xref: /openbmc/linux/arch/x86/Kconfig.cpu (revision 6fa24b41) 
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 || 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
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.
520