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_HAS_VM_GET_PAGE_PROT if PPC_BOOK3S_64
144 select ARCH_HAVE_NMI_SAFE_CMPXCHG
145 select ARCH_KEEP_MEMBLOCK
146 select ARCH_MIGHT_HAVE_PC_PARPORT
147 select ARCH_MIGHT_HAVE_PC_SERIO
148 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
149 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
150 select ARCH_STACKWALK
151 select ARCH_SUPPORTS_ATOMIC_RMW
152 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
153 select ARCH_USE_BUILTIN_BSWAP
154 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
155 select ARCH_USE_MEMTEST
156 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
157 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
158 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
159 select ARCH_WANT_IPC_PARSE_VERSION
160 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
161 select ARCH_WANT_LD_ORPHAN_WARN
162 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
163 select ARCH_WANTS_NO_INSTR
164 select ARCH_WEAK_RELEASE_ACQUIRE
166 select BUILDTIME_TABLE_SORT
167 select CLONE_BACKWARDS
168 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
169 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
170 select DMA_OPS_BYPASS if PPC64
171 select DMA_OPS if PPC64
172 select DYNAMIC_FTRACE if FUNCTION_TRACER
173 select EDAC_ATOMIC_SCRUB
175 select GENERIC_ATOMIC64 if PPC32
176 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
177 select GENERIC_CMOS_UPDATE
178 select GENERIC_CPU_AUTOPROBE
179 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
180 select GENERIC_EARLY_IOREMAP
181 select GENERIC_GETTIMEOFDAY
182 select GENERIC_IRQ_SHOW
183 select GENERIC_IRQ_SHOW_LEVEL
184 select GENERIC_PCI_IOMAP if PCI
185 select GENERIC_PTDUMP
186 select GENERIC_SMP_IDLE_THREAD
187 select GENERIC_TIME_VSYSCALL
188 select GENERIC_VDSO_TIME_NS
189 select HAVE_ARCH_AUDITSYSCALL
190 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
191 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
192 select HAVE_ARCH_JUMP_LABEL
193 select HAVE_ARCH_JUMP_LABEL_RELATIVE
194 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
195 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
196 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
197 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
198 select HAVE_ARCH_KGDB
199 select HAVE_ARCH_MMAP_RND_BITS
200 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
201 select HAVE_ARCH_NVRAM_OPS
202 select HAVE_ARCH_SECCOMP_FILTER
203 select HAVE_ARCH_TRACEHOOK
204 select HAVE_ASM_MODVERSIONS
205 select HAVE_CONTEXT_TRACKING if PPC64
206 select HAVE_C_RECORDMCOUNT
207 select HAVE_DEBUG_KMEMLEAK
208 select HAVE_DEBUG_STACKOVERFLOW
209 select HAVE_DYNAMIC_FTRACE
210 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
211 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
213 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
215 select HAVE_FTRACE_MCOUNT_RECORD
216 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
217 select HAVE_FUNCTION_ERROR_INJECTION
218 select HAVE_FUNCTION_GRAPH_TRACER
219 select HAVE_FUNCTION_TRACER
220 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
221 select HAVE_GENERIC_VDSO
222 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
223 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
224 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
225 select HAVE_IOREMAP_PROT
226 select HAVE_IRQ_EXIT_ON_IRQ_STACK
227 select HAVE_IRQ_TIME_ACCOUNTING
228 select HAVE_KERNEL_GZIP
229 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
230 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
231 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
233 select HAVE_KPROBES_ON_FTRACE
234 select HAVE_KRETPROBES
235 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
236 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
237 select HAVE_MOD_ARCH_SPECIFIC
238 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
239 select HAVE_OPTPROBES
240 select HAVE_PERF_EVENTS
241 select HAVE_PERF_EVENTS_NMI if PPC64
242 select HAVE_PERF_REGS
243 select HAVE_PERF_USER_STACK_DUMP
244 select HAVE_REGS_AND_STACK_ACCESS_API
245 select HAVE_RELIABLE_STACKTRACE
247 select HAVE_SETUP_PER_CPU_AREA if PPC64
248 select HAVE_SOFTIRQ_ON_OWN_STACK
249 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
250 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
251 select HAVE_STATIC_CALL if PPC32
252 select HAVE_SYSCALL_TRACEPOINTS
253 select HAVE_VIRT_CPU_ACCOUNTING
254 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
255 select IOMMU_HELPER if PPC64
257 select IRQ_FORCED_THREADING
258 select MMU_GATHER_PAGE_SIZE
259 select MMU_GATHER_RCU_TABLE_FREE
260 select MODULES_USE_ELF_RELA
261 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
262 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
263 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
264 select NEED_SG_DMA_LENGTH
266 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
267 select OF_EARLY_FLATTREE
268 select OLD_SIGACTION if PPC32
269 select OLD_SIGSUSPEND
270 select PCI_DOMAINS if PCI
271 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
272 select PCI_SYSCALL if PCI
273 select PPC_DAWR if PPC64
276 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
277 select SYSCTL_EXCEPTION_TRACE
278 select THREAD_INFO_IN_TASK
279 select TRACE_IRQFLAGS_SUPPORT
280 select VIRT_TO_BUS if !PPC64
282 # Please keep this list sorted alphabetically.
285 config PPC_BARRIER_NOSPEC
288 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
299 bool "Enable support for 32bit binaries"
301 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
302 default y if !CPU_LITTLE_ENDIAN
303 select ARCH_WANT_OLD_COMPAT_IPC
304 select COMPAT_OLD_SIGACTION
306 config SCHED_OMIT_FRAME_POINTER
310 config ARCH_MAY_HAVE_PC_FDC
314 config PPC_UDBG_16550
317 config GENERIC_TBSYNC
319 default y if PPC32 && SMP
330 config GENERIC_BUG_RELATIVE_POINTERS
332 depends on GENERIC_BUG
334 config SYS_SUPPORTS_APM_EMULATION
335 default y if PMAC_APM_EMU
341 Used to allow a board to specify it wants an ePAPR compliant wrapper.
343 config DEFAULT_UIMAGE
346 Used to allow a board to specify it wants a uImage built by default
348 config ARCH_HIBERNATION_POSSIBLE
352 config ARCH_SUSPEND_POSSIBLE
354 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
355 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
358 config ARCH_SUSPEND_NONZERO_CPU
360 depends on PPC_POWERNV || PPC_PSERIES
362 config PPC_DCR_NATIVE
370 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
373 config PPC_OF_PLATFORM_PCI
376 depends on PPC64 # not supported on 32 bits yet
378 config ARCH_SUPPORTS_UPROBES
381 config PPC_ADV_DEBUG_REGS
383 depends on 40x || BOOKE
386 config PPC_ADV_DEBUG_IACS
388 depends on PPC_ADV_DEBUG_REGS
392 config PPC_ADV_DEBUG_DACS
394 depends on PPC_ADV_DEBUG_REGS
397 config PPC_ADV_DEBUG_DVCS
399 depends on PPC_ADV_DEBUG_REGS
403 config PPC_ADV_DEBUG_DAC_RANGE
405 depends on PPC_ADV_DEBUG_REGS && 44x
411 config PGTABLE_LEVELS
416 source "arch/powerpc/sysdev/Kconfig"
417 source "arch/powerpc/platforms/Kconfig"
419 menu "Kernel options"
422 bool "High memory support"
426 source "kernel/Kconfig.hz"
428 config MATH_EMULATION
429 bool "Math emulation"
430 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
433 Some PowerPC chips designed for embedded applications do not have
434 a floating-point unit and therefore do not implement the
435 floating-point instructions in the PowerPC instruction set. If you
436 say Y here, the kernel will include code to emulate a floating-point
437 unit, which will allow programs that use floating-point
440 This is also useful to emulate missing (optional) instructions
441 such as fsqrt on cores that do have an FPU but do not implement
442 them (such as Freescale BookE).
445 prompt "Math emulation options"
446 default MATH_EMULATION_FULL
447 depends on MATH_EMULATION
449 config MATH_EMULATION_FULL
450 bool "Emulate all the floating point instructions"
452 Select this option will enable the kernel to support to emulate
453 all the floating point instructions. If your SoC doesn't have
454 a FPU, you should select this.
456 config MATH_EMULATION_HW_UNIMPLEMENTED
457 bool "Just emulate the FPU unimplemented instructions"
459 Select this if you know there does have a hardware FPU on your
460 SoC, but some floating point instructions are not implemented by that.
464 config PPC_TRANSACTIONAL_MEM
465 bool "Transactional Memory support for POWERPC"
466 depends on PPC_BOOK3S_64
471 Support user-mode Transactional Memory on POWERPC.
474 bool "Ultravisor support"
475 depends on KVM_BOOK3S_HV_POSSIBLE
476 depends on DEVICE_PRIVATE
479 This option paravirtualizes the kernel to run in POWER platforms that
480 supports the Protected Execution Facility (PEF). On such platforms,
481 the ultravisor firmware runs at a privilege level above the
486 config LD_HEAD_STUB_CATCH
487 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
490 Very large kernels can cause linker branch stubs to be generated by
491 code in head_64.S, which moves the head text sections out of their
492 specified location. This option can work around the problem.
496 config MPROFILE_KERNEL
497 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
498 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
501 bool "Support for enabling/disabling CPUs"
502 depends on SMP && (PPC_PSERIES || \
503 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
505 Say Y here to be able to disable and re-enable individual
506 CPUs at runtime on SMP machines.
508 Say N if you are unsure.
510 config PPC_QUEUED_SPINLOCKS
511 bool "Queued spinlocks" if EXPERT
513 default PPC_BOOK3S_64
515 Say Y here to use queued spinlocks which give better scalability and
516 fairness on large SMP and NUMA systems without harming single threaded
519 config ARCH_CPU_PROBE_RELEASE
521 depends on HOTPLUG_CPU
523 config PPC64_SUPPORTS_MEMORY_FAILURE
524 bool "Add support for memory hwpoison"
525 depends on PPC_BOOK3S_64
526 default "y" if PPC_POWERNV
527 select ARCH_SUPPORTS_MEMORY_FAILURE
530 bool "kexec system call"
531 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
534 kexec is a system call that implements the ability to shutdown your
535 current kernel, and to start another kernel. It is like a reboot
536 but it is independent of the system firmware. And like a reboot
537 you can start any kernel with it, not just Linux.
539 The name comes from the similarity to the exec system call.
541 It is an ongoing process to be certain the hardware in a machine
542 is properly shutdown, so do not be surprised if this code does not
543 initially work for you. As of this writing the exact hardware
544 interface is strongly in flux, so no good recommendation can be
548 bool "kexec file based system call"
550 select HAVE_IMA_KEXEC if IMA
555 depends on CRYPTO_SHA256=y
557 This is a new version of the kexec system call. This call is
558 file based and takes in file descriptors as system call arguments
559 for kernel and initramfs as opposed to a list of segments as is the
560 case for the older kexec call.
562 config ARCH_HAS_KEXEC_PURGATORY
566 bool "Build a relocatable kernel"
567 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
568 select NONSTATIC_KERNEL
570 This builds a kernel image that is capable of running at the
571 location the kernel is loaded at. For ppc32, there is no any
572 alignment restrictions, and this feature is a superset of
573 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
574 16k-aligned base address. The kernel is linked as a
575 position-independent executable (PIE) and contains dynamic relocations
576 which are processed early in the bootup process.
578 One use is for the kexec on panic case where the recovery kernel
579 must live at a different physical address than the primary
582 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
583 it has been loaded at and the compile time physical addresses
584 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
585 setting can still be useful to bootwrappers that need to know the
586 load address of the kernel (eg. u-boot/mkimage).
588 config RANDOMIZE_BASE
589 bool "Randomize the address of the kernel image"
590 depends on (FSL_BOOKE && FLATMEM && PPC32)
591 depends on RELOCATABLE
593 Randomizes the virtual address at which the kernel image is
594 loaded, as a security feature that deters exploit attempts
595 relying on knowledge of the location of kernel internals.
599 config RELOCATABLE_TEST
600 bool "Test relocatable kernel"
601 depends on (PPC64 && RELOCATABLE)
603 This runs the relocatable kernel at the address it was initially
604 loaded at, which tends to be non-zero and therefore test the
608 bool "Build a dump capture kernel"
609 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
610 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
612 Build a kernel suitable for use as a dump capture kernel.
613 The same kernel binary can be used as production kernel and dump
617 bool "Firmware-assisted dump"
618 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
622 A robust mechanism to get reliable kernel crash dump with
623 assistance from firmware. This approach does not use kexec,
624 instead firmware assists in booting the capture kernel
625 while preserving memory contents. Firmware-assisted dump
626 is meant to be a kdump replacement offering robustness and
627 speed not possible without system firmware assistance.
629 If unsure, say "y". Only special kernels like petitboot may
630 need to say "N" here.
632 config PRESERVE_FA_DUMP
633 bool "Preserve Firmware-assisted dump"
634 depends on PPC64 && PPC_POWERNV && !FA_DUMP
636 On a kernel with FA_DUMP disabled, this option helps to preserve
637 crash data from a previously crash'ed kernel. Useful when the next
638 memory preserving kernel boot would process this crash data.
639 Petitboot kernel is the typical usecase for this option.
642 bool "Export OPAL memory as /sys/firmware/opal/core"
643 depends on PPC64 && PPC_POWERNV
645 This option uses the MPIPL support in firmware to provide an
646 ELF core of OPAL memory after a crash. The ELF core is exported
647 as /sys/firmware/opal/core file which is helpful in debugging
648 OPAL crashes using GDB.
651 bool "Distribute interrupts on all CPUs by default"
654 This option gives the kernel permission to distribute IRQs across
655 multiple CPUs. Saying N here will route all IRQs to the first
656 CPU. Generally saying Y is safe, although some problems have been
657 reported with SMP Power Macintoshes with this option enabled.
660 bool "NUMA Memory Allocation and Scheduler Support"
661 depends on PPC64 && SMP
662 default y if PPC_PSERIES || PPC_POWERNV
663 select USE_PERCPU_NUMA_NODE_ID
665 Enable NUMA (Non-Uniform Memory Access) support.
667 The kernel will try to allocate memory used by a CPU on the
668 local memory controller of the CPU and add some more
669 NUMA awareness to the kernel.
677 config HAVE_MEMORYLESS_NODES
681 config ARCH_SELECT_MEMORY_MODEL
685 config ARCH_FLATMEM_ENABLE
687 depends on (PPC64 && !NUMA) || PPC32
689 config ARCH_SPARSEMEM_ENABLE
692 select SPARSEMEM_VMEMMAP_ENABLE
694 config ARCH_SPARSEMEM_DEFAULT
696 depends on PPC_BOOK3S_64
698 config ILLEGAL_POINTER_VALUE
700 # This is roughly half way between the top of user space and the bottom
701 # of kernel space, which seems about as good as we can get.
702 default 0x5deadbeef0000000 if PPC64
705 config ARCH_MEMORY_PROBE
707 depends on MEMORY_HOTPLUG
711 default PPC_64K_PAGES if PPC_BOOK3S_64
714 Select the kernel logical page size. Increasing the page size
715 will reduce software overhead at each page boundary, allow
716 hardware prefetch mechanisms to be more effective, and allow
717 larger dma transfers increasing IO efficiency and reducing
718 overhead. However the utilization of memory will increase.
719 For example, each cached file will using a multiple of the
720 page size to hold its contents and the difference between the
721 end of file and the end of page is wasted.
723 Some dedicated systems, such as software raid serving with
724 accelerated calculations, have shown significant increases.
726 If you configure a 64 bit kernel for 64k pages but the
727 processor does not support them, then the kernel will simulate
728 them with 4k pages, loading them on demand, but with the
729 reduced software overhead and larger internal fragmentation.
730 For the 32 bit kernel, a large page option will not be offered
731 unless it is supported by the configured processor.
733 If unsure, choose 4K_PAGES.
737 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
741 depends on 44x || PPC_8xx
745 depends on 44x || PPC_BOOK3S_64
746 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
748 config PPC_256K_PAGES
749 bool "256k page size (Requires non-standard binutils settings)"
750 depends on 44x && !PPC_47x
752 Make the page size 256k.
754 The kernel will only be able to run applications that have been
755 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
756 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
757 definition from 0x10000 to 0x40000 in older versions.
763 depends on PPC_4K_PAGES
765 config PAGE_SIZE_16KB
767 depends on PPC_16K_PAGES
769 config PAGE_SIZE_64KB
771 depends on PPC_64K_PAGES
773 config PAGE_SIZE_256KB
775 depends on PPC_256K_PAGES
777 config PPC_PAGE_SHIFT
779 default 18 if PPC_256K_PAGES
780 default 16 if PPC_64K_PAGES
781 default 14 if PPC_16K_PAGES
785 int "Thread shift" if EXPERT
787 default "15" if PPC_256K_PAGES
788 default "14" if PPC64
789 default "14" if KASAN
792 Used to define the stack size. The default is almost always what you
793 want. Only change this if you know what you are doing.
795 config DATA_SHIFT_BOOL
796 bool "Set custom data alignment"
797 depends on ADVANCED_OPTIONS
798 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
799 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
802 This option allows you to set the kernel data alignment. When
803 RAM is mapped by blocks, the alignment needs to fit the size and
804 number of possible blocks. The default should be OK for most configs.
806 Say N here unless you know what you are doing.
809 int "Data shift" if DATA_SHIFT_BOOL
810 default 24 if STRICT_KERNEL_RWX && PPC64
811 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
812 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
813 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
814 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
815 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
816 default 23 if STRICT_KERNEL_RWX && PPC_8xx
817 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
818 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
819 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
820 default PPC_PAGE_SHIFT
822 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
823 Smaller is the alignment, greater is the number of necessary DBATs.
825 On 8xx, large pages (512kb or 8M) are used to map kernel linear
826 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
827 in that case. If PIN_TLB is selected, it must be aligned to 8M as
828 8M pages will be pinned.
830 config FORCE_MAX_ZONEORDER
831 int "Maximum zone order"
832 range 8 9 if PPC64 && PPC_64K_PAGES
833 default "9" if PPC64 && PPC_64K_PAGES
834 range 13 13 if PPC64 && !PPC_64K_PAGES
835 default "13" if PPC64 && !PPC_64K_PAGES
836 range 9 64 if PPC32 && PPC_16K_PAGES
837 default "9" if PPC32 && PPC_16K_PAGES
838 range 7 64 if PPC32 && PPC_64K_PAGES
839 default "7" if PPC32 && PPC_64K_PAGES
840 range 5 64 if PPC32 && PPC_256K_PAGES
841 default "5" if PPC32 && PPC_256K_PAGES
845 The kernel memory allocator divides physically contiguous memory
846 blocks into "zones", where each zone is a power of two number of
847 pages. This option selects the largest power of two that the kernel
848 keeps in the memory allocator. If you need to allocate very large
849 blocks of physically contiguous memory, then you may need to
852 This config option is actually maximum order plus one. For example,
853 a value of 11 means that the largest free memory block is 2^10 pages.
855 The page size is not necessarily 4KB. For example, on 64-bit
856 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
857 this in mind when choosing a value for this option.
859 config PPC_SUBPAGE_PROT
860 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
862 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
864 This option adds support for system call to allow user programs
865 to set access permissions (read/write, readonly, or no access)
866 on the 4k subpages of each 64k page.
868 If unsure, say N here.
870 config PPC_PROT_SAO_LPAR
871 bool "Support PROT_SAO mappings in LPARs"
872 depends on PPC_BOOK3S_64
874 This option adds support for PROT_SAO mappings from userspace
875 inside LPARs on supported CPUs.
877 This may cause issues when performing guest migration from
878 a CPU that supports SAO to one that does not.
880 If unsure, say N here.
882 config PPC_COPRO_BASE
886 bool "SMT (Hyperthreading) scheduler support"
887 depends on PPC64 && SMP
889 SMT scheduler support improves the CPU scheduler's decision making
890 when dealing with POWER5 cpus at a cost of slightly increased
891 overhead in some places. If unsure say N here.
893 config PPC_DENORMALISATION
894 bool "PowerPC denormalisation exception handling"
895 depends on PPC_BOOK3S_64
896 default "y" if PPC_POWERNV
898 Add support for handling denormalisation of single precision
899 values. Useful for bare metal only. If unsure say Y here.
902 string "Initial kernel command string"
905 On some platforms, there is currently no way for the boot loader to
906 pass arguments to the kernel. For these platforms, you can supply
907 some command-line options at build time by entering them here. In
908 most cases you will need to specify the root device here.
911 prompt "Kernel command line type" if CMDLINE != ""
912 default CMDLINE_FROM_BOOTLOADER
914 config CMDLINE_FROM_BOOTLOADER
915 bool "Use bootloader kernel arguments if available"
917 Uses the command-line options passed by the boot loader. If
918 the boot loader doesn't provide any, the default kernel command
919 string provided in CMDLINE will be used.
921 config CMDLINE_EXTEND
922 bool "Extend bootloader kernel arguments"
924 The command-line arguments provided by the boot loader will be
925 appended to the default kernel command string.
928 bool "Always use the default kernel command string"
930 Always use the default kernel command string, even if the boot
931 loader passes other arguments to the kernel.
932 This is useful if you cannot or don't want to change the
933 command-line options your boot loader passes to the kernel.
938 string "Additional default image types"
940 List additional targets to be built by the bootwrapper here (separated
941 by spaces). This is useful for targets that depend of device tree
942 files in the .dts directory.
944 Targets in this list will be build as part of the default build
945 target, or when the user does a 'make zImage' or a
946 'make zImage.initrd'.
948 If unsure, leave blank
950 config ARCH_WANTS_FREEZER_CONTROL
954 source "kernel/power/Kconfig"
957 prompt "PowerPC Memory Protection Keys"
959 depends on PPC_BOOK3S_64
960 depends on PPC_64S_HASH_MMU
961 select ARCH_USES_HIGH_VMA_FLAGS
962 select ARCH_HAS_PKEYS
964 Memory Protection Keys provides a mechanism for enforcing
965 page-based protections, but without requiring modification of the
966 page tables when an application changes protection domains.
968 For details, see Documentation/core-api/protection-keys.rst
972 config PPC_SECURE_BOOT
973 prompt "Enable secure boot support"
975 depends on PPC_POWERNV || PPC_PSERIES
976 depends on IMA_ARCH_POLICY
977 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
979 Systems with firmware secure boot enabled need to define security
980 policies to extend secure boot to the OS. This config allows a user
981 to enable OS secure boot on systems that have firmware support for
982 it. If in doubt say N.
984 config PPC_SECVAR_SYSFS
985 bool "Enable sysfs interface for POWER secure variables"
987 depends on PPC_SECURE_BOOT
990 POWER secure variables are managed and controlled by firmware.
991 These variables are exposed to userspace via sysfs to enable
992 read/write operations on these variables. Say Y if you have
993 secure boot enabled and want to expose variables to userspace.
995 config PPC_RTAS_FILTER
996 bool "Enable filtering of RTAS syscalls"
1000 The RTAS syscall API has security issues that could be used to
1001 compromise system integrity. This option enforces restrictions on the
1002 RTAS calls and arguments passed by userspace programs to mitigate
1005 Say Y unless you know what you are doing and the filter is causing
1017 bool "Support for ISA-bus hardware"
1021 Find out whether you have ISA slots on your motherboard. ISA is the
1022 name of a bus system, i.e. the way the CPU talks to the other stuff
1023 inside your box. If you have an Apple machine, say N here; if you
1024 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1025 embedded board, consult your board documentation.
1027 config GENERIC_ISA_DMA
1029 depends on ISA_DMA_API
1032 config PPC_INDIRECT_PCI
1035 default y if 40x || 44x
1045 select ARCH_HAS_DMA_SET_MASK
1046 select PPC_INDIRECT_PCI
1052 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1054 Freescale MPC85xx/MPC86xx power management controller support
1055 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1060 depends on SUSPEND && (44x || 40x)
1062 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1063 It also enables support for two different idle states (idle-wait
1070 bool "Freescale Local Bus support"
1072 Enables reporting of errors from the Freescale local bus
1073 controller. Also contains some common code used by
1074 drivers for specific local bus peripherals.
1078 depends on PPC_83xx || QUICC_ENGINE || CPM2
1080 Freescale General-purpose Timers support
1084 depends on PCI && 8260
1085 select PPC_INDIRECT_PCI
1089 bool "Freescale Embedded SRIO Controller support"
1090 depends on RAPIDIO = y && HAVE_RAPIDIO
1093 Include support for RapidIO controller on Freescale embedded
1094 processors (MPC8548, MPC8641, etc).
1098 config NONSTATIC_KERNEL
1101 menu "Advanced setup"
1104 config ADVANCED_OPTIONS
1105 bool "Prompt for advanced kernel configuration options"
1107 This option will enable prompting for a variety of advanced kernel
1108 configuration options. These options can cause the kernel to not
1109 work if they are set incorrectly, but can be used to optimize certain
1110 aspects of kernel memory management.
1112 Unless you know what you are doing, say N here.
1114 comment "Default settings for advanced configuration options are used"
1115 depends on !ADVANCED_OPTIONS
1117 config LOWMEM_SIZE_BOOL
1118 bool "Set maximum low memory"
1119 depends on ADVANCED_OPTIONS
1121 This option allows you to set the maximum amount of memory which
1122 will be used as "low memory", that is, memory which the kernel can
1123 access directly, without having to set up a kernel virtual mapping.
1124 This can be useful in optimizing the layout of kernel virtual
1127 Say N here unless you know what you are doing.
1130 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1131 default "0x30000000"
1133 config LOWMEM_CAM_NUM_BOOL
1134 bool "Set number of CAMs to use to map low memory"
1135 depends on ADVANCED_OPTIONS && FSL_BOOKE
1137 This option allows you to set the maximum number of CAM slots that
1138 will be used to map low memory. There are a limited number of slots
1139 available and even more limited number that will fit in the L1 MMU.
1140 However, using more entries will allow mapping more low memory. This
1141 can be useful in optimizing the layout of kernel virtual memory.
1143 Say N here unless you know what you are doing.
1145 config LOWMEM_CAM_NUM
1146 depends on FSL_BOOKE
1147 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1148 default 3 if !STRICT_KERNEL_RWX
1149 default 9 if DATA_SHIFT >= 24
1150 default 12 if DATA_SHIFT >= 22
1153 config DYNAMIC_MEMSTART
1154 bool "Enable page aligned dynamic load address for kernel"
1155 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1156 select NONSTATIC_KERNEL
1158 This option enables the kernel to be loaded at any page aligned
1159 physical address. The kernel creates a mapping from KERNELBASE to
1160 the address where the kernel is loaded. The page size here implies
1161 the TLB page size of the mapping for kernel on the particular platform.
1162 Please refer to the init code for finding the TLB page size.
1164 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1165 kernel image, where the only restriction is the page aligned kernel
1166 load address. When this option is enabled, the compile time physical
1167 address CONFIG_PHYSICAL_START is ignored.
1169 This option is overridden by CONFIG_RELOCATABLE
1171 config PAGE_OFFSET_BOOL
1172 bool "Set custom page offset address"
1173 depends on ADVANCED_OPTIONS
1175 This option allows you to set the kernel virtual address at which
1176 the kernel will map low memory. This can be useful in optimizing
1177 the virtual memory layout of the system.
1179 Say N here unless you know what you are doing.
1182 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1183 default "0xc0000000"
1185 config KERNEL_START_BOOL
1186 bool "Set custom kernel base address"
1187 depends on ADVANCED_OPTIONS
1189 This option allows you to set the kernel virtual address at which
1190 the kernel will be loaded. Normally this should match PAGE_OFFSET
1191 however there are times (like kdump) that one might not want them
1194 Say N here unless you know what you are doing.
1197 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1198 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1199 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1200 default "0xc0000000"
1202 config PHYSICAL_START_BOOL
1203 bool "Set physical address where the kernel is loaded"
1204 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1206 This gives the physical address where the kernel is loaded.
1208 Say N here unless you know what you are doing.
1210 config PHYSICAL_START
1211 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1212 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1213 default "0x00000000"
1215 config PHYSICAL_ALIGN
1217 default "0x04000000" if FSL_BOOKE
1219 This value puts the alignment restrictions on physical address
1220 where kernel is loaded and run from. Kernel is compiled for an
1221 address which meets above alignment restriction.
1223 config TASK_SIZE_BOOL
1224 bool "Set custom user task size"
1225 depends on ADVANCED_OPTIONS
1227 This option allows you to set the amount of virtual address space
1228 allocated to user tasks. This can be useful in optimizing the
1229 virtual memory layout of the system.
1231 Say N here unless you know what you are doing.
1234 hex "Size of user task space" if TASK_SIZE_BOOL
1235 default "0x80000000" if PPC_8xx
1236 default "0xb0000000" if PPC_BOOK3S_32
1237 default "0xc0000000"
1241 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1244 default "0xc000000000000000"
1247 default "0xc000000000000000"
1248 config PHYSICAL_START
1250 default "0x00000000"
1256 config PPC_LIB_RHEAP
1259 source "arch/powerpc/kvm/Kconfig"
1261 source "kernel/livepatch/Kconfig"