Kconfig 16 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see Documentation/kbuild/kconfig-language.txt.
  4. #
  5. # Note: ISA is disabled and will hopefully never be enabled.
  6. # If you managed to buy an ISA x86-64 box you'll have to fix all the
  7. # ISA drivers you need yourself.
  8. #
  9. mainmenu "Linux Kernel Configuration"
  10. config X86_64
  11. bool
  12. default y
  13. help
  14. Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
  15. classical 32-bit x86 architecture. For details see
  16. <http://www.x86-64.org/>.
  17. config 64BIT
  18. def_bool y
  19. config X86
  20. bool
  21. default y
  22. config SEMAPHORE_SLEEPERS
  23. bool
  24. default y
  25. config MMU
  26. bool
  27. default y
  28. config ISA
  29. bool
  30. config SBUS
  31. bool
  32. config RWSEM_GENERIC_SPINLOCK
  33. bool
  34. default y
  35. config RWSEM_XCHGADD_ALGORITHM
  36. bool
  37. config GENERIC_HWEIGHT
  38. bool
  39. default y
  40. config GENERIC_CALIBRATE_DELAY
  41. bool
  42. default y
  43. config X86_CMPXCHG
  44. bool
  45. default y
  46. config EARLY_PRINTK
  47. bool
  48. default y
  49. config GENERIC_ISA_DMA
  50. bool
  51. default y
  52. config GENERIC_IOMAP
  53. bool
  54. default y
  55. config ARCH_MAY_HAVE_PC_FDC
  56. bool
  57. default y
  58. config DMI
  59. bool
  60. default y
  61. source "init/Kconfig"
  62. menu "Processor type and features"
  63. choice
  64. prompt "Subarchitecture Type"
  65. default X86_PC
  66. config X86_PC
  67. bool "PC-compatible"
  68. help
  69. Choose this option if your computer is a standard PC or compatible.
  70. config X86_VSMP
  71. bool "Support for ScaleMP vSMP"
  72. help
  73. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  74. supposed to run on these EM64T-based machines. Only choose this option
  75. if you have one of these machines.
  76. endchoice
  77. choice
  78. prompt "Processor family"
  79. default MK8
  80. config MK8
  81. bool "AMD-Opteron/Athlon64"
  82. help
  83. Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  84. config MPSC
  85. bool "Intel EM64T"
  86. help
  87. Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  88. Extended Memory 64 Technology(EM64T). For details see
  89. <http://www.intel.com/technology/64bitextensions/>.
  90. config GENERIC_CPU
  91. bool "Generic-x86-64"
  92. help
  93. Generic x86-64 CPU.
  94. endchoice
  95. #
  96. # Define implied options from the CPU selection here
  97. #
  98. config X86_L1_CACHE_BYTES
  99. int
  100. default "128" if GENERIC_CPU || MPSC
  101. default "64" if MK8
  102. config X86_L1_CACHE_SHIFT
  103. int
  104. default "7" if GENERIC_CPU || MPSC
  105. default "6" if MK8
  106. config X86_TSC
  107. bool
  108. default y
  109. config X86_GOOD_APIC
  110. bool
  111. default y
  112. config MICROCODE
  113. tristate "/dev/cpu/microcode - Intel CPU microcode support"
  114. ---help---
  115. If you say Y here the 'File systems' section, you will be
  116. able to update the microcode on Intel processors. You will
  117. obviously need the actual microcode binary data itself which is
  118. not shipped with the Linux kernel.
  119. For latest news and information on obtaining all the required
  120. ingredients for this driver, check:
  121. <http://www.urbanmyth.org/microcode/>.
  122. To compile this driver as a module, choose M here: the
  123. module will be called microcode.
  124. If you use modprobe or kmod you may also want to add the line
  125. 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
  126. config X86_MSR
  127. tristate "/dev/cpu/*/msr - Model-specific register support"
  128. help
  129. This device gives privileged processes access to the x86
  130. Model-Specific Registers (MSRs). It is a character device with
  131. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  132. MSR accesses are directed to a specific CPU on multi-processor
  133. systems.
  134. config X86_CPUID
  135. tristate "/dev/cpu/*/cpuid - CPU information support"
  136. help
  137. This device gives processes access to the x86 CPUID instruction to
  138. be executed on a specific processor. It is a character device
  139. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  140. /dev/cpu/31/cpuid.
  141. config X86_HT
  142. bool
  143. depends on SMP && !MK8
  144. default y
  145. config MATH_EMULATION
  146. bool
  147. config MCA
  148. bool
  149. config EISA
  150. bool
  151. config X86_IO_APIC
  152. bool
  153. default y
  154. config X86_LOCAL_APIC
  155. bool
  156. default y
  157. config MTRR
  158. bool "MTRR (Memory Type Range Register) support"
  159. ---help---
  160. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  161. the Memory Type Range Registers (MTRRs) may be used to control
  162. processor access to memory ranges. This is most useful if you have
  163. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  164. allows bus write transfers to be combined into a larger transfer
  165. before bursting over the PCI/AGP bus. This can increase performance
  166. of image write operations 2.5 times or more. Saying Y here creates a
  167. /proc/mtrr file which may be used to manipulate your processor's
  168. MTRRs. Typically the X server should use this.
  169. This code has a reasonably generic interface so that similar
  170. control registers on other processors can be easily supported
  171. as well.
  172. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  173. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  174. can lead to all sorts of problems, so it's good to say Y here.
  175. Just say Y here, all x86-64 machines support MTRRs.
  176. See <file:Documentation/mtrr.txt> for more information.
  177. config SMP
  178. bool "Symmetric multi-processing support"
  179. ---help---
  180. This enables support for systems with more than one CPU. If you have
  181. a system with only one CPU, like most personal computers, say N. If
  182. you have a system with more than one CPU, say Y.
  183. If you say N here, the kernel will run on single and multiprocessor
  184. machines, but will use only one CPU of a multiprocessor machine. If
  185. you say Y here, the kernel will run on many, but not all,
  186. singleprocessor machines. On a singleprocessor machine, the kernel
  187. will run faster if you say N here.
  188. If you don't know what to do here, say N.
  189. config SCHED_SMT
  190. bool "SMT (Hyperthreading) scheduler support"
  191. depends on SMP
  192. default n
  193. help
  194. SMT scheduler support improves the CPU scheduler's decision making
  195. when dealing with Intel Pentium 4 chips with HyperThreading at a
  196. cost of slightly increased overhead in some places. If unsure say
  197. N here.
  198. config SCHED_MC
  199. bool "Multi-core scheduler support"
  200. depends on SMP
  201. default y
  202. help
  203. Multi-core scheduler support improves the CPU scheduler's decision
  204. making when dealing with multi-core CPU chips at a cost of slightly
  205. increased overhead in some places. If unsure say N here.
  206. source "kernel/Kconfig.preempt"
  207. config NUMA
  208. bool "Non Uniform Memory Access (NUMA) Support"
  209. depends on SMP
  210. help
  211. Enable NUMA (Non Uniform Memory Access) support. The kernel
  212. will try to allocate memory used by a CPU on the local memory
  213. controller of the CPU and add some more NUMA awareness to the kernel.
  214. This code is recommended on all multiprocessor Opteron systems.
  215. If the system is EM64T, you should say N unless your system is EM64T
  216. NUMA.
  217. config K8_NUMA
  218. bool "Old style AMD Opteron NUMA detection"
  219. depends on NUMA
  220. default y
  221. help
  222. Enable K8 NUMA node topology detection. You should say Y here if
  223. you have a multi processor AMD K8 system. This uses an old
  224. method to read the NUMA configurtion directly from the builtin
  225. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  226. instead, which also takes priority if both are compiled in.
  227. # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
  228. config X86_64_ACPI_NUMA
  229. bool "ACPI NUMA detection"
  230. depends on NUMA
  231. select ACPI
  232. select PCI
  233. select ACPI_NUMA
  234. default y
  235. help
  236. Enable ACPI SRAT based node topology detection.
  237. config NUMA_EMU
  238. bool "NUMA emulation"
  239. depends on NUMA
  240. help
  241. Enable NUMA emulation. A flat machine will be split
  242. into virtual nodes when booted with "numa=fake=N", where N is the
  243. number of nodes. This is only useful for debugging.
  244. config ARCH_DISCONTIGMEM_ENABLE
  245. bool
  246. depends on NUMA
  247. default y
  248. config ARCH_DISCONTIGMEM_ENABLE
  249. def_bool y
  250. depends on NUMA
  251. config ARCH_DISCONTIGMEM_DEFAULT
  252. def_bool y
  253. depends on NUMA
  254. config ARCH_SPARSEMEM_ENABLE
  255. def_bool y
  256. depends on (NUMA || EXPERIMENTAL)
  257. config ARCH_MEMORY_PROBE
  258. def_bool y
  259. depends on MEMORY_HOTPLUG
  260. config ARCH_FLATMEM_ENABLE
  261. def_bool y
  262. depends on !NUMA
  263. source "mm/Kconfig"
  264. config HAVE_ARCH_EARLY_PFN_TO_NID
  265. def_bool y
  266. depends on NUMA
  267. config OUT_OF_LINE_PFN_TO_PAGE
  268. def_bool y
  269. depends on DISCONTIGMEM
  270. config NR_CPUS
  271. int "Maximum number of CPUs (2-256)"
  272. range 2 255
  273. depends on SMP
  274. default "8"
  275. help
  276. This allows you to specify the maximum number of CPUs which this
  277. kernel will support. Current maximum is 256 CPUs due to
  278. APIC addressing limits. Less depending on the hardware.
  279. This is purely to save memory - each supported CPU requires
  280. memory in the static kernel configuration.
  281. config HOTPLUG_CPU
  282. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  283. depends on SMP && HOTPLUG && EXPERIMENTAL
  284. help
  285. Say Y here to experiment with turning CPUs off and on. CPUs
  286. can be controlled through /sys/devices/system/cpu/cpu#.
  287. Say N if you want to disable CPU hotplug.
  288. config HPET_TIMER
  289. bool
  290. default y
  291. help
  292. Use the IA-PC HPET (High Precision Event Timer) to manage
  293. time in preference to the PIT and RTC, if a HPET is
  294. present. The HPET provides a stable time base on SMP
  295. systems, unlike the TSC, but it is more expensive to access,
  296. as it is off-chip. You can find the HPET spec at
  297. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  298. config HPET_EMULATE_RTC
  299. bool "Provide RTC interrupt"
  300. depends on HPET_TIMER && RTC=y
  301. config GART_IOMMU
  302. bool "K8 GART IOMMU support"
  303. default y
  304. select SWIOTLB
  305. depends on PCI
  306. help
  307. Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors
  308. and for the bounce buffering software IOMMU.
  309. Needed to run systems with more than 3GB of memory properly with
  310. 32-bit PCI devices that do not support DAC (Double Address Cycle).
  311. The IOMMU can be turned off at runtime with the iommu=off parameter.
  312. Normally the kernel will take the right choice by itself.
  313. This option includes a driver for the AMD Opteron/Athlon64 IOMMU
  314. northbridge and a software emulation used on other systems without
  315. hardware IOMMU. If unsure, say Y.
  316. # need this always enabled with GART_IOMMU for the VIA workaround
  317. config SWIOTLB
  318. bool
  319. default y
  320. depends on GART_IOMMU
  321. config X86_MCE
  322. bool "Machine check support" if EMBEDDED
  323. default y
  324. help
  325. Include a machine check error handler to report hardware errors.
  326. This version will require the mcelog utility to decode some
  327. machine check error logs. See
  328. ftp://ftp.x86-64.org/pub/linux/tools/mcelog
  329. config X86_MCE_INTEL
  330. bool "Intel MCE features"
  331. depends on X86_MCE && X86_LOCAL_APIC
  332. default y
  333. help
  334. Additional support for intel specific MCE features such as
  335. the thermal monitor.
  336. config X86_MCE_AMD
  337. bool "AMD MCE features"
  338. depends on X86_MCE && X86_LOCAL_APIC
  339. default y
  340. help
  341. Additional support for AMD specific MCE features such as
  342. the DRAM Error Threshold.
  343. config KEXEC
  344. bool "kexec system call (EXPERIMENTAL)"
  345. depends on EXPERIMENTAL
  346. help
  347. kexec is a system call that implements the ability to shutdown your
  348. current kernel, and to start another kernel. It is like a reboot
  349. but it is indepedent of the system firmware. And like a reboot
  350. you can start any kernel with it, not just Linux.
  351. The name comes from the similiarity to the exec system call.
  352. It is an ongoing process to be certain the hardware in a machine
  353. is properly shutdown, so do not be surprised if this code does not
  354. initially work for you. It may help to enable device hotplugging
  355. support. As of this writing the exact hardware interface is
  356. strongly in flux, so no good recommendation can be made.
  357. config CRASH_DUMP
  358. bool "kernel crash dumps (EXPERIMENTAL)"
  359. depends on EXPERIMENTAL
  360. help
  361. Generate crash dump after being started by kexec.
  362. config PHYSICAL_START
  363. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  364. default "0x1000000" if CRASH_DUMP
  365. default "0x200000"
  366. help
  367. This gives the physical address where the kernel is loaded. Normally
  368. for regular kernels this value is 0x200000 (2MB). But in the case
  369. of kexec on panic the fail safe kernel needs to run at a different
  370. address than the panic-ed kernel. This option is used to set the load
  371. address for kernels used to capture crash dump on being kexec'ed
  372. after panic. The default value for crash dump kernels is
  373. 0x1000000 (16MB). This can also be set based on the "X" value as
  374. specified in the "crashkernel=YM@XM" command line boot parameter
  375. passed to the panic-ed kernel. Typically this parameter is set as
  376. crashkernel=64M@16M. Please take a look at
  377. Documentation/kdump/kdump.txt for more details about crash dumps.
  378. Don't change this unless you know what you are doing.
  379. config SECCOMP
  380. bool "Enable seccomp to safely compute untrusted bytecode"
  381. depends on PROC_FS
  382. default y
  383. help
  384. This kernel feature is useful for number crunching applications
  385. that may need to compute untrusted bytecode during their
  386. execution. By using pipes or other transports made available to
  387. the process as file descriptors supporting the read/write
  388. syscalls, it's possible to isolate those applications in
  389. their own address space using seccomp. Once seccomp is
  390. enabled via /proc/<pid>/seccomp, it cannot be disabled
  391. and the task is only allowed to execute a few safe syscalls
  392. defined by each seccomp mode.
  393. If unsure, say Y. Only embedded should say N here.
  394. source kernel/Kconfig.hz
  395. config REORDER
  396. bool "Function reordering"
  397. default n
  398. help
  399. This option enables the toolchain to reorder functions for a more
  400. optimal TLB usage. If you have pretty much any version of binutils,
  401. this can increase your kernel build time by roughly one minute.
  402. endmenu
  403. #
  404. # Use the generic interrupt handling code in kernel/irq/:
  405. #
  406. config GENERIC_HARDIRQS
  407. bool
  408. default y
  409. config GENERIC_IRQ_PROBE
  410. bool
  411. default y
  412. # we have no ISA slots, but we do have ISA-style DMA.
  413. config ISA_DMA_API
  414. bool
  415. default y
  416. config GENERIC_PENDING_IRQ
  417. bool
  418. depends on GENERIC_HARDIRQS && SMP
  419. default y
  420. menu "Power management options"
  421. source kernel/power/Kconfig
  422. source "drivers/acpi/Kconfig"
  423. source "arch/x86_64/kernel/cpufreq/Kconfig"
  424. endmenu
  425. menu "Bus options (PCI etc.)"
  426. config PCI
  427. bool "PCI support"
  428. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  429. config PCI_DIRECT
  430. bool
  431. depends on PCI
  432. default y
  433. config PCI_MMCONFIG
  434. bool "Support mmconfig PCI config space access"
  435. depends on PCI && ACPI
  436. source "drivers/pci/pcie/Kconfig"
  437. source "drivers/pci/Kconfig"
  438. source "drivers/pcmcia/Kconfig"
  439. source "drivers/pci/hotplug/Kconfig"
  440. endmenu
  441. menu "Executable file formats / Emulations"
  442. source "fs/Kconfig.binfmt"
  443. config IA32_EMULATION
  444. bool "IA32 Emulation"
  445. help
  446. Include code to run 32-bit programs under a 64-bit kernel. You should likely
  447. turn this on, unless you're 100% sure that you don't have any 32-bit programs
  448. left.
  449. config IA32_AOUT
  450. tristate "IA32 a.out support"
  451. depends on IA32_EMULATION
  452. help
  453. Support old a.out binaries in the 32bit emulation.
  454. config COMPAT
  455. bool
  456. depends on IA32_EMULATION
  457. default y
  458. config SYSVIPC_COMPAT
  459. bool
  460. depends on COMPAT && SYSVIPC
  461. default y
  462. endmenu
  463. source "net/Kconfig"
  464. source drivers/Kconfig
  465. source "drivers/firmware/Kconfig"
  466. source fs/Kconfig
  467. menu "Instrumentation Support"
  468. depends on EXPERIMENTAL
  469. source "arch/x86_64/oprofile/Kconfig"
  470. config KPROBES
  471. bool "Kprobes (EXPERIMENTAL)"
  472. depends on EXPERIMENTAL && MODULES
  473. help
  474. Kprobes allows you to trap at almost any kernel address and
  475. execute a callback function. register_kprobe() establishes
  476. a probepoint and specifies the callback. Kprobes is useful
  477. for kernel debugging, non-intrusive instrumentation and testing.
  478. If in doubt, say "N".
  479. endmenu
  480. source "arch/x86_64/Kconfig.debug"
  481. source "security/Kconfig"
  482. source "crypto/Kconfig"
  483. source "lib/Kconfig"