1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
5 def_bool PPC64 && $(cc-option, -mabi=elfv2)
8 def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)
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
16 def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel)
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
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)
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)
49 # For 32-bit, use the compat values, as they're the same.
50 default ARCH_MMAP_RND_COMPAT_BITS_MAX
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)
57 # For 32-bit, use the compat values, as they're the same.
58 default ARCH_MMAP_RND_COMPAT_BITS_MIN
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)
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)
77 int "Number of virtual interrupt numbers"
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.
88 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
93 depends on HARDLOCKUP_DETECTOR_ARCH
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.
101 config STACKTRACE_SUPPORT
105 config LOCKDEP_SUPPORT
109 config GENERIC_LOCKBREAK
112 depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS
114 config GENERIC_HWEIGHT
122 # Please keep this list sorted alphabetically.
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
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
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
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
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 && 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
238 select HAVE_EFFICIENT_UNALIGNED_ACCESS
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
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
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
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
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
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
314 # Please keep this list sorted alphabetically.
317 config PPC_BARRIER_NOSPEC
320 depends on PPC_BOOK3S_64 || PPC_E500
322 config PPC_HAS_LBARX_LHARX
334 bool "Enable support for 32bit binaries"
336 default y if !CPU_LITTLE_ENDIAN
337 select ARCH_WANT_OLD_COMPAT_IPC
338 select COMPAT_OLD_SIGACTION
340 config SCHED_OMIT_FRAME_POINTER
344 config ARCH_MAY_HAVE_PC_FDC
348 config PPC_UDBG_16550
351 config GENERIC_TBSYNC
353 default y if PPC32 && SMP
364 config GENERIC_BUG_RELATIVE_POINTERS
366 depends on GENERIC_BUG
368 config SYS_SUPPORTS_APM_EMULATION
369 default y if PMAC_APM_EMU
375 Used to allow a board to specify it wants an ePAPR compliant wrapper.
377 config DEFAULT_UIMAGE
380 Used to allow a board to specify it wants a uImage built by default
382 config ARCH_HIBERNATION_POSSIBLE
386 config ARCH_SUSPEND_POSSIBLE
388 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
389 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
392 config ARCH_SUSPEND_NONZERO_CPU
394 depends on PPC_POWERNV || PPC_PSERIES
396 config ARCH_HAS_ADD_PAGES
398 depends on ARCH_ENABLE_MEMORY_HOTPLUG
400 config PPC_DCR_NATIVE
408 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
411 config PPC_PCI_OF_BUS_MAP
412 bool "Use pci_to_OF_bus_map (deprecated)"
414 depends on PPC_PMAC || PPC_CHRP
416 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which
417 restricts the system to only having 256 PCI buses. On CHRP it also causes
418 the "pci-OF-bus-map" property to be created in the device tree.
422 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
424 depends on !PPC_PCI_OF_BUS_MAP
425 bool "Assign PCI bus numbers from zero individually for each PCI domain"
428 By default on PPC32 were PCI bus numbers unique across all PCI domains.
429 So system could have only 256 PCI buses independently of available
430 PCI domains. When this option is enabled then PCI bus numbers are
431 PCI domain dependent and each PCI controller on own domain can have
432 256 PCI buses, like it is on other Linux architectures.
434 config PPC_OF_PLATFORM_PCI
437 depends on PPC64 # not supported on 32 bits yet
439 config ARCH_SUPPORTS_UPROBES
442 config PPC_ADV_DEBUG_REGS
444 depends on 40x || BOOKE
447 config PPC_ADV_DEBUG_IACS
449 depends on PPC_ADV_DEBUG_REGS
453 config PPC_ADV_DEBUG_DACS
455 depends on PPC_ADV_DEBUG_REGS
458 config PPC_ADV_DEBUG_DVCS
460 depends on PPC_ADV_DEBUG_REGS
464 config PPC_ADV_DEBUG_DAC_RANGE
466 depends on PPC_ADV_DEBUG_REGS && 44x
472 config PGTABLE_LEVELS
477 source "arch/powerpc/sysdev/Kconfig"
478 source "arch/powerpc/platforms/Kconfig"
480 menu "Kernel options"
483 bool "High memory support"
487 source "kernel/Kconfig.hz"
489 config MATH_EMULATION
490 bool "Math emulation"
491 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
494 Some PowerPC chips designed for embedded applications do not have
495 a floating-point unit and therefore do not implement the
496 floating-point instructions in the PowerPC instruction set. If you
497 say Y here, the kernel will include code to emulate a floating-point
498 unit, which will allow programs that use floating-point
501 This is also useful to emulate missing (optional) instructions
502 such as fsqrt on cores that do have an FPU but do not implement
503 them (such as Freescale BookE).
506 prompt "Math emulation options"
507 default MATH_EMULATION_FULL
508 depends on MATH_EMULATION
510 config MATH_EMULATION_FULL
511 bool "Emulate all the floating point instructions"
513 Select this option will enable the kernel to support to emulate
514 all the floating point instructions. If your SoC doesn't have
515 a FPU, you should select this.
517 config MATH_EMULATION_HW_UNIMPLEMENTED
518 bool "Just emulate the FPU unimplemented instructions"
520 Select this if you know there does have a hardware FPU on your
521 SoC, but some floating point instructions are not implemented by that.
525 config PPC_TRANSACTIONAL_MEM
526 bool "Transactional Memory support for POWERPC"
527 depends on PPC_BOOK3S_64
532 Support user-mode Transactional Memory on POWERPC.
535 bool "Ultravisor support"
536 depends on KVM_BOOK3S_HV_POSSIBLE
537 depends on DEVICE_PRIVATE
540 This option paravirtualizes the kernel to run in POWER platforms that
541 supports the Protected Execution Facility (PEF). On such platforms,
542 the ultravisor firmware runs at a privilege level above the
547 config LD_HEAD_STUB_CATCH
548 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
551 Very large kernels can cause linker branch stubs to be generated by
552 code in head_64.S, which moves the head text sections out of their
553 specified location. This option can work around the problem.
557 config MPROFILE_KERNEL
558 depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER
559 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN
560 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN
562 config ARCH_USING_PATCHABLE_FUNCTION_ENTRY
563 depends on FUNCTION_TRACER && (PPC32 || PPC64_ELF_ABI_V2)
564 depends on $(cc-option,-fpatchable-function-entry=2)
566 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN
567 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN
570 bool "Support for enabling/disabling CPUs"
571 depends on SMP && (PPC_PSERIES || \
572 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
574 Say Y here to be able to disable and re-enable individual
575 CPUs at runtime on SMP machines.
577 Say N if you are unsure.
579 config INTERRUPT_SANITIZE_REGISTERS
580 bool "Clear gprs on interrupt arrival"
581 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
582 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
584 Reduce the influence of user register state on interrupt handlers and
585 syscalls through clearing user state from registers before handling
588 config PPC_QUEUED_SPINLOCKS
589 bool "Queued spinlocks" if EXPERT
591 default PPC_BOOK3S_64
593 Say Y here to use queued spinlocks which give better scalability and
594 fairness on large SMP and NUMA systems without harming single threaded
597 config ARCH_CPU_PROBE_RELEASE
599 depends on HOTPLUG_CPU
601 config PPC64_SUPPORTS_MEMORY_FAILURE
602 bool "Add support for memory hwpoison"
603 depends on PPC_BOOK3S_64
604 default "y" if PPC_POWERNV
605 select ARCH_SUPPORTS_MEMORY_FAILURE
607 config ARCH_SUPPORTS_KEXEC
608 def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP)
610 config ARCH_SUPPORTS_KEXEC_FILE
613 config ARCH_SUPPORTS_KEXEC_PURGATORY
616 config ARCH_SELECTS_KEXEC_FILE
618 depends on KEXEC_FILE
620 select HAVE_IMA_KEXEC if IMA
622 config PPC64_BIG_ENDIAN_ELF_ABI_V2
623 # Option is available to BFD, but LLD does not support ELFv1 so this is
625 prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT
627 depends on PPC64 && CPU_BIG_ENDIAN
628 depends on CC_HAS_ELFV2
630 This builds the kernel image using the "Power Architecture 64-Bit ELF
631 V2 ABI Specification", which has a reduced stack overhead and faster
632 function calls. This internal kernel ABI option does not affect
633 userspace compatibility.
635 The V2 ABI is standard for 64-bit little-endian, but for big-endian
636 it is less well tested by kernel and toolchain. However some distros
637 build userspace this way, and it can produce a functioning kernel.
640 bool "Build a relocatable kernel"
641 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
642 select NONSTATIC_KERNEL
644 This builds a kernel image that is capable of running at the
645 location the kernel is loaded at. For ppc32, there is no any
646 alignment restrictions, and this feature is a superset of
647 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
648 16k-aligned base address. The kernel is linked as a
649 position-independent executable (PIE) and contains dynamic relocations
650 which are processed early in the bootup process.
652 One use is for the kexec on panic case where the recovery kernel
653 must live at a different physical address than the primary
656 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
657 it has been loaded at and the compile time physical addresses
658 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
659 setting can still be useful to bootwrappers that need to know the
660 load address of the kernel (eg. u-boot/mkimage).
662 config RANDOMIZE_BASE
663 bool "Randomize the address of the kernel image"
664 depends on PPC_85xx && FLATMEM
665 depends on RELOCATABLE
667 Randomizes the virtual address at which the kernel image is
668 loaded, as a security feature that deters exploit attempts
669 relying on knowledge of the location of kernel internals.
673 config RELOCATABLE_TEST
674 bool "Test relocatable kernel"
675 depends on (PPC64 && RELOCATABLE)
677 This runs the relocatable kernel at the address it was initially
678 loaded at, which tends to be non-zero and therefore test the
681 config ARCH_SUPPORTS_CRASH_DUMP
682 def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
684 config ARCH_SELECTS_CRASH_DUMP
686 depends on CRASH_DUMP
687 select RELOCATABLE if PPC64 || 44x || PPC_85xx
690 bool "Firmware-assisted dump"
691 depends on CRASH_DUMP && PPC64 && (PPC_RTAS || PPC_POWERNV)
693 A robust mechanism to get reliable kernel crash dump with
694 assistance from firmware. This approach does not use kexec,
695 instead firmware assists in booting the capture kernel
696 while preserving memory contents. Firmware-assisted dump
697 is meant to be a kdump replacement offering robustness and
698 speed not possible without system firmware assistance.
700 If unsure, say "y". Only special kernels like petitboot may
701 need to say "N" here.
703 config PRESERVE_FA_DUMP
704 bool "Preserve Firmware-assisted dump"
705 depends on PPC64 && PPC_POWERNV && !FA_DUMP
707 On a kernel with FA_DUMP disabled, this option helps to preserve
708 crash data from a previously crash'ed kernel. Useful when the next
709 memory preserving kernel boot would process this crash data.
710 Petitboot kernel is the typical usecase for this option.
713 bool "Export OPAL memory as /sys/firmware/opal/core"
714 depends on PPC64 && PPC_POWERNV
716 This option uses the MPIPL support in firmware to provide an
717 ELF core of OPAL memory after a crash. The ELF core is exported
718 as /sys/firmware/opal/core file which is helpful in debugging
719 OPAL crashes using GDB.
722 bool "Distribute interrupts on all CPUs by default"
725 This option gives the kernel permission to distribute IRQs across
726 multiple CPUs. Saying N here will route all IRQs to the first
727 CPU. Generally saying Y is safe, although some problems have been
728 reported with SMP Power Macintoshes with this option enabled.
731 bool "NUMA Memory Allocation and Scheduler Support"
732 depends on PPC64 && SMP
733 default y if PPC_PSERIES || PPC_POWERNV
734 select USE_PERCPU_NUMA_NODE_ID
736 Enable NUMA (Non-Uniform Memory Access) support.
738 The kernel will try to allocate memory used by a CPU on the
739 local memory controller of the CPU and add some more
740 NUMA awareness to the kernel.
748 config HAVE_MEMORYLESS_NODES
752 config ARCH_SELECT_MEMORY_MODEL
756 config ARCH_FLATMEM_ENABLE
758 depends on (PPC64 && !NUMA) || PPC32
760 config ARCH_SPARSEMEM_ENABLE
763 select SPARSEMEM_VMEMMAP_ENABLE
765 config ARCH_SPARSEMEM_DEFAULT
767 depends on PPC_BOOK3S_64
769 config ILLEGAL_POINTER_VALUE
771 # This is roughly half way between the top of user space and the bottom
772 # of kernel space, which seems about as good as we can get.
773 default 0x5deadbeef0000000 if PPC64
776 config ARCH_MEMORY_PROBE
778 depends on MEMORY_HOTPLUG
782 default PPC_64K_PAGES if PPC_BOOK3S_64
785 Select the kernel logical page size. Increasing the page size
786 will reduce software overhead at each page boundary, allow
787 hardware prefetch mechanisms to be more effective, and allow
788 larger dma transfers increasing IO efficiency and reducing
789 overhead. However the utilization of memory will increase.
790 For example, each cached file will using a multiple of the
791 page size to hold its contents and the difference between the
792 end of file and the end of page is wasted.
794 Some dedicated systems, such as software raid serving with
795 accelerated calculations, have shown significant increases.
797 If you configure a 64 bit kernel for 64k pages but the
798 processor does not support them, then the kernel will simulate
799 them with 4k pages, loading them on demand, but with the
800 reduced software overhead and larger internal fragmentation.
801 For the 32 bit kernel, a large page option will not be offered
802 unless it is supported by the configured processor.
804 If unsure, choose 4K_PAGES.
808 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
809 select HAVE_PAGE_SIZE_4KB
813 depends on 44x || PPC_8xx
814 select HAVE_PAGE_SIZE_16KB
818 depends on 44x || PPC_BOOK3S_64
819 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
820 select HAVE_PAGE_SIZE_64KB
822 config PPC_256K_PAGES
823 bool "256k page size (Requires non-standard binutils settings)"
824 depends on 44x && !PPC_47x
825 select HAVE_PAGE_SIZE_256KB
827 Make the page size 256k.
829 The kernel will only be able to run applications that have been
830 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
831 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
832 definition from 0x10000 to 0x40000 in older versions.
837 int "Thread shift" if EXPERT
839 default "15" if PPC_256K_PAGES
840 default "15" if PPC_PSERIES || PPC_POWERNV
841 default "14" if PPC64
844 Used to define the stack size. The default is almost always what you
845 want. Only change this if you know what you are doing.
847 config DATA_SHIFT_BOOL
848 bool "Set custom data alignment"
849 depends on ADVANCED_OPTIONS
850 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
851 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
854 This option allows you to set the kernel data alignment. When
855 RAM is mapped by blocks, the alignment needs to fit the size and
856 number of possible blocks. The default should be OK for most configs.
858 Say N here unless you know what you are doing.
861 int "Data shift" if DATA_SHIFT_BOOL
862 default 24 if STRICT_KERNEL_RWX && PPC64
863 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
864 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
865 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
866 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
867 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
868 default 23 if STRICT_KERNEL_RWX && PPC_8xx
869 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
870 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
871 default 24 if STRICT_KERNEL_RWX && PPC_85xx
874 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
875 Smaller is the alignment, greater is the number of necessary DBATs.
877 On 8xx, large pages (512kb or 8M) are used to map kernel linear
878 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
879 in that case. If PIN_TLB is selected, it must be aligned to 8M as
880 8M pages will be pinned.
882 config ARCH_FORCE_MAX_ORDER
883 int "Order of maximal physically contiguous allocations"
884 range 7 8 if PPC64 && PPC_64K_PAGES
885 default "8" if PPC64 && PPC_64K_PAGES
886 range 12 12 if PPC64 && !PPC_64K_PAGES
887 default "12" if PPC64 && !PPC_64K_PAGES
888 range 8 10 if PPC32 && PPC_16K_PAGES
889 default "8" if PPC32 && PPC_16K_PAGES
890 range 6 10 if PPC32 && PPC_64K_PAGES
891 default "6" if PPC32 && PPC_64K_PAGES
892 range 4 10 if PPC32 && PPC_256K_PAGES
893 default "4" if PPC32 && PPC_256K_PAGES
897 The kernel page allocator limits the size of maximal physically
898 contiguous allocations. The limit is called MAX_PAGE_ORDER and it
899 defines the maximal power of two of number of pages that can be
900 allocated as a single contiguous block. This option allows
901 overriding the default setting when ability to allocate very
902 large blocks of physically contiguous memory is required.
904 The page size is not necessarily 4KB. For example, on 64-bit
905 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
906 this in mind when choosing a value for this option.
908 Don't change if unsure.
910 config PPC_SUBPAGE_PROT
911 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
913 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
915 This option adds support for system call to allow user programs
916 to set access permissions (read/write, readonly, or no access)
917 on the 4k subpages of each 64k page.
919 If unsure, say N here.
921 config PPC_PROT_SAO_LPAR
922 bool "Support PROT_SAO mappings in LPARs"
923 depends on PPC_BOOK3S_64
925 This option adds support for PROT_SAO mappings from userspace
926 inside LPARs on supported CPUs.
928 This may cause issues when performing guest migration from
929 a CPU that supports SAO to one that does not.
931 If unsure, say N here.
933 config PPC_COPRO_BASE
937 bool "SMT (Hyperthreading) scheduler support"
938 depends on PPC64 && SMP
940 SMT scheduler support improves the CPU scheduler's decision making
941 when dealing with POWER5 cpus at a cost of slightly increased
942 overhead in some places. If unsure say N here.
944 config PPC_DENORMALISATION
945 bool "PowerPC denormalisation exception handling"
946 depends on PPC_BOOK3S_64
947 default "y" if PPC_POWERNV
949 Add support for handling denormalisation of single precision
950 values. Useful for bare metal only. If unsure say Y here.
953 string "Initial kernel command string"
956 On some platforms, there is currently no way for the boot loader to
957 pass arguments to the kernel. For these platforms, you can supply
958 some command-line options at build time by entering them here. In
959 most cases you will need to specify the root device here.
962 prompt "Kernel command line type" if CMDLINE != ""
963 default CMDLINE_FROM_BOOTLOADER
965 config CMDLINE_FROM_BOOTLOADER
966 bool "Use bootloader kernel arguments if available"
968 Uses the command-line options passed by the boot loader. If
969 the boot loader doesn't provide any, the default kernel command
970 string provided in CMDLINE will be used.
972 config CMDLINE_EXTEND
973 bool "Extend bootloader kernel arguments"
975 The command-line arguments provided by the boot loader will be
976 appended to the default kernel command string.
979 bool "Always use the default kernel command string"
981 Always use the default kernel command string, even if the boot
982 loader passes other arguments to the kernel.
983 This is useful if you cannot or don't want to change the
984 command-line options your boot loader passes to the kernel.
989 string "Additional default image types"
991 List additional targets to be built by the bootwrapper here (separated
992 by spaces). This is useful for targets that depend of device tree
993 files in the .dts directory.
995 Targets in this list will be build as part of the default build
996 target, or when the user does a 'make zImage' or a
997 'make zImage.initrd'.
999 If unsure, leave blank
1001 config ARCH_WANTS_FREEZER_CONTROL
1005 source "kernel/power/Kconfig"
1008 prompt "PowerPC Memory Protection Keys"
1010 depends on PPC_BOOK3S_64
1011 depends on PPC_64S_HASH_MMU
1012 select ARCH_USES_HIGH_VMA_FLAGS
1013 select ARCH_HAS_PKEYS
1015 Memory Protection Keys provides a mechanism for enforcing
1016 page-based protections, but without requiring modification of the
1017 page tables when an application changes protection domains.
1019 For details, see Documentation/core-api/protection-keys.rst
1023 config PPC_SECURE_BOOT
1024 prompt "Enable secure boot support"
1026 depends on PPC_POWERNV || PPC_PSERIES
1027 depends on IMA_ARCH_POLICY
1028 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1029 select PSERIES_PLPKS if PPC_PSERIES
1031 Systems with firmware secure boot enabled need to define security
1032 policies to extend secure boot to the OS. This config allows a user
1033 to enable OS secure boot on systems that have firmware support for
1034 it. If in doubt say N.
1036 config PPC_SECVAR_SYSFS
1037 bool "Enable sysfs interface for POWER secure variables"
1039 depends on PPC_SECURE_BOOT
1042 POWER secure variables are managed and controlled by firmware.
1043 These variables are exposed to userspace via sysfs to enable
1044 read/write operations on these variables. Say Y if you have
1045 secure boot enabled and want to expose variables to userspace.
1056 bool "Support for ISA-bus hardware"
1060 Find out whether you have ISA slots on your motherboard. ISA is the
1061 name of a bus system, i.e. the way the CPU talks to the other stuff
1062 inside your box. If you have an Apple machine, say N here; if you
1063 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1064 embedded board, consult your board documentation.
1066 config GENERIC_ISA_DMA
1068 depends on ISA_DMA_API
1071 config PPC_INDIRECT_PCI
1074 default y if 40x || 44x
1084 select ARCH_HAS_DMA_SET_MASK
1085 select PPC_INDIRECT_PCI
1091 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1093 Freescale MPC85xx/MPC86xx power management controller support
1094 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1099 depends on SUSPEND && (44x || 40x)
1101 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1102 It also enables support for two different idle states (idle-wait
1109 bool "Freescale Local Bus support"
1111 Enables reporting of errors from the Freescale local bus
1112 controller. Also contains some common code used by
1113 drivers for specific local bus peripherals.
1117 depends on PPC_83xx || QUICC_ENGINE || CPM2
1119 Freescale General-purpose Timers support
1122 bool "Freescale Embedded SRIO Controller support"
1123 depends on RAPIDIO = y && HAVE_RAPIDIO
1126 Include support for RapidIO controller on Freescale embedded
1127 processors (MPC8548, MPC8641, etc).
1131 config NONSTATIC_KERNEL
1134 menu "Advanced setup"
1137 config ADVANCED_OPTIONS
1138 bool "Prompt for advanced kernel configuration options"
1140 This option will enable prompting for a variety of advanced kernel
1141 configuration options. These options can cause the kernel to not
1142 work if they are set incorrectly, but can be used to optimize certain
1143 aspects of kernel memory management.
1145 Unless you know what you are doing, say N here.
1147 comment "Default settings for advanced configuration options are used"
1148 depends on !ADVANCED_OPTIONS
1150 config LOWMEM_SIZE_BOOL
1151 bool "Set maximum low memory"
1152 depends on ADVANCED_OPTIONS
1154 This option allows you to set the maximum amount of memory which
1155 will be used as "low memory", that is, memory which the kernel can
1156 access directly, without having to set up a kernel virtual mapping.
1157 This can be useful in optimizing the layout of kernel virtual
1160 Say N here unless you know what you are doing.
1163 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1164 default "0x30000000"
1166 config LOWMEM_CAM_NUM_BOOL
1167 bool "Set number of CAMs to use to map low memory"
1168 depends on ADVANCED_OPTIONS && PPC_85xx
1170 This option allows you to set the maximum number of CAM slots that
1171 will be used to map low memory. There are a limited number of slots
1172 available and even more limited number that will fit in the L1 MMU.
1173 However, using more entries will allow mapping more low memory. This
1174 can be useful in optimizing the layout of kernel virtual memory.
1176 Say N here unless you know what you are doing.
1178 config LOWMEM_CAM_NUM
1180 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1181 default 3 if !STRICT_KERNEL_RWX
1182 default 9 if DATA_SHIFT >= 24
1183 default 12 if DATA_SHIFT >= 22
1186 config DYNAMIC_MEMSTART
1187 bool "Enable page aligned dynamic load address for kernel"
1188 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1189 select NONSTATIC_KERNEL
1191 This option enables the kernel to be loaded at any page aligned
1192 physical address. The kernel creates a mapping from KERNELBASE to
1193 the address where the kernel is loaded. The page size here implies
1194 the TLB page size of the mapping for kernel on the particular platform.
1195 Please refer to the init code for finding the TLB page size.
1197 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1198 kernel image, where the only restriction is the page aligned kernel
1199 load address. When this option is enabled, the compile time physical
1200 address CONFIG_PHYSICAL_START is ignored.
1202 This option is overridden by CONFIG_RELOCATABLE
1204 config PAGE_OFFSET_BOOL
1205 bool "Set custom page offset address"
1206 depends on ADVANCED_OPTIONS
1208 This option allows you to set the kernel virtual address at which
1209 the kernel will map low memory. This can be useful in optimizing
1210 the virtual memory layout of the system.
1212 Say N here unless you know what you are doing.
1215 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1216 default "0xc0000000"
1218 config KERNEL_START_BOOL
1219 bool "Set custom kernel base address"
1220 depends on ADVANCED_OPTIONS
1222 This option allows you to set the kernel virtual address at which
1223 the kernel will be loaded. Normally this should match PAGE_OFFSET
1224 however there are times (like kdump) that one might not want them
1227 Say N here unless you know what you are doing.
1230 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1231 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1232 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1233 default "0xc0000000"
1235 config PHYSICAL_START_BOOL
1236 bool "Set physical address where the kernel is loaded"
1237 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1239 This gives the physical address where the kernel is loaded.
1241 Say N here unless you know what you are doing.
1243 config PHYSICAL_START
1244 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1245 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1246 default "0x00000000"
1248 config PHYSICAL_ALIGN
1250 default "0x04000000" if PPC_85xx
1252 This value puts the alignment restrictions on physical address
1253 where kernel is loaded and run from. Kernel is compiled for an
1254 address which meets above alignment restriction.
1256 config TASK_SIZE_BOOL
1257 bool "Set custom user task size"
1258 depends on ADVANCED_OPTIONS
1260 This option allows you to set the amount of virtual address space
1261 allocated to user tasks. This can be useful in optimizing the
1262 virtual memory layout of the system.
1264 Say N here unless you know what you are doing.
1267 hex "Size of user task space" if TASK_SIZE_BOOL
1268 default "0x80000000" if PPC_8xx
1269 default "0xb0000000" if PPC_BOOK3S_32
1270 default "0xc0000000"
1274 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1277 default "0xc000000000000000"
1280 default "0xc000000000000000"
1281 config PHYSICAL_START
1283 default "0x00000000"
1286 config PPC_LIB_RHEAP
1289 source "arch/powerpc/kvm/Kconfig"
1291 source "kernel/livepatch/Kconfig"