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