1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
63 int "Number of virtual interrupt numbers"
67 This defines the number of virtual interrupt numbers the kernel
68 can manage. Virtual interrupt numbers are what you see in
69 /proc/interrupts. If you configure your system to have too few,
70 drivers will fail to load or worse - handle with care.
74 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
79 depends on HARDLOCKUP_DETECTOR
80 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
83 This is a placeholder when the powerpc hardlockup detector
84 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
85 selected via the generic lockup detector menu which is why we
86 have no standalone config option for it here.
88 config STACKTRACE_SUPPORT
92 config LOCKDEP_SUPPORT
96 config GENERIC_LOCKBREAK
99 depends on SMP && PREEMPTION
101 config GENERIC_HWEIGHT
109 # Please keep this list sorted alphabetically.
111 select ARCH_32BIT_OFF_T if PPC32
112 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
113 select ARCH_ENABLE_MEMORY_HOTPLUG
114 select ARCH_ENABLE_MEMORY_HOTREMOVE
115 select ARCH_HAS_COPY_MC if PPC64
116 select ARCH_HAS_CURRENT_STACK_POINTER
117 select ARCH_HAS_DEBUG_VIRTUAL
118 select ARCH_HAS_DEBUG_VM_PGTABLE
119 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
120 select ARCH_HAS_DEVMEM_IS_ALLOWED
121 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
122 select ARCH_HAS_FORTIFY_SOURCE
123 select ARCH_HAS_GCOV_PROFILE_ALL
124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
126 select ARCH_HAS_MEMBARRIER_CALLBACKS
127 select ARCH_HAS_MEMBARRIER_SYNC_CORE
128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
131 select ARCH_HAS_PHYS_TO_DMA
132 select ARCH_HAS_PMEM_API
133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
134 select ARCH_HAS_PTE_SPECIAL
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_SET_MEMORY
137 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
138 select ARCH_HAS_STRICT_KERNEL_RWX if FSL_BOOKE && !HIBERNATION && !RANDOMIZE_BASE
139 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
140 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
141 select ARCH_HAS_UACCESS_FLUSHCACHE
142 select ARCH_HAS_UBSAN_SANITIZE_ALL
143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
144 select ARCH_KEEP_MEMBLOCK
145 select ARCH_MIGHT_HAVE_PC_PARPORT
146 select ARCH_MIGHT_HAVE_PC_SERIO
147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
148 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
149 select ARCH_STACKWALK
150 select ARCH_SUPPORTS_ATOMIC_RMW
151 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
152 select ARCH_USE_BUILTIN_BSWAP
153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
154 select ARCH_USE_MEMTEST
155 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
156 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
157 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
158 select ARCH_WANT_IPC_PARSE_VERSION
159 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
160 select ARCH_WANT_LD_ORPHAN_WARN
161 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
162 select ARCH_WANTS_NO_INSTR
163 select ARCH_WEAK_RELEASE_ACQUIRE
165 select BUILDTIME_TABLE_SORT
166 select CLONE_BACKWARDS
167 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
168 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
169 select DMA_OPS_BYPASS if PPC64
170 select DMA_OPS if PPC64
171 select DYNAMIC_FTRACE if FUNCTION_TRACER
172 select EDAC_ATOMIC_SCRUB
174 select GENERIC_ATOMIC64 if PPC32
175 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
176 select GENERIC_CMOS_UPDATE
177 select GENERIC_CPU_AUTOPROBE
178 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
179 select GENERIC_EARLY_IOREMAP
180 select GENERIC_GETTIMEOFDAY
181 select GENERIC_IRQ_SHOW
182 select GENERIC_IRQ_SHOW_LEVEL
183 select GENERIC_PCI_IOMAP if PCI
184 select GENERIC_PTDUMP
185 select GENERIC_SMP_IDLE_THREAD
186 select GENERIC_TIME_VSYSCALL
187 select GENERIC_VDSO_TIME_NS
188 select HAVE_ARCH_AUDITSYSCALL
189 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
190 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
191 select HAVE_ARCH_JUMP_LABEL
192 select HAVE_ARCH_JUMP_LABEL_RELATIVE
193 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
194 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
195 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
196 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
197 select HAVE_ARCH_KGDB
198 select HAVE_ARCH_MMAP_RND_BITS
199 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
200 select HAVE_ARCH_NVRAM_OPS
201 select HAVE_ARCH_SECCOMP_FILTER
202 select HAVE_ARCH_TRACEHOOK
203 select HAVE_ASM_MODVERSIONS
204 select HAVE_CONTEXT_TRACKING_USER if PPC64
205 select HAVE_C_RECORDMCOUNT
206 select HAVE_DEBUG_KMEMLEAK
207 select HAVE_DEBUG_STACKOVERFLOW
208 select HAVE_DYNAMIC_FTRACE
209 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
210 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
212 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
214 select HAVE_FTRACE_MCOUNT_RECORD
215 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
216 select HAVE_FUNCTION_ERROR_INJECTION
217 select HAVE_FUNCTION_GRAPH_TRACER
218 select HAVE_FUNCTION_TRACER
219 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
220 select HAVE_GENERIC_VDSO
221 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
222 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
223 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
224 select HAVE_IOREMAP_PROT
225 select HAVE_IRQ_TIME_ACCOUNTING
226 select HAVE_KERNEL_GZIP
227 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
228 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
229 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
231 select HAVE_KPROBES_ON_FTRACE
232 select HAVE_KRETPROBES
233 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
234 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
235 select HAVE_MOD_ARCH_SPECIFIC
236 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
237 select HAVE_OPTPROBES
238 select HAVE_PERF_EVENTS
239 select HAVE_PERF_EVENTS_NMI if PPC64
240 select HAVE_PERF_REGS
241 select HAVE_PERF_USER_STACK_DUMP
242 select HAVE_REGS_AND_STACK_ACCESS_API
243 select HAVE_RELIABLE_STACKTRACE
245 select HAVE_SETUP_PER_CPU_AREA if PPC64
246 select HAVE_SOFTIRQ_ON_OWN_STACK
247 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
248 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
249 select HAVE_STATIC_CALL if PPC32
250 select HAVE_SYSCALL_TRACEPOINTS
251 select HAVE_VIRT_CPU_ACCOUNTING
252 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
253 select IOMMU_HELPER if PPC64
255 select IRQ_FORCED_THREADING
256 select MMU_GATHER_PAGE_SIZE
257 select MMU_GATHER_RCU_TABLE_FREE
258 select MMU_GATHER_MERGE_VMAS
259 select MODULES_USE_ELF_RELA
260 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
261 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
262 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
263 select NEED_SG_DMA_LENGTH
265 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
266 select OF_EARLY_FLATTREE
267 select OLD_SIGACTION if PPC32
268 select OLD_SIGSUSPEND
269 select PCI_DOMAINS if PCI
270 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
271 select PCI_SYSCALL if PCI
272 select PPC_DAWR if PPC64
275 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
276 select SYSCTL_EXCEPTION_TRACE
277 select THREAD_INFO_IN_TASK
278 select TRACE_IRQFLAGS_SUPPORT
280 # Please keep this list sorted alphabetically.
283 config PPC_LONG_DOUBLE_128
285 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
287 config PPC_BARRIER_NOSPEC
290 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
301 bool "Enable support for 32bit binaries"
303 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
304 default y if !CPU_LITTLE_ENDIAN
305 select ARCH_WANT_OLD_COMPAT_IPC
306 select COMPAT_OLD_SIGACTION
308 config SCHED_OMIT_FRAME_POINTER
312 config ARCH_MAY_HAVE_PC_FDC
316 config PPC_UDBG_16550
319 config GENERIC_TBSYNC
321 default y if PPC32 && SMP
332 config GENERIC_BUG_RELATIVE_POINTERS
334 depends on GENERIC_BUG
336 config SYS_SUPPORTS_APM_EMULATION
337 default y if PMAC_APM_EMU
343 Used to allow a board to specify it wants an ePAPR compliant wrapper.
345 config DEFAULT_UIMAGE
348 Used to allow a board to specify it wants a uImage built by default
350 config ARCH_HIBERNATION_POSSIBLE
354 config ARCH_SUSPEND_POSSIBLE
356 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
357 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
360 config ARCH_SUSPEND_NONZERO_CPU
362 depends on PPC_POWERNV || PPC_PSERIES
364 config ARCH_HAS_ADD_PAGES
366 depends on ARCH_ENABLE_MEMORY_HOTPLUG
368 config PPC_DCR_NATIVE
376 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
379 config PPC_OF_PLATFORM_PCI
382 depends on PPC64 # not supported on 32 bits yet
384 config ARCH_SUPPORTS_UPROBES
387 config PPC_ADV_DEBUG_REGS
389 depends on 40x || BOOKE
392 config PPC_ADV_DEBUG_IACS
394 depends on PPC_ADV_DEBUG_REGS
398 config PPC_ADV_DEBUG_DACS
400 depends on PPC_ADV_DEBUG_REGS
403 config PPC_ADV_DEBUG_DVCS
405 depends on PPC_ADV_DEBUG_REGS
409 config PPC_ADV_DEBUG_DAC_RANGE
411 depends on PPC_ADV_DEBUG_REGS && 44x
417 config PGTABLE_LEVELS
422 source "arch/powerpc/sysdev/Kconfig"
423 source "arch/powerpc/platforms/Kconfig"
425 menu "Kernel options"
428 bool "High memory support"
432 source "kernel/Kconfig.hz"
434 config MATH_EMULATION
435 bool "Math emulation"
436 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
439 Some PowerPC chips designed for embedded applications do not have
440 a floating-point unit and therefore do not implement the
441 floating-point instructions in the PowerPC instruction set. If you
442 say Y here, the kernel will include code to emulate a floating-point
443 unit, which will allow programs that use floating-point
446 This is also useful to emulate missing (optional) instructions
447 such as fsqrt on cores that do have an FPU but do not implement
448 them (such as Freescale BookE).
451 prompt "Math emulation options"
452 default MATH_EMULATION_FULL
453 depends on MATH_EMULATION
455 config MATH_EMULATION_FULL
456 bool "Emulate all the floating point instructions"
458 Select this option will enable the kernel to support to emulate
459 all the floating point instructions. If your SoC doesn't have
460 a FPU, you should select this.
462 config MATH_EMULATION_HW_UNIMPLEMENTED
463 bool "Just emulate the FPU unimplemented instructions"
465 Select this if you know there does have a hardware FPU on your
466 SoC, but some floating point instructions are not implemented by that.
470 config PPC_TRANSACTIONAL_MEM
471 bool "Transactional Memory support for POWERPC"
472 depends on PPC_BOOK3S_64
477 Support user-mode Transactional Memory on POWERPC.
480 bool "Ultravisor support"
481 depends on KVM_BOOK3S_HV_POSSIBLE
482 depends on DEVICE_PRIVATE
485 This option paravirtualizes the kernel to run in POWER platforms that
486 supports the Protected Execution Facility (PEF). On such platforms,
487 the ultravisor firmware runs at a privilege level above the
492 config LD_HEAD_STUB_CATCH
493 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
496 Very large kernels can cause linker branch stubs to be generated by
497 code in head_64.S, which moves the head text sections out of their
498 specified location. This option can work around the problem.
502 config MPROFILE_KERNEL
503 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
504 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
507 bool "Support for enabling/disabling CPUs"
508 depends on SMP && (PPC_PSERIES || \
509 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
511 Say Y here to be able to disable and re-enable individual
512 CPUs at runtime on SMP machines.
514 Say N if you are unsure.
516 config PPC_QUEUED_SPINLOCKS
517 bool "Queued spinlocks" if EXPERT
519 default PPC_BOOK3S_64
521 Say Y here to use queued spinlocks which give better scalability and
522 fairness on large SMP and NUMA systems without harming single threaded
525 config ARCH_CPU_PROBE_RELEASE
527 depends on HOTPLUG_CPU
529 config PPC64_SUPPORTS_MEMORY_FAILURE
530 bool "Add support for memory hwpoison"
531 depends on PPC_BOOK3S_64
532 default "y" if PPC_POWERNV
533 select ARCH_SUPPORTS_MEMORY_FAILURE
536 bool "kexec system call"
537 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
540 kexec is a system call that implements the ability to shutdown your
541 current kernel, and to start another kernel. It is like a reboot
542 but it is independent of the system firmware. And like a reboot
543 you can start any kernel with it, not just Linux.
545 The name comes from the similarity to the exec system call.
547 It is an ongoing process to be certain the hardware in a machine
548 is properly shutdown, so do not be surprised if this code does not
549 initially work for you. As of this writing the exact hardware
550 interface is strongly in flux, so no good recommendation can be
554 bool "kexec file based system call"
556 select HAVE_IMA_KEXEC if IMA
561 depends on CRYPTO_SHA256=y
563 This is a new version of the kexec system call. This call is
564 file based and takes in file descriptors as system call arguments
565 for kernel and initramfs as opposed to a list of segments as is the
566 case for the older kexec call.
568 config ARCH_HAS_KEXEC_PURGATORY
572 bool "Build a relocatable kernel"
573 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
574 select NONSTATIC_KERNEL
576 This builds a kernel image that is capable of running at the
577 location the kernel is loaded at. For ppc32, there is no any
578 alignment restrictions, and this feature is a superset of
579 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
580 16k-aligned base address. The kernel is linked as a
581 position-independent executable (PIE) and contains dynamic relocations
582 which are processed early in the bootup process.
584 One use is for the kexec on panic case where the recovery kernel
585 must live at a different physical address than the primary
588 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
589 it has been loaded at and the compile time physical addresses
590 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
591 setting can still be useful to bootwrappers that need to know the
592 load address of the kernel (eg. u-boot/mkimage).
594 config RANDOMIZE_BASE
595 bool "Randomize the address of the kernel image"
596 depends on (FSL_BOOKE && FLATMEM && PPC32)
597 depends on RELOCATABLE
599 Randomizes the virtual address at which the kernel image is
600 loaded, as a security feature that deters exploit attempts
601 relying on knowledge of the location of kernel internals.
605 config RELOCATABLE_TEST
606 bool "Test relocatable kernel"
607 depends on (PPC64 && RELOCATABLE)
609 This runs the relocatable kernel at the address it was initially
610 loaded at, which tends to be non-zero and therefore test the
614 bool "Build a dump capture kernel"
615 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
616 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
618 Build a kernel suitable for use as a dump capture kernel.
619 The same kernel binary can be used as production kernel and dump
623 bool "Firmware-assisted dump"
624 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
628 A robust mechanism to get reliable kernel crash dump with
629 assistance from firmware. This approach does not use kexec,
630 instead firmware assists in booting the capture kernel
631 while preserving memory contents. Firmware-assisted dump
632 is meant to be a kdump replacement offering robustness and
633 speed not possible without system firmware assistance.
635 If unsure, say "y". Only special kernels like petitboot may
636 need to say "N" here.
638 config PRESERVE_FA_DUMP
639 bool "Preserve Firmware-assisted dump"
640 depends on PPC64 && PPC_POWERNV && !FA_DUMP
642 On a kernel with FA_DUMP disabled, this option helps to preserve
643 crash data from a previously crash'ed kernel. Useful when the next
644 memory preserving kernel boot would process this crash data.
645 Petitboot kernel is the typical usecase for this option.
648 bool "Export OPAL memory as /sys/firmware/opal/core"
649 depends on PPC64 && PPC_POWERNV
651 This option uses the MPIPL support in firmware to provide an
652 ELF core of OPAL memory after a crash. The ELF core is exported
653 as /sys/firmware/opal/core file which is helpful in debugging
654 OPAL crashes using GDB.
657 bool "Distribute interrupts on all CPUs by default"
660 This option gives the kernel permission to distribute IRQs across
661 multiple CPUs. Saying N here will route all IRQs to the first
662 CPU. Generally saying Y is safe, although some problems have been
663 reported with SMP Power Macintoshes with this option enabled.
666 bool "NUMA Memory Allocation and Scheduler Support"
667 depends on PPC64 && SMP
668 default y if PPC_PSERIES || PPC_POWERNV
669 select USE_PERCPU_NUMA_NODE_ID
671 Enable NUMA (Non-Uniform Memory Access) support.
673 The kernel will try to allocate memory used by a CPU on the
674 local memory controller of the CPU and add some more
675 NUMA awareness to the kernel.
683 config HAVE_MEMORYLESS_NODES
687 config ARCH_SELECT_MEMORY_MODEL
691 config ARCH_FLATMEM_ENABLE
693 depends on (PPC64 && !NUMA) || PPC32
695 config ARCH_SPARSEMEM_ENABLE
698 select SPARSEMEM_VMEMMAP_ENABLE
700 config ARCH_SPARSEMEM_DEFAULT
702 depends on PPC_BOOK3S_64
704 config ILLEGAL_POINTER_VALUE
706 # This is roughly half way between the top of user space and the bottom
707 # of kernel space, which seems about as good as we can get.
708 default 0x5deadbeef0000000 if PPC64
711 config ARCH_MEMORY_PROBE
713 depends on MEMORY_HOTPLUG
717 default PPC_64K_PAGES if PPC_BOOK3S_64
720 Select the kernel logical page size. Increasing the page size
721 will reduce software overhead at each page boundary, allow
722 hardware prefetch mechanisms to be more effective, and allow
723 larger dma transfers increasing IO efficiency and reducing
724 overhead. However the utilization of memory will increase.
725 For example, each cached file will using a multiple of the
726 page size to hold its contents and the difference between the
727 end of file and the end of page is wasted.
729 Some dedicated systems, such as software raid serving with
730 accelerated calculations, have shown significant increases.
732 If you configure a 64 bit kernel for 64k pages but the
733 processor does not support them, then the kernel will simulate
734 them with 4k pages, loading them on demand, but with the
735 reduced software overhead and larger internal fragmentation.
736 For the 32 bit kernel, a large page option will not be offered
737 unless it is supported by the configured processor.
739 If unsure, choose 4K_PAGES.
743 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
747 depends on 44x || PPC_8xx
751 depends on 44x || PPC_BOOK3S_64
752 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
754 config PPC_256K_PAGES
755 bool "256k page size (Requires non-standard binutils settings)"
756 depends on 44x && !PPC_47x
758 Make the page size 256k.
760 The kernel will only be able to run applications that have been
761 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
762 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
763 definition from 0x10000 to 0x40000 in older versions.
769 depends on PPC_4K_PAGES
771 config PAGE_SIZE_16KB
773 depends on PPC_16K_PAGES
775 config PAGE_SIZE_64KB
777 depends on PPC_64K_PAGES
779 config PAGE_SIZE_256KB
781 depends on PPC_256K_PAGES
783 config PPC_PAGE_SHIFT
785 default 18 if PPC_256K_PAGES
786 default 16 if PPC_64K_PAGES
787 default 14 if PPC_16K_PAGES
791 int "Thread shift" if EXPERT
793 default "15" if PPC_256K_PAGES
794 default "14" if PPC64
797 Used to define the stack size. The default is almost always what you
798 want. Only change this if you know what you are doing.
800 config DATA_SHIFT_BOOL
801 bool "Set custom data alignment"
802 depends on ADVANCED_OPTIONS
803 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
804 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
807 This option allows you to set the kernel data alignment. When
808 RAM is mapped by blocks, the alignment needs to fit the size and
809 number of possible blocks. The default should be OK for most configs.
811 Say N here unless you know what you are doing.
814 int "Data shift" if DATA_SHIFT_BOOL
815 default 24 if STRICT_KERNEL_RWX && PPC64
816 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
817 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
818 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
819 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
820 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
821 default 23 if STRICT_KERNEL_RWX && PPC_8xx
822 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
823 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
824 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
825 default PPC_PAGE_SHIFT
827 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
828 Smaller is the alignment, greater is the number of necessary DBATs.
830 On 8xx, large pages (512kb or 8M) are used to map kernel linear
831 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
832 in that case. If PIN_TLB is selected, it must be aligned to 8M as
833 8M pages will be pinned.
835 config FORCE_MAX_ZONEORDER
836 int "Maximum zone order"
837 range 8 9 if PPC64 && PPC_64K_PAGES
838 default "9" if PPC64 && PPC_64K_PAGES
839 range 13 13 if PPC64 && !PPC_64K_PAGES
840 default "13" if PPC64 && !PPC_64K_PAGES
841 range 9 64 if PPC32 && PPC_16K_PAGES
842 default "9" if PPC32 && PPC_16K_PAGES
843 range 7 64 if PPC32 && PPC_64K_PAGES
844 default "7" if PPC32 && PPC_64K_PAGES
845 range 5 64 if PPC32 && PPC_256K_PAGES
846 default "5" if PPC32 && PPC_256K_PAGES
850 The kernel memory allocator divides physically contiguous memory
851 blocks into "zones", where each zone is a power of two number of
852 pages. This option selects the largest power of two that the kernel
853 keeps in the memory allocator. If you need to allocate very large
854 blocks of physically contiguous memory, then you may need to
857 This config option is actually maximum order plus one. For example,
858 a value of 11 means that the largest free memory block is 2^10 pages.
860 The page size is not necessarily 4KB. For example, on 64-bit
861 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
862 this in mind when choosing a value for this option.
864 config PPC_SUBPAGE_PROT
865 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
867 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
869 This option adds support for system call to allow user programs
870 to set access permissions (read/write, readonly, or no access)
871 on the 4k subpages of each 64k page.
873 If unsure, say N here.
875 config PPC_PROT_SAO_LPAR
876 bool "Support PROT_SAO mappings in LPARs"
877 depends on PPC_BOOK3S_64
879 This option adds support for PROT_SAO mappings from userspace
880 inside LPARs on supported CPUs.
882 This may cause issues when performing guest migration from
883 a CPU that supports SAO to one that does not.
885 If unsure, say N here.
887 config PPC_COPRO_BASE
891 bool "SMT (Hyperthreading) scheduler support"
892 depends on PPC64 && SMP
894 SMT scheduler support improves the CPU scheduler's decision making
895 when dealing with POWER5 cpus at a cost of slightly increased
896 overhead in some places. If unsure say N here.
898 config PPC_DENORMALISATION
899 bool "PowerPC denormalisation exception handling"
900 depends on PPC_BOOK3S_64
901 default "y" if PPC_POWERNV
903 Add support for handling denormalisation of single precision
904 values. Useful for bare metal only. If unsure say Y here.
907 string "Initial kernel command string"
910 On some platforms, there is currently no way for the boot loader to
911 pass arguments to the kernel. For these platforms, you can supply
912 some command-line options at build time by entering them here. In
913 most cases you will need to specify the root device here.
916 prompt "Kernel command line type" if CMDLINE != ""
917 default CMDLINE_FROM_BOOTLOADER
919 config CMDLINE_FROM_BOOTLOADER
920 bool "Use bootloader kernel arguments if available"
922 Uses the command-line options passed by the boot loader. If
923 the boot loader doesn't provide any, the default kernel command
924 string provided in CMDLINE will be used.
926 config CMDLINE_EXTEND
927 bool "Extend bootloader kernel arguments"
929 The command-line arguments provided by the boot loader will be
930 appended to the default kernel command string.
933 bool "Always use the default kernel command string"
935 Always use the default kernel command string, even if the boot
936 loader passes other arguments to the kernel.
937 This is useful if you cannot or don't want to change the
938 command-line options your boot loader passes to the kernel.
943 string "Additional default image types"
945 List additional targets to be built by the bootwrapper here (separated
946 by spaces). This is useful for targets that depend of device tree
947 files in the .dts directory.
949 Targets in this list will be build as part of the default build
950 target, or when the user does a 'make zImage' or a
951 'make zImage.initrd'.
953 If unsure, leave blank
955 config ARCH_WANTS_FREEZER_CONTROL
959 source "kernel/power/Kconfig"
962 prompt "PowerPC Memory Protection Keys"
964 depends on PPC_BOOK3S_64
965 depends on PPC_64S_HASH_MMU
966 select ARCH_USES_HIGH_VMA_FLAGS
967 select ARCH_HAS_PKEYS
969 Memory Protection Keys provides a mechanism for enforcing
970 page-based protections, but without requiring modification of the
971 page tables when an application changes protection domains.
973 For details, see Documentation/core-api/protection-keys.rst
977 config PPC_SECURE_BOOT
978 prompt "Enable secure boot support"
980 depends on PPC_POWERNV || PPC_PSERIES
981 depends on IMA_ARCH_POLICY
982 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
984 Systems with firmware secure boot enabled need to define security
985 policies to extend secure boot to the OS. This config allows a user
986 to enable OS secure boot on systems that have firmware support for
987 it. If in doubt say N.
989 config PPC_SECVAR_SYSFS
990 bool "Enable sysfs interface for POWER secure variables"
992 depends on PPC_SECURE_BOOT
995 POWER secure variables are managed and controlled by firmware.
996 These variables are exposed to userspace via sysfs to enable
997 read/write operations on these variables. Say Y if you have
998 secure boot enabled and want to expose variables to userspace.
1000 config PPC_RTAS_FILTER
1001 bool "Enable filtering of RTAS syscalls"
1005 The RTAS syscall API has security issues that could be used to
1006 compromise system integrity. This option enforces restrictions on the
1007 RTAS calls and arguments passed by userspace programs to mitigate
1010 Say Y unless you know what you are doing and the filter is causing
1022 bool "Support for ISA-bus hardware"
1026 Find out whether you have ISA slots on your motherboard. ISA is the
1027 name of a bus system, i.e. the way the CPU talks to the other stuff
1028 inside your box. If you have an Apple machine, say N here; if you
1029 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1030 embedded board, consult your board documentation.
1032 config GENERIC_ISA_DMA
1034 depends on ISA_DMA_API
1037 config PPC_INDIRECT_PCI
1040 default y if 40x || 44x
1050 select ARCH_HAS_DMA_SET_MASK
1051 select PPC_INDIRECT_PCI
1057 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1059 Freescale MPC85xx/MPC86xx power management controller support
1060 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1065 depends on SUSPEND && (44x || 40x)
1067 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1068 It also enables support for two different idle states (idle-wait
1075 bool "Freescale Local Bus support"
1077 Enables reporting of errors from the Freescale local bus
1078 controller. Also contains some common code used by
1079 drivers for specific local bus peripherals.
1083 depends on PPC_83xx || QUICC_ENGINE || CPM2
1085 Freescale General-purpose Timers support
1089 depends on PCI && 8260
1090 select PPC_INDIRECT_PCI
1094 bool "Freescale Embedded SRIO Controller support"
1095 depends on RAPIDIO = y && HAVE_RAPIDIO
1098 Include support for RapidIO controller on Freescale embedded
1099 processors (MPC8548, MPC8641, etc).
1103 config NONSTATIC_KERNEL
1106 menu "Advanced setup"
1109 config ADVANCED_OPTIONS
1110 bool "Prompt for advanced kernel configuration options"
1112 This option will enable prompting for a variety of advanced kernel
1113 configuration options. These options can cause the kernel to not
1114 work if they are set incorrectly, but can be used to optimize certain
1115 aspects of kernel memory management.
1117 Unless you know what you are doing, say N here.
1119 comment "Default settings for advanced configuration options are used"
1120 depends on !ADVANCED_OPTIONS
1122 config LOWMEM_SIZE_BOOL
1123 bool "Set maximum low memory"
1124 depends on ADVANCED_OPTIONS
1126 This option allows you to set the maximum amount of memory which
1127 will be used as "low memory", that is, memory which the kernel can
1128 access directly, without having to set up a kernel virtual mapping.
1129 This can be useful in optimizing the layout of kernel virtual
1132 Say N here unless you know what you are doing.
1135 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1136 default "0x30000000"
1138 config LOWMEM_CAM_NUM_BOOL
1139 bool "Set number of CAMs to use to map low memory"
1140 depends on ADVANCED_OPTIONS && FSL_BOOKE
1142 This option allows you to set the maximum number of CAM slots that
1143 will be used to map low memory. There are a limited number of slots
1144 available and even more limited number that will fit in the L1 MMU.
1145 However, using more entries will allow mapping more low memory. This
1146 can be useful in optimizing the layout of kernel virtual memory.
1148 Say N here unless you know what you are doing.
1150 config LOWMEM_CAM_NUM
1151 depends on FSL_BOOKE
1152 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1153 default 3 if !STRICT_KERNEL_RWX
1154 default 9 if DATA_SHIFT >= 24
1155 default 12 if DATA_SHIFT >= 22
1158 config DYNAMIC_MEMSTART
1159 bool "Enable page aligned dynamic load address for kernel"
1160 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1161 select NONSTATIC_KERNEL
1163 This option enables the kernel to be loaded at any page aligned
1164 physical address. The kernel creates a mapping from KERNELBASE to
1165 the address where the kernel is loaded. The page size here implies
1166 the TLB page size of the mapping for kernel on the particular platform.
1167 Please refer to the init code for finding the TLB page size.
1169 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1170 kernel image, where the only restriction is the page aligned kernel
1171 load address. When this option is enabled, the compile time physical
1172 address CONFIG_PHYSICAL_START is ignored.
1174 This option is overridden by CONFIG_RELOCATABLE
1176 config PAGE_OFFSET_BOOL
1177 bool "Set custom page offset address"
1178 depends on ADVANCED_OPTIONS
1180 This option allows you to set the kernel virtual address at which
1181 the kernel will map low memory. This can be useful in optimizing
1182 the virtual memory layout of the system.
1184 Say N here unless you know what you are doing.
1187 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1188 default "0xc0000000"
1190 config KERNEL_START_BOOL
1191 bool "Set custom kernel base address"
1192 depends on ADVANCED_OPTIONS
1194 This option allows you to set the kernel virtual address at which
1195 the kernel will be loaded. Normally this should match PAGE_OFFSET
1196 however there are times (like kdump) that one might not want them
1199 Say N here unless you know what you are doing.
1202 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1203 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1204 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1205 default "0xc0000000"
1207 config PHYSICAL_START_BOOL
1208 bool "Set physical address where the kernel is loaded"
1209 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1211 This gives the physical address where the kernel is loaded.
1213 Say N here unless you know what you are doing.
1215 config PHYSICAL_START
1216 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1217 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1218 default "0x00000000"
1220 config PHYSICAL_ALIGN
1222 default "0x04000000" if FSL_BOOKE
1224 This value puts the alignment restrictions on physical address
1225 where kernel is loaded and run from. Kernel is compiled for an
1226 address which meets above alignment restriction.
1228 config TASK_SIZE_BOOL
1229 bool "Set custom user task size"
1230 depends on ADVANCED_OPTIONS
1232 This option allows you to set the amount of virtual address space
1233 allocated to user tasks. This can be useful in optimizing the
1234 virtual memory layout of the system.
1236 Say N here unless you know what you are doing.
1239 hex "Size of user task space" if TASK_SIZE_BOOL
1240 default "0x80000000" if PPC_8xx
1241 default "0xb0000000" if PPC_BOOK3S_32
1242 default "0xc0000000"
1246 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1249 default "0xc000000000000000"
1252 default "0xc000000000000000"
1253 config PHYSICAL_START
1255 default "0x00000000"
1258 config PPC_LIB_RHEAP
1261 source "arch/powerpc/kvm/Kconfig"
1263 source "kernel/livepatch/Kconfig"