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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.