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_MIGHT_HAVE_PC_PARPORT
161 select ARCH_MIGHT_HAVE_PC_SERIO
162 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
163 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
164 select ARCH_SPLIT_ARG64 if PPC32
165 select ARCH_STACKWALK
166 select ARCH_SUPPORTS_ATOMIC_RMW
167 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
168 select ARCH_USE_BUILTIN_BSWAP
169 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
170 select ARCH_USE_MEMTEST
171 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
172 select ARCH_WANT_DEFAULT_BPF_JIT
173 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
174 select ARCH_WANT_IPC_PARSE_VERSION
175 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
176 select ARCH_WANT_LD_ORPHAN_WARN
177 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
178 select ARCH_WEAK_RELEASE_ACQUIRE
180 select BUILDTIME_TABLE_SORT
181 select CLONE_BACKWARDS
182 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
183 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
184 select DMA_OPS_BYPASS if PPC64
185 select DMA_OPS if PPC64
186 select DYNAMIC_FTRACE if FUNCTION_TRACER
187 select EDAC_ATOMIC_SCRUB
189 select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if ARCH_USING_PATCHABLE_FUNCTION_ENTRY
190 select GENERIC_ATOMIC64 if PPC32
191 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
192 select GENERIC_CMOS_UPDATE
193 select GENERIC_CPU_AUTOPROBE
194 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
195 select GENERIC_EARLY_IOREMAP
196 select GENERIC_GETTIMEOFDAY
197 select GENERIC_IDLE_POLL_SETUP
198 select GENERIC_IRQ_SHOW
199 select GENERIC_IRQ_SHOW_LEVEL
200 select GENERIC_PCI_IOMAP if PCI
201 select GENERIC_PTDUMP
202 select GENERIC_SMP_IDLE_THREAD
203 select GENERIC_TIME_VSYSCALL
204 select GENERIC_VDSO_TIME_NS
205 select HAS_IOPORT if PCI
206 select HAVE_ARCH_AUDITSYSCALL
207 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
208 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
209 select HAVE_ARCH_JUMP_LABEL
210 select HAVE_ARCH_JUMP_LABEL_RELATIVE
211 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
212 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
213 select HAVE_ARCH_KASAN if PPC_BOOK3E_64
214 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
215 select HAVE_ARCH_KCSAN
216 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
217 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
218 select HAVE_ARCH_WITHIN_STACK_FRAMES
219 select HAVE_ARCH_KGDB
220 select HAVE_ARCH_MMAP_RND_BITS
221 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
222 select HAVE_ARCH_NVRAM_OPS
223 select HAVE_ARCH_SECCOMP_FILTER
224 select HAVE_ARCH_TRACEHOOK
225 select HAVE_ASM_MODVERSIONS
226 select HAVE_CONTEXT_TRACKING_USER
227 select HAVE_C_RECORDMCOUNT
228 select HAVE_DEBUG_KMEMLEAK
229 select HAVE_DEBUG_STACKOVERFLOW
230 select HAVE_DYNAMIC_FTRACE
231 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
232 select HAVE_DYNAMIC_FTRACE_WITH_REGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
234 select HAVE_EFFICIENT_UNALIGNED_ACCESS
236 select HAVE_FTRACE_MCOUNT_RECORD
237 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
238 select HAVE_FUNCTION_ERROR_INJECTION
239 select HAVE_FUNCTION_GRAPH_TRACER
240 select HAVE_FUNCTION_TRACER if PPC64 || (PPC32 && CC_IS_GCC)
241 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
242 select HAVE_GENERIC_VDSO
243 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
244 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
245 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
246 select HAVE_IOREMAP_PROT
247 select HAVE_IRQ_TIME_ACCOUNTING
248 select HAVE_KERNEL_GZIP
249 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
250 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
251 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
253 select HAVE_KPROBES_ON_FTRACE
254 select HAVE_KRETPROBES
255 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT
256 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
257 select HAVE_MOD_ARCH_SPECIFIC
258 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
259 select HAVE_OPTPROBES
260 select HAVE_OBJTOOL if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
261 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
262 select HAVE_PERF_EVENTS
263 select HAVE_PERF_EVENTS_NMI if PPC64
264 select HAVE_PERF_REGS
265 select HAVE_PERF_USER_STACK_DUMP
266 select HAVE_REGS_AND_STACK_ACCESS_API
267 select HAVE_RELIABLE_STACKTRACE
269 select HAVE_SETUP_PER_CPU_AREA if PPC64
270 select HAVE_SOFTIRQ_ON_OWN_STACK
271 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
272 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
273 select HAVE_STATIC_CALL if PPC32
274 select HAVE_SYSCALL_TRACEPOINTS
275 select HAVE_VIRT_CPU_ACCOUNTING
276 select HAVE_VIRT_CPU_ACCOUNTING_GEN
277 select HOTPLUG_SMT if HOTPLUG_CPU
278 select SMT_NUM_THREADS_DYNAMIC
279 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
280 select IOMMU_HELPER if PPC64
282 select IRQ_FORCED_THREADING
283 select KASAN_VMALLOC if KASAN && MODULES
284 select LOCK_MM_AND_FIND_VMA
285 select MMU_GATHER_PAGE_SIZE
286 select MMU_GATHER_RCU_TABLE_FREE
287 select MMU_GATHER_MERGE_VMAS
288 select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64
289 select MODULES_USE_ELF_RELA
290 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
291 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
292 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
293 select NEED_SG_DMA_LENGTH
295 select OF_EARLY_FLATTREE
296 select OLD_SIGACTION if PPC32
297 select OLD_SIGSUSPEND
298 select PCI_DOMAINS if PCI
299 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
300 select PCI_SYSCALL if PCI
301 select PPC_DAWR if PPC64
304 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
305 select SYSCTL_EXCEPTION_TRACE
306 select THREAD_INFO_IN_TASK
307 select TRACE_IRQFLAGS_SUPPORT
309 # Please keep this list sorted alphabetically.
312 config PPC_BARRIER_NOSPEC
315 depends on PPC_BOOK3S_64 || PPC_E500
317 config PPC_HAS_LBARX_LHARX
329 bool "Enable support for 32bit binaries"
331 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
332 default y if !CPU_LITTLE_ENDIAN
333 select ARCH_WANT_OLD_COMPAT_IPC
334 select COMPAT_OLD_SIGACTION
336 config SCHED_OMIT_FRAME_POINTER
340 config ARCH_MAY_HAVE_PC_FDC
344 config PPC_UDBG_16550
347 config GENERIC_TBSYNC
349 default y if PPC32 && SMP
360 config GENERIC_BUG_RELATIVE_POINTERS
362 depends on GENERIC_BUG
364 config SYS_SUPPORTS_APM_EMULATION
365 default y if PMAC_APM_EMU
371 Used to allow a board to specify it wants an ePAPR compliant wrapper.
373 config DEFAULT_UIMAGE
376 Used to allow a board to specify it wants a uImage built by default
378 config ARCH_HIBERNATION_POSSIBLE
382 config ARCH_SUSPEND_POSSIBLE
384 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
385 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
388 config ARCH_SUSPEND_NONZERO_CPU
390 depends on PPC_POWERNV || PPC_PSERIES
392 config ARCH_HAS_ADD_PAGES
394 depends on ARCH_ENABLE_MEMORY_HOTPLUG
396 config PPC_DCR_NATIVE
404 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
407 config PPC_PCI_OF_BUS_MAP
408 bool "Use pci_to_OF_bus_map (deprecated)"
410 depends on PPC_PMAC || PPC_CHRP
412 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which
413 restricts the system to only having 256 PCI buses. On CHRP it also causes
414 the "pci-OF-bus-map" property to be created in the device tree.
418 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
420 depends on !PPC_PCI_OF_BUS_MAP
421 bool "Assign PCI bus numbers from zero individually for each PCI domain"
424 By default on PPC32 were PCI bus numbers unique across all PCI domains.
425 So system could have only 256 PCI buses independently of available
426 PCI domains. When this option is enabled then PCI bus numbers are
427 PCI domain dependent and each PCI controller on own domain can have
428 256 PCI buses, like it is on other Linux architectures.
430 config PPC_OF_PLATFORM_PCI
433 depends on PPC64 # not supported on 32 bits yet
435 config ARCH_SUPPORTS_UPROBES
438 config PPC_ADV_DEBUG_REGS
440 depends on 40x || BOOKE
443 config PPC_ADV_DEBUG_IACS
445 depends on PPC_ADV_DEBUG_REGS
449 config PPC_ADV_DEBUG_DACS
451 depends on PPC_ADV_DEBUG_REGS
454 config PPC_ADV_DEBUG_DVCS
456 depends on PPC_ADV_DEBUG_REGS
460 config PPC_ADV_DEBUG_DAC_RANGE
462 depends on PPC_ADV_DEBUG_REGS && 44x
468 config PGTABLE_LEVELS
473 source "arch/powerpc/sysdev/Kconfig"
474 source "arch/powerpc/platforms/Kconfig"
476 menu "Kernel options"
479 bool "High memory support"
483 source "kernel/Kconfig.hz"
485 config MATH_EMULATION
486 bool "Math emulation"
487 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
490 Some PowerPC chips designed for embedded applications do not have
491 a floating-point unit and therefore do not implement the
492 floating-point instructions in the PowerPC instruction set. If you
493 say Y here, the kernel will include code to emulate a floating-point
494 unit, which will allow programs that use floating-point
497 This is also useful to emulate missing (optional) instructions
498 such as fsqrt on cores that do have an FPU but do not implement
499 them (such as Freescale BookE).
502 prompt "Math emulation options"
503 default MATH_EMULATION_FULL
504 depends on MATH_EMULATION
506 config MATH_EMULATION_FULL
507 bool "Emulate all the floating point instructions"
509 Select this option will enable the kernel to support to emulate
510 all the floating point instructions. If your SoC doesn't have
511 a FPU, you should select this.
513 config MATH_EMULATION_HW_UNIMPLEMENTED
514 bool "Just emulate the FPU unimplemented instructions"
516 Select this if you know there does have a hardware FPU on your
517 SoC, but some floating point instructions are not implemented by that.
521 config PPC_TRANSACTIONAL_MEM
522 bool "Transactional Memory support for POWERPC"
523 depends on PPC_BOOK3S_64
528 Support user-mode Transactional Memory on POWERPC.
531 bool "Ultravisor support"
532 depends on KVM_BOOK3S_HV_POSSIBLE
533 depends on DEVICE_PRIVATE
536 This option paravirtualizes the kernel to run in POWER platforms that
537 supports the Protected Execution Facility (PEF). On such platforms,
538 the ultravisor firmware runs at a privilege level above the
543 config LD_HEAD_STUB_CATCH
544 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
547 Very large kernels can cause linker branch stubs to be generated by
548 code in head_64.S, which moves the head text sections out of their
549 specified location. This option can work around the problem.
553 config MPROFILE_KERNEL
554 depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER
555 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN
556 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN
558 config ARCH_USING_PATCHABLE_FUNCTION_ENTRY
559 depends on FUNCTION_TRACER && (PPC32 || PPC64_ELF_ABI_V2)
560 depends on $(cc-option,-fpatchable-function-entry=2)
562 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN
563 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN
566 bool "Support for enabling/disabling CPUs"
567 depends on SMP && (PPC_PSERIES || \
568 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
570 Say Y here to be able to disable and re-enable individual
571 CPUs at runtime on SMP machines.
573 Say N if you are unsure.
575 config INTERRUPT_SANITIZE_REGISTERS
576 bool "Clear gprs on interrupt arrival"
577 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
578 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
580 Reduce the influence of user register state on interrupt handlers and
581 syscalls through clearing user state from registers before handling
584 config PPC_QUEUED_SPINLOCKS
585 bool "Queued spinlocks" if EXPERT
587 default PPC_BOOK3S_64
589 Say Y here to use queued spinlocks which give better scalability and
590 fairness on large SMP and NUMA systems without harming single threaded
593 config ARCH_CPU_PROBE_RELEASE
595 depends on HOTPLUG_CPU
597 config PPC64_SUPPORTS_MEMORY_FAILURE
598 bool "Add support for memory hwpoison"
599 depends on PPC_BOOK3S_64
600 default "y" if PPC_POWERNV
601 select ARCH_SUPPORTS_MEMORY_FAILURE
604 bool "kexec system call"
605 depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP)
608 kexec is a system call that implements the ability to shutdown your
609 current kernel, and to start another kernel. It is like a reboot
610 but it is independent of the system firmware. And like a reboot
611 you can start any kernel with it, not just Linux.
613 The name comes from the similarity to the exec system call.
615 It is an ongoing process to be certain the hardware in a machine
616 is properly shutdown, so do not be surprised if this code does not
617 initially work for you. As of this writing the exact hardware
618 interface is strongly in flux, so no good recommendation can be
622 bool "kexec file based system call"
624 select HAVE_IMA_KEXEC if IMA
628 depends on CRYPTO_SHA256=y
630 This is a new version of the kexec system call. This call is
631 file based and takes in file descriptors as system call arguments
632 for kernel and initramfs as opposed to a list of segments as is the
633 case for the older kexec call.
635 config ARCH_HAS_KEXEC_PURGATORY
638 config PPC64_BIG_ENDIAN_ELF_ABI_V2
639 # Option is available to BFD, but LLD does not support ELFv1 so this is
641 prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT
643 depends on PPC64 && CPU_BIG_ENDIAN
644 depends on CC_HAS_ELFV2
646 This builds the kernel image using the "Power Architecture 64-Bit ELF
647 V2 ABI Specification", which has a reduced stack overhead and faster
648 function calls. This internal kernel ABI option does not affect
649 userspace compatibility.
651 The V2 ABI is standard for 64-bit little-endian, but for big-endian
652 it is less well tested by kernel and toolchain. However some distros
653 build userspace this way, and it can produce a functioning kernel.
656 bool "Build a relocatable kernel"
657 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
658 select NONSTATIC_KERNEL
660 This builds a kernel image that is capable of running at the
661 location the kernel is loaded at. For ppc32, there is no any
662 alignment restrictions, and this feature is a superset of
663 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
664 16k-aligned base address. The kernel is linked as a
665 position-independent executable (PIE) and contains dynamic relocations
666 which are processed early in the bootup process.
668 One use is for the kexec on panic case where the recovery kernel
669 must live at a different physical address than the primary
672 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
673 it has been loaded at and the compile time physical addresses
674 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
675 setting can still be useful to bootwrappers that need to know the
676 load address of the kernel (eg. u-boot/mkimage).
678 config RANDOMIZE_BASE
679 bool "Randomize the address of the kernel image"
680 depends on PPC_85xx && FLATMEM
681 depends on RELOCATABLE
683 Randomizes the virtual address at which the kernel image is
684 loaded, as a security feature that deters exploit attempts
685 relying on knowledge of the location of kernel internals.
689 config RELOCATABLE_TEST
690 bool "Test relocatable kernel"
691 depends on (PPC64 && RELOCATABLE)
693 This runs the relocatable kernel at the address it was initially
694 loaded at, which tends to be non-zero and therefore test the
698 bool "Build a dump capture kernel"
699 depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
700 select RELOCATABLE if PPC64 || 44x || PPC_85xx
702 Build a kernel suitable for use as a dump capture kernel.
703 The same kernel binary can be used as production kernel and dump
707 bool "Firmware-assisted dump"
708 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
712 A robust mechanism to get reliable kernel crash dump with
713 assistance from firmware. This approach does not use kexec,
714 instead firmware assists in booting the capture kernel
715 while preserving memory contents. Firmware-assisted dump
716 is meant to be a kdump replacement offering robustness and
717 speed not possible without system firmware assistance.
719 If unsure, say "y". Only special kernels like petitboot may
720 need to say "N" here.
722 config PRESERVE_FA_DUMP
723 bool "Preserve Firmware-assisted dump"
724 depends on PPC64 && PPC_POWERNV && !FA_DUMP
726 On a kernel with FA_DUMP disabled, this option helps to preserve
727 crash data from a previously crash'ed kernel. Useful when the next
728 memory preserving kernel boot would process this crash data.
729 Petitboot kernel is the typical usecase for this option.
732 bool "Export OPAL memory as /sys/firmware/opal/core"
733 depends on PPC64 && PPC_POWERNV
735 This option uses the MPIPL support in firmware to provide an
736 ELF core of OPAL memory after a crash. The ELF core is exported
737 as /sys/firmware/opal/core file which is helpful in debugging
738 OPAL crashes using GDB.
741 bool "Distribute interrupts on all CPUs by default"
744 This option gives the kernel permission to distribute IRQs across
745 multiple CPUs. Saying N here will route all IRQs to the first
746 CPU. Generally saying Y is safe, although some problems have been
747 reported with SMP Power Macintoshes with this option enabled.
750 bool "NUMA Memory Allocation and Scheduler Support"
751 depends on PPC64 && SMP
752 default y if PPC_PSERIES || PPC_POWERNV
753 select USE_PERCPU_NUMA_NODE_ID
755 Enable NUMA (Non-Uniform Memory Access) support.
757 The kernel will try to allocate memory used by a CPU on the
758 local memory controller of the CPU and add some more
759 NUMA awareness to the kernel.
767 config HAVE_MEMORYLESS_NODES
771 config ARCH_SELECT_MEMORY_MODEL
775 config ARCH_FLATMEM_ENABLE
777 depends on (PPC64 && !NUMA) || PPC32
779 config ARCH_SPARSEMEM_ENABLE
782 select SPARSEMEM_VMEMMAP_ENABLE
784 config ARCH_SPARSEMEM_DEFAULT
786 depends on PPC_BOOK3S_64
788 config ILLEGAL_POINTER_VALUE
790 # This is roughly half way between the top of user space and the bottom
791 # of kernel space, which seems about as good as we can get.
792 default 0x5deadbeef0000000 if PPC64
795 config ARCH_MEMORY_PROBE
797 depends on MEMORY_HOTPLUG
801 default PPC_64K_PAGES if PPC_BOOK3S_64
804 Select the kernel logical page size. Increasing the page size
805 will reduce software overhead at each page boundary, allow
806 hardware prefetch mechanisms to be more effective, and allow
807 larger dma transfers increasing IO efficiency and reducing
808 overhead. However the utilization of memory will increase.
809 For example, each cached file will using a multiple of the
810 page size to hold its contents and the difference between the
811 end of file and the end of page is wasted.
813 Some dedicated systems, such as software raid serving with
814 accelerated calculations, have shown significant increases.
816 If you configure a 64 bit kernel for 64k pages but the
817 processor does not support them, then the kernel will simulate
818 them with 4k pages, loading them on demand, but with the
819 reduced software overhead and larger internal fragmentation.
820 For the 32 bit kernel, a large page option will not be offered
821 unless it is supported by the configured processor.
823 If unsure, choose 4K_PAGES.
827 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
831 depends on 44x || PPC_8xx
835 depends on 44x || PPC_BOOK3S_64
836 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
838 config PPC_256K_PAGES
839 bool "256k page size (Requires non-standard binutils settings)"
840 depends on 44x && !PPC_47x
842 Make the page size 256k.
844 The kernel will only be able to run applications that have been
845 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
846 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
847 definition from 0x10000 to 0x40000 in older versions.
853 depends on PPC_4K_PAGES
855 config PAGE_SIZE_16KB
857 depends on PPC_16K_PAGES
859 config PAGE_SIZE_64KB
861 depends on PPC_64K_PAGES
863 config PAGE_SIZE_256KB
865 depends on PPC_256K_PAGES
867 config PPC_PAGE_SHIFT
869 default 18 if PPC_256K_PAGES
870 default 16 if PPC_64K_PAGES
871 default 14 if PPC_16K_PAGES
875 int "Thread shift" if EXPERT
877 default "15" if PPC_256K_PAGES
878 default "14" if PPC64
881 Used to define the stack size. The default is almost always what you
882 want. Only change this if you know what you are doing.
884 config DATA_SHIFT_BOOL
885 bool "Set custom data alignment"
886 depends on ADVANCED_OPTIONS
887 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
888 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
891 This option allows you to set the kernel data alignment. When
892 RAM is mapped by blocks, the alignment needs to fit the size and
893 number of possible blocks. The default should be OK for most configs.
895 Say N here unless you know what you are doing.
898 int "Data shift" if DATA_SHIFT_BOOL
899 default 24 if STRICT_KERNEL_RWX && PPC64
900 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
901 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
902 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
903 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
904 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
905 default 23 if STRICT_KERNEL_RWX && PPC_8xx
906 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
907 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
908 default 24 if STRICT_KERNEL_RWX && PPC_85xx
909 default PPC_PAGE_SHIFT
911 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
912 Smaller is the alignment, greater is the number of necessary DBATs.
914 On 8xx, large pages (512kb or 8M) are used to map kernel linear
915 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
916 in that case. If PIN_TLB is selected, it must be aligned to 8M as
917 8M pages will be pinned.
919 config ARCH_FORCE_MAX_ORDER
920 int "Order of maximal physically contiguous allocations"
921 range 7 8 if PPC64 && PPC_64K_PAGES
922 default "8" if PPC64 && PPC_64K_PAGES
923 range 12 12 if PPC64 && !PPC_64K_PAGES
924 default "12" if PPC64 && !PPC_64K_PAGES
925 range 8 10 if PPC32 && PPC_16K_PAGES
926 default "8" if PPC32 && PPC_16K_PAGES
927 range 6 10 if PPC32 && PPC_64K_PAGES
928 default "6" if PPC32 && PPC_64K_PAGES
929 range 4 10 if PPC32 && PPC_256K_PAGES
930 default "4" if PPC32 && PPC_256K_PAGES
934 The kernel page allocator limits the size of maximal physically
935 contiguous allocations. The limit is called MAX_ORDER and it
936 defines the maximal power of two of number of pages that can be
937 allocated as a single contiguous block. This option allows
938 overriding the default setting when ability to allocate very
939 large blocks of physically contiguous memory is required.
941 The page size is not necessarily 4KB. For example, on 64-bit
942 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
943 this in mind when choosing a value for this option.
945 Don't change if unsure.
947 config PPC_SUBPAGE_PROT
948 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
950 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
952 This option adds support for system call to allow user programs
953 to set access permissions (read/write, readonly, or no access)
954 on the 4k subpages of each 64k page.
956 If unsure, say N here.
958 config PPC_PROT_SAO_LPAR
959 bool "Support PROT_SAO mappings in LPARs"
960 depends on PPC_BOOK3S_64
962 This option adds support for PROT_SAO mappings from userspace
963 inside LPARs on supported CPUs.
965 This may cause issues when performing guest migration from
966 a CPU that supports SAO to one that does not.
968 If unsure, say N here.
970 config PPC_COPRO_BASE
974 bool "SMT (Hyperthreading) scheduler support"
975 depends on PPC64 && SMP
977 SMT scheduler support improves the CPU scheduler's decision making
978 when dealing with POWER5 cpus at a cost of slightly increased
979 overhead in some places. If unsure say N here.
981 config PPC_DENORMALISATION
982 bool "PowerPC denormalisation exception handling"
983 depends on PPC_BOOK3S_64
984 default "y" if PPC_POWERNV
986 Add support for handling denormalisation of single precision
987 values. Useful for bare metal only. If unsure say Y here.
990 string "Initial kernel command string"
993 On some platforms, there is currently no way for the boot loader to
994 pass arguments to the kernel. For these platforms, you can supply
995 some command-line options at build time by entering them here. In
996 most cases you will need to specify the root device here.
999 prompt "Kernel command line type" if CMDLINE != ""
1000 default CMDLINE_FROM_BOOTLOADER
1002 config CMDLINE_FROM_BOOTLOADER
1003 bool "Use bootloader kernel arguments if available"
1005 Uses the command-line options passed by the boot loader. If
1006 the boot loader doesn't provide any, the default kernel command
1007 string provided in CMDLINE will be used.
1009 config CMDLINE_EXTEND
1010 bool "Extend bootloader kernel arguments"
1012 The command-line arguments provided by the boot loader will be
1013 appended to the default kernel command string.
1015 config CMDLINE_FORCE
1016 bool "Always use the default kernel command string"
1018 Always use the default kernel command string, even if the boot
1019 loader passes other arguments to the kernel.
1020 This is useful if you cannot or don't want to change the
1021 command-line options your boot loader passes to the kernel.
1025 config EXTRA_TARGETS
1026 string "Additional default image types"
1028 List additional targets to be built by the bootwrapper here (separated
1029 by spaces). This is useful for targets that depend of device tree
1030 files in the .dts directory.
1032 Targets in this list will be build as part of the default build
1033 target, or when the user does a 'make zImage' or a
1034 'make zImage.initrd'.
1036 If unsure, leave blank
1038 config ARCH_WANTS_FREEZER_CONTROL
1042 source "kernel/power/Kconfig"
1045 prompt "PowerPC Memory Protection Keys"
1047 depends on PPC_BOOK3S_64
1048 depends on PPC_64S_HASH_MMU
1049 select ARCH_USES_HIGH_VMA_FLAGS
1050 select ARCH_HAS_PKEYS
1052 Memory Protection Keys provides a mechanism for enforcing
1053 page-based protections, but without requiring modification of the
1054 page tables when an application changes protection domains.
1056 For details, see Documentation/core-api/protection-keys.rst
1060 config PPC_SECURE_BOOT
1061 prompt "Enable secure boot support"
1063 depends on PPC_POWERNV || PPC_PSERIES
1064 depends on IMA_ARCH_POLICY
1065 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1066 select PSERIES_PLPKS if PPC_PSERIES
1068 Systems with firmware secure boot enabled need to define security
1069 policies to extend secure boot to the OS. This config allows a user
1070 to enable OS secure boot on systems that have firmware support for
1071 it. If in doubt say N.
1073 config PPC_SECVAR_SYSFS
1074 bool "Enable sysfs interface for POWER secure variables"
1076 depends on PPC_SECURE_BOOT
1079 POWER secure variables are managed and controlled by firmware.
1080 These variables are exposed to userspace via sysfs to enable
1081 read/write operations on these variables. Say Y if you have
1082 secure boot enabled and want to expose variables to userspace.
1093 bool "Support for ISA-bus hardware"
1097 Find out whether you have ISA slots on your motherboard. ISA is the
1098 name of a bus system, i.e. the way the CPU talks to the other stuff
1099 inside your box. If you have an Apple machine, say N here; if you
1100 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1101 embedded board, consult your board documentation.
1103 config GENERIC_ISA_DMA
1105 depends on ISA_DMA_API
1108 config PPC_INDIRECT_PCI
1111 default y if 40x || 44x
1121 select ARCH_HAS_DMA_SET_MASK
1122 select PPC_INDIRECT_PCI
1128 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1130 Freescale MPC85xx/MPC86xx power management controller support
1131 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1136 depends on SUSPEND && (44x || 40x)
1138 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1139 It also enables support for two different idle states (idle-wait
1146 bool "Freescale Local Bus support"
1148 Enables reporting of errors from the Freescale local bus
1149 controller. Also contains some common code used by
1150 drivers for specific local bus peripherals.
1154 depends on PPC_83xx || QUICC_ENGINE || CPM2
1156 Freescale General-purpose Timers support
1159 bool "Freescale Embedded SRIO Controller support"
1160 depends on RAPIDIO = y && HAVE_RAPIDIO
1163 Include support for RapidIO controller on Freescale embedded
1164 processors (MPC8548, MPC8641, etc).
1168 config NONSTATIC_KERNEL
1171 menu "Advanced setup"
1174 config ADVANCED_OPTIONS
1175 bool "Prompt for advanced kernel configuration options"
1177 This option will enable prompting for a variety of advanced kernel
1178 configuration options. These options can cause the kernel to not
1179 work if they are set incorrectly, but can be used to optimize certain
1180 aspects of kernel memory management.
1182 Unless you know what you are doing, say N here.
1184 comment "Default settings for advanced configuration options are used"
1185 depends on !ADVANCED_OPTIONS
1187 config LOWMEM_SIZE_BOOL
1188 bool "Set maximum low memory"
1189 depends on ADVANCED_OPTIONS
1191 This option allows you to set the maximum amount of memory which
1192 will be used as "low memory", that is, memory which the kernel can
1193 access directly, without having to set up a kernel virtual mapping.
1194 This can be useful in optimizing the layout of kernel virtual
1197 Say N here unless you know what you are doing.
1200 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1201 default "0x30000000"
1203 config LOWMEM_CAM_NUM_BOOL
1204 bool "Set number of CAMs to use to map low memory"
1205 depends on ADVANCED_OPTIONS && PPC_85xx
1207 This option allows you to set the maximum number of CAM slots that
1208 will be used to map low memory. There are a limited number of slots
1209 available and even more limited number that will fit in the L1 MMU.
1210 However, using more entries will allow mapping more low memory. This
1211 can be useful in optimizing the layout of kernel virtual memory.
1213 Say N here unless you know what you are doing.
1215 config LOWMEM_CAM_NUM
1217 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1218 default 3 if !STRICT_KERNEL_RWX
1219 default 9 if DATA_SHIFT >= 24
1220 default 12 if DATA_SHIFT >= 22
1223 config DYNAMIC_MEMSTART
1224 bool "Enable page aligned dynamic load address for kernel"
1225 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1226 select NONSTATIC_KERNEL
1228 This option enables the kernel to be loaded at any page aligned
1229 physical address. The kernel creates a mapping from KERNELBASE to
1230 the address where the kernel is loaded. The page size here implies
1231 the TLB page size of the mapping for kernel on the particular platform.
1232 Please refer to the init code for finding the TLB page size.
1234 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1235 kernel image, where the only restriction is the page aligned kernel
1236 load address. When this option is enabled, the compile time physical
1237 address CONFIG_PHYSICAL_START is ignored.
1239 This option is overridden by CONFIG_RELOCATABLE
1241 config PAGE_OFFSET_BOOL
1242 bool "Set custom page offset address"
1243 depends on ADVANCED_OPTIONS
1245 This option allows you to set the kernel virtual address at which
1246 the kernel will map low memory. This can be useful in optimizing
1247 the virtual memory layout of the system.
1249 Say N here unless you know what you are doing.
1252 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1253 default "0xc0000000"
1255 config KERNEL_START_BOOL
1256 bool "Set custom kernel base address"
1257 depends on ADVANCED_OPTIONS
1259 This option allows you to set the kernel virtual address at which
1260 the kernel will be loaded. Normally this should match PAGE_OFFSET
1261 however there are times (like kdump) that one might not want them
1264 Say N here unless you know what you are doing.
1267 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1268 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1269 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1270 default "0xc0000000"
1272 config PHYSICAL_START_BOOL
1273 bool "Set physical address where the kernel is loaded"
1274 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1276 This gives the physical address where the kernel is loaded.
1278 Say N here unless you know what you are doing.
1280 config PHYSICAL_START
1281 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1282 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1283 default "0x00000000"
1285 config PHYSICAL_ALIGN
1287 default "0x04000000" if PPC_85xx
1289 This value puts the alignment restrictions on physical address
1290 where kernel is loaded and run from. Kernel is compiled for an
1291 address which meets above alignment restriction.
1293 config TASK_SIZE_BOOL
1294 bool "Set custom user task size"
1295 depends on ADVANCED_OPTIONS
1297 This option allows you to set the amount of virtual address space
1298 allocated to user tasks. This can be useful in optimizing the
1299 virtual memory layout of the system.
1301 Say N here unless you know what you are doing.
1304 hex "Size of user task space" if TASK_SIZE_BOOL
1305 default "0x80000000" if PPC_8xx
1306 default "0xb0000000" if PPC_BOOK3S_32
1307 default "0xc0000000"
1311 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1314 default "0xc000000000000000"
1317 default "0xc000000000000000"
1318 config PHYSICAL_START
1320 default "0x00000000"
1323 config PPC_LIB_RHEAP
1326 source "arch/powerpc/kvm/Kconfig"
1328 source "kernel/livepatch/Kconfig"