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_READQ
  19. select HAVE_WRITEQ
  20. select HAVE_UNSTABLE_SCHED_CLOCK
  21. select HAVE_IDE
  22. select HAVE_OPROFILE
  23. select HAVE_IOREMAP_PROT
  24. select HAVE_KPROBES
  25. select ARCH_WANT_OPTIONAL_GPIOLIB
  26. select HAVE_KRETPROBES
  27. select HAVE_FTRACE_MCOUNT_RECORD
  28. select HAVE_DYNAMIC_FTRACE
  29. select HAVE_FUNCTION_TRACER
  30. select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
  31. select HAVE_ARCH_KGDB if !X86_VOYAGER
  32. select HAVE_ARCH_TRACEHOOK
  33. select HAVE_GENERIC_DMA_COHERENT if X86_32
  34. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  35. config ARCH_DEFCONFIG
  36. string
  37. default "arch/x86/configs/i386_defconfig" if X86_32
  38. default "arch/x86/configs/x86_64_defconfig" if X86_64
  39. config GENERIC_TIME
  40. def_bool y
  41. config GENERIC_CMOS_UPDATE
  42. def_bool y
  43. config CLOCKSOURCE_WATCHDOG
  44. def_bool y
  45. config GENERIC_CLOCKEVENTS
  46. def_bool y
  47. config GENERIC_CLOCKEVENTS_BROADCAST
  48. def_bool y
  49. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  50. config LOCKDEP_SUPPORT
  51. def_bool y
  52. config STACKTRACE_SUPPORT
  53. def_bool y
  54. config HAVE_LATENCYTOP_SUPPORT
  55. def_bool y
  56. config FAST_CMPXCHG_LOCAL
  57. bool
  58. default y
  59. config MMU
  60. def_bool y
  61. config ZONE_DMA
  62. def_bool y
  63. config SBUS
  64. bool
  65. config GENERIC_ISA_DMA
  66. def_bool y
  67. config GENERIC_IOMAP
  68. def_bool y
  69. config GENERIC_BUG
  70. def_bool y
  71. depends on BUG
  72. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  73. config GENERIC_BUG_RELATIVE_POINTERS
  74. bool
  75. config GENERIC_HWEIGHT
  76. def_bool y
  77. config GENERIC_GPIO
  78. bool
  79. config ARCH_MAY_HAVE_PC_FDC
  80. def_bool y
  81. config RWSEM_GENERIC_SPINLOCK
  82. def_bool !X86_XADD
  83. config RWSEM_XCHGADD_ALGORITHM
  84. def_bool X86_XADD
  85. config ARCH_HAS_CPU_IDLE_WAIT
  86. def_bool y
  87. config GENERIC_CALIBRATE_DELAY
  88. def_bool y
  89. config GENERIC_TIME_VSYSCALL
  90. bool
  91. default X86_64
  92. config ARCH_HAS_CPU_RELAX
  93. def_bool y
  94. config ARCH_HAS_DEFAULT_IDLE
  95. def_bool y
  96. config ARCH_HAS_CACHE_LINE_SIZE
  97. def_bool y
  98. config HAVE_SETUP_PER_CPU_AREA
  99. def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
  100. config HAVE_CPUMASK_OF_CPU_MAP
  101. def_bool X86_64_SMP
  102. config ARCH_HIBERNATION_POSSIBLE
  103. def_bool y
  104. depends on !SMP || !X86_VOYAGER
  105. config ARCH_SUSPEND_POSSIBLE
  106. def_bool y
  107. depends on !X86_VOYAGER
  108. config ZONE_DMA32
  109. bool
  110. default X86_64
  111. config ARCH_POPULATES_NODE_MAP
  112. def_bool y
  113. config AUDIT_ARCH
  114. bool
  115. default X86_64
  116. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  117. def_bool y
  118. # Use the generic interrupt handling code in kernel/irq/:
  119. config GENERIC_HARDIRQS
  120. bool
  121. default y
  122. config GENERIC_IRQ_PROBE
  123. bool
  124. default y
  125. config GENERIC_PENDING_IRQ
  126. bool
  127. depends on GENERIC_HARDIRQS && SMP
  128. default y
  129. config X86_SMP
  130. bool
  131. depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
  132. default y
  133. config USE_GENERIC_SMP_HELPERS
  134. def_bool y
  135. depends on SMP
  136. config X86_32_SMP
  137. def_bool y
  138. depends on X86_32 && SMP
  139. config X86_64_SMP
  140. def_bool y
  141. depends on X86_64 && SMP
  142. config X86_HT
  143. bool
  144. depends on SMP
  145. depends on (X86_32 && !X86_VOYAGER) || X86_64
  146. default y
  147. config X86_BIOS_REBOOT
  148. bool
  149. depends on !X86_VOYAGER
  150. default y
  151. config X86_TRAMPOLINE
  152. bool
  153. depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
  154. default y
  155. config KTIME_SCALAR
  156. def_bool X86_32
  157. source "init/Kconfig"
  158. source "kernel/Kconfig.freezer"
  159. menu "Processor type and features"
  160. source "kernel/time/Kconfig"
  161. config SMP
  162. bool "Symmetric multi-processing support"
  163. ---help---
  164. This enables support for systems with more than one CPU. If you have
  165. a system with only one CPU, like most personal computers, say N. If
  166. you have a system with more than one CPU, say Y.
  167. If you say N here, the kernel will run on single and multiprocessor
  168. machines, but will use only one CPU of a multiprocessor machine. If
  169. you say Y here, the kernel will run on many, but not all,
  170. singleprocessor machines. On a singleprocessor machine, the kernel
  171. will run faster if you say N here.
  172. Note that if you say Y here and choose architecture "586" or
  173. "Pentium" under "Processor family", the kernel will not work on 486
  174. architectures. Similarly, multiprocessor kernels for the "PPro"
  175. architecture may not work on all Pentium based boards.
  176. People using multiprocessor machines who say Y here should also say
  177. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  178. Management" code will be disabled if you say Y here.
  179. See also <file:Documentation/i386/IO-APIC.txt>,
  180. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  181. <http://www.tldp.org/docs.html#howto>.
  182. If you don't know what to do here, say N.
  183. config X86_HAS_BOOT_CPU_ID
  184. def_bool y
  185. depends on X86_VOYAGER
  186. config X86_FIND_SMP_CONFIG
  187. def_bool y
  188. depends on X86_MPPARSE || X86_VOYAGER
  189. config X86_MPPARSE
  190. bool "Enable MPS table" if ACPI
  191. default y
  192. depends on X86_LOCAL_APIC
  193. help
  194. For old smp systems that do not have proper acpi support. Newer systems
  195. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  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. source "arch/x86/Kconfig.cpu"
  366. config HPET_TIMER
  367. def_bool X86_64
  368. prompt "HPET Timer Support" if X86_32
  369. help
  370. Use the IA-PC HPET (High Precision Event Timer) to manage
  371. time in preference to the PIT and RTC, if a HPET is
  372. present.
  373. HPET is the next generation timer replacing legacy 8254s.
  374. The HPET provides a stable time base on SMP
  375. systems, unlike the TSC, but it is more expensive to access,
  376. as it is off-chip. You can find the HPET spec at
  377. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  378. You can safely choose Y here. However, HPET will only be
  379. activated if the platform and the BIOS support this feature.
  380. Otherwise the 8254 will be used for timing services.
  381. Choose N to continue using the legacy 8254 timer.
  382. config HPET_EMULATE_RTC
  383. def_bool y
  384. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  385. # Mark as embedded because too many people got it wrong.
  386. # The code disables itself when not needed.
  387. config DMI
  388. default y
  389. bool "Enable DMI scanning" if EMBEDDED
  390. help
  391. Enabled scanning of DMI to identify machine quirks. Say Y
  392. here unless you have verified that your setup is not
  393. affected by entries in the DMI blacklist. Required by PNP
  394. BIOS code.
  395. config GART_IOMMU
  396. bool "GART IOMMU support" if EMBEDDED
  397. default y
  398. select SWIOTLB
  399. select AGP
  400. depends on X86_64 && PCI
  401. help
  402. Support for full DMA access of devices with 32bit memory access only
  403. on systems with more than 3GB. This is usually needed for USB,
  404. sound, many IDE/SATA chipsets and some other devices.
  405. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  406. based hardware IOMMU and a software bounce buffer based IOMMU used
  407. on Intel systems and as fallback.
  408. The code is only active when needed (enough memory and limited
  409. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  410. too.
  411. config CALGARY_IOMMU
  412. bool "IBM Calgary IOMMU support"
  413. select SWIOTLB
  414. depends on X86_64 && PCI && EXPERIMENTAL
  415. help
  416. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  417. systems. Needed to run systems with more than 3GB of memory
  418. properly with 32-bit PCI devices that do not support DAC
  419. (Double Address Cycle). Calgary also supports bus level
  420. isolation, where all DMAs pass through the IOMMU. This
  421. prevents them from going anywhere except their intended
  422. destination. This catches hard-to-find kernel bugs and
  423. mis-behaving drivers and devices that do not use the DMA-API
  424. properly to set up their DMA buffers. The IOMMU can be
  425. turned off at boot time with the iommu=off parameter.
  426. Normally the kernel will make the right choice by itself.
  427. If unsure, say Y.
  428. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  429. def_bool y
  430. prompt "Should Calgary be enabled by default?"
  431. depends on CALGARY_IOMMU
  432. help
  433. Should Calgary be enabled by default? if you choose 'y', Calgary
  434. will be used (if it exists). If you choose 'n', Calgary will not be
  435. used even if it exists. If you choose 'n' and would like to use
  436. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  437. If unsure, say Y.
  438. config AMD_IOMMU
  439. bool "AMD IOMMU support"
  440. select SWIOTLB
  441. select PCI_MSI
  442. depends on X86_64 && PCI && ACPI
  443. help
  444. With this option you can enable support for AMD IOMMU hardware in
  445. your system. An IOMMU is a hardware component which provides
  446. remapping of DMA memory accesses from devices. With an AMD IOMMU you
  447. can isolate the the DMA memory of different devices and protect the
  448. system from misbehaving device drivers or hardware.
  449. You can find out if your system has an AMD IOMMU if you look into
  450. your BIOS for an option to enable it or if you have an IVRS ACPI
  451. table.
  452. # need this always selected by IOMMU for the VIA workaround
  453. config SWIOTLB
  454. def_bool y if X86_64
  455. help
  456. Support for software bounce buffers used on x86-64 systems
  457. which don't have a hardware IOMMU (e.g. the current generation
  458. of Intel's x86-64 CPUs). Using this PCI devices which can only
  459. access 32-bits of memory can be used on systems with more than
  460. 3 GB of memory. If unsure, say Y.
  461. config IOMMU_HELPER
  462. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  463. config MAXSMP
  464. bool "Configure Maximum number of SMP Processors and NUMA Nodes"
  465. depends on X86_64 && SMP && BROKEN
  466. default n
  467. help
  468. Configure maximum number of CPUS and NUMA Nodes for this architecture.
  469. If unsure, say N.
  470. config NR_CPUS
  471. int "Maximum number of CPUs (2-512)" if !MAXSMP
  472. range 2 512
  473. depends on SMP
  474. default "4096" if MAXSMP
  475. default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
  476. default "8"
  477. help
  478. This allows you to specify the maximum number of CPUs which this
  479. kernel will support. The maximum supported value is 512 and the
  480. minimum value which makes sense is 2.
  481. This is purely to save memory - each supported CPU adds
  482. approximately eight kilobytes to the kernel image.
  483. config SCHED_SMT
  484. bool "SMT (Hyperthreading) scheduler support"
  485. depends on X86_HT
  486. help
  487. SMT scheduler support improves the CPU scheduler's decision making
  488. when dealing with Intel Pentium 4 chips with HyperThreading at a
  489. cost of slightly increased overhead in some places. If unsure say
  490. N here.
  491. config SCHED_MC
  492. def_bool y
  493. prompt "Multi-core scheduler support"
  494. depends on X86_HT
  495. help
  496. Multi-core scheduler support improves the CPU scheduler's decision
  497. making when dealing with multi-core CPU chips at a cost of slightly
  498. increased overhead in some places. If unsure say N here.
  499. source "kernel/Kconfig.preempt"
  500. config X86_UP_APIC
  501. bool "Local APIC support on uniprocessors"
  502. depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
  503. help
  504. A local APIC (Advanced Programmable Interrupt Controller) is an
  505. integrated interrupt controller in the CPU. If you have a single-CPU
  506. system which has a processor with a local APIC, you can say Y here to
  507. enable and use it. If you say Y here even though your machine doesn't
  508. have a local APIC, then the kernel will still run with no slowdown at
  509. all. The local APIC supports CPU-generated self-interrupts (timer,
  510. performance counters), and the NMI watchdog which detects hard
  511. lockups.
  512. config X86_UP_IOAPIC
  513. bool "IO-APIC support on uniprocessors"
  514. depends on X86_UP_APIC
  515. help
  516. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  517. SMP-capable replacement for PC-style interrupt controllers. Most
  518. SMP systems and many recent uniprocessor systems have one.
  519. If you have a single-CPU system with an IO-APIC, you can say Y here
  520. to use it. If you say Y here even though your machine doesn't have
  521. an IO-APIC, then the kernel will still run with no slowdown at all.
  522. config X86_LOCAL_APIC
  523. def_bool y
  524. depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  525. config X86_IO_APIC
  526. def_bool y
  527. depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  528. config X86_VISWS_APIC
  529. def_bool y
  530. depends on X86_32 && X86_VISWS
  531. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  532. bool "Reroute for broken boot IRQs"
  533. default n
  534. depends on X86_IO_APIC
  535. help
  536. This option enables a workaround that fixes a source of
  537. spurious interrupts. This is recommended when threaded
  538. interrupt handling is used on systems where the generation of
  539. superfluous "boot interrupts" cannot be disabled.
  540. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  541. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  542. kernel does during interrupt handling). On chipsets where this
  543. boot IRQ generation cannot be disabled, this workaround keeps
  544. the original IRQ line masked so that only the equivalent "boot
  545. IRQ" is delivered to the CPUs. The workaround also tells the
  546. kernel to set up the IRQ handler on the boot IRQ line. In this
  547. way only one interrupt is delivered to the kernel. Otherwise
  548. the spurious second interrupt may cause the kernel to bring
  549. down (vital) interrupt lines.
  550. Only affects "broken" chipsets. Interrupt sharing may be
  551. increased on these systems.
  552. config X86_MCE
  553. bool "Machine Check Exception"
  554. depends on !X86_VOYAGER
  555. ---help---
  556. Machine Check Exception support allows the processor to notify the
  557. kernel if it detects a problem (e.g. overheating, component failure).
  558. The action the kernel takes depends on the severity of the problem,
  559. ranging from a warning message on the console, to halting the machine.
  560. Your processor must be a Pentium or newer to support this - check the
  561. flags in /proc/cpuinfo for mce. Note that some older Pentium systems
  562. have a design flaw which leads to false MCE events - hence MCE is
  563. disabled on all P5 processors, unless explicitly enabled with "mce"
  564. as a boot argument. Similarly, if MCE is built in and creates a
  565. problem on some new non-standard machine, you can boot with "nomce"
  566. to disable it. MCE support simply ignores non-MCE processors like
  567. the 386 and 486, so nearly everyone can say Y here.
  568. config X86_MCE_INTEL
  569. def_bool y
  570. prompt "Intel MCE features"
  571. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  572. help
  573. Additional support for intel specific MCE features such as
  574. the thermal monitor.
  575. config X86_MCE_AMD
  576. def_bool y
  577. prompt "AMD MCE features"
  578. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  579. help
  580. Additional support for AMD specific MCE features such as
  581. the DRAM Error Threshold.
  582. config X86_MCE_NONFATAL
  583. tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
  584. depends on X86_32 && X86_MCE
  585. help
  586. Enabling this feature starts a timer that triggers every 5 seconds which
  587. will look at the machine check registers to see if anything happened.
  588. Non-fatal problems automatically get corrected (but still logged).
  589. Disable this if you don't want to see these messages.
  590. Seeing the messages this option prints out may be indicative of dying
  591. or out-of-spec (ie, overclocked) hardware.
  592. This option only does something on certain CPUs.
  593. (AMD Athlon/Duron and Intel Pentium 4)
  594. config X86_MCE_P4THERMAL
  595. bool "check for P4 thermal throttling interrupt."
  596. depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
  597. help
  598. Enabling this feature will cause a message to be printed when the P4
  599. enters thermal throttling.
  600. config VM86
  601. bool "Enable VM86 support" if EMBEDDED
  602. default y
  603. depends on X86_32
  604. help
  605. This option is required by programs like DOSEMU to run 16-bit legacy
  606. code on X86 processors. It also may be needed by software like
  607. XFree86 to initialize some video cards via BIOS. Disabling this
  608. option saves about 6k.
  609. config TOSHIBA
  610. tristate "Toshiba Laptop support"
  611. depends on X86_32
  612. ---help---
  613. This adds a driver to safely access the System Management Mode of
  614. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  615. not work on models with a Phoenix BIOS. The System Management Mode
  616. is used to set the BIOS and power saving options on Toshiba portables.
  617. For information on utilities to make use of this driver see the
  618. Toshiba Linux utilities web site at:
  619. <http://www.buzzard.org.uk/toshiba/>.
  620. Say Y if you intend to run this kernel on a Toshiba portable.
  621. Say N otherwise.
  622. config I8K
  623. tristate "Dell laptop support"
  624. ---help---
  625. This adds a driver to safely access the System Management Mode
  626. of the CPU on the Dell Inspiron 8000. The System Management Mode
  627. is used to read cpu temperature and cooling fan status and to
  628. control the fans on the I8K portables.
  629. This driver has been tested only on the Inspiron 8000 but it may
  630. also work with other Dell laptops. You can force loading on other
  631. models by passing the parameter `force=1' to the module. Use at
  632. your own risk.
  633. For information on utilities to make use of this driver see the
  634. I8K Linux utilities web site at:
  635. <http://people.debian.org/~dz/i8k/>
  636. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  637. Say N otherwise.
  638. config X86_REBOOTFIXUPS
  639. bool "Enable X86 board specific fixups for reboot"
  640. depends on X86_32
  641. ---help---
  642. This enables chipset and/or board specific fixups to be done
  643. in order to get reboot to work correctly. This is only needed on
  644. some combinations of hardware and BIOS. The symptom, for which
  645. this config is intended, is when reboot ends with a stalled/hung
  646. system.
  647. Currently, the only fixup is for the Geode machines using
  648. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  649. Say Y if you want to enable the fixup. Currently, it's safe to
  650. enable this option even if you don't need it.
  651. Say N otherwise.
  652. config MICROCODE
  653. tristate "/dev/cpu/microcode - microcode support"
  654. select FW_LOADER
  655. ---help---
  656. If you say Y here, you will be able to update the microcode on
  657. certain Intel and AMD processors. The Intel support is for the
  658. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  659. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  660. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  661. You will obviously need the actual microcode binary data itself
  662. which is not shipped with the Linux kernel.
  663. This option selects the general module only, you need to select
  664. at least one vendor specific module as well.
  665. To compile this driver as a module, choose M here: the
  666. module will be called microcode.
  667. config MICROCODE_INTEL
  668. bool "Intel microcode patch loading support"
  669. depends on MICROCODE
  670. default MICROCODE
  671. select FW_LOADER
  672. --help---
  673. This options enables microcode patch loading support for Intel
  674. processors.
  675. For latest news and information on obtaining all the required
  676. Intel ingredients for this driver, check:
  677. <http://www.urbanmyth.org/microcode/>.
  678. config MICROCODE_AMD
  679. bool "AMD microcode patch loading support"
  680. depends on MICROCODE
  681. select FW_LOADER
  682. --help---
  683. If you select this option, microcode patch loading support for AMD
  684. processors will be enabled.
  685. config MICROCODE_OLD_INTERFACE
  686. def_bool y
  687. depends on MICROCODE
  688. config X86_MSR
  689. tristate "/dev/cpu/*/msr - Model-specific register support"
  690. help
  691. This device gives privileged processes access to the x86
  692. Model-Specific Registers (MSRs). It is a character device with
  693. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  694. MSR accesses are directed to a specific CPU on multi-processor
  695. systems.
  696. config X86_CPUID
  697. tristate "/dev/cpu/*/cpuid - CPU information support"
  698. help
  699. This device gives processes access to the x86 CPUID instruction to
  700. be executed on a specific processor. It is a character device
  701. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  702. /dev/cpu/31/cpuid.
  703. choice
  704. prompt "High Memory Support"
  705. default HIGHMEM4G if !X86_NUMAQ
  706. default HIGHMEM64G if X86_NUMAQ
  707. depends on X86_32
  708. config NOHIGHMEM
  709. bool "off"
  710. depends on !X86_NUMAQ
  711. ---help---
  712. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  713. However, the address space of 32-bit x86 processors is only 4
  714. Gigabytes large. That means that, if you have a large amount of
  715. physical memory, not all of it can be "permanently mapped" by the
  716. kernel. The physical memory that's not permanently mapped is called
  717. "high memory".
  718. If you are compiling a kernel which will never run on a machine with
  719. more than 1 Gigabyte total physical RAM, answer "off" here (default
  720. choice and suitable for most users). This will result in a "3GB/1GB"
  721. split: 3GB are mapped so that each process sees a 3GB virtual memory
  722. space and the remaining part of the 4GB virtual memory space is used
  723. by the kernel to permanently map as much physical memory as
  724. possible.
  725. If the machine has between 1 and 4 Gigabytes physical RAM, then
  726. answer "4GB" here.
  727. If more than 4 Gigabytes is used then answer "64GB" here. This
  728. selection turns Intel PAE (Physical Address Extension) mode on.
  729. PAE implements 3-level paging on IA32 processors. PAE is fully
  730. supported by Linux, PAE mode is implemented on all recent Intel
  731. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  732. then the kernel will not boot on CPUs that don't support PAE!
  733. The actual amount of total physical memory will either be
  734. auto detected or can be forced by using a kernel command line option
  735. such as "mem=256M". (Try "man bootparam" or see the documentation of
  736. your boot loader (lilo or loadlin) about how to pass options to the
  737. kernel at boot time.)
  738. If unsure, say "off".
  739. config HIGHMEM4G
  740. bool "4GB"
  741. depends on !X86_NUMAQ
  742. help
  743. Select this if you have a 32-bit processor and between 1 and 4
  744. gigabytes of physical RAM.
  745. config HIGHMEM64G
  746. bool "64GB"
  747. depends on !M386 && !M486
  748. select X86_PAE
  749. help
  750. Select this if you have a 32-bit processor and more than 4
  751. gigabytes of physical RAM.
  752. endchoice
  753. choice
  754. depends on EXPERIMENTAL
  755. prompt "Memory split" if EMBEDDED
  756. default VMSPLIT_3G
  757. depends on X86_32
  758. help
  759. Select the desired split between kernel and user memory.
  760. If the address range available to the kernel is less than the
  761. physical memory installed, the remaining memory will be available
  762. as "high memory". Accessing high memory is a little more costly
  763. than low memory, as it needs to be mapped into the kernel first.
  764. Note that increasing the kernel address space limits the range
  765. available to user programs, making the address space there
  766. tighter. Selecting anything other than the default 3G/1G split
  767. will also likely make your kernel incompatible with binary-only
  768. kernel modules.
  769. If you are not absolutely sure what you are doing, leave this
  770. option alone!
  771. config VMSPLIT_3G
  772. bool "3G/1G user/kernel split"
  773. config VMSPLIT_3G_OPT
  774. depends on !X86_PAE
  775. bool "3G/1G user/kernel split (for full 1G low memory)"
  776. config VMSPLIT_2G
  777. bool "2G/2G user/kernel split"
  778. config VMSPLIT_2G_OPT
  779. depends on !X86_PAE
  780. bool "2G/2G user/kernel split (for full 2G low memory)"
  781. config VMSPLIT_1G
  782. bool "1G/3G user/kernel split"
  783. endchoice
  784. config PAGE_OFFSET
  785. hex
  786. default 0xB0000000 if VMSPLIT_3G_OPT
  787. default 0x80000000 if VMSPLIT_2G
  788. default 0x78000000 if VMSPLIT_2G_OPT
  789. default 0x40000000 if VMSPLIT_1G
  790. default 0xC0000000
  791. depends on X86_32
  792. config HIGHMEM
  793. def_bool y
  794. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  795. config X86_PAE
  796. bool "PAE (Physical Address Extension) Support"
  797. depends on X86_32 && !HIGHMEM4G
  798. help
  799. PAE is required for NX support, and furthermore enables
  800. larger swapspace support for non-overcommit purposes. It
  801. has the cost of more pagetable lookup overhead, and also
  802. consumes more pagetable space per process.
  803. config ARCH_PHYS_ADDR_T_64BIT
  804. def_bool X86_64 || X86_PAE
  805. config DIRECT_GBPAGES
  806. bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
  807. default y
  808. depends on X86_64
  809. help
  810. Allow the kernel linear mapping to use 1GB pages on CPUs that
  811. support it. This can improve the kernel's performance a tiny bit by
  812. reducing TLB pressure. If in doubt, say "Y".
  813. # Common NUMA Features
  814. config NUMA
  815. bool "Numa Memory Allocation and Scheduler Support"
  816. depends on SMP
  817. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  818. default n if X86_PC
  819. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  820. help
  821. Enable NUMA (Non Uniform Memory Access) support.
  822. The kernel will try to allocate memory used by a CPU on the
  823. local memory controller of the CPU and add some more
  824. NUMA awareness to the kernel.
  825. For 64-bit this is recommended if the system is Intel Core i7
  826. (or later), AMD Opteron, or EM64T NUMA.
  827. For 32-bit this is only needed on (rare) 32-bit-only platforms
  828. that support NUMA topologies, such as NUMAQ / Summit, or if you
  829. boot a 32-bit kernel on a 64-bit NUMA platform.
  830. Otherwise, you should say N.
  831. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  832. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  833. config K8_NUMA
  834. def_bool y
  835. prompt "Old style AMD Opteron NUMA detection"
  836. depends on X86_64 && NUMA && PCI
  837. help
  838. Enable K8 NUMA node topology detection. You should say Y here if
  839. you have a multi processor AMD K8 system. This uses an old
  840. method to read the NUMA configuration directly from the builtin
  841. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  842. instead, which also takes priority if both are compiled in.
  843. config X86_64_ACPI_NUMA
  844. def_bool y
  845. prompt "ACPI NUMA detection"
  846. depends on X86_64 && NUMA && ACPI && PCI
  847. select ACPI_NUMA
  848. help
  849. Enable ACPI SRAT based node topology detection.
  850. # Some NUMA nodes have memory ranges that span
  851. # other nodes. Even though a pfn is valid and
  852. # between a node's start and end pfns, it may not
  853. # reside on that node. See memmap_init_zone()
  854. # for details.
  855. config NODES_SPAN_OTHER_NODES
  856. def_bool y
  857. depends on X86_64_ACPI_NUMA
  858. config NUMA_EMU
  859. bool "NUMA emulation"
  860. depends on X86_64 && NUMA
  861. help
  862. Enable NUMA emulation. A flat machine will be split
  863. into virtual nodes when booted with "numa=fake=N", where N is the
  864. number of nodes. This is only useful for debugging.
  865. config NODES_SHIFT
  866. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  867. range 1 9 if X86_64
  868. default "9" if MAXSMP
  869. default "6" if X86_64
  870. default "4" if X86_NUMAQ
  871. default "3"
  872. depends on NEED_MULTIPLE_NODES
  873. help
  874. Specify the maximum number of NUMA Nodes available on the target
  875. system. Increases memory reserved to accomodate various tables.
  876. config HAVE_ARCH_BOOTMEM_NODE
  877. def_bool y
  878. depends on X86_32 && NUMA
  879. config ARCH_HAVE_MEMORY_PRESENT
  880. def_bool y
  881. depends on X86_32 && DISCONTIGMEM
  882. config NEED_NODE_MEMMAP_SIZE
  883. def_bool y
  884. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  885. config HAVE_ARCH_ALLOC_REMAP
  886. def_bool y
  887. depends on X86_32 && NUMA
  888. config ARCH_FLATMEM_ENABLE
  889. def_bool y
  890. depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
  891. config ARCH_DISCONTIGMEM_ENABLE
  892. def_bool y
  893. depends on NUMA && X86_32
  894. config ARCH_DISCONTIGMEM_DEFAULT
  895. def_bool y
  896. depends on NUMA && X86_32
  897. config ARCH_SPARSEMEM_DEFAULT
  898. def_bool y
  899. depends on X86_64
  900. config ARCH_SPARSEMEM_ENABLE
  901. def_bool y
  902. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_GENERICARCH
  903. select SPARSEMEM_STATIC if X86_32
  904. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  905. config ARCH_SELECT_MEMORY_MODEL
  906. def_bool y
  907. depends on ARCH_SPARSEMEM_ENABLE
  908. config ARCH_MEMORY_PROBE
  909. def_bool X86_64
  910. depends on MEMORY_HOTPLUG
  911. source "mm/Kconfig"
  912. config HIGHPTE
  913. bool "Allocate 3rd-level pagetables from highmem"
  914. depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
  915. help
  916. The VM uses one page table entry for each page of physical memory.
  917. For systems with a lot of RAM, this can be wasteful of precious
  918. low memory. Setting this option will put user-space page table
  919. entries in high memory.
  920. config X86_CHECK_BIOS_CORRUPTION
  921. bool "Check for low memory corruption"
  922. help
  923. Periodically check for memory corruption in low memory, which
  924. is suspected to be caused by BIOS. Even when enabled in the
  925. configuration, it is disabled at runtime. Enable it by
  926. setting "memory_corruption_check=1" on the kernel command
  927. line. By default it scans the low 64k of memory every 60
  928. seconds; see the memory_corruption_check_size and
  929. memory_corruption_check_period parameters in
  930. Documentation/kernel-parameters.txt to adjust this.
  931. When enabled with the default parameters, this option has
  932. almost no overhead, as it reserves a relatively small amount
  933. of memory and scans it infrequently. It both detects corruption
  934. and prevents it from affecting the running system.
  935. It is, however, intended as a diagnostic tool; if repeatable
  936. BIOS-originated corruption always affects the same memory,
  937. you can use memmap= to prevent the kernel from using that
  938. memory.
  939. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  940. bool "Set the default setting of memory_corruption_check"
  941. depends on X86_CHECK_BIOS_CORRUPTION
  942. default y
  943. help
  944. Set whether the default state of memory_corruption_check is
  945. on or off.
  946. config X86_RESERVE_LOW_64K
  947. bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
  948. default y
  949. help
  950. Reserve the first 64K of physical RAM on BIOSes that are known
  951. to potentially corrupt that memory range. A numbers of BIOSes are
  952. known to utilize this area during suspend/resume, so it must not
  953. be used by the kernel.
  954. Set this to N if you are absolutely sure that you trust the BIOS
  955. to get all its memory reservations and usages right.
  956. If you have doubts about the BIOS (e.g. suspend/resume does not
  957. work or there's kernel crashes after certain hardware hotplug
  958. events) and it's not AMI or Phoenix, then you might want to enable
  959. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
  960. corruption patterns.
  961. Say Y if unsure.
  962. config MATH_EMULATION
  963. bool
  964. prompt "Math emulation" if X86_32
  965. ---help---
  966. Linux can emulate a math coprocessor (used for floating point
  967. operations) if you don't have one. 486DX and Pentium processors have
  968. a math coprocessor built in, 486SX and 386 do not, unless you added
  969. a 487DX or 387, respectively. (The messages during boot time can
  970. give you some hints here ["man dmesg"].) Everyone needs either a
  971. coprocessor or this emulation.
  972. If you don't have a math coprocessor, you need to say Y here; if you
  973. say Y here even though you have a coprocessor, the coprocessor will
  974. be used nevertheless. (This behavior can be changed with the kernel
  975. command line option "no387", which comes handy if your coprocessor
  976. is broken. Try "man bootparam" or see the documentation of your boot
  977. loader (lilo or loadlin) about how to pass options to the kernel at
  978. boot time.) This means that it is a good idea to say Y here if you
  979. intend to use this kernel on different machines.
  980. More information about the internals of the Linux math coprocessor
  981. emulation can be found in <file:arch/x86/math-emu/README>.
  982. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  983. kernel, it won't hurt.
  984. config MTRR
  985. bool "MTRR (Memory Type Range Register) support"
  986. ---help---
  987. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  988. the Memory Type Range Registers (MTRRs) may be used to control
  989. processor access to memory ranges. This is most useful if you have
  990. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  991. allows bus write transfers to be combined into a larger transfer
  992. before bursting over the PCI/AGP bus. This can increase performance
  993. of image write operations 2.5 times or more. Saying Y here creates a
  994. /proc/mtrr file which may be used to manipulate your processor's
  995. MTRRs. Typically the X server should use this.
  996. This code has a reasonably generic interface so that similar
  997. control registers on other processors can be easily supported
  998. as well:
  999. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1000. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1001. these, the ARRs are used to emulate the MTRRs.
  1002. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1003. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1004. write-combining. All of these processors are supported by this code
  1005. and it makes sense to say Y here if you have one of them.
  1006. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1007. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1008. can lead to all sorts of problems, so it's good to say Y here.
  1009. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1010. just add about 9 KB to your kernel.
  1011. See <file:Documentation/x86/mtrr.txt> for more information.
  1012. config MTRR_SANITIZER
  1013. def_bool y
  1014. prompt "MTRR cleanup support"
  1015. depends on MTRR
  1016. help
  1017. Convert MTRR layout from continuous to discrete, so X drivers can
  1018. add writeback entries.
  1019. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1020. The largest mtrr entry size for a continous block can be set with
  1021. mtrr_chunk_size.
  1022. If unsure, say Y.
  1023. config MTRR_SANITIZER_ENABLE_DEFAULT
  1024. int "MTRR cleanup enable value (0-1)"
  1025. range 0 1
  1026. default "0"
  1027. depends on MTRR_SANITIZER
  1028. help
  1029. Enable mtrr cleanup default value
  1030. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1031. int "MTRR cleanup spare reg num (0-7)"
  1032. range 0 7
  1033. default "1"
  1034. depends on MTRR_SANITIZER
  1035. help
  1036. mtrr cleanup spare entries default, it can be changed via
  1037. mtrr_spare_reg_nr=N on the kernel command line.
  1038. config X86_PAT
  1039. bool
  1040. prompt "x86 PAT support"
  1041. depends on MTRR
  1042. help
  1043. Use PAT attributes to setup page level cache control.
  1044. PATs are the modern equivalents of MTRRs and are much more
  1045. flexible than MTRRs.
  1046. Say N here if you see bootup problems (boot crash, boot hang,
  1047. spontaneous reboots) or a non-working video driver.
  1048. If unsure, say Y.
  1049. config EFI
  1050. bool "EFI runtime service support"
  1051. depends on ACPI
  1052. ---help---
  1053. This enables the kernel to use EFI runtime services that are
  1054. available (such as the EFI variable services).
  1055. This option is only useful on systems that have EFI firmware.
  1056. In addition, you should use the latest ELILO loader available
  1057. at <http://elilo.sourceforge.net> in order to take advantage
  1058. of EFI runtime services. However, even with this option, the
  1059. resultant kernel should continue to boot on existing non-EFI
  1060. platforms.
  1061. config SECCOMP
  1062. def_bool y
  1063. prompt "Enable seccomp to safely compute untrusted bytecode"
  1064. help
  1065. This kernel feature is useful for number crunching applications
  1066. that may need to compute untrusted bytecode during their
  1067. execution. By using pipes or other transports made available to
  1068. the process as file descriptors supporting the read/write
  1069. syscalls, it's possible to isolate those applications in
  1070. their own address space using seccomp. Once seccomp is
  1071. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1072. and the task is only allowed to execute a few safe syscalls
  1073. defined by each seccomp mode.
  1074. If unsure, say Y. Only embedded should say N here.
  1075. config CC_STACKPROTECTOR
  1076. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1077. depends on X86_64 && EXPERIMENTAL && BROKEN
  1078. help
  1079. This option turns on the -fstack-protector GCC feature. This
  1080. feature puts, at the beginning of critical functions, a canary
  1081. value on the stack just before the return address, and validates
  1082. the value just before actually returning. Stack based buffer
  1083. overflows (that need to overwrite this return address) now also
  1084. overwrite the canary, which gets detected and the attack is then
  1085. neutralized via a kernel panic.
  1086. This feature requires gcc version 4.2 or above, or a distribution
  1087. gcc with the feature backported. Older versions are automatically
  1088. detected and for those versions, this configuration option is ignored.
  1089. config CC_STACKPROTECTOR_ALL
  1090. bool "Use stack-protector for all functions"
  1091. depends on CC_STACKPROTECTOR
  1092. help
  1093. Normally, GCC only inserts the canary value protection for
  1094. functions that use large-ish on-stack buffers. By enabling
  1095. this option, GCC will be asked to do this for ALL functions.
  1096. source kernel/Kconfig.hz
  1097. config KEXEC
  1098. bool "kexec system call"
  1099. depends on X86_BIOS_REBOOT
  1100. help
  1101. kexec is a system call that implements the ability to shutdown your
  1102. current kernel, and to start another kernel. It is like a reboot
  1103. but it is independent of the system firmware. And like a reboot
  1104. you can start any kernel with it, not just Linux.
  1105. The name comes from the similarity to the exec system call.
  1106. It is an ongoing process to be certain the hardware in a machine
  1107. is properly shutdown, so do not be surprised if this code does not
  1108. initially work for you. It may help to enable device hotplugging
  1109. support. As of this writing the exact hardware interface is
  1110. strongly in flux, so no good recommendation can be made.
  1111. config CRASH_DUMP
  1112. bool "kernel crash dumps"
  1113. depends on X86_64 || (X86_32 && HIGHMEM)
  1114. help
  1115. Generate crash dump after being started by kexec.
  1116. This should be normally only set in special crash dump kernels
  1117. which are loaded in the main kernel with kexec-tools into
  1118. a specially reserved region and then later executed after
  1119. a crash by kdump/kexec. The crash dump kernel must be compiled
  1120. to a memory address not used by the main kernel or BIOS using
  1121. PHYSICAL_START, or it must be built as a relocatable image
  1122. (CONFIG_RELOCATABLE=y).
  1123. For more details see Documentation/kdump/kdump.txt
  1124. config KEXEC_JUMP
  1125. bool "kexec jump (EXPERIMENTAL)"
  1126. depends on EXPERIMENTAL
  1127. depends on KEXEC && HIBERNATION && X86_32
  1128. help
  1129. Jump between original kernel and kexeced kernel and invoke
  1130. code in physical address mode via KEXEC
  1131. config PHYSICAL_START
  1132. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  1133. default "0x1000000" if X86_NUMAQ
  1134. default "0x200000" if X86_64
  1135. default "0x100000"
  1136. help
  1137. This gives the physical address where the kernel is loaded.
  1138. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1139. bzImage will decompress itself to above physical address and
  1140. run from there. Otherwise, bzImage will run from the address where
  1141. it has been loaded by the boot loader and will ignore above physical
  1142. address.
  1143. In normal kdump cases one does not have to set/change this option
  1144. as now bzImage can be compiled as a completely relocatable image
  1145. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1146. address. This option is mainly useful for the folks who don't want
  1147. to use a bzImage for capturing the crash dump and want to use a
  1148. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1149. to be specifically compiled to run from a specific memory area
  1150. (normally a reserved region) and this option comes handy.
  1151. So if you are using bzImage for capturing the crash dump, leave
  1152. the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
  1153. Otherwise if you plan to use vmlinux for capturing the crash dump
  1154. change this value to start of the reserved region (Typically 16MB
  1155. 0x1000000). In other words, it can be set based on the "X" value as
  1156. specified in the "crashkernel=YM@XM" command line boot parameter
  1157. passed to the panic-ed kernel. Typically this parameter is set as
  1158. crashkernel=64M@16M. Please take a look at
  1159. Documentation/kdump/kdump.txt for more details about crash dumps.
  1160. Usage of bzImage for capturing the crash dump is recommended as
  1161. one does not have to build two kernels. Same kernel can be used
  1162. as production kernel and capture kernel. Above option should have
  1163. gone away after relocatable bzImage support is introduced. But it
  1164. is present because there are users out there who continue to use
  1165. vmlinux for dump capture. This option should go away down the
  1166. line.
  1167. Don't change this unless you know what you are doing.
  1168. config RELOCATABLE
  1169. bool "Build a relocatable kernel (EXPERIMENTAL)"
  1170. depends on EXPERIMENTAL
  1171. help
  1172. This builds a kernel image that retains relocation information
  1173. so it can be loaded someplace besides the default 1MB.
  1174. The relocations tend to make the kernel binary about 10% larger,
  1175. but are discarded at runtime.
  1176. One use is for the kexec on panic case where the recovery kernel
  1177. must live at a different physical address than the primary
  1178. kernel.
  1179. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1180. it has been loaded at and the compile time physical address
  1181. (CONFIG_PHYSICAL_START) is ignored.
  1182. config PHYSICAL_ALIGN
  1183. hex
  1184. prompt "Alignment value to which kernel should be aligned" if X86_32
  1185. default "0x100000" if X86_32
  1186. default "0x200000" if X86_64
  1187. range 0x2000 0x400000
  1188. help
  1189. This value puts the alignment restrictions on physical address
  1190. where kernel is loaded and run from. Kernel is compiled for an
  1191. address which meets above alignment restriction.
  1192. If bootloader loads the kernel at a non-aligned address and
  1193. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1194. address aligned to above value and run from there.
  1195. If bootloader loads the kernel at a non-aligned address and
  1196. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1197. load address and decompress itself to the address it has been
  1198. compiled for and run from there. The address for which kernel is
  1199. compiled already meets above alignment restrictions. Hence the
  1200. end result is that kernel runs from a physical address meeting
  1201. above alignment restrictions.
  1202. Don't change this unless you know what you are doing.
  1203. config HOTPLUG_CPU
  1204. bool "Support for hot-pluggable CPUs"
  1205. depends on SMP && HOTPLUG && !X86_VOYAGER
  1206. ---help---
  1207. Say Y here to allow turning CPUs off and on. CPUs can be
  1208. controlled through /sys/devices/system/cpu.
  1209. ( Note: power management support will enable this option
  1210. automatically on SMP systems. )
  1211. Say N if you want to disable CPU hotplug.
  1212. config COMPAT_VDSO
  1213. def_bool y
  1214. prompt "Compat VDSO support"
  1215. depends on X86_32 || IA32_EMULATION
  1216. help
  1217. Map the 32-bit VDSO to the predictable old-style address too.
  1218. ---help---
  1219. Say N here if you are running a sufficiently recent glibc
  1220. version (2.3.3 or later), to remove the high-mapped
  1221. VDSO mapping and to exclusively use the randomized VDSO.
  1222. If unsure, say Y.
  1223. config CMDLINE_BOOL
  1224. bool "Built-in kernel command line"
  1225. default n
  1226. help
  1227. Allow for specifying boot arguments to the kernel at
  1228. build time. On some systems (e.g. embedded ones), it is
  1229. necessary or convenient to provide some or all of the
  1230. kernel boot arguments with the kernel itself (that is,
  1231. to not rely on the boot loader to provide them.)
  1232. To compile command line arguments into the kernel,
  1233. set this option to 'Y', then fill in the
  1234. the boot arguments in CONFIG_CMDLINE.
  1235. Systems with fully functional boot loaders (i.e. non-embedded)
  1236. should leave this option set to 'N'.
  1237. config CMDLINE
  1238. string "Built-in kernel command string"
  1239. depends on CMDLINE_BOOL
  1240. default ""
  1241. help
  1242. Enter arguments here that should be compiled into the kernel
  1243. image and used at boot time. If the boot loader provides a
  1244. command line at boot time, it is appended to this string to
  1245. form the full kernel command line, when the system boots.
  1246. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1247. change this behavior.
  1248. In most cases, the command line (whether built-in or provided
  1249. by the boot loader) should specify the device for the root
  1250. file system.
  1251. config CMDLINE_OVERRIDE
  1252. bool "Built-in command line overrides boot loader arguments"
  1253. default n
  1254. depends on CMDLINE_BOOL
  1255. help
  1256. Set this option to 'Y' to have the kernel ignore the boot loader
  1257. command line, and use ONLY the built-in command line.
  1258. This is used to work around broken boot loaders. This should
  1259. be set to 'N' under normal conditions.
  1260. endmenu
  1261. config ARCH_ENABLE_MEMORY_HOTPLUG
  1262. def_bool y
  1263. depends on X86_64 || (X86_32 && HIGHMEM)
  1264. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1265. def_bool y
  1266. depends on MEMORY_HOTPLUG
  1267. config HAVE_ARCH_EARLY_PFN_TO_NID
  1268. def_bool X86_64
  1269. depends on NUMA
  1270. menu "Power management and ACPI options"
  1271. depends on !X86_VOYAGER
  1272. config ARCH_HIBERNATION_HEADER
  1273. def_bool y
  1274. depends on X86_64 && HIBERNATION
  1275. source "kernel/power/Kconfig"
  1276. source "drivers/acpi/Kconfig"
  1277. config X86_APM_BOOT
  1278. bool
  1279. default y
  1280. depends on APM || APM_MODULE
  1281. menuconfig APM
  1282. tristate "APM (Advanced Power Management) BIOS support"
  1283. depends on X86_32 && PM_SLEEP
  1284. ---help---
  1285. APM is a BIOS specification for saving power using several different
  1286. techniques. This is mostly useful for battery powered laptops with
  1287. APM compliant BIOSes. If you say Y here, the system time will be
  1288. reset after a RESUME operation, the /proc/apm device will provide
  1289. battery status information, and user-space programs will receive
  1290. notification of APM "events" (e.g. battery status change).
  1291. If you select "Y" here, you can disable actual use of the APM
  1292. BIOS by passing the "apm=off" option to the kernel at boot time.
  1293. Note that the APM support is almost completely disabled for
  1294. machines with more than one CPU.
  1295. In order to use APM, you will need supporting software. For location
  1296. and more information, read <file:Documentation/power/pm.txt> and the
  1297. Battery Powered Linux mini-HOWTO, available from
  1298. <http://www.tldp.org/docs.html#howto>.
  1299. This driver does not spin down disk drives (see the hdparm(8)
  1300. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1301. VESA-compliant "green" monitors.
  1302. This driver does not support the TI 4000M TravelMate and the ACER
  1303. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1304. desktop machines also don't have compliant BIOSes, and this driver
  1305. may cause those machines to panic during the boot phase.
  1306. Generally, if you don't have a battery in your machine, there isn't
  1307. much point in using this driver and you should say N. If you get
  1308. random kernel OOPSes or reboots that don't seem to be related to
  1309. anything, try disabling/enabling this option (or disabling/enabling
  1310. APM in your BIOS).
  1311. Some other things you should try when experiencing seemingly random,
  1312. "weird" problems:
  1313. 1) make sure that you have enough swap space and that it is
  1314. enabled.
  1315. 2) pass the "no-hlt" option to the kernel
  1316. 3) switch on floating point emulation in the kernel and pass
  1317. the "no387" option to the kernel
  1318. 4) pass the "floppy=nodma" option to the kernel
  1319. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1320. all but the first 4 MB of RAM)
  1321. 6) make sure that the CPU is not over clocked.
  1322. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1323. 8) disable the cache from your BIOS settings
  1324. 9) install a fan for the video card or exchange video RAM
  1325. 10) install a better fan for the CPU
  1326. 11) exchange RAM chips
  1327. 12) exchange the motherboard.
  1328. To compile this driver as a module, choose M here: the
  1329. module will be called apm.
  1330. if APM
  1331. config APM_IGNORE_USER_SUSPEND
  1332. bool "Ignore USER SUSPEND"
  1333. help
  1334. This option will ignore USER SUSPEND requests. On machines with a
  1335. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1336. series notebooks, it is necessary to say Y because of a BIOS bug.
  1337. config APM_DO_ENABLE
  1338. bool "Enable PM at boot time"
  1339. ---help---
  1340. Enable APM features at boot time. From page 36 of the APM BIOS
  1341. specification: "When disabled, the APM BIOS does not automatically
  1342. power manage devices, enter the Standby State, enter the Suspend
  1343. State, or take power saving steps in response to CPU Idle calls."
  1344. This driver will make CPU Idle calls when Linux is idle (unless this
  1345. feature is turned off -- see "Do CPU IDLE calls", below). This
  1346. should always save battery power, but more complicated APM features
  1347. will be dependent on your BIOS implementation. You may need to turn
  1348. this option off if your computer hangs at boot time when using APM
  1349. support, or if it beeps continuously instead of suspending. Turn
  1350. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1351. T400CDT. This is off by default since most machines do fine without
  1352. this feature.
  1353. config APM_CPU_IDLE
  1354. bool "Make CPU Idle calls when idle"
  1355. help
  1356. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1357. On some machines, this can activate improved power savings, such as
  1358. a slowed CPU clock rate, when the machine is idle. These idle calls
  1359. are made after the idle loop has run for some length of time (e.g.,
  1360. 333 mS). On some machines, this will cause a hang at boot time or
  1361. whenever the CPU becomes idle. (On machines with more than one CPU,
  1362. this option does nothing.)
  1363. config APM_DISPLAY_BLANK
  1364. bool "Enable console blanking using APM"
  1365. help
  1366. Enable console blanking using the APM. Some laptops can use this to
  1367. turn off the LCD backlight when the screen blanker of the Linux
  1368. virtual console blanks the screen. Note that this is only used by
  1369. the virtual console screen blanker, and won't turn off the backlight
  1370. when using the X Window system. This also doesn't have anything to
  1371. do with your VESA-compliant power-saving monitor. Further, this
  1372. option doesn't work for all laptops -- it might not turn off your
  1373. backlight at all, or it might print a lot of errors to the console,
  1374. especially if you are using gpm.
  1375. config APM_ALLOW_INTS
  1376. bool "Allow interrupts during APM BIOS calls"
  1377. help
  1378. Normally we disable external interrupts while we are making calls to
  1379. the APM BIOS as a measure to lessen the effects of a badly behaving
  1380. BIOS implementation. The BIOS should reenable interrupts if it
  1381. needs to. Unfortunately, some BIOSes do not -- especially those in
  1382. many of the newer IBM Thinkpads. If you experience hangs when you
  1383. suspend, try setting this to Y. Otherwise, say N.
  1384. endif # APM
  1385. source "arch/x86/kernel/cpu/cpufreq/Kconfig"
  1386. source "drivers/cpuidle/Kconfig"
  1387. source "drivers/idle/Kconfig"
  1388. endmenu
  1389. menu "Bus options (PCI etc.)"
  1390. config PCI
  1391. bool "PCI support"
  1392. default y
  1393. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1394. help
  1395. Find out whether you have a PCI motherboard. PCI is the name of a
  1396. bus system, i.e. the way the CPU talks to the other stuff inside
  1397. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1398. VESA. If you have PCI, say Y, otherwise N.
  1399. choice
  1400. prompt "PCI access mode"
  1401. depends on X86_32 && PCI
  1402. default PCI_GOANY
  1403. ---help---
  1404. On PCI systems, the BIOS can be used to detect the PCI devices and
  1405. determine their configuration. However, some old PCI motherboards
  1406. have BIOS bugs and may crash if this is done. Also, some embedded
  1407. PCI-based systems don't have any BIOS at all. Linux can also try to
  1408. detect the PCI hardware directly without using the BIOS.
  1409. With this option, you can specify how Linux should detect the
  1410. PCI devices. If you choose "BIOS", the BIOS will be used,
  1411. if you choose "Direct", the BIOS won't be used, and if you
  1412. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1413. If you choose "Any", the kernel will try MMCONFIG, then the
  1414. direct access method and falls back to the BIOS if that doesn't
  1415. work. If unsure, go with the default, which is "Any".
  1416. config PCI_GOBIOS
  1417. bool "BIOS"
  1418. config PCI_GOMMCONFIG
  1419. bool "MMConfig"
  1420. config PCI_GODIRECT
  1421. bool "Direct"
  1422. config PCI_GOOLPC
  1423. bool "OLPC"
  1424. depends on OLPC
  1425. config PCI_GOANY
  1426. bool "Any"
  1427. endchoice
  1428. config PCI_BIOS
  1429. def_bool y
  1430. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1431. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1432. config PCI_DIRECT
  1433. def_bool y
  1434. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1435. config PCI_MMCONFIG
  1436. def_bool y
  1437. depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
  1438. config PCI_OLPC
  1439. def_bool y
  1440. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1441. config PCI_DOMAINS
  1442. def_bool y
  1443. depends on PCI
  1444. config PCI_MMCONFIG
  1445. bool "Support mmconfig PCI config space access"
  1446. depends on X86_64 && PCI && ACPI
  1447. config DMAR
  1448. bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
  1449. depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
  1450. help
  1451. DMA remapping (DMAR) devices support enables independent address
  1452. translations for Direct Memory Access (DMA) from devices.
  1453. These DMA remapping devices are reported via ACPI tables
  1454. and include PCI device scope covered by these DMA
  1455. remapping devices.
  1456. config DMAR_GFX_WA
  1457. def_bool y
  1458. prompt "Support for Graphics workaround"
  1459. depends on DMAR
  1460. help
  1461. Current Graphics drivers tend to use physical address
  1462. for DMA and avoid using DMA APIs. Setting this config
  1463. option permits the IOMMU driver to set a unity map for
  1464. all the OS-visible memory. Hence the driver can continue
  1465. to use physical addresses for DMA.
  1466. config DMAR_FLOPPY_WA
  1467. def_bool y
  1468. depends on DMAR
  1469. help
  1470. Floppy disk drivers are know to bypass DMA API calls
  1471. thereby failing to work when IOMMU is enabled. This
  1472. workaround will setup a 1:1 mapping for the first
  1473. 16M to make floppy (an ISA device) work.
  1474. config INTR_REMAP
  1475. bool "Support for Interrupt Remapping (EXPERIMENTAL)"
  1476. depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
  1477. help
  1478. Supports Interrupt remapping for IO-APIC and MSI devices.
  1479. To use x2apic mode in the CPU's which support x2APIC enhancements or
  1480. to support platforms with CPU's having > 8 bit APIC ID, say Y.
  1481. source "drivers/pci/pcie/Kconfig"
  1482. source "drivers/pci/Kconfig"
  1483. # x86_64 have no ISA slots, but do have ISA-style DMA.
  1484. config ISA_DMA_API
  1485. def_bool y
  1486. if X86_32
  1487. config ISA
  1488. bool "ISA support"
  1489. depends on !X86_VOYAGER
  1490. help
  1491. Find out whether you have ISA slots on your motherboard. ISA is the
  1492. name of a bus system, i.e. the way the CPU talks to the other stuff
  1493. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1494. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1495. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1496. config EISA
  1497. bool "EISA support"
  1498. depends on ISA
  1499. ---help---
  1500. The Extended Industry Standard Architecture (EISA) bus was
  1501. developed as an open alternative to the IBM MicroChannel bus.
  1502. The EISA bus provided some of the features of the IBM MicroChannel
  1503. bus while maintaining backward compatibility with cards made for
  1504. the older ISA bus. The EISA bus saw limited use between 1988 and
  1505. 1995 when it was made obsolete by the PCI bus.
  1506. Say Y here if you are building a kernel for an EISA-based machine.
  1507. Otherwise, say N.
  1508. source "drivers/eisa/Kconfig"
  1509. config MCA
  1510. bool "MCA support" if !X86_VOYAGER
  1511. default y if X86_VOYAGER
  1512. help
  1513. MicroChannel Architecture is found in some IBM PS/2 machines and
  1514. laptops. It is a bus system similar to PCI or ISA. See
  1515. <file:Documentation/mca.txt> (and especially the web page given
  1516. there) before attempting to build an MCA bus kernel.
  1517. source "drivers/mca/Kconfig"
  1518. config SCx200
  1519. tristate "NatSemi SCx200 support"
  1520. depends on !X86_VOYAGER
  1521. help
  1522. This provides basic support for National Semiconductor's
  1523. (now AMD's) Geode processors. The driver probes for the
  1524. PCI-IDs of several on-chip devices, so its a good dependency
  1525. for other scx200_* drivers.
  1526. If compiled as a module, the driver is named scx200.
  1527. config SCx200HR_TIMER
  1528. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1529. depends on SCx200 && GENERIC_TIME
  1530. default y
  1531. help
  1532. This driver provides a clocksource built upon the on-chip
  1533. 27MHz high-resolution timer. Its also a workaround for
  1534. NSC Geode SC-1100's buggy TSC, which loses time when the
  1535. processor goes idle (as is done by the scheduler). The
  1536. other workaround is idle=poll boot option.
  1537. config GEODE_MFGPT_TIMER
  1538. def_bool y
  1539. prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
  1540. depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
  1541. help
  1542. This driver provides a clock event source based on the MFGPT
  1543. timer(s) in the CS5535 and CS5536 companion chip for the geode.
  1544. MFGPTs have a better resolution and max interval than the
  1545. generic PIT, and are suitable for use as high-res timers.
  1546. config OLPC
  1547. bool "One Laptop Per Child support"
  1548. default n
  1549. help
  1550. Add support for detecting the unique features of the OLPC
  1551. XO hardware.
  1552. endif # X86_32
  1553. config K8_NB
  1554. def_bool y
  1555. depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
  1556. source "drivers/pcmcia/Kconfig"
  1557. source "drivers/pci/hotplug/Kconfig"
  1558. endmenu
  1559. menu "Executable file formats / Emulations"
  1560. source "fs/Kconfig.binfmt"
  1561. config IA32_EMULATION
  1562. bool "IA32 Emulation"
  1563. depends on X86_64
  1564. select COMPAT_BINFMT_ELF
  1565. help
  1566. Include code to run 32-bit programs under a 64-bit kernel. You should
  1567. likely turn this on, unless you're 100% sure that you don't have any
  1568. 32-bit programs left.
  1569. config IA32_AOUT
  1570. tristate "IA32 a.out support"
  1571. depends on IA32_EMULATION
  1572. help
  1573. Support old a.out binaries in the 32bit emulation.
  1574. config COMPAT
  1575. def_bool y
  1576. depends on IA32_EMULATION
  1577. config COMPAT_FOR_U64_ALIGNMENT
  1578. def_bool COMPAT
  1579. depends on X86_64
  1580. config SYSVIPC_COMPAT
  1581. def_bool y
  1582. depends on COMPAT && SYSVIPC
  1583. endmenu
  1584. config HAVE_ATOMIC_IOMAP
  1585. def_bool y
  1586. depends on X86_32
  1587. source "net/Kconfig"
  1588. source "drivers/Kconfig"
  1589. source "drivers/firmware/Kconfig"
  1590. source "fs/Kconfig"
  1591. source "arch/x86/Kconfig.debug"
  1592. source "security/Kconfig"
  1593. source "crypto/Kconfig"
  1594. source "arch/x86/kvm/Kconfig"
  1595. source "lib/Kconfig"