Kconfig.cpu 15.4 KB
Newer Older
1 2 3
# Put here option for CPU selection and depending optimization
choice
	prompt "Processor family"
4 5
	default M686 if X86_32
	default GENERIC_CPU if X86_64
6

7 8 9
config M486
	bool "486"
	depends on X86_32
10
	---help---
11 12 13 14 15 16 17 18
	  This is the processor type of your CPU. This information is
	  used for optimizing purposes. In order to compile a kernel
	  that can run on all supported x86 CPU types (albeit not
	  optimally fast), you can specify "486" here.

	  Note that the 386 is no longer supported, this includes
	  AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
	  and UMC 486SX-S.
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

	  The kernel will not necessarily run on earlier architectures than
	  the one you have chosen, e.g. a Pentium optimized kernel will run on
	  a PPro, but not necessarily on a i486.

	  Here are the settings recommended for greatest speed:
	  - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
	  SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
	  - "586" for generic Pentium CPUs lacking the TSC
	  (time stamp counter) register.
	  - "Pentium-Classic" for the Intel Pentium.
	  - "Pentium-MMX" for the Intel Pentium MMX.
	  - "Pentium-Pro" for the Intel Pentium Pro.
	  - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
	  - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
	  - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
	  - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
	  - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
	  - "Crusoe" for the Transmeta Crusoe series.
	  - "Efficeon" for the Transmeta Efficeon series.
	  - "Winchip-C6" for original IDT Winchip.
40
	  - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
41
	  - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
42
	  - "Geode GX/LX" For AMD Geode GX and LX processors.
43
	  - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
Egry Gabor's avatar
Egry Gabor committed
44
	  - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
45
	  - "VIA C7" for VIA C7.
46

47
	  If you don't know what to do, choose "486".
48 49 50

config M586
	bool "586/K5/5x86/6x86/6x86MX"
51
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
52
	---help---
53 54 55 56 57 58
	  Select this for an 586 or 686 series processor such as the AMD K5,
	  the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
	  assume the RDTSC (Read Time Stamp Counter) instruction.

config M586TSC
	bool "Pentium-Classic"
59
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
60
	---help---
61 62 63 64 65
	  Select this for a Pentium Classic processor with the RDTSC (Read
	  Time Stamp Counter) instruction for benchmarking.

config M586MMX
	bool "Pentium-MMX"
66
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
67
	---help---
68 69 70 71 72
	  Select this for a Pentium with the MMX graphics/multimedia
	  extended instructions.

config M686
	bool "Pentium-Pro"
73
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
74
	---help---
75 76 77 78 79 80
	  Select this for Intel Pentium Pro chips.  This enables the use of
	  Pentium Pro extended instructions, and disables the init-time guard
	  against the f00f bug found in earlier Pentiums.

config MPENTIUMII
	bool "Pentium-II/Celeron(pre-Coppermine)"
81
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
82
	---help---
83 84 85 86 87 88 89 90
	  Select this for Intel chips based on the Pentium-II and
	  pre-Coppermine Celeron core.  This option enables an unaligned
	  copy optimization, compiles the kernel with optimization flags
	  tailored for the chip, and applies any applicable Pentium Pro
	  optimizations.

config MPENTIUMIII
	bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
91
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
92
	---help---
93 94 95 96 97 98 99
	  Select this for Intel chips based on the Pentium-III and
	  Celeron-Coppermine core.  This option enables use of some
	  extended prefetch instructions in addition to the Pentium II
	  extensions.

config MPENTIUMM
	bool "Pentium M"
100
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
101
	---help---
102 103 104 105
	  Select this for Intel Pentium M (not Pentium-4 M)
	  notebook chips.

config MPENTIUM4
106
	bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
107
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
108
	---help---
109
	  Select this for Intel Pentium 4 chips.  This includes the
110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139
	  Pentium 4, Pentium D, P4-based Celeron and Xeon, and
	  Pentium-4 M (not Pentium M) chips.  This option enables compile
	  flags optimized for the chip, uses the correct cache line size, and
	  applies any applicable optimizations.

	  CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )

	  Select this for:
	    Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
		-Willamette
		-Northwood
		-Mobile Pentium 4
		-Mobile Pentium 4 M
		-Extreme Edition (Gallatin)
		-Prescott
		-Prescott 2M
		-Cedar Mill
		-Presler
		-Smithfiled
	    Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
		-Foster
		-Prestonia
		-Gallatin
		-Nocona
		-Irwindale
		-Cranford
		-Potomac
		-Paxville
		-Dempsey

140 141 142

config MK6
	bool "K6/K6-II/K6-III"
143
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
144
	---help---
145 146 147 148 149 150
	  Select this for an AMD K6-family processor.  Enables use of
	  some extended instructions, and passes appropriate optimization
	  flags to GCC.

config MK7
	bool "Athlon/Duron/K7"
151
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
152
	---help---
153 154 155 156 157 158
	  Select this for an AMD Athlon K7-family processor.  Enables use of
	  some extended instructions, and passes appropriate optimization
	  flags to GCC.

config MK8
	bool "Opteron/Athlon64/Hammer/K8"
Ingo Molnar's avatar
Ingo Molnar committed
159
	---help---
160 161 162
	  Select this for an AMD Opteron or Athlon64 Hammer-family processor.
	  Enables use of some extended instructions, and passes appropriate
	  optimization flags to GCC.
163 164 165

config MCRUSOE
	bool "Crusoe"
166
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
167
	---help---
168 169 170 171 172 173
	  Select this for a Transmeta Crusoe processor.  Treats the processor
	  like a 586 with TSC, and sets some GCC optimization flags (like a
	  Pentium Pro with no alignment requirements).

config MEFFICEON
	bool "Efficeon"
174
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
175
	---help---
176 177 178 179
	  Select this for a Transmeta Efficeon processor.

config MWINCHIPC6
	bool "Winchip-C6"
180
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
181
	---help---
182 183 184 185 186
	  Select this for an IDT Winchip C6 chip.  Linux and GCC
	  treat this chip as a 586TSC with some extended instructions
	  and alignment requirements.

config MWINCHIP3D
187
	bool "Winchip-2/Winchip-2A/Winchip-3"
188
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
189
	---help---
190
	  Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
191
	  treat this chip as a 586TSC with some extended instructions
192
	  and alignment requirements.  Also enable out of order memory
193 194 195
	  stores for this CPU, which can increase performance of some
	  operations.

196 197 198 199 200 201 202 203
config MELAN
	bool "AMD Elan"
	depends on X86_32
	---help---
	  Select this for an AMD Elan processor.

	  Do not use this option for K6/Athlon/Opteron processors!

204 205
config MGEODEGX1
	bool "GeodeGX1"
206
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
207
	---help---
208 209
	  Select this for a Geode GX1 (Cyrix MediaGX) chip.

210
config MGEODE_LX
211
	bool "Geode GX/LX"
212
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
213
	---help---
214
	  Select this for AMD Geode GX and LX processors.
215

216 217
config MCYRIXIII
	bool "CyrixIII/VIA-C3"
218
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
219
	---help---
220 221 222 223 224 225 226 227 228 229
	  Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
	  treat this chip as a generic 586. Whilst the CPU is 686 class,
	  it lacks the cmov extension which gcc assumes is present when
	  generating 686 code.
	  Note that Nehemiah (Model 9) and above will not boot with this
	  kernel due to them lacking the 3DNow! instructions used in earlier
	  incarnations of the CPU.

config MVIAC3_2
	bool "VIA C3-2 (Nehemiah)"
230
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
231
	---help---
232 233 234 235
	  Select this for a VIA C3 "Nehemiah". Selecting this enables usage
	  of SSE and tells gcc to treat the CPU as a 686.
	  Note, this kernel will not boot on older (pre model 9) C3s.

236 237
config MVIAC7
	bool "VIA C7"
238
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
239
	---help---
240 241 242
	  Select this for a VIA C7.  Selecting this uses the correct cache
	  shift and tells gcc to treat the CPU as a 686.

243 244 245
config MPSC
	bool "Intel P4 / older Netburst based Xeon"
	depends on X86_64
Ingo Molnar's avatar
Ingo Molnar committed
246
	---help---
247 248 249
	  Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
	  Xeon CPUs with Intel 64bit which is compatible with x86-64.
	  Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
250
	  Netburst core and shouldn't use this option. You can distinguish them
251 252 253 254 255
	  using the cpu family field
	  in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.

config MCORE2
	bool "Core 2/newer Xeon"
Ingo Molnar's avatar
Ingo Molnar committed
256
	---help---
257 258 259 260 261

	  Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
	  53xx) CPUs. You can distinguish newer from older Xeons by the CPU
	  family in /proc/cpuinfo. Newer ones have 6 and older ones 15
	  (not a typo)
262

263 264 265 266 267 268 269 270 271
config MATOM
	bool "Intel Atom"
	---help---

	  Select this for the Intel Atom platform. Intel Atom CPUs have an
	  in-order pipelining architecture and thus can benefit from
	  accordingly optimized code. Use a recent GCC with specific Atom
	  support in order to fully benefit from selecting this option.

272 273 274
config GENERIC_CPU
	bool "Generic-x86-64"
	depends on X86_64
Ingo Molnar's avatar
Ingo Molnar committed
275
	---help---
276 277 278
	  Generic x86-64 CPU.
	  Run equally well on all x86-64 CPUs.

279 280 281
endchoice

config X86_GENERIC
282 283
	bool "Generic x86 support"
	depends on X86_32
Ingo Molnar's avatar
Ingo Molnar committed
284
	---help---
285 286 287 288 289 290 291 292 293 294
	  Instead of just including optimizations for the selected
	  x86 variant (e.g. PII, Crusoe or Athlon), include some more
	  generic optimizations as well. This will make the kernel
	  perform better on x86 CPUs other than that selected.

	  This is really intended for distributors who need more
	  generic optimizations.

#
# Define implied options from the CPU selection here
295
config X86_INTERNODE_CACHE_SHIFT
296
	int
297 298
	default "12" if X86_VSMP
	default X86_L1_CACHE_SHIFT
299

300
config X86_CMPXCHG
301
	def_bool y
302 303 304

config X86_L1_CACHE_SHIFT
	int
305
	default "7" if MPENTIUM4 || MPSC
306
	default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
307
	default "4" if MELAN || M486 || MGEODEGX1
308
	default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
309

310
config X86_XADD
311
	def_bool y
312 313

config X86_PPRO_FENCE
314
	bool "PentiumPro memory ordering errata workaround"
315
	depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1
Ingo Molnar's avatar
Ingo Molnar committed
316
	---help---
317 318 319
	  Old PentiumPro multiprocessor systems had errata that could cause
	  memory operations to violate the x86 ordering standard in rare cases.
	  Enabling this option will attempt to work around some (but not all)
Lucas De Marchi's avatar
Lucas De Marchi committed
320
	  occurrences of this problem, at the cost of much heavier spinlock and
321 322 323 324
	  memory barrier operations.

	  If unsure, say n here. Even distro kernels should think twice before
	  enabling this: there are few systems, and an unlikely bug.
325 326

config X86_F00F_BUG
327
	def_bool y
328
	depends on M586MMX || M586TSC || M586 || M486
329

330 331
config X86_INVD_BUG
	def_bool y
332
	depends on M486
333

334
config X86_WP_WORKS_OK
335
	def_bool y
336 337

config X86_INVLPG
338
	def_bool y
339
	depends on X86_32
340 341

config X86_BSWAP
342
	def_bool y
343
	depends on X86_32
344 345

config X86_POPAD_OK
346
	def_bool y
347
	depends on X86_32
348 349

config X86_ALIGNMENT_16
350
	def_bool y
351
	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
352 353

config X86_INTEL_USERCOPY
354
	def_bool y
355
	depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
356 357

config X86_USE_PPRO_CHECKSUM
358
	def_bool y
359
	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
360 361

config X86_USE_3DNOW
362
	def_bool y
363
	depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
364 365

config X86_OOSTORE
366
	def_bool y
367
	depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
368

369 370 371 372
#
# P6_NOPs are a relatively minor optimization that require a family >=
# 6 processor, except that it is broken on certain VIA chips.
# Furthermore, AMD chips prefer a totally different sequence of NOPs
373 374 375 376 377 378
# (which work on all CPUs).  In addition, it looks like Virtual PC
# does not understand them.
#
# As a result, disallow these if we're not compiling for X86_64 (these
# NOPs do work on all x86-64 capable chips); the list of processors in
# the right-hand clause are the cores that benefit from this optimization.
379
#
380 381
config X86_P6_NOP
	def_bool y
382 383
	depends on X86_64
	depends on (MCORE2 || MPENTIUM4 || MPSC)
384

385
config X86_TSC
386
	def_bool y
387
	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_NUMAQ) || X86_64
388

389 390
config X86_CMPXCHG64
	def_bool y
391
	depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
392

393 394 395
# this should be set for all -march=.. options where the compiler
# generates cmov.
config X86_CMOV
396
	def_bool y
Matteo Croce's avatar
Matteo Croce committed
397
	depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
398

399
config X86_MINIMUM_CPU_FAMILY
400
	int
401
	default "64" if X86_64
402
	default "6" if X86_32 && X86_P6_NOP
403
	default "5" if X86_32 && X86_CMPXCHG64
404
	default "4"
405

Roland McGrath's avatar
Roland McGrath committed
406
config X86_DEBUGCTLMSR
407
	def_bool y
408
	depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML
409 410

menuconfig PROCESSOR_SELECT
411
	bool "Supported processor vendors" if EXPERT
Ingo Molnar's avatar
Ingo Molnar committed
412
	---help---
413 414 415
	  This lets you choose what x86 vendor support code your kernel
	  will include.

Yinghai Lu's avatar
Yinghai Lu committed
416
config CPU_SUP_INTEL
417 418
	default y
	bool "Support Intel processors" if PROCESSOR_SELECT
Ingo Molnar's avatar
Ingo Molnar committed
419
	---help---
420 421 422 423 424 425 426 427
	  This enables detection, tunings and quirks for Intel processors

	  You need this enabled if you want your kernel to run on an
	  Intel CPU. Disabling this option on other types of CPUs
	  makes the kernel a tiny bit smaller. Disabling it on an Intel
	  CPU might render the kernel unbootable.

	  If unsure, say N.
428 429 430 431

config CPU_SUP_CYRIX_32
	default y
	bool "Support Cyrix processors" if PROCESSOR_SELECT
432
	depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
Ingo Molnar's avatar
Ingo Molnar committed
433
	---help---
434 435 436 437 438 439 440 441
	  This enables detection, tunings and quirks for Cyrix processors

	  You need this enabled if you want your kernel to run on a
	  Cyrix CPU. Disabling this option on other types of CPUs
	  makes the kernel a tiny bit smaller. Disabling it on a Cyrix
	  CPU might render the kernel unbootable.

	  If unsure, say N.
442

Yinghai Lu's avatar
Yinghai Lu committed
443
config CPU_SUP_AMD
444 445
	default y
	bool "Support AMD processors" if PROCESSOR_SELECT
Ingo Molnar's avatar
Ingo Molnar committed
446
	---help---
447 448 449 450 451 452 453 454
	  This enables detection, tunings and quirks for AMD processors

	  You need this enabled if you want your kernel to run on an
	  AMD CPU. Disabling this option on other types of CPUs
	  makes the kernel a tiny bit smaller. Disabling it on an AMD
	  CPU might render the kernel unbootable.

	  If unsure, say N.
455

456
config CPU_SUP_CENTAUR
457 458
	default y
	bool "Support Centaur processors" if PROCESSOR_SELECT
Ingo Molnar's avatar
Ingo Molnar committed
459
	---help---
460 461 462 463 464 465 466 467
	  This enables detection, tunings and quirks for Centaur processors

	  You need this enabled if you want your kernel to run on a
	  Centaur CPU. Disabling this option on other types of CPUs
	  makes the kernel a tiny bit smaller. Disabling it on a Centaur
	  CPU might render the kernel unbootable.

	  If unsure, say N.
468 469 470 471 472

config CPU_SUP_TRANSMETA_32
	default y
	bool "Support Transmeta processors" if PROCESSOR_SELECT
	depends on !64BIT
Ingo Molnar's avatar
Ingo Molnar committed
473
	---help---
474 475 476 477 478 479 480 481
	  This enables detection, tunings and quirks for Transmeta processors

	  You need this enabled if you want your kernel to run on a
	  Transmeta CPU. Disabling this option on other types of CPUs
	  makes the kernel a tiny bit smaller. Disabling it on a Transmeta
	  CPU might render the kernel unbootable.

	  If unsure, say N.
482 483 484 485

config CPU_SUP_UMC_32
	default y
	bool "Support UMC processors" if PROCESSOR_SELECT
486
	depends on M486 || (EXPERT && !64BIT)
Ingo Molnar's avatar
Ingo Molnar committed
487
	---help---
488 489 490 491 492 493 494 495
	  This enables detection, tunings and quirks for UMC processors

	  You need this enabled if you want your kernel to run on a
	  UMC CPU. Disabling this option on other types of CPUs
	  makes the kernel a tiny bit smaller. Disabling it on a UMC
	  CPU might render the kernel unbootable.

	  If unsure, say N.