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_SANITIZE_ALL
158 select ARCH_HAVE_NMI_SAFE_CMPXCHG
159 select ARCH_KEEP_MEMBLOCK
160 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if PPC_RADIX_MMU
161 select ARCH_MIGHT_HAVE_PC_PARPORT
162 select ARCH_MIGHT_HAVE_PC_SERIO
163 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
164 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
165 select ARCH_SPLIT_ARG64 if PPC32
166 select ARCH_STACKWALK
167 select ARCH_SUPPORTS_ATOMIC_RMW
168 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
169 select ARCH_USE_BUILTIN_BSWAP
170 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
171 select ARCH_USE_MEMTEST
172 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
173 select ARCH_WANT_DEFAULT_BPF_JIT
174 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
175 select ARCH_WANT_IPC_PARSE_VERSION
176 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
177 select ARCH_WANT_LD_ORPHAN_WARN
178 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP if PPC_RADIX_MMU
179 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
180 select ARCH_WEAK_RELEASE_ACQUIRE
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 GENERIC_ATOMIC64 if PPC32
192 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
193 select GENERIC_CMOS_UPDATE
194 select GENERIC_CPU_AUTOPROBE
195 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
196 select GENERIC_EARLY_IOREMAP
197 select GENERIC_GETTIMEOFDAY
198 select GENERIC_IOREMAP
199 select GENERIC_IRQ_SHOW
200 select GENERIC_IRQ_SHOW_LEVEL
201 select GENERIC_PCI_IOMAP if PCI
202 select GENERIC_PTDUMP
203 select GENERIC_SMP_IDLE_THREAD
204 select GENERIC_TIME_VSYSCALL
205 select GENERIC_VDSO_TIME_NS
206 select HAS_IOPORT if PCI
207 select HAVE_ARCH_AUDITSYSCALL
208 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
209 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
210 select HAVE_ARCH_JUMP_LABEL
211 select HAVE_ARCH_JUMP_LABEL_RELATIVE
212 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
213 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
214 select HAVE_ARCH_KASAN if PPC_BOOK3E_64
215 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
216 select HAVE_ARCH_KCSAN
217 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
218 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
219 select HAVE_ARCH_WITHIN_STACK_FRAMES
220 select HAVE_ARCH_KGDB
221 select HAVE_ARCH_MMAP_RND_BITS
222 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
223 select HAVE_ARCH_NVRAM_OPS
224 select HAVE_ARCH_SECCOMP_FILTER
225 select HAVE_ARCH_TRACEHOOK
226 select HAVE_ASM_MODVERSIONS
227 select HAVE_CONTEXT_TRACKING_USER
228 select HAVE_C_RECORDMCOUNT
229 select HAVE_DEBUG_KMEMLEAK
230 select HAVE_DEBUG_STACKOVERFLOW
231 select HAVE_DYNAMIC_FTRACE
232 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
233 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
235 select HAVE_EFFICIENT_UNALIGNED_ACCESS
237 select HAVE_FTRACE_MCOUNT_RECORD
238 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
239 select HAVE_FUNCTION_ERROR_INJECTION
240 select HAVE_FUNCTION_GRAPH_TRACER
241 select HAVE_FUNCTION_TRACER if PPC64 || (PPC32 && CC_IS_GCC)
242 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
243 select HAVE_GENERIC_VDSO
244 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
245 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
246 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
247 select HAVE_IOREMAP_PROT
248 select HAVE_IRQ_TIME_ACCOUNTING
249 select HAVE_KERNEL_GZIP
250 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
251 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
252 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
254 select HAVE_KPROBES_ON_FTRACE
255 select HAVE_KRETPROBES
256 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT
257 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
258 select HAVE_MOD_ARCH_SPECIFIC
259 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
260 select HAVE_OPTPROBES
261 select HAVE_OBJTOOL if PPC32 || MPROFILE_KERNEL
262 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
263 select HAVE_PERF_EVENTS
264 select HAVE_PERF_EVENTS_NMI if PPC64
265 select HAVE_PERF_REGS
266 select HAVE_PERF_USER_STACK_DUMP
267 select HAVE_REGS_AND_STACK_ACCESS_API
268 select HAVE_RELIABLE_STACKTRACE
270 select HAVE_SETUP_PER_CPU_AREA if PPC64
271 select HAVE_SOFTIRQ_ON_OWN_STACK
272 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
273 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
274 select HAVE_STATIC_CALL if PPC32
275 select HAVE_SYSCALL_TRACEPOINTS
276 select HAVE_VIRT_CPU_ACCOUNTING
277 select HAVE_VIRT_CPU_ACCOUNTING_GEN
278 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
279 select IOMMU_HELPER if PPC64
281 select IRQ_FORCED_THREADING
282 select KASAN_VMALLOC if KASAN && MODULES
283 select LOCK_MM_AND_FIND_VMA
284 select MMU_GATHER_PAGE_SIZE
285 select MMU_GATHER_RCU_TABLE_FREE
286 select MMU_GATHER_MERGE_VMAS
287 select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64
288 select MODULES_USE_ELF_RELA
289 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
290 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
291 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
292 select NEED_SG_DMA_LENGTH
294 select OF_EARLY_FLATTREE
295 select OLD_SIGACTION if PPC32
296 select OLD_SIGSUSPEND
297 select PCI_DOMAINS if PCI
298 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
299 select PCI_SYSCALL if PCI
300 select PPC_DAWR if PPC64
303 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
304 select SYSCTL_EXCEPTION_TRACE
305 select THREAD_INFO_IN_TASK
306 select TRACE_IRQFLAGS_SUPPORT
308 # Please keep this list sorted alphabetically.
311 config PPC_BARRIER_NOSPEC
314 depends on PPC_BOOK3S_64 || PPC_E500
316 config PPC_HAS_LBARX_LHARX
328 bool "Enable support for 32bit binaries"
330 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
331 default y if !CPU_LITTLE_ENDIAN
332 select ARCH_WANT_OLD_COMPAT_IPC
333 select COMPAT_OLD_SIGACTION
335 config SCHED_OMIT_FRAME_POINTER
339 config ARCH_MAY_HAVE_PC_FDC
343 config PPC_UDBG_16550
346 config GENERIC_TBSYNC
348 default y if PPC32 && SMP
359 config GENERIC_BUG_RELATIVE_POINTERS
361 depends on GENERIC_BUG
363 config SYS_SUPPORTS_APM_EMULATION
364 default y if PMAC_APM_EMU
370 Used to allow a board to specify it wants an ePAPR compliant wrapper.
372 config DEFAULT_UIMAGE
375 Used to allow a board to specify it wants a uImage built by default
377 config ARCH_HIBERNATION_POSSIBLE
381 config ARCH_SUSPEND_POSSIBLE
383 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
384 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
387 config ARCH_SUSPEND_NONZERO_CPU
389 depends on PPC_POWERNV || PPC_PSERIES
391 config ARCH_HAS_ADD_PAGES
393 depends on ARCH_ENABLE_MEMORY_HOTPLUG
395 config PPC_DCR_NATIVE
403 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
406 config PPC_PCI_OF_BUS_MAP
407 bool "Use pci_to_OF_bus_map (deprecated)"
409 depends on PPC_PMAC || PPC_CHRP
411 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which
412 restricts the system to only having 256 PCI buses. On CHRP it also causes
413 the "pci-OF-bus-map" property to be created in the device tree.
417 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
419 depends on !PPC_PCI_OF_BUS_MAP
420 bool "Assign PCI bus numbers from zero individually for each PCI domain"
423 By default on PPC32 were PCI bus numbers unique across all PCI domains.
424 So system could have only 256 PCI buses independently of available
425 PCI domains. When this option is enabled then PCI bus numbers are
426 PCI domain dependent and each PCI controller on own domain can have
427 256 PCI buses, like it is on other Linux architectures.
429 config PPC_OF_PLATFORM_PCI
432 depends on PPC64 # not supported on 32 bits yet
434 config ARCH_SUPPORTS_UPROBES
437 config PPC_ADV_DEBUG_REGS
439 depends on 40x || BOOKE
442 config PPC_ADV_DEBUG_IACS
444 depends on PPC_ADV_DEBUG_REGS
448 config PPC_ADV_DEBUG_DACS
450 depends on PPC_ADV_DEBUG_REGS
453 config PPC_ADV_DEBUG_DVCS
455 depends on PPC_ADV_DEBUG_REGS
459 config PPC_ADV_DEBUG_DAC_RANGE
461 depends on PPC_ADV_DEBUG_REGS && 44x
467 config PGTABLE_LEVELS
472 source "arch/powerpc/sysdev/Kconfig"
473 source "arch/powerpc/platforms/Kconfig"
475 menu "Kernel options"
478 bool "High memory support"
482 source "kernel/Kconfig.hz"
484 config MATH_EMULATION
485 bool "Math emulation"
486 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
489 Some PowerPC chips designed for embedded applications do not have
490 a floating-point unit and therefore do not implement the
491 floating-point instructions in the PowerPC instruction set. If you
492 say Y here, the kernel will include code to emulate a floating-point
493 unit, which will allow programs that use floating-point
496 This is also useful to emulate missing (optional) instructions
497 such as fsqrt on cores that do have an FPU but do not implement
498 them (such as Freescale BookE).
501 prompt "Math emulation options"
502 default MATH_EMULATION_FULL
503 depends on MATH_EMULATION
505 config MATH_EMULATION_FULL
506 bool "Emulate all the floating point instructions"
508 Select this option will enable the kernel to support to emulate
509 all the floating point instructions. If your SoC doesn't have
510 a FPU, you should select this.
512 config MATH_EMULATION_HW_UNIMPLEMENTED
513 bool "Just emulate the FPU unimplemented instructions"
515 Select this if you know there does have a hardware FPU on your
516 SoC, but some floating point instructions are not implemented by that.
520 config PPC_TRANSACTIONAL_MEM
521 bool "Transactional Memory support for POWERPC"
522 depends on PPC_BOOK3S_64
527 Support user-mode Transactional Memory on POWERPC.
530 bool "Ultravisor support"
531 depends on KVM_BOOK3S_HV_POSSIBLE
532 depends on DEVICE_PRIVATE
535 This option paravirtualizes the kernel to run in POWER platforms that
536 supports the Protected Execution Facility (PEF). On such platforms,
537 the ultravisor firmware runs at a privilege level above the
542 config LD_HEAD_STUB_CATCH
543 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
546 Very large kernels can cause linker branch stubs to be generated by
547 code in head_64.S, which moves the head text sections out of their
548 specified location. This option can work around the problem.
552 config MPROFILE_KERNEL
553 depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER
554 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN
555 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN
558 bool "Support for enabling/disabling CPUs"
559 depends on SMP && (PPC_PSERIES || \
560 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
562 Say Y here to be able to disable and re-enable individual
563 CPUs at runtime on SMP machines.
565 Say N if you are unsure.
567 config INTERRUPT_SANITIZE_REGISTERS
568 bool "Clear gprs on interrupt arrival"
569 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
570 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
572 Reduce the influence of user register state on interrupt handlers and
573 syscalls through clearing user state from registers before handling
576 config PPC_QUEUED_SPINLOCKS
577 bool "Queued spinlocks" if EXPERT
579 default PPC_BOOK3S_64
581 Say Y here to use queued spinlocks which give better scalability and
582 fairness on large SMP and NUMA systems without harming single threaded
585 config ARCH_CPU_PROBE_RELEASE
587 depends on HOTPLUG_CPU
589 config PPC64_SUPPORTS_MEMORY_FAILURE
590 bool "Add support for memory hwpoison"
591 depends on PPC_BOOK3S_64
592 default "y" if PPC_POWERNV
593 select ARCH_SUPPORTS_MEMORY_FAILURE
595 config ARCH_SUPPORTS_KEXEC
596 def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP)
598 config ARCH_SUPPORTS_KEXEC_FILE
599 def_bool PPC64 && CRYPTO=y && CRYPTO_SHA256=y
601 config ARCH_SUPPORTS_KEXEC_PURGATORY
604 config ARCH_SELECTS_KEXEC_FILE
606 depends on KEXEC_FILE
608 select HAVE_IMA_KEXEC if IMA
610 config PPC64_BIG_ENDIAN_ELF_ABI_V2
611 # Option is available to BFD, but LLD does not support ELFv1 so this is
613 prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT
615 depends on PPC64 && CPU_BIG_ENDIAN
616 depends on CC_HAS_ELFV2
618 This builds the kernel image using the "Power Architecture 64-Bit ELF
619 V2 ABI Specification", which has a reduced stack overhead and faster
620 function calls. This internal kernel ABI option does not affect
621 userspace compatibility.
623 The V2 ABI is standard for 64-bit little-endian, but for big-endian
624 it is less well tested by kernel and toolchain. However some distros
625 build userspace this way, and it can produce a functioning kernel.
628 bool "Build a relocatable kernel"
629 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
630 select NONSTATIC_KERNEL
632 This builds a kernel image that is capable of running at the
633 location the kernel is loaded at. For ppc32, there is no any
634 alignment restrictions, and this feature is a superset of
635 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
636 16k-aligned base address. The kernel is linked as a
637 position-independent executable (PIE) and contains dynamic relocations
638 which are processed early in the bootup process.
640 One use is for the kexec on panic case where the recovery kernel
641 must live at a different physical address than the primary
644 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
645 it has been loaded at and the compile time physical addresses
646 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
647 setting can still be useful to bootwrappers that need to know the
648 load address of the kernel (eg. u-boot/mkimage).
650 config RANDOMIZE_BASE
651 bool "Randomize the address of the kernel image"
652 depends on PPC_85xx && FLATMEM
653 depends on RELOCATABLE
655 Randomizes the virtual address at which the kernel image is
656 loaded, as a security feature that deters exploit attempts
657 relying on knowledge of the location of kernel internals.
661 config RELOCATABLE_TEST
662 bool "Test relocatable kernel"
663 depends on (PPC64 && RELOCATABLE)
665 This runs the relocatable kernel at the address it was initially
666 loaded at, which tends to be non-zero and therefore test the
669 config ARCH_SUPPORTS_CRASH_DUMP
670 def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
672 config ARCH_SELECTS_CRASH_DUMP
674 depends on CRASH_DUMP
675 select RELOCATABLE if PPC64 || 44x || PPC_85xx
678 bool "Firmware-assisted dump"
679 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
683 A robust mechanism to get reliable kernel crash dump with
684 assistance from firmware. This approach does not use kexec,
685 instead firmware assists in booting the capture kernel
686 while preserving memory contents. Firmware-assisted dump
687 is meant to be a kdump replacement offering robustness and
688 speed not possible without system firmware assistance.
690 If unsure, say "y". Only special kernels like petitboot may
691 need to say "N" here.
693 config PRESERVE_FA_DUMP
694 bool "Preserve Firmware-assisted dump"
695 depends on PPC64 && PPC_POWERNV && !FA_DUMP
697 On a kernel with FA_DUMP disabled, this option helps to preserve
698 crash data from a previously crash'ed kernel. Useful when the next
699 memory preserving kernel boot would process this crash data.
700 Petitboot kernel is the typical usecase for this option.
703 bool "Export OPAL memory as /sys/firmware/opal/core"
704 depends on PPC64 && PPC_POWERNV
706 This option uses the MPIPL support in firmware to provide an
707 ELF core of OPAL memory after a crash. The ELF core is exported
708 as /sys/firmware/opal/core file which is helpful in debugging
709 OPAL crashes using GDB.
712 bool "Distribute interrupts on all CPUs by default"
715 This option gives the kernel permission to distribute IRQs across
716 multiple CPUs. Saying N here will route all IRQs to the first
717 CPU. Generally saying Y is safe, although some problems have been
718 reported with SMP Power Macintoshes with this option enabled.
721 bool "NUMA Memory Allocation and Scheduler Support"
722 depends on PPC64 && SMP
723 default y if PPC_PSERIES || PPC_POWERNV
724 select USE_PERCPU_NUMA_NODE_ID
726 Enable NUMA (Non-Uniform Memory Access) support.
728 The kernel will try to allocate memory used by a CPU on the
729 local memory controller of the CPU and add some more
730 NUMA awareness to the kernel.
738 config HAVE_MEMORYLESS_NODES
742 config ARCH_SELECT_MEMORY_MODEL
746 config ARCH_FLATMEM_ENABLE
748 depends on (PPC64 && !NUMA) || PPC32
750 config ARCH_SPARSEMEM_ENABLE
753 select SPARSEMEM_VMEMMAP_ENABLE
755 config ARCH_SPARSEMEM_DEFAULT
757 depends on PPC_BOOK3S_64
759 config ILLEGAL_POINTER_VALUE
761 # This is roughly half way between the top of user space and the bottom
762 # of kernel space, which seems about as good as we can get.
763 default 0x5deadbeef0000000 if PPC64
766 config ARCH_MEMORY_PROBE
768 depends on MEMORY_HOTPLUG
772 default PPC_64K_PAGES if PPC_BOOK3S_64
775 Select the kernel logical page size. Increasing the page size
776 will reduce software overhead at each page boundary, allow
777 hardware prefetch mechanisms to be more effective, and allow
778 larger dma transfers increasing IO efficiency and reducing
779 overhead. However the utilization of memory will increase.
780 For example, each cached file will using a multiple of the
781 page size to hold its contents and the difference between the
782 end of file and the end of page is wasted.
784 Some dedicated systems, such as software raid serving with
785 accelerated calculations, have shown significant increases.
787 If you configure a 64 bit kernel for 64k pages but the
788 processor does not support them, then the kernel will simulate
789 them with 4k pages, loading them on demand, but with the
790 reduced software overhead and larger internal fragmentation.
791 For the 32 bit kernel, a large page option will not be offered
792 unless it is supported by the configured processor.
794 If unsure, choose 4K_PAGES.
798 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
802 depends on 44x || PPC_8xx
806 depends on 44x || PPC_BOOK3S_64
807 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
809 config PPC_256K_PAGES
810 bool "256k page size (Requires non-standard binutils settings)"
811 depends on 44x && !PPC_47x
813 Make the page size 256k.
815 The kernel will only be able to run applications that have been
816 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
817 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
818 definition from 0x10000 to 0x40000 in older versions.
824 depends on PPC_4K_PAGES
826 config PAGE_SIZE_16KB
828 depends on PPC_16K_PAGES
830 config PAGE_SIZE_64KB
832 depends on PPC_64K_PAGES
834 config PAGE_SIZE_256KB
836 depends on PPC_256K_PAGES
838 config PPC_PAGE_SHIFT
840 default 18 if PPC_256K_PAGES
841 default 16 if PPC_64K_PAGES
842 default 14 if PPC_16K_PAGES
846 int "Thread shift" if EXPERT
848 default "15" if PPC_256K_PAGES
849 default "14" if PPC64
852 Used to define the stack size. The default is almost always what you
853 want. Only change this if you know what you are doing.
855 config DATA_SHIFT_BOOL
856 bool "Set custom data alignment"
857 depends on ADVANCED_OPTIONS
858 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
859 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
862 This option allows you to set the kernel data alignment. When
863 RAM is mapped by blocks, the alignment needs to fit the size and
864 number of possible blocks. The default should be OK for most configs.
866 Say N here unless you know what you are doing.
869 int "Data shift" if DATA_SHIFT_BOOL
870 default 24 if STRICT_KERNEL_RWX && PPC64
871 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
872 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
873 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
874 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
875 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
876 default 23 if STRICT_KERNEL_RWX && PPC_8xx
877 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
878 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
879 default 24 if STRICT_KERNEL_RWX && PPC_85xx
880 default PPC_PAGE_SHIFT
882 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
883 Smaller is the alignment, greater is the number of necessary DBATs.
885 On 8xx, large pages (512kb or 8M) are used to map kernel linear
886 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
887 in that case. If PIN_TLB is selected, it must be aligned to 8M as
888 8M pages will be pinned.
890 config ARCH_FORCE_MAX_ORDER
891 int "Order of maximal physically contiguous allocations"
892 range 7 8 if PPC64 && PPC_64K_PAGES
893 default "8" if PPC64 && PPC_64K_PAGES
894 range 12 12 if PPC64 && !PPC_64K_PAGES
895 default "12" if PPC64 && !PPC_64K_PAGES
896 range 8 10 if PPC32 && PPC_16K_PAGES
897 default "8" if PPC32 && PPC_16K_PAGES
898 range 6 10 if PPC32 && PPC_64K_PAGES
899 default "6" if PPC32 && PPC_64K_PAGES
900 range 4 10 if PPC32 && PPC_256K_PAGES
901 default "4" if PPC32 && PPC_256K_PAGES
905 The kernel page allocator limits the size of maximal physically
906 contiguous allocations. The limit is called MAX_ORDER and it
907 defines the maximal power of two of number of pages that can be
908 allocated as a single contiguous block. This option allows
909 overriding the default setting when ability to allocate very
910 large blocks of physically contiguous memory is required.
912 The page size is not necessarily 4KB. For example, on 64-bit
913 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
914 this in mind when choosing a value for this option.
916 Don't change if unsure.
918 config PPC_SUBPAGE_PROT
919 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
921 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
923 This option adds support for system call to allow user programs
924 to set access permissions (read/write, readonly, or no access)
925 on the 4k subpages of each 64k page.
927 If unsure, say N here.
929 config PPC_PROT_SAO_LPAR
930 bool "Support PROT_SAO mappings in LPARs"
931 depends on PPC_BOOK3S_64
933 This option adds support for PROT_SAO mappings from userspace
934 inside LPARs on supported CPUs.
936 This may cause issues when performing guest migration from
937 a CPU that supports SAO to one that does not.
939 If unsure, say N here.
941 config PPC_COPRO_BASE
945 bool "SMT (Hyperthreading) scheduler support"
946 depends on PPC64 && SMP
948 SMT scheduler support improves the CPU scheduler's decision making
949 when dealing with POWER5 cpus at a cost of slightly increased
950 overhead in some places. If unsure say N here.
952 config PPC_DENORMALISATION
953 bool "PowerPC denormalisation exception handling"
954 depends on PPC_BOOK3S_64
955 default "y" if PPC_POWERNV
957 Add support for handling denormalisation of single precision
958 values. Useful for bare metal only. If unsure say Y here.
961 string "Initial kernel command string"
964 On some platforms, there is currently no way for the boot loader to
965 pass arguments to the kernel. For these platforms, you can supply
966 some command-line options at build time by entering them here. In
967 most cases you will need to specify the root device here.
970 prompt "Kernel command line type" if CMDLINE != ""
971 default CMDLINE_FROM_BOOTLOADER
973 config CMDLINE_FROM_BOOTLOADER
974 bool "Use bootloader kernel arguments if available"
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.
980 config CMDLINE_EXTEND
981 bool "Extend bootloader kernel arguments"
983 The command-line arguments provided by the boot loader will be
984 appended to the default kernel command string.
987 bool "Always use the default kernel command string"
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.
997 string "Additional default image types"
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.
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'.
1007 If unsure, leave blank
1009 config ARCH_WANTS_FREEZER_CONTROL
1013 source "kernel/power/Kconfig"
1016 prompt "PowerPC Memory Protection Keys"
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
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.
1027 For details, see Documentation/core-api/protection-keys.rst
1031 config PPC_SECURE_BOOT
1032 prompt "Enable secure boot support"
1034 depends on PPC_POWERNV || PPC_PSERIES
1035 depends on IMA_ARCH_POLICY
1036 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1037 select PSERIES_PLPKS if PPC_PSERIES
1039 Systems with firmware secure boot enabled need to define security
1040 policies to extend secure boot to the OS. This config allows a user
1041 to enable OS secure boot on systems that have firmware support for
1042 it. If in doubt say N.
1044 config PPC_SECVAR_SYSFS
1045 bool "Enable sysfs interface for POWER secure variables"
1047 depends on PPC_SECURE_BOOT
1050 POWER secure variables are managed and controlled by firmware.
1051 These variables are exposed to userspace via sysfs to enable
1052 read/write operations on these variables. Say Y if you have
1053 secure boot enabled and want to expose variables to userspace.
1064 bool "Support for ISA-bus hardware"
1068 Find out whether you have ISA slots on your motherboard. ISA is the
1069 name of a bus system, i.e. the way the CPU talks to the other stuff
1070 inside your box. If you have an Apple machine, say N here; if you
1071 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1072 embedded board, consult your board documentation.
1074 config GENERIC_ISA_DMA
1076 depends on ISA_DMA_API
1079 config PPC_INDIRECT_PCI
1082 default y if 40x || 44x
1092 select ARCH_HAS_DMA_SET_MASK
1093 select PPC_INDIRECT_PCI
1099 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1101 Freescale MPC85xx/MPC86xx power management controller support
1102 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1107 depends on SUSPEND && (44x || 40x)
1109 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1110 It also enables support for two different idle states (idle-wait
1117 bool "Freescale Local Bus support"
1119 Enables reporting of errors from the Freescale local bus
1120 controller. Also contains some common code used by
1121 drivers for specific local bus peripherals.
1125 depends on PPC_83xx || QUICC_ENGINE || CPM2
1127 Freescale General-purpose Timers support
1131 depends on PCI && 8260
1132 select PPC_INDIRECT_PCI
1136 bool "Freescale Embedded SRIO Controller support"
1137 depends on RAPIDIO = y && HAVE_RAPIDIO
1140 Include support for RapidIO controller on Freescale embedded
1141 processors (MPC8548, MPC8641, etc).
1145 config NONSTATIC_KERNEL
1148 menu "Advanced setup"
1151 config ADVANCED_OPTIONS
1152 bool "Prompt for advanced kernel configuration options"
1154 This option will enable prompting for a variety of advanced kernel
1155 configuration options. These options can cause the kernel to not
1156 work if they are set incorrectly, but can be used to optimize certain
1157 aspects of kernel memory management.
1159 Unless you know what you are doing, say N here.
1161 comment "Default settings for advanced configuration options are used"
1162 depends on !ADVANCED_OPTIONS
1164 config LOWMEM_SIZE_BOOL
1165 bool "Set maximum low memory"
1166 depends on ADVANCED_OPTIONS
1168 This option allows you to set the maximum amount of memory which
1169 will be used as "low memory", that is, memory which the kernel can
1170 access directly, without having to set up a kernel virtual mapping.
1171 This can be useful in optimizing the layout of kernel virtual
1174 Say N here unless you know what you are doing.
1177 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1178 default "0x30000000"
1180 config LOWMEM_CAM_NUM_BOOL
1181 bool "Set number of CAMs to use to map low memory"
1182 depends on ADVANCED_OPTIONS && PPC_85xx
1184 This option allows you to set the maximum number of CAM slots that
1185 will be used to map low memory. There are a limited number of slots
1186 available and even more limited number that will fit in the L1 MMU.
1187 However, using more entries will allow mapping more low memory. This
1188 can be useful in optimizing the layout of kernel virtual memory.
1190 Say N here unless you know what you are doing.
1192 config LOWMEM_CAM_NUM
1194 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1195 default 3 if !STRICT_KERNEL_RWX
1196 default 9 if DATA_SHIFT >= 24
1197 default 12 if DATA_SHIFT >= 22
1200 config DYNAMIC_MEMSTART
1201 bool "Enable page aligned dynamic load address for kernel"
1202 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1203 select NONSTATIC_KERNEL
1205 This option enables the kernel to be loaded at any page aligned
1206 physical address. The kernel creates a mapping from KERNELBASE to
1207 the address where the kernel is loaded. The page size here implies
1208 the TLB page size of the mapping for kernel on the particular platform.
1209 Please refer to the init code for finding the TLB page size.
1211 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1212 kernel image, where the only restriction is the page aligned kernel
1213 load address. When this option is enabled, the compile time physical
1214 address CONFIG_PHYSICAL_START is ignored.
1216 This option is overridden by CONFIG_RELOCATABLE
1218 config PAGE_OFFSET_BOOL
1219 bool "Set custom page offset address"
1220 depends on ADVANCED_OPTIONS
1222 This option allows you to set the kernel virtual address at which
1223 the kernel will map low memory. This can be useful in optimizing
1224 the virtual memory layout of the system.
1226 Say N here unless you know what you are doing.
1229 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1230 default "0xc0000000"
1232 config KERNEL_START_BOOL
1233 bool "Set custom kernel base address"
1234 depends on ADVANCED_OPTIONS
1236 This option allows you to set the kernel virtual address at which
1237 the kernel will be loaded. Normally this should match PAGE_OFFSET
1238 however there are times (like kdump) that one might not want them
1241 Say N here unless you know what you are doing.
1244 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1245 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1246 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1247 default "0xc0000000"
1249 config PHYSICAL_START_BOOL
1250 bool "Set physical address where the kernel is loaded"
1251 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1253 This gives the physical address where the kernel is loaded.
1255 Say N here unless you know what you are doing.
1257 config PHYSICAL_START
1258 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1259 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1260 default "0x00000000"
1262 config PHYSICAL_ALIGN
1264 default "0x04000000" if PPC_85xx
1266 This value puts the alignment restrictions on physical address
1267 where kernel is loaded and run from. Kernel is compiled for an
1268 address which meets above alignment restriction.
1270 config TASK_SIZE_BOOL
1271 bool "Set custom user task size"
1272 depends on ADVANCED_OPTIONS
1274 This option allows you to set the amount of virtual address space
1275 allocated to user tasks. This can be useful in optimizing the
1276 virtual memory layout of the system.
1278 Say N here unless you know what you are doing.
1281 hex "Size of user task space" if TASK_SIZE_BOOL
1282 default "0x80000000" if PPC_8xx
1283 default "0xb0000000" if PPC_BOOK3S_32
1284 default "0xc0000000"
1288 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1291 default "0xc000000000000000"
1294 default "0xc000000000000000"
1295 config PHYSICAL_START
1297 default "0x00000000"
1300 config PPC_LIB_RHEAP
1303 source "arch/powerpc/kvm/Kconfig"
1305 source "kernel/livepatch/Kconfig"