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 M486 54 bool "486" 55 depends on X86_32 56 ---help--- 57 Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel 58 486DX/DX2/DX4 or SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. 59 60config M586 61 bool "586/K5/5x86/6x86/6x86MX" 62 depends on X86_32 63 ---help--- 64 Select this for an 586 or 686 series processor such as the AMD K5, 65 the Cyrix 5x86, 6x86 and 6x86MX. This choice does not 66 assume the RDTSC (Read Time Stamp Counter) instruction. 67 68config M586TSC 69 bool "Pentium-Classic" 70 depends on X86_32 71 ---help--- 72 Select this for a Pentium Classic processor with the RDTSC (Read 73 Time Stamp Counter) instruction for benchmarking. 74 75config M586MMX 76 bool "Pentium-MMX" 77 depends on X86_32 78 ---help--- 79 Select this for a Pentium with the MMX graphics/multimedia 80 extended instructions. 81 82config M686 83 bool "Pentium-Pro" 84 depends on X86_32 85 ---help--- 86 Select this for Intel Pentium Pro chips. This enables the use of 87 Pentium Pro extended instructions, and disables the init-time guard 88 against the f00f bug found in earlier Pentiums. 89 90config MPENTIUMII 91 bool "Pentium-II/Celeron(pre-Coppermine)" 92 depends on X86_32 93 ---help--- 94 Select this for Intel chips based on the Pentium-II and 95 pre-Coppermine Celeron core. This option enables an unaligned 96 copy optimization, compiles the kernel with optimization flags 97 tailored for the chip, and applies any applicable Pentium Pro 98 optimizations. 99 100config MPENTIUMIII 101 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon" 102 depends on X86_32 103 ---help--- 104 Select this for Intel chips based on the Pentium-III and 105 Celeron-Coppermine core. This option enables use of some 106 extended prefetch instructions in addition to the Pentium II 107 extensions. 108 109config MPENTIUMM 110 bool "Pentium M" 111 depends on X86_32 112 ---help--- 113 Select this for Intel Pentium M (not Pentium-4 M) 114 notebook chips. 115 116config MPENTIUM4 117 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" 118 depends on X86_32 119 ---help--- 120 Select this for Intel Pentium 4 chips. This includes the 121 Pentium 4, Pentium D, P4-based Celeron and Xeon, and 122 Pentium-4 M (not Pentium M) chips. This option enables compile 123 flags optimized for the chip, uses the correct cache line size, and 124 applies any applicable optimizations. 125 126 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 ) 127 128 Select this for: 129 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename: 130 -Willamette 131 -Northwood 132 -Mobile Pentium 4 133 -Mobile Pentium 4 M 134 -Extreme Edition (Gallatin) 135 -Prescott 136 -Prescott 2M 137 -Cedar Mill 138 -Presler 139 -Smithfiled 140 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename: 141 -Foster 142 -Prestonia 143 -Gallatin 144 -Nocona 145 -Irwindale 146 -Cranford 147 -Potomac 148 -Paxville 149 -Dempsey 150 151 152config MK6 153 bool "K6/K6-II/K6-III" 154 depends on X86_32 155 ---help--- 156 Select this for an AMD K6-family processor. Enables use of 157 some extended instructions, and passes appropriate optimization 158 flags to GCC. 159 160config MK7 161 bool "Athlon/Duron/K7" 162 depends on X86_32 163 ---help--- 164 Select this for an AMD Athlon K7-family processor. Enables use of 165 some extended instructions, and passes appropriate optimization 166 flags to GCC. 167 168config MK8 169 bool "Opteron/Athlon64/Hammer/K8" 170 ---help--- 171 Select this for an AMD Opteron or Athlon64 Hammer-family processor. 172 Enables use of some extended instructions, and passes appropriate 173 optimization flags to GCC. 174 175config MCRUSOE 176 bool "Crusoe" 177 depends on X86_32 178 ---help--- 179 Select this for a Transmeta Crusoe processor. Treats the processor 180 like a 586 with TSC, and sets some GCC optimization flags (like a 181 Pentium Pro with no alignment requirements). 182 183config MEFFICEON 184 bool "Efficeon" 185 depends on X86_32 186 ---help--- 187 Select this for a Transmeta Efficeon processor. 188 189config MWINCHIPC6 190 bool "Winchip-C6" 191 depends on X86_32 192 ---help--- 193 Select this for an IDT Winchip C6 chip. Linux and GCC 194 treat this chip as a 586TSC with some extended instructions 195 and alignment requirements. 196 197config MWINCHIP3D 198 bool "Winchip-2/Winchip-2A/Winchip-3" 199 depends on X86_32 200 ---help--- 201 Select this for an IDT Winchip-2, 2A or 3. Linux and GCC 202 treat this chip as a 586TSC with some extended instructions 203 and alignment requirements. Also enable out of order memory 204 stores for this CPU, which can increase performance of some 205 operations. 206 207config MELAN 208 bool "AMD Elan" 209 depends on X86_32 210 ---help--- 211 Select this for an AMD Elan processor. 212 213 Do not use this option for K6/Athlon/Opteron processors! 214 215config MGEODEGX1 216 bool "GeodeGX1" 217 depends on X86_32 218 ---help--- 219 Select this for a Geode GX1 (Cyrix MediaGX) chip. 220 221config MGEODE_LX 222 bool "Geode GX/LX" 223 depends on X86_32 224 ---help--- 225 Select this for AMD Geode GX and LX processors. 226 227config MCYRIXIII 228 bool "CyrixIII/VIA-C3" 229 depends on X86_32 230 ---help--- 231 Select this for a Cyrix III or C3 chip. Presently Linux and GCC 232 treat this chip as a generic 586. Whilst the CPU is 686 class, 233 it lacks the cmov extension which gcc assumes is present when 234 generating 686 code. 235 Note that Nehemiah (Model 9) and above will not boot with this 236 kernel due to them lacking the 3DNow! instructions used in earlier 237 incarnations of the CPU. 238 239config MVIAC3_2 240 bool "VIA C3-2 (Nehemiah)" 241 depends on X86_32 242 ---help--- 243 Select this for a VIA C3 "Nehemiah". Selecting this enables usage 244 of SSE and tells gcc to treat the CPU as a 686. 245 Note, this kernel will not boot on older (pre model 9) C3s. 246 247config MVIAC7 248 bool "VIA C7" 249 depends on X86_32 250 ---help--- 251 Select this for a VIA C7. Selecting this uses the correct cache 252 shift and tells gcc to treat the CPU as a 686. 253 254config MPSC 255 bool "Intel P4 / older Netburst based Xeon" 256 depends on X86_64 257 ---help--- 258 Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey 259 Xeon CPUs with Intel 64bit which is compatible with x86-64. 260 Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the 261 Netburst core and shouldn't use this option. You can distinguish them 262 using the cpu family field 263 in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. 264 265config MCORE2 266 bool "Core 2/newer Xeon" 267 ---help--- 268 269 Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 270 53xx) CPUs. You can distinguish newer from older Xeons by the CPU 271 family in /proc/cpuinfo. Newer ones have 6 and older ones 15 272 (not a typo) 273 274config MATOM 275 bool "Intel Atom" 276 ---help--- 277 278 Select this for the Intel Atom platform. Intel Atom CPUs have an 279 in-order pipelining architecture and thus can benefit from 280 accordingly optimized code. Use a recent GCC with specific Atom 281 support in order to fully benefit from selecting this option. 282 283config GENERIC_CPU 284 bool "Generic-x86-64" 285 depends on X86_64 286 ---help--- 287 Generic x86-64 CPU. 288 Run equally well on all x86-64 CPUs. 289 290endchoice 291 292config X86_GENERIC 293 bool "Generic x86 support" 294 depends on X86_32 295 ---help--- 296 Instead of just including optimizations for the selected 297 x86 variant (e.g. PII, Crusoe or Athlon), include some more 298 generic optimizations as well. This will make the kernel 299 perform better on x86 CPUs other than that selected. 300 301 This is really intended for distributors who need more 302 generic optimizations. 303 304# 305# Define implied options from the CPU selection here 306config X86_INTERNODE_CACHE_SHIFT 307 int 308 default "12" if X86_VSMP 309 default X86_L1_CACHE_SHIFT 310 311config X86_L1_CACHE_SHIFT 312 int 313 default "7" if MPENTIUM4 || MPSC 314 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU 315 default "4" if MELAN || M486 || MGEODEGX1 316 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX 317 318config X86_F00F_BUG 319 def_bool y 320 depends on M586MMX || M586TSC || M586 || M486 321 322config X86_INVD_BUG 323 def_bool y 324 depends on M486 325 326config X86_ALIGNMENT_16 327 def_bool y 328 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1 329 330config X86_INTEL_USERCOPY 331 def_bool y 332 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 333 334config X86_USE_PPRO_CHECKSUM 335 def_bool y 336 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM 337 338config X86_USE_3DNOW 339 def_bool y 340 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML 341 342# 343# P6_NOPs are a relatively minor optimization that require a family >= 344# 6 processor, except that it is broken on certain VIA chips. 345# Furthermore, AMD chips prefer a totally different sequence of NOPs 346# (which work on all CPUs). In addition, it looks like Virtual PC 347# does not understand them. 348# 349# As a result, disallow these if we're not compiling for X86_64 (these 350# NOPs do work on all x86-64 capable chips); the list of processors in 351# the right-hand clause are the cores that benefit from this optimization. 352# 353config X86_P6_NOP 354 def_bool y 355 depends on X86_64 356 depends on (MCORE2 || MPENTIUM4 || MPSC) 357 358config X86_TSC 359 def_bool y 360 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_64 361 362config X86_CMPXCHG64 363 def_bool y 364 depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586TSC || M586MMX || MATOM || MGEODE_LX || MGEODEGX1 || MK6 || MK7 || MK8 365 366# this should be set for all -march=.. options where the compiler 367# generates cmov. 368config X86_CMOV 369 def_bool y 370 depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) 371 372config X86_MINIMUM_CPU_FAMILY 373 int 374 default "64" if X86_64 375 default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MCRUSOE || MCORE2 || MK7 || MK8) 376 default "5" if X86_32 && X86_CMPXCHG64 377 default "4" 378 379config X86_DEBUGCTLMSR 380 def_bool y 381 depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML 382 383menuconfig PROCESSOR_SELECT 384 bool "Supported processor vendors" if EXPERT 385 ---help--- 386 This lets you choose what x86 vendor support code your kernel 387 will include. 388 389config CPU_SUP_INTEL 390 default y 391 bool "Support Intel processors" if PROCESSOR_SELECT 392 ---help--- 393 This enables detection, tunings and quirks for Intel processors 394 395 You need this enabled if you want your kernel to run on an 396 Intel CPU. Disabling this option on other types of CPUs 397 makes the kernel a tiny bit smaller. Disabling it on an Intel 398 CPU might render the kernel unbootable. 399 400 If unsure, say N. 401 402config CPU_SUP_CYRIX_32 403 default y 404 bool "Support Cyrix processors" if PROCESSOR_SELECT 405 depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT) 406 ---help--- 407 This enables detection, tunings and quirks for Cyrix processors 408 409 You need this enabled if you want your kernel to run on a 410 Cyrix CPU. Disabling this option on other types of CPUs 411 makes the kernel a tiny bit smaller. Disabling it on a Cyrix 412 CPU might render the kernel unbootable. 413 414 If unsure, say N. 415 416config CPU_SUP_AMD 417 default y 418 bool "Support AMD processors" if PROCESSOR_SELECT 419 ---help--- 420 This enables detection, tunings and quirks for AMD processors 421 422 You need this enabled if you want your kernel to run on an 423 AMD CPU. Disabling this option on other types of CPUs 424 makes the kernel a tiny bit smaller. Disabling it on an AMD 425 CPU might render the kernel unbootable. 426 427 If unsure, say N. 428 429config CPU_SUP_HYGON 430 default y 431 bool "Support Hygon processors" if PROCESSOR_SELECT 432 select CPU_SUP_AMD 433 help 434 This enables detection, tunings and quirks for Hygon processors 435 436 You need this enabled if you want your kernel to run on an 437 Hygon CPU. Disabling this option on other types of CPUs 438 makes the kernel a tiny bit smaller. Disabling it on an Hygon 439 CPU might render the kernel unbootable. 440 441 If unsure, say N. 442 443config CPU_SUP_CENTAUR 444 default y 445 bool "Support Centaur processors" if PROCESSOR_SELECT 446 ---help--- 447 This enables detection, tunings and quirks for Centaur processors 448 449 You need this enabled if you want your kernel to run on a 450 Centaur CPU. Disabling this option on other types of CPUs 451 makes the kernel a tiny bit smaller. Disabling it on a Centaur 452 CPU might render the kernel unbootable. 453 454 If unsure, say N. 455 456config CPU_SUP_TRANSMETA_32 457 default y 458 bool "Support Transmeta processors" if PROCESSOR_SELECT 459 depends on !64BIT 460 ---help--- 461 This enables detection, tunings and quirks for Transmeta processors 462 463 You need this enabled if you want your kernel to run on a 464 Transmeta CPU. Disabling this option on other types of CPUs 465 makes the kernel a tiny bit smaller. Disabling it on a Transmeta 466 CPU might render the kernel unbootable. 467 468 If unsure, say N. 469 470config CPU_SUP_UMC_32 471 default y 472 bool "Support UMC processors" if PROCESSOR_SELECT 473 depends on M486 || (EXPERT && !64BIT) 474 ---help--- 475 This enables detection, tunings and quirks for UMC processors 476 477 You need this enabled if you want your kernel to run on a 478 UMC CPU. Disabling this option on other types of CPUs 479 makes the kernel a tiny bit smaller. Disabling it on a UMC 480 CPU might render the kernel unbootable. 481 482 If unsure, say N. 483