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