arch/x86/Kconfig.cpu

   1 # Put here option for CPU selection and depending optimization
   2 choice
   3         prompt "Processor family"
   4         default M686 if X86_32
   5         default GENERIC_CPU if X86_64
   6         ---help---
   7           This is the processor type of your CPU. This information is
   8           used for optimizing purposes. In order to compile a kernel
   9           that can run on all supported x86 CPU types (albeit not
  10           optimally fast), you can specify "486" here.
  11
  12           Note that the 386 is no longer supported, this includes
  13           AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
  14           UMC 486SX-S and the NexGen Nx586.
  15
  16           The kernel will not necessarily run on earlier architectures than
  17           the one you have chosen, e.g. a Pentium optimized kernel will run on
  18           a PPro, but not necessarily on a i486.
  19
  20           Here are the settings recommended for greatest speed:
  21           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
  22             SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  23           - "586" for generic Pentium CPUs lacking the TSC
  24             (time stamp counter) register.
  25           - "Pentium-Classic" for the Intel Pentium.
  26           - "Pentium-MMX" for the Intel Pentium MMX.
  27           - "Pentium-Pro" for the Intel Pentium Pro.
  28           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
  29           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
  30           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
  31           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
  32           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
  33           - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs.
  34           - "Crusoe" for the Transmeta Crusoe series.
  35           - "Efficeon" for the Transmeta Efficeon series.
  36           - "Winchip-C6" for original IDT Winchip.
  37           - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
  38           - "AMD Elan" for the 32-bit AMD Elan embedded CPU.
  39           - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
  40           - "Geode GX/LX" For AMD Geode GX and LX processors.
  41           - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
  42           - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
  43           - "VIA C7" for VIA C7.
  44           - "Intel P4" for the Pentium 4/Netburst microarchitecture.
  45           - "Core 2/newer Xeon" for all core2 and newer Intel CPUs.
  46           - "Intel Atom" for the Atom-microarchitecture CPUs.
  47           - "Generic-x86-64" for a kernel which runs on any x86-64 CPU.
  48
  49           See each option's help text for additional details. If you don't know
  50           what to do, choose "486".
  51
  52 config M486
  53         bool "486"
  54         depends on X86_32
  55         ---help---
  56           Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel
  57           486DX/DX2/DX4 or SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  58
  59 config M586
  60         bool "586/K5/5x86/6x86/6x86MX"
  61         depends on X86_32
  62         ---help---
  63           Select this for an 586 or 686 series processor such as the AMD K5,
  64           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
  65           assume the RDTSC (Read Time Stamp Counter) instruction.
  66
  67 config M586TSC
  68         bool "Pentium-Classic"
  69         depends on X86_32
  70         ---help---
  71           Select this for a Pentium Classic processor with the RDTSC (Read
  72           Time Stamp Counter) instruction for benchmarking.
  73
  74 config M586MMX
  75         bool "Pentium-MMX"
  76         depends on X86_32
  77         ---help---
  78           Select this for a Pentium with the MMX graphics/multimedia
  79           extended instructions.
  80
  81 config M686
  82         bool "Pentium-Pro"
  83         depends on X86_32
  84         ---help---
  85           Select this for Intel Pentium Pro chips.  This enables the use of
  86           Pentium Pro extended instructions, and disables the init-time guard
  87           against the f00f bug found in earlier Pentiums.
  88
  89 config MPENTIUMII
  90         bool "Pentium-II/Celeron(pre-Coppermine)"
  91         depends on X86_32
  92         ---help---
  93           Select this for Intel chips based on the Pentium-II and
  94           pre-Coppermine Celeron core.  This option enables an unaligned
  95           copy optimization, compiles the kernel with optimization flags
  96           tailored for the chip, and applies any applicable Pentium Pro
  97           optimizations.
  98
  99 config MPENTIUMIII
 100         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
 101         depends on X86_32
 102         ---help---
 103           Select this for Intel chips based on the Pentium-III and
 104           Celeron-Coppermine core.  This option enables use of some
 105           extended prefetch instructions in addition to the Pentium II
 106           extensions.
 107
 108 config MPENTIUMM
 109         bool "Pentium M"
 110         depends on X86_32
 111         ---help---
 112           Select this for Intel Pentium M (not Pentium-4 M)
 113           notebook chips.
 114
 115 config MPENTIUM4
 116         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
 117         depends on X86_32
 118         ---help---
 119           Select this for Intel Pentium 4 chips.  This includes the
 120           Pentium 4, Pentium D, P4-based Celeron and Xeon, and
 121           Pentium-4 M (not Pentium M) chips.  This option enables compile
 122           flags optimized for the chip, uses the correct cache line size, and
 123           applies any applicable optimizations.
 124
 125           CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
 126
 127           Select this for:
 128             Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
 129                 -Willamette
 130                 -Northwood
 131                 -Mobile Pentium 4
 132                 -Mobile Pentium 4 M
 133                 -Extreme Edition (Gallatin)
 134                 -Prescott
 135                 -Prescott 2M
 136                 -Cedar Mill
 137                 -Presler
 138                 -Smithfiled
 139             Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
 140                 -Foster
 141                 -Prestonia
 142                 -Gallatin
 143                 -Nocona
 144                 -Irwindale
 145                 -Cranford
 146                 -Potomac
 147                 -Paxville
 148                 -Dempsey
 149
 150
 151 config MK6
 152         bool "K6/K6-II/K6-III"
 153         depends on X86_32
 154         ---help---
 155           Select this for an AMD K6-family processor.  Enables use of
 156           some extended instructions, and passes appropriate optimization
 157           flags to GCC.
 158
 159 config MK7
 160         bool "Athlon/Duron/K7"
 161         depends on X86_32
 162         ---help---
 163           Select this for an AMD Athlon K7-family processor.  Enables use of
 164           some extended instructions, and passes appropriate optimization
 165           flags to GCC.
 166
 167 config MK8
 168         bool "Opteron/Athlon64/Hammer/K8"
 169         ---help---
 170           Select this for an AMD Opteron or Athlon64 Hammer-family processor.
 171           Enables use of some extended instructions, and passes appropriate
 172           optimization flags to GCC.
 173
 174 config MCRUSOE
 175         bool "Crusoe"
 176         depends on X86_32
 177         ---help---
 178           Select this for a Transmeta Crusoe processor.  Treats the processor
 179           like a 586 with TSC, and sets some GCC optimization flags (like a
 180           Pentium Pro with no alignment requirements).
 181
 182 config MEFFICEON
 183         bool "Efficeon"
 184         depends on X86_32
 185         ---help---
 186           Select this for a Transmeta Efficeon processor.
 187
 188 config MWINCHIPC6
 189         bool "Winchip-C6"
 190         depends on X86_32
 191         ---help---
 192           Select this for an IDT Winchip C6 chip.  Linux and GCC
 193           treat this chip as a 586TSC with some extended instructions
 194           and alignment requirements.
 195
 196 config MWINCHIP3D
 197         bool "Winchip-2/Winchip-2A/Winchip-3"
 198         depends on X86_32
 199         ---help---
 200           Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
 201           treat this chip as a 586TSC with some extended instructions
 202           and alignment requirements.  Also enable out of order memory
 203           stores for this CPU, which can increase performance of some
 204           operations.
 205
 206 config MELAN
 207         bool "AMD Elan"
 208         depends on X86_32
 209         ---help---
 210           Select this for an AMD Elan processor.
 211
 212           Do not use this option for K6/Athlon/Opteron processors!
 213
 214 config MGEODEGX1
 215         bool "GeodeGX1"
 216         depends on X86_32
 217         ---help---
 218           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 219
 220 config MGEODE_LX
 221         bool "Geode GX/LX"
 222         depends on X86_32
 223         ---help---
 224           Select this for AMD Geode GX and LX processors.
 225
 226 config MCYRIXIII
 227         bool "CyrixIII/VIA-C3"
 228         depends on X86_32
 229         ---help---
 230           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 231           treat this chip as a generic 586. Whilst the CPU is 686 class,
 232           it lacks the cmov extension which gcc assumes is present when
 233           generating 686 code.
 234           Note that Nehemiah (Model 9) and above will not boot with this
 235           kernel due to them lacking the 3DNow! instructions used in earlier
 236           incarnations of the CPU.
 237
 238 config MVIAC3_2
 239         bool "VIA C3-2 (Nehemiah)"
 240         depends on X86_32
 241         ---help---
 242           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 243           of SSE and tells gcc to treat the CPU as a 686.
 244           Note, this kernel will not boot on older (pre model 9) C3s.
 245
 246 config MVIAC7
 247         bool "VIA C7"
 248         depends on X86_32
 249         ---help---
 250           Select this for a VIA C7.  Selecting this uses the correct cache
 251           shift and tells gcc to treat the CPU as a 686.
 252
 253 config MPSC
 254         bool "Intel P4 / older Netburst based Xeon"
 255         depends on X86_64
 256         ---help---
 257           Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
 258           Xeon CPUs with Intel 64bit which is compatible with x86-64.
 259           Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
 260           Netburst core and shouldn't use this option. You can distinguish them
 261           using the cpu family field
 262           in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
 263
 264 config MCORE2
 265         bool "Core 2/newer Xeon"
 266         ---help---
 267
 268           Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
 269           53xx) CPUs. You can distinguish newer from older Xeons by the CPU
 270           family in /proc/cpuinfo. Newer ones have 6 and older ones 15
 271           (not a typo)
 272
 273 config MATOM
 274         bool "Intel Atom"
 275         ---help---
 276
 277           Select this for the Intel Atom platform. Intel Atom CPUs have an
 278           in-order pipelining architecture and thus can benefit from
 279           accordingly optimized code. Use a recent GCC with specific Atom
 280           support in order to fully benefit from selecting this option.
 281
 282 config GENERIC_CPU
 283         bool "Generic-x86-64"
 284         depends on X86_64
 285         ---help---
 286           Generic x86-64 CPU.
 287           Run equally well on all x86-64 CPUs.
 288
 289 endchoice
 290
 291 config X86_GENERIC
 292         bool "Generic x86 support"
 293         depends on X86_32
 294         ---help---
 295           Instead of just including optimizations for the selected
 296           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 297           generic optimizations as well. This will make the kernel
 298           perform better on x86 CPUs other than that selected.
 299
 300           This is really intended for distributors who need more
 301           generic optimizations.
 302
 303 #
 304 # Define implied options from the CPU selection here
 305 config X86_INTERNODE_CACHE_SHIFT
 306         int
 307         default "12" if X86_VSMP
 308         default X86_L1_CACHE_SHIFT
 309
 310 config X86_L1_CACHE_SHIFT
 311         int
 312         default "7" if MPENTIUM4 || MPSC
 313         default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
 314         default "4" if MELAN || M486 || MGEODEGX1
 315         default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 316
 317 config X86_PPRO_FENCE
 318         bool "PentiumPro memory ordering errata workaround"
 319         depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1
 320         ---help---
 321           Old PentiumPro multiprocessor systems had errata that could cause
 322           memory operations to violate the x86 ordering standard in rare cases.
 323           Enabling this option will attempt to work around some (but not all)
 324           occurrences of this problem, at the cost of much heavier spinlock and
 325           memory barrier operations.
 326
 327           If unsure, say n here. Even distro kernels should think twice before
 328           enabling this: there are few systems, and an unlikely bug.
 329
 330 config X86_F00F_BUG
 331         def_bool y
 332         depends on M586MMX || M586TSC || M586 || M486
 333
 334 config X86_INVD_BUG
 335         def_bool y
 336         depends on M486
 337
 338 config X86_ALIGNMENT_16
 339         def_bool y
 340         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 341
 342 config X86_INTEL_USERCOPY
 343         def_bool y
 344         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
 345
 346 config X86_USE_PPRO_CHECKSUM
 347         def_bool y
 348         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
 349
 350 config X86_USE_3DNOW
 351         def_bool y
 352         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 353
 354 #
 355 # P6_NOPs are a relatively minor optimization that require a family >=
 356 # 6 processor, except that it is broken on certain VIA chips.
 357 # Furthermore, AMD chips prefer a totally different sequence of NOPs
 358 # (which work on all CPUs).  In addition, it looks like Virtual PC
 359 # does not understand them.
 360 #
 361 # As a result, disallow these if we're not compiling for X86_64 (these
 362 # NOPs do work on all x86-64 capable chips); the list of processors in
 363 # the right-hand clause are the cores that benefit from this optimization.
 364 #
 365 config X86_P6_NOP
 366         def_bool y
 367         depends on X86_64
 368         depends on (MCORE2 || MPENTIUM4 || MPSC)
 369
 370 config X86_TSC
 371         def_bool y
 372         depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MATOM) || X86_64
 373
 374 config X86_CMPXCHG64
 375         def_bool y
 376         depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
 377
 378 # this should be set for all -march=.. options where the compiler
 379 # generates cmov.
 380 config X86_CMOV
 381         def_bool y
 382         depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
 383
 384 config X86_MINIMUM_CPU_FAMILY
 385         int
 386         default "64" if X86_64
 387         default "6" if X86_32 && X86_P6_NOP
 388         default "5" if X86_32 && X86_CMPXCHG64
 389         default "4"
 390
 391 config X86_DEBUGCTLMSR
 392         def_bool y
 393         depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML
 394
 395 menuconfig PROCESSOR_SELECT
 396         bool "Supported processor vendors" if EXPERT
 397         ---help---
 398           This lets you choose what x86 vendor support code your kernel
 399           will include.
 400
 401 config CPU_SUP_INTEL
 402         default y
 403         bool "Support Intel processors" if PROCESSOR_SELECT
 404         ---help---
 405           This enables detection, tunings and quirks for Intel processors
 406
 407           You need this enabled if you want your kernel to run on an
 408           Intel CPU. Disabling this option on other types of CPUs
 409           makes the kernel a tiny bit smaller. Disabling it on an Intel
 410           CPU might render the kernel unbootable.
 411
 412           If unsure, say N.
 413
 414 config CPU_SUP_CYRIX_32
 415         default y
 416         bool "Support Cyrix processors" if PROCESSOR_SELECT
 417         depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
 418         ---help---
 419           This enables detection, tunings and quirks for Cyrix processors
 420
 421           You need this enabled if you want your kernel to run on a
 422           Cyrix CPU. Disabling this option on other types of CPUs
 423           makes the kernel a tiny bit smaller. Disabling it on a Cyrix
 424           CPU might render the kernel unbootable.
 425
 426           If unsure, say N.
 427
 428 config CPU_SUP_AMD
 429         default y
 430         bool "Support AMD processors" if PROCESSOR_SELECT
 431         ---help---
 432           This enables detection, tunings and quirks for AMD processors
 433
 434           You need this enabled if you want your kernel to run on an
 435           AMD CPU. Disabling this option on other types of CPUs
 436           makes the kernel a tiny bit smaller. Disabling it on an AMD
 437           CPU might render the kernel unbootable.
 438
 439           If unsure, say N.
 440
 441 config CPU_SUP_CENTAUR
 442         default y
 443         bool "Support Centaur processors" if PROCESSOR_SELECT
 444         ---help---
 445           This enables detection, tunings and quirks for Centaur processors
 446
 447           You need this enabled if you want your kernel to run on a
 448           Centaur CPU. Disabling this option on other types of CPUs
 449           makes the kernel a tiny bit smaller. Disabling it on a Centaur
 450           CPU might render the kernel unbootable.
 451
 452           If unsure, say N.
 453
 454 config CPU_SUP_TRANSMETA_32
 455         default y
 456         bool "Support Transmeta processors" if PROCESSOR_SELECT
 457         depends on !64BIT
 458         ---help---
 459           This enables detection, tunings and quirks for Transmeta processors
 460
 461           You need this enabled if you want your kernel to run on a
 462           Transmeta CPU. Disabling this option on other types of CPUs
 463           makes the kernel a tiny bit smaller. Disabling it on a Transmeta
 464           CPU might render the kernel unbootable.
 465
 466           If unsure, say N.
 467
 468 config CPU_SUP_UMC_32
 469         default y
 470         bool "Support UMC processors" if PROCESSOR_SELECT
 471         depends on M486 || (EXPERT && !64BIT)
 472         ---help---
 473           This enables detection, tunings and quirks for UMC processors
 474
 475           You need this enabled if you want your kernel to run on a
 476           UMC CPU. Disabling this option on other types of CPUs
 477           makes the kernel a tiny bit smaller. Disabling it on a UMC
 478           CPU might render the kernel unbootable.
 479
 480           If unsure, say N.