1 # Put here option for CPU selection and depending optimization
5 prompt "Processor family"
11 This is the processor type of your CPU. This information is used for
12 optimizing purposes. In order to compile a kernel that can run on
13 all x86 CPU types (albeit not optimally fast), you can specify
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.
20 Here are the settings recommended for greatest speed:
21 - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
22 486DLC/DLC2, UMC 486SX-S and NexGen Nx586. Only "386" kernels
23 will run on a 386 class machine.
24 - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
25 SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
26 - "586" for generic Pentium CPUs lacking the TSC
27 (time stamp counter) register.
28 - "Pentium-Classic" for the Intel Pentium.
29 - "Pentium-MMX" for the Intel Pentium MMX.
30 - "Pentium-Pro" for the Intel Pentium Pro.
31 - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
32 - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
33 - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
34 - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
35 - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
36 - "Crusoe" for the Transmeta Crusoe series.
37 - "Efficeon" for the Transmeta Efficeon series.
38 - "Winchip-C6" for original IDT Winchip.
39 - "Winchip-2" for IDT Winchip 2.
40 - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
41 - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
42 - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
43 - "VIA C3-2 for VIA C3-2 "Nehemiah" (model 9 and above).
45 If you don't know what to do, choose "386".
50 Select this for a 486 series processor, either Intel or one of the
51 compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX,
52 DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
56 bool "586/K5/5x86/6x86/6x86MX"
58 Select this for an 586 or 686 series processor such as the AMD K5,
59 the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
60 assume the RDTSC (Read Time Stamp Counter) instruction.
63 bool "Pentium-Classic"
65 Select this for a Pentium Classic processor with the RDTSC (Read
66 Time Stamp Counter) instruction for benchmarking.
71 Select this for a Pentium with the MMX graphics/multimedia
72 extended instructions.
77 Select this for Intel Pentium Pro chips. This enables the use of
78 Pentium Pro extended instructions, and disables the init-time guard
79 against the f00f bug found in earlier Pentiums.
82 bool "Pentium-II/Celeron(pre-Coppermine)"
84 Select this for Intel chips based on the Pentium-II and
85 pre-Coppermine Celeron core. This option enables an unaligned
86 copy optimization, compiles the kernel with optimization flags
87 tailored for the chip, and applies any applicable Pentium Pro
91 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
93 Select this for Intel chips based on the Pentium-III and
94 Celeron-Coppermine core. This option enables use of some
95 extended prefetch instructions in addition to the Pentium II
101 Select this for Intel Pentium M (not Pentium-4 M)
105 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon"
107 Select this for Intel Pentium 4 chips. This includes the
108 Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
109 (not Pentium M) chips. This option enables compile flags
110 optimized for the chip, uses the correct cache shift, and
111 applies any applicable Pentium III optimizations.
114 bool "K6/K6-II/K6-III"
116 Select this for an AMD K6-family processor. Enables use of
117 some extended instructions, and passes appropriate optimization
121 bool "Athlon/Duron/K7"
123 Select this for an AMD Athlon K7-family processor. Enables use of
124 some extended instructions, and passes appropriate optimization
128 bool "Opteron/Athlon64/Hammer/K8"
130 Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables
131 use of some extended instructions, and passes appropriate optimization
137 Select this for a Transmeta Crusoe processor. Treats the processor
138 like a 586 with TSC, and sets some GCC optimization flags (like a
139 Pentium Pro with no alignment requirements).
144 Select this for a Transmeta Efficeon processor.
149 Select this for an IDT Winchip C6 chip. Linux and GCC
150 treat this chip as a 586TSC with some extended instructions
151 and alignment requirements.
156 Select this for an IDT Winchip-2. Linux and GCC
157 treat this chip as a 586TSC with some extended instructions
158 and alignment requirements.
161 bool "Winchip-2A/Winchip-3"
163 Select this for an IDT Winchip-2A or 3. Linux and GCC
164 treat this chip as a 586TSC with some extended instructions
165 and alignment reqirements. Also enable out of order memory
166 stores for this CPU, which can increase performance of some
172 Select this for a Geode GX1 (Cyrix MediaGX) chip.
175 bool "CyrixIII/VIA-C3"
177 Select this for a Cyrix III or C3 chip. Presently Linux and GCC
178 treat this chip as a generic 586. Whilst the CPU is 686 class,
179 it lacks the cmov extension which gcc assumes is present when
181 Note that Nehemiah (Model 9) and above will not boot with this
182 kernel due to them lacking the 3DNow! instructions used in earlier
183 incarnations of the CPU.
186 bool "VIA C3-2 (Nehemiah)"
188 Select this for a VIA C3 "Nehemiah". Selecting this enables usage
189 of SSE and tells gcc to treat the CPU as a 686.
190 Note, this kernel will not boot on older (pre model 9) C3s.
195 bool "Generic x86 support"
197 Instead of just including optimizations for the selected
198 x86 variant (e.g. PII, Crusoe or Athlon), include some more
199 generic optimizations as well. This will make the kernel
200 perform better on x86 CPUs other than that selected.
202 This is really intended for distributors who need more
203 generic optimizations.
208 # Define implied options from the CPU selection here
220 config X86_L1_CACHE_SHIFT
222 default "7" if MPENTIUM4 || X86_GENERIC
223 default "4" if X86_ELAN || M486 || M386
224 default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1
225 default "6" if MK7 || MK8 || MPENTIUMM
227 config RWSEM_GENERIC_SPINLOCK
232 config RWSEM_XCHGADD_ALGORITHM
237 config GENERIC_CALIBRATE_DELAY
241 config X86_PPRO_FENCE
243 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
248 depends on M586MMX || M586TSC || M586 || M486 || M386
251 config X86_WP_WORKS_OK
273 depends on !M386 && !M486
276 config X86_ALIGNMENT_16
278 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
283 depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON
286 config X86_INTEL_USERCOPY
288 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON
291 config X86_USE_PPRO_CHECKSUM
293 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON
298 depends on MCYRIXIII || MK7
303 depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
308 depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1) && !X86_NUMAQ