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 (POWER5, 970, POWER5+, POWER6, POWER7, POWER8, POWER9 ...)
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"
92 This will create a kernel which is optimised for a particular CPU.
93 The resulting kernel may not run on other CPUs, so use this with care.
95 If unsure, select Generic.
98 bool "Generic (POWER4 and above)"
99 depends on !CPU_LITTLE_ENDIAN
102 bool "Generic (POWER8 and above)"
103 depends on CPU_LITTLE_ENDIAN
104 select ARCH_HAS_FAST_MULTIPLIER
107 bool "Cell Broadband Engine"
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
130 depends on PPC_BOOK3S_64
131 select ARCH_HAS_FAST_MULTIPLIER
134 bool "Freescale e5500"
138 bool "Freescale e6500"
145 depends on PPC_BOOK3S_32 || PPC_BOOK3S_64
149 depends on PPC_BOOK3E_64
153 depends on PPC32 && PPC_BOOK3S
154 select PPC_HAVE_PMU_SUPPORT
157 select FSL_EMB_PERFMON
158 select PPC_FSL_BOOK3E
162 bool "e500mc Support"
167 This must be enabled for running on e500mc (and derivatives
168 such as e5500/e6500), and must be disabled for running on
175 config FSL_EMB_PERFMON
176 bool "Freescale Embedded Perfmon"
177 depends on E500 || PPC_83xx
179 This is the Performance Monitor support found on the e500 core
180 and some e300 cores (c3 and c4). Select this only if your
181 core supports the Embedded Performance Monitor APU
183 config FSL_EMB_PERF_EVENT
185 depends on FSL_EMB_PERFMON && PERF_EVENTS && !PPC_PERF_CTRS
188 config FSL_EMB_PERF_EVENT_E500
190 depends on FSL_EMB_PERF_EVENT && E500
195 depends on 40x || 44x
200 depends on E200 || E500 || 44x || PPC_BOOK3E
205 depends on (E200 || E500) && PPC32
208 # this is for common code between PPC32 & PPC64 FSL BOOKE
209 config PPC_FSL_BOOK3E
211 select FSL_EMB_PERFMON
212 select PPC_SMP_MUXED_IPI
213 select SYS_SUPPORTS_HUGETLBFS if PHYS_64BIT || PPC64
215 default y if FSL_BOOKE
219 depends on 44x || E500 || PPC_86xx
220 default y if PHYS_64BIT
223 bool 'Large physical address support' if E500 || PPC_86xx
224 depends on (44x || E500 || PPC_86xx) && !PPC_83xx && !PPC_82xx
226 This option enables kernel support for larger than 32-bit physical
227 addresses. This feature may not be available on all cores.
229 If you have more than 3.5GB of RAM or so, you also need to enable
230 SWIOTLB under Kernel Options for this to work. The actual number
231 is platform-dependent.
233 If in doubt, say N here.
236 bool "AltiVec Support"
237 depends on 6xx || PPC_BOOK3S_64 || (PPC_E500MC && PPC64)
239 This option enables kernel support for the Altivec extensions to the
240 PowerPC processor. The kernel currently supports saving and restoring
241 altivec registers, and turning on the 'altivec enable' bit so user
242 processes can execute altivec instructions.
244 This option is only usefully if you have a processor that supports
245 altivec (G4, otherwise known as 74xx series), but does not have
246 any affect on a non-altivec cpu (it does, however add code to the
249 If in doubt, say Y here.
253 depends on PPC_BOOK3S_64 && ALTIVEC && PPC_FPU
256 This option enables kernel support for the Vector Scaler extensions
257 to the PowerPC processor. The kernel currently supports saving and
258 restoring VSX registers, and turning on the 'VSX enable' bit so user
259 processes can execute VSX instructions.
261 This option is only useful if you have a processor that supports
262 VSX (P7 and above), but does not have any affect on a non-VSX
263 CPUs (it does, however add code to the kernel).
265 If in doubt, say Y here.
269 depends on E200 || (E500 && !PPC_E500MC)
273 depends on SPE_POSSIBLE
276 This option enables kernel support for the Signal Processing
277 Extensions (SPE) to the PowerPC processor. The kernel currently
278 supports saving and restoring SPE registers, and turning on the
279 'spe enable' bit so user processes can execute SPE instructions.
281 This option is only useful if you have a processor that supports
282 SPE (e500, otherwise known as 85xx series), but does not have any
283 effect on a non-spe cpu (it does, however add code to the kernel).
285 If in doubt, say Y here.
289 depends on PPC_BOOK3S
291 config PPC_STD_MMU_32
293 depends on PPC_STD_MMU && PPC32
296 bool "Radix MMU Support"
297 depends on PPC_BOOK3S_64
298 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
301 Enable support for the Power ISA 3.0 Radix style MMU. Currently this
302 is only implemented by IBM Power9 CPUs, if you don't have one of them
303 you can probably disable this.
305 config PPC_RADIX_MMU_DEFAULT
306 bool "Default to using the Radix MMU when possible"
307 depends on PPC_RADIX_MMU
310 When the hardware supports the Radix MMU, default to using it unless
311 "disable_radix[=yes]" is specified on the kernel command line.
313 If this option is disabled, the Hash MMU will be used by default,
314 unless "disable_radix=no" is specified on the kernel command line.
316 If you're unsure, say Y.
318 config ARCH_ENABLE_HUGEPAGE_MIGRATION
320 depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION
323 config PPC_MMU_NOHASH
325 depends on !PPC_STD_MMU
327 config PPC_BOOK3E_MMU
329 depends on FSL_BOOKE || PPC_BOOK3E
333 default y if PPC_BOOK3S_64
334 default y if PPC_8xx && HUGETLB_PAGE
337 config PPC_HAVE_PMU_SUPPORT
342 depends on PERF_EVENTS && PPC_HAVE_PMU_SUPPORT
344 This enables the powerpc-specific perf_event back-end.
347 # Allow platforms to force SMP=y by selecting this
353 depends on PPC_BOOK3S || PPC_BOOK3E || FSL_BOOKE || PPC_47x
354 select GENERIC_IRQ_MIGRATION
355 bool "Symmetric multi-processing support" if !FORCE_SMP
357 This enables support for systems with more than one CPU. If you have
358 a system with only one CPU, say N. If you have a system with more
359 than one CPU, say Y. Note that the kernel does not currently
360 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
361 since they have inadequate hardware support for multiprocessor
364 If you say N here, the kernel will run on single and multiprocessor
365 machines, but will use only one CPU of a multiprocessor machine. If
366 you say Y here, the kernel will run on single-processor machines.
367 On a single-processor machine, the kernel will run faster if you say
370 If you don't know what to do here, say N.
373 int "Maximum number of CPUs (2-8192)"
376 default "32" if PPC64
379 config NOT_COHERENT_CACHE
381 depends on 4xx || PPC_8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON
385 config CHECK_CACHE_COHERENCY
396 depends on PPC32 || CPU_BIG_ENDIAN
398 This symbol controls whether we build the 32-bit VDSO. We obviously
399 want to do that if we're building a 32-bit kernel. If we're building
400 a 64-bit kernel then we only want a 32-bit VDSO if we're building for
401 big endian. That is because the only little endian configuration we
402 support is ppc64le which is 64-bit only.
405 prompt "Endianness selection"
406 default CPU_BIG_ENDIAN
408 This option selects whether a big endian or little endian kernel will
411 config CPU_BIG_ENDIAN
412 bool "Build big endian kernel"
414 Build a big endian kernel.
416 If unsure, select this option.
418 config CPU_LITTLE_ENDIAN
419 bool "Build little endian kernel"
420 depends on PPC_BOOK3S_64
421 select PPC64_BOOT_WRAPPER
423 Build a little endian kernel.
425 Note that if cross compiling a little endian kernel,
426 CROSS_COMPILE must point to a toolchain capable of targeting
427 little endian powerpc.
431 config PPC64_BOOT_WRAPPER
433 depends on CPU_LITTLE_ENDIAN