Kconfig 15 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. source "kernel/Kconfig.preempt"
  199. config NUMA
  200. bool "Non Uniform Memory Access (NUMA) Support"
  201. depends on SMP
  202. help
  203. Enable NUMA (Non Uniform Memory Access) support. The kernel
  204. will try to allocate memory used by a CPU on the local memory
  205. controller of the CPU and add some more NUMA awareness to the kernel.
  206. This code is recommended on all multiprocessor Opteron systems.
  207. If the system is EM64T, you should say N unless your system is EM64T
  208. NUMA.
  209. config K8_NUMA
  210. bool "Old style AMD Opteron NUMA detection"
  211. depends on NUMA
  212. default y
  213. help
  214. Enable K8 NUMA node topology detection. You should say Y here if
  215. you have a multi processor AMD K8 system. This uses an old
  216. method to read the NUMA configurtion directly from the builtin
  217. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  218. instead, which also takes priority if both are compiled in.
  219. # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
  220. config X86_64_ACPI_NUMA
  221. bool "ACPI NUMA detection"
  222. depends on NUMA
  223. select ACPI
  224. select ACPI_NUMA
  225. default y
  226. help
  227. Enable ACPI SRAT based node topology detection.
  228. config NUMA_EMU
  229. bool "NUMA emulation"
  230. depends on NUMA
  231. help
  232. Enable NUMA emulation. A flat machine will be split
  233. into virtual nodes when booted with "numa=fake=N", where N is the
  234. number of nodes. This is only useful for debugging.
  235. config ARCH_DISCONTIGMEM_ENABLE
  236. bool
  237. depends on NUMA
  238. default y
  239. config ARCH_DISCONTIGMEM_ENABLE
  240. def_bool y
  241. depends on NUMA
  242. config ARCH_DISCONTIGMEM_DEFAULT
  243. def_bool y
  244. depends on NUMA
  245. config ARCH_SPARSEMEM_ENABLE
  246. def_bool y
  247. depends on (NUMA || EXPERIMENTAL)
  248. config ARCH_MEMORY_PROBE
  249. def_bool y
  250. depends on MEMORY_HOTPLUG
  251. config ARCH_FLATMEM_ENABLE
  252. def_bool y
  253. depends on !NUMA
  254. source "mm/Kconfig"
  255. config HAVE_ARCH_EARLY_PFN_TO_NID
  256. def_bool y
  257. depends on NUMA
  258. config NR_CPUS
  259. int "Maximum number of CPUs (2-256)"
  260. range 2 255
  261. depends on SMP
  262. default "8"
  263. help
  264. This allows you to specify the maximum number of CPUs which this
  265. kernel will support. Current maximum is 256 CPUs due to
  266. APIC addressing limits. Less depending on the hardware.
  267. This is purely to save memory - each supported CPU requires
  268. memory in the static kernel configuration.
  269. config HOTPLUG_CPU
  270. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  271. depends on SMP && HOTPLUG && EXPERIMENTAL
  272. help
  273. Say Y here to experiment with turning CPUs off and on. CPUs
  274. can be controlled through /sys/devices/system/cpu/cpu#.
  275. Say N if you want to disable CPU hotplug.
  276. config HPET_TIMER
  277. bool
  278. default y
  279. help
  280. Use the IA-PC HPET (High Precision Event Timer) to manage
  281. time in preference to the PIT and RTC, if a HPET is
  282. present. The HPET provides a stable time base on SMP
  283. systems, unlike the TSC, but it is more expensive to access,
  284. as it is off-chip. You can find the HPET spec at
  285. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  286. config HPET_EMULATE_RTC
  287. bool "Provide RTC interrupt"
  288. depends on HPET_TIMER && RTC=y
  289. config GART_IOMMU
  290. bool "K8 GART IOMMU support"
  291. default y
  292. select SWIOTLB
  293. depends on PCI
  294. help
  295. Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors
  296. and for the bounce buffering software IOMMU.
  297. Needed to run systems with more than 3GB of memory properly with
  298. 32-bit PCI devices that do not support DAC (Double Address Cycle).
  299. The IOMMU can be turned off at runtime with the iommu=off parameter.
  300. Normally the kernel will take the right choice by itself.
  301. This option includes a driver for the AMD Opteron/Athlon64 IOMMU
  302. northbridge and a software emulation used on other systems without
  303. hardware IOMMU. If unsure, say Y.
  304. # need this always enabled with GART_IOMMU for the VIA workaround
  305. config SWIOTLB
  306. bool
  307. default y
  308. depends on GART_IOMMU
  309. config X86_MCE
  310. bool "Machine check support" if EMBEDDED
  311. default y
  312. help
  313. Include a machine check error handler to report hardware errors.
  314. This version will require the mcelog utility to decode some
  315. machine check error logs. See
  316. ftp://ftp.x86-64.org/pub/linux/tools/mcelog
  317. config X86_MCE_INTEL
  318. bool "Intel MCE features"
  319. depends on X86_MCE && X86_LOCAL_APIC
  320. default y
  321. help
  322. Additional support for intel specific MCE features such as
  323. the thermal monitor.
  324. config X86_MCE_AMD
  325. bool "AMD MCE features"
  326. depends on X86_MCE && X86_LOCAL_APIC
  327. default y
  328. help
  329. Additional support for AMD specific MCE features such as
  330. the DRAM Error Threshold.
  331. config KEXEC
  332. bool "kexec system call (EXPERIMENTAL)"
  333. depends on EXPERIMENTAL
  334. help
  335. kexec is a system call that implements the ability to shutdown your
  336. current kernel, and to start another kernel. It is like a reboot
  337. but it is indepedent of the system firmware. And like a reboot
  338. you can start any kernel with it, not just Linux.
  339. The name comes from the similiarity to the exec system call.
  340. It is an ongoing process to be certain the hardware in a machine
  341. is properly shutdown, so do not be surprised if this code does not
  342. initially work for you. It may help to enable device hotplugging
  343. support. As of this writing the exact hardware interface is
  344. strongly in flux, so no good recommendation can be made.
  345. config CRASH_DUMP
  346. bool "kernel crash dumps (EXPERIMENTAL)"
  347. depends on EXPERIMENTAL
  348. help
  349. Generate crash dump after being started by kexec.
  350. config PHYSICAL_START
  351. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  352. default "0x1000000" if CRASH_DUMP
  353. default "0x200000"
  354. help
  355. This gives the physical address where the kernel is loaded. Normally
  356. for regular kernels this value is 0x200000 (2MB). But in the case
  357. of kexec on panic the fail safe kernel needs to run at a different
  358. address than the panic-ed kernel. This option is used to set the load
  359. address for kernels used to capture crash dump on being kexec'ed
  360. after panic. The default value for crash dump kernels is
  361. 0x1000000 (16MB). This can also be set based on the "X" value as
  362. specified in the "crashkernel=YM@XM" command line boot parameter
  363. passed to the panic-ed kernel. Typically this parameter is set as
  364. crashkernel=64M@16M. Please take a look at
  365. Documentation/kdump/kdump.txt for more details about crash dumps.
  366. Don't change this unless you know what you are doing.
  367. config SECCOMP
  368. bool "Enable seccomp to safely compute untrusted bytecode"
  369. depends on PROC_FS
  370. default y
  371. help
  372. This kernel feature is useful for number crunching applications
  373. that may need to compute untrusted bytecode during their
  374. execution. By using pipes or other transports made available to
  375. the process as file descriptors supporting the read/write
  376. syscalls, it's possible to isolate those applications in
  377. their own address space using seccomp. Once seccomp is
  378. enabled via /proc/<pid>/seccomp, it cannot be disabled
  379. and the task is only allowed to execute a few safe syscalls
  380. defined by each seccomp mode.
  381. If unsure, say Y. Only embedded should say N here.
  382. source kernel/Kconfig.hz
  383. config REORDER
  384. bool "Function reordering"
  385. default n
  386. help
  387. This option enables the toolchain to reorder functions for a more
  388. optimal TLB usage. If you have pretty much any version of binutils,
  389. this can increase your kernel build time by roughly one minute.
  390. endmenu
  391. #
  392. # Use the generic interrupt handling code in kernel/irq/:
  393. #
  394. config GENERIC_HARDIRQS
  395. bool
  396. default y
  397. config GENERIC_IRQ_PROBE
  398. bool
  399. default y
  400. # we have no ISA slots, but we do have ISA-style DMA.
  401. config ISA_DMA_API
  402. bool
  403. default y
  404. config GENERIC_PENDING_IRQ
  405. bool
  406. depends on GENERIC_HARDIRQS && SMP
  407. default y
  408. menu "Power management options"
  409. source kernel/power/Kconfig
  410. source "drivers/acpi/Kconfig"
  411. source "arch/x86_64/kernel/cpufreq/Kconfig"
  412. endmenu
  413. menu "Bus options (PCI etc.)"
  414. config PCI
  415. bool "PCI support"
  416. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  417. config PCI_DIRECT
  418. bool
  419. depends on PCI
  420. default y
  421. config PCI_MMCONFIG
  422. bool "Support mmconfig PCI config space access"
  423. depends on PCI && ACPI
  424. source "drivers/pci/pcie/Kconfig"
  425. source "drivers/pci/Kconfig"
  426. source "drivers/pcmcia/Kconfig"
  427. source "drivers/pci/hotplug/Kconfig"
  428. endmenu
  429. menu "Executable file formats / Emulations"
  430. source "fs/Kconfig.binfmt"
  431. config IA32_EMULATION
  432. bool "IA32 Emulation"
  433. help
  434. Include code to run 32-bit programs under a 64-bit kernel. You should likely
  435. turn this on, unless you're 100% sure that you don't have any 32-bit programs
  436. left.
  437. config IA32_AOUT
  438. tristate "IA32 a.out support"
  439. depends on IA32_EMULATION
  440. help
  441. Support old a.out binaries in the 32bit emulation.
  442. config COMPAT
  443. bool
  444. depends on IA32_EMULATION
  445. default y
  446. config SYSVIPC_COMPAT
  447. bool
  448. depends on COMPAT && SYSVIPC
  449. default y
  450. endmenu
  451. source "net/Kconfig"
  452. source drivers/Kconfig
  453. source "drivers/firmware/Kconfig"
  454. source fs/Kconfig
  455. menu "Instrumentation Support"
  456. depends on EXPERIMENTAL
  457. source "arch/x86_64/oprofile/Kconfig"
  458. config KPROBES
  459. bool "Kprobes (EXPERIMENTAL)"
  460. depends on EXPERIMENTAL && MODULES
  461. help
  462. Kprobes allows you to trap at almost any kernel address and
  463. execute a callback function. register_kprobe() establishes
  464. a probepoint and specifies the callback. Kprobes is useful
  465. for kernel debugging, non-intrusive instrumentation and testing.
  466. If in doubt, say "N".
  467. endmenu
  468. source "arch/x86_64/Kconfig.debug"
  469. source "security/Kconfig"
  470. source "crypto/Kconfig"
  471. source "lib/Kconfig"