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1# SPDX-License-Identifier: GPL-2.0
2source "arch/powerpc/platforms/Kconfig.cputype"
3
4config CC_HAS_ELFV2
5 def_bool PPC64 && $(cc-option, -mabi=elfv2)
6
7config CC_HAS_PREFIXED
8 def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)
9
10config CC_HAS_PCREL
11 # Clang has a bug (https://github.com/llvm/llvm-project/issues/62372)
12 # where pcrel code is not generated if -msoft-float, -mno-altivec, or
13 # -mno-vsx options are also given. Without these options, fp/vec
14 # instructions are generated from regular kernel code. So Clang can't
15 # do pcrel yet.
16 def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel)
17
18config 32BIT
19 bool
20 default y if PPC32
21
22config 64BIT
23 bool
24 default y if PPC64
25
26config LIVEPATCH_64
27 def_bool PPC64
28 depends on LIVEPATCH
29
30config MMU
31 bool
32 default y
33
34config ARCH_MMAP_RND_BITS_MAX
35 # On Book3S 64, the default virtual address space for 64-bit processes
36 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
37 # 32T of address space (2^45), which should ensure a reasonable gap
38 # between bottom-up and top-down allocations for applications that
39 # consume "normal" amounts of address space. Book3S 64 only supports 64K
40 # and 4K page sizes.
41 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
42 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
43 #
44 # On all other 64-bit platforms (currently only Book3E), the virtual
45 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
46 # of address space (2^44). Only 4K page sizes are supported.
47 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
48 #
49 # For 32-bit, use the compat values, as they're the same.
50 default ARCH_MMAP_RND_COMPAT_BITS_MAX
51
52config ARCH_MMAP_RND_BITS_MIN
53 # Allow randomisation to consume up to 1GB of address space (2^30).
54 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
55 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
56 #
57 # For 32-bit, use the compat values, as they're the same.
58 default ARCH_MMAP_RND_COMPAT_BITS_MIN
59
60config ARCH_MMAP_RND_COMPAT_BITS_MAX
61 # Total virtual address space for 32-bit processes is 2^31 (2GB).
62 # Allow randomisation to consume up to 512MB of address space (2^29).
63 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
64 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
65 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
66 default 17 # 17 = 29 (512MB) - 12 (4K)
67
68config ARCH_MMAP_RND_COMPAT_BITS_MIN
69 # Total virtual address space for 32-bit processes is 2^31 (2GB).
70 # Allow randomisation to consume up to 8MB of address space (2^23).
71 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
72 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
73 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
74 default 11 # 11 = 23 (8MB) - 12 (4K)
75
76config NR_IRQS
77 int "Number of virtual interrupt numbers"
78 range 32 1048576
79 default "512"
80 help
81 This defines the number of virtual interrupt numbers the kernel
82 can manage. Virtual interrupt numbers are what you see in
83 /proc/interrupts. If you configure your system to have too few,
84 drivers will fail to load or worse - handle with care.
85
86config NMI_IPI
87 bool
88 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
89 default y
90
91config PPC_WATCHDOG
92 bool
93 depends on HARDLOCKUP_DETECTOR_ARCH
94 default y
95 help
96 This is a placeholder when the powerpc hardlockup detector
97 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
98 selected via the generic lockup detector menu which is why we
99 have no standalone config option for it here.
100
101config STACKTRACE_SUPPORT
102 bool
103 default y
104
105config LOCKDEP_SUPPORT
106 bool
107 default y
108
109config GENERIC_LOCKBREAK
110 bool
111 default y
112 depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS
113
114config GENERIC_HWEIGHT
115 bool
116 default y
117
118config PPC
119 bool
120 default y
121 #
122 # Please keep this list sorted alphabetically.
123 #
124 select ARCH_32BIT_OFF_T if PPC32
125 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
126 select ARCH_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
127 select ARCH_ENABLE_MEMORY_HOTPLUG
128 select ARCH_ENABLE_MEMORY_HOTREMOVE
129 select ARCH_HAS_COPY_MC if PPC64
130 select ARCH_HAS_CURRENT_STACK_POINTER
131 select ARCH_HAS_DEBUG_VIRTUAL
132 select ARCH_HAS_DEBUG_VM_PGTABLE
133 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
134 select ARCH_HAS_DEVMEM_IS_ALLOWED
135 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
136 select ARCH_HAS_FORTIFY_SOURCE
137 select ARCH_HAS_GCOV_PROFILE_ALL
138 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
139 select ARCH_HAS_KCOV
140 select ARCH_HAS_MEMBARRIER_CALLBACKS
141 select ARCH_HAS_MEMBARRIER_SYNC_CORE
142 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
143 select ARCH_HAS_MMIOWB if PPC64
144 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
145 select ARCH_HAS_PHYS_TO_DMA
146 select ARCH_HAS_PMEM_API
147 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
148 select ARCH_HAS_PTE_SPECIAL
149 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
150 select ARCH_HAS_SET_MEMORY
151 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
152 select ARCH_HAS_STRICT_KERNEL_RWX if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE
153 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
154 select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT
155 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
156 select ARCH_HAS_UACCESS_FLUSHCACHE
157 select ARCH_HAS_UBSAN_SANITIZE_ALL
158 select ARCH_HAVE_NMI_SAFE_CMPXCHG
159 select ARCH_KEEP_MEMBLOCK
160 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if PPC_RADIX_MMU
161 select ARCH_MIGHT_HAVE_PC_PARPORT
162 select ARCH_MIGHT_HAVE_PC_SERIO
163 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
164 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
165 select ARCH_SPLIT_ARG64 if PPC32
166 select ARCH_STACKWALK
167 select ARCH_SUPPORTS_ATOMIC_RMW
168 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
169 select ARCH_USE_BUILTIN_BSWAP
170 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
171 select ARCH_USE_MEMTEST
172 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
173 select ARCH_WANT_DEFAULT_BPF_JIT
174 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
175 select ARCH_WANT_IPC_PARSE_VERSION
176 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
177 select ARCH_WANT_LD_ORPHAN_WARN
178 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP if PPC_RADIX_MMU
179 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
180 select ARCH_WEAK_RELEASE_ACQUIRE
181 select BINFMT_ELF
182 select BUILDTIME_TABLE_SORT
183 select CLONE_BACKWARDS
184 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
185 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
186 select DMA_OPS_BYPASS if PPC64
187 select DMA_OPS if PPC64
188 select DYNAMIC_FTRACE if FUNCTION_TRACER
189 select EDAC_ATOMIC_SCRUB
190 select EDAC_SUPPORT
191 select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if ARCH_USING_PATCHABLE_FUNCTION_ENTRY
192 select FUNCTION_ALIGNMENT_4B
193 select GENERIC_ATOMIC64 if PPC32
194 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
195 select GENERIC_CMOS_UPDATE
196 select GENERIC_CPU_AUTOPROBE
197 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
198 select GENERIC_EARLY_IOREMAP
199 select GENERIC_GETTIMEOFDAY
200 select GENERIC_IDLE_POLL_SETUP
201 select GENERIC_IOREMAP
202 select GENERIC_IRQ_SHOW
203 select GENERIC_IRQ_SHOW_LEVEL
204 select GENERIC_PCI_IOMAP if PCI
205 select GENERIC_PTDUMP
206 select GENERIC_SMP_IDLE_THREAD
207 select GENERIC_TIME_VSYSCALL
208 select GENERIC_VDSO_TIME_NS
209 select HAS_IOPORT if PCI
210 select HAVE_ARCH_AUDITSYSCALL
211 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
212 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
213 select HAVE_ARCH_JUMP_LABEL
214 select HAVE_ARCH_JUMP_LABEL_RELATIVE
215 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
216 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
217 select HAVE_ARCH_KASAN if PPC_BOOK3E_64
218 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
219 select HAVE_ARCH_KCSAN
220 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
221 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
222 select HAVE_ARCH_WITHIN_STACK_FRAMES
223 select HAVE_ARCH_KGDB
224 select HAVE_ARCH_MMAP_RND_BITS
225 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
226 select HAVE_ARCH_NVRAM_OPS
227 select HAVE_ARCH_SECCOMP_FILTER
228 select HAVE_ARCH_TRACEHOOK
229 select HAVE_ASM_MODVERSIONS
230 select HAVE_CONTEXT_TRACKING_USER
231 select HAVE_C_RECORDMCOUNT
232 select HAVE_DEBUG_KMEMLEAK
233 select HAVE_DEBUG_STACKOVERFLOW
234 select HAVE_DYNAMIC_FTRACE
235 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
236 select HAVE_DYNAMIC_FTRACE_WITH_REGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
237 select HAVE_EBPF_JIT
238 select HAVE_EFFICIENT_UNALIGNED_ACCESS
239 select HAVE_FAST_GUP
240 select HAVE_FTRACE_MCOUNT_RECORD
241 select HAVE_FUNCTION_ARG_ACCESS_API
242 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
243 select HAVE_FUNCTION_ERROR_INJECTION
244 select HAVE_FUNCTION_GRAPH_TRACER
245 select HAVE_FUNCTION_TRACER if PPC64 || (PPC32 && CC_IS_GCC)
246 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
247 select HAVE_GENERIC_VDSO
248 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
249 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
250 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
251 select HAVE_IOREMAP_PROT
252 select HAVE_IRQ_TIME_ACCOUNTING
253 select HAVE_KERNEL_GZIP
254 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
255 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
256 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
257 select HAVE_KPROBES
258 select HAVE_KPROBES_ON_FTRACE
259 select HAVE_KRETPROBES
260 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT && (!ARCH_USING_PATCHABLE_FUNCTION_ENTRY || (!CC_IS_GCC || GCC_VERSION >= 110100))
261 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
262 select HAVE_MOD_ARCH_SPECIFIC
263 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
264 select HAVE_OPTPROBES
265 select HAVE_OBJTOOL if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
266 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
267 select HAVE_PERF_EVENTS
268 select HAVE_PERF_EVENTS_NMI if PPC64
269 select HAVE_PERF_REGS
270 select HAVE_PERF_USER_STACK_DUMP
271 select HAVE_REGS_AND_STACK_ACCESS_API
272 select HAVE_RELIABLE_STACKTRACE
273 select HAVE_RSEQ
274 select HAVE_SETUP_PER_CPU_AREA if PPC64
275 select HAVE_SOFTIRQ_ON_OWN_STACK
276 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
277 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
278 select HAVE_STATIC_CALL if PPC32
279 select HAVE_SYSCALL_TRACEPOINTS
280 select HAVE_VIRT_CPU_ACCOUNTING
281 select HAVE_VIRT_CPU_ACCOUNTING_GEN
282 select HOTPLUG_SMT if HOTPLUG_CPU
283 select SMT_NUM_THREADS_DYNAMIC
284 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
285 select IOMMU_HELPER if PPC64
286 select IRQ_DOMAIN
287 select IRQ_FORCED_THREADING
288 select KASAN_VMALLOC if KASAN && MODULES
289 select LOCK_MM_AND_FIND_VMA
290 select MMU_GATHER_PAGE_SIZE
291 select MMU_GATHER_RCU_TABLE_FREE
292 select MMU_GATHER_MERGE_VMAS
293 select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64
294 select MODULES_USE_ELF_RELA
295 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
296 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
297 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
298 select NEED_SG_DMA_LENGTH
299 select OF
300 select OF_EARLY_FLATTREE
301 select OLD_SIGACTION if PPC32
302 select OLD_SIGSUSPEND
303 select PCI_DOMAINS if PCI
304 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
305 select PCI_SYSCALL if PCI
306 select PPC_DAWR if PPC64
307 select RTC_LIB
308 select SPARSE_IRQ
309 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
310 select SYSCTL_EXCEPTION_TRACE
311 select THREAD_INFO_IN_TASK
312 select TRACE_IRQFLAGS_SUPPORT
313 #
314 # Please keep this list sorted alphabetically.
315 #
316
317config PPC_BARRIER_NOSPEC
318 bool
319 default y
320 depends on PPC_BOOK3S_64 || PPC_E500
321
322config PPC_HAS_LBARX_LHARX
323 bool
324
325config EARLY_PRINTK
326 bool
327 default y
328
329config PANIC_TIMEOUT
330 int
331 default 180
332
333config COMPAT
334 bool "Enable support for 32bit binaries"
335 depends on PPC64
336 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
337 default y if !CPU_LITTLE_ENDIAN
338 select ARCH_WANT_OLD_COMPAT_IPC
339 select COMPAT_OLD_SIGACTION
340
341config SCHED_OMIT_FRAME_POINTER
342 bool
343 default y
344
345config ARCH_MAY_HAVE_PC_FDC
346 bool
347 default PCI
348
349config PPC_UDBG_16550
350 bool
351
352config GENERIC_TBSYNC
353 bool
354 default y if PPC32 && SMP
355
356config AUDIT_ARCH
357 bool
358 default y
359
360config GENERIC_BUG
361 bool
362 default y
363 depends on BUG
364
365config GENERIC_BUG_RELATIVE_POINTERS
366 def_bool y
367 depends on GENERIC_BUG
368
369config SYS_SUPPORTS_APM_EMULATION
370 default y if PMAC_APM_EMU
371 bool
372
373config EPAPR_BOOT
374 bool
375 help
376 Used to allow a board to specify it wants an ePAPR compliant wrapper.
377
378config DEFAULT_UIMAGE
379 bool
380 help
381 Used to allow a board to specify it wants a uImage built by default
382
383config ARCH_HIBERNATION_POSSIBLE
384 bool
385 default y
386
387config ARCH_SUSPEND_POSSIBLE
388 def_bool y
389 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
390 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
391 || 44x || 40x
392
393config ARCH_SUSPEND_NONZERO_CPU
394 def_bool y
395 depends on PPC_POWERNV || PPC_PSERIES
396
397config ARCH_HAS_ADD_PAGES
398 def_bool y
399 depends on ARCH_ENABLE_MEMORY_HOTPLUG
400
401config PPC_DCR_NATIVE
402 bool
403
404config PPC_DCR_MMIO
405 bool
406
407config PPC_DCR
408 bool
409 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
410 default y
411
412config PPC_PCI_OF_BUS_MAP
413 bool "Use pci_to_OF_bus_map (deprecated)"
414 depends on PPC32
415 depends on PPC_PMAC || PPC_CHRP
416 help
417 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which
418 restricts the system to only having 256 PCI buses. On CHRP it also causes
419 the "pci-OF-bus-map" property to be created in the device tree.
420
421 If unsure, say "N".
422
423config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
424 depends on PPC32
425 depends on !PPC_PCI_OF_BUS_MAP
426 bool "Assign PCI bus numbers from zero individually for each PCI domain"
427 default y
428 help
429 By default on PPC32 were PCI bus numbers unique across all PCI domains.
430 So system could have only 256 PCI buses independently of available
431 PCI domains. When this option is enabled then PCI bus numbers are
432 PCI domain dependent and each PCI controller on own domain can have
433 256 PCI buses, like it is on other Linux architectures.
434
435config PPC_OF_PLATFORM_PCI
436 bool
437 depends on PCI
438 depends on PPC64 # not supported on 32 bits yet
439
440config ARCH_SUPPORTS_UPROBES
441 def_bool y
442
443config PPC_ADV_DEBUG_REGS
444 bool
445 depends on 40x || BOOKE
446 default y
447
448config PPC_ADV_DEBUG_IACS
449 int
450 depends on PPC_ADV_DEBUG_REGS
451 default 4 if 44x
452 default 2
453
454config PPC_ADV_DEBUG_DACS
455 int
456 depends on PPC_ADV_DEBUG_REGS
457 default 2
458
459config PPC_ADV_DEBUG_DVCS
460 int
461 depends on PPC_ADV_DEBUG_REGS
462 default 2 if 44x
463 default 0
464
465config PPC_ADV_DEBUG_DAC_RANGE
466 bool
467 depends on PPC_ADV_DEBUG_REGS && 44x
468 default y
469
470config PPC_DAWR
471 bool
472
473config PGTABLE_LEVELS
474 int
475 default 2 if !PPC64
476 default 4
477
478source "arch/powerpc/sysdev/Kconfig"
479source "arch/powerpc/platforms/Kconfig"
480
481menu "Kernel options"
482
483config HIGHMEM
484 bool "High memory support"
485 depends on PPC32
486 select KMAP_LOCAL
487
488source "kernel/Kconfig.hz"
489
490config MATH_EMULATION
491 bool "Math emulation"
492 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
493 select PPC_FPU_REGS
494 help
495 Some PowerPC chips designed for embedded applications do not have
496 a floating-point unit and therefore do not implement the
497 floating-point instructions in the PowerPC instruction set. If you
498 say Y here, the kernel will include code to emulate a floating-point
499 unit, which will allow programs that use floating-point
500 instructions to run.
501
502 This is also useful to emulate missing (optional) instructions
503 such as fsqrt on cores that do have an FPU but do not implement
504 them (such as Freescale BookE).
505
506choice
507 prompt "Math emulation options"
508 default MATH_EMULATION_FULL
509 depends on MATH_EMULATION
510
511config MATH_EMULATION_FULL
512 bool "Emulate all the floating point instructions"
513 help
514 Select this option will enable the kernel to support to emulate
515 all the floating point instructions. If your SoC doesn't have
516 a FPU, you should select this.
517
518config MATH_EMULATION_HW_UNIMPLEMENTED
519 bool "Just emulate the FPU unimplemented instructions"
520 help
521 Select this if you know there does have a hardware FPU on your
522 SoC, but some floating point instructions are not implemented by that.
523
524endchoice
525
526config PPC_TRANSACTIONAL_MEM
527 bool "Transactional Memory support for POWERPC"
528 depends on PPC_BOOK3S_64
529 depends on SMP
530 select ALTIVEC
531 select VSX
532 help
533 Support user-mode Transactional Memory on POWERPC.
534
535config PPC_UV
536 bool "Ultravisor support"
537 depends on KVM_BOOK3S_HV_POSSIBLE
538 depends on DEVICE_PRIVATE
539 default n
540 help
541 This option paravirtualizes the kernel to run in POWER platforms that
542 supports the Protected Execution Facility (PEF). On such platforms,
543 the ultravisor firmware runs at a privilege level above the
544 hypervisor.
545
546 If unsure, say "N".
547
548config LD_HEAD_STUB_CATCH
549 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
550 depends on PPC64
551 help
552 Very large kernels can cause linker branch stubs to be generated by
553 code in head_64.S, which moves the head text sections out of their
554 specified location. This option can work around the problem.
555
556 If unsure, say "N".
557
558config MPROFILE_KERNEL
559 depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER
560 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN
561 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN
562
563config ARCH_USING_PATCHABLE_FUNCTION_ENTRY
564 depends on FUNCTION_TRACER && (PPC32 || PPC64_ELF_ABI_V2)
565 depends on $(cc-option,-fpatchable-function-entry=2)
566 def_bool y if PPC32
567 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN
568 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN
569
570config HOTPLUG_CPU
571 bool "Support for enabling/disabling CPUs"
572 depends on SMP && (PPC_PSERIES || \
573 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
574 help
575 Say Y here to be able to disable and re-enable individual
576 CPUs at runtime on SMP machines.
577
578 Say N if you are unsure.
579
580config INTERRUPT_SANITIZE_REGISTERS
581 bool "Clear gprs on interrupt arrival"
582 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
583 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
584 help
585 Reduce the influence of user register state on interrupt handlers and
586 syscalls through clearing user state from registers before handling
587 the exception.
588
589config PPC_QUEUED_SPINLOCKS
590 bool "Queued spinlocks" if EXPERT
591 depends on SMP
592 default PPC_BOOK3S_64
593 help
594 Say Y here to use queued spinlocks which give better scalability and
595 fairness on large SMP and NUMA systems without harming single threaded
596 performance.
597
598config ARCH_CPU_PROBE_RELEASE
599 def_bool y
600 depends on HOTPLUG_CPU
601
602config PPC64_SUPPORTS_MEMORY_FAILURE
603 bool "Add support for memory hwpoison"
604 depends on PPC_BOOK3S_64
605 default "y" if PPC_POWERNV
606 select ARCH_SUPPORTS_MEMORY_FAILURE
607
608config ARCH_SUPPORTS_KEXEC
609 def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP)
610
611config ARCH_SUPPORTS_KEXEC_FILE
612 def_bool PPC64
613
614config ARCH_SUPPORTS_KEXEC_PURGATORY
615 def_bool y
616
617config ARCH_SELECTS_KEXEC_FILE
618 def_bool y
619 depends on KEXEC_FILE
620 select KEXEC_ELF
621 select HAVE_IMA_KEXEC if IMA
622
623config PPC64_BIG_ENDIAN_ELF_ABI_V2
624 # Option is available to BFD, but LLD does not support ELFv1 so this is
625 # always true there.
626 prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT
627 def_bool y
628 depends on PPC64 && CPU_BIG_ENDIAN
629 depends on CC_HAS_ELFV2
630 help
631 This builds the kernel image using the "Power Architecture 64-Bit ELF
632 V2 ABI Specification", which has a reduced stack overhead and faster
633 function calls. This internal kernel ABI option does not affect
634 userspace compatibility.
635
636 The V2 ABI is standard for 64-bit little-endian, but for big-endian
637 it is less well tested by kernel and toolchain. However some distros
638 build userspace this way, and it can produce a functioning kernel.
639
640config RELOCATABLE
641 bool "Build a relocatable kernel"
642 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
643 select NONSTATIC_KERNEL
644 help
645 This builds a kernel image that is capable of running at the
646 location the kernel is loaded at. For ppc32, there is no any
647 alignment restrictions, and this feature is a superset of
648 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
649 16k-aligned base address. The kernel is linked as a
650 position-independent executable (PIE) and contains dynamic relocations
651 which are processed early in the bootup process.
652
653 One use is for the kexec on panic case where the recovery kernel
654 must live at a different physical address than the primary
655 kernel.
656
657 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
658 it has been loaded at and the compile time physical addresses
659 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
660 setting can still be useful to bootwrappers that need to know the
661 load address of the kernel (eg. u-boot/mkimage).
662
663config RANDOMIZE_BASE
664 bool "Randomize the address of the kernel image"
665 depends on PPC_85xx && FLATMEM
666 depends on RELOCATABLE
667 help
668 Randomizes the virtual address at which the kernel image is
669 loaded, as a security feature that deters exploit attempts
670 relying on knowledge of the location of kernel internals.
671
672 If unsure, say Y.
673
674config RELOCATABLE_TEST
675 bool "Test relocatable kernel"
676 depends on (PPC64 && RELOCATABLE)
677 help
678 This runs the relocatable kernel at the address it was initially
679 loaded at, which tends to be non-zero and therefore test the
680 relocation code.
681
682config ARCH_SUPPORTS_CRASH_DUMP
683 def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
684
685config ARCH_SELECTS_CRASH_DUMP
686 def_bool y
687 depends on CRASH_DUMP
688 select RELOCATABLE if PPC64 || 44x || PPC_85xx
689
690config FA_DUMP
691 bool "Firmware-assisted dump"
692 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
693 select CRASH_CORE
694 select CRASH_DUMP
695 help
696 A robust mechanism to get reliable kernel crash dump with
697 assistance from firmware. This approach does not use kexec,
698 instead firmware assists in booting the capture kernel
699 while preserving memory contents. Firmware-assisted dump
700 is meant to be a kdump replacement offering robustness and
701 speed not possible without system firmware assistance.
702
703 If unsure, say "y". Only special kernels like petitboot may
704 need to say "N" here.
705
706config PRESERVE_FA_DUMP
707 bool "Preserve Firmware-assisted dump"
708 depends on PPC64 && PPC_POWERNV && !FA_DUMP
709 help
710 On a kernel with FA_DUMP disabled, this option helps to preserve
711 crash data from a previously crash'ed kernel. Useful when the next
712 memory preserving kernel boot would process this crash data.
713 Petitboot kernel is the typical usecase for this option.
714
715config OPAL_CORE
716 bool "Export OPAL memory as /sys/firmware/opal/core"
717 depends on PPC64 && PPC_POWERNV
718 help
719 This option uses the MPIPL support in firmware to provide an
720 ELF core of OPAL memory after a crash. The ELF core is exported
721 as /sys/firmware/opal/core file which is helpful in debugging
722 OPAL crashes using GDB.
723
724config IRQ_ALL_CPUS
725 bool "Distribute interrupts on all CPUs by default"
726 depends on SMP
727 help
728 This option gives the kernel permission to distribute IRQs across
729 multiple CPUs. Saying N here will route all IRQs to the first
730 CPU. Generally saying Y is safe, although some problems have been
731 reported with SMP Power Macintoshes with this option enabled.
732
733config NUMA
734 bool "NUMA Memory Allocation and Scheduler Support"
735 depends on PPC64 && SMP
736 default y if PPC_PSERIES || PPC_POWERNV
737 select USE_PERCPU_NUMA_NODE_ID
738 help
739 Enable NUMA (Non-Uniform Memory Access) support.
740
741 The kernel will try to allocate memory used by a CPU on the
742 local memory controller of the CPU and add some more
743 NUMA awareness to the kernel.
744
745config NODES_SHIFT
746 int
747 default "8" if PPC64
748 default "4"
749 depends on NUMA
750
751config HAVE_MEMORYLESS_NODES
752 def_bool y
753 depends on NUMA
754
755config ARCH_SELECT_MEMORY_MODEL
756 def_bool y
757 depends on PPC64
758
759config ARCH_FLATMEM_ENABLE
760 def_bool y
761 depends on (PPC64 && !NUMA) || PPC32
762
763config ARCH_SPARSEMEM_ENABLE
764 def_bool y
765 depends on PPC64
766 select SPARSEMEM_VMEMMAP_ENABLE
767
768config ARCH_SPARSEMEM_DEFAULT
769 def_bool y
770 depends on PPC_BOOK3S_64
771
772config ILLEGAL_POINTER_VALUE
773 hex
774 # This is roughly half way between the top of user space and the bottom
775 # of kernel space, which seems about as good as we can get.
776 default 0x5deadbeef0000000 if PPC64
777 default 0
778
779config ARCH_MEMORY_PROBE
780 def_bool y
781 depends on MEMORY_HOTPLUG
782
783choice
784 prompt "Page size"
785 default PPC_64K_PAGES if PPC_BOOK3S_64
786 default PPC_4K_PAGES
787 help
788 Select the kernel logical page size. Increasing the page size
789 will reduce software overhead at each page boundary, allow
790 hardware prefetch mechanisms to be more effective, and allow
791 larger dma transfers increasing IO efficiency and reducing
792 overhead. However the utilization of memory will increase.
793 For example, each cached file will using a multiple of the
794 page size to hold its contents and the difference between the
795 end of file and the end of page is wasted.
796
797 Some dedicated systems, such as software raid serving with
798 accelerated calculations, have shown significant increases.
799
800 If you configure a 64 bit kernel for 64k pages but the
801 processor does not support them, then the kernel will simulate
802 them with 4k pages, loading them on demand, but with the
803 reduced software overhead and larger internal fragmentation.
804 For the 32 bit kernel, a large page option will not be offered
805 unless it is supported by the configured processor.
806
807 If unsure, choose 4K_PAGES.
808
809config PPC_4K_PAGES
810 bool "4k page size"
811 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
812
813config PPC_16K_PAGES
814 bool "16k page size"
815 depends on 44x || PPC_8xx
816
817config PPC_64K_PAGES
818 bool "64k page size"
819 depends on 44x || PPC_BOOK3S_64
820 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
821
822config PPC_256K_PAGES
823 bool "256k page size (Requires non-standard binutils settings)"
824 depends on 44x && !PPC_47x
825 help
826 Make the page size 256k.
827
828 The kernel will only be able to run applications that have been
829 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
830 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
831 definition from 0x10000 to 0x40000 in older versions.
832
833endchoice
834
835config PAGE_SIZE_4KB
836 def_bool y
837 depends on PPC_4K_PAGES
838
839config PAGE_SIZE_16KB
840 def_bool y
841 depends on PPC_16K_PAGES
842
843config PAGE_SIZE_64KB
844 def_bool y
845 depends on PPC_64K_PAGES
846
847config PAGE_SIZE_256KB
848 def_bool y
849 depends on PPC_256K_PAGES
850
851config PPC_PAGE_SHIFT
852 int
853 default 18 if PPC_256K_PAGES
854 default 16 if PPC_64K_PAGES
855 default 14 if PPC_16K_PAGES
856 default 12
857
858config THREAD_SHIFT
859 int "Thread shift" if EXPERT
860 range 13 15
861 default "15" if PPC_256K_PAGES
862 default "15" if PPC_PSERIES || PPC_POWERNV
863 default "14" if PPC64
864 default "13"
865 help
866 Used to define the stack size. The default is almost always what you
867 want. Only change this if you know what you are doing.
868
869config DATA_SHIFT_BOOL
870 bool "Set custom data alignment"
871 depends on ADVANCED_OPTIONS
872 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
873 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
874 PPC_85xx
875 help
876 This option allows you to set the kernel data alignment. When
877 RAM is mapped by blocks, the alignment needs to fit the size and
878 number of possible blocks. The default should be OK for most configs.
879
880 Say N here unless you know what you are doing.
881
882config DATA_SHIFT
883 int "Data shift" if DATA_SHIFT_BOOL
884 default 24 if STRICT_KERNEL_RWX && PPC64
885 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
886 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
887 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
888 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
889 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
890 default 23 if STRICT_KERNEL_RWX && PPC_8xx
891 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
892 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
893 default 24 if STRICT_KERNEL_RWX && PPC_85xx
894 default PPC_PAGE_SHIFT
895 help
896 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
897 Smaller is the alignment, greater is the number of necessary DBATs.
898
899 On 8xx, large pages (512kb or 8M) are used to map kernel linear
900 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
901 in that case. If PIN_TLB is selected, it must be aligned to 8M as
902 8M pages will be pinned.
903
904config ARCH_FORCE_MAX_ORDER
905 int "Order of maximal physically contiguous allocations"
906 range 7 8 if PPC64 && PPC_64K_PAGES
907 default "8" if PPC64 && PPC_64K_PAGES
908 range 12 12 if PPC64 && !PPC_64K_PAGES
909 default "12" if PPC64 && !PPC_64K_PAGES
910 range 8 10 if PPC32 && PPC_16K_PAGES
911 default "8" if PPC32 && PPC_16K_PAGES
912 range 6 10 if PPC32 && PPC_64K_PAGES
913 default "6" if PPC32 && PPC_64K_PAGES
914 range 4 10 if PPC32 && PPC_256K_PAGES
915 default "4" if PPC32 && PPC_256K_PAGES
916 range 10 12
917 default "10"
918 help
919 The kernel page allocator limits the size of maximal physically
920 contiguous allocations. The limit is called MAX_PAGE_ORDER and it
921 defines the maximal power of two of number of pages that can be
922 allocated as a single contiguous block. This option allows
923 overriding the default setting when ability to allocate very
924 large blocks of physically contiguous memory is required.
925
926 The page size is not necessarily 4KB. For example, on 64-bit
927 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
928 this in mind when choosing a value for this option.
929
930 Don't change if unsure.
931
932config PPC_SUBPAGE_PROT
933 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
934 default n
935 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
936 help
937 This option adds support for system call to allow user programs
938 to set access permissions (read/write, readonly, or no access)
939 on the 4k subpages of each 64k page.
940
941 If unsure, say N here.
942
943config PPC_PROT_SAO_LPAR
944 bool "Support PROT_SAO mappings in LPARs"
945 depends on PPC_BOOK3S_64
946 help
947 This option adds support for PROT_SAO mappings from userspace
948 inside LPARs on supported CPUs.
949
950 This may cause issues when performing guest migration from
951 a CPU that supports SAO to one that does not.
952
953 If unsure, say N here.
954
955config PPC_COPRO_BASE
956 bool
957
958config SCHED_SMT
959 bool "SMT (Hyperthreading) scheduler support"
960 depends on PPC64 && SMP
961 help
962 SMT scheduler support improves the CPU scheduler's decision making
963 when dealing with POWER5 cpus at a cost of slightly increased
964 overhead in some places. If unsure say N here.
965
966config PPC_DENORMALISATION
967 bool "PowerPC denormalisation exception handling"
968 depends on PPC_BOOK3S_64
969 default "y" if PPC_POWERNV
970 help
971 Add support for handling denormalisation of single precision
972 values. Useful for bare metal only. If unsure say Y here.
973
974config CMDLINE
975 string "Initial kernel command string"
976 default ""
977 help
978 On some platforms, there is currently no way for the boot loader to
979 pass arguments to the kernel. For these platforms, you can supply
980 some command-line options at build time by entering them here. In
981 most cases you will need to specify the root device here.
982
983choice
984 prompt "Kernel command line type" if CMDLINE != ""
985 default CMDLINE_FROM_BOOTLOADER
986
987config CMDLINE_FROM_BOOTLOADER
988 bool "Use bootloader kernel arguments if available"
989 help
990 Uses the command-line options passed by the boot loader. If
991 the boot loader doesn't provide any, the default kernel command
992 string provided in CMDLINE will be used.
993
994config CMDLINE_EXTEND
995 bool "Extend bootloader kernel arguments"
996 help
997 The command-line arguments provided by the boot loader will be
998 appended to the default kernel command string.
999
1000config CMDLINE_FORCE
1001 bool "Always use the default kernel command string"
1002 help
1003 Always use the default kernel command string, even if the boot
1004 loader passes other arguments to the kernel.
1005 This is useful if you cannot or don't want to change the
1006 command-line options your boot loader passes to the kernel.
1007
1008endchoice
1009
1010config EXTRA_TARGETS
1011 string "Additional default image types"
1012 help
1013 List additional targets to be built by the bootwrapper here (separated
1014 by spaces). This is useful for targets that depend of device tree
1015 files in the .dts directory.
1016
1017 Targets in this list will be build as part of the default build
1018 target, or when the user does a 'make zImage' or a
1019 'make zImage.initrd'.
1020
1021 If unsure, leave blank
1022
1023config ARCH_WANTS_FREEZER_CONTROL
1024 def_bool y
1025 depends on ADB_PMU
1026
1027source "kernel/power/Kconfig"
1028
1029config PPC_MEM_KEYS
1030 prompt "PowerPC Memory Protection Keys"
1031 def_bool y
1032 depends on PPC_BOOK3S_64
1033 depends on PPC_64S_HASH_MMU
1034 select ARCH_USES_HIGH_VMA_FLAGS
1035 select ARCH_HAS_PKEYS
1036 help
1037 Memory Protection Keys provides a mechanism for enforcing
1038 page-based protections, but without requiring modification of the
1039 page tables when an application changes protection domains.
1040
1041 For details, see Documentation/core-api/protection-keys.rst
1042
1043 If unsure, say y.
1044
1045config PPC_SECURE_BOOT
1046 prompt "Enable secure boot support"
1047 bool
1048 depends on PPC_POWERNV || PPC_PSERIES
1049 depends on IMA_ARCH_POLICY
1050 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1051 select PSERIES_PLPKS if PPC_PSERIES
1052 help
1053 Systems with firmware secure boot enabled need to define security
1054 policies to extend secure boot to the OS. This config allows a user
1055 to enable OS secure boot on systems that have firmware support for
1056 it. If in doubt say N.
1057
1058config PPC_SECVAR_SYSFS
1059 bool "Enable sysfs interface for POWER secure variables"
1060 default y
1061 depends on PPC_SECURE_BOOT
1062 depends on SYSFS
1063 help
1064 POWER secure variables are managed and controlled by firmware.
1065 These variables are exposed to userspace via sysfs to enable
1066 read/write operations on these variables. Say Y if you have
1067 secure boot enabled and want to expose variables to userspace.
1068
1069endmenu
1070
1071config ISA_DMA_API
1072 bool
1073 default PCI
1074
1075menu "Bus options"
1076
1077config ISA
1078 bool "Support for ISA-bus hardware"
1079 depends on PPC_CHRP
1080 select PPC_I8259
1081 help
1082 Find out whether you have ISA slots on your motherboard. ISA is the
1083 name of a bus system, i.e. the way the CPU talks to the other stuff
1084 inside your box. If you have an Apple machine, say N here; if you
1085 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1086 embedded board, consult your board documentation.
1087
1088config GENERIC_ISA_DMA
1089 bool
1090 depends on ISA_DMA_API
1091 default y
1092
1093config PPC_INDIRECT_PCI
1094 bool
1095 depends on PCI
1096 default y if 40x || 44x
1097
1098config SBUS
1099 bool
1100
1101config FSL_SOC
1102 bool
1103
1104config FSL_PCI
1105 bool
1106 select ARCH_HAS_DMA_SET_MASK
1107 select PPC_INDIRECT_PCI
1108 select PCI_QUIRKS
1109
1110config FSL_PMC
1111 bool
1112 default y
1113 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1114 help
1115 Freescale MPC85xx/MPC86xx power management controller support
1116 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1117
1118config PPC4xx_CPM
1119 bool
1120 default y
1121 depends on SUSPEND && (44x || 40x)
1122 help
1123 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1124 It also enables support for two different idle states (idle-wait
1125 and idle-doze).
1126
1127config 4xx_SOC
1128 bool
1129
1130config FSL_LBC
1131 bool "Freescale Local Bus support"
1132 help
1133 Enables reporting of errors from the Freescale local bus
1134 controller. Also contains some common code used by
1135 drivers for specific local bus peripherals.
1136
1137config FSL_GTM
1138 bool
1139 depends on PPC_83xx || QUICC_ENGINE || CPM2
1140 help
1141 Freescale General-purpose Timers support
1142
1143config FSL_RIO
1144 bool "Freescale Embedded SRIO Controller support"
1145 depends on RAPIDIO = y && HAVE_RAPIDIO
1146 default "n"
1147 help
1148 Include support for RapidIO controller on Freescale embedded
1149 processors (MPC8548, MPC8641, etc).
1150
1151endmenu
1152
1153config NONSTATIC_KERNEL
1154 bool
1155
1156menu "Advanced setup"
1157 depends on PPC32
1158
1159config ADVANCED_OPTIONS
1160 bool "Prompt for advanced kernel configuration options"
1161 help
1162 This option will enable prompting for a variety of advanced kernel
1163 configuration options. These options can cause the kernel to not
1164 work if they are set incorrectly, but can be used to optimize certain
1165 aspects of kernel memory management.
1166
1167 Unless you know what you are doing, say N here.
1168
1169comment "Default settings for advanced configuration options are used"
1170 depends on !ADVANCED_OPTIONS
1171
1172config LOWMEM_SIZE_BOOL
1173 bool "Set maximum low memory"
1174 depends on ADVANCED_OPTIONS
1175 help
1176 This option allows you to set the maximum amount of memory which
1177 will be used as "low memory", that is, memory which the kernel can
1178 access directly, without having to set up a kernel virtual mapping.
1179 This can be useful in optimizing the layout of kernel virtual
1180 memory.
1181
1182 Say N here unless you know what you are doing.
1183
1184config LOWMEM_SIZE
1185 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1186 default "0x30000000"
1187
1188config LOWMEM_CAM_NUM_BOOL
1189 bool "Set number of CAMs to use to map low memory"
1190 depends on ADVANCED_OPTIONS && PPC_85xx
1191 help
1192 This option allows you to set the maximum number of CAM slots that
1193 will be used to map low memory. There are a limited number of slots
1194 available and even more limited number that will fit in the L1 MMU.
1195 However, using more entries will allow mapping more low memory. This
1196 can be useful in optimizing the layout of kernel virtual memory.
1197
1198 Say N here unless you know what you are doing.
1199
1200config LOWMEM_CAM_NUM
1201 depends on PPC_85xx
1202 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1203 default 3 if !STRICT_KERNEL_RWX
1204 default 9 if DATA_SHIFT >= 24
1205 default 12 if DATA_SHIFT >= 22
1206 default 15
1207
1208config DYNAMIC_MEMSTART
1209 bool "Enable page aligned dynamic load address for kernel"
1210 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1211 select NONSTATIC_KERNEL
1212 help
1213 This option enables the kernel to be loaded at any page aligned
1214 physical address. The kernel creates a mapping from KERNELBASE to
1215 the address where the kernel is loaded. The page size here implies
1216 the TLB page size of the mapping for kernel on the particular platform.
1217 Please refer to the init code for finding the TLB page size.
1218
1219 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1220 kernel image, where the only restriction is the page aligned kernel
1221 load address. When this option is enabled, the compile time physical
1222 address CONFIG_PHYSICAL_START is ignored.
1223
1224 This option is overridden by CONFIG_RELOCATABLE
1225
1226config PAGE_OFFSET_BOOL
1227 bool "Set custom page offset address"
1228 depends on ADVANCED_OPTIONS
1229 help
1230 This option allows you to set the kernel virtual address at which
1231 the kernel will map low memory. This can be useful in optimizing
1232 the virtual memory layout of the system.
1233
1234 Say N here unless you know what you are doing.
1235
1236config PAGE_OFFSET
1237 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1238 default "0xc0000000"
1239
1240config KERNEL_START_BOOL
1241 bool "Set custom kernel base address"
1242 depends on ADVANCED_OPTIONS
1243 help
1244 This option allows you to set the kernel virtual address at which
1245 the kernel will be loaded. Normally this should match PAGE_OFFSET
1246 however there are times (like kdump) that one might not want them
1247 to be the same.
1248
1249 Say N here unless you know what you are doing.
1250
1251config KERNEL_START
1252 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1253 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1254 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1255 default "0xc0000000"
1256
1257config PHYSICAL_START_BOOL
1258 bool "Set physical address where the kernel is loaded"
1259 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1260 help
1261 This gives the physical address where the kernel is loaded.
1262
1263 Say N here unless you know what you are doing.
1264
1265config PHYSICAL_START
1266 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1267 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1268 default "0x00000000"
1269
1270config PHYSICAL_ALIGN
1271 hex
1272 default "0x04000000" if PPC_85xx
1273 help
1274 This value puts the alignment restrictions on physical address
1275 where kernel is loaded and run from. Kernel is compiled for an
1276 address which meets above alignment restriction.
1277
1278config TASK_SIZE_BOOL
1279 bool "Set custom user task size"
1280 depends on ADVANCED_OPTIONS
1281 help
1282 This option allows you to set the amount of virtual address space
1283 allocated to user tasks. This can be useful in optimizing the
1284 virtual memory layout of the system.
1285
1286 Say N here unless you know what you are doing.
1287
1288config TASK_SIZE
1289 hex "Size of user task space" if TASK_SIZE_BOOL
1290 default "0x80000000" if PPC_8xx
1291 default "0xb0000000" if PPC_BOOK3S_32
1292 default "0xc0000000"
1293endmenu
1294
1295if PPC64
1296# This value must have zeroes in the bottom 60 bits otherwise lots will break
1297config PAGE_OFFSET
1298 hex
1299 default "0xc000000000000000"
1300config KERNEL_START
1301 hex
1302 default "0xc000000000000000"
1303config PHYSICAL_START
1304 hex
1305 default "0x00000000"
1306endif
1307
1308config PPC_LIB_RHEAP
1309 bool
1310
1311source "arch/powerpc/kvm/Kconfig"
1312
1313source "kernel/livepatch/Kconfig"
1source "arch/powerpc/platforms/Kconfig.cputype"
2
3config PPC32
4 bool
5 default y if !PPC64
6
7config 32BIT
8 bool
9 default y if PPC32
10
11config 64BIT
12 bool
13 default y if PPC64
14
15config WORD_SIZE
16 int
17 default 64 if PPC64
18 default 32 if !PPC64
19
20config ARCH_PHYS_ADDR_T_64BIT
21 def_bool PPC64 || PHYS_64BIT
22
23config ARCH_DMA_ADDR_T_64BIT
24 def_bool ARCH_PHYS_ADDR_T_64BIT
25
26config MMU
27 bool
28 default y
29
30config HAVE_SETUP_PER_CPU_AREA
31 def_bool PPC64
32
33config NEED_PER_CPU_EMBED_FIRST_CHUNK
34 def_bool PPC64
35
36config NR_IRQS
37 int "Number of virtual interrupt numbers"
38 range 32 32768
39 default "512"
40 help
41 This defines the number of virtual interrupt numbers the kernel
42 can manage. Virtual interrupt numbers are what you see in
43 /proc/interrupts. If you configure your system to have too few,
44 drivers will fail to load or worse - handle with care.
45
46config STACKTRACE_SUPPORT
47 bool
48 default y
49
50config HAVE_LATENCYTOP_SUPPORT
51 def_bool y
52
53config TRACE_IRQFLAGS_SUPPORT
54 bool
55 default y
56
57config LOCKDEP_SUPPORT
58 bool
59 default y
60
61config RWSEM_GENERIC_SPINLOCK
62 bool
63
64config RWSEM_XCHGADD_ALGORITHM
65 bool
66 default y
67
68config GENERIC_LOCKBREAK
69 bool
70 default y
71 depends on SMP && PREEMPT
72
73config ARCH_HAS_ILOG2_U32
74 bool
75 default y
76
77config ARCH_HAS_ILOG2_U64
78 bool
79 default y if 64BIT
80
81config GENERIC_HWEIGHT
82 bool
83 default y
84
85config GENERIC_GPIO
86 bool
87 help
88 Generic GPIO API support
89
90config ARCH_NO_VIRT_TO_BUS
91 def_bool PPC64
92
93config PPC
94 bool
95 default y
96 select OF
97 select OF_EARLY_FLATTREE
98 select HAVE_FTRACE_MCOUNT_RECORD
99 select HAVE_DYNAMIC_FTRACE
100 select HAVE_FUNCTION_TRACER
101 select HAVE_FUNCTION_GRAPH_TRACER
102 select ARCH_WANT_OPTIONAL_GPIOLIB
103 select HAVE_IDE
104 select HAVE_IOREMAP_PROT
105 select HAVE_EFFICIENT_UNALIGNED_ACCESS
106 select HAVE_KPROBES
107 select HAVE_ARCH_KGDB
108 select HAVE_KRETPROBES
109 select HAVE_ARCH_TRACEHOOK
110 select HAVE_MEMBLOCK
111 select HAVE_MEMBLOCK_NODE_MAP
112 select HAVE_DMA_ATTRS
113 select HAVE_DMA_API_DEBUG
114 select USE_GENERIC_SMP_HELPERS if SMP
115 select HAVE_OPROFILE
116 select HAVE_SYSCALL_WRAPPERS if PPC64
117 select GENERIC_ATOMIC64 if PPC32
118 select HAVE_IRQ_WORK
119 select HAVE_PERF_EVENTS
120 select HAVE_REGS_AND_STACK_ACCESS_API
121 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
122 select HAVE_GENERIC_HARDIRQS
123 select SPARSE_IRQ
124 select IRQ_PER_CPU
125 select IRQ_DOMAIN
126 select GENERIC_IRQ_SHOW
127 select GENERIC_IRQ_SHOW_LEVEL
128 select IRQ_FORCED_THREADING
129 select HAVE_RCU_TABLE_FREE if SMP
130 select HAVE_SYSCALL_TRACEPOINTS
131 select HAVE_BPF_JIT if PPC64
132 select HAVE_ARCH_JUMP_LABEL
133 select ARCH_HAVE_NMI_SAFE_CMPXCHG
134 select GENERIC_SMP_IDLE_THREAD
135 select GENERIC_CMOS_UPDATE
136 select GENERIC_TIME_VSYSCALL
137 select GENERIC_CLOCKEVENTS
138 select GENERIC_STRNCPY_FROM_USER
139 select GENERIC_STRNLEN_USER
140
141config EARLY_PRINTK
142 bool
143 default y
144
145config COMPAT
146 bool
147 default y if PPC64
148 select COMPAT_BINFMT_ELF
149 select ARCH_WANT_OLD_COMPAT_IPC
150
151config SYSVIPC_COMPAT
152 bool
153 depends on COMPAT && SYSVIPC
154 default y
155
156# All PPC32s use generic nvram driver through ppc_md
157config GENERIC_NVRAM
158 bool
159 default y if PPC32
160
161config SCHED_OMIT_FRAME_POINTER
162 bool
163 default y
164
165config ARCH_MAY_HAVE_PC_FDC
166 bool
167 default !PPC_PSERIES || PCI
168
169config PPC_OF
170 def_bool y
171
172config PPC_UDBG_16550
173 bool
174 default n
175
176config GENERIC_TBSYNC
177 bool
178 default y if PPC32 && SMP
179 default n
180
181config AUDIT_ARCH
182 bool
183 default y
184
185config GENERIC_BUG
186 bool
187 default y
188 depends on BUG
189
190config SYS_SUPPORTS_APM_EMULATION
191 default y if PMAC_APM_EMU
192 bool
193
194config EPAPR_BOOT
195 bool
196 help
197 Used to allow a board to specify it wants an ePAPR compliant wrapper.
198 default n
199
200config DEFAULT_UIMAGE
201 bool
202 help
203 Used to allow a board to specify it wants a uImage built by default
204 default n
205
206config REDBOOT
207 bool
208
209config ARCH_HIBERNATION_POSSIBLE
210 bool
211 default y
212
213config ARCH_SUSPEND_POSSIBLE
214 def_bool y
215 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
216 (PPC_85xx && !SMP) || PPC_86xx || PPC_PSERIES || 44x || 40x
217
218config PPC_DCR_NATIVE
219 bool
220 default n
221
222config PPC_DCR_MMIO
223 bool
224 default n
225
226config PPC_DCR
227 bool
228 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
229 default y
230
231config PPC_OF_PLATFORM_PCI
232 bool
233 depends on PCI
234 depends on PPC64 # not supported on 32 bits yet
235 default n
236
237config ARCH_SUPPORTS_DEBUG_PAGEALLOC
238 def_bool y
239
240config PPC_ADV_DEBUG_REGS
241 bool
242 depends on 40x || BOOKE
243 default y
244
245config PPC_ADV_DEBUG_IACS
246 int
247 depends on PPC_ADV_DEBUG_REGS
248 default 4 if 44x
249 default 2
250
251config PPC_ADV_DEBUG_DACS
252 int
253 depends on PPC_ADV_DEBUG_REGS
254 default 2
255
256config PPC_ADV_DEBUG_DVCS
257 int
258 depends on PPC_ADV_DEBUG_REGS
259 default 2 if 44x
260 default 0
261
262config PPC_ADV_DEBUG_DAC_RANGE
263 bool
264 depends on PPC_ADV_DEBUG_REGS && 44x
265 default y
266
267source "init/Kconfig"
268
269source "kernel/Kconfig.freezer"
270
271source "arch/powerpc/sysdev/Kconfig"
272source "arch/powerpc/platforms/Kconfig"
273
274menu "Kernel options"
275
276config HIGHMEM
277 bool "High memory support"
278 depends on PPC32
279
280source kernel/Kconfig.hz
281source kernel/Kconfig.preempt
282source "fs/Kconfig.binfmt"
283
284config HUGETLB_PAGE_SIZE_VARIABLE
285 bool
286 depends on HUGETLB_PAGE
287 default y
288
289config MATH_EMULATION
290 bool "Math emulation"
291 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
292 ---help---
293 Some PowerPC chips designed for embedded applications do not have
294 a floating-point unit and therefore do not implement the
295 floating-point instructions in the PowerPC instruction set. If you
296 say Y here, the kernel will include code to emulate a floating-point
297 unit, which will allow programs that use floating-point
298 instructions to run.
299
300config 8XX_MINIMAL_FPEMU
301 bool "Minimal math emulation for 8xx"
302 depends on 8xx && !MATH_EMULATION
303 help
304 Older arch/ppc kernels still emulated a few floating point
305 instructions such as load and store, even when full math
306 emulation is disabled. Say "Y" here if you want to preserve
307 this behavior.
308
309 It is recommended that you build a soft-float userspace instead.
310
311config IOMMU_HELPER
312 def_bool PPC64
313
314config SWIOTLB
315 bool "SWIOTLB support"
316 default n
317 select IOMMU_HELPER
318 ---help---
319 Support for IO bounce buffering for systems without an IOMMU.
320 This allows us to DMA to the full physical address space on
321 platforms where the size of a physical address is larger
322 than the bus address. Not all platforms support this.
323
324config HOTPLUG_CPU
325 bool "Support for enabling/disabling CPUs"
326 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC || PPC_POWERNV)
327 ---help---
328 Say Y here to be able to disable and re-enable individual
329 CPUs at runtime on SMP machines.
330
331 Say N if you are unsure.
332
333config ARCH_CPU_PROBE_RELEASE
334 def_bool y
335 depends on HOTPLUG_CPU
336
337config ARCH_ENABLE_MEMORY_HOTPLUG
338 def_bool y
339
340config ARCH_HAS_WALK_MEMORY
341 def_bool y
342
343config ARCH_ENABLE_MEMORY_HOTREMOVE
344 def_bool y
345
346config KEXEC
347 bool "kexec system call (EXPERIMENTAL)"
348 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) && EXPERIMENTAL
349 help
350 kexec is a system call that implements the ability to shutdown your
351 current kernel, and to start another kernel. It is like a reboot
352 but it is independent of the system firmware. And like a reboot
353 you can start any kernel with it, not just Linux.
354
355 The name comes from the similarity to the exec system call.
356
357 It is an ongoing process to be certain the hardware in a machine
358 is properly shutdown, so do not be surprised if this code does not
359 initially work for you. It may help to enable device hotplugging
360 support. As of this writing the exact hardware interface is
361 strongly in flux, so no good recommendation can be made.
362
363config CRASH_DUMP
364 bool "Build a kdump crash kernel"
365 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
366 select RELOCATABLE if PPC64 || 44x
367 select DYNAMIC_MEMSTART if FSL_BOOKE
368 help
369 Build a kernel suitable for use as a kdump capture kernel.
370 The same kernel binary can be used as production kernel and dump
371 capture kernel.
372
373config FA_DUMP
374 bool "Firmware-assisted dump"
375 depends on PPC64 && PPC_RTAS && CRASH_DUMP
376 help
377 A robust mechanism to get reliable kernel crash dump with
378 assistance from firmware. This approach does not use kexec,
379 instead firmware assists in booting the kdump kernel
380 while preserving memory contents. Firmware-assisted dump
381 is meant to be a kdump replacement offering robustness and
382 speed not possible without system firmware assistance.
383
384 If unsure, say "N"
385
386config IRQ_ALL_CPUS
387 bool "Distribute interrupts on all CPUs by default"
388 depends on SMP && !MV64360
389 help
390 This option gives the kernel permission to distribute IRQs across
391 multiple CPUs. Saying N here will route all IRQs to the first
392 CPU. Generally saying Y is safe, although some problems have been
393 reported with SMP Power Macintoshes with this option enabled.
394
395config NUMA
396 bool "NUMA support"
397 depends on PPC64
398 default y if SMP && PPC_PSERIES
399
400config NODES_SHIFT
401 int
402 default "8" if PPC64
403 default "4"
404 depends on NEED_MULTIPLE_NODES
405
406config MAX_ACTIVE_REGIONS
407 int
408 default "256" if PPC64
409 default "32"
410
411config ARCH_SELECT_MEMORY_MODEL
412 def_bool y
413 depends on PPC64
414
415config ARCH_FLATMEM_ENABLE
416 def_bool y
417 depends on (PPC64 && !NUMA) || PPC32
418
419config ARCH_SPARSEMEM_ENABLE
420 def_bool y
421 depends on PPC64
422 select SPARSEMEM_VMEMMAP_ENABLE
423
424config ARCH_SPARSEMEM_DEFAULT
425 def_bool y
426 depends on (SMP && PPC_PSERIES) || PPC_PS3
427
428config SYS_SUPPORTS_HUGETLBFS
429 bool
430
431source "mm/Kconfig"
432
433config ARCH_MEMORY_PROBE
434 def_bool y
435 depends on MEMORY_HOTPLUG
436
437# Some NUMA nodes have memory ranges that span
438# other nodes. Even though a pfn is valid and
439# between a node's start and end pfns, it may not
440# reside on that node. See memmap_init_zone()
441# for details.
442config NODES_SPAN_OTHER_NODES
443 def_bool y
444 depends on NEED_MULTIPLE_NODES
445
446config PPC_HAS_HASH_64K
447 bool
448 depends on PPC64
449 default n
450
451config STDBINUTILS
452 bool "Using standard binutils settings"
453 depends on 44x
454 default y
455 help
456 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
457 Note, that kernel will be able to run only those applications,
458 which had been compiled using binutils later than 2.17.50.0.3 with
459 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
460 the older binutils, you can patch them with a trivial patch, which
461 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
462
463choice
464 prompt "Page size"
465 default PPC_4K_PAGES
466 help
467 Select the kernel logical page size. Increasing the page size
468 will reduce software overhead at each page boundary, allow
469 hardware prefetch mechanisms to be more effective, and allow
470 larger dma transfers increasing IO efficiency and reducing
471 overhead. However the utilization of memory will increase.
472 For example, each cached file will using a multiple of the
473 page size to hold its contents and the difference between the
474 end of file and the end of page is wasted.
475
476 Some dedicated systems, such as software raid serving with
477 accelerated calculations, have shown significant increases.
478
479 If you configure a 64 bit kernel for 64k pages but the
480 processor does not support them, then the kernel will simulate
481 them with 4k pages, loading them on demand, but with the
482 reduced software overhead and larger internal fragmentation.
483 For the 32 bit kernel, a large page option will not be offered
484 unless it is supported by the configured processor.
485
486 If unsure, choose 4K_PAGES.
487
488config PPC_4K_PAGES
489 bool "4k page size"
490
491config PPC_16K_PAGES
492 bool "16k page size" if 44x
493
494config PPC_64K_PAGES
495 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
496 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
497
498config PPC_256K_PAGES
499 bool "256k page size" if 44x
500 depends on !STDBINUTILS
501 help
502 Make the page size 256k.
503
504 As the ELF standard only requires alignment to support page
505 sizes up to 64k, you will need to compile all of your user
506 space applications with a non-standard binutils settings
507 (see the STDBINUTILS description for details).
508
509 Say N unless you know what you are doing.
510
511endchoice
512
513config FORCE_MAX_ZONEORDER
514 int "Maximum zone order"
515 range 9 64 if PPC64 && PPC_64K_PAGES
516 default "9" if PPC64 && PPC_64K_PAGES
517 range 13 64 if PPC64 && !PPC_64K_PAGES
518 default "13" if PPC64 && !PPC_64K_PAGES
519 range 9 64 if PPC32 && PPC_16K_PAGES
520 default "9" if PPC32 && PPC_16K_PAGES
521 range 7 64 if PPC32 && PPC_64K_PAGES
522 default "7" if PPC32 && PPC_64K_PAGES
523 range 5 64 if PPC32 && PPC_256K_PAGES
524 default "5" if PPC32 && PPC_256K_PAGES
525 range 11 64
526 default "11"
527 help
528 The kernel memory allocator divides physically contiguous memory
529 blocks into "zones", where each zone is a power of two number of
530 pages. This option selects the largest power of two that the kernel
531 keeps in the memory allocator. If you need to allocate very large
532 blocks of physically contiguous memory, then you may need to
533 increase this value.
534
535 This config option is actually maximum order plus one. For example,
536 a value of 11 means that the largest free memory block is 2^10 pages.
537
538 The page size is not necessarily 4KB. For example, on 64-bit
539 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
540 this in mind when choosing a value for this option.
541
542config PPC_SUBPAGE_PROT
543 bool "Support setting protections for 4k subpages"
544 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
545 help
546 This option adds support for a system call to allow user programs
547 to set access permissions (read/write, readonly, or no access)
548 on the 4k subpages of each 64k page.
549
550config SCHED_SMT
551 bool "SMT (Hyperthreading) scheduler support"
552 depends on PPC64 && SMP
553 help
554 SMT scheduler support improves the CPU scheduler's decision making
555 when dealing with POWER5 cpus at a cost of slightly increased
556 overhead in some places. If unsure say N here.
557
558config CMDLINE_BOOL
559 bool "Default bootloader kernel arguments"
560
561config CMDLINE
562 string "Initial kernel command string"
563 depends on CMDLINE_BOOL
564 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
565 help
566 On some platforms, there is currently no way for the boot loader to
567 pass arguments to the kernel. For these platforms, you can supply
568 some command-line options at build time by entering them here. In
569 most cases you will need to specify the root device here.
570
571config EXTRA_TARGETS
572 string "Additional default image types"
573 help
574 List additional targets to be built by the bootwrapper here (separated
575 by spaces). This is useful for targets that depend of device tree
576 files in the .dts directory.
577
578 Targets in this list will be build as part of the default build
579 target, or when the user does a 'make zImage' or a
580 'make zImage.initrd'.
581
582 If unsure, leave blank
583
584config ARCH_WANTS_FREEZER_CONTROL
585 def_bool y
586 depends on ADB_PMU
587
588source kernel/power/Kconfig
589
590config SECCOMP
591 bool "Enable seccomp to safely compute untrusted bytecode"
592 depends on PROC_FS
593 default y
594 help
595 This kernel feature is useful for number crunching applications
596 that may need to compute untrusted bytecode during their
597 execution. By using pipes or other transports made available to
598 the process as file descriptors supporting the read/write
599 syscalls, it's possible to isolate those applications in
600 their own address space using seccomp. Once seccomp is
601 enabled via /proc/<pid>/seccomp, it cannot be disabled
602 and the task is only allowed to execute a few safe syscalls
603 defined by each seccomp mode.
604
605 If unsure, say Y. Only embedded should say N here.
606
607endmenu
608
609config ISA_DMA_API
610 bool
611 default PCI
612
613menu "Bus options"
614
615config ISA
616 bool "Support for ISA-bus hardware"
617 depends on PPC_PREP || PPC_CHRP
618 select PPC_I8259
619 help
620 Find out whether you have ISA slots on your motherboard. ISA is the
621 name of a bus system, i.e. the way the CPU talks to the other stuff
622 inside your box. If you have an Apple machine, say N here; if you
623 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
624 you have an embedded board, consult your board documentation.
625
626config ZONE_DMA
627 bool
628 default y
629
630config NEED_DMA_MAP_STATE
631 def_bool (PPC64 || NOT_COHERENT_CACHE)
632
633config NEED_SG_DMA_LENGTH
634 def_bool y
635
636config GENERIC_ISA_DMA
637 bool
638 depends on ISA_DMA_API
639 default y
640
641config PPC_INDIRECT_PCI
642 bool
643 depends on PCI
644 default y if 40x || 44x
645 default n
646
647config EISA
648 bool
649
650config SBUS
651 bool
652
653config FSL_SOC
654 bool
655 select HAVE_CAN_FLEXCAN if NET && CAN
656 select PPC_CLOCK if CAN_FLEXCAN
657
658config FSL_PCI
659 bool
660 select PPC_INDIRECT_PCI
661 select PCI_QUIRKS
662
663config FSL_PMC
664 bool
665 default y
666 depends on SUSPEND && (PPC_85xx || PPC_86xx)
667 help
668 Freescale MPC85xx/MPC86xx power management controller support
669 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
670
671config PPC4xx_CPM
672 bool
673 default y
674 depends on SUSPEND && (44x || 40x)
675 help
676 PPC4xx Clock Power Management (CPM) support (suspend/resume).
677 It also enables support for two different idle states (idle-wait
678 and idle-doze).
679
680config 4xx_SOC
681 bool
682
683config FSL_LBC
684 bool "Freescale Local Bus support"
685 depends on FSL_SOC
686 help
687 Enables reporting of errors from the Freescale local bus
688 controller. Also contains some common code used by
689 drivers for specific local bus peripherals.
690
691config FSL_IFC
692 bool
693 depends on FSL_SOC
694
695config FSL_GTM
696 bool
697 depends on PPC_83xx || QUICC_ENGINE || CPM2
698 help
699 Freescale General-purpose Timers support
700
701# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
702config MCA
703 bool
704
705# Platforms that what PCI turned unconditionally just do select PCI
706# in their config node. Platforms that want to choose at config
707# time should select PPC_PCI_CHOICE
708config PPC_PCI_CHOICE
709 bool
710
711config PCI
712 bool "PCI support" if PPC_PCI_CHOICE
713 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
714 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
715 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
716 default PCI_QSPAN if !4xx && !CPM2 && 8xx
717 select ARCH_SUPPORTS_MSI
718 select GENERIC_PCI_IOMAP
719 help
720 Find out whether your system includes a PCI bus. PCI is the name of
721 a bus system, i.e. the way the CPU talks to the other stuff inside
722 your box. If you say Y here, the kernel will include drivers and
723 infrastructure code to support PCI bus devices.
724
725config PCI_DOMAINS
726 def_bool PCI
727
728config PCI_SYSCALL
729 def_bool PCI
730
731config PCI_QSPAN
732 bool "QSpan PCI"
733 depends on !4xx && !CPM2 && 8xx
734 select PPC_I8259
735 help
736 Say Y here if you have a system based on a Motorola 8xx-series
737 embedded processor with a QSPAN PCI interface, otherwise say N.
738
739config PCI_8260
740 bool
741 depends on PCI && 8260
742 select PPC_INDIRECT_PCI
743 default y
744
745config 8260_PCI9
746 bool "Enable workaround for MPC826x erratum PCI 9"
747 depends on PCI_8260 && !8272
748 default y
749
750source "drivers/pci/pcie/Kconfig"
751
752source "drivers/pci/Kconfig"
753
754source "drivers/pcmcia/Kconfig"
755
756source "drivers/pci/hotplug/Kconfig"
757
758config HAS_RAPIDIO
759 bool
760 default n
761
762config RAPIDIO
763 bool "RapidIO support"
764 depends on HAS_RAPIDIO || PCI
765 help
766 If you say Y here, the kernel will include drivers and
767 infrastructure code to support RapidIO interconnect devices.
768
769config FSL_RIO
770 bool "Freescale Embedded SRIO Controller support"
771 depends on RAPIDIO && HAS_RAPIDIO
772 default "n"
773 ---help---
774 Include support for RapidIO controller on Freescale embedded
775 processors (MPC8548, MPC8641, etc).
776
777source "drivers/rapidio/Kconfig"
778
779endmenu
780
781config NONSTATIC_KERNEL
782 bool
783 default n
784
785menu "Advanced setup"
786 depends on PPC32
787
788config ADVANCED_OPTIONS
789 bool "Prompt for advanced kernel configuration options"
790 help
791 This option will enable prompting for a variety of advanced kernel
792 configuration options. These options can cause the kernel to not
793 work if they are set incorrectly, but can be used to optimize certain
794 aspects of kernel memory management.
795
796 Unless you know what you are doing, say N here.
797
798comment "Default settings for advanced configuration options are used"
799 depends on !ADVANCED_OPTIONS
800
801config LOWMEM_SIZE_BOOL
802 bool "Set maximum low memory"
803 depends on ADVANCED_OPTIONS
804 help
805 This option allows you to set the maximum amount of memory which
806 will be used as "low memory", that is, memory which the kernel can
807 access directly, without having to set up a kernel virtual mapping.
808 This can be useful in optimizing the layout of kernel virtual
809 memory.
810
811 Say N here unless you know what you are doing.
812
813config LOWMEM_SIZE
814 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
815 default "0x30000000"
816
817config LOWMEM_CAM_NUM_BOOL
818 bool "Set number of CAMs to use to map low memory"
819 depends on ADVANCED_OPTIONS && FSL_BOOKE
820 help
821 This option allows you to set the maximum number of CAM slots that
822 will be used to map low memory. There are a limited number of slots
823 available and even more limited number that will fit in the L1 MMU.
824 However, using more entries will allow mapping more low memory. This
825 can be useful in optimizing the layout of kernel virtual memory.
826
827 Say N here unless you know what you are doing.
828
829config LOWMEM_CAM_NUM
830 depends on FSL_BOOKE
831 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
832 default 3
833
834config DYNAMIC_MEMSTART
835 bool "Enable page aligned dynamic load address for kernel (EXPERIMENTAL)"
836 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
837 select NONSTATIC_KERNEL
838 help
839 This option enables the kernel to be loaded at any page aligned
840 physical address. The kernel creates a mapping from KERNELBASE to
841 the address where the kernel is loaded. The page size here implies
842 the TLB page size of the mapping for kernel on the particular platform.
843 Please refer to the init code for finding the TLB page size.
844
845 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
846 kernel image, where the only restriction is the page aligned kernel
847 load address. When this option is enabled, the compile time physical
848 address CONFIG_PHYSICAL_START is ignored.
849
850 This option is overridden by CONFIG_RELOCATABLE
851
852config RELOCATABLE
853 bool "Build a relocatable kernel (EXPERIMENTAL)"
854 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && 44x
855 select NONSTATIC_KERNEL
856 help
857 This builds a kernel image that is capable of running at the
858 location the kernel is loaded at, without any alignment restrictions.
859 This feature is a superset of DYNAMIC_MEMSTART and hence overrides it.
860
861 One use is for the kexec on panic case where the recovery kernel
862 must live at a different physical address than the primary
863 kernel.
864
865 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
866 it has been loaded at and the compile time physical addresses
867 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
868 setting can still be useful to bootwrappers that need to know the
869 load address of the kernel (eg. u-boot/mkimage).
870
871config RELOCATABLE_PPC32
872 def_bool y
873 depends on PPC32 && RELOCATABLE
874
875config PAGE_OFFSET_BOOL
876 bool "Set custom page offset address"
877 depends on ADVANCED_OPTIONS
878 help
879 This option allows you to set the kernel virtual address at which
880 the kernel will map low memory. This can be useful in optimizing
881 the virtual memory layout of the system.
882
883 Say N here unless you know what you are doing.
884
885config PAGE_OFFSET
886 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
887 default "0xc0000000"
888
889config KERNEL_START_BOOL
890 bool "Set custom kernel base address"
891 depends on ADVANCED_OPTIONS
892 help
893 This option allows you to set the kernel virtual address at which
894 the kernel will be loaded. Normally this should match PAGE_OFFSET
895 however there are times (like kdump) that one might not want them
896 to be the same.
897
898 Say N here unless you know what you are doing.
899
900config KERNEL_START
901 hex "Virtual address of kernel base" if KERNEL_START_BOOL
902 default PAGE_OFFSET if PAGE_OFFSET_BOOL
903 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
904 default "0xc0000000"
905
906config PHYSICAL_START_BOOL
907 bool "Set physical address where the kernel is loaded"
908 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
909 help
910 This gives the physical address where the kernel is loaded.
911
912 Say N here unless you know what you are doing.
913
914config PHYSICAL_START
915 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
916 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
917 default "0x00000000"
918
919config PHYSICAL_ALIGN
920 hex
921 default "0x04000000" if FSL_BOOKE
922 help
923 This value puts the alignment restrictions on physical address
924 where kernel is loaded and run from. Kernel is compiled for an
925 address which meets above alignment restriction.
926
927config TASK_SIZE_BOOL
928 bool "Set custom user task size"
929 depends on ADVANCED_OPTIONS
930 help
931 This option allows you to set the amount of virtual address space
932 allocated to user tasks. This can be useful in optimizing the
933 virtual memory layout of the system.
934
935 Say N here unless you know what you are doing.
936
937config TASK_SIZE
938 hex "Size of user task space" if TASK_SIZE_BOOL
939 default "0x80000000" if PPC_PREP || PPC_8xx
940 default "0xc0000000"
941
942config CONSISTENT_SIZE_BOOL
943 bool "Set custom consistent memory pool size"
944 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
945 help
946 This option allows you to set the size of the
947 consistent memory pool. This pool of virtual memory
948 is used to make consistent memory allocations.
949
950config CONSISTENT_SIZE
951 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
952 default "0x00200000" if NOT_COHERENT_CACHE
953
954config PIN_TLB
955 bool "Pinned Kernel TLBs (860 ONLY)"
956 depends on ADVANCED_OPTIONS && 8xx
957endmenu
958
959if PPC64
960config RELOCATABLE
961 bool "Build a relocatable kernel"
962 select NONSTATIC_KERNEL
963 help
964 This builds a kernel image that is capable of running anywhere
965 in the RMA (real memory area) at any 16k-aligned base address.
966 The kernel is linked as a position-independent executable (PIE)
967 and contains dynamic relocations which are processed early
968 in the bootup process.
969
970 One use is for the kexec on panic case where the recovery kernel
971 must live at a different physical address than the primary
972 kernel.
973
974config PAGE_OFFSET
975 hex
976 default "0xc000000000000000"
977config KERNEL_START
978 hex
979 default "0xc000000000000000"
980config PHYSICAL_START
981 hex
982 default "0x00000000"
983endif
984
985source "net/Kconfig"
986
987source "drivers/Kconfig"
988
989source "fs/Kconfig"
990
991source "arch/powerpc/sysdev/qe_lib/Kconfig"
992
993source "lib/Kconfig"
994
995source "arch/powerpc/Kconfig.debug"
996
997source "security/Kconfig"
998
999config KEYS_COMPAT
1000 bool
1001 depends on COMPAT && KEYS
1002 default y
1003
1004source "crypto/Kconfig"
1005
1006config PPC_CLOCK
1007 bool
1008 default n
1009 select HAVE_CLK
1010
1011config PPC_LIB_RHEAP
1012 bool
1013
1014source "arch/powerpc/kvm/Kconfig"