support is introduced. But it
  1156. is present because there are users out there who continue to use
  1157. vmlinux for dump capture. This option should go away down the
  1158. line.
  1159. Don't change this unless you know what you are doing.
  1160. config RELOCATABLE
  1161. bool "Build a relocatable kernel (EXPERIMENTAL)"
  1162. depends on EXPERIMENTAL
  1163. help
  1164. This builds a kernel image that retains relocation information
  1165. so it can be loaded someplace besides the default 1MB.
  1166. The relocations tend to make the kernel binary about 10% larger,
  1167. but are discarded at runtime.
  1168. One use is for the kexec on panic case where the recovery kernel
  1169. must live at a different physical address than the primary
  1170. kernel.
  1171. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1172. it has been loaded at and the compile time physical address
  1173. (CONFIG_PHYSICAL_START) is ignored.
  1174. config PHYSICAL_ALIGN
  1175. hex
  1176. prompt "Alignment value to which kernel should be aligned" if X86_32
  1177. default "0x100000" if X86_32
  1178. default "0x200000" if X86_64
  1179. range 0x2000 0x400000
  1180. help
  1181. This value puts the alignment restrictions on physical address
  1182. where kernel is loaded and run from. Kernel is compiled for an
  1183. address which meets above alignment restriction.
  1184. If bootloader loads the kernel at a non-aligned address and
  1185. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1186. address aligned to above value and run from there.
  1187. If bootloader loads the kernel at a non-aligned address and
  1188. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1189. load address and decompress itself to the address it has been
  1190. compiled for and run from there. The address for which kernel is
  1191. compiled already meets above alignment restrictions. Hence the
  1192. end result is that kernel runs from a physical address meeting
  1193. above alignment restrictions.
  1194. Don't change this unless you know what you are doing.
  1195. config HOTPLUG_CPU
  1196. bool "Support for hot-pluggable CPUs"
  1197. depends on SMP && HOTPLUG && !X86_VOYAGER
  1198. ---help---
  1199. Say Y here to allow turning CPUs off and on. CPUs can be
  1200. controlled through /sys/devices/system/cpu.
  1201. ( Note: power management support will enable this option
  1202. automatically on SMP systems. )
  1203. Say N if you want to disable CPU hotplug.
  1204. config COMPAT_VDSO
  1205. def_bool y
  1206. prompt "Compat VDSO support"
  1207. depends on X86_32 || IA32_EMULATION
  1208. help
  1209. Map the 32-bit VDSO to the predictable old-style address too.
  1210. ---help---
  1211. Say N here if you are running a sufficiently recent glibc
  1212. version (2.3.3 or later), to remove the high-mapped
  1213. VDSO mapping and to exclusively use the randomized VDSO.
  1214. If unsure, say Y.
  1215. config CMDLINE_BOOL
  1216. bool "Built-in kernel command line"
  1217. default n
  1218. help
  1219. Allow for specifying boot arguments to the kernel at
  1220. build time. On some systems (e.g. embedded ones), it is
  1221. necessary or convenient to provide some or all of the
  1222. kernel boot arguments with the kernel itself (that is,
  1223. to not rely on the boot loader to provide them.)
  1224. To compile command line arguments into the kernel,
  1225. set this option to 'Y', then fill in the
  1226. the boot arguments in CONFIG_CMDLINE.
  1227. Systems with fully functional boot loaders (i.e. non-embedded)
  1228. should leave this option set to 'N'.
  1229. config CMDLINE
  1230. string "Built-in kernel command string"
  1231. depends on CMDLINE_BOOL
  1232. default ""
  1233. help
  1234. Enter arguments here that should be compiled into the kernel
  1235. image and used at boot time. If the boot loader provides a
  1236. command line at boot time, it is appended to this string to
  1237. form the full kernel command line, when the system boots.
  1238. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1239. change this behavior.
  1240. In most cases, the command line (whether built-in or provided
  1241. by the boot loader) should specify the device for the root
  1242. file system.
  1243. config CMDLINE_OVERRIDE
  1244. bool "Built-in command line overrides boot loader arguments"
  1245. default n
  1246. depends on CMDLINE_BOOL
  1247. help
  1248. Set this option to 'Y' to have the kernel ignore the boot loader
  1249. command line, and use ONLY the built-in command line.
  1250. This is used to work around broken boot loaders. This should
  1251. be set to 'N' under normal conditions.
  1252. endmenu
  1253. config ARCH_ENABLE_MEMORY_HOTPLUG
  1254. def_bool y
  1255. depends on X86_64 || (X86_32 && HIGHMEM)
  1256. config HAVE_ARCH_EARLY_PFN_TO_NID
  1257. def_bool X86_64
  1258. depends on NUMA
  1259. menu "Power management and ACPI options"
  1260. depends on !X86_VOYAGER
  1261. config ARCH_HIBERNATION_HEADER
  1262. def_bool y
  1263. depends on X86_64 && HIBERNATION
  1264. source "kernel/power/Kconfig"
  1265. source "drivers/acpi/Kconfig"
  1266. config X86_APM_BOOT
  1267. bool
  1268. default y
  1269. depends on APM || APM_MODULE
  1270. menuconfig APM
  1271. tristate "APM (Advanced Power Management) BIOS support"
  1272. depends on X86_32 && PM_SLEEP
  1273. ---help---
  1274. APM is a BIOS specification for saving power using several different
  1275. techniques. This is mostly useful for battery powered laptops with
  1276. APM compliant BIOSes. If you say Y here, the system time will be
  1277. reset after a RESUME operation, the /proc/apm device will provide
  1278. battery status information, and user-space programs will receive
  1279. notification of APM "events" (e.g. battery status change).
  1280. If you select "Y" here, you can disable actual use of the APM
  1281. BIOS by passing the "apm=off" option to the kernel at boot time.
  1282. Note that the APM support is almost completely disabled for
  1283. machines with more than one CPU.
  1284. In order to use APM, you will need supporting software. For location
  1285. and more information, read <file:Documentation/power/pm.txt> and the
  1286. Battery Powered Linux mini-HOWTO, available from
  1287. <http://www.tldp.org/docs.html#howto>.
  1288. This driver does not spin down disk drives (see the hdparm(8)
  1289. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1290. VESA-compliant "green" monitors.
  1291. This driver does not support the TI 4000M TravelMate and the ACER
  1292. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1293. desktop machines also don't have compliant BIOSes, and this driver
  1294. may cause those machines to panic during the boot phase.
  1295. Generally, if you don't have a battery in your machine, there isn't
  1296. much point in using this driver and you should say N. If you get
  1297. random kernel OOPSes or reboots that don't seem to be related to
  1298. anything, try disabling/enabling this option (or disabling/enabling
  1299. APM in your BIOS).
  1300. Some other things you should try when experiencing seemingly random,
  1301. "weird" problems:
  1302. 1) make sure that you have enough swap space and that it is
  1303. enabled.
  1304. 2) pass the "no-hlt" option to the kernel
  1305. 3) switch on floating point emulation in the kernel and pass
  1306. the "no387" option to the kernel
  1307. 4) pass the "floppy=nodma" option to the kernel
  1308. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1309. all but the first 4 MB of RAM)
  1310. 6) make sure that the CPU is not over clocked.
  1311. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1312. 8) disable the cache from your BIOS settings
  1313. 9) install a fan for the video card or exchange video RAM
  1314. 10) install a better fan for the CPU
  1315. 11) exchange RAM chips
  1316. 12) exchange the motherboard.
  1317. To compile this driver as a module, choose M here: the
  1318. module will be called apm.
  1319. if APM
  1320. config APM_IGNORE_USER_SUSPEND
  1321. bool "Ignore USER SUSPEND"
  1322. help
  1323. This option will ignore USER SUSPEND requests. On machines with a
  1324. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1325. series notebooks, it is necessary to say Y because of a BIOS bug.
  1326. config APM_DO_ENABLE
  1327. bool "Enable PM at boot time"
  1328. ---help---
  1329. Enable APM features at boot time. From page 36 of the APM BIOS
  1330. specification: "When disabled, the APM BIOS does not automatically
  1331. power manage devices, enter the Standby State, enter the Suspend
  1332. State, or take power saving steps in response to CPU Idle calls."
  1333. This driver will make CPU Idle calls when Linux is idle (unless this
  1334. feature is turned off -- see "Do CPU IDLE calls", below). This
  1335. should always save battery power, but more complicated APM features
  1336. will be dependent on your BIOS implementation. You may need to turn
  1337. this option off if your computer hangs at boot time when using APM
  1338. support, or if it beeps continuously instead of suspending. Turn
  1339. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1340. T400CDT. This is off by default since most machines do fine without
  1341. this feature.
  1342. config APM_CPU_IDLE
  1343. bool "Make CPU Idle calls when idle"
  1344. help
  1345. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1346. On some machines, this can activate improved power savings, such as
  1347. a slowed CPU clock rate, when the machine is idle. These idle calls
  1348. are made after the idle loop has run for some length of time (e.g.,
  1349. 333 mS). On some machines, this will cause a hang at boot time or
  1350. whenever the CPU becomes idle. (On machines with more than one CPU,
  1351. this option does nothing.)
  1352. config APM_DISPLAY_BLANK
  1353. bool "Enable console blanking using APM"
  1354. help
  1355. Enable console blanking using the APM. Some laptops can use this to
  1356. turn off the LCD backlight when the screen blanker of the Linux
  1357. virtual console blanks the screen. Note that this is only used by
  1358. the virtual console screen blanker, and won't turn off the backlight
  1359. when using the X Window system. This also doesn't have anything to
  1360. do with your VESA-compliant power-saving monitor. Further, this
  1361. option doesn't work for all laptops -- it might not turn off your
  1362. backlight at all, or it might print a lot of errors to the console,
  1363. especially if you are using gpm.
  1364. config APM_ALLOW_INTS
  1365. bool "Allow interrupts during APM BIOS calls"
  1366. help
  1367. Normally we disable external interrupts while we are making calls to
  1368. the APM BIOS as a measure to lessen the effects of a badly behaving
  1369. BIOS implementation. The BIOS should reenable interrupts if it
  1370. needs to. Unfortunately, some BIOSes do not -- especially those in
  1371. many of the newer IBM Thinkpads. If you experience hangs when you
  1372. suspend, try setting this to Y. Otherwise, say N.
  1373. config APM_REAL_MODE_POWER_OFF
  1374. bool "Use real mode APM BIOS call to power off"
  1375. help
  1376. Use real mode APM BIOS calls to switch off the computer. This is
  1377. a work-around for a number of buggy BIOSes. Switch this option on if
  1378. your computer crashes instead of powering off properly.
  1379. endif # APM
  1380. source "arch/x86/kernel/cpu/cpufreq/Kconfig"
  1381. source "drivers/cpuidle/Kconfig"
  1382. source "drivers/idle/Kconfig"
  1383. endmenu
  1384. menu "Bus options (PCI etc.)"
  1385. config PCI
  1386. bool "PCI support"
  1387. default y
  1388. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1389. help
  1390. Find out whether you have a PCI motherboard. PCI is the name of a
  1391. bus system, i.e. the way the CPU talks to the other stuff inside
  1392. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1393. VESA. If you have PCI, say Y, otherwise N.
  1394. choice
  1395. prompt "PCI access mode"
  1396. depends on X86_32 && PCI
  1397. default PCI_GOANY
  1398. ---help---
  1399. On PCI systems, the BIOS can be used to detect the PCI devices and
  1400. determine their configuration. However, some old PCI motherboards
  1401. have BIOS bugs and may crash if this is done. Also, some embedded
  1402. PCI-based systems don't have any BIOS at all. Linux can also try to
  1403. detect the PCI hardware directly without using the BIOS.
  1404. With this option, you can specify how Linux should detect the
  1405. PCI devices. If you choose "BIOS", the BIOS will be used,
  1406. if you choose "Direct", the BIOS won't be used, and if you
  1407. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1408. If you choose "Any", the kernel will try MMCONFIG, then the
  1409. direct access method and falls back to the BIOS if that doesn't
  1410. work. If unsure, go with the default, which is "Any".
  1411. config PCI_GOBIOS
  1412. bool "BIOS"
  1413. config PCI_GOMMCONFIG
  1414. bool "MMConfig"
  1415. config PCI_GODIRECT
  1416. bool "Direct"
  1417. config PCI_GOOLPC
  1418. bool "OLPC"
  1419. depends on OLPC
  1420. config PCI_GOANY
  1421. bool "Any"
  1422. endchoice
  1423. config PCI_BIOS
  1424. def_bool y
  1425. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1426. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1427. config PCI_DIRECT
  1428. def_bool y
  1429. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1430. config PCI_MMCONFIG
  1431. def_bool y
  1432. depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
  1433. config PCI_OLPC
  1434. def_bool y
  1435. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1436. config PCI_DOMAINS
  1437. def_bool y
  1438. depends on PCI
  1439. config PCI_MMCONFIG
  1440. bool "Support mmconfig PCI config space access"
  1441. depends on X86_64 && PCI && ACPI
  1442. config DMAR
  1443. bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
  1444. depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
  1445. help
  1446. DMA remapping (DMAR) devices support enables independent address
  1447. translations for Direct Memory Access (DMA) from devices.
  1448. These DMA remapping devices are reported via ACPI tables
  1449. and include PCI device scope covered by these DMA
  1450. remapping devices.
  1451. config DMAR_GFX_WA
  1452. def_bool y
  1453. prompt "Support for Graphics workaround"
  1454. depends on DMAR
  1455. help
  1456. Current Graphics drivers tend to use physical address
  1457. for DMA and avoid using DMA APIs. Setting this config
  1458. option permits the IOMMU driver to set a unity map for
  1459. all the OS-visible memory. Hence the driver can continue
  1460. to use physical addresses for DMA.
  1461. config DMAR_FLOPPY_WA
  1462. def_bool y
  1463. depends on DMAR
  1464. help
  1465. Floppy disk drivers are know to bypass DMA API calls
  1466. thereby failing to work when IOMMU is enabled. This
  1467. workaround will setup a 1:1 mapping for the first
  1468. 16M to make floppy (an ISA device) work.
  1469. config INTR_REMAP
  1470. bool "Support for Interrupt Remapping (EXPERIMENTAL)"
  1471. depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
  1472. help
  1473. Supports Interrupt remapping for IO-APIC and MSI devices.
  1474. To use x2apic mode in the CPU's which support x2APIC enhancements or
  1475. to support platforms with CPU's having > 8 bit APIC ID, say Y.
  1476. source "drivers/pci/pcie/Kconfig"
  1477. source "drivers/pci/Kconfig"
  1478. # x86_64 have no ISA slots, but do have ISA-style DMA.
  1479. config ISA_DMA_API
  1480. def_bool y
  1481. if X86_32
  1482. config ISA
  1483. bool "ISA support"
  1484. depends on !X86_VOYAGER
  1485. help
  1486. Find out whether you have ISA slots on your motherboard. ISA is the
  1487. name of a bus system, i.e. the way the CPU talks to the other stuff
  1488. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1489. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1490. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1491. config EISA
  1492. bool "EISA support"
  1493. depends on ISA
  1494. ---help---
  1495. The Extended Industry Standard Architecture (EISA) bus was
  1496. developed as an open alternative to the IBM MicroChannel bus.
  1497. The EISA bus provided some of the features of the IBM MicroChannel
  1498. bus while maintaining backward compatibility with cards made for
  1499. the older ISA bus. The EISA bus saw limited use between 1988 and
  1500. 1995 when it was made obsolete by the PCI bus.
  1501. Say Y here if you are building a kernel for an EISA-based machine.
  1502. Otherwise, say N.
  1503. source "drivers/eisa/Kconfig"
  1504. config MCA
  1505. bool "MCA support" if !X86_VOYAGER
  1506. default y if X86_VOYAGER
  1507. help
  1508. MicroChannel Architecture is found in some IBM PS/2 machines and
  1509. laptops. It is a bus system similar to PCI or ISA. See
  1510. <file:Documentation/mca.txt> (and especially the web page given
  1511. there) before attempting to build an MCA bus kernel.
  1512. source "drivers/mca/Kconfig"
  1513. config SCx200
  1514. tristate "NatSemi SCx200 support"
  1515. depends on !X86_VOYAGER
  1516. help
  1517. This provides basic support for National Semiconductor's
  1518. (now AMD's) Geode processors. The driver probes for the
  1519. PCI-IDs of several on-chip devices, so its a good dependency
  1520. for other scx200_* drivers.
  1521. If compiled as a module, the driver is named scx200.
  1522. config SCx200HR_TIMER
  1523. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1524. depends on SCx200 && GENERIC_TIME
  1525. default y
  1526. help
  1527. This driver provides a clocksource built upon the on-chip
  1528. 27MHz high-resolution timer. Its also a workaround for
  1529. NSC Geode SC-1100's buggy TSC, which loses time when the
  1530. processor goes idle (as is done by the scheduler). The
  1531. other workaround is idle=poll boot option.
  1532. config GEODE_MFGPT_TIMER
  1533. def_bool y
  1534. prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
  1535. depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
  1536. help
  1537. This driver provides a clock event source based on the MFGPT
  1538. timer(s) in the CS5535 and CS5536 companion chip for the geode.
  1539. MFGPTs have a better resolution and max interval than the
  1540. generic PIT, and are suitable for use as high-res timers.
  1541. config OLPC
  1542. bool "One Laptop Per Child support"
  1543. default n
  1544. help
  1545. Add support for detecting the unique features of the OLPC
  1546. XO hardware.
  1547. endif # X86_32
  1548. config K8_NB
  1549. def_bool y
  1550. depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
  1551. source "drivers/pcmcia/Kconfig"
  1552. source "drivers/pci/hotplug/Kconfig"
  1553. endmenu
  1554. menu "Executable file formats / Emulations"
  1555. source "fs/Kconfig.binfmt"
  1556. config IA32_EMULATION
  1557. bool "IA32 Emulation"
  1558. depends on X86_64
  1559. select COMPAT_BINFMT_ELF
  1560. help
  1561. Include code to run 32-bit programs under a 64-bit kernel. You should
  1562. likely turn this on, unless you're 100% sure that you don't have any
  1563. 32-bit programs left.
  1564. config IA32_AOUT
  1565. tristate "IA32 a.out support"
  1566. depends on IA32_EMULATION
  1567. help
  1568. Support old a.out binaries in the 32bit emulation.
  1569. config COMPAT
  1570. def_bool y
  1571. depends on IA32_EMULATION
  1572. config COMPAT_FOR_U64_ALIGNMENT
  1573. def_bool COMPAT
  1574. depends on X86_64
  1575. config SYSVIPC_COMPAT
  1576. def_bool y
  1577. depends on COMPAT && SYSVIPC
  1578. endmenu
  1579. config HAVE_ATOMIC_IOMAP
  1580. def_bool y
  1581. depends on X86_32
  1582. source "net/Kconfig"
  1583. source "drivers/Kconfig"
  1584. source "drivers/firmware/Kconfig"
  1585. source "fs/Kconfig"
  1586. source "arch/x86/Kconfig.debug"
  1587. source "security/Kconfig"
  1588. source "crypto/Kconfig"
  1589. source "arch/x86/kvm/Kconfig"
  1590. source "lib/Kconfig"