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1 | # Put here option for CPU selection and depending optimization |
2 | if !X86_ELAN | |
3 | ||
4 | choice | |
5 | prompt "Processor family" | |
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6 | default M686 if X86_32 |
7 | default GENERIC_CPU if X86_64 | |
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8 | |
9 | config M386 | |
10 | bool "386" | |
1032c0ba | 11 | depends on X86_32 && !UML |
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12 | ---help--- |
13 | This is the processor type of your CPU. This information is used for | |
14 | optimizing purposes. In order to compile a kernel that can run on | |
15 | all x86 CPU types (albeit not optimally fast), you can specify | |
16 | "386" here. | |
17 | ||
18 | The kernel will not necessarily run on earlier architectures than | |
19 | the one you have chosen, e.g. a Pentium optimized kernel will run on | |
20 | a PPro, but not necessarily on a i486. | |
21 | ||
22 | Here are the settings recommended for greatest speed: | |
23 | - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI | |
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24 | 486DLC/DLC2, and UMC 486SX-S. Only "386" kernels will run on a 386 |
25 | class machine. | |
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26 | - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or |
27 | SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. | |
28 | - "586" for generic Pentium CPUs lacking the TSC | |
29 | (time stamp counter) register. | |
30 | - "Pentium-Classic" for the Intel Pentium. | |
31 | - "Pentium-MMX" for the Intel Pentium MMX. | |
32 | - "Pentium-Pro" for the Intel Pentium Pro. | |
33 | - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. | |
34 | - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. | |
35 | - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. | |
36 | - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). | |
37 | - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). | |
38 | - "Crusoe" for the Transmeta Crusoe series. | |
39 | - "Efficeon" for the Transmeta Efficeon series. | |
40 | - "Winchip-C6" for original IDT Winchip. | |
69d45dd1 | 41 | - "Winchip-2" for IDT Winchips with 3dNow! capabilities. |
96d55b88 | 42 | - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). |
f90b8116 | 43 | - "Geode GX/LX" For AMD Geode GX and LX processors. |
96d55b88 | 44 | - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. |
48a1204c | 45 | - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). |
0949be35 | 46 | - "VIA C7" for VIA C7. |
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47 | |
48 | If you don't know what to do, choose "386". | |
49 | ||
50 | config M486 | |
51 | bool "486" | |
1032c0ba | 52 | depends on X86_32 |
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53 | help |
54 | Select this for a 486 series processor, either Intel or one of the | |
55 | compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX, | |
56 | DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or | |
57 | U5S. | |
58 | ||
59 | config M586 | |
60 | bool "586/K5/5x86/6x86/6x86MX" | |
1032c0ba | 61 | depends on X86_32 |
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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" | |
1032c0ba | 69 | depends on X86_32 |
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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" | |
1032c0ba | 76 | depends on X86_32 |
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77 | help |
78 | Select this for a Pentium with the MMX graphics/multimedia | |
79 | extended instructions. | |
80 | ||
81 | config M686 | |
82 | bool "Pentium-Pro" | |
1032c0ba | 83 | depends on X86_32 |
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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)" | |
1032c0ba | 91 | depends on X86_32 |
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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" | |
1032c0ba | 101 | depends on X86_32 |
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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" | |
1032c0ba | 110 | depends on X86_32 |
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111 | help |
112 | Select this for Intel Pentium M (not Pentium-4 M) | |
113 | notebook chips. | |
114 | ||
115 | config MPENTIUM4 | |
c55d92d1 | 116 | bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" |
1032c0ba | 117 | depends on X86_32 |
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118 | help |
119 | Select this for Intel Pentium 4 chips. This includes the | |
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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 | ||
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150 | |
151 | config MK6 | |
152 | bool "K6/K6-II/K6-III" | |
1032c0ba | 153 | depends on X86_32 |
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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" | |
1032c0ba | 161 | depends on X86_32 |
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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. Enables | |
171 | use of some extended instructions, and passes appropriate optimization | |
172 | flags to GCC. | |
173 | ||
174 | config MCRUSOE | |
175 | bool "Crusoe" | |
1032c0ba | 176 | depends on X86_32 |
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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" | |
1032c0ba | 184 | depends on X86_32 |
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185 | help |
186 | Select this for a Transmeta Efficeon processor. | |
187 | ||
188 | config MWINCHIPC6 | |
189 | bool "Winchip-C6" | |
1032c0ba | 190 | depends on X86_32 |
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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 | ||
96d55b88 | 196 | config MWINCHIP3D |
69d45dd1 | 197 | bool "Winchip-2/Winchip-2A/Winchip-3" |
1032c0ba | 198 | depends on X86_32 |
96d55b88 | 199 | help |
69d45dd1 | 200 | Select this for an IDT Winchip-2, 2A or 3. Linux and GCC |
96d55b88 | 201 | treat this chip as a 586TSC with some extended instructions |
3dde6ad8 | 202 | and alignment requirements. Also enable out of order memory |
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203 | stores for this CPU, which can increase performance of some |
204 | operations. | |
205 | ||
206 | config MGEODEGX1 | |
207 | bool "GeodeGX1" | |
1032c0ba | 208 | depends on X86_32 |
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209 | help |
210 | Select this for a Geode GX1 (Cyrix MediaGX) chip. | |
211 | ||
f90b8116 | 212 | config MGEODE_LX |
96daa8cd | 213 | bool "Geode GX/LX" |
1032c0ba | 214 | depends on X86_32 |
96daa8cd HH |
215 | help |
216 | Select this for AMD Geode GX and LX processors. | |
f90b8116 | 217 | |
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218 | config MCYRIXIII |
219 | bool "CyrixIII/VIA-C3" | |
1032c0ba | 220 | depends on X86_32 |
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221 | help |
222 | Select this for a Cyrix III or C3 chip. Presently Linux and GCC | |
223 | treat this chip as a generic 586. Whilst the CPU is 686 class, | |
224 | it lacks the cmov extension which gcc assumes is present when | |
225 | generating 686 code. | |
226 | Note that Nehemiah (Model 9) and above will not boot with this | |
227 | kernel due to them lacking the 3DNow! instructions used in earlier | |
228 | incarnations of the CPU. | |
229 | ||
230 | config MVIAC3_2 | |
231 | bool "VIA C3-2 (Nehemiah)" | |
1032c0ba | 232 | depends on X86_32 |
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233 | help |
234 | Select this for a VIA C3 "Nehemiah". Selecting this enables usage | |
235 | of SSE and tells gcc to treat the CPU as a 686. | |
236 | Note, this kernel will not boot on older (pre model 9) C3s. | |
237 | ||
0949be35 SA |
238 | config MVIAC7 |
239 | bool "VIA C7" | |
1032c0ba | 240 | depends on X86_32 |
0949be35 SA |
241 | help |
242 | Select this for a VIA C7. Selecting this uses the correct cache | |
243 | shift and tells gcc to treat the CPU as a 686. | |
244 | ||
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245 | config MPSC |
246 | bool "Intel P4 / older Netburst based Xeon" | |
247 | depends on X86_64 | |
248 | help | |
249 | Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey | |
250 | Xeon CPUs with Intel 64bit which is compatible with x86-64. | |
251 | Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the | |
96daa8cd | 252 | Netburst core and shouldn't use this option. You can distinguish them |
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253 | using the cpu family field |
254 | in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. | |
255 | ||
256 | config MCORE2 | |
257 | bool "Core 2/newer Xeon" | |
258 | help | |
259 | Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx) | |
260 | CPUs. You can distinguish newer from older Xeons by the CPU family | |
261 | in /proc/cpuinfo. Newer ones have 6 and older ones 15 (not a typo) | |
262 | ||
263 | config GENERIC_CPU | |
264 | bool "Generic-x86-64" | |
265 | depends on X86_64 | |
266 | help | |
267 | Generic x86-64 CPU. | |
268 | Run equally well on all x86-64 CPUs. | |
269 | ||
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270 | endchoice |
271 | ||
272 | config X86_GENERIC | |
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273 | bool "Generic x86 support" |
274 | depends on X86_32 | |
275 | help | |
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276 | Instead of just including optimizations for the selected |
277 | x86 variant (e.g. PII, Crusoe or Athlon), include some more | |
278 | generic optimizations as well. This will make the kernel | |
279 | perform better on x86 CPUs other than that selected. | |
280 | ||
281 | This is really intended for distributors who need more | |
282 | generic optimizations. | |
283 | ||
284 | endif | |
285 | ||
acbaa93e IM |
286 | config X86_CPU |
287 | def_bool y | |
288 | select GENERIC_FIND_FIRST_BIT | |
289 | select GENERIC_FIND_NEXT_BIT | |
290 | ||
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291 | # |
292 | # Define implied options from the CPU selection here | |
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293 | config X86_L1_CACHE_BYTES |
294 | int | |
295 | default "128" if GENERIC_CPU || MPSC | |
296 | default "64" if MK8 || MCORE2 | |
297 | depends on X86_64 | |
298 | ||
299 | config X86_INTERNODE_CACHE_BYTES | |
300 | int | |
301 | default "4096" if X86_VSMP | |
302 | default X86_L1_CACHE_BYTES if !X86_VSMP | |
303 | depends on X86_64 | |
304 | ||
96d55b88 | 305 | config X86_CMPXCHG |
1032c0ba | 306 | def_bool X86_64 || (X86_32 && !M386) |
96d55b88 | 307 | |
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308 | config X86_L1_CACHE_SHIFT |
309 | int | |
1032c0ba | 310 | default "7" if MPENTIUM4 || X86_GENERIC || GENERIC_CPU || MPSC |
f90b8116 | 311 | default "4" if X86_ELAN || M486 || M386 || MGEODEGX1 |
69d45dd1 | 312 | default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX |
0949be35 | 313 | default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7 |
96d55b88 | 314 | |
c7f81c94 | 315 | config X86_XADD |
96daa8cd | 316 | def_bool y |
1032c0ba | 317 | depends on X86_32 && !M386 |
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318 | |
319 | config X86_PPRO_FENCE | |
fb0328e2 | 320 | bool "PentiumPro memory ordering errata workaround" |
96d55b88 | 321 | depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1 |
fb0328e2 NP |
322 | help |
323 | Old PentiumPro multiprocessor systems had errata that could cause memory | |
324 | operations to violate the x86 ordering standard in rare cases. Enabling this | |
325 | option will attempt to work around some (but not all) occurances of | |
326 | this problem, at the cost of much heavier spinlock and memory barrier | |
327 | operations. | |
328 | ||
329 | If unsure, say n here. Even distro kernels should think twice before enabling | |
330 | this: there are few systems, and an unlikely bug. | |
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331 | |
332 | config X86_F00F_BUG | |
96daa8cd | 333 | def_bool y |
96d55b88 | 334 | depends on M586MMX || M586TSC || M586 || M486 || M386 |
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335 | |
336 | config X86_WP_WORKS_OK | |
96daa8cd | 337 | def_bool y |
293e6a25 | 338 | depends on !M386 |
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339 | |
340 | config X86_INVLPG | |
96daa8cd | 341 | def_bool y |
1032c0ba | 342 | depends on X86_32 && !M386 |
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343 | |
344 | config X86_BSWAP | |
96daa8cd | 345 | def_bool y |
1032c0ba | 346 | depends on X86_32 && !M386 |
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347 | |
348 | config X86_POPAD_OK | |
96daa8cd | 349 | def_bool y |
1032c0ba | 350 | depends on X86_32 && !M386 |
96d55b88 | 351 | |
96d55b88 | 352 | config X86_ALIGNMENT_16 |
96daa8cd | 353 | def_bool y |
69d45dd1 | 354 | depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1 |
96d55b88 | 355 | |
96d55b88 | 356 | config X86_INTEL_USERCOPY |
96daa8cd | 357 | def_bool y |
c55d92d1 | 358 | depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 |
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359 | |
360 | config X86_USE_PPRO_CHECKSUM | |
96daa8cd | 361 | def_bool y |
69d45dd1 | 362 | depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2 |
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363 | |
364 | config X86_USE_3DNOW | |
96daa8cd | 365 | def_bool y |
1b4ad242 | 366 | depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML |
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367 | |
368 | config X86_OOSTORE | |
96daa8cd | 369 | def_bool y |
69d45dd1 | 370 | depends on (MWINCHIP3D || MWINCHIPC6) && MTRR |
96d55b88 | 371 | |
959b3be6 PA |
372 | # |
373 | # P6_NOPs are a relatively minor optimization that require a family >= | |
374 | # 6 processor, except that it is broken on certain VIA chips. | |
375 | # Furthermore, AMD chips prefer a totally different sequence of NOPs | |
14469a8d LT |
376 | # (which work on all CPUs). In addition, it looks like Virtual PC |
377 | # does not understand them. | |
378 | # | |
379 | # As a result, disallow these if we're not compiling for X86_64 (these | |
380 | # NOPs do work on all x86-64 capable chips); the list of processors in | |
381 | # the right-hand clause are the cores that benefit from this optimization. | |
959b3be6 | 382 | # |
7343b3b3 PA |
383 | config X86_P6_NOP |
384 | def_bool y | |
14469a8d LT |
385 | depends on X86_64 |
386 | depends on (MCORE2 || MPENTIUM4 || MPSC) | |
7343b3b3 | 387 | |
96d55b88 | 388 | config X86_TSC |
96daa8cd | 389 | def_bool y |
69d45dd1 | 390 | depends on ((MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ) || X86_64 |
c7f81c94 | 391 | |
f8096f92 JB |
392 | config X86_CMPXCHG64 |
393 | def_bool y | |
394 | depends on X86_PAE || X86_64 | |
395 | ||
c7f81c94 AK |
396 | # this should be set for all -march=.. options where the compiler |
397 | # generates cmov. | |
398 | config X86_CMOV | |
96daa8cd | 399 | def_bool y |
79aa10dd | 400 | depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64) |
c7f81c94 | 401 | |
de32e041 | 402 | config X86_MINIMUM_CPU_FAMILY |
c7f81c94 | 403 | int |
1032c0ba | 404 | default "64" if X86_64 |
7343b3b3 | 405 | default "6" if X86_32 && X86_P6_NOP |
1032c0ba | 406 | default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK) |
de32e041 | 407 | default "3" |
c7f81c94 | 408 | |
0a049bb0 | 409 | config X86_DEBUGCTLMSR |
96daa8cd | 410 | def_bool y |
69d45dd1 | 411 | depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) |
8d02c211 TP |
412 | |
413 | menuconfig PROCESSOR_SELECT | |
8d02c211 TP |
414 | bool "Supported processor vendors" if EMBEDDED |
415 | help | |
416 | This lets you choose what x86 vendor support code your kernel | |
417 | will include. | |
418 | ||
879d792b | 419 | config CPU_SUP_INTEL |
8d02c211 TP |
420 | default y |
421 | bool "Support Intel processors" if PROCESSOR_SELECT | |
8d02c211 | 422 | help |
b7b3a425 IM |
423 | This enables detection, tunings and quirks for Intel processors |
424 | ||
425 | You need this enabled if you want your kernel to run on an | |
426 | Intel CPU. Disabling this option on other types of CPUs | |
427 | makes the kernel a tiny bit smaller. Disabling it on an Intel | |
428 | CPU might render the kernel unbootable. | |
429 | ||
430 | If unsure, say N. | |
8d02c211 TP |
431 | |
432 | config CPU_SUP_CYRIX_32 | |
433 | default y | |
434 | bool "Support Cyrix processors" if PROCESSOR_SELECT | |
435 | depends on !64BIT | |
436 | help | |
b7b3a425 IM |
437 | This enables detection, tunings and quirks for Cyrix processors |
438 | ||
439 | You need this enabled if you want your kernel to run on a | |
440 | Cyrix CPU. Disabling this option on other types of CPUs | |
441 | makes the kernel a tiny bit smaller. Disabling it on a Cyrix | |
442 | CPU might render the kernel unbootable. | |
443 | ||
444 | If unsure, say N. | |
8d02c211 | 445 | |
ff73152c | 446 | config CPU_SUP_AMD |
8d02c211 TP |
447 | default y |
448 | bool "Support AMD processors" if PROCESSOR_SELECT | |
8d02c211 | 449 | help |
b7b3a425 IM |
450 | This enables detection, tunings and quirks for AMD processors |
451 | ||
452 | You need this enabled if you want your kernel to run on an | |
453 | AMD CPU. Disabling this option on other types of CPUs | |
454 | makes the kernel a tiny bit smaller. Disabling it on an AMD | |
455 | CPU might render the kernel unbootable. | |
456 | ||
457 | If unsure, say N. | |
8d02c211 TP |
458 | |
459 | config CPU_SUP_CENTAUR_32 | |
460 | default y | |
461 | bool "Support Centaur processors" if PROCESSOR_SELECT | |
462 | depends on !64BIT | |
463 | help | |
b7b3a425 IM |
464 | This enables detection, tunings and quirks for Centaur processors |
465 | ||
466 | You need this enabled if you want your kernel to run on a | |
467 | Centaur CPU. Disabling this option on other types of CPUs | |
468 | makes the kernel a tiny bit smaller. Disabling it on a Centaur | |
469 | CPU might render the kernel unbootable. | |
470 | ||
471 | If unsure, say N. | |
8d02c211 TP |
472 | |
473 | config CPU_SUP_CENTAUR_64 | |
474 | default y | |
475 | bool "Support Centaur processors" if PROCESSOR_SELECT | |
476 | depends on 64BIT | |
477 | help | |
b7b3a425 IM |
478 | This enables detection, tunings and quirks for Centaur processors |
479 | ||
480 | You need this enabled if you want your kernel to run on a | |
481 | Centaur CPU. Disabling this option on other types of CPUs | |
482 | makes the kernel a tiny bit smaller. Disabling it on a Centaur | |
483 | CPU might render the kernel unbootable. | |
484 | ||
485 | If unsure, say N. | |
8d02c211 TP |
486 | |
487 | config CPU_SUP_TRANSMETA_32 | |
488 | default y | |
489 | bool "Support Transmeta processors" if PROCESSOR_SELECT | |
490 | depends on !64BIT | |
491 | help | |
b7b3a425 IM |
492 | This enables detection, tunings and quirks for Transmeta processors |
493 | ||
494 | You need this enabled if you want your kernel to run on a | |
495 | Transmeta CPU. Disabling this option on other types of CPUs | |
496 | makes the kernel a tiny bit smaller. Disabling it on a Transmeta | |
497 | CPU might render the kernel unbootable. | |
498 | ||
499 | If unsure, say N. | |
8d02c211 TP |
500 | |
501 | config CPU_SUP_UMC_32 | |
502 | default y | |
503 | bool "Support UMC processors" if PROCESSOR_SELECT | |
504 | depends on !64BIT | |
505 | help | |
b7b3a425 IM |
506 | This enables detection, tunings and quirks for UMC processors |
507 | ||
508 | You need this enabled if you want your kernel to run on a | |
509 | UMC CPU. Disabling this option on other types of CPUs | |
510 | makes the kernel a tiny bit smaller. Disabling it on a UMC | |
511 | CPU might render the kernel unbootable. | |
512 | ||
513 | If unsure, say N. | |
81faaae4 | 514 | |
93fa7636 | 515 | config X86_DS |
531f6ed7 MM |
516 | def_bool X86_PTRACE_BTS |
517 | depends on X86_DEBUGCTLMSR | |
93fa7636 MM |
518 | |
519 | config X86_PTRACE_BTS | |
531f6ed7 | 520 | bool "Branch Trace Store" |
93fa7636 | 521 | default y |
531f6ed7 | 522 | depends on X86_DEBUGCTLMSR |
93fa7636 | 523 | help |
531f6ed7 MM |
524 | This adds a ptrace interface to the hardware's branch trace store. |
525 | ||
526 | Debuggers may use it to collect an execution trace of the debugged | |
527 | application in order to answer the question 'how did I get here?'. | |
528 | Debuggers may trace user mode as well as kernel mode. | |
529 | ||
530 | Say Y unless there is no application development on this machine | |
531 | and you want to save a small amount of code size. |