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_CALIBRATE_DELAY
  49         bool
  50         default y
  51
  52 config X86_CMPXCHG
  53         bool
  54         default y
  55
  56 config EARLY_PRINTK
  57         bool
  58         default y
  59
  60 config GENERIC_ISA_DMA
  61         bool
  62         default y
  63
  64 config GENERIC_IOMAP
  65         bool
  66         default y
  67
  68 config ARCH_MAY_HAVE_PC_FDC
  69         bool
  70         default y
  71
  72 config DMI
  73         bool
  74         default y
  75
  76 source "init/Kconfig"
  77
  78
  79 menu "Processor type and features"
  80
  81 choice
  82         prompt "Processor family"
  83         default MK8
  84
  85 config MK8
  86         bool "AMD-Opteron/Athlon64"
  87         help
  88           Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  89
  90 config MPSC
  91        bool "Intel EM64T"
  92        help
  93           Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  94           Extended Memory 64 Technology(EM64T). For details see
  95           <http://www.intel.com/technology/64bitextensions/>.
  96
  97 config GENERIC_CPU
  98         bool "Generic-x86-64"
  99         help
 100           Generic x86-64 CPU.
 101
 102 endchoice
 103
 104 #
 105 # Define implied options from the CPU selection here
 106 #
 107 config X86_L1_CACHE_BYTES
 108         int
 109         default "128" if GENERIC_CPU || MPSC
 110         default "64" if MK8
 111
 112 config X86_L1_CACHE_SHIFT
 113         int
 114         default "7" if GENERIC_CPU || MPSC
 115         default "6" if MK8
 116
 117 config X86_TSC
 118         bool
 119         default y
 120
 121 config X86_GOOD_APIC
 122         bool
 123         default y
 124
 125 config MICROCODE
 126         tristate "/dev/cpu/microcode - Intel CPU microcode support"
 127         ---help---
 128           If you say Y here the 'File systems' section, you will be
 129           able to update the microcode on Intel processors. You will
 130           obviously need the actual microcode binary data itself which is
 131           not shipped with the Linux kernel.
 132
 133           For latest news and information on obtaining all the required
 134           ingredients for this driver, check:
 135           <http://www.urbanmyth.org/microcode/>.
 136
 137           To compile this driver as a module, choose M here: the
 138           module will be called microcode.
 139           If you use modprobe or kmod you may also want to add the line
 140           'alias char-major-10-184 microcode' to your /etc/modules.conf file.
 141
 142 config X86_MSR
 143         tristate "/dev/cpu/*/msr - Model-specific register support"
 144         help
 145           This device gives privileged processes access to the x86
 146           Model-Specific Registers (MSRs).  It is a character device with
 147           major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
 148           MSR accesses are directed to a specific CPU on multi-processor
 149           systems.
 150
 151 config X86_CPUID
 152         tristate "/dev/cpu/*/cpuid - CPU information support"
 153         help
 154           This device gives processes access to the x86 CPUID instruction to
 155           be executed on a specific processor.  It is a character device
 156           with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 157           /dev/cpu/31/cpuid.
 158
 159 config X86_HT
 160         bool
 161         depends on SMP && !MK8
 162         default y
 163
 164 config MATH_EMULATION
 165         bool
 166
 167 config MCA
 168         bool
 169
 170 config EISA
 171         bool
 172
 173 config X86_IO_APIC
 174         bool
 175         default y
 176
 177 config X86_LOCAL_APIC
 178         bool
 179         default y
 180
 181 config MTRR
 182         bool "MTRR (Memory Type Range Register) support"
 183         ---help---
 184           On Intel P6 family processors (Pentium Pro, Pentium II and later)
 185           the Memory Type Range Registers (MTRRs) may be used to control
 186           processor access to memory ranges. This is most useful if you have
 187           a video (VGA) card on a PCI or AGP bus. Enabling write-combining
 188           allows bus write transfers to be combined into a larger transfer
 189           before bursting over the PCI/AGP bus. This can increase performance
 190           of image write operations 2.5 times or more. Saying Y here creates a
 191           /proc/mtrr file which may be used to manipulate your processor's
 192           MTRRs. Typically the X server should use this.
 193
 194           This code has a reasonably generic interface so that similar
 195           control registers on other processors can be easily supported
 196           as well.
 197
 198           Saying Y here also fixes a problem with buggy SMP BIOSes which only
 199           set the MTRRs for the boot CPU and not for the secondary CPUs. This
 200           can lead to all sorts of problems, so it's good to say Y here.
 201
 202           Just say Y here, all x86-64 machines support MTRRs.
 203
 204           See <file:Documentation/mtrr.txt> for more information.
 205
 206 config SMP
 207         bool "Symmetric multi-processing support"
 208         ---help---
 209           This enables support for systems with more than one CPU. If you have
 210           a system with only one CPU, like most personal computers, say N. If
 211           you have a system with more than one CPU, say Y.
 212
 213           If you say N here, the kernel will run on single and multiprocessor
 214           machines, but will use only one CPU of a multiprocessor machine. If
 215           you say Y here, the kernel will run on many, but not all,
 216           singleprocessor machines. On a singleprocessor machine, the kernel
 217           will run faster if you say N here.
 218
 219           If you don't know what to do here, say N.
 220
 221 config SCHED_SMT
 222         bool "SMT (Hyperthreading) scheduler support"
 223         depends on SMP
 224         default n
 225         help
 226           SMT scheduler support improves the CPU scheduler's decision making
 227           when dealing with Intel Pentium 4 chips with HyperThreading at a
 228           cost of slightly increased overhead in some places. If unsure say
 229           N here.
 230
 231 source "kernel/Kconfig.preempt"
 232
 233 config NUMA
 234        bool "Non Uniform Memory Access (NUMA) Support"
 235        depends on SMP
 236        help
 237          Enable NUMA (Non Uniform Memory Access) support. The kernel
 238          will try to allocate memory used by a CPU on the local memory
 239          controller of the CPU and add some more NUMA awareness to the kernel.
 240          This code is recommended on all multiprocessor Opteron systems.
 241          If the system is EM64T, you should say N unless your system is EM64T
 242          NUMA.
 243
 244 config K8_NUMA
 245        bool "Old style AMD Opteron NUMA detection"
 246        depends on NUMA
 247        default y
 248        help
 249          Enable K8 NUMA node topology detection.  You should say Y here if
 250          you have a multi processor AMD K8 system. This uses an old
 251          method to read the NUMA configurtion directly from the builtin
 252          Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
 253          instead, which also takes priority if both are compiled in.
 254
 255 # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
 256
 257 config X86_64_ACPI_NUMA
 258        bool "ACPI NUMA detection"
 259        depends on NUMA
 260        select ACPI
 261        select ACPI_NUMA
 262        default y
 263        help
 264          Enable ACPI SRAT based node topology detection.
 265
 266 config NUMA_EMU
 267         bool "NUMA emulation"
 268         depends on NUMA
 269         help
 270           Enable NUMA emulation. A flat machine will be split
 271           into virtual nodes when booted with "numa=fake=N", where N is the
 272           number of nodes. This is only useful for debugging.
 273
 274 config ARCH_DISCONTIGMEM_ENABLE
 275        bool
 276        depends on NUMA
 277        default y
 278
 279
 280 config ARCH_DISCONTIGMEM_ENABLE
 281         def_bool y
 282         depends on NUMA
 283
 284 config ARCH_DISCONTIGMEM_DEFAULT
 285         def_bool y
 286         depends on NUMA
 287
 288 config ARCH_SPARSEMEM_ENABLE
 289         def_bool y
 290         depends on NUMA
 291
 292 config ARCH_FLATMEM_ENABLE
 293         def_bool y
 294         depends on !NUMA
 295
 296 source "mm/Kconfig"
 297
 298 config HAVE_ARCH_EARLY_PFN_TO_NID
 299         def_bool y
 300
 301 config NR_CPUS
 302         int "Maximum number of CPUs (2-256)"
 303         range 2 256
 304         depends on SMP
 305         default "8"
 306         help
 307           This allows you to specify the maximum number of CPUs which this
 308           kernel will support. Current maximum is 256 CPUs due to
 309           APIC addressing limits. Less depending on the hardware.
 310
 311           This is purely to save memory - each supported CPU requires
 312           memory in the static kernel configuration.
 313
 314 config HOTPLUG_CPU
 315         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 316         depends on SMP && HOTPLUG && EXPERIMENTAL
 317         help
 318                 Say Y here to experiment with turning CPUs off and on.  CPUs
 319                 can be controlled through /sys/devices/system/cpu/cpu#.
 320                 Say N if you want to disable CPU hotplug.
 321
 322
 323 config HPET_TIMER
 324         bool
 325         default y
 326         help
 327           Use the IA-PC HPET (High Precision Event Timer) to manage
 328           time in preference to the PIT and RTC, if a HPET is
 329           present.  The HPET provides a stable time base on SMP
 330           systems, unlike the TSC, but it is more expensive to access,
 331           as it is off-chip.  You can find the HPET spec at
 332           <http://www.intel.com/hardwaredesign/hpetspec.htm>.
 333
 334 config X86_PM_TIMER
 335         bool "PM timer"
 336         depends on ACPI
 337         default y
 338         help
 339           Support the ACPI PM timer for time keeping. This is slow,
 340           but is useful on some chipsets without HPET on systems with more
 341           than one CPU. On a single processor or single socket multi core
 342           system it is normally not required.
 343           When the PM timer is active 64bit vsyscalls are disabled
 344           and should not be enabled (/proc/sys/kernel/vsyscall64 should
 345           not be changed).
 346           The kernel selects the PM timer only as a last resort, so it is
 347           useful to enable just in case.
 348
 349 config HPET_EMULATE_RTC
 350         bool "Provide RTC interrupt"
 351         depends on HPET_TIMER && RTC=y
 352
 353 config GART_IOMMU
 354         bool "K8 GART IOMMU support"
 355         default y
 356         select SWIOTLB
 357         depends on PCI
 358         help
 359           Support the IOMMU. Needed to run systems with more than 3GB of memory
 360           properly with 32-bit PCI devices that do not support DAC (Double Address
 361           Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
 362           Normally the kernel will take the right choice by itself.
 363           This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
 364           and a software emulation used on other systems.
 365           If unsure, say Y.
 366
 367 # need this always enabled with GART_IOMMU for the VIA workaround
 368 config SWIOTLB
 369         bool
 370         default y
 371         depends on GART_IOMMU
 372
 373 config X86_MCE
 374         bool "Machine check support" if EMBEDDED
 375         default y
 376         help
 377            Include a machine check error handler to report hardware errors.
 378            This version will require the mcelog utility to decode some
 379            machine check error logs. See
 380            ftp://ftp.x86-64.org/pub/linux/tools/mcelog
 381
 382 config X86_MCE_INTEL
 383         bool "Intel MCE features"
 384         depends on X86_MCE && X86_LOCAL_APIC
 385         default y
 386         help
 387            Additional support for intel specific MCE features such as
 388            the thermal monitor.
 389
 390 config X86_MCE_AMD
 391         bool "AMD MCE features"
 392         depends on X86_MCE && X86_LOCAL_APIC
 393         default y
 394         help
 395            Additional support for AMD specific MCE features such as
 396            the DRAM Error Threshold.
 397
 398 config KEXEC
 399         bool "kexec system call (EXPERIMENTAL)"
 400         depends on EXPERIMENTAL
 401         help
 402           kexec is a system call that implements the ability to shutdown your
 403           current kernel, and to start another kernel.  It is like a reboot
 404           but it is indepedent of the system firmware.   And like a reboot
 405           you can start any kernel with it, not just Linux.
 406
 407           The name comes from the similiarity to the exec system call.
 408
 409           It is an ongoing process to be certain the hardware in a machine
 410           is properly shutdown, so do not be surprised if this code does not
 411           initially work for you.  It may help to enable device hotplugging
 412           support.  As of this writing the exact hardware interface is
 413           strongly in flux, so no good recommendation can be made.
 414
 415 config CRASH_DUMP
 416         bool "kernel crash dumps (EXPERIMENTAL)"
 417         depends on EXPERIMENTAL
 418         help
 419                 Generate crash dump after being started by kexec.
 420
 421 config PHYSICAL_START
 422         hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
 423         default "0x1000000" if CRASH_DUMP
 424         default "0x100000"
 425         help
 426           This gives the physical address where the kernel is loaded. Normally
 427           for regular kernels this value is 0x100000 (1MB). But in the case
 428           of kexec on panic the fail safe kernel needs to run at a different
 429           address than the panic-ed kernel. This option is used to set the load
 430           address for kernels used to capture crash dump on being kexec'ed
 431           after panic. The default value for crash dump kernels is
 432           0x1000000 (16MB). This can also be set based on the "X" value as
 433           specified in the "crashkernel=YM@XM" command line boot parameter
 434           passed to the panic-ed kernel. Typically this parameter is set as
 435           crashkernel=64M@16M. Please take a look at
 436           Documentation/kdump/kdump.txt for more details about crash dumps.
 437
 438           Don't change this unless you know what you are doing.
 439
 440 config SECCOMP
 441         bool "Enable seccomp to safely compute untrusted bytecode"
 442         depends on PROC_FS
 443         default y
 444         help
 445           This kernel feature is useful for number crunching applications
 446           that may need to compute untrusted bytecode during their
 447           execution. By using pipes or other transports made available to
 448           the process as file descriptors supporting the read/write
 449           syscalls, it's possible to isolate those applications in
 450           their own address space using seccomp. Once seccomp is
 451           enabled via /proc/<pid>/seccomp, it cannot be disabled
 452           and the task is only allowed to execute a few safe syscalls
 453           defined by each seccomp mode.
 454
 455           If unsure, say Y. Only embedded should say N here.
 456
 457 source kernel/Kconfig.hz
 458
 459 endmenu
 460
 461 #
 462 # Use the generic interrupt handling code in kernel/irq/:
 463 #
 464 config GENERIC_HARDIRQS
 465         bool
 466         default y
 467
 468 config GENERIC_IRQ_PROBE
 469         bool
 470         default y
 471
 472 # we have no ISA slots, but we do have ISA-style DMA.
 473 config ISA_DMA_API
 474         bool
 475         default y
 476
 477 config GENERIC_PENDING_IRQ
 478         bool
 479         depends on GENERIC_HARDIRQS && SMP
 480         default y
 481
 482 menu "Power management options"
 483
 484 source kernel/power/Kconfig
 485
 486 source "drivers/acpi/Kconfig"
 487
 488 source "arch/x86_64/kernel/cpufreq/Kconfig"
 489
 490 endmenu
 491
 492 menu "Bus options (PCI etc.)"
 493
 494 config PCI
 495         bool "PCI support"
 496
 497 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
 498 config PCI_DIRECT
 499         bool
 500         depends on PCI
 501         default y
 502
 503 config PCI_MMCONFIG
 504         bool "Support mmconfig PCI config space access"
 505         depends on PCI && ACPI
 506
 507 config UNORDERED_IO
 508        bool "Unordered IO mapping access"
 509        depends on EXPERIMENTAL
 510        help
 511          Use unordered stores to access IO memory mappings in device drivers.
 512          Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
 513          work with this option, but it makes the drivers behave differently
 514          from i386. Requires that the driver writer used memory barriers
 515          properly.
 516
 517 source "drivers/pci/pcie/Kconfig"
 518
 519 source "drivers/pci/Kconfig"
 520
 521 source "drivers/pcmcia/Kconfig"
 522
 523 source "drivers/pci/hotplug/Kconfig"
 524
 525 endmenu
 526
 527
 528 menu "Executable file formats / Emulations"
 529
 530 source "fs/Kconfig.binfmt"
 531
 532 config IA32_EMULATION
 533         bool "IA32 Emulation"
 534         help
 535           Include code to run 32-bit programs under a 64-bit kernel. You should likely
 536           turn this on, unless you're 100% sure that you don't have any 32-bit programs
 537           left.
 538
 539 config IA32_AOUT
 540        tristate "IA32 a.out support"
 541        depends on IA32_EMULATION
 542        help
 543          Support old a.out binaries in the 32bit emulation.
 544
 545 config COMPAT
 546         bool
 547         depends on IA32_EMULATION
 548         default y
 549
 550 config SYSVIPC_COMPAT
 551         bool
 552         depends on COMPAT && SYSVIPC
 553         default y
 554
 555 endmenu
 556
 557 source "net/Kconfig"
 558
 559 source drivers/Kconfig
 560
 561 source "drivers/firmware/Kconfig"
 562
 563 source fs/Kconfig
 564
 565 menu "Instrumentation Support"
 566         depends on EXPERIMENTAL
 567
 568 source "arch/x86_64/oprofile/Kconfig"
 569
 570 config KPROBES
 571         bool "Kprobes (EXPERIMENTAL)"
 572         help
 573           Kprobes allows you to trap at almost any kernel address and
 574           execute a callback function.  register_kprobe() establishes
 575           a probepoint and specifies the callback.  Kprobes is useful
 576           for kernel debugging, non-intrusive instrumentation and testing.
 577           If in doubt, say "N".
 578 endmenu
 579
 580 source "arch/x86_64/Kconfig.debug"
 581
 582 source "security/Kconfig"
 583
 584 source "crypto/Kconfig"
 585
 586 source "lib/Kconfig"