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_TIME_ACCOUNTING
227 select HAVE_KERNEL_GZIP
228 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
229 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
230 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
232 select HAVE_KPROBES_ON_FTRACE
233 select HAVE_KRETPROBES
234 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
235 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
236 select HAVE_MOD_ARCH_SPECIFIC
237 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
238 select HAVE_OPTPROBES
239 select HAVE_PERF_EVENTS
240 select HAVE_PERF_EVENTS_NMI if PPC64
241 select HAVE_PERF_REGS
242 select HAVE_PERF_USER_STACK_DUMP
243 select HAVE_REGS_AND_STACK_ACCESS_API
244 select HAVE_RELIABLE_STACKTRACE
246 select HAVE_SETUP_PER_CPU_AREA if PPC64
247 select HAVE_SOFTIRQ_ON_OWN_STACK
248 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
249 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
250 select HAVE_STATIC_CALL if PPC32
251 select HAVE_SYSCALL_TRACEPOINTS
252 select HAVE_VIRT_CPU_ACCOUNTING
253 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
254 select IOMMU_HELPER if PPC64
256 select IRQ_FORCED_THREADING
257 select MMU_GATHER_PAGE_SIZE
258 select MMU_GATHER_RCU_TABLE_FREE
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
279 select VIRT_TO_BUS if !PPC64
281 # Please keep this list sorted alphabetically.
284 config PPC_BARRIER_NOSPEC
287 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
298 bool "Enable support for 32bit binaries"
300 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
301 default y if !CPU_LITTLE_ENDIAN
302 select ARCH_WANT_OLD_COMPAT_IPC
303 select COMPAT_OLD_SIGACTION
305 config SCHED_OMIT_FRAME_POINTER
309 config ARCH_MAY_HAVE_PC_FDC
313 config PPC_UDBG_16550
316 config GENERIC_TBSYNC
318 default y if PPC32 && SMP
329 config GENERIC_BUG_RELATIVE_POINTERS
331 depends on GENERIC_BUG
333 config SYS_SUPPORTS_APM_EMULATION
334 default y if PMAC_APM_EMU
340 Used to allow a board to specify it wants an ePAPR compliant wrapper.
342 config DEFAULT_UIMAGE
345 Used to allow a board to specify it wants a uImage built by default
347 config ARCH_HIBERNATION_POSSIBLE
351 config ARCH_SUSPEND_POSSIBLE
353 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
354 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
357 config ARCH_SUSPEND_NONZERO_CPU
359 depends on PPC_POWERNV || PPC_PSERIES
361 config ARCH_HAS_ADD_PAGES
363 depends on ARCH_ENABLE_MEMORY_HOTPLUG
365 config PPC_DCR_NATIVE
373 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
376 config PPC_OF_PLATFORM_PCI
379 depends on PPC64 # not supported on 32 bits yet
381 config ARCH_SUPPORTS_UPROBES
384 config PPC_ADV_DEBUG_REGS
386 depends on 40x || BOOKE
389 config PPC_ADV_DEBUG_IACS
391 depends on PPC_ADV_DEBUG_REGS
395 config PPC_ADV_DEBUG_DACS
397 depends on PPC_ADV_DEBUG_REGS
400 config PPC_ADV_DEBUG_DVCS
402 depends on PPC_ADV_DEBUG_REGS
406 config PPC_ADV_DEBUG_DAC_RANGE
408 depends on PPC_ADV_DEBUG_REGS && 44x
414 config PGTABLE_LEVELS
419 source "arch/powerpc/sysdev/Kconfig"
420 source "arch/powerpc/platforms/Kconfig"
422 menu "Kernel options"
425 bool "High memory support"
429 source "kernel/Kconfig.hz"
431 config MATH_EMULATION
432 bool "Math emulation"
433 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
436 Some PowerPC chips designed for embedded applications do not have
437 a floating-point unit and therefore do not implement the
438 floating-point instructions in the PowerPC instruction set. If you
439 say Y here, the kernel will include code to emulate a floating-point
440 unit, which will allow programs that use floating-point
443 This is also useful to emulate missing (optional) instructions
444 such as fsqrt on cores that do have an FPU but do not implement
445 them (such as Freescale BookE).
448 prompt "Math emulation options"
449 default MATH_EMULATION_FULL
450 depends on MATH_EMULATION
452 config MATH_EMULATION_FULL
453 bool "Emulate all the floating point instructions"
455 Select this option will enable the kernel to support to emulate
456 all the floating point instructions. If your SoC doesn't have
457 a FPU, you should select this.
459 config MATH_EMULATION_HW_UNIMPLEMENTED
460 bool "Just emulate the FPU unimplemented instructions"
462 Select this if you know there does have a hardware FPU on your
463 SoC, but some floating point instructions are not implemented by that.
467 config PPC_TRANSACTIONAL_MEM
468 bool "Transactional Memory support for POWERPC"
469 depends on PPC_BOOK3S_64
474 Support user-mode Transactional Memory on POWERPC.
477 bool "Ultravisor support"
478 depends on KVM_BOOK3S_HV_POSSIBLE
479 depends on DEVICE_PRIVATE
482 This option paravirtualizes the kernel to run in POWER platforms that
483 supports the Protected Execution Facility (PEF). On such platforms,
484 the ultravisor firmware runs at a privilege level above the
489 config LD_HEAD_STUB_CATCH
490 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
493 Very large kernels can cause linker branch stubs to be generated by
494 code in head_64.S, which moves the head text sections out of their
495 specified location. This option can work around the problem.
499 config MPROFILE_KERNEL
500 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
501 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
504 bool "Support for enabling/disabling CPUs"
505 depends on SMP && (PPC_PSERIES || \
506 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
508 Say Y here to be able to disable and re-enable individual
509 CPUs at runtime on SMP machines.
511 Say N if you are unsure.
513 config PPC_QUEUED_SPINLOCKS
514 bool "Queued spinlocks" if EXPERT
516 default PPC_BOOK3S_64
518 Say Y here to use queued spinlocks which give better scalability and
519 fairness on large SMP and NUMA systems without harming single threaded
522 config ARCH_CPU_PROBE_RELEASE
524 depends on HOTPLUG_CPU
526 config PPC64_SUPPORTS_MEMORY_FAILURE
527 bool "Add support for memory hwpoison"
528 depends on PPC_BOOK3S_64
529 default "y" if PPC_POWERNV
530 select ARCH_SUPPORTS_MEMORY_FAILURE
533 bool "kexec system call"
534 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
537 kexec is a system call that implements the ability to shutdown your
538 current kernel, and to start another kernel. It is like a reboot
539 but it is independent of the system firmware. And like a reboot
540 you can start any kernel with it, not just Linux.
542 The name comes from the similarity to the exec system call.
544 It is an ongoing process to be certain the hardware in a machine
545 is properly shutdown, so do not be surprised if this code does not
546 initially work for you. As of this writing the exact hardware
547 interface is strongly in flux, so no good recommendation can be
551 bool "kexec file based system call"
553 select HAVE_IMA_KEXEC if IMA
558 depends on CRYPTO_SHA256=y
560 This is a new version of the kexec system call. This call is
561 file based and takes in file descriptors as system call arguments
562 for kernel and initramfs as opposed to a list of segments as is the
563 case for the older kexec call.
565 config ARCH_HAS_KEXEC_PURGATORY
569 bool "Build a relocatable kernel"
570 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
571 select NONSTATIC_KERNEL
573 This builds a kernel image that is capable of running at the
574 location the kernel is loaded at. For ppc32, there is no any
575 alignment restrictions, and this feature is a superset of
576 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
577 16k-aligned base address. The kernel is linked as a
578 position-independent executable (PIE) and contains dynamic relocations
579 which are processed early in the bootup process.
581 One use is for the kexec on panic case where the recovery kernel
582 must live at a different physical address than the primary
585 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
586 it has been loaded at and the compile time physical addresses
587 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
588 setting can still be useful to bootwrappers that need to know the
589 load address of the kernel (eg. u-boot/mkimage).
591 config RANDOMIZE_BASE
592 bool "Randomize the address of the kernel image"
593 depends on (FSL_BOOKE && FLATMEM && PPC32)
594 depends on RELOCATABLE
596 Randomizes the virtual address at which the kernel image is
597 loaded, as a security feature that deters exploit attempts
598 relying on knowledge of the location of kernel internals.
602 config RELOCATABLE_TEST
603 bool "Test relocatable kernel"
604 depends on (PPC64 && RELOCATABLE)
606 This runs the relocatable kernel at the address it was initially
607 loaded at, which tends to be non-zero and therefore test the
611 bool "Build a dump capture kernel"
612 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
613 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
615 Build a kernel suitable for use as a dump capture kernel.
616 The same kernel binary can be used as production kernel and dump
620 bool "Firmware-assisted dump"
621 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
625 A robust mechanism to get reliable kernel crash dump with
626 assistance from firmware. This approach does not use kexec,
627 instead firmware assists in booting the capture kernel
628 while preserving memory contents. Firmware-assisted dump
629 is meant to be a kdump replacement offering robustness and
630 speed not possible without system firmware assistance.
632 If unsure, say "y". Only special kernels like petitboot may
633 need to say "N" here.
635 config PRESERVE_FA_DUMP
636 bool "Preserve Firmware-assisted dump"
637 depends on PPC64 && PPC_POWERNV && !FA_DUMP
639 On a kernel with FA_DUMP disabled, this option helps to preserve
640 crash data from a previously crash'ed kernel. Useful when the next
641 memory preserving kernel boot would process this crash data.
642 Petitboot kernel is the typical usecase for this option.
645 bool "Export OPAL memory as /sys/firmware/opal/core"
646 depends on PPC64 && PPC_POWERNV
648 This option uses the MPIPL support in firmware to provide an
649 ELF core of OPAL memory after a crash. The ELF core is exported
650 as /sys/firmware/opal/core file which is helpful in debugging
651 OPAL crashes using GDB.
654 bool "Distribute interrupts on all CPUs by default"
657 This option gives the kernel permission to distribute IRQs across
658 multiple CPUs. Saying N here will route all IRQs to the first
659 CPU. Generally saying Y is safe, although some problems have been
660 reported with SMP Power Macintoshes with this option enabled.
663 bool "NUMA Memory Allocation and Scheduler Support"
664 depends on PPC64 && SMP
665 default y if PPC_PSERIES || PPC_POWERNV
666 select USE_PERCPU_NUMA_NODE_ID
668 Enable NUMA (Non-Uniform Memory Access) support.
670 The kernel will try to allocate memory used by a CPU on the
671 local memory controller of the CPU and add some more
672 NUMA awareness to the kernel.
680 config HAVE_MEMORYLESS_NODES
684 config ARCH_SELECT_MEMORY_MODEL
688 config ARCH_FLATMEM_ENABLE
690 depends on (PPC64 && !NUMA) || PPC32
692 config ARCH_SPARSEMEM_ENABLE
695 select SPARSEMEM_VMEMMAP_ENABLE
697 config ARCH_SPARSEMEM_DEFAULT
699 depends on PPC_BOOK3S_64
701 config ILLEGAL_POINTER_VALUE
703 # This is roughly half way between the top of user space and the bottom
704 # of kernel space, which seems about as good as we can get.
705 default 0x5deadbeef0000000 if PPC64
708 config ARCH_MEMORY_PROBE
710 depends on MEMORY_HOTPLUG
714 default PPC_64K_PAGES if PPC_BOOK3S_64
717 Select the kernel logical page size. Increasing the page size
718 will reduce software overhead at each page boundary, allow
719 hardware prefetch mechanisms to be more effective, and allow
720 larger dma transfers increasing IO efficiency and reducing
721 overhead. However the utilization of memory will increase.
722 For example, each cached file will using a multiple of the
723 page size to hold its contents and the difference between the
724 end of file and the end of page is wasted.
726 Some dedicated systems, such as software raid serving with
727 accelerated calculations, have shown significant increases.
729 If you configure a 64 bit kernel for 64k pages but the
730 processor does not support them, then the kernel will simulate
731 them with 4k pages, loading them on demand, but with the
732 reduced software overhead and larger internal fragmentation.
733 For the 32 bit kernel, a large page option will not be offered
734 unless it is supported by the configured processor.
736 If unsure, choose 4K_PAGES.
740 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
744 depends on 44x || PPC_8xx
748 depends on 44x || PPC_BOOK3S_64
749 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
751 config PPC_256K_PAGES
752 bool "256k page size (Requires non-standard binutils settings)"
753 depends on 44x && !PPC_47x
755 Make the page size 256k.
757 The kernel will only be able to run applications that have been
758 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
759 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
760 definition from 0x10000 to 0x40000 in older versions.
766 depends on PPC_4K_PAGES
768 config PAGE_SIZE_16KB
770 depends on PPC_16K_PAGES
772 config PAGE_SIZE_64KB
774 depends on PPC_64K_PAGES
776 config PAGE_SIZE_256KB
778 depends on PPC_256K_PAGES
780 config PPC_PAGE_SHIFT
782 default 18 if PPC_256K_PAGES
783 default 16 if PPC_64K_PAGES
784 default 14 if PPC_16K_PAGES
788 int "Thread shift" if EXPERT
790 default "15" if PPC_256K_PAGES
791 default "14" if PPC64
794 Used to define the stack size. The default is almost always what you
795 want. Only change this if you know what you are doing.
797 config DATA_SHIFT_BOOL
798 bool "Set custom data alignment"
799 depends on ADVANCED_OPTIONS
800 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
801 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
804 This option allows you to set the kernel data alignment. When
805 RAM is mapped by blocks, the alignment needs to fit the size and
806 number of possible blocks. The default should be OK for most configs.
808 Say N here unless you know what you are doing.
811 int "Data shift" if DATA_SHIFT_BOOL
812 default 24 if STRICT_KERNEL_RWX && PPC64
813 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
814 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
815 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
816 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
817 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
818 default 23 if STRICT_KERNEL_RWX && PPC_8xx
819 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
820 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
821 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
822 default PPC_PAGE_SHIFT
824 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
825 Smaller is the alignment, greater is the number of necessary DBATs.
827 On 8xx, large pages (512kb or 8M) are used to map kernel linear
828 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
829 in that case. If PIN_TLB is selected, it must be aligned to 8M as
830 8M pages will be pinned.
832 config FORCE_MAX_ZONEORDER
833 int "Maximum zone order"
834 range 8 9 if PPC64 && PPC_64K_PAGES
835 default "9" if PPC64 && PPC_64K_PAGES
836 range 13 13 if PPC64 && !PPC_64K_PAGES
837 default "13" if PPC64 && !PPC_64K_PAGES
838 range 9 64 if PPC32 && PPC_16K_PAGES
839 default "9" if PPC32 && PPC_16K_PAGES
840 range 7 64 if PPC32 && PPC_64K_PAGES
841 default "7" if PPC32 && PPC_64K_PAGES
842 range 5 64 if PPC32 && PPC_256K_PAGES
843 default "5" if PPC32 && PPC_256K_PAGES
847 The kernel memory allocator divides physically contiguous memory
848 blocks into "zones", where each zone is a power of two number of
849 pages. This option selects the largest power of two that the kernel
850 keeps in the memory allocator. If you need to allocate very large
851 blocks of physically contiguous memory, then you may need to
854 This config option is actually maximum order plus one. For example,
855 a value of 11 means that the largest free memory block is 2^10 pages.
857 The page size is not necessarily 4KB. For example, on 64-bit
858 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
859 this in mind when choosing a value for this option.
861 config PPC_SUBPAGE_PROT
862 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
864 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
866 This option adds support for system call to allow user programs
867 to set access permissions (read/write, readonly, or no access)
868 on the 4k subpages of each 64k page.
870 If unsure, say N here.
872 config PPC_PROT_SAO_LPAR
873 bool "Support PROT_SAO mappings in LPARs"
874 depends on PPC_BOOK3S_64
876 This option adds support for PROT_SAO mappings from userspace
877 inside LPARs on supported CPUs.
879 This may cause issues when performing guest migration from
880 a CPU that supports SAO to one that does not.
882 If unsure, say N here.
884 config PPC_COPRO_BASE
888 bool "SMT (Hyperthreading) scheduler support"
889 depends on PPC64 && SMP
891 SMT scheduler support improves the CPU scheduler's decision making
892 when dealing with POWER5 cpus at a cost of slightly increased
893 overhead in some places. If unsure say N here.
895 config PPC_DENORMALISATION
896 bool "PowerPC denormalisation exception handling"
897 depends on PPC_BOOK3S_64
898 default "y" if PPC_POWERNV
900 Add support for handling denormalisation of single precision
901 values. Useful for bare metal only. If unsure say Y here.
904 string "Initial kernel command string"
907 On some platforms, there is currently no way for the boot loader to
908 pass arguments to the kernel. For these platforms, you can supply
909 some command-line options at build time by entering them here. In
910 most cases you will need to specify the root device here.
913 prompt "Kernel command line type" if CMDLINE != ""
914 default CMDLINE_FROM_BOOTLOADER
916 config CMDLINE_FROM_BOOTLOADER
917 bool "Use bootloader kernel arguments if available"
919 Uses the command-line options passed by the boot loader. If
920 the boot loader doesn't provide any, the default kernel command
921 string provided in CMDLINE will be used.
923 config CMDLINE_EXTEND
924 bool "Extend bootloader kernel arguments"
926 The command-line arguments provided by the boot loader will be
927 appended to the default kernel command string.
930 bool "Always use the default kernel command string"
932 Always use the default kernel command string, even if the boot
933 loader passes other arguments to the kernel.
934 This is useful if you cannot or don't want to change the
935 command-line options your boot loader passes to the kernel.
940 string "Additional default image types"
942 List additional targets to be built by the bootwrapper here (separated
943 by spaces). This is useful for targets that depend of device tree
944 files in the .dts directory.
946 Targets in this list will be build as part of the default build
947 target, or when the user does a 'make zImage' or a
948 'make zImage.initrd'.
950 If unsure, leave blank
952 config ARCH_WANTS_FREEZER_CONTROL
956 source "kernel/power/Kconfig"
959 prompt "PowerPC Memory Protection Keys"
961 depends on PPC_BOOK3S_64
962 depends on PPC_64S_HASH_MMU
963 select ARCH_USES_HIGH_VMA_FLAGS
964 select ARCH_HAS_PKEYS
966 Memory Protection Keys provides a mechanism for enforcing
967 page-based protections, but without requiring modification of the
968 page tables when an application changes protection domains.
970 For details, see Documentation/core-api/protection-keys.rst
974 config PPC_SECURE_BOOT
975 prompt "Enable secure boot support"
977 depends on PPC_POWERNV || PPC_PSERIES
978 depends on IMA_ARCH_POLICY
979 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
981 Systems with firmware secure boot enabled need to define security
982 policies to extend secure boot to the OS. This config allows a user
983 to enable OS secure boot on systems that have firmware support for
984 it. If in doubt say N.
986 config PPC_SECVAR_SYSFS
987 bool "Enable sysfs interface for POWER secure variables"
989 depends on PPC_SECURE_BOOT
992 POWER secure variables are managed and controlled by firmware.
993 These variables are exposed to userspace via sysfs to enable
994 read/write operations on these variables. Say Y if you have
995 secure boot enabled and want to expose variables to userspace.
997 config PPC_RTAS_FILTER
998 bool "Enable filtering of RTAS syscalls"
1002 The RTAS syscall API has security issues that could be used to
1003 compromise system integrity. This option enforces restrictions on the
1004 RTAS calls and arguments passed by userspace programs to mitigate
1007 Say Y unless you know what you are doing and the filter is causing
1019 bool "Support for ISA-bus hardware"
1023 Find out whether you have ISA slots on your motherboard. ISA is the
1024 name of a bus system, i.e. the way the CPU talks to the other stuff
1025 inside your box. If you have an Apple machine, say N here; if you
1026 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1027 embedded board, consult your board documentation.
1029 config GENERIC_ISA_DMA
1031 depends on ISA_DMA_API
1034 config PPC_INDIRECT_PCI
1037 default y if 40x || 44x
1047 select ARCH_HAS_DMA_SET_MASK
1048 select PPC_INDIRECT_PCI
1054 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1056 Freescale MPC85xx/MPC86xx power management controller support
1057 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1062 depends on SUSPEND && (44x || 40x)
1064 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1065 It also enables support for two different idle states (idle-wait
1072 bool "Freescale Local Bus support"
1074 Enables reporting of errors from the Freescale local bus
1075 controller. Also contains some common code used by
1076 drivers for specific local bus peripherals.
1080 depends on PPC_83xx || QUICC_ENGINE || CPM2
1082 Freescale General-purpose Timers support
1086 depends on PCI && 8260
1087 select PPC_INDIRECT_PCI
1091 bool "Freescale Embedded SRIO Controller support"
1092 depends on RAPIDIO = y && HAVE_RAPIDIO
1095 Include support for RapidIO controller on Freescale embedded
1096 processors (MPC8548, MPC8641, etc).
1100 config NONSTATIC_KERNEL
1103 menu "Advanced setup"
1106 config ADVANCED_OPTIONS
1107 bool "Prompt for advanced kernel configuration options"
1109 This option will enable prompting for a variety of advanced kernel
1110 configuration options. These options can cause the kernel to not
1111 work if they are set incorrectly, but can be used to optimize certain
1112 aspects of kernel memory management.
1114 Unless you know what you are doing, say N here.
1116 comment "Default settings for advanced configuration options are used"
1117 depends on !ADVANCED_OPTIONS
1119 config LOWMEM_SIZE_BOOL
1120 bool "Set maximum low memory"
1121 depends on ADVANCED_OPTIONS
1123 This option allows you to set the maximum amount of memory which
1124 will be used as "low memory", that is, memory which the kernel can
1125 access directly, without having to set up a kernel virtual mapping.
1126 This can be useful in optimizing the layout of kernel virtual
1129 Say N here unless you know what you are doing.
1132 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1133 default "0x30000000"
1135 config LOWMEM_CAM_NUM_BOOL
1136 bool "Set number of CAMs to use to map low memory"
1137 depends on ADVANCED_OPTIONS && FSL_BOOKE
1139 This option allows you to set the maximum number of CAM slots that
1140 will be used to map low memory. There are a limited number of slots
1141 available and even more limited number that will fit in the L1 MMU.
1142 However, using more entries will allow mapping more low memory. This
1143 can be useful in optimizing the layout of kernel virtual memory.
1145 Say N here unless you know what you are doing.
1147 config LOWMEM_CAM_NUM
1148 depends on FSL_BOOKE
1149 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1150 default 3 if !STRICT_KERNEL_RWX
1151 default 9 if DATA_SHIFT >= 24
1152 default 12 if DATA_SHIFT >= 22
1155 config DYNAMIC_MEMSTART
1156 bool "Enable page aligned dynamic load address for kernel"
1157 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1158 select NONSTATIC_KERNEL
1160 This option enables the kernel to be loaded at any page aligned
1161 physical address. The kernel creates a mapping from KERNELBASE to
1162 the address where the kernel is loaded. The page size here implies
1163 the TLB page size of the mapping for kernel on the particular platform.
1164 Please refer to the init code for finding the TLB page size.
1166 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1167 kernel image, where the only restriction is the page aligned kernel
1168 load address. When this option is enabled, the compile time physical
1169 address CONFIG_PHYSICAL_START is ignored.
1171 This option is overridden by CONFIG_RELOCATABLE
1173 config PAGE_OFFSET_BOOL
1174 bool "Set custom page offset address"
1175 depends on ADVANCED_OPTIONS
1177 This option allows you to set the kernel virtual address at which
1178 the kernel will map low memory. This can be useful in optimizing
1179 the virtual memory layout of the system.
1181 Say N here unless you know what you are doing.
1184 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1185 default "0xc0000000"
1187 config KERNEL_START_BOOL
1188 bool "Set custom kernel base address"
1189 depends on ADVANCED_OPTIONS
1191 This option allows you to set the kernel virtual address at which
1192 the kernel will be loaded. Normally this should match PAGE_OFFSET
1193 however there are times (like kdump) that one might not want them
1196 Say N here unless you know what you are doing.
1199 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1200 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1201 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1202 default "0xc0000000"
1204 config PHYSICAL_START_BOOL
1205 bool "Set physical address where the kernel is loaded"
1206 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1208 This gives the physical address where the kernel is loaded.
1210 Say N here unless you know what you are doing.
1212 config PHYSICAL_START
1213 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1214 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1215 default "0x00000000"
1217 config PHYSICAL_ALIGN
1219 default "0x04000000" if FSL_BOOKE
1221 This value puts the alignment restrictions on physical address
1222 where kernel is loaded and run from. Kernel is compiled for an
1223 address which meets above alignment restriction.
1225 config TASK_SIZE_BOOL
1226 bool "Set custom user task size"
1227 depends on ADVANCED_OPTIONS
1229 This option allows you to set the amount of virtual address space
1230 allocated to user tasks. This can be useful in optimizing the
1231 virtual memory layout of the system.
1233 Say N here unless you know what you are doing.
1236 hex "Size of user task space" if TASK_SIZE_BOOL
1237 default "0x80000000" if PPC_8xx
1238 default "0xb0000000" if PPC_BOOK3S_32
1239 default "0xc0000000"
1243 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1246 default "0xc000000000000000"
1249 default "0xc000000000000000"
1250 config PHYSICAL_START
1252 default "0x00000000"
1258 config PPC_LIB_RHEAP
1261 source "arch/powerpc/kvm/Kconfig"
1263 source "kernel/livepatch/Kconfig"