Kconfig.cpu (16915B)
1# SPDX-License-Identifier: GPL-2.0 2# Put here option for CPU selection and depending optimization 3choice 4 prompt "Processor family" 5 default M686 if X86_32 6 default GENERIC_CPU if X86_64 7 help 8 This is the processor type of your CPU. This information is 9 used for optimizing purposes. In order to compile a kernel 10 that can run on all supported x86 CPU types (albeit not 11 optimally fast), you can specify "486" here. 12 13 Note that the 386 is no longer supported, this includes 14 AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2, 15 UMC 486SX-S and the NexGen Nx586. 16 17 The kernel will not necessarily run on earlier architectures than 18 the one you have chosen, e.g. a Pentium optimized kernel will run on 19 a PPro, but not necessarily on a i486. 20 21 Here are the settings recommended for greatest speed: 22 - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or 23 SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. 24 - "586" for generic Pentium CPUs lacking the TSC 25 (time stamp counter) register. 26 - "Pentium-Classic" for the Intel Pentium. 27 - "Pentium-MMX" for the Intel Pentium MMX. 28 - "Pentium-Pro" for the Intel Pentium Pro. 29 - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. 30 - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. 31 - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. 32 - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). 33 - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). 34 - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs. 35 - "Crusoe" for the Transmeta Crusoe series. 36 - "Efficeon" for the Transmeta Efficeon series. 37 - "Winchip-C6" for original IDT Winchip. 38 - "Winchip-2" for IDT Winchips with 3dNow! capabilities. 39 - "AMD Elan" for the 32-bit AMD Elan embedded CPU. 40 - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). 41 - "Geode GX/LX" For AMD Geode GX and LX processors. 42 - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. 43 - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). 44 - "VIA C7" for VIA C7. 45 - "Intel P4" for the Pentium 4/Netburst microarchitecture. 46 - "Core 2/newer Xeon" for all core2 and newer Intel CPUs. 47 - "Intel Atom" for the Atom-microarchitecture CPUs. 48 - "Generic-x86-64" for a kernel which runs on any x86-64 CPU. 49 50 See each option's help text for additional details. If you don't know 51 what to do, choose "486". 52 53config M486SX 54 bool "486SX" 55 depends on X86_32 56 help 57 Select this for an 486-class CPU without an FPU such as 58 AMD/Cyrix/IBM/Intel SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5S. 59 60config M486 61 bool "486DX" 62 depends on X86_32 63 help 64 Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel 65 486DX/DX2/DX4 and UMC U5D. 66 67config M586 68 bool "586/K5/5x86/6x86/6x86MX" 69 depends on X86_32 70 help 71 Select this for an 586 or 686 series processor such as the AMD K5, 72 the Cyrix 5x86, 6x86 and 6x86MX. This choice does not 73 assume the RDTSC (Read Time Stamp Counter) instruction. 74 75config M586TSC 76 bool "Pentium-Classic" 77 depends on X86_32 78 help 79 Select this for a Pentium Classic processor with the RDTSC (Read 80 Time Stamp Counter) instruction for benchmarking. 81 82config M586MMX 83 bool "Pentium-MMX" 84 depends on X86_32 85 help 86 Select this for a Pentium with the MMX graphics/multimedia 87 extended instructions. 88 89config M686 90 bool "Pentium-Pro" 91 depends on X86_32 92 help 93 Select this for Intel Pentium Pro chips. This enables the use of 94 Pentium Pro extended instructions, and disables the init-time guard 95 against the f00f bug found in earlier Pentiums. 96 97config MPENTIUMII 98 bool "Pentium-II/Celeron(pre-Coppermine)" 99 depends on X86_32 100 help 101 Select this for Intel chips based on the Pentium-II and 102 pre-Coppermine Celeron core. This option enables an unaligned 103 copy optimization, compiles the kernel with optimization flags 104 tailored for the chip, and applies any applicable Pentium Pro 105 optimizations. 106 107config MPENTIUMIII 108 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon" 109 depends on X86_32 110 help 111 Select this for Intel chips based on the Pentium-III and 112 Celeron-Coppermine core. This option enables use of some 113 extended prefetch instructions in addition to the Pentium II 114 extensions. 115 116config MPENTIUMM 117 bool "Pentium M" 118 depends on X86_32 119 help 120 Select this for Intel Pentium M (not Pentium-4 M) 121 notebook chips. 122 123config MPENTIUM4 124 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" 125 depends on X86_32 126 help 127 Select this for Intel Pentium 4 chips. This includes the 128 Pentium 4, Pentium D, P4-based Celeron and Xeon, and 129 Pentium-4 M (not Pentium M) chips. This option enables compile 130 flags optimized for the chip, uses the correct cache line size, and 131 applies any applicable optimizations. 132 133 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 ) 134 135 Select this for: 136 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename: 137 -Willamette 138 -Northwood 139 -Mobile Pentium 4 140 -Mobile Pentium 4 M 141 -Extreme Edition (Gallatin) 142 -Prescott 143 -Prescott 2M 144 -Cedar Mill 145 -Presler 146 -Smithfiled 147 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename: 148 -Foster 149 -Prestonia 150 -Gallatin 151 -Nocona 152 -Irwindale 153 -Cranford 154 -Potomac 155 -Paxville 156 -Dempsey 157 158 159config MK6 160 bool "K6/K6-II/K6-III" 161 depends on X86_32 162 help 163 Select this for an AMD K6-family processor. Enables use of 164 some extended instructions, and passes appropriate optimization 165 flags to GCC. 166 167config MK7 168 bool "Athlon/Duron/K7" 169 depends on X86_32 170 help 171 Select this for an AMD Athlon K7-family processor. Enables use of 172 some extended instructions, and passes appropriate optimization 173 flags to GCC. 174 175config MK8 176 bool "Opteron/Athlon64/Hammer/K8" 177 help 178 Select this for an AMD Opteron or Athlon64 Hammer-family processor. 179 Enables use of some extended instructions, and passes appropriate 180 optimization flags to GCC. 181 182config MCRUSOE 183 bool "Crusoe" 184 depends on X86_32 185 help 186 Select this for a Transmeta Crusoe processor. Treats the processor 187 like a 586 with TSC, and sets some GCC optimization flags (like a 188 Pentium Pro with no alignment requirements). 189 190config MEFFICEON 191 bool "Efficeon" 192 depends on X86_32 193 help 194 Select this for a Transmeta Efficeon processor. 195 196config MWINCHIPC6 197 bool "Winchip-C6" 198 depends on X86_32 199 help 200 Select this for an IDT Winchip C6 chip. Linux and GCC 201 treat this chip as a 586TSC with some extended instructions 202 and alignment requirements. 203 204config MWINCHIP3D 205 bool "Winchip-2/Winchip-2A/Winchip-3" 206 depends on X86_32 207 help 208 Select this for an IDT Winchip-2, 2A or 3. Linux and GCC 209 treat this chip as a 586TSC with some extended instructions 210 and alignment requirements. Also enable out of order memory 211 stores for this CPU, which can increase performance of some 212 operations. 213 214config MELAN 215 bool "AMD Elan" 216 depends on X86_32 217 help 218 Select this for an AMD Elan processor. 219 220 Do not use this option for K6/Athlon/Opteron processors! 221 222config MGEODEGX1 223 bool "GeodeGX1" 224 depends on X86_32 225 help 226 Select this for a Geode GX1 (Cyrix MediaGX) chip. 227 228config MGEODE_LX 229 bool "Geode GX/LX" 230 depends on X86_32 231 help 232 Select this for AMD Geode GX and LX processors. 233 234config MCYRIXIII 235 bool "CyrixIII/VIA-C3" 236 depends on X86_32 237 help 238 Select this for a Cyrix III or C3 chip. Presently Linux and GCC 239 treat this chip as a generic 586. Whilst the CPU is 686 class, 240 it lacks the cmov extension which gcc assumes is present when 241 generating 686 code. 242 Note that Nehemiah (Model 9) and above will not boot with this 243 kernel due to them lacking the 3DNow! instructions used in earlier 244 incarnations of the CPU. 245 246config MVIAC3_2 247 bool "VIA C3-2 (Nehemiah)" 248 depends on X86_32 249 help 250 Select this for a VIA C3 "Nehemiah". Selecting this enables usage 251 of SSE and tells gcc to treat the CPU as a 686. 252 Note, this kernel will not boot on older (pre model 9) C3s. 253 254config MVIAC7 255 bool "VIA C7" 256 depends on X86_32 257 help 258 Select this for a VIA C7. Selecting this uses the correct cache 259 shift and tells gcc to treat the CPU as a 686. 260 261config MPSC 262 bool "Intel P4 / older Netburst based Xeon" 263 depends on X86_64 264 help 265 Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey 266 Xeon CPUs with Intel 64bit which is compatible with x86-64. 267 Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the 268 Netburst core and shouldn't use this option. You can distinguish them 269 using the cpu family field 270 in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. 271 272config MCORE2 273 bool "Core 2/newer Xeon" 274 help 275 276 Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 277 53xx) CPUs. You can distinguish newer from older Xeons by the CPU 278 family in /proc/cpuinfo. Newer ones have 6 and older ones 15 279 (not a typo) 280 281config MATOM 282 bool "Intel Atom" 283 help 284 285 Select this for the Intel Atom platform. Intel Atom CPUs have an 286 in-order pipelining architecture and thus can benefit from 287 accordingly optimized code. Use a recent GCC with specific Atom 288 support in order to fully benefit from selecting this option. 289 290config GENERIC_CPU 291 bool "Generic-x86-64" 292 depends on X86_64 293 help 294 Generic x86-64 CPU. 295 Run equally well on all x86-64 CPUs. 296 297endchoice 298 299config X86_GENERIC 300 bool "Generic x86 support" 301 depends on X86_32 302 help 303 Instead of just including optimizations for the selected 304 x86 variant (e.g. PII, Crusoe or Athlon), include some more 305 generic optimizations as well. This will make the kernel 306 perform better on x86 CPUs other than that selected. 307 308 This is really intended for distributors who need more 309 generic optimizations. 310 311# 312# Define implied options from the CPU selection here 313config X86_INTERNODE_CACHE_SHIFT 314 int 315 default "12" if X86_VSMP 316 default X86_L1_CACHE_SHIFT 317 318config X86_L1_CACHE_SHIFT 319 int 320 default "7" if MPENTIUM4 || MPSC 321 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU 322 default "4" if MELAN || M486SX || M486 || MGEODEGX1 323 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX 324 325config X86_F00F_BUG 326 def_bool y 327 depends on M586MMX || M586TSC || M586 || M486SX || M486 328 329config X86_INVD_BUG 330 def_bool y 331 depends on M486SX || M486 332 333config X86_ALIGNMENT_16 334 def_bool y 335 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486SX || M486 || MVIAC3_2 || MGEODEGX1 336 337config X86_INTEL_USERCOPY 338 def_bool y 339 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 340 341config X86_USE_PPRO_CHECKSUM 342 def_bool y 343 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM 344 345# 346# P6_NOPs are a relatively minor optimization that require a family >= 347# 6 processor, except that it is broken on certain VIA chips. 348# Furthermore, AMD chips prefer a totally different sequence of NOPs 349# (which work on all CPUs). In addition, it looks like Virtual PC 350# does not understand them. 351# 352# As a result, disallow these if we're not compiling for X86_64 (these 353# NOPs do work on all x86-64 capable chips); the list of processors in 354# the right-hand clause are the cores that benefit from this optimization. 355# 356config X86_P6_NOP 357 def_bool y 358 depends on X86_64 359 depends on (MCORE2 || MPENTIUM4 || MPSC) 360 361config X86_TSC 362 def_bool y 363 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_64 364 365config X86_CMPXCHG64 366 def_bool y 367 depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586TSC || M586MMX || MATOM || MGEODE_LX || MGEODEGX1 || MK6 || MK7 || MK8 368 369# this should be set for all -march=.. options where the compiler 370# generates cmov. 371config X86_CMOV 372 def_bool y 373 depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) 374 375config X86_MINIMUM_CPU_FAMILY 376 int 377 default "64" if X86_64 378 default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MCRUSOE || MCORE2 || MK7 || MK8) 379 default "5" if X86_32 && X86_CMPXCHG64 380 default "4" 381 382config X86_DEBUGCTLMSR 383 def_bool y 384 depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486SX || M486) && !UML 385 386config IA32_FEAT_CTL 387 def_bool y 388 depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR || CPU_SUP_ZHAOXIN 389 390config X86_VMX_FEATURE_NAMES 391 def_bool y 392 depends on IA32_FEAT_CTL && X86_FEATURE_NAMES 393 394menuconfig PROCESSOR_SELECT 395 bool "Supported processor vendors" if EXPERT 396 help 397 This lets you choose what x86 vendor support code your kernel 398 will include. 399 400config CPU_SUP_INTEL 401 default y 402 bool "Support Intel processors" if PROCESSOR_SELECT 403 help 404 This enables detection, tunings and quirks for Intel processors 405 406 You need this enabled if you want your kernel to run on an 407 Intel CPU. Disabling this option on other types of CPUs 408 makes the kernel a tiny bit smaller. Disabling it on an Intel 409 CPU might render the kernel unbootable. 410 411 If unsure, say N. 412 413config CPU_SUP_CYRIX_32 414 default y 415 bool "Support Cyrix processors" if PROCESSOR_SELECT 416 depends on M486SX || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT) 417 help 418 This enables detection, tunings and quirks for Cyrix processors 419 420 You need this enabled if you want your kernel to run on a 421 Cyrix CPU. Disabling this option on other types of CPUs 422 makes the kernel a tiny bit smaller. Disabling it on a Cyrix 423 CPU might render the kernel unbootable. 424 425 If unsure, say N. 426 427config CPU_SUP_AMD 428 default y 429 bool "Support AMD processors" if PROCESSOR_SELECT 430 help 431 This enables detection, tunings and quirks for AMD processors 432 433 You need this enabled if you want your kernel to run on an 434 AMD CPU. Disabling this option on other types of CPUs 435 makes the kernel a tiny bit smaller. Disabling it on an AMD 436 CPU might render the kernel unbootable. 437 438 If unsure, say N. 439 440config CPU_SUP_HYGON 441 default y 442 bool "Support Hygon processors" if PROCESSOR_SELECT 443 select CPU_SUP_AMD 444 help 445 This enables detection, tunings and quirks for Hygon processors 446 447 You need this enabled if you want your kernel to run on an 448 Hygon CPU. Disabling this option on other types of CPUs 449 makes the kernel a tiny bit smaller. Disabling it on an Hygon 450 CPU might render the kernel unbootable. 451 452 If unsure, say N. 453 454config CPU_SUP_CENTAUR 455 default y 456 bool "Support Centaur processors" if PROCESSOR_SELECT 457 help 458 This enables detection, tunings and quirks for Centaur processors 459 460 You need this enabled if you want your kernel to run on a 461 Centaur CPU. Disabling this option on other types of CPUs 462 makes the kernel a tiny bit smaller. Disabling it on a Centaur 463 CPU might render the kernel unbootable. 464 465 If unsure, say N. 466 467config CPU_SUP_TRANSMETA_32 468 default y 469 bool "Support Transmeta processors" if PROCESSOR_SELECT 470 depends on !64BIT 471 help 472 This enables detection, tunings and quirks for Transmeta processors 473 474 You need this enabled if you want your kernel to run on a 475 Transmeta CPU. Disabling this option on other types of CPUs 476 makes the kernel a tiny bit smaller. Disabling it on a Transmeta 477 CPU might render the kernel unbootable. 478 479 If unsure, say N. 480 481config CPU_SUP_UMC_32 482 default y 483 bool "Support UMC processors" if PROCESSOR_SELECT 484 depends on M486SX || M486 || (EXPERT && !64BIT) 485 help 486 This enables detection, tunings and quirks for UMC processors 487 488 You need this enabled if you want your kernel to run on a 489 UMC CPU. Disabling this option on other types of CPUs 490 makes the kernel a tiny bit smaller. Disabling it on a UMC 491 CPU might render the kernel unbootable. 492 493 If unsure, say N. 494 495config CPU_SUP_ZHAOXIN 496 default y 497 bool "Support Zhaoxin processors" if PROCESSOR_SELECT 498 help 499 This enables detection, tunings and quirks for Zhaoxin processors 500 501 You need this enabled if you want your kernel to run on a 502 Zhaoxin CPU. Disabling this option on other types of CPUs 503 makes the kernel a tiny bit smaller. Disabling it on a Zhaoxin 504 CPU might render the kernel unbootable. 505 506 If unsure, say N. 507 508config CPU_SUP_VORTEX_32 509 default y 510 bool "Support Vortex processors" if PROCESSOR_SELECT 511 depends on X86_32 512 help 513 This enables detection, tunings and quirks for Vortex processors 514 515 You need this enabled if you want your kernel to run on a 516 Vortex CPU. Disabling this option on other types of CPUs 517 makes the kernel a tiny bit smaller. 518 519 If unsure, say N.