arch/x86_64/Kconfig

   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
  10 mainmenu "Linux Kernel Configuration"
  11
  12 config X86_64
  13         bool
  14         default y
  15         help
  16           Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
  17           classical 32-bit x86 architecture. For details see
  18           <http://www.x86-64.org/>.
  19
  20 config 64BIT
  21         def_bool y
  22
  23 config X86
  24         bool
  25         default y
  26
  27 config LOCKDEP_SUPPORT
  28         bool
  29         default y
  30
  31 config STACKTRACE_SUPPORT
  32         bool
  33         default y
  34
  35 config SEMAPHORE_SLEEPERS
  36         bool
  37         default y
  38
  39 config MMU
  40         bool
  41         default y
  42
  43 config ISA
  44         bool
  45
  46 config SBUS
  47         bool
  48
  49 config RWSEM_GENERIC_SPINLOCK
  50         bool
  51         default y
  52
  53 config RWSEM_XCHGADD_ALGORITHM
  54         bool
  55
  56 config GENERIC_HWEIGHT
  57         bool
  58         default y
  59
  60 config GENERIC_CALIBRATE_DELAY
  61         bool
  62         default y
  63
  64 config X86_CMPXCHG
  65         bool
  66         default y
  67
  68 config EARLY_PRINTK
  69         bool
  70         default y
  71
  72 config GENERIC_ISA_DMA
  73         bool
  74         default y
  75
  76 config GENERIC_IOMAP
  77         bool
  78         default y
  79
  80 config ARCH_MAY_HAVE_PC_FDC
  81         bool
  82         default y
  83
  84 config DMI
  85         bool
  86         default y
  87
  88 config AUDIT_ARCH
  89         bool
  90         default y
  91
  92 source "init/Kconfig"
  93
  94
  95 menu "Processor type and features"
  96
  97 choice
  98         prompt "Subarchitecture Type"
  99         default X86_PC
 100
 101 config X86_PC
 102         bool "PC-compatible"
 103         help
 104           Choose this option if your computer is a standard PC or compatible.
 105
 106 config X86_VSMP
 107         bool "Support for ScaleMP vSMP"
 108         depends on PCI
 109          help
 110           Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is
 111           supposed to run on these EM64T-based machines.  Only choose this option
 112           if you have one of these machines.
 113
 114 endchoice
 115
 116 choice
 117         prompt "Processor family"
 118         default MK8
 119
 120 config MK8
 121         bool "AMD-Opteron/Athlon64"
 122         help
 123           Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
 124
 125 config MPSC
 126        bool "Intel EM64T"
 127        help
 128           Optimize for Intel Pentium 4 and Xeon CPUs with Intel
 129           Extended Memory 64 Technology(EM64T). For details see
 130           <http://www.intel.com/technology/64bitextensions/>.
 131
 132 config GENERIC_CPU
 133         bool "Generic-x86-64"
 134         help
 135           Generic x86-64 CPU.
 136
 137 endchoice
 138
 139 #
 140 # Define implied options from the CPU selection here
 141 #
 142 config X86_L1_CACHE_BYTES
 143         int
 144         default "128" if GENERIC_CPU || MPSC
 145         default "64" if MK8
 146
 147 config X86_L1_CACHE_SHIFT
 148         int
 149         default "7" if GENERIC_CPU || MPSC
 150         default "6" if MK8
 151
 152 config X86_INTERNODE_CACHE_BYTES
 153         int
 154         default "4096" if X86_VSMP
 155         default X86_L1_CACHE_BYTES if !X86_VSMP
 156
 157 config X86_TSC
 158         bool
 159         default y
 160
 161 config X86_GOOD_APIC
 162         bool
 163         default y
 164
 165 config MICROCODE
 166         tristate "/dev/cpu/microcode - Intel CPU microcode support"
 167         ---help---
 168           If you say Y here the 'File systems' section, you will be
 169           able to update the microcode on Intel processors. You will
 170           obviously need the actual microcode binary data itself which is
 171           not shipped with the Linux kernel.
 172
 173           For latest news and information on obtaining all the required
 174           ingredients for this driver, check:
 175           <http://www.urbanmyth.org/microcode/>.
 176
 177           To compile this driver as a module, choose M here: the
 178           module will be called microcode.
 179           If you use modprobe or kmod you may also want to add the line
 180           'alias char-major-10-184 microcode' to your /etc/modules.conf file.
 181
 182 config X86_MSR
 183         tristate "/dev/cpu/*/msr - Model-specific register support"
 184         help
 185           This device gives privileged processes access to the x86
 186           Model-Specific Registers (MSRs).  It is a character device with
 187           major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
 188           MSR accesses are directed to a specific CPU on multi-processor
 189           systems.
 190
 191 config X86_CPUID
 192         tristate "/dev/cpu/*/cpuid - CPU information support"
 193         help
 194           This device gives processes access to the x86 CPUID instruction to
 195           be executed on a specific processor.  It is a character device
 196           with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 197           /dev/cpu/31/cpuid.
 198
 199 config X86_HT
 200         bool
 201         depends on SMP && !MK8
 202         default y
 203
 204 config MATH_EMULATION
 205         bool
 206
 207 config MCA
 208         bool
 209
 210 config EISA
 211         bool
 212
 213 config X86_IO_APIC
 214         bool
 215         default y
 216
 217 config X86_LOCAL_APIC
 218         bool
 219         default y
 220
 221 config MTRR
 222         bool "MTRR (Memory Type Range Register) support"
 223         ---help---
 224           On Intel P6 family processors (Pentium Pro, Pentium II and later)
 225           the Memory Type Range Registers (MTRRs) may be used to control
 226           processor access to memory ranges. This is most useful if you have
 227           a video (VGA) card on a PCI or AGP bus. Enabling write-combining
 228           allows bus write transfers to be combined into a larger transfer
 229           before bursting over the PCI/AGP bus. This can increase performance
 230           of image write operations 2.5 times or more. Saying Y here creates a
 231           /proc/mtrr file which may be used to manipulate your processor's
 232           MTRRs. Typically the X server should use this.
 233
 234           This code has a reasonably generic interface so that similar
 235           control registers on other processors can be easily supported
 236           as well.
 237
 238           Saying Y here also fixes a problem with buggy SMP BIOSes which only
 239           set the MTRRs for the boot CPU and not for the secondary CPUs. This
 240           can lead to all sorts of problems, so it's good to say Y here.
 241
 242           Just say Y here, all x86-64 machines support MTRRs.
 243
 244           See <file:Documentation/mtrr.txt> for more information.
 245
 246 config SMP
 247         bool "Symmetric multi-processing support"
 248         ---help---
 249           This enables support for systems with more than one CPU. If you have
 250           a system with only one CPU, like most personal computers, say N. If
 251           you have a system with more than one CPU, say Y.
 252
 253           If you say N here, the kernel will run on single and multiprocessor
 254           machines, but will use only one CPU of a multiprocessor machine. If
 255           you say Y here, the kernel will run on many, but not all,
 256           singleprocessor machines. On a singleprocessor machine, the kernel
 257           will run faster if you say N here.
 258
 259           If you don't know what to do here, say N.
 260
 261 config SCHED_SMT
 262         bool "SMT (Hyperthreading) scheduler support"
 263         depends on SMP
 264         default n
 265         help
 266           SMT scheduler support improves the CPU scheduler's decision making
 267           when dealing with Intel Pentium 4 chips with HyperThreading at a
 268           cost of slightly increased overhead in some places. If unsure say
 269           N here.
 270
 271 config SCHED_MC
 272         bool "Multi-core scheduler support"
 273         depends on SMP
 274         default y
 275         help
 276           Multi-core scheduler support improves the CPU scheduler's decision
 277           making when dealing with multi-core CPU chips at a cost of slightly
 278           increased overhead in some places. If unsure say N here.
 279
 280 source "kernel/Kconfig.preempt"
 281
 282 config NUMA
 283        bool "Non Uniform Memory Access (NUMA) Support"
 284        depends on SMP
 285        help
 286          Enable NUMA (Non Uniform Memory Access) support. The kernel
 287          will try to allocate memory used by a CPU on the local memory
 288          controller of the CPU and add some more NUMA awareness to the kernel.
 289          This code is recommended on all multiprocessor Opteron systems.
 290          If the system is EM64T, you should say N unless your system is EM64T
 291          NUMA.
 292
 293 config K8_NUMA
 294        bool "Old style AMD Opteron NUMA detection"
 295        depends on NUMA && PCI
 296        default y
 297        help
 298          Enable K8 NUMA node topology detection.  You should say Y here if
 299          you have a multi processor AMD K8 system. This uses an old
 300          method to read the NUMA configurtion directly from the builtin
 301          Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
 302          instead, which also takes priority if both are compiled in.
 303
 304 config NODES_SHIFT
 305         int
 306         default "6"
 307         depends on NEED_MULTIPLE_NODES
 308
 309 # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
 310
 311 config X86_64_ACPI_NUMA
 312        bool "ACPI NUMA detection"
 313        depends on NUMA
 314        select ACPI
 315         select PCI
 316        select ACPI_NUMA
 317        default y
 318        help
 319          Enable ACPI SRAT based node topology detection.
 320
 321 config NUMA_EMU
 322         bool "NUMA emulation"
 323         depends on NUMA
 324         help
 325           Enable NUMA emulation. A flat machine will be split
 326           into virtual nodes when booted with "numa=fake=N", where N is the
 327           number of nodes. This is only useful for debugging.
 328
 329 config ARCH_DISCONTIGMEM_ENABLE
 330        bool
 331        depends on NUMA
 332        default y
 333
 334
 335 config ARCH_DISCONTIGMEM_ENABLE
 336         def_bool y
 337         depends on NUMA
 338
 339 config ARCH_DISCONTIGMEM_DEFAULT
 340         def_bool y
 341         depends on NUMA
 342
 343 config ARCH_SPARSEMEM_ENABLE
 344         def_bool y
 345         depends on (NUMA || EXPERIMENTAL)
 346
 347 config ARCH_MEMORY_PROBE
 348         def_bool y
 349         depends on MEMORY_HOTPLUG
 350
 351 config ARCH_FLATMEM_ENABLE
 352         def_bool y
 353         depends on !NUMA
 354
 355 source "mm/Kconfig"
 356
 357 config HAVE_ARCH_EARLY_PFN_TO_NID
 358         def_bool y
 359         depends on NUMA
 360
 361 config OUT_OF_LINE_PFN_TO_PAGE
 362         def_bool y
 363         depends on DISCONTIGMEM
 364
 365 config NR_CPUS
 366         int "Maximum number of CPUs (2-256)"
 367         range 2 255
 368         depends on SMP
 369         default "8"
 370         help
 371           This allows you to specify the maximum number of CPUs which this
 372           kernel will support. Current maximum is 256 CPUs due to
 373           APIC addressing limits. Less depending on the hardware.
 374
 375           This is purely to save memory - each supported CPU requires
 376           memory in the static kernel configuration.
 377
 378 config HOTPLUG_CPU
 379         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 380         depends on SMP && HOTPLUG && EXPERIMENTAL
 381         help
 382                 Say Y here to experiment with turning CPUs off and on.  CPUs
 383                 can be controlled through /sys/devices/system/cpu/cpu#.
 384                 Say N if you want to disable CPU hotplug.
 385
 386 config ARCH_ENABLE_MEMORY_HOTPLUG
 387         def_bool y
 388
 389 config HPET_TIMER
 390         bool
 391         default y
 392         help
 393           Use the IA-PC HPET (High Precision Event Timer) to manage
 394           time in preference to the PIT and RTC, if a HPET is
 395           present.  The HPET provides a stable time base on SMP
 396           systems, unlike the TSC, but it is more expensive to access,
 397           as it is off-chip.  You can find the HPET spec at
 398           <http://www.intel.com/hardwaredesign/hpetspec.htm>.
 399
 400 config HPET_EMULATE_RTC
 401         bool "Provide RTC interrupt"
 402         depends on HPET_TIMER && RTC=y
 403
 404 # Mark as embedded because too many people got it wrong.
 405 # The code disables itself when not needed.
 406 config IOMMU
 407         bool "IOMMU support" if EMBEDDED
 408         default y
 409         select SWIOTLB
 410         select AGP
 411         depends on PCI
 412         help
 413           Support for full DMA access of devices with 32bit memory access only
 414           on systems with more than 3GB. This is usually needed for USB,
 415           sound, many IDE/SATA chipsets and some other devices.
 416           Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
 417           based IOMMU and a software bounce buffer based IOMMU used on Intel
 418           systems and as fallback.
 419           The code is only active when needed (enough memory and limited
 420           device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
 421           too.
 422
 423 config CALGARY_IOMMU
 424         bool "IBM Calgary IOMMU support"
 425         default y
 426         select SWIOTLB
 427         depends on PCI && EXPERIMENTAL
 428         help
 429           Support for hardware IOMMUs in IBM's xSeries x366 and x460
 430           systems. Needed to run systems with more than 3GB of memory
 431           properly with 32-bit PCI devices that do not support DAC
 432           (Double Address Cycle). Calgary also supports bus level
 433           isolation, where all DMAs pass through the IOMMU.  This
 434           prevents them from going anywhere except their intended
 435           destination. This catches hard-to-find kernel bugs and
 436           mis-behaving drivers and devices that do not use the DMA-API
 437           properly to set up their DMA buffers.  The IOMMU can be
 438           turned off at boot time with the iommu=off parameter.
 439           Normally the kernel will make the right choice by itself.
 440           If unsure, say Y.
 441
 442 # need this always selected by IOMMU for the VIA workaround
 443 config SWIOTLB
 444         bool
 445
 446 config X86_MCE
 447         bool "Machine check support" if EMBEDDED
 448         default y
 449         help
 450            Include a machine check error handler to report hardware errors.
 451            This version will require the mcelog utility to decode some
 452            machine check error logs. See
 453            ftp://ftp.x86-64.org/pub/linux/tools/mcelog
 454
 455 config X86_MCE_INTEL
 456         bool "Intel MCE features"
 457         depends on X86_MCE && X86_LOCAL_APIC
 458         default y
 459         help
 460            Additional support for intel specific MCE features such as
 461            the thermal monitor.
 462
 463 config X86_MCE_AMD
 464         bool "AMD MCE features"
 465         depends on X86_MCE && X86_LOCAL_APIC
 466         default y
 467         help
 468            Additional support for AMD specific MCE features such as
 469            the DRAM Error Threshold.
 470
 471 config KEXEC
 472         bool "kexec system call"
 473         help
 474           kexec is a system call that implements the ability to shutdown your
 475           current kernel, and to start another kernel.  It is like a reboot
 476           but it is independent of the system firmware.   And like a reboot
 477           you can start any kernel with it, not just Linux.
 478
 479           The name comes from the similarity to the exec system call.
 480
 481           It is an ongoing process to be certain the hardware in a machine
 482           is properly shutdown, so do not be surprised if this code does not
 483           initially work for you.  It may help to enable device hotplugging
 484           support.  As of this writing the exact hardware interface is
 485           strongly in flux, so no good recommendation can be made.
 486
 487 config CRASH_DUMP
 488         bool "kernel crash dumps (EXPERIMENTAL)"
 489         depends on EXPERIMENTAL
 490         help
 491           Generate crash dump after being started by kexec.
 492           This should be normally only set in special crash dump kernels
 493           which are loaded in the main kernel with kexec-tools into
 494           a specially reserved region and then later executed after
 495           a crash by kdump/kexec. The crash dump kernel must be compiled
 496           to a memory address not used by the main kernel or BIOS using
 497           PHYSICAL_START.
 498           For more details see Documentation/kdump/kdump.txt
 499
 500 config PHYSICAL_START
 501         hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
 502         default "0x1000000" if CRASH_DUMP
 503         default "0x200000"
 504         help
 505           This gives the physical address where the kernel is loaded. Normally
 506           for regular kernels this value is 0x200000 (2MB). But in the case
 507           of kexec on panic the fail safe kernel needs to run at a different
 508           address than the panic-ed kernel. This option is used to set the load
 509           address for kernels used to capture crash dump on being kexec'ed
 510           after panic. The default value for crash dump kernels is
 511           0x1000000 (16MB). This can also be set based on the "X" value as
 512           specified in the "crashkernel=YM@XM" command line boot parameter
 513           passed to the panic-ed kernel. Typically this parameter is set as
 514           crashkernel=64M@16M. Please take a look at
 515           Documentation/kdump/kdump.txt for more details about crash dumps.
 516
 517           Don't change this unless you know what you are doing.
 518
 519 config SECCOMP
 520         bool "Enable seccomp to safely compute untrusted bytecode"
 521         depends on PROC_FS
 522         default y
 523         help
 524           This kernel feature is useful for number crunching applications
 525           that may need to compute untrusted bytecode during their
 526           execution. By using pipes or other transports made available to
 527           the process as file descriptors supporting the read/write
 528           syscalls, it's possible to isolate those applications in
 529           their own address space using seccomp. Once seccomp is
 530           enabled via /proc/<pid>/seccomp, it cannot be disabled
 531           and the task is only allowed to execute a few safe syscalls
 532           defined by each seccomp mode.
 533
 534           If unsure, say Y. Only embedded should say N here.
 535
 536 config CC_STACKPROTECTOR
 537         bool "Enable -fstack-protector buffer overflow detection (EXPRIMENTAL)"
 538         depends on EXPERIMENTAL
 539         help
 540          This option turns on the -fstack-protector GCC feature. This
 541           feature puts, at the beginning of critical functions, a canary
 542           value on the stack just before the return address, and validates
 543           the value just before actually returning.  Stack based buffer
 544           overflows (that need to overwrite this return address) now also
 545           overwrite the canary, which gets detected and the attack is then
 546           neutralized via a kernel panic.
 547
 548           This feature requires gcc version 4.2 or above, or a distribution
 549           gcc with the feature backported. Older versions are automatically
 550           detected and for those versions, this configuration option is ignored.
 551
 552 config CC_STACKPROTECTOR_ALL
 553         bool "Use stack-protector for all functions"
 554         depends on CC_STACKPROTECTOR
 555         help
 556           Normally, GCC only inserts the canary value protection for
 557           functions that use large-ish on-stack buffers. By enabling
 558           this option, GCC will be asked to do this for ALL functions.
 559
 560 source kernel/Kconfig.hz
 561
 562 config REORDER
 563         bool "Function reordering"
 564         default n
 565         help
 566          This option enables the toolchain to reorder functions for a more
 567          optimal TLB usage. If you have pretty much any version of binutils,
 568          this can increase your kernel build time by roughly one minute.
 569
 570 config K8_NB
 571         def_bool y
 572         depends on AGP_AMD64 || IOMMU || (PCI && NUMA)
 573
 574 endmenu
 575
 576 #
 577 # Use the generic interrupt handling code in kernel/irq/:
 578 #
 579 config GENERIC_HARDIRQS
 580         bool
 581         default y
 582
 583 config GENERIC_IRQ_PROBE
 584         bool
 585         default y
 586
 587 # we have no ISA slots, but we do have ISA-style DMA.
 588 config ISA_DMA_API
 589         bool
 590         default y
 591
 592 config GENERIC_PENDING_IRQ
 593         bool
 594         depends on GENERIC_HARDIRQS && SMP
 595         default y
 596
 597 menu "Power management options"
 598
 599 source kernel/power/Kconfig
 600
 601 source "drivers/acpi/Kconfig"
 602
 603 source "arch/x86_64/kernel/cpufreq/Kconfig"
 604
 605 endmenu
 606
 607 menu "Bus options (PCI etc.)"
 608
 609 config PCI
 610         bool "PCI support"
 611
 612 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
 613 config PCI_DIRECT
 614         bool
 615         depends on PCI
 616         default y
 617
 618 config PCI_MMCONFIG
 619         bool "Support mmconfig PCI config space access"
 620         depends on PCI && ACPI
 621
 622 source "drivers/pci/pcie/Kconfig"
 623
 624 source "drivers/pci/Kconfig"
 625
 626 source "drivers/pcmcia/Kconfig"
 627
 628 source "drivers/pci/hotplug/Kconfig"
 629
 630 endmenu
 631
 632
 633 menu "Executable file formats / Emulations"
 634
 635 source "fs/Kconfig.binfmt"
 636
 637 config IA32_EMULATION
 638         bool "IA32 Emulation"
 639         help
 640           Include code to run 32-bit programs under a 64-bit kernel. You should likely
 641           turn this on, unless you're 100% sure that you don't have any 32-bit programs
 642           left.
 643
 644 config IA32_AOUT
 645        tristate "IA32 a.out support"
 646        depends on IA32_EMULATION
 647        help
 648          Support old a.out binaries in the 32bit emulation.
 649
 650 config COMPAT
 651         bool
 652         depends on IA32_EMULATION
 653         default y
 654
 655 config SYSVIPC_COMPAT
 656         bool
 657         depends on COMPAT && SYSVIPC
 658         default y
 659
 660 endmenu
 661
 662 source "net/Kconfig"
 663
 664 source drivers/Kconfig
 665
 666 source "drivers/firmware/Kconfig"
 667
 668 source fs/Kconfig
 669
 670 menu "Instrumentation Support"
 671         depends on EXPERIMENTAL
 672
 673 source "arch/x86_64/oprofile/Kconfig"
 674
 675 config KPROBES
 676         bool "Kprobes (EXPERIMENTAL)"
 677         depends on EXPERIMENTAL && MODULES
 678         help
 679           Kprobes allows you to trap at almost any kernel address and
 680           execute a callback function.  register_kprobe() establishes
 681           a probepoint and specifies the callback.  Kprobes is useful
 682           for kernel debugging, non-intrusive instrumentation and testing.
 683           If in doubt, say "N".
 684 endmenu
 685
 686 source "arch/x86_64/Kconfig.debug"
 687
 688 source "security/Kconfig"
 689
 690 source "crypto/Kconfig"
 691
 692 source "lib/Kconfig"