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 GENERIC_ATOMIC64 if PPC32
190 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
191 select GENERIC_CMOS_UPDATE
192 select GENERIC_CPU_AUTOPROBE
193 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
194 select GENERIC_EARLY_IOREMAP
195 select GENERIC_GETTIMEOFDAY
196 select GENERIC_IRQ_SHOW
197 select GENERIC_IRQ_SHOW_LEVEL
198 select GENERIC_PCI_IOMAP if PCI
199 select GENERIC_PTDUMP
200 select GENERIC_SMP_IDLE_THREAD
201 select GENERIC_TIME_VSYSCALL
202 select GENERIC_VDSO_TIME_NS
203 select HAS_IOPORT if PCI
204 select HAVE_ARCH_AUDITSYSCALL
205 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
206 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
207 select HAVE_ARCH_JUMP_LABEL
208 select HAVE_ARCH_JUMP_LABEL_RELATIVE
209 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
210 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
211 select HAVE_ARCH_KASAN if PPC_BOOK3E_64
212 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
213 select HAVE_ARCH_KCSAN
214 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
215 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
216 select HAVE_ARCH_WITHIN_STACK_FRAMES
217 select HAVE_ARCH_KGDB
218 select HAVE_ARCH_MMAP_RND_BITS
219 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
220 select HAVE_ARCH_NVRAM_OPS
221 select HAVE_ARCH_SECCOMP_FILTER
222 select HAVE_ARCH_TRACEHOOK
223 select HAVE_ASM_MODVERSIONS
224 select HAVE_CONTEXT_TRACKING_USER
225 select HAVE_C_RECORDMCOUNT
226 select HAVE_DEBUG_KMEMLEAK
227 select HAVE_DEBUG_STACKOVERFLOW
228 select HAVE_DYNAMIC_FTRACE
229 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
230 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
232 select HAVE_EFFICIENT_UNALIGNED_ACCESS
234 select HAVE_FTRACE_MCOUNT_RECORD
235 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
236 select HAVE_FUNCTION_ERROR_INJECTION
237 select HAVE_FUNCTION_GRAPH_TRACER
238 select HAVE_FUNCTION_TRACER if PPC64 || (PPC32 && CC_IS_GCC)
239 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
240 select HAVE_GENERIC_VDSO
241 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
242 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
243 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
244 select HAVE_IOREMAP_PROT
245 select HAVE_IRQ_TIME_ACCOUNTING
246 select HAVE_KERNEL_GZIP
247 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
248 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
249 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
251 select HAVE_KPROBES_ON_FTRACE
252 select HAVE_KRETPROBES
253 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT
254 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
255 select HAVE_MOD_ARCH_SPECIFIC
256 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
257 select HAVE_OPTPROBES
258 select HAVE_OBJTOOL if PPC32 || MPROFILE_KERNEL
259 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
260 select HAVE_PERF_EVENTS
261 select HAVE_PERF_EVENTS_NMI if PPC64
262 select HAVE_PERF_REGS
263 select HAVE_PERF_USER_STACK_DUMP
264 select HAVE_REGS_AND_STACK_ACCESS_API
265 select HAVE_RELIABLE_STACKTRACE
267 select HAVE_SETUP_PER_CPU_AREA if PPC64
268 select HAVE_SOFTIRQ_ON_OWN_STACK
269 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
270 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
271 select HAVE_STATIC_CALL if PPC32
272 select HAVE_SYSCALL_TRACEPOINTS
273 select HAVE_VIRT_CPU_ACCOUNTING
274 select HAVE_VIRT_CPU_ACCOUNTING_GEN
275 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
276 select IOMMU_HELPER if PPC64
278 select IRQ_FORCED_THREADING
279 select KASAN_VMALLOC if KASAN && MODULES
280 select LOCK_MM_AND_FIND_VMA
281 select MMU_GATHER_PAGE_SIZE
282 select MMU_GATHER_RCU_TABLE_FREE
283 select MMU_GATHER_MERGE_VMAS
284 select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64
285 select MODULES_USE_ELF_RELA
286 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
287 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
288 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
289 select NEED_SG_DMA_LENGTH
291 select OF_EARLY_FLATTREE
292 select OLD_SIGACTION if PPC32
293 select OLD_SIGSUSPEND
294 select PCI_DOMAINS if PCI
295 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
296 select PCI_SYSCALL if PCI
297 select PPC_DAWR if PPC64
300 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
301 select SYSCTL_EXCEPTION_TRACE
302 select THREAD_INFO_IN_TASK
303 select TRACE_IRQFLAGS_SUPPORT
305 # Please keep this list sorted alphabetically.
308 config PPC_BARRIER_NOSPEC
311 depends on PPC_BOOK3S_64 || PPC_E500
313 config PPC_HAS_LBARX_LHARX
325 bool "Enable support for 32bit binaries"
327 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
328 default y if !CPU_LITTLE_ENDIAN
329 select ARCH_WANT_OLD_COMPAT_IPC
330 select COMPAT_OLD_SIGACTION
332 config SCHED_OMIT_FRAME_POINTER
336 config ARCH_MAY_HAVE_PC_FDC
340 config PPC_UDBG_16550
343 config GENERIC_TBSYNC
345 default y if PPC32 && SMP
356 config GENERIC_BUG_RELATIVE_POINTERS
358 depends on GENERIC_BUG
360 config SYS_SUPPORTS_APM_EMULATION
361 default y if PMAC_APM_EMU
367 Used to allow a board to specify it wants an ePAPR compliant wrapper.
369 config DEFAULT_UIMAGE
372 Used to allow a board to specify it wants a uImage built by default
374 config ARCH_HIBERNATION_POSSIBLE
378 config ARCH_SUSPEND_POSSIBLE
380 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
381 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
384 config ARCH_SUSPEND_NONZERO_CPU
386 depends on PPC_POWERNV || PPC_PSERIES
388 config ARCH_HAS_ADD_PAGES
390 depends on ARCH_ENABLE_MEMORY_HOTPLUG
392 config PPC_DCR_NATIVE
400 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
403 config PPC_PCI_OF_BUS_MAP
404 bool "Use pci_to_OF_bus_map (deprecated)"
406 depends on PPC_PMAC || PPC_CHRP
408 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which
409 restricts the system to only having 256 PCI buses. On CHRP it also causes
410 the "pci-OF-bus-map" property to be created in the device tree.
414 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
416 depends on !PPC_PCI_OF_BUS_MAP
417 bool "Assign PCI bus numbers from zero individually for each PCI domain"
420 By default on PPC32 were PCI bus numbers unique across all PCI domains.
421 So system could have only 256 PCI buses independently of available
422 PCI domains. When this option is enabled then PCI bus numbers are
423 PCI domain dependent and each PCI controller on own domain can have
424 256 PCI buses, like it is on other Linux architectures.
426 config PPC_OF_PLATFORM_PCI
429 depends on PPC64 # not supported on 32 bits yet
431 config ARCH_SUPPORTS_UPROBES
434 config PPC_ADV_DEBUG_REGS
436 depends on 40x || BOOKE
439 config PPC_ADV_DEBUG_IACS
441 depends on PPC_ADV_DEBUG_REGS
445 config PPC_ADV_DEBUG_DACS
447 depends on PPC_ADV_DEBUG_REGS
450 config PPC_ADV_DEBUG_DVCS
452 depends on PPC_ADV_DEBUG_REGS
456 config PPC_ADV_DEBUG_DAC_RANGE
458 depends on PPC_ADV_DEBUG_REGS && 44x
464 config PGTABLE_LEVELS
469 source "arch/powerpc/sysdev/Kconfig"
470 source "arch/powerpc/platforms/Kconfig"
472 menu "Kernel options"
475 bool "High memory support"
479 source "kernel/Kconfig.hz"
481 config MATH_EMULATION
482 bool "Math emulation"
483 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
486 Some PowerPC chips designed for embedded applications do not have
487 a floating-point unit and therefore do not implement the
488 floating-point instructions in the PowerPC instruction set. If you
489 say Y here, the kernel will include code to emulate a floating-point
490 unit, which will allow programs that use floating-point
493 This is also useful to emulate missing (optional) instructions
494 such as fsqrt on cores that do have an FPU but do not implement
495 them (such as Freescale BookE).
498 prompt "Math emulation options"
499 default MATH_EMULATION_FULL
500 depends on MATH_EMULATION
502 config MATH_EMULATION_FULL
503 bool "Emulate all the floating point instructions"
505 Select this option will enable the kernel to support to emulate
506 all the floating point instructions. If your SoC doesn't have
507 a FPU, you should select this.
509 config MATH_EMULATION_HW_UNIMPLEMENTED
510 bool "Just emulate the FPU unimplemented instructions"
512 Select this if you know there does have a hardware FPU on your
513 SoC, but some floating point instructions are not implemented by that.
517 config PPC_TRANSACTIONAL_MEM
518 bool "Transactional Memory support for POWERPC"
519 depends on PPC_BOOK3S_64
524 Support user-mode Transactional Memory on POWERPC.
527 bool "Ultravisor support"
528 depends on KVM_BOOK3S_HV_POSSIBLE
529 depends on DEVICE_PRIVATE
532 This option paravirtualizes the kernel to run in POWER platforms that
533 supports the Protected Execution Facility (PEF). On such platforms,
534 the ultravisor firmware runs at a privilege level above the
539 config LD_HEAD_STUB_CATCH
540 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
543 Very large kernels can cause linker branch stubs to be generated by
544 code in head_64.S, which moves the head text sections out of their
545 specified location. This option can work around the problem.
549 config MPROFILE_KERNEL
550 depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER
551 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN
552 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN
555 bool "Support for enabling/disabling CPUs"
556 depends on SMP && (PPC_PSERIES || \
557 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
559 Say Y here to be able to disable and re-enable individual
560 CPUs at runtime on SMP machines.
562 Say N if you are unsure.
564 config INTERRUPT_SANITIZE_REGISTERS
565 bool "Clear gprs on interrupt arrival"
566 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
567 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
569 Reduce the influence of user register state on interrupt handlers and
570 syscalls through clearing user state from registers before handling
573 config PPC_QUEUED_SPINLOCKS
574 bool "Queued spinlocks" if EXPERT
576 default PPC_BOOK3S_64
578 Say Y here to use queued spinlocks which give better scalability and
579 fairness on large SMP and NUMA systems without harming single threaded
582 config ARCH_CPU_PROBE_RELEASE
584 depends on HOTPLUG_CPU
586 config PPC64_SUPPORTS_MEMORY_FAILURE
587 bool "Add support for memory hwpoison"
588 depends on PPC_BOOK3S_64
589 default "y" if PPC_POWERNV
590 select ARCH_SUPPORTS_MEMORY_FAILURE
593 bool "kexec system call"
594 depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP)
597 kexec is a system call that implements the ability to shutdown your
598 current kernel, and to start another kernel. It is like a reboot
599 but it is independent of the system firmware. And like a reboot
600 you can start any kernel with it, not just Linux.
602 The name comes from the similarity to the exec system call.
604 It is an ongoing process to be certain the hardware in a machine
605 is properly shutdown, so do not be surprised if this code does not
606 initially work for you. As of this writing the exact hardware
607 interface is strongly in flux, so no good recommendation can be
611 bool "kexec file based system call"
613 select HAVE_IMA_KEXEC if IMA
617 depends on CRYPTO_SHA256=y
619 This is a new version of the kexec system call. This call is
620 file based and takes in file descriptors as system call arguments
621 for kernel and initramfs as opposed to a list of segments as is the
622 case for the older kexec call.
624 config ARCH_HAS_KEXEC_PURGATORY
627 config PPC64_BIG_ENDIAN_ELF_ABI_V2
628 # Option is available to BFD, but LLD does not support ELFv1 so this is
630 prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT
632 depends on PPC64 && CPU_BIG_ENDIAN
633 depends on CC_HAS_ELFV2
635 This builds the kernel image using the "Power Architecture 64-Bit ELF
636 V2 ABI Specification", which has a reduced stack overhead and faster
637 function calls. This internal kernel ABI option does not affect
638 userspace compatibility.
640 The V2 ABI is standard for 64-bit little-endian, but for big-endian
641 it is less well tested by kernel and toolchain. However some distros
642 build userspace this way, and it can produce a functioning kernel.
645 bool "Build a relocatable kernel"
646 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
647 select NONSTATIC_KERNEL
649 This builds a kernel image that is capable of running at the
650 location the kernel is loaded at. For ppc32, there is no any
651 alignment restrictions, and this feature is a superset of
652 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
653 16k-aligned base address. The kernel is linked as a
654 position-independent executable (PIE) and contains dynamic relocations
655 which are processed early in the bootup process.
657 One use is for the kexec on panic case where the recovery kernel
658 must live at a different physical address than the primary
661 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
662 it has been loaded at and the compile time physical addresses
663 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
664 setting can still be useful to bootwrappers that need to know the
665 load address of the kernel (eg. u-boot/mkimage).
667 config RANDOMIZE_BASE
668 bool "Randomize the address of the kernel image"
669 depends on PPC_85xx && FLATMEM
670 depends on RELOCATABLE
672 Randomizes the virtual address at which the kernel image is
673 loaded, as a security feature that deters exploit attempts
674 relying on knowledge of the location of kernel internals.
678 config RELOCATABLE_TEST
679 bool "Test relocatable kernel"
680 depends on (PPC64 && RELOCATABLE)
682 This runs the relocatable kernel at the address it was initially
683 loaded at, which tends to be non-zero and therefore test the
687 bool "Build a dump capture kernel"
688 depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
689 select RELOCATABLE if PPC64 || 44x || PPC_85xx
691 Build a kernel suitable for use as a dump capture kernel.
692 The same kernel binary can be used as production kernel and dump
696 bool "Firmware-assisted dump"
697 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
701 A robust mechanism to get reliable kernel crash dump with
702 assistance from firmware. This approach does not use kexec,
703 instead firmware assists in booting the capture kernel
704 while preserving memory contents. Firmware-assisted dump
705 is meant to be a kdump replacement offering robustness and
706 speed not possible without system firmware assistance.
708 If unsure, say "y". Only special kernels like petitboot may
709 need to say "N" here.
711 config PRESERVE_FA_DUMP
712 bool "Preserve Firmware-assisted dump"
713 depends on PPC64 && PPC_POWERNV && !FA_DUMP
715 On a kernel with FA_DUMP disabled, this option helps to preserve
716 crash data from a previously crash'ed kernel. Useful when the next
717 memory preserving kernel boot would process this crash data.
718 Petitboot kernel is the typical usecase for this option.
721 bool "Export OPAL memory as /sys/firmware/opal/core"
722 depends on PPC64 && PPC_POWERNV
724 This option uses the MPIPL support in firmware to provide an
725 ELF core of OPAL memory after a crash. The ELF core is exported
726 as /sys/firmware/opal/core file which is helpful in debugging
727 OPAL crashes using GDB.
730 bool "Distribute interrupts on all CPUs by default"
733 This option gives the kernel permission to distribute IRQs across
734 multiple CPUs. Saying N here will route all IRQs to the first
735 CPU. Generally saying Y is safe, although some problems have been
736 reported with SMP Power Macintoshes with this option enabled.
739 bool "NUMA Memory Allocation and Scheduler Support"
740 depends on PPC64 && SMP
741 default y if PPC_PSERIES || PPC_POWERNV
742 select USE_PERCPU_NUMA_NODE_ID
744 Enable NUMA (Non-Uniform Memory Access) support.
746 The kernel will try to allocate memory used by a CPU on the
747 local memory controller of the CPU and add some more
748 NUMA awareness to the kernel.
756 config HAVE_MEMORYLESS_NODES
760 config ARCH_SELECT_MEMORY_MODEL
764 config ARCH_FLATMEM_ENABLE
766 depends on (PPC64 && !NUMA) || PPC32
768 config ARCH_SPARSEMEM_ENABLE
771 select SPARSEMEM_VMEMMAP_ENABLE
773 config ARCH_SPARSEMEM_DEFAULT
775 depends on PPC_BOOK3S_64
777 config ILLEGAL_POINTER_VALUE
779 # This is roughly half way between the top of user space and the bottom
780 # of kernel space, which seems about as good as we can get.
781 default 0x5deadbeef0000000 if PPC64
784 config ARCH_MEMORY_PROBE
786 depends on MEMORY_HOTPLUG
790 default PPC_64K_PAGES if PPC_BOOK3S_64
793 Select the kernel logical page size. Increasing the page size
794 will reduce software overhead at each page boundary, allow
795 hardware prefetch mechanisms to be more effective, and allow
796 larger dma transfers increasing IO efficiency and reducing
797 overhead. However the utilization of memory will increase.
798 For example, each cached file will using a multiple of the
799 page size to hold its contents and the difference between the
800 end of file and the end of page is wasted.
802 Some dedicated systems, such as software raid serving with
803 accelerated calculations, have shown significant increases.
805 If you configure a 64 bit kernel for 64k pages but the
806 processor does not support them, then the kernel will simulate
807 them with 4k pages, loading them on demand, but with the
808 reduced software overhead and larger internal fragmentation.
809 For the 32 bit kernel, a large page option will not be offered
810 unless it is supported by the configured processor.
812 If unsure, choose 4K_PAGES.
816 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
820 depends on 44x || PPC_8xx
824 depends on 44x || PPC_BOOK3S_64
825 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
827 config PPC_256K_PAGES
828 bool "256k page size (Requires non-standard binutils settings)"
829 depends on 44x && !PPC_47x
831 Make the page size 256k.
833 The kernel will only be able to run applications that have been
834 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
835 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
836 definition from 0x10000 to 0x40000 in older versions.
842 depends on PPC_4K_PAGES
844 config PAGE_SIZE_16KB
846 depends on PPC_16K_PAGES
848 config PAGE_SIZE_64KB
850 depends on PPC_64K_PAGES
852 config PAGE_SIZE_256KB
854 depends on PPC_256K_PAGES
856 config PPC_PAGE_SHIFT
858 default 18 if PPC_256K_PAGES
859 default 16 if PPC_64K_PAGES
860 default 14 if PPC_16K_PAGES
864 int "Thread shift" if EXPERT
866 default "15" if PPC_256K_PAGES
867 default "14" if PPC64
870 Used to define the stack size. The default is almost always what you
871 want. Only change this if you know what you are doing.
873 config DATA_SHIFT_BOOL
874 bool "Set custom data alignment"
875 depends on ADVANCED_OPTIONS
876 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
877 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
880 This option allows you to set the kernel data alignment. When
881 RAM is mapped by blocks, the alignment needs to fit the size and
882 number of possible blocks. The default should be OK for most configs.
884 Say N here unless you know what you are doing.
887 int "Data shift" if DATA_SHIFT_BOOL
888 default 24 if STRICT_KERNEL_RWX && PPC64
889 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
890 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
891 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
892 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
893 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
894 default 23 if STRICT_KERNEL_RWX && PPC_8xx
895 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
896 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
897 default 24 if STRICT_KERNEL_RWX && PPC_85xx
898 default PPC_PAGE_SHIFT
900 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
901 Smaller is the alignment, greater is the number of necessary DBATs.
903 On 8xx, large pages (512kb or 8M) are used to map kernel linear
904 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
905 in that case. If PIN_TLB is selected, it must be aligned to 8M as
906 8M pages will be pinned.
908 config ARCH_FORCE_MAX_ORDER
909 int "Order of maximal physically contiguous allocations"
910 range 7 8 if PPC64 && PPC_64K_PAGES
911 default "8" if PPC64 && PPC_64K_PAGES
912 range 12 12 if PPC64 && !PPC_64K_PAGES
913 default "12" if PPC64 && !PPC_64K_PAGES
914 range 8 10 if PPC32 && PPC_16K_PAGES
915 default "8" if PPC32 && PPC_16K_PAGES
916 range 6 10 if PPC32 && PPC_64K_PAGES
917 default "6" if PPC32 && PPC_64K_PAGES
918 range 4 10 if PPC32 && PPC_256K_PAGES
919 default "4" if PPC32 && PPC_256K_PAGES
923 The kernel page allocator limits the size of maximal physically
924 contiguous allocations. The limit is called MAX_ORDER and it
925 defines the maximal power of two of number of pages that can be
926 allocated as a single contiguous block. This option allows
927 overriding the default setting when ability to allocate very
928 large blocks of physically contiguous memory is required.
930 The page size is not necessarily 4KB. For example, on 64-bit
931 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
932 this in mind when choosing a value for this option.
934 Don't change if unsure.
936 config PPC_SUBPAGE_PROT
937 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
939 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
941 This option adds support for system call to allow user programs
942 to set access permissions (read/write, readonly, or no access)
943 on the 4k subpages of each 64k page.
945 If unsure, say N here.
947 config PPC_PROT_SAO_LPAR
948 bool "Support PROT_SAO mappings in LPARs"
949 depends on PPC_BOOK3S_64
951 This option adds support for PROT_SAO mappings from userspace
952 inside LPARs on supported CPUs.
954 This may cause issues when performing guest migration from
955 a CPU that supports SAO to one that does not.
957 If unsure, say N here.
959 config PPC_COPRO_BASE
963 bool "SMT (Hyperthreading) scheduler support"
964 depends on PPC64 && SMP
966 SMT scheduler support improves the CPU scheduler's decision making
967 when dealing with POWER5 cpus at a cost of slightly increased
968 overhead in some places. If unsure say N here.
970 config PPC_DENORMALISATION
971 bool "PowerPC denormalisation exception handling"
972 depends on PPC_BOOK3S_64
973 default "y" if PPC_POWERNV
975 Add support for handling denormalisation of single precision
976 values. Useful for bare metal only. If unsure say Y here.
979 string "Initial kernel command string"
982 On some platforms, there is currently no way for the boot loader to
983 pass arguments to the kernel. For these platforms, you can supply
984 some command-line options at build time by entering them here. In
985 most cases you will need to specify the root device here.
988 prompt "Kernel command line type" if CMDLINE != ""
989 default CMDLINE_FROM_BOOTLOADER
991 config CMDLINE_FROM_BOOTLOADER
992 bool "Use bootloader kernel arguments if available"
994 Uses the command-line options passed by the boot loader. If
995 the boot loader doesn't provide any, the default kernel command
996 string provided in CMDLINE will be used.
998 config CMDLINE_EXTEND
999 bool "Extend bootloader kernel arguments"
1001 The command-line arguments provided by the boot loader will be
1002 appended to the default kernel command string.
1004 config CMDLINE_FORCE
1005 bool "Always use the default kernel command string"
1007 Always use the default kernel command string, even if the boot
1008 loader passes other arguments to the kernel.
1009 This is useful if you cannot or don't want to change the
1010 command-line options your boot loader passes to the kernel.
1014 config EXTRA_TARGETS
1015 string "Additional default image types"
1017 List additional targets to be built by the bootwrapper here (separated
1018 by spaces). This is useful for targets that depend of device tree
1019 files in the .dts directory.
1021 Targets in this list will be build as part of the default build
1022 target, or when the user does a 'make zImage' or a
1023 'make zImage.initrd'.
1025 If unsure, leave blank
1027 config ARCH_WANTS_FREEZER_CONTROL
1031 source "kernel/power/Kconfig"
1034 prompt "PowerPC Memory Protection Keys"
1036 depends on PPC_BOOK3S_64
1037 depends on PPC_64S_HASH_MMU
1038 select ARCH_USES_HIGH_VMA_FLAGS
1039 select ARCH_HAS_PKEYS
1041 Memory Protection Keys provides a mechanism for enforcing
1042 page-based protections, but without requiring modification of the
1043 page tables when an application changes protection domains.
1045 For details, see Documentation/core-api/protection-keys.rst
1049 config PPC_SECURE_BOOT
1050 prompt "Enable secure boot support"
1052 depends on PPC_POWERNV || PPC_PSERIES
1053 depends on IMA_ARCH_POLICY
1054 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1055 select PSERIES_PLPKS if PPC_PSERIES
1057 Systems with firmware secure boot enabled need to define security
1058 policies to extend secure boot to the OS. This config allows a user
1059 to enable OS secure boot on systems that have firmware support for
1060 it. If in doubt say N.
1062 config PPC_SECVAR_SYSFS
1063 bool "Enable sysfs interface for POWER secure variables"
1065 depends on PPC_SECURE_BOOT
1068 POWER secure variables are managed and controlled by firmware.
1069 These variables are exposed to userspace via sysfs to enable
1070 read/write operations on these variables. Say Y if you have
1071 secure boot enabled and want to expose variables to userspace.
1082 bool "Support for ISA-bus hardware"
1086 Find out whether you have ISA slots on your motherboard. ISA is the
1087 name of a bus system, i.e. the way the CPU talks to the other stuff
1088 inside your box. If you have an Apple machine, say N here; if you
1089 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1090 embedded board, consult your board documentation.
1092 config GENERIC_ISA_DMA
1094 depends on ISA_DMA_API
1097 config PPC_INDIRECT_PCI
1100 default y if 40x || 44x
1110 select ARCH_HAS_DMA_SET_MASK
1111 select PPC_INDIRECT_PCI
1117 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1119 Freescale MPC85xx/MPC86xx power management controller support
1120 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1125 depends on SUSPEND && (44x || 40x)
1127 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1128 It also enables support for two different idle states (idle-wait
1135 bool "Freescale Local Bus support"
1137 Enables reporting of errors from the Freescale local bus
1138 controller. Also contains some common code used by
1139 drivers for specific local bus peripherals.
1143 depends on PPC_83xx || QUICC_ENGINE || CPM2
1145 Freescale General-purpose Timers support
1149 depends on PCI && 8260
1150 select PPC_INDIRECT_PCI
1154 bool "Freescale Embedded SRIO Controller support"
1155 depends on RAPIDIO = y && HAVE_RAPIDIO
1158 Include support for RapidIO controller on Freescale embedded
1159 processors (MPC8548, MPC8641, etc).
1163 config NONSTATIC_KERNEL
1166 menu "Advanced setup"
1169 config ADVANCED_OPTIONS
1170 bool "Prompt for advanced kernel configuration options"
1172 This option will enable prompting for a variety of advanced kernel
1173 configuration options. These options can cause the kernel to not
1174 work if they are set incorrectly, but can be used to optimize certain
1175 aspects of kernel memory management.
1177 Unless you know what you are doing, say N here.
1179 comment "Default settings for advanced configuration options are used"
1180 depends on !ADVANCED_OPTIONS
1182 config LOWMEM_SIZE_BOOL
1183 bool "Set maximum low memory"
1184 depends on ADVANCED_OPTIONS
1186 This option allows you to set the maximum amount of memory which
1187 will be used as "low memory", that is, memory which the kernel can
1188 access directly, without having to set up a kernel virtual mapping.
1189 This can be useful in optimizing the layout of kernel virtual
1192 Say N here unless you know what you are doing.
1195 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1196 default "0x30000000"
1198 config LOWMEM_CAM_NUM_BOOL
1199 bool "Set number of CAMs to use to map low memory"
1200 depends on ADVANCED_OPTIONS && PPC_85xx
1202 This option allows you to set the maximum number of CAM slots that
1203 will be used to map low memory. There are a limited number of slots
1204 available and even more limited number that will fit in the L1 MMU.
1205 However, using more entries will allow mapping more low memory. This
1206 can be useful in optimizing the layout of kernel virtual memory.
1208 Say N here unless you know what you are doing.
1210 config LOWMEM_CAM_NUM
1212 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1213 default 3 if !STRICT_KERNEL_RWX
1214 default 9 if DATA_SHIFT >= 24
1215 default 12 if DATA_SHIFT >= 22
1218 config DYNAMIC_MEMSTART
1219 bool "Enable page aligned dynamic load address for kernel"
1220 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1221 select NONSTATIC_KERNEL
1223 This option enables the kernel to be loaded at any page aligned
1224 physical address. The kernel creates a mapping from KERNELBASE to
1225 the address where the kernel is loaded. The page size here implies
1226 the TLB page size of the mapping for kernel on the particular platform.
1227 Please refer to the init code for finding the TLB page size.
1229 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1230 kernel image, where the only restriction is the page aligned kernel
1231 load address. When this option is enabled, the compile time physical
1232 address CONFIG_PHYSICAL_START is ignored.
1234 This option is overridden by CONFIG_RELOCATABLE
1236 config PAGE_OFFSET_BOOL
1237 bool "Set custom page offset address"
1238 depends on ADVANCED_OPTIONS
1240 This option allows you to set the kernel virtual address at which
1241 the kernel will map low memory. This can be useful in optimizing
1242 the virtual memory layout of the system.
1244 Say N here unless you know what you are doing.
1247 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1248 default "0xc0000000"
1250 config KERNEL_START_BOOL
1251 bool "Set custom kernel base address"
1252 depends on ADVANCED_OPTIONS
1254 This option allows you to set the kernel virtual address at which
1255 the kernel will be loaded. Normally this should match PAGE_OFFSET
1256 however there are times (like kdump) that one might not want them
1259 Say N here unless you know what you are doing.
1262 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1263 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1264 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1265 default "0xc0000000"
1267 config PHYSICAL_START_BOOL
1268 bool "Set physical address where the kernel is loaded"
1269 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1271 This gives the physical address where the kernel is loaded.
1273 Say N here unless you know what you are doing.
1275 config PHYSICAL_START
1276 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1277 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1278 default "0x00000000"
1280 config PHYSICAL_ALIGN
1282 default "0x04000000" if PPC_85xx
1284 This value puts the alignment restrictions on physical address
1285 where kernel is loaded and run from. Kernel is compiled for an
1286 address which meets above alignment restriction.
1288 config TASK_SIZE_BOOL
1289 bool "Set custom user task size"
1290 depends on ADVANCED_OPTIONS
1292 This option allows you to set the amount of virtual address space
1293 allocated to user tasks. This can be useful in optimizing the
1294 virtual memory layout of the system.
1296 Say N here unless you know what you are doing.
1299 hex "Size of user task space" if TASK_SIZE_BOOL
1300 default "0x80000000" if PPC_8xx
1301 default "0xb0000000" if PPC_BOOK3S_32
1302 default "0xc0000000"
1306 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1309 default "0xc000000000000000"
1312 default "0xc000000000000000"
1313 config PHYSICAL_START
1315 default "0x00000000"
1318 config PPC_LIB_RHEAP
1321 source "arch/powerpc/kvm/Kconfig"
1323 source "kernel/livepatch/Kconfig"