1 # SPDX-License-Identifier: GPL-2.0
7 This option selects whether a 32-bit or a 64-bit kernel
10 menu "Processor support"
12 prompt "Processor Type"
15 There are five families of 32 bit PowerPC chips supported.
16 The most common ones are the desktop and server CPUs (601, 603,
17 604, 740, 750, 74xx) CPUs from Freescale and IBM, with their
18 embedded 512x/52xx/82xx/83xx/86xx counterparts.
19 The other embedded parts, namely 4xx, 8xx, e200 (55xx) and e500
20 (85xx) each form a family of their own that is not compatible
23 If unsure, select 52xx/6xx/7xx/74xx/82xx/83xx/86xx.
26 bool "512x/52xx/6xx/7xx/74xx/82xx/83xx/86xx"
36 select SYS_SUPPORTS_HUGETLBFS
46 bool "AMCC 44x, 46x or 47x"
59 prompt "Processor Type"
62 There are two families of 64 bit PowerPC chips supported.
63 The most common ones are the desktop and server CPUs
64 (POWER4, POWER5, 970, POWER5+, POWER6, POWER7, POWER8 ...)
66 The other are the "embedded" processors compliant with the
67 "Book 3E" variant of the architecture
70 bool "Server processors"
72 select PPC_HAVE_PMU_SUPPORT
73 select SYS_SUPPORTS_HUGETLBFS
74 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
75 select ARCH_SUPPORTS_NUMA_BALANCING
80 bool "Embedded processors"
81 select PPC_FPU # Make it a choice ?
82 select PPC_SMP_MUXED_IPI
88 prompt "CPU selection"
90 default POWER8_CPU if CPU_LITTLE_ENDIAN
93 This will create a kernel which is optimised for a particular CPU.
94 The resulting kernel may not run on other CPUs, so use this with care.
96 If unsure, select Generic.
100 depends on !CPU_LITTLE_ENDIAN
103 bool "Cell Broadband Engine"
104 depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
108 depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
112 depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
116 depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
120 depends on PPC_BOOK3S_64
121 select ARCH_HAS_FAST_MULTIPLIER
125 depends on PPC_BOOK3S_64
126 select ARCH_HAS_FAST_MULTIPLIER
129 bool "Freescale e5500"
133 bool "Freescale e6500"
140 depends on PPC_BOOK3S_32 || PPC_BOOK3S_64
144 depends on PPC_BOOK3E_64
148 depends on PPC32 && PPC_BOOK3S
149 select PPC_HAVE_PMU_SUPPORT
152 select FSL_EMB_PERFMON
153 select PPC_FSL_BOOK3E
157 bool "e500mc Support"
162 This must be enabled for running on e500mc (and derivatives
163 such as e5500/e6500), and must be disabled for running on
170 config FSL_EMB_PERFMON
171 bool "Freescale Embedded Perfmon"
172 depends on E500 || PPC_83xx
174 This is the Performance Monitor support found on the e500 core
175 and some e300 cores (c3 and c4). Select this only if your
176 core supports the Embedded Performance Monitor APU
178 config FSL_EMB_PERF_EVENT
180 depends on FSL_EMB_PERFMON && PERF_EVENTS && !PPC_PERF_CTRS
183 config FSL_EMB_PERF_EVENT_E500
185 depends on FSL_EMB_PERF_EVENT && E500
190 depends on 40x || 44x
195 depends on E200 || E500 || 44x || PPC_BOOK3E
200 depends on (E200 || E500) && PPC32
203 # this is for common code between PPC32 & PPC64 FSL BOOKE
204 config PPC_FSL_BOOK3E
206 select FSL_EMB_PERFMON
207 select PPC_SMP_MUXED_IPI
208 select SYS_SUPPORTS_HUGETLBFS if PHYS_64BIT || PPC64
210 default y if FSL_BOOKE
214 depends on 44x || E500 || PPC_86xx
215 default y if PHYS_64BIT
218 bool 'Large physical address support' if E500 || PPC_86xx
219 depends on (44x || E500 || PPC_86xx) && !PPC_83xx && !PPC_82xx
221 This option enables kernel support for larger than 32-bit physical
222 addresses. This feature may not be available on all cores.
224 If you have more than 3.5GB of RAM or so, you also need to enable
225 SWIOTLB under Kernel Options for this to work. The actual number
226 is platform-dependent.
228 If in doubt, say N here.
231 bool "AltiVec Support"
232 depends on 6xx || PPC_BOOK3S_64 || (PPC_E500MC && PPC64)
234 This option enables kernel support for the Altivec extensions to the
235 PowerPC processor. The kernel currently supports saving and restoring
236 altivec registers, and turning on the 'altivec enable' bit so user
237 processes can execute altivec instructions.
239 This option is only usefully if you have a processor that supports
240 altivec (G4, otherwise known as 74xx series), but does not have
241 any affect on a non-altivec cpu (it does, however add code to the
244 If in doubt, say Y here.
248 depends on PPC_BOOK3S_64 && ALTIVEC && PPC_FPU
251 This option enables kernel support for the Vector Scaler extensions
252 to the PowerPC processor. The kernel currently supports saving and
253 restoring VSX registers, and turning on the 'VSX enable' bit so user
254 processes can execute VSX instructions.
256 This option is only useful if you have a processor that supports
257 VSX (P7 and above), but does not have any affect on a non-VSX
258 CPUs (it does, however add code to the kernel).
260 If in doubt, say Y here.
264 depends on E200 || (E500 && !PPC_E500MC)
268 depends on SPE_POSSIBLE
271 This option enables kernel support for the Signal Processing
272 Extensions (SPE) to the PowerPC processor. The kernel currently
273 supports saving and restoring SPE registers, and turning on the
274 'spe enable' bit so user processes can execute SPE instructions.
276 This option is only useful if you have a processor that supports
277 SPE (e500, otherwise known as 85xx series), but does not have any
278 effect on a non-spe cpu (it does, however add code to the kernel).
280 If in doubt, say Y here.
284 depends on PPC_BOOK3S
286 config PPC_STD_MMU_32
288 depends on PPC_STD_MMU && PPC32
291 bool "Radix MMU Support"
292 depends on PPC_BOOK3S_64
293 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
296 Enable support for the Power ISA 3.0 Radix style MMU. Currently this
297 is only implemented by IBM Power9 CPUs, if you don't have one of them
298 you can probably disable this.
300 config PPC_RADIX_MMU_DEFAULT
301 bool "Default to using the Radix MMU when possible"
302 depends on PPC_RADIX_MMU
305 When the hardware supports the Radix MMU, default to using it unless
306 "disable_radix[=yes]" is specified on the kernel command line.
308 If this option is disabled, the Hash MMU will be used by default,
309 unless "disable_radix=no" is specified on the kernel command line.
311 If you're unsure, say Y.
313 config ARCH_ENABLE_HUGEPAGE_MIGRATION
315 depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION
318 config PPC_MMU_NOHASH
320 depends on !PPC_STD_MMU
322 config PPC_BOOK3E_MMU
324 depends on FSL_BOOKE || PPC_BOOK3E
328 default y if PPC_BOOK3S_64
331 config PPC_HAVE_PMU_SUPPORT
336 depends on PERF_EVENTS && PPC_HAVE_PMU_SUPPORT
338 This enables the powerpc-specific perf_event back-end.
341 # Allow platforms to force SMP=y by selecting this
347 depends on PPC_BOOK3S || PPC_BOOK3E || FSL_BOOKE || PPC_47x
348 select GENERIC_IRQ_MIGRATION
349 bool "Symmetric multi-processing support" if !FORCE_SMP
351 This enables support for systems with more than one CPU. If you have
352 a system with only one CPU, say N. If you have a system with more
353 than one CPU, say Y. Note that the kernel does not currently
354 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
355 since they have inadequate hardware support for multiprocessor
358 If you say N here, the kernel will run on single and multiprocessor
359 machines, but will use only one CPU of a multiprocessor machine. If
360 you say Y here, the kernel will run on single-processor machines.
361 On a single-processor machine, the kernel will run faster if you say
364 If you don't know what to do here, say N.
367 int "Maximum number of CPUs (2-8192)"
370 default "32" if PPC64
373 config NOT_COHERENT_CACHE
375 depends on 4xx || PPC_8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON
379 config CHECK_CACHE_COHERENCY
390 depends on PPC32 || CPU_BIG_ENDIAN
392 This symbol controls whether we build the 32-bit VDSO. We obviously
393 want to do that if we're building a 32-bit kernel. If we're building
394 a 64-bit kernel then we only want a 32-bit VDSO if we're building for
395 big endian. That is because the only little endian configuration we
396 support is ppc64le which is 64-bit only.
399 prompt "Endianness selection"
400 default CPU_BIG_ENDIAN
402 This option selects whether a big endian or little endian kernel will
405 config CPU_BIG_ENDIAN
406 bool "Build big endian kernel"
408 Build a big endian kernel.
410 If unsure, select this option.
412 config CPU_LITTLE_ENDIAN
413 bool "Build little endian kernel"
414 depends on PPC_BOOK3S_64
415 select PPC64_BOOT_WRAPPER
417 Build a little endian kernel.
419 Note that if cross compiling a little endian kernel,
420 CROSS_COMPILE must point to a toolchain capable of targeting
421 little endian powerpc.
425 config PPC64_BOOT_WRAPPER
427 depends on CPU_LITTLE_ENDIAN