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TOMOYO Linux Cross Reference
Linux/arch/powerpc/Kconfig

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 # SPDX-License-Identifier: GPL-2.0
  2 source "arch/powerpc/platforms/Kconfig.cputype"
  3 
  4 config CC_HAS_ELFV2
  5         def_bool PPC64 && $(cc-option, -mabi=elfv2)
  6 
  7 config CC_HAS_PREFIXED
  8         def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)
  9 
 10 config 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 
 18 config 32BIT
 19         bool
 20         default y if PPC32
 21 
 22 config 64BIT
 23         bool
 24         default y if PPC64
 25 
 26 config LIVEPATCH_64
 27         def_bool PPC64
 28         depends on LIVEPATCH
 29 
 30 config MMU
 31         bool
 32         default y
 33 
 34 config 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 
 52 config 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 
 60 config 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 
 68 config 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 
 76 config 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 
 86 config NMI_IPI
 87         bool
 88         depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
 89         default y
 90 
 91 config 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 
101 config STACKTRACE_SUPPORT
102         bool
103         default y
104 
105 config LOCKDEP_SUPPORT
106         bool
107         default y
108 
109 config GENERIC_LOCKBREAK
110         bool
111         default y
112         depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS
113 
114 config GENERIC_HWEIGHT
115         bool
116         default y
117 
118 config 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_DMA_OPS                 if PPC64
137         select ARCH_HAS_FORTIFY_SOURCE
138         select ARCH_HAS_GCOV_PROFILE_ALL
139         select ARCH_HAS_KCOV
140         select ARCH_HAS_KERNEL_FPU_SUPPORT      if PPC64 && PPC_FPU
141         select ARCH_HAS_MEMBARRIER_CALLBACKS
142         select ARCH_HAS_MEMBARRIER_SYNC_CORE
143         select ARCH_HAS_MEMREMAP_COMPAT_ALIGN   if PPC_64S_HASH_MMU
144         select ARCH_HAS_MMIOWB                  if PPC64
145         select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
146         select ARCH_HAS_PHYS_TO_DMA
147         select ARCH_HAS_PMEM_API
148         select ARCH_HAS_PTE_DEVMAP              if PPC_BOOK3S_64
149         select ARCH_HAS_PTE_SPECIAL
150         select ARCH_HAS_SCALED_CPUTIME          if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
151         select ARCH_HAS_SET_MEMORY
152         select ARCH_HAS_STRICT_KERNEL_RWX       if (PPC_BOOK3S || PPC_8xx) && !HIBERNATION
153         select ARCH_HAS_STRICT_KERNEL_RWX       if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE
154         select ARCH_HAS_STRICT_MODULE_RWX       if ARCH_HAS_STRICT_KERNEL_RWX
155         select ARCH_HAS_SYSCALL_WRAPPER         if !SPU_BASE && !COMPAT
156         select ARCH_HAS_TICK_BROADCAST          if GENERIC_CLOCKEVENTS_BROADCAST
157         select ARCH_HAS_UACCESS_FLUSHCACHE
158         select ARCH_HAS_UBSAN
159         select ARCH_HAVE_NMI_SAFE_CMPXCHG
160         select ARCH_HAVE_EXTRA_ELF_NOTES        if SPU_BASE
161         select ARCH_KEEP_MEMBLOCK
162         select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if PPC_RADIX_MMU
163         select ARCH_MIGHT_HAVE_PC_PARPORT
164         select ARCH_MIGHT_HAVE_PC_SERIO
165         select ARCH_OPTIONAL_KERNEL_RWX         if ARCH_HAS_STRICT_KERNEL_RWX
166         select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
167         select ARCH_SPLIT_ARG64                 if PPC32
168         select ARCH_STACKWALK
169         select ARCH_SUPPORTS_ATOMIC_RMW
170         select ARCH_SUPPORTS_DEBUG_PAGEALLOC    if PPC_BOOK3S || PPC_8xx
171         select ARCH_USE_BUILTIN_BSWAP
172         select ARCH_USE_CMPXCHG_LOCKREF         if PPC64
173         select ARCH_USE_MEMTEST
174         select ARCH_USE_QUEUED_RWLOCKS          if PPC_QUEUED_SPINLOCKS
175         select ARCH_WANT_DEFAULT_BPF_JIT
176         select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
177         select ARCH_WANT_IPC_PARSE_VERSION
178         select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
179         select ARCH_WANT_LD_ORPHAN_WARN
180         select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP   if PPC_RADIX_MMU
181         select ARCH_WANTS_MODULES_DATA_IN_VMALLOC       if PPC_BOOK3S_32 || PPC_8xx
182         select ARCH_WEAK_RELEASE_ACQUIRE
183         select BINFMT_ELF
184         select BUILDTIME_TABLE_SORT
185         select CLONE_BACKWARDS
186         select CPUMASK_OFFSTACK                 if NR_CPUS >= 8192
187         select DCACHE_WORD_ACCESS               if PPC64 && CPU_LITTLE_ENDIAN
188         select DMA_OPS_BYPASS                   if PPC64
189         select DYNAMIC_FTRACE                   if FUNCTION_TRACER
190         select EDAC_ATOMIC_SCRUB
191         select EDAC_SUPPORT
192         select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if ARCH_USING_PATCHABLE_FUNCTION_ENTRY
193         select FUNCTION_ALIGNMENT_4B
194         select GENERIC_ATOMIC64                 if PPC32
195         select GENERIC_CLOCKEVENTS_BROADCAST    if SMP
196         select GENERIC_CMOS_UPDATE
197         select GENERIC_CPU_AUTOPROBE
198         select GENERIC_CPU_VULNERABILITIES      if PPC_BARRIER_NOSPEC
199         select GENERIC_EARLY_IOREMAP
200         select GENERIC_GETTIMEOFDAY
201         select GENERIC_IDLE_POLL_SETUP
202         select GENERIC_IOREMAP
203         select GENERIC_IRQ_SHOW
204         select GENERIC_IRQ_SHOW_LEVEL
205         select GENERIC_PCI_IOMAP                if PCI
206         select GENERIC_PTDUMP
207         select GENERIC_SMP_IDLE_THREAD
208         select GENERIC_TIME_VSYSCALL
209         select GENERIC_VDSO_TIME_NS
210         select HAS_IOPORT                       if PCI
211         select HAVE_ARCH_AUDITSYSCALL
212         select HAVE_ARCH_HUGE_VMALLOC           if HAVE_ARCH_HUGE_VMAP
213         select HAVE_ARCH_HUGE_VMAP              if PPC_RADIX_MMU || PPC_8xx
214         select HAVE_ARCH_JUMP_LABEL
215         select HAVE_ARCH_JUMP_LABEL_RELATIVE
216         select HAVE_ARCH_KASAN                  if PPC32 && PAGE_SHIFT <= 14
217         select HAVE_ARCH_KASAN                  if PPC_RADIX_MMU
218         select HAVE_ARCH_KASAN                  if PPC_BOOK3E_64
219         select HAVE_ARCH_KASAN_VMALLOC          if HAVE_ARCH_KASAN
220         select HAVE_ARCH_KCSAN
221         select HAVE_ARCH_KFENCE                 if ARCH_SUPPORTS_DEBUG_PAGEALLOC
222         select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
223         select HAVE_ARCH_WITHIN_STACK_FRAMES
224         select HAVE_ARCH_KGDB
225         select HAVE_ARCH_MMAP_RND_BITS
226         select HAVE_ARCH_MMAP_RND_COMPAT_BITS   if COMPAT
227         select HAVE_ARCH_NVRAM_OPS
228         select HAVE_ARCH_SECCOMP_FILTER
229         select HAVE_ARCH_TRACEHOOK
230         select HAVE_ASM_MODVERSIONS
231         select HAVE_CONTEXT_TRACKING_USER
232         select HAVE_C_RECORDMCOUNT
233         select HAVE_DEBUG_KMEMLEAK
234         select HAVE_DEBUG_STACKOVERFLOW
235         select HAVE_DYNAMIC_FTRACE
236         select HAVE_DYNAMIC_FTRACE_WITH_ARGS    if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
237         select HAVE_DYNAMIC_FTRACE_WITH_REGS    if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
238         select HAVE_EBPF_JIT
239         select HAVE_EFFICIENT_UNALIGNED_ACCESS
240         select HAVE_GUP_FAST
241         select HAVE_FTRACE_MCOUNT_RECORD
242         select HAVE_FUNCTION_ARG_ACCESS_API
243         select HAVE_FUNCTION_DESCRIPTORS        if PPC64_ELF_ABI_V1
244         select HAVE_FUNCTION_ERROR_INJECTION
245         select HAVE_FUNCTION_GRAPH_TRACER
246         select HAVE_FUNCTION_TRACER             if PPC64 || (PPC32 && CC_IS_GCC)
247         select HAVE_GCC_PLUGINS                 if GCC_VERSION >= 50200   # plugin support on gcc <= 5.1 is buggy on PPC
248         select HAVE_GENERIC_VDSO
249         select HAVE_HARDLOCKUP_DETECTOR_ARCH    if PPC_BOOK3S_64 && SMP
250         select HAVE_HARDLOCKUP_DETECTOR_PERF    if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
251         select HAVE_HW_BREAKPOINT               if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
252         select HAVE_IOREMAP_PROT
253         select HAVE_IRQ_TIME_ACCOUNTING
254         select HAVE_KERNEL_GZIP
255         select HAVE_KERNEL_LZMA                 if DEFAULT_UIMAGE
256         select HAVE_KERNEL_LZO                  if DEFAULT_UIMAGE
257         select HAVE_KERNEL_XZ                   if PPC_BOOK3S || 44x
258         select HAVE_KPROBES
259         select HAVE_KPROBES_ON_FTRACE
260         select HAVE_KRETPROBES
261         select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT && (!ARCH_USING_PATCHABLE_FUNCTION_ENTRY || (!CC_IS_GCC || GCC_VERSION >= 110100))
262         select HAVE_LIVEPATCH                   if HAVE_DYNAMIC_FTRACE_WITH_REGS
263         select HAVE_MOD_ARCH_SPECIFIC
264         select HAVE_NMI                         if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
265         select HAVE_OPTPROBES
266         select HAVE_OBJTOOL                     if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
267         select HAVE_OBJTOOL_MCOUNT              if HAVE_OBJTOOL
268         select HAVE_PERF_EVENTS
269         select HAVE_PERF_EVENTS_NMI             if PPC64
270         select HAVE_PERF_REGS
271         select HAVE_PERF_USER_STACK_DUMP
272         select HAVE_RETHOOK                     if KPROBES
273         select HAVE_REGS_AND_STACK_ACCESS_API
274         select HAVE_RELIABLE_STACKTRACE
275         select HAVE_RSEQ
276         select HAVE_SETUP_PER_CPU_AREA          if PPC64
277         select HAVE_SOFTIRQ_ON_OWN_STACK
278         select HAVE_STACKPROTECTOR              if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
279         select HAVE_STACKPROTECTOR              if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
280         select HAVE_STATIC_CALL                 if PPC32
281         select HAVE_SYSCALL_TRACEPOINTS
282         select HAVE_VIRT_CPU_ACCOUNTING
283         select HAVE_VIRT_CPU_ACCOUNTING_GEN
284         select HOTPLUG_SMT                      if HOTPLUG_CPU
285         select SMT_NUM_THREADS_DYNAMIC
286         select HUGETLB_PAGE_SIZE_VARIABLE       if PPC_BOOK3S_64 && HUGETLB_PAGE
287         select IOMMU_HELPER                     if PPC64
288         select IRQ_DOMAIN
289         select IRQ_FORCED_THREADING
290         select KASAN_VMALLOC                    if KASAN && EXECMEM
291         select LOCK_MM_AND_FIND_VMA
292         select MMU_GATHER_PAGE_SIZE
293         select MMU_GATHER_RCU_TABLE_FREE
294         select MMU_GATHER_MERGE_VMAS
295         select MMU_LAZY_TLB_SHOOTDOWN           if PPC_BOOK3S_64
296         select MODULES_USE_ELF_RELA
297         select NEED_DMA_MAP_STATE               if PPC64 || NOT_COHERENT_CACHE
298         select NEED_PER_CPU_EMBED_FIRST_CHUNK   if PPC64
299         select NEED_PER_CPU_PAGE_FIRST_CHUNK    if PPC64
300         select NEED_SG_DMA_LENGTH
301         select OF
302         select OF_EARLY_FLATTREE
303         select OLD_SIGACTION                    if PPC32
304         select OLD_SIGSUSPEND
305         select PCI_DOMAINS                      if PCI
306         select PCI_MSI_ARCH_FALLBACKS           if PCI_MSI
307         select PCI_SYSCALL                      if PCI
308         select PPC_DAWR                         if PPC64
309         select RTC_LIB
310         select SPARSE_IRQ
311         select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
312         select SYSCTL_EXCEPTION_TRACE
313         select THREAD_INFO_IN_TASK
314         select TRACE_IRQFLAGS_SUPPORT
315         select VDSO_GETRANDOM
316         #
317         # Please keep this list sorted alphabetically.
318         #
319 
320 config PPC_BARRIER_NOSPEC
321         bool
322         default y
323         depends on PPC_BOOK3S_64 || PPC_E500
324 
325 config PPC_HAS_LBARX_LHARX
326         bool
327 
328 config EARLY_PRINTK
329         bool
330         default y
331 
332 config PANIC_TIMEOUT
333         int
334         default 180
335 
336 config COMPAT
337         bool "Enable support for 32bit binaries"
338         depends on PPC64
339         default y if !CPU_LITTLE_ENDIAN
340         select ARCH_WANT_OLD_COMPAT_IPC
341         select COMPAT_OLD_SIGACTION
342 
343 config SCHED_OMIT_FRAME_POINTER
344         bool
345         default y
346 
347 config ARCH_MAY_HAVE_PC_FDC
348         bool
349         default PCI
350 
351 config PPC_UDBG_16550
352         bool
353 
354 config GENERIC_TBSYNC
355         bool
356         default y if PPC32 && SMP
357 
358 config AUDIT_ARCH
359         bool
360         default y
361 
362 config GENERIC_BUG
363         bool
364         default y
365         depends on BUG
366 
367 config GENERIC_BUG_RELATIVE_POINTERS
368         def_bool y
369         depends on GENERIC_BUG
370 
371 config SYS_SUPPORTS_APM_EMULATION
372         default y if PMAC_APM_EMU
373         bool
374 
375 config EPAPR_BOOT
376         bool
377         help
378           Used to allow a board to specify it wants an ePAPR compliant wrapper.
379 
380 config DEFAULT_UIMAGE
381         bool
382         help
383           Used to allow a board to specify it wants a uImage built by default
384 
385 config ARCH_HIBERNATION_POSSIBLE
386         bool
387         default y
388 
389 config ARCH_SUSPEND_POSSIBLE
390         def_bool y
391         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
392                    (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
393                    || 44x
394 
395 config ARCH_SUSPEND_NONZERO_CPU
396         def_bool y
397         depends on PPC_POWERNV || PPC_PSERIES
398 
399 config ARCH_HAS_ADD_PAGES
400         def_bool y
401         depends on ARCH_ENABLE_MEMORY_HOTPLUG
402 
403 config PPC_DCR_NATIVE
404         bool
405 
406 config PPC_DCR_MMIO
407         bool
408 
409 config PPC_DCR
410         bool
411         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
412         default y
413 
414 config PPC_PCI_OF_BUS_MAP
415         bool "Use pci_to_OF_bus_map (deprecated)"
416         depends on PPC32
417         depends on PPC_PMAC || PPC_CHRP
418         help
419           This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which
420           restricts the system to only having 256 PCI buses. On CHRP it also causes
421           the "pci-OF-bus-map" property to be created in the device tree.
422 
423           If unsure, say "N".
424 
425 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
426         depends on PPC32
427         depends on !PPC_PCI_OF_BUS_MAP
428         bool "Assign PCI bus numbers from zero individually for each PCI domain"
429         default y
430         help
431           By default on PPC32 were PCI bus numbers unique across all PCI domains.
432           So system could have only 256 PCI buses independently of available
433           PCI domains. When this option is enabled then PCI bus numbers are
434           PCI domain dependent and each PCI controller on own domain can have
435           256 PCI buses, like it is on other Linux architectures.
436 
437 config PPC_OF_PLATFORM_PCI
438         bool
439         depends on PCI
440         depends on PPC64 # not supported on 32 bits yet
441 
442 config ARCH_SUPPORTS_UPROBES
443         def_bool y
444 
445 config PPC_ADV_DEBUG_REGS
446         bool
447         depends on BOOKE
448         default y
449 
450 config PPC_ADV_DEBUG_IACS
451         int
452         depends on PPC_ADV_DEBUG_REGS
453         default 4 if 44x
454         default 2
455 
456 config PPC_ADV_DEBUG_DACS
457         int
458         depends on PPC_ADV_DEBUG_REGS
459         default 2
460 
461 config PPC_ADV_DEBUG_DVCS
462         int
463         depends on PPC_ADV_DEBUG_REGS
464         default 2 if 44x
465         default 0
466 
467 config PPC_ADV_DEBUG_DAC_RANGE
468         bool
469         depends on PPC_ADV_DEBUG_REGS && 44x
470         default y
471 
472 config PPC_DAWR
473         bool
474 
475 config PGTABLE_LEVELS
476         int
477         default 2 if !PPC64
478         default 4
479 
480 source "arch/powerpc/sysdev/Kconfig"
481 source "arch/powerpc/platforms/Kconfig"
482 
483 menu "Kernel options"
484 
485 config HIGHMEM
486         bool "High memory support"
487         depends on PPC32
488         select KMAP_LOCAL
489 
490 source "kernel/Kconfig.hz"
491 
492 config MATH_EMULATION
493         bool "Math emulation"
494         depends on 44x || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
495         select PPC_FPU_REGS
496         help
497           Some PowerPC chips designed for embedded applications do not have
498           a floating-point unit and therefore do not implement the
499           floating-point instructions in the PowerPC instruction set.  If you
500           say Y here, the kernel will include code to emulate a floating-point
501           unit, which will allow programs that use floating-point
502           instructions to run.
503 
504           This is also useful to emulate missing (optional) instructions
505           such as fsqrt on cores that do have an FPU but do not implement
506           them (such as Freescale BookE).
507 
508 choice
509         prompt "Math emulation options"
510         default MATH_EMULATION_FULL
511         depends on MATH_EMULATION
512 
513 config MATH_EMULATION_FULL
514         bool "Emulate all the floating point instructions"
515         help
516           Select this option will enable the kernel to support to emulate
517           all the floating point instructions. If your SoC doesn't have
518           a FPU, you should select this.
519 
520 config MATH_EMULATION_HW_UNIMPLEMENTED
521         bool "Just emulate the FPU unimplemented instructions"
522         help
523           Select this if you know there does have a hardware FPU on your
524           SoC, but some floating point instructions are not implemented by that.
525 
526 endchoice
527 
528 config PPC_TRANSACTIONAL_MEM
529         bool "Transactional Memory support for POWERPC"
530         depends on PPC_BOOK3S_64
531         depends on SMP
532         select ALTIVEC
533         select VSX
534         help
535           Support user-mode Transactional Memory on POWERPC.
536 
537 config PPC_UV
538         bool "Ultravisor support"
539         depends on KVM_BOOK3S_HV_POSSIBLE
540         depends on DEVICE_PRIVATE
541         default n
542         help
543           This option paravirtualizes the kernel to run in POWER platforms that
544           supports the Protected Execution Facility (PEF). On such platforms,
545           the ultravisor firmware runs at a privilege level above the
546           hypervisor.
547 
548           If unsure, say "N".
549 
550 config LD_HEAD_STUB_CATCH
551         bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
552         depends on PPC64
553         help
554           Very large kernels can cause linker branch stubs to be generated by
555           code in head_64.S, which moves the head text sections out of their
556           specified location. This option can work around the problem.
557 
558           If unsure, say "N".
559 
560 config MPROFILE_KERNEL
561         depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER
562         def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN
563         def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN
564 
565 config ARCH_USING_PATCHABLE_FUNCTION_ENTRY
566         depends on FUNCTION_TRACER && (PPC32 || PPC64_ELF_ABI_V2)
567         depends on $(cc-option,-fpatchable-function-entry=2)
568         def_bool y if PPC32
569         def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN
570         def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN
571 
572 config HOTPLUG_CPU
573         bool "Support for enabling/disabling CPUs"
574         depends on SMP && (PPC_PSERIES || \
575                 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
576         help
577           Say Y here to be able to disable and re-enable individual
578           CPUs at runtime on SMP machines.
579 
580           Say N if you are unsure.
581 
582 config INTERRUPT_SANITIZE_REGISTERS
583         bool "Clear gprs on interrupt arrival"
584         depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
585         default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
586         help
587           Reduce the influence of user register state on interrupt handlers and
588           syscalls through clearing user state from registers before handling
589           the exception.
590 
591 config PPC_QUEUED_SPINLOCKS
592         bool "Queued spinlocks" if EXPERT
593         depends on SMP
594         default PPC_BOOK3S_64
595         help
596           Say Y here to use queued spinlocks which give better scalability and
597           fairness on large SMP and NUMA systems without harming single threaded
598           performance.
599 
600 config ARCH_CPU_PROBE_RELEASE
601         def_bool y
602         depends on HOTPLUG_CPU
603 
604 config PPC64_SUPPORTS_MEMORY_FAILURE
605         bool "Add support for memory hwpoison"
606         depends on PPC_BOOK3S_64
607         default "y" if PPC_POWERNV
608         select ARCH_SUPPORTS_MEMORY_FAILURE
609 
610 config ARCH_SUPPORTS_KEXEC
611         def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP)
612 
613 config ARCH_SUPPORTS_KEXEC_FILE
614         def_bool PPC64
615 
616 config ARCH_SUPPORTS_KEXEC_PURGATORY
617         def_bool y
618 
619 config ARCH_SELECTS_KEXEC_FILE
620         def_bool y
621         depends on KEXEC_FILE
622         select KEXEC_ELF
623         select HAVE_IMA_KEXEC if IMA
624 
625 config PPC64_BIG_ENDIAN_ELF_ABI_V2
626         # Option is available to BFD, but LLD does not support ELFv1 so this is
627         # always true there.
628         prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT
629         def_bool y
630         depends on PPC64 && CPU_BIG_ENDIAN
631         depends on CC_HAS_ELFV2
632         help
633           This builds the kernel image using the "Power Architecture 64-Bit ELF
634           V2 ABI Specification", which has a reduced stack overhead and faster
635           function calls. This internal kernel ABI option does not affect
636           userspace compatibility.
637 
638           The V2 ABI is standard for 64-bit little-endian, but for big-endian
639           it is less well tested by kernel and toolchain. However some distros
640           build userspace this way, and it can produce a functioning kernel.
641 
642 config RELOCATABLE
643         bool "Build a relocatable kernel"
644         depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
645         select NONSTATIC_KERNEL
646         help
647           This builds a kernel image that is capable of running at the
648           location the kernel is loaded at. For ppc32, there is no any
649           alignment restrictions, and this feature is a superset of
650           DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
651           16k-aligned base address. The kernel is linked as a
652           position-independent executable (PIE) and contains dynamic relocations
653           which are processed early in the bootup process.
654 
655           One use is for the kexec on panic case where the recovery kernel
656           must live at a different physical address than the primary
657           kernel.
658 
659           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
660           it has been loaded at and the compile time physical addresses
661           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
662           setting can still be useful to bootwrappers that need to know the
663           load address of the kernel (eg. u-boot/mkimage).
664 
665 config RANDOMIZE_BASE
666         bool "Randomize the address of the kernel image"
667         depends on PPC_85xx && FLATMEM
668         depends on RELOCATABLE
669         help
670           Randomizes the virtual address at which the kernel image is
671           loaded, as a security feature that deters exploit attempts
672           relying on knowledge of the location of kernel internals.
673 
674           If unsure, say Y.
675 
676 config RELOCATABLE_TEST
677         bool "Test relocatable kernel"
678         depends on (PPC64 && RELOCATABLE)
679         help
680           This runs the relocatable kernel at the address it was initially
681           loaded at, which tends to be non-zero and therefore test the
682           relocation code.
683 
684 config ARCH_SUPPORTS_CRASH_DUMP
685         def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
686 
687 config ARCH_SELECTS_CRASH_DUMP
688         def_bool y
689         depends on CRASH_DUMP
690         select RELOCATABLE if PPC64 || 44x || PPC_85xx
691 
692 config ARCH_SUPPORTS_CRASH_HOTPLUG
693         def_bool y
694         depends on PPC64
695 
696 config FA_DUMP
697         bool "Firmware-assisted dump"
698         depends on CRASH_DUMP && PPC64 && (PPC_RTAS || PPC_POWERNV)
699         help
700           A robust mechanism to get reliable kernel crash dump with
701           assistance from firmware. This approach does not use kexec,
702           instead firmware assists in booting the capture kernel
703           while preserving memory contents. Firmware-assisted dump
704           is meant to be a kdump replacement offering robustness and
705           speed not possible without system firmware assistance.
706 
707           If unsure, say "y". Only special kernels like petitboot may
708           need to say "N" here.
709 
710 config PRESERVE_FA_DUMP
711         bool "Preserve Firmware-assisted dump"
712         depends on PPC64 && PPC_POWERNV && !FA_DUMP
713         help
714           On a kernel with FA_DUMP disabled, this option helps to preserve
715           crash data from a previously crash'ed kernel. Useful when the next
716           memory preserving kernel boot would process this crash data.
717           Petitboot kernel is the typical usecase for this option.
718 
719 config OPAL_CORE
720         bool "Export OPAL memory as /sys/firmware/opal/core"
721         depends on PPC64 && PPC_POWERNV
722         help
723           This option uses the MPIPL support in firmware to provide an
724           ELF core of OPAL memory after a crash. The ELF core is exported
725           as /sys/firmware/opal/core file which is helpful in debugging
726           OPAL crashes using GDB.
727 
728 config IRQ_ALL_CPUS
729         bool "Distribute interrupts on all CPUs by default"
730         depends on SMP
731         help
732           This option gives the kernel permission to distribute IRQs across
733           multiple CPUs.  Saying N here will route all IRQs to the first
734           CPU.  Generally saying Y is safe, although some problems have been
735           reported with SMP Power Macintoshes with this option enabled.
736 
737 config NUMA
738         bool "NUMA Memory Allocation and Scheduler Support"
739         depends on PPC64 && SMP
740         default y if PPC_PSERIES || PPC_POWERNV
741         select USE_PERCPU_NUMA_NODE_ID
742         help
743           Enable NUMA (Non-Uniform Memory Access) support.
744 
745           The kernel will try to allocate memory used by a CPU on the
746           local memory controller of the CPU and add some more
747           NUMA awareness to the kernel.
748 
749 config NODES_SHIFT
750         int
751         default "8" if PPC64
752         default "4"
753         depends on NUMA
754 
755 config HAVE_MEMORYLESS_NODES
756         def_bool y
757         depends on NUMA
758 
759 config ARCH_SELECT_MEMORY_MODEL
760         def_bool y
761         depends on PPC64
762 
763 config ARCH_FLATMEM_ENABLE
764         def_bool y
765         depends on (PPC64 && !NUMA) || PPC32
766 
767 config ARCH_SPARSEMEM_ENABLE
768         def_bool y
769         depends on PPC64
770         select SPARSEMEM_VMEMMAP_ENABLE
771 
772 config ARCH_SPARSEMEM_DEFAULT
773         def_bool y
774         depends on PPC_BOOK3S_64
775 
776 config ILLEGAL_POINTER_VALUE
777         hex
778         # This is roughly half way between the top of user space and the bottom
779         # of kernel space, which seems about as good as we can get.
780         default 0x5deadbeef0000000 if PPC64
781         default 0
782 
783 config ARCH_MEMORY_PROBE
784         def_bool y
785         depends on MEMORY_HOTPLUG
786 
787 choice
788         prompt "Page size"
789         default PPC_64K_PAGES if PPC_BOOK3S_64
790         default PPC_4K_PAGES
791         help
792           Select the kernel logical page size. Increasing the page size
793           will reduce software overhead at each page boundary, allow
794           hardware prefetch mechanisms to be more effective, and allow
795           larger dma transfers increasing IO efficiency and reducing
796           overhead. However the utilization of memory will increase.
797           For example, each cached file will using a multiple of the
798           page size to hold its contents and the difference between the
799           end of file and the end of page is wasted.
800 
801           Some dedicated systems, such as software raid serving with
802           accelerated calculations, have shown significant increases.
803 
804           If you configure a 64 bit kernel for 64k pages but the
805           processor does not support them, then the kernel will simulate
806           them with 4k pages, loading them on demand, but with the
807           reduced software overhead and larger internal fragmentation.
808           For the 32 bit kernel, a large page option will not be offered
809           unless it is supported by the configured processor.
810 
811           If unsure, choose 4K_PAGES.
812 
813 config PPC_4K_PAGES
814         bool "4k page size"
815         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
816         select HAVE_PAGE_SIZE_4KB
817 
818 config PPC_16K_PAGES
819         bool "16k page size"
820         depends on 44x || PPC_8xx
821         select HAVE_PAGE_SIZE_16KB
822 
823 config PPC_64K_PAGES
824         bool "64k page size"
825         depends on 44x || PPC_BOOK3S_64
826         select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
827         select HAVE_PAGE_SIZE_64KB
828 
829 config PPC_256K_PAGES
830         bool "256k page size (Requires non-standard binutils settings)"
831         depends on 44x && !PPC_47x
832         select HAVE_PAGE_SIZE_256KB
833         help
834           Make the page size 256k.
835 
836           The kernel will only be able to run applications that have been
837           compiled with '-zmax-page-size' set to 256K (the default is 64K) using
838           binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
839           definition from 0x10000 to 0x40000 in older versions.
840 
841 endchoice
842 
843 config THREAD_SHIFT
844         int "Thread shift" if EXPERT
845         range 13 15
846         default "15" if PPC_256K_PAGES
847         default "15" if PPC_PSERIES || PPC_POWERNV
848         default "14" if PPC64
849         default "13"
850         help
851           Used to define the stack size. The default is almost always what you
852           want. Only change this if you know what you are doing.
853 
854 config DATA_SHIFT_BOOL
855         bool "Set custom data alignment"
856         depends on ADVANCED_OPTIONS
857         depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
858         depends on (PPC_8xx && !PIN_TLB_DATA && (!STRICT_KERNEL_RWX || !PIN_TLB_TEXT)) || \
859                    PPC_BOOK3S_32 || PPC_85xx
860         help
861           This option allows you to set the kernel data alignment. When
862           RAM is mapped by blocks, the alignment needs to fit the size and
863           number of possible blocks. The default should be OK for most configs.
864 
865           Say N here unless you know what you are doing.
866 
867 config DATA_SHIFT
868         int "Data shift" if DATA_SHIFT_BOOL
869         default 24 if STRICT_KERNEL_RWX && PPC64
870         range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
871         range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
872         range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
873         default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
874         default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
875         default 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && \
876                       (PIN_TLB_DATA || PIN_TLB_TEXT)
877         default 19 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
878         default 24 if STRICT_KERNEL_RWX && PPC_85xx
879         default PAGE_SHIFT
880         help
881           On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
882           Smaller is the alignment, greater is the number of necessary DBATs.
883 
884           On 8xx, large pages (512kb or 8M) are used to map kernel linear
885           memory. Aligning to 8M reduces TLB misses as only 8M pages are used
886           in that case. If PIN_TLB is selected, it must be aligned to 8M as
887           8M pages will be pinned.
888 
889 config ARCH_FORCE_MAX_ORDER
890         int "Order of maximal physically contiguous allocations"
891         range 7 8 if PPC64 && PPC_64K_PAGES
892         default "8" if PPC64 && PPC_64K_PAGES
893         range 12 12 if PPC64 && !PPC_64K_PAGES
894         default "12" if PPC64 && !PPC_64K_PAGES
895         range 8 10 if PPC32 && PPC_16K_PAGES
896         default "8" if PPC32 && PPC_16K_PAGES
897         range 6 10 if PPC32 && PPC_64K_PAGES
898         default "6" if PPC32 && PPC_64K_PAGES
899         range 4 10 if PPC32 && PPC_256K_PAGES
900         default "4" if PPC32 && PPC_256K_PAGES
901         range 10 12
902         default "10"
903         help
904           The kernel page allocator limits the size of maximal physically
905           contiguous allocations. The limit is called MAX_PAGE_ORDER and it
906           defines the maximal power of two of number of pages that can be
907           allocated as a single contiguous block. This option allows
908           overriding the default setting when ability to allocate very
909           large blocks of physically contiguous memory is required.
910 
911           The page size is not necessarily 4KB.  For example, on 64-bit
912           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
913           this in mind when choosing a value for this option.
914 
915           Don't change if unsure.
916 
917 config PPC_SUBPAGE_PROT
918         bool "Support setting protections for 4k subpages (subpage_prot syscall)"
919         default n
920         depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
921         help
922           This option adds support for system call to allow user programs
923           to set access permissions (read/write, readonly, or no access)
924           on the 4k subpages of each 64k page.
925 
926           If unsure, say N here.
927 
928 config PPC_PROT_SAO_LPAR
929         bool "Support PROT_SAO mappings in LPARs"
930         depends on PPC_BOOK3S_64
931         help
932           This option adds support for PROT_SAO mappings from userspace
933           inside LPARs on supported CPUs.
934 
935           This may cause issues when performing guest migration from
936           a CPU that supports SAO to one that does not.
937 
938           If unsure, say N here.
939 
940 config PPC_COPRO_BASE
941         bool
942 
943 config SCHED_SMT
944         bool "SMT (Hyperthreading) scheduler support"
945         depends on PPC64 && SMP
946         help
947           SMT scheduler support improves the CPU scheduler's decision making
948           when dealing with POWER5 cpus at a cost of slightly increased
949           overhead in some places. If unsure say N here.
950 
951 config PPC_DENORMALISATION
952         bool "PowerPC denormalisation exception handling"
953         depends on PPC_BOOK3S_64
954         default "y" if PPC_POWERNV
955         help
956           Add support for handling denormalisation of single precision
957           values.  Useful for bare metal only.  If unsure say Y here.
958 
959 config CMDLINE
960         string "Initial kernel command string"
961         default ""
962         help
963           On some platforms, there is currently no way for the boot loader to
964           pass arguments to the kernel. For these platforms, you can supply
965           some command-line options at build time by entering them here.  In
966           most cases you will need to specify the root device here.
967 
968 choice
969         prompt "Kernel command line type"
970         depends on CMDLINE != ""
971         default CMDLINE_FROM_BOOTLOADER
972 
973 config CMDLINE_FROM_BOOTLOADER
974         bool "Use bootloader kernel arguments if available"
975         help
976           Uses the command-line options passed by the boot loader. If
977           the boot loader doesn't provide any, the default kernel command
978           string provided in CMDLINE will be used.
979 
980 config CMDLINE_EXTEND
981         bool "Extend bootloader kernel arguments"
982         help
983           The command-line arguments provided by the boot loader will be
984           appended to the default kernel command string.
985 
986 config CMDLINE_FORCE
987         bool "Always use the default kernel command string"
988         help
989           Always use the default kernel command string, even if the boot
990           loader passes other arguments to the kernel.
991           This is useful if you cannot or don't want to change the
992           command-line options your boot loader passes to the kernel.
993 
994 endchoice
995 
996 config EXTRA_TARGETS
997         string "Additional default image types"
998         help
999           List additional targets to be built by the bootwrapper here (separated
1000           by spaces).  This is useful for targets that depend of device tree
1001           files in the .dts directory.
1002 
1003           Targets in this list will be build as part of the default build
1004           target, or when the user does a 'make zImage' or a
1005           'make zImage.initrd'.
1006 
1007           If unsure, leave blank
1008 
1009 config ARCH_WANTS_FREEZER_CONTROL
1010         def_bool y
1011         depends on ADB_PMU
1012 
1013 source "kernel/power/Kconfig"
1014 
1015 config PPC_MEM_KEYS
1016         prompt "PowerPC Memory Protection Keys"
1017         def_bool y
1018         depends on PPC_BOOK3S_64
1019         depends on PPC_64S_HASH_MMU
1020         select ARCH_USES_HIGH_VMA_FLAGS
1021         select ARCH_HAS_PKEYS
1022         help
1023           Memory Protection Keys provides a mechanism for enforcing
1024           page-based protections, but without requiring modification of the
1025           page tables when an application changes protection domains.
1026 
1027           For details, see Documentation/core-api/protection-keys.rst
1028 
1029           If unsure, say y.
1030 
1031 config ARCH_PKEY_BITS
1032         int
1033         default 5
1034 
1035 config PPC_SECURE_BOOT
1036         prompt "Enable secure boot support"
1037         bool
1038         depends on PPC_POWERNV || PPC_PSERIES
1039         depends on IMA_ARCH_POLICY
1040         imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1041         select PSERIES_PLPKS if PPC_PSERIES
1042         help
1043           Systems with firmware secure boot enabled need to define security
1044           policies to extend secure boot to the OS. This config allows a user
1045           to enable OS secure boot on systems that have firmware support for
1046           it. If in doubt say N.
1047 
1048 config PPC_SECVAR_SYSFS
1049         bool "Enable sysfs interface for POWER secure variables"
1050         default y
1051         depends on PPC_SECURE_BOOT
1052         depends on SYSFS
1053         help
1054           POWER secure variables are managed and controlled by firmware.
1055           These variables are exposed to userspace via sysfs to enable
1056           read/write operations on these variables. Say Y if you have
1057           secure boot enabled and want to expose variables to userspace.
1058 
1059 endmenu
1060 
1061 config ISA_DMA_API
1062         bool
1063         default PCI
1064 
1065 menu "Bus options"
1066 
1067 config ISA
1068         bool "Support for ISA-bus hardware"
1069         depends on PPC_CHRP
1070         select PPC_I8259
1071         help
1072           Find out whether you have ISA slots on your motherboard.  ISA is the
1073           name of a bus system, i.e. the way the CPU talks to the other stuff
1074           inside your box.  If you have an Apple machine, say N here; if you
1075           have an IBM RS/6000 or pSeries machine, say Y.  If you have an
1076           embedded board, consult your board documentation.
1077 
1078 config GENERIC_ISA_DMA
1079         bool
1080         depends on ISA_DMA_API
1081         default y
1082 
1083 config PPC_INDIRECT_PCI
1084         bool
1085         depends on PCI
1086         default y if 44x
1087 
1088 config SBUS
1089         bool
1090 
1091 config FSL_SOC
1092         bool
1093 
1094 config FSL_PCI
1095         bool
1096         select ARCH_HAS_DMA_SET_MASK
1097         select PPC_INDIRECT_PCI
1098         select PCI_QUIRKS
1099 
1100 config FSL_PMC
1101         bool
1102         default y
1103         depends on SUSPEND && (PPC_85xx || PPC_86xx)
1104         help
1105           Freescale MPC85xx/MPC86xx power management controller support
1106           (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1107 
1108 config PPC4xx_CPM
1109         bool
1110         default y
1111         depends on SUSPEND && 44x
1112         help
1113           PPC4xx Clock Power Management (CPM) support (suspend/resume).
1114           It also enables support for two different idle states (idle-wait
1115           and idle-doze).
1116 
1117 config FSL_LBC
1118         bool "Freescale Local Bus support"
1119         help
1120           Enables reporting of errors from the Freescale local bus
1121           controller.  Also contains some common code used by
1122           drivers for specific local bus peripherals.
1123 
1124 config FSL_GTM
1125         bool
1126         depends on PPC_83xx || QUICC_ENGINE || CPM2
1127         help
1128           Freescale General-purpose Timers support
1129 
1130 config FSL_RIO
1131         bool "Freescale Embedded SRIO Controller support"
1132         depends on RAPIDIO = y && HAVE_RAPIDIO
1133         default "n"
1134         help
1135           Include support for RapidIO controller on Freescale embedded
1136           processors (MPC8548, MPC8641, etc).
1137 
1138 endmenu
1139 
1140 config NONSTATIC_KERNEL
1141         bool
1142 
1143 menu "Advanced setup"
1144         depends on PPC32
1145 
1146 config ADVANCED_OPTIONS
1147         bool "Prompt for advanced kernel configuration options"
1148         help
1149           This option will enable prompting for a variety of advanced kernel
1150           configuration options.  These options can cause the kernel to not
1151           work if they are set incorrectly, but can be used to optimize certain
1152           aspects of kernel memory management.
1153 
1154           Unless you know what you are doing, say N here.
1155 
1156 comment "Default settings for advanced configuration options are used"
1157         depends on !ADVANCED_OPTIONS
1158 
1159 config LOWMEM_SIZE_BOOL
1160         bool "Set maximum low memory"
1161         depends on ADVANCED_OPTIONS
1162         help
1163           This option allows you to set the maximum amount of memory which
1164           will be used as "low memory", that is, memory which the kernel can
1165           access directly, without having to set up a kernel virtual mapping.
1166           This can be useful in optimizing the layout of kernel virtual
1167           memory.
1168 
1169           Say N here unless you know what you are doing.
1170 
1171 config LOWMEM_SIZE
1172         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1173         default "0x30000000"
1174 
1175 config LOWMEM_CAM_NUM_BOOL
1176         bool "Set number of CAMs to use to map low memory"
1177         depends on ADVANCED_OPTIONS && PPC_85xx
1178         help
1179           This option allows you to set the maximum number of CAM slots that
1180           will be used to map low memory.  There are a limited number of slots
1181           available and even more limited number that will fit in the L1 MMU.
1182           However, using more entries will allow mapping more low memory.  This
1183           can be useful in optimizing the layout of kernel virtual memory.
1184 
1185           Say N here unless you know what you are doing.
1186 
1187 config LOWMEM_CAM_NUM
1188         depends on PPC_85xx
1189         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1190         default 3 if !STRICT_KERNEL_RWX
1191         default 9 if DATA_SHIFT >= 24
1192         default 12 if DATA_SHIFT >= 22
1193         default 15
1194 
1195 config DYNAMIC_MEMSTART
1196         bool "Enable page aligned dynamic load address for kernel"
1197         depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1198         select NONSTATIC_KERNEL
1199         help
1200           This option enables the kernel to be loaded at any page aligned
1201           physical address. The kernel creates a mapping from KERNELBASE to
1202           the address where the kernel is loaded. The page size here implies
1203           the TLB page size of the mapping for kernel on the particular platform.
1204           Please refer to the init code for finding the TLB page size.
1205 
1206           DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1207           kernel image, where the only restriction is the page aligned kernel
1208           load address. When this option is enabled, the compile time physical
1209           address CONFIG_PHYSICAL_START is ignored.
1210 
1211           This option is overridden by CONFIG_RELOCATABLE
1212 
1213 config PAGE_OFFSET_BOOL
1214         bool "Set custom page offset address"
1215         depends on ADVANCED_OPTIONS
1216         help
1217           This option allows you to set the kernel virtual address at which
1218           the kernel will map low memory.  This can be useful in optimizing
1219           the virtual memory layout of the system.
1220 
1221           Say N here unless you know what you are doing.
1222 
1223 config PAGE_OFFSET
1224         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1225         default "0xc0000000"
1226 
1227 config KERNEL_START_BOOL
1228         bool "Set custom kernel base address"
1229         depends on ADVANCED_OPTIONS
1230         help
1231           This option allows you to set the kernel virtual address at which
1232           the kernel will be loaded.  Normally this should match PAGE_OFFSET
1233           however there are times (like kdump) that one might not want them
1234           to be the same.
1235 
1236           Say N here unless you know what you are doing.
1237 
1238 config KERNEL_START
1239         hex "Virtual address of kernel base" if KERNEL_START_BOOL
1240         default PAGE_OFFSET if PAGE_OFFSET_BOOL
1241         default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1242         default "0xc0000000"
1243 
1244 config PHYSICAL_START_BOOL
1245         bool "Set physical address where the kernel is loaded"
1246         depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1247         help
1248           This gives the physical address where the kernel is loaded.
1249 
1250           Say N here unless you know what you are doing.
1251 
1252 config PHYSICAL_START
1253         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1254         default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1255         default "0x00000000"
1256 
1257 config PHYSICAL_ALIGN
1258         hex
1259         default "0x04000000" if PPC_85xx
1260         help
1261           This value puts the alignment restrictions on physical address
1262           where kernel is loaded and run from. Kernel is compiled for an
1263           address which meets above alignment restriction.
1264 
1265 config TASK_SIZE_BOOL
1266         bool "Set custom user task size"
1267         depends on ADVANCED_OPTIONS
1268         help
1269           This option allows you to set the amount of virtual address space
1270           allocated to user tasks.  This can be useful in optimizing the
1271           virtual memory layout of the system.
1272 
1273           Say N here unless you know what you are doing.
1274 
1275 config TASK_SIZE
1276         hex "Size of user task space" if TASK_SIZE_BOOL
1277         default "0x80000000" if PPC_8xx
1278         default "0xb0000000" if PPC_BOOK3S_32 && EXECMEM
1279         default "0xc0000000"
1280 
1281 config MODULES_SIZE_BOOL
1282         bool "Set custom size for modules/execmem area"
1283         depends on EXECMEM && ADVANCED_OPTIONS
1284         help
1285           This option allows you to set the size of kernel virtual address
1286           space dedicated for modules/execmem.
1287           For the time being it is only for 8xx and book3s/32. Other
1288           platform share it with vmalloc space.
1289 
1290           Say N here unless you know what you are doing.
1291 
1292 config MODULES_SIZE
1293         int "Size of modules/execmem area (In Mbytes)" if MODULES_SIZE_BOOL
1294         range 1 256 if EXECMEM
1295         default 64 if EXECMEM && PPC_BOOK3S_32
1296         default 32 if EXECMEM && PPC_8xx
1297         default 0
1298 
1299 endmenu
1300 
1301 if PPC64
1302 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1303 config PAGE_OFFSET
1304         hex
1305         default "0xc000000000000000"
1306 config KERNEL_START
1307         hex
1308         default "0xc000000000000000"
1309 config PHYSICAL_START
1310         hex
1311         default "0x00000000"
1312 endif
1313 
1314 config PPC_LIB_RHEAP
1315         bool
1316 
1317 source "arch/powerpc/kvm/Kconfig"
1318 
1319 source "kernel/livepatch/Kconfig"

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