1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
5 def_bool PPC64 && $(cc-option, -mabi=elfv2)
23 config ARCH_MMAP_RND_BITS_MAX
24 # On Book3S 64, the default virtual address space for 64-bit processes
25 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
26 # 32T of address space (2^45), which should ensure a reasonable gap
27 # between bottom-up and top-down allocations for applications that
28 # consume "normal" amounts of address space. Book3S 64 only supports 64K
30 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
31 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
33 # On all other 64-bit platforms (currently only Book3E), the virtual
34 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
35 # of address space (2^44). Only 4K page sizes are supported.
36 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
38 # For 32-bit, use the compat values, as they're the same.
39 default ARCH_MMAP_RND_COMPAT_BITS_MAX
41 config ARCH_MMAP_RND_BITS_MIN
42 # Allow randomisation to consume up to 1GB of address space (2^30).
43 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
44 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
46 # For 32-bit, use the compat values, as they're the same.
47 default ARCH_MMAP_RND_COMPAT_BITS_MIN
49 config ARCH_MMAP_RND_COMPAT_BITS_MAX
50 # Total virtual address space for 32-bit processes is 2^31 (2GB).
51 # Allow randomisation to consume up to 512MB of address space (2^29).
52 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
53 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
54 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
55 default 17 # 17 = 29 (512MB) - 12 (4K)
57 config ARCH_MMAP_RND_COMPAT_BITS_MIN
58 # Total virtual address space for 32-bit processes is 2^31 (2GB).
59 # Allow randomisation to consume up to 8MB of address space (2^23).
60 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
61 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
62 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
63 default 11 # 11 = 23 (8MB) - 12 (4K)
66 int "Number of virtual interrupt numbers"
70 This defines the number of virtual interrupt numbers the kernel
71 can manage. Virtual interrupt numbers are what you see in
72 /proc/interrupts. If you configure your system to have too few,
73 drivers will fail to load or worse - handle with care.
77 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
82 depends on HARDLOCKUP_DETECTOR
83 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
86 This is a placeholder when the powerpc hardlockup detector
87 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
88 selected via the generic lockup detector menu which is why we
89 have no standalone config option for it here.
91 config STACKTRACE_SUPPORT
95 config LOCKDEP_SUPPORT
99 config GENERIC_LOCKBREAK
102 depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS
104 config GENERIC_HWEIGHT
112 # Please keep this list sorted alphabetically.
114 select ARCH_32BIT_OFF_T if PPC32
115 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
116 select ARCH_ENABLE_MEMORY_HOTPLUG
117 select ARCH_ENABLE_MEMORY_HOTREMOVE
118 select ARCH_HAS_COPY_MC if PPC64
119 select ARCH_HAS_CURRENT_STACK_POINTER
120 select ARCH_HAS_DEBUG_VIRTUAL
121 select ARCH_HAS_DEBUG_VM_PGTABLE
122 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
123 select ARCH_HAS_DEVMEM_IS_ALLOWED
124 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
125 select ARCH_HAS_FORTIFY_SOURCE
126 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
129 select ARCH_HAS_MEMBARRIER_CALLBACKS
130 select ARCH_HAS_MEMBARRIER_SYNC_CORE
131 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
132 select ARCH_HAS_MMIOWB if PPC64
133 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
134 select ARCH_HAS_PHYS_TO_DMA
135 select ARCH_HAS_PMEM_API
136 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
137 select ARCH_HAS_PTE_SPECIAL
138 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
139 select ARCH_HAS_SET_MEMORY
140 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
141 select ARCH_HAS_STRICT_KERNEL_RWX if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE
142 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
143 select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT
144 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
145 select ARCH_HAS_UACCESS_FLUSHCACHE
146 select ARCH_HAS_UBSAN_SANITIZE_ALL
147 select ARCH_HAVE_NMI_SAFE_CMPXCHG
148 select ARCH_KEEP_MEMBLOCK
149 select ARCH_MIGHT_HAVE_PC_PARPORT
150 select ARCH_MIGHT_HAVE_PC_SERIO
151 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
152 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
153 select ARCH_SPLIT_ARG64 if PPC32
154 select ARCH_STACKWALK
155 select ARCH_SUPPORTS_ATOMIC_RMW
156 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
157 select ARCH_USE_BUILTIN_BSWAP
158 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
159 select ARCH_USE_MEMTEST
160 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
161 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
162 select ARCH_WANT_IPC_PARSE_VERSION
163 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
164 select ARCH_WANT_LD_ORPHAN_WARN
165 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
166 select ARCH_WEAK_RELEASE_ACQUIRE
168 select BUILDTIME_TABLE_SORT
169 select CLONE_BACKWARDS
170 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
171 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
172 select DMA_OPS_BYPASS if PPC64
173 select DMA_OPS if PPC64
174 select DYNAMIC_FTRACE if FUNCTION_TRACER
175 select EDAC_ATOMIC_SCRUB
177 select GENERIC_ATOMIC64 if PPC32
178 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
179 select GENERIC_CMOS_UPDATE
180 select GENERIC_CPU_AUTOPROBE
181 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
182 select GENERIC_EARLY_IOREMAP
183 select GENERIC_GETTIMEOFDAY
184 select GENERIC_IRQ_SHOW
185 select GENERIC_IRQ_SHOW_LEVEL
186 select GENERIC_PCI_IOMAP if PCI
187 select GENERIC_PTDUMP
188 select GENERIC_SMP_IDLE_THREAD
189 select GENERIC_TIME_VSYSCALL
190 select GENERIC_VDSO_TIME_NS
191 select HAVE_ARCH_AUDITSYSCALL
192 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
193 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
194 select HAVE_ARCH_JUMP_LABEL
195 select HAVE_ARCH_JUMP_LABEL_RELATIVE
196 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
197 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
198 select HAVE_ARCH_KASAN if PPC_BOOK3E_64
199 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
200 select HAVE_ARCH_KCSAN if PPC_BOOK3S_64
201 select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
202 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
203 select HAVE_ARCH_KGDB
204 select HAVE_ARCH_MMAP_RND_BITS
205 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
206 select HAVE_ARCH_NVRAM_OPS
207 select HAVE_ARCH_SECCOMP_FILTER
208 select HAVE_ARCH_TRACEHOOK
209 select HAVE_ASM_MODVERSIONS
210 select HAVE_CONTEXT_TRACKING_USER
211 select HAVE_C_RECORDMCOUNT
212 select HAVE_DEBUG_KMEMLEAK
213 select HAVE_DEBUG_STACKOVERFLOW
214 select HAVE_DYNAMIC_FTRACE
215 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
216 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
218 select HAVE_EFFICIENT_UNALIGNED_ACCESS
220 select HAVE_FTRACE_MCOUNT_RECORD
221 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
222 select HAVE_FUNCTION_ERROR_INJECTION
223 select HAVE_FUNCTION_GRAPH_TRACER
224 select HAVE_FUNCTION_TRACER
225 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
226 select HAVE_GENERIC_VDSO
227 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
228 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
229 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
230 select HAVE_IOREMAP_PROT
231 select HAVE_IRQ_TIME_ACCOUNTING
232 select HAVE_KERNEL_GZIP
233 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
234 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
235 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
237 select HAVE_KPROBES_ON_FTRACE
238 select HAVE_KRETPROBES
239 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT
240 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
241 select HAVE_MOD_ARCH_SPECIFIC
242 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
243 select HAVE_OPTPROBES
244 select HAVE_OBJTOOL if PPC32 || MPROFILE_KERNEL
245 select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
246 select HAVE_PERF_EVENTS
247 select HAVE_PERF_EVENTS_NMI if PPC64
248 select HAVE_PERF_REGS
249 select HAVE_PERF_USER_STACK_DUMP
250 select HAVE_REGS_AND_STACK_ACCESS_API
251 select HAVE_RELIABLE_STACKTRACE
253 select HAVE_SETUP_PER_CPU_AREA if PPC64
254 select HAVE_SOFTIRQ_ON_OWN_STACK
255 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
256 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
257 select HAVE_STATIC_CALL if PPC32
258 select HAVE_SYSCALL_TRACEPOINTS
259 select HAVE_VIRT_CPU_ACCOUNTING
260 select HAVE_VIRT_CPU_ACCOUNTING_GEN
261 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
262 select IOMMU_HELPER if PPC64
264 select IRQ_FORCED_THREADING
265 select KASAN_VMALLOC if KASAN && MODULES
266 select MMU_GATHER_PAGE_SIZE
267 select MMU_GATHER_RCU_TABLE_FREE
268 select MMU_GATHER_MERGE_VMAS
269 select MODULES_USE_ELF_RELA
270 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
271 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
272 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
273 select NEED_SG_DMA_LENGTH
275 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
276 select OF_EARLY_FLATTREE
277 select OLD_SIGACTION if PPC32
278 select OLD_SIGSUSPEND
279 select PCI_DOMAINS if PCI
280 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
281 select PCI_SYSCALL if PCI
282 select PPC_DAWR if PPC64
285 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
286 select SYSCTL_EXCEPTION_TRACE
287 select THREAD_INFO_IN_TASK
288 select TRACE_IRQFLAGS_SUPPORT
290 # Please keep this list sorted alphabetically.
293 config PPC_LONG_DOUBLE_128
294 depends on PPC64 && ALTIVEC
295 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
297 config PPC_BARRIER_NOSPEC
300 depends on PPC_BOOK3S_64 || PPC_E500
302 config PPC_HAS_LBARX_LHARX
314 bool "Enable support for 32bit binaries"
316 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
317 default y if !CPU_LITTLE_ENDIAN
318 select ARCH_WANT_OLD_COMPAT_IPC
319 select COMPAT_OLD_SIGACTION
321 config SCHED_OMIT_FRAME_POINTER
325 config ARCH_MAY_HAVE_PC_FDC
329 config PPC_UDBG_16550
332 config GENERIC_TBSYNC
334 default y if PPC32 && SMP
345 config GENERIC_BUG_RELATIVE_POINTERS
347 depends on GENERIC_BUG
349 config SYS_SUPPORTS_APM_EMULATION
350 default y if PMAC_APM_EMU
356 Used to allow a board to specify it wants an ePAPR compliant wrapper.
358 config DEFAULT_UIMAGE
361 Used to allow a board to specify it wants a uImage built by default
363 config ARCH_HIBERNATION_POSSIBLE
367 config ARCH_SUSPEND_POSSIBLE
369 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
370 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
373 config ARCH_SUSPEND_NONZERO_CPU
375 depends on PPC_POWERNV || PPC_PSERIES
377 config ARCH_HAS_ADD_PAGES
379 depends on ARCH_ENABLE_MEMORY_HOTPLUG
381 config PPC_DCR_NATIVE
389 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
392 config PPC_PCI_OF_BUS_MAP
393 bool "Use pci_to_OF_bus_map (deprecated)"
395 depends on PPC_PMAC || PPC_CHRP
397 This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which
398 restricts the system to only having 256 PCI buses. On CHRP it also causes
399 the "pci-OF-bus-map" property to be created in the device tree.
403 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
405 depends on !PPC_PCI_OF_BUS_MAP
406 bool "Assign PCI bus numbers from zero individually for each PCI domain"
409 By default on PPC32 were PCI bus numbers unique across all PCI domains.
410 So system could have only 256 PCI buses independently of available
411 PCI domains. When this option is enabled then PCI bus numbers are
412 PCI domain dependent and each PCI controller on own domain can have
413 256 PCI buses, like it is on other Linux architectures.
415 config PPC_OF_PLATFORM_PCI
418 depends on PPC64 # not supported on 32 bits yet
420 config ARCH_SUPPORTS_UPROBES
423 config PPC_ADV_DEBUG_REGS
425 depends on 40x || BOOKE
428 config PPC_ADV_DEBUG_IACS
430 depends on PPC_ADV_DEBUG_REGS
434 config PPC_ADV_DEBUG_DACS
436 depends on PPC_ADV_DEBUG_REGS
439 config PPC_ADV_DEBUG_DVCS
441 depends on PPC_ADV_DEBUG_REGS
445 config PPC_ADV_DEBUG_DAC_RANGE
447 depends on PPC_ADV_DEBUG_REGS && 44x
453 config PGTABLE_LEVELS
458 source "arch/powerpc/sysdev/Kconfig"
459 source "arch/powerpc/platforms/Kconfig"
461 menu "Kernel options"
464 bool "High memory support"
468 source "kernel/Kconfig.hz"
470 config MATH_EMULATION
471 bool "Math emulation"
472 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
475 Some PowerPC chips designed for embedded applications do not have
476 a floating-point unit and therefore do not implement the
477 floating-point instructions in the PowerPC instruction set. If you
478 say Y here, the kernel will include code to emulate a floating-point
479 unit, which will allow programs that use floating-point
482 This is also useful to emulate missing (optional) instructions
483 such as fsqrt on cores that do have an FPU but do not implement
484 them (such as Freescale BookE).
487 prompt "Math emulation options"
488 default MATH_EMULATION_FULL
489 depends on MATH_EMULATION
491 config MATH_EMULATION_FULL
492 bool "Emulate all the floating point instructions"
494 Select this option will enable the kernel to support to emulate
495 all the floating point instructions. If your SoC doesn't have
496 a FPU, you should select this.
498 config MATH_EMULATION_HW_UNIMPLEMENTED
499 bool "Just emulate the FPU unimplemented instructions"
501 Select this if you know there does have a hardware FPU on your
502 SoC, but some floating point instructions are not implemented by that.
506 config PPC_TRANSACTIONAL_MEM
507 bool "Transactional Memory support for POWERPC"
508 depends on PPC_BOOK3S_64
513 Support user-mode Transactional Memory on POWERPC.
516 bool "Ultravisor support"
517 depends on KVM_BOOK3S_HV_POSSIBLE
518 depends on DEVICE_PRIVATE
521 This option paravirtualizes the kernel to run in POWER platforms that
522 supports the Protected Execution Facility (PEF). On such platforms,
523 the ultravisor firmware runs at a privilege level above the
528 config LD_HEAD_STUB_CATCH
529 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
532 Very large kernels can cause linker branch stubs to be generated by
533 code in head_64.S, which moves the head text sections out of their
534 specified location. This option can work around the problem.
538 config MPROFILE_KERNEL
539 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
540 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
543 bool "Support for enabling/disabling CPUs"
544 depends on SMP && (PPC_PSERIES || \
545 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
547 Say Y here to be able to disable and re-enable individual
548 CPUs at runtime on SMP machines.
550 Say N if you are unsure.
552 config INTERRUPT_SANITIZE_REGISTERS
553 bool "Clear gprs on interrupt arrival"
554 depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
555 default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
557 Reduce the influence of user register state on interrupt handlers and
558 syscalls through clearing user state from registers before handling
561 config PPC_QUEUED_SPINLOCKS
562 bool "Queued spinlocks" if EXPERT
564 default PPC_BOOK3S_64
566 Say Y here to use queued spinlocks which give better scalability and
567 fairness on large SMP and NUMA systems without harming single threaded
570 config ARCH_CPU_PROBE_RELEASE
572 depends on HOTPLUG_CPU
574 config PPC64_SUPPORTS_MEMORY_FAILURE
575 bool "Add support for memory hwpoison"
576 depends on PPC_BOOK3S_64
577 default "y" if PPC_POWERNV
578 select ARCH_SUPPORTS_MEMORY_FAILURE
581 bool "kexec system call"
582 depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP)
585 kexec is a system call that implements the ability to shutdown your
586 current kernel, and to start another kernel. It is like a reboot
587 but it is independent of the system firmware. And like a reboot
588 you can start any kernel with it, not just Linux.
590 The name comes from the similarity to the exec system call.
592 It is an ongoing process to be certain the hardware in a machine
593 is properly shutdown, so do not be surprised if this code does not
594 initially work for you. As of this writing the exact hardware
595 interface is strongly in flux, so no good recommendation can be
599 bool "kexec file based system call"
601 select HAVE_IMA_KEXEC if IMA
605 depends on CRYPTO_SHA256=y
607 This is a new version of the kexec system call. This call is
608 file based and takes in file descriptors as system call arguments
609 for kernel and initramfs as opposed to a list of segments as is the
610 case for the older kexec call.
612 config ARCH_HAS_KEXEC_PURGATORY
615 config PPC64_BIG_ENDIAN_ELF_ABI_V2
616 bool "Build big-endian kernel using ELF ABI V2 (EXPERIMENTAL)"
617 depends on PPC64 && CPU_BIG_ENDIAN
618 depends on CC_HAS_ELFV2
619 depends on LD_IS_BFD && LD_VERSION >= 22400
622 This builds the kernel image using the "Power Architecture 64-Bit ELF
623 V2 ABI Specification", which has a reduced stack overhead and faster
624 function calls. This internal kernel ABI option does not affect
625 userspace compatibility.
627 The V2 ABI is standard for 64-bit little-endian, but for big-endian
628 it is less well tested by kernel and toolchain. However some distros
629 build userspace this way, and it can produce a functioning kernel.
631 This requires GCC and binutils 2.24 or newer.
634 bool "Build a relocatable kernel"
635 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
636 select NONSTATIC_KERNEL
638 This builds a kernel image that is capable of running at the
639 location the kernel is loaded at. For ppc32, there is no any
640 alignment restrictions, and this feature is a superset of
641 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
642 16k-aligned base address. The kernel is linked as a
643 position-independent executable (PIE) and contains dynamic relocations
644 which are processed early in the bootup process.
646 One use is for the kexec on panic case where the recovery kernel
647 must live at a different physical address than the primary
650 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
651 it has been loaded at and the compile time physical addresses
652 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
653 setting can still be useful to bootwrappers that need to know the
654 load address of the kernel (eg. u-boot/mkimage).
656 config RANDOMIZE_BASE
657 bool "Randomize the address of the kernel image"
658 depends on PPC_85xx && FLATMEM
659 depends on RELOCATABLE
661 Randomizes the virtual address at which the kernel image is
662 loaded, as a security feature that deters exploit attempts
663 relying on knowledge of the location of kernel internals.
667 config RELOCATABLE_TEST
668 bool "Test relocatable kernel"
669 depends on (PPC64 && RELOCATABLE)
671 This runs the relocatable kernel at the address it was initially
672 loaded at, which tends to be non-zero and therefore test the
676 bool "Build a dump capture kernel"
677 depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
678 select RELOCATABLE if PPC64 || 44x || PPC_85xx
680 Build a kernel suitable for use as a dump capture kernel.
681 The same kernel binary can be used as production kernel and dump
685 bool "Firmware-assisted dump"
686 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
690 A robust mechanism to get reliable kernel crash dump with
691 assistance from firmware. This approach does not use kexec,
692 instead firmware assists in booting the capture kernel
693 while preserving memory contents. Firmware-assisted dump
694 is meant to be a kdump replacement offering robustness and
695 speed not possible without system firmware assistance.
697 If unsure, say "y". Only special kernels like petitboot may
698 need to say "N" here.
700 config PRESERVE_FA_DUMP
701 bool "Preserve Firmware-assisted dump"
702 depends on PPC64 && PPC_POWERNV && !FA_DUMP
704 On a kernel with FA_DUMP disabled, this option helps to preserve
705 crash data from a previously crash'ed kernel. Useful when the next
706 memory preserving kernel boot would process this crash data.
707 Petitboot kernel is the typical usecase for this option.
710 bool "Export OPAL memory as /sys/firmware/opal/core"
711 depends on PPC64 && PPC_POWERNV
713 This option uses the MPIPL support in firmware to provide an
714 ELF core of OPAL memory after a crash. The ELF core is exported
715 as /sys/firmware/opal/core file which is helpful in debugging
716 OPAL crashes using GDB.
719 bool "Distribute interrupts on all CPUs by default"
722 This option gives the kernel permission to distribute IRQs across
723 multiple CPUs. Saying N here will route all IRQs to the first
724 CPU. Generally saying Y is safe, although some problems have been
725 reported with SMP Power Macintoshes with this option enabled.
728 bool "NUMA Memory Allocation and Scheduler Support"
729 depends on PPC64 && SMP
730 default y if PPC_PSERIES || PPC_POWERNV
731 select USE_PERCPU_NUMA_NODE_ID
733 Enable NUMA (Non-Uniform Memory Access) support.
735 The kernel will try to allocate memory used by a CPU on the
736 local memory controller of the CPU and add some more
737 NUMA awareness to the kernel.
745 config HAVE_MEMORYLESS_NODES
749 config ARCH_SELECT_MEMORY_MODEL
753 config ARCH_FLATMEM_ENABLE
755 depends on (PPC64 && !NUMA) || PPC32
757 config ARCH_SPARSEMEM_ENABLE
760 select SPARSEMEM_VMEMMAP_ENABLE
762 config ARCH_SPARSEMEM_DEFAULT
764 depends on PPC_BOOK3S_64
766 config ILLEGAL_POINTER_VALUE
768 # This is roughly half way between the top of user space and the bottom
769 # of kernel space, which seems about as good as we can get.
770 default 0x5deadbeef0000000 if PPC64
773 config ARCH_MEMORY_PROBE
775 depends on MEMORY_HOTPLUG
779 default PPC_64K_PAGES if PPC_BOOK3S_64
782 Select the kernel logical page size. Increasing the page size
783 will reduce software overhead at each page boundary, allow
784 hardware prefetch mechanisms to be more effective, and allow
785 larger dma transfers increasing IO efficiency and reducing
786 overhead. However the utilization of memory will increase.
787 For example, each cached file will using a multiple of the
788 page size to hold its contents and the difference between the
789 end of file and the end of page is wasted.
791 Some dedicated systems, such as software raid serving with
792 accelerated calculations, have shown significant increases.
794 If you configure a 64 bit kernel for 64k pages but the
795 processor does not support them, then the kernel will simulate
796 them with 4k pages, loading them on demand, but with the
797 reduced software overhead and larger internal fragmentation.
798 For the 32 bit kernel, a large page option will not be offered
799 unless it is supported by the configured processor.
801 If unsure, choose 4K_PAGES.
805 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
809 depends on 44x || PPC_8xx
813 depends on 44x || PPC_BOOK3S_64
814 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
816 config PPC_256K_PAGES
817 bool "256k page size (Requires non-standard binutils settings)"
818 depends on 44x && !PPC_47x
820 Make the page size 256k.
822 The kernel will only be able to run applications that have been
823 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
824 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
825 definition from 0x10000 to 0x40000 in older versions.
831 depends on PPC_4K_PAGES
833 config PAGE_SIZE_16KB
835 depends on PPC_16K_PAGES
837 config PAGE_SIZE_64KB
839 depends on PPC_64K_PAGES
841 config PAGE_SIZE_256KB
843 depends on PPC_256K_PAGES
845 config PPC_PAGE_SHIFT
847 default 18 if PPC_256K_PAGES
848 default 16 if PPC_64K_PAGES
849 default 14 if PPC_16K_PAGES
853 int "Thread shift" if EXPERT
855 default "15" if PPC_256K_PAGES
856 default "14" if PPC64
859 Used to define the stack size. The default is almost always what you
860 want. Only change this if you know what you are doing.
862 config DATA_SHIFT_BOOL
863 bool "Set custom data alignment"
864 depends on ADVANCED_OPTIONS
865 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
866 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
869 This option allows you to set the kernel data alignment. When
870 RAM is mapped by blocks, the alignment needs to fit the size and
871 number of possible blocks. The default should be OK for most configs.
873 Say N here unless you know what you are doing.
876 int "Data shift" if DATA_SHIFT_BOOL
877 default 24 if STRICT_KERNEL_RWX && PPC64
878 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
879 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
880 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
881 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
882 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
883 default 23 if STRICT_KERNEL_RWX && PPC_8xx
884 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
885 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
886 default 24 if STRICT_KERNEL_RWX && PPC_85xx
887 default PPC_PAGE_SHIFT
889 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
890 Smaller is the alignment, greater is the number of necessary DBATs.
892 On 8xx, large pages (512kb or 8M) are used to map kernel linear
893 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
894 in that case. If PIN_TLB is selected, it must be aligned to 8M as
895 8M pages will be pinned.
897 config ARCH_FORCE_MAX_ORDER
898 int "Maximum zone order"
899 range 8 9 if PPC64 && PPC_64K_PAGES
900 default "9" if PPC64 && PPC_64K_PAGES
901 range 13 13 if PPC64 && !PPC_64K_PAGES
902 default "13" if PPC64 && !PPC_64K_PAGES
903 range 9 64 if PPC32 && PPC_16K_PAGES
904 default "9" if PPC32 && PPC_16K_PAGES
905 range 7 64 if PPC32 && PPC_64K_PAGES
906 default "7" if PPC32 && PPC_64K_PAGES
907 range 5 64 if PPC32 && PPC_256K_PAGES
908 default "5" if PPC32 && PPC_256K_PAGES
912 The kernel memory allocator divides physically contiguous memory
913 blocks into "zones", where each zone is a power of two number of
914 pages. This option selects the largest power of two that the kernel
915 keeps in the memory allocator. If you need to allocate very large
916 blocks of physically contiguous memory, then you may need to
919 This config option is actually maximum order plus one. For example,
920 a value of 11 means that the largest free memory block is 2^10 pages.
922 The page size is not necessarily 4KB. For example, on 64-bit
923 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
924 this in mind when choosing a value for this option.
926 config PPC_SUBPAGE_PROT
927 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
929 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
931 This option adds support for system call to allow user programs
932 to set access permissions (read/write, readonly, or no access)
933 on the 4k subpages of each 64k page.
935 If unsure, say N here.
937 config PPC_PROT_SAO_LPAR
938 bool "Support PROT_SAO mappings in LPARs"
939 depends on PPC_BOOK3S_64
941 This option adds support for PROT_SAO mappings from userspace
942 inside LPARs on supported CPUs.
944 This may cause issues when performing guest migration from
945 a CPU that supports SAO to one that does not.
947 If unsure, say N here.
949 config PPC_COPRO_BASE
953 bool "SMT (Hyperthreading) scheduler support"
954 depends on PPC64 && SMP
956 SMT scheduler support improves the CPU scheduler's decision making
957 when dealing with POWER5 cpus at a cost of slightly increased
958 overhead in some places. If unsure say N here.
960 config PPC_DENORMALISATION
961 bool "PowerPC denormalisation exception handling"
962 depends on PPC_BOOK3S_64
963 default "y" if PPC_POWERNV
965 Add support for handling denormalisation of single precision
966 values. Useful for bare metal only. If unsure say Y here.
969 string "Initial kernel command string"
972 On some platforms, there is currently no way for the boot loader to
973 pass arguments to the kernel. For these platforms, you can supply
974 some command-line options at build time by entering them here. In
975 most cases you will need to specify the root device here.
978 prompt "Kernel command line type" if CMDLINE != ""
979 default CMDLINE_FROM_BOOTLOADER
981 config CMDLINE_FROM_BOOTLOADER
982 bool "Use bootloader kernel arguments if available"
984 Uses the command-line options passed by the boot loader. If
985 the boot loader doesn't provide any, the default kernel command
986 string provided in CMDLINE will be used.
988 config CMDLINE_EXTEND
989 bool "Extend bootloader kernel arguments"
991 The command-line arguments provided by the boot loader will be
992 appended to the default kernel command string.
995 bool "Always use the default kernel command string"
997 Always use the default kernel command string, even if the boot
998 loader passes other arguments to the kernel.
999 This is useful if you cannot or don't want to change the
1000 command-line options your boot loader passes to the kernel.
1004 config EXTRA_TARGETS
1005 string "Additional default image types"
1007 List additional targets to be built by the bootwrapper here (separated
1008 by spaces). This is useful for targets that depend of device tree
1009 files in the .dts directory.
1011 Targets in this list will be build as part of the default build
1012 target, or when the user does a 'make zImage' or a
1013 'make zImage.initrd'.
1015 If unsure, leave blank
1017 config ARCH_WANTS_FREEZER_CONTROL
1021 source "kernel/power/Kconfig"
1024 prompt "PowerPC Memory Protection Keys"
1026 depends on PPC_BOOK3S_64
1027 depends on PPC_64S_HASH_MMU
1028 select ARCH_USES_HIGH_VMA_FLAGS
1029 select ARCH_HAS_PKEYS
1031 Memory Protection Keys provides a mechanism for enforcing
1032 page-based protections, but without requiring modification of the
1033 page tables when an application changes protection domains.
1035 For details, see Documentation/core-api/protection-keys.rst
1039 config PPC_SECURE_BOOT
1040 prompt "Enable secure boot support"
1042 depends on PPC_POWERNV || PPC_PSERIES
1043 depends on IMA_ARCH_POLICY
1044 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
1045 select PSERIES_PLPKS if PPC_PSERIES
1047 Systems with firmware secure boot enabled need to define security
1048 policies to extend secure boot to the OS. This config allows a user
1049 to enable OS secure boot on systems that have firmware support for
1050 it. If in doubt say N.
1052 config PPC_SECVAR_SYSFS
1053 bool "Enable sysfs interface for POWER secure variables"
1055 depends on PPC_SECURE_BOOT
1058 POWER secure variables are managed and controlled by firmware.
1059 These variables are exposed to userspace via sysfs to enable
1060 read/write operations on these variables. Say Y if you have
1061 secure boot enabled and want to expose variables to userspace.
1072 bool "Support for ISA-bus hardware"
1076 Find out whether you have ISA slots on your motherboard. ISA is the
1077 name of a bus system, i.e. the way the CPU talks to the other stuff
1078 inside your box. If you have an Apple machine, say N here; if you
1079 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1080 embedded board, consult your board documentation.
1082 config GENERIC_ISA_DMA
1084 depends on ISA_DMA_API
1087 config PPC_INDIRECT_PCI
1090 default y if 40x || 44x
1100 select ARCH_HAS_DMA_SET_MASK
1101 select PPC_INDIRECT_PCI
1107 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1109 Freescale MPC85xx/MPC86xx power management controller support
1110 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1115 depends on SUSPEND && (44x || 40x)
1117 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1118 It also enables support for two different idle states (idle-wait
1125 bool "Freescale Local Bus support"
1127 Enables reporting of errors from the Freescale local bus
1128 controller. Also contains some common code used by
1129 drivers for specific local bus peripherals.
1133 depends on PPC_83xx || QUICC_ENGINE || CPM2
1135 Freescale General-purpose Timers support
1139 depends on PCI && 8260
1140 select PPC_INDIRECT_PCI
1144 bool "Freescale Embedded SRIO Controller support"
1145 depends on RAPIDIO = y && HAVE_RAPIDIO
1148 Include support for RapidIO controller on Freescale embedded
1149 processors (MPC8548, MPC8641, etc).
1153 config NONSTATIC_KERNEL
1156 menu "Advanced setup"
1159 config ADVANCED_OPTIONS
1160 bool "Prompt for advanced kernel configuration options"
1162 This option will enable prompting for a variety of advanced kernel
1163 configuration options. These options can cause the kernel to not
1164 work if they are set incorrectly, but can be used to optimize certain
1165 aspects of kernel memory management.
1167 Unless you know what you are doing, say N here.
1169 comment "Default settings for advanced configuration options are used"
1170 depends on !ADVANCED_OPTIONS
1172 config LOWMEM_SIZE_BOOL
1173 bool "Set maximum low memory"
1174 depends on ADVANCED_OPTIONS
1176 This option allows you to set the maximum amount of memory which
1177 will be used as "low memory", that is, memory which the kernel can
1178 access directly, without having to set up a kernel virtual mapping.
1179 This can be useful in optimizing the layout of kernel virtual
1182 Say N here unless you know what you are doing.
1185 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1186 default "0x30000000"
1188 config LOWMEM_CAM_NUM_BOOL
1189 bool "Set number of CAMs to use to map low memory"
1190 depends on ADVANCED_OPTIONS && PPC_85xx
1192 This option allows you to set the maximum number of CAM slots that
1193 will be used to map low memory. There are a limited number of slots
1194 available and even more limited number that will fit in the L1 MMU.
1195 However, using more entries will allow mapping more low memory. This
1196 can be useful in optimizing the layout of kernel virtual memory.
1198 Say N here unless you know what you are doing.
1200 config LOWMEM_CAM_NUM
1202 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1203 default 3 if !STRICT_KERNEL_RWX
1204 default 9 if DATA_SHIFT >= 24
1205 default 12 if DATA_SHIFT >= 22
1208 config DYNAMIC_MEMSTART
1209 bool "Enable page aligned dynamic load address for kernel"
1210 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1211 select NONSTATIC_KERNEL
1213 This option enables the kernel to be loaded at any page aligned
1214 physical address. The kernel creates a mapping from KERNELBASE to
1215 the address where the kernel is loaded. The page size here implies
1216 the TLB page size of the mapping for kernel on the particular platform.
1217 Please refer to the init code for finding the TLB page size.
1219 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1220 kernel image, where the only restriction is the page aligned kernel
1221 load address. When this option is enabled, the compile time physical
1222 address CONFIG_PHYSICAL_START is ignored.
1224 This option is overridden by CONFIG_RELOCATABLE
1226 config PAGE_OFFSET_BOOL
1227 bool "Set custom page offset address"
1228 depends on ADVANCED_OPTIONS
1230 This option allows you to set the kernel virtual address at which
1231 the kernel will map low memory. This can be useful in optimizing
1232 the virtual memory layout of the system.
1234 Say N here unless you know what you are doing.
1237 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1238 default "0xc0000000"
1240 config KERNEL_START_BOOL
1241 bool "Set custom kernel base address"
1242 depends on ADVANCED_OPTIONS
1244 This option allows you to set the kernel virtual address at which
1245 the kernel will be loaded. Normally this should match PAGE_OFFSET
1246 however there are times (like kdump) that one might not want them
1249 Say N here unless you know what you are doing.
1252 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1253 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1254 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1255 default "0xc0000000"
1257 config PHYSICAL_START_BOOL
1258 bool "Set physical address where the kernel is loaded"
1259 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1261 This gives the physical address where the kernel is loaded.
1263 Say N here unless you know what you are doing.
1265 config PHYSICAL_START
1266 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1267 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1268 default "0x00000000"
1270 config PHYSICAL_ALIGN
1272 default "0x04000000" if PPC_85xx
1274 This value puts the alignment restrictions on physical address
1275 where kernel is loaded and run from. Kernel is compiled for an
1276 address which meets above alignment restriction.
1278 config TASK_SIZE_BOOL
1279 bool "Set custom user task size"
1280 depends on ADVANCED_OPTIONS
1282 This option allows you to set the amount of virtual address space
1283 allocated to user tasks. This can be useful in optimizing the
1284 virtual memory layout of the system.
1286 Say N here unless you know what you are doing.
1289 hex "Size of user task space" if TASK_SIZE_BOOL
1290 default "0x80000000" if PPC_8xx
1291 default "0xb0000000" if PPC_BOOK3S_32
1292 default "0xc0000000"
1296 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1299 default "0xc000000000000000"
1302 default "0xc000000000000000"
1303 config PHYSICAL_START
1305 default "0x00000000"
1308 config PPC_LIB_RHEAP
1311 source "arch/powerpc/kvm/Kconfig"
1313 source "kernel/livepatch/Kconfig"