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 if PPC_BOOK3E_64
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_RANDOMIZE_KSTACK_OFFSET
199 select HAVE_ARCH_KGDB
200 select HAVE_ARCH_MMAP_RND_BITS
201 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
202 select HAVE_ARCH_NVRAM_OPS
203 select HAVE_ARCH_SECCOMP_FILTER
204 select HAVE_ARCH_TRACEHOOK
205 select HAVE_ASM_MODVERSIONS
206 select HAVE_CONTEXT_TRACKING_USER if PPC64
207 select HAVE_C_RECORDMCOUNT
208 select HAVE_DEBUG_KMEMLEAK
209 select HAVE_DEBUG_STACKOVERFLOW
210 select HAVE_DYNAMIC_FTRACE
211 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
212 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
214 select HAVE_EFFICIENT_UNALIGNED_ACCESS
216 select HAVE_FTRACE_MCOUNT_RECORD
217 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
218 select HAVE_FUNCTION_ERROR_INJECTION
219 select HAVE_FUNCTION_GRAPH_TRACER
220 select HAVE_FUNCTION_TRACER
221 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
222 select HAVE_GENERIC_VDSO
223 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
224 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
225 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
226 select HAVE_IOREMAP_PROT
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 KASAN_VMALLOC if KASAN && MODULES
259 select MMU_GATHER_PAGE_SIZE
260 select MMU_GATHER_RCU_TABLE_FREE
261 select MMU_GATHER_MERGE_VMAS
262 select MODULES_USE_ELF_RELA
263 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
264 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
265 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
266 select NEED_SG_DMA_LENGTH
268 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
269 select OF_EARLY_FLATTREE
270 select OLD_SIGACTION if PPC32
271 select OLD_SIGSUSPEND
272 select PCI_DOMAINS if PCI
273 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
274 select PCI_SYSCALL if PCI
275 select PPC_DAWR if PPC64
278 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
279 select SYSCTL_EXCEPTION_TRACE
280 select THREAD_INFO_IN_TASK
281 select TRACE_IRQFLAGS_SUPPORT
283 # Please keep this list sorted alphabetically.
286 config PPC_LONG_DOUBLE_128
288 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
290 config PPC_BARRIER_NOSPEC
293 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
304 bool "Enable support for 32bit binaries"
306 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
307 default y if !CPU_LITTLE_ENDIAN
308 select ARCH_WANT_OLD_COMPAT_IPC
309 select COMPAT_OLD_SIGACTION
311 config SCHED_OMIT_FRAME_POINTER
315 config ARCH_MAY_HAVE_PC_FDC
319 config PPC_UDBG_16550
322 config GENERIC_TBSYNC
324 default y if PPC32 && SMP
335 config GENERIC_BUG_RELATIVE_POINTERS
337 depends on GENERIC_BUG
339 config SYS_SUPPORTS_APM_EMULATION
340 default y if PMAC_APM_EMU
346 Used to allow a board to specify it wants an ePAPR compliant wrapper.
348 config DEFAULT_UIMAGE
351 Used to allow a board to specify it wants a uImage built by default
353 config ARCH_HIBERNATION_POSSIBLE
357 config ARCH_SUSPEND_POSSIBLE
359 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
360 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
363 config ARCH_SUSPEND_NONZERO_CPU
365 depends on PPC_POWERNV || PPC_PSERIES
367 config ARCH_HAS_ADD_PAGES
369 depends on ARCH_ENABLE_MEMORY_HOTPLUG
371 config PPC_DCR_NATIVE
379 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
382 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
384 depends on !PPC_PMAC && !PPC_CHRP
385 bool "Assign PCI bus numbers from zero individually for each PCI domain"
387 By default on PPC32 were PCI bus numbers unique across all PCI domains.
388 So system could have only 256 PCI buses independently of available
389 PCI domains. When this option is enabled then PCI bus numbers are
390 PCI domain dependent and each PCI controller on own domain can have
391 256 PCI buses, like it is on other Linux architectures.
393 config PPC_OF_PLATFORM_PCI
396 depends on PPC64 # not supported on 32 bits yet
398 config ARCH_SUPPORTS_UPROBES
401 config PPC_ADV_DEBUG_REGS
403 depends on 40x || BOOKE
406 config PPC_ADV_DEBUG_IACS
408 depends on PPC_ADV_DEBUG_REGS
412 config PPC_ADV_DEBUG_DACS
414 depends on PPC_ADV_DEBUG_REGS
417 config PPC_ADV_DEBUG_DVCS
419 depends on PPC_ADV_DEBUG_REGS
423 config PPC_ADV_DEBUG_DAC_RANGE
425 depends on PPC_ADV_DEBUG_REGS && 44x
431 config PGTABLE_LEVELS
436 source "arch/powerpc/sysdev/Kconfig"
437 source "arch/powerpc/platforms/Kconfig"
439 menu "Kernel options"
442 bool "High memory support"
446 source "kernel/Kconfig.hz"
448 config MATH_EMULATION
449 bool "Math emulation"
450 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
453 Some PowerPC chips designed for embedded applications do not have
454 a floating-point unit and therefore do not implement the
455 floating-point instructions in the PowerPC instruction set. If you
456 say Y here, the kernel will include code to emulate a floating-point
457 unit, which will allow programs that use floating-point
460 This is also useful to emulate missing (optional) instructions
461 such as fsqrt on cores that do have an FPU but do not implement
462 them (such as Freescale BookE).
465 prompt "Math emulation options"
466 default MATH_EMULATION_FULL
467 depends on MATH_EMULATION
469 config MATH_EMULATION_FULL
470 bool "Emulate all the floating point instructions"
472 Select this option will enable the kernel to support to emulate
473 all the floating point instructions. If your SoC doesn't have
474 a FPU, you should select this.
476 config MATH_EMULATION_HW_UNIMPLEMENTED
477 bool "Just emulate the FPU unimplemented instructions"
479 Select this if you know there does have a hardware FPU on your
480 SoC, but some floating point instructions are not implemented by that.
484 config PPC_TRANSACTIONAL_MEM
485 bool "Transactional Memory support for POWERPC"
486 depends on PPC_BOOK3S_64
491 Support user-mode Transactional Memory on POWERPC.
494 bool "Ultravisor support"
495 depends on KVM_BOOK3S_HV_POSSIBLE
496 depends on DEVICE_PRIVATE
499 This option paravirtualizes the kernel to run in POWER platforms that
500 supports the Protected Execution Facility (PEF). On such platforms,
501 the ultravisor firmware runs at a privilege level above the
506 config LD_HEAD_STUB_CATCH
507 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
510 Very large kernels can cause linker branch stubs to be generated by
511 code in head_64.S, which moves the head text sections out of their
512 specified location. This option can work around the problem.
516 config MPROFILE_KERNEL
517 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
518 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
521 bool "Support for enabling/disabling CPUs"
522 depends on SMP && (PPC_PSERIES || \
523 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
525 Say Y here to be able to disable and re-enable individual
526 CPUs at runtime on SMP machines.
528 Say N if you are unsure.
530 config PPC_QUEUED_SPINLOCKS
531 bool "Queued spinlocks" if EXPERT
533 default PPC_BOOK3S_64
535 Say Y here to use queued spinlocks which give better scalability and
536 fairness on large SMP and NUMA systems without harming single threaded
539 config ARCH_CPU_PROBE_RELEASE
541 depends on HOTPLUG_CPU
543 config PPC64_SUPPORTS_MEMORY_FAILURE
544 bool "Add support for memory hwpoison"
545 depends on PPC_BOOK3S_64
546 default "y" if PPC_POWERNV
547 select ARCH_SUPPORTS_MEMORY_FAILURE
550 bool "kexec system call"
551 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
554 kexec is a system call that implements the ability to shutdown your
555 current kernel, and to start another kernel. It is like a reboot
556 but it is independent of the system firmware. And like a reboot
557 you can start any kernel with it, not just Linux.
559 The name comes from the similarity to the exec system call.
561 It is an ongoing process to be certain the hardware in a machine
562 is properly shutdown, so do not be surprised if this code does not
563 initially work for you. As of this writing the exact hardware
564 interface is strongly in flux, so no good recommendation can be
568 bool "kexec file based system call"
570 select HAVE_IMA_KEXEC if IMA
574 depends on CRYPTO_SHA256=y
576 This is a new version of the kexec system call. This call is
577 file based and takes in file descriptors as system call arguments
578 for kernel and initramfs as opposed to a list of segments as is the
579 case for the older kexec call.
581 config ARCH_HAS_KEXEC_PURGATORY
585 bool "Build a relocatable kernel"
586 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
587 select NONSTATIC_KERNEL
589 This builds a kernel image that is capable of running at the
590 location the kernel is loaded at. For ppc32, there is no any
591 alignment restrictions, and this feature is a superset of
592 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
593 16k-aligned base address. The kernel is linked as a
594 position-independent executable (PIE) and contains dynamic relocations
595 which are processed early in the bootup process.
597 One use is for the kexec on panic case where the recovery kernel
598 must live at a different physical address than the primary
601 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
602 it has been loaded at and the compile time physical addresses
603 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
604 setting can still be useful to bootwrappers that need to know the
605 load address of the kernel (eg. u-boot/mkimage).
607 config RANDOMIZE_BASE
608 bool "Randomize the address of the kernel image"
609 depends on (FSL_BOOKE && FLATMEM && PPC32)
610 depends on RELOCATABLE
612 Randomizes the virtual address at which the kernel image is
613 loaded, as a security feature that deters exploit attempts
614 relying on knowledge of the location of kernel internals.
618 config RELOCATABLE_TEST
619 bool "Test relocatable kernel"
620 depends on (PPC64 && RELOCATABLE)
622 This runs the relocatable kernel at the address it was initially
623 loaded at, which tends to be non-zero and therefore test the
627 bool "Build a dump capture kernel"
628 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
629 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
631 Build a kernel suitable for use as a dump capture kernel.
632 The same kernel binary can be used as production kernel and dump
636 bool "Firmware-assisted dump"
637 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
641 A robust mechanism to get reliable kernel crash dump with
642 assistance from firmware. This approach does not use kexec,
643 instead firmware assists in booting the capture kernel
644 while preserving memory contents. Firmware-assisted dump
645 is meant to be a kdump replacement offering robustness and
646 speed not possible without system firmware assistance.
648 If unsure, say "y". Only special kernels like petitboot may
649 need to say "N" here.
651 config PRESERVE_FA_DUMP
652 bool "Preserve Firmware-assisted dump"
653 depends on PPC64 && PPC_POWERNV && !FA_DUMP
655 On a kernel with FA_DUMP disabled, this option helps to preserve
656 crash data from a previously crash'ed kernel. Useful when the next
657 memory preserving kernel boot would process this crash data.
658 Petitboot kernel is the typical usecase for this option.
661 bool "Export OPAL memory as /sys/firmware/opal/core"
662 depends on PPC64 && PPC_POWERNV
664 This option uses the MPIPL support in firmware to provide an
665 ELF core of OPAL memory after a crash. The ELF core is exported
666 as /sys/firmware/opal/core file which is helpful in debugging
667 OPAL crashes using GDB.
670 bool "Distribute interrupts on all CPUs by default"
673 This option gives the kernel permission to distribute IRQs across
674 multiple CPUs. Saying N here will route all IRQs to the first
675 CPU. Generally saying Y is safe, although some problems have been
676 reported with SMP Power Macintoshes with this option enabled.
679 bool "NUMA Memory Allocation and Scheduler Support"
680 depends on PPC64 && SMP
681 default y if PPC_PSERIES || PPC_POWERNV
682 select USE_PERCPU_NUMA_NODE_ID
684 Enable NUMA (Non-Uniform Memory Access) support.
686 The kernel will try to allocate memory used by a CPU on the
687 local memory controller of the CPU and add some more
688 NUMA awareness to the kernel.
696 config HAVE_MEMORYLESS_NODES
700 config ARCH_SELECT_MEMORY_MODEL
704 config ARCH_FLATMEM_ENABLE
706 depends on (PPC64 && !NUMA) || PPC32
708 config ARCH_SPARSEMEM_ENABLE
711 select SPARSEMEM_VMEMMAP_ENABLE
713 config ARCH_SPARSEMEM_DEFAULT
715 depends on PPC_BOOK3S_64
717 config ILLEGAL_POINTER_VALUE
719 # This is roughly half way between the top of user space and the bottom
720 # of kernel space, which seems about as good as we can get.
721 default 0x5deadbeef0000000 if PPC64
724 config ARCH_MEMORY_PROBE
726 depends on MEMORY_HOTPLUG
730 default PPC_64K_PAGES if PPC_BOOK3S_64
733 Select the kernel logical page size. Increasing the page size
734 will reduce software overhead at each page boundary, allow
735 hardware prefetch mechanisms to be more effective, and allow
736 larger dma transfers increasing IO efficiency and reducing
737 overhead. However the utilization of memory will increase.
738 For example, each cached file will using a multiple of the
739 page size to hold its contents and the difference between the
740 end of file and the end of page is wasted.
742 Some dedicated systems, such as software raid serving with
743 accelerated calculations, have shown significant increases.
745 If you configure a 64 bit kernel for 64k pages but the
746 processor does not support them, then the kernel will simulate
747 them with 4k pages, loading them on demand, but with the
748 reduced software overhead and larger internal fragmentation.
749 For the 32 bit kernel, a large page option will not be offered
750 unless it is supported by the configured processor.
752 If unsure, choose 4K_PAGES.
756 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
760 depends on 44x || PPC_8xx
764 depends on 44x || PPC_BOOK3S_64
765 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
767 config PPC_256K_PAGES
768 bool "256k page size (Requires non-standard binutils settings)"
769 depends on 44x && !PPC_47x
771 Make the page size 256k.
773 The kernel will only be able to run applications that have been
774 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
775 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
776 definition from 0x10000 to 0x40000 in older versions.
782 depends on PPC_4K_PAGES
784 config PAGE_SIZE_16KB
786 depends on PPC_16K_PAGES
788 config PAGE_SIZE_64KB
790 depends on PPC_64K_PAGES
792 config PAGE_SIZE_256KB
794 depends on PPC_256K_PAGES
796 config PPC_PAGE_SHIFT
798 default 18 if PPC_256K_PAGES
799 default 16 if PPC_64K_PAGES
800 default 14 if PPC_16K_PAGES
804 int "Thread shift" if EXPERT
806 default "15" if PPC_256K_PAGES
807 default "14" if PPC64
810 Used to define the stack size. The default is almost always what you
811 want. Only change this if you know what you are doing.
813 config DATA_SHIFT_BOOL
814 bool "Set custom data alignment"
815 depends on ADVANCED_OPTIONS
816 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
817 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
820 This option allows you to set the kernel data alignment. When
821 RAM is mapped by blocks, the alignment needs to fit the size and
822 number of possible blocks. The default should be OK for most configs.
824 Say N here unless you know what you are doing.
827 int "Data shift" if DATA_SHIFT_BOOL
828 default 24 if STRICT_KERNEL_RWX && PPC64
829 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
830 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
831 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
832 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
833 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
834 default 23 if STRICT_KERNEL_RWX && PPC_8xx
835 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
836 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
837 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
838 default PPC_PAGE_SHIFT
840 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
841 Smaller is the alignment, greater is the number of necessary DBATs.
843 On 8xx, large pages (512kb or 8M) are used to map kernel linear
844 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
845 in that case. If PIN_TLB is selected, it must be aligned to 8M as
846 8M pages will be pinned.
848 config FORCE_MAX_ZONEORDER
849 int "Maximum zone order"
850 range 8 9 if PPC64 && PPC_64K_PAGES
851 default "9" if PPC64 && PPC_64K_PAGES
852 range 13 13 if PPC64 && !PPC_64K_PAGES
853 default "13" if PPC64 && !PPC_64K_PAGES
854 range 9 64 if PPC32 && PPC_16K_PAGES
855 default "9" if PPC32 && PPC_16K_PAGES
856 range 7 64 if PPC32 && PPC_64K_PAGES
857 default "7" if PPC32 && PPC_64K_PAGES
858 range 5 64 if PPC32 && PPC_256K_PAGES
859 default "5" if PPC32 && PPC_256K_PAGES
863 The kernel memory allocator divides physically contiguous memory
864 blocks into "zones", where each zone is a power of two number of
865 pages. This option selects the largest power of two that the kernel
866 keeps in the memory allocator. If you need to allocate very large
867 blocks of physically contiguous memory, then you may need to
870 This config option is actually maximum order plus one. For example,
871 a value of 11 means that the largest free memory block is 2^10 pages.
873 The page size is not necessarily 4KB. For example, on 64-bit
874 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
875 this in mind when choosing a value for this option.
877 config PPC_SUBPAGE_PROT
878 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
880 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
882 This option adds support for system call to allow user programs
883 to set access permissions (read/write, readonly, or no access)
884 on the 4k subpages of each 64k page.
886 If unsure, say N here.
888 config PPC_PROT_SAO_LPAR
889 bool "Support PROT_SAO mappings in LPARs"
890 depends on PPC_BOOK3S_64
892 This option adds support for PROT_SAO mappings from userspace
893 inside LPARs on supported CPUs.
895 This may cause issues when performing guest migration from
896 a CPU that supports SAO to one that does not.
898 If unsure, say N here.
900 config PPC_COPRO_BASE
904 bool "SMT (Hyperthreading) scheduler support"
905 depends on PPC64 && SMP
907 SMT scheduler support improves the CPU scheduler's decision making
908 when dealing with POWER5 cpus at a cost of slightly increased
909 overhead in some places. If unsure say N here.
911 config PPC_DENORMALISATION
912 bool "PowerPC denormalisation exception handling"
913 depends on PPC_BOOK3S_64
914 default "y" if PPC_POWERNV
916 Add support for handling denormalisation of single precision
917 values. Useful for bare metal only. If unsure say Y here.
920 string "Initial kernel command string"
923 On some platforms, there is currently no way for the boot loader to
924 pass arguments to the kernel. For these platforms, you can supply
925 some command-line options at build time by entering them here. In
926 most cases you will need to specify the root device here.
929 prompt "Kernel command line type" if CMDLINE != ""
930 default CMDLINE_FROM_BOOTLOADER
932 config CMDLINE_FROM_BOOTLOADER
933 bool "Use bootloader kernel arguments if available"
935 Uses the command-line options passed by the boot loader. If
936 the boot loader doesn't provide any, the default kernel command
937 string provided in CMDLINE will be used.
939 config CMDLINE_EXTEND
940 bool "Extend bootloader kernel arguments"
942 The command-line arguments provided by the boot loader will be
943 appended to the default kernel command string.
946 bool "Always use the default kernel command string"
948 Always use the default kernel command string, even if the boot
949 loader passes other arguments to the kernel.
950 This is useful if you cannot or don't want to change the
951 command-line options your boot loader passes to the kernel.
956 string "Additional default image types"
958 List additional targets to be built by the bootwrapper here (separated
959 by spaces). This is useful for targets that depend of device tree
960 files in the .dts directory.
962 Targets in this list will be build as part of the default build
963 target, or when the user does a 'make zImage' or a
964 'make zImage.initrd'.
966 If unsure, leave blank
968 config ARCH_WANTS_FREEZER_CONTROL
972 source "kernel/power/Kconfig"
975 prompt "PowerPC Memory Protection Keys"
977 depends on PPC_BOOK3S_64
978 depends on PPC_64S_HASH_MMU
979 select ARCH_USES_HIGH_VMA_FLAGS
980 select ARCH_HAS_PKEYS
982 Memory Protection Keys provides a mechanism for enforcing
983 page-based protections, but without requiring modification of the
984 page tables when an application changes protection domains.
986 For details, see Documentation/core-api/protection-keys.rst
990 config PPC_SECURE_BOOT
991 prompt "Enable secure boot support"
993 depends on PPC_POWERNV || PPC_PSERIES
994 depends on IMA_ARCH_POLICY
995 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
997 Systems with firmware secure boot enabled need to define security
998 policies to extend secure boot to the OS. This config allows a user
999 to enable OS secure boot on systems that have firmware support for
1000 it. If in doubt say N.
1002 config PPC_SECVAR_SYSFS
1003 bool "Enable sysfs interface for POWER secure variables"
1005 depends on PPC_SECURE_BOOT
1008 POWER secure variables are managed and controlled by firmware.
1009 These variables are exposed to userspace via sysfs to enable
1010 read/write operations on these variables. Say Y if you have
1011 secure boot enabled and want to expose variables to userspace.
1013 config PPC_RTAS_FILTER
1014 bool "Enable filtering of RTAS syscalls"
1018 The RTAS syscall API has security issues that could be used to
1019 compromise system integrity. This option enforces restrictions on the
1020 RTAS calls and arguments passed by userspace programs to mitigate
1023 Say Y unless you know what you are doing and the filter is causing
1035 bool "Support for ISA-bus hardware"
1039 Find out whether you have ISA slots on your motherboard. ISA is the
1040 name of a bus system, i.e. the way the CPU talks to the other stuff
1041 inside your box. If you have an Apple machine, say N here; if you
1042 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1043 embedded board, consult your board documentation.
1045 config GENERIC_ISA_DMA
1047 depends on ISA_DMA_API
1050 config PPC_INDIRECT_PCI
1053 default y if 40x || 44x
1063 select ARCH_HAS_DMA_SET_MASK
1064 select PPC_INDIRECT_PCI
1070 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1072 Freescale MPC85xx/MPC86xx power management controller support
1073 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1078 depends on SUSPEND && (44x || 40x)
1080 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1081 It also enables support for two different idle states (idle-wait
1088 bool "Freescale Local Bus support"
1090 Enables reporting of errors from the Freescale local bus
1091 controller. Also contains some common code used by
1092 drivers for specific local bus peripherals.
1096 depends on PPC_83xx || QUICC_ENGINE || CPM2
1098 Freescale General-purpose Timers support
1102 depends on PCI && 8260
1103 select PPC_INDIRECT_PCI
1107 bool "Freescale Embedded SRIO Controller support"
1108 depends on RAPIDIO = y && HAVE_RAPIDIO
1111 Include support for RapidIO controller on Freescale embedded
1112 processors (MPC8548, MPC8641, etc).
1116 config NONSTATIC_KERNEL
1119 menu "Advanced setup"
1122 config ADVANCED_OPTIONS
1123 bool "Prompt for advanced kernel configuration options"
1125 This option will enable prompting for a variety of advanced kernel
1126 configuration options. These options can cause the kernel to not
1127 work if they are set incorrectly, but can be used to optimize certain
1128 aspects of kernel memory management.
1130 Unless you know what you are doing, say N here.
1132 comment "Default settings for advanced configuration options are used"
1133 depends on !ADVANCED_OPTIONS
1135 config LOWMEM_SIZE_BOOL
1136 bool "Set maximum low memory"
1137 depends on ADVANCED_OPTIONS
1139 This option allows you to set the maximum amount of memory which
1140 will be used as "low memory", that is, memory which the kernel can
1141 access directly, without having to set up a kernel virtual mapping.
1142 This can be useful in optimizing the layout of kernel virtual
1145 Say N here unless you know what you are doing.
1148 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1149 default "0x30000000"
1151 config LOWMEM_CAM_NUM_BOOL
1152 bool "Set number of CAMs to use to map low memory"
1153 depends on ADVANCED_OPTIONS && FSL_BOOKE
1155 This option allows you to set the maximum number of CAM slots that
1156 will be used to map low memory. There are a limited number of slots
1157 available and even more limited number that will fit in the L1 MMU.
1158 However, using more entries will allow mapping more low memory. This
1159 can be useful in optimizing the layout of kernel virtual memory.
1161 Say N here unless you know what you are doing.
1163 config LOWMEM_CAM_NUM
1164 depends on FSL_BOOKE
1165 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1166 default 3 if !STRICT_KERNEL_RWX
1167 default 9 if DATA_SHIFT >= 24
1168 default 12 if DATA_SHIFT >= 22
1171 config DYNAMIC_MEMSTART
1172 bool "Enable page aligned dynamic load address for kernel"
1173 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1174 select NONSTATIC_KERNEL
1176 This option enables the kernel to be loaded at any page aligned
1177 physical address. The kernel creates a mapping from KERNELBASE to
1178 the address where the kernel is loaded. The page size here implies
1179 the TLB page size of the mapping for kernel on the particular platform.
1180 Please refer to the init code for finding the TLB page size.
1182 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1183 kernel image, where the only restriction is the page aligned kernel
1184 load address. When this option is enabled, the compile time physical
1185 address CONFIG_PHYSICAL_START is ignored.
1187 This option is overridden by CONFIG_RELOCATABLE
1189 config PAGE_OFFSET_BOOL
1190 bool "Set custom page offset address"
1191 depends on ADVANCED_OPTIONS
1193 This option allows you to set the kernel virtual address at which
1194 the kernel will map low memory. This can be useful in optimizing
1195 the virtual memory layout of the system.
1197 Say N here unless you know what you are doing.
1200 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1201 default "0xc0000000"
1203 config KERNEL_START_BOOL
1204 bool "Set custom kernel base address"
1205 depends on ADVANCED_OPTIONS
1207 This option allows you to set the kernel virtual address at which
1208 the kernel will be loaded. Normally this should match PAGE_OFFSET
1209 however there are times (like kdump) that one might not want them
1212 Say N here unless you know what you are doing.
1215 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1216 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1217 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1218 default "0xc0000000"
1220 config PHYSICAL_START_BOOL
1221 bool "Set physical address where the kernel is loaded"
1222 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1224 This gives the physical address where the kernel is loaded.
1226 Say N here unless you know what you are doing.
1228 config PHYSICAL_START
1229 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1230 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1231 default "0x00000000"
1233 config PHYSICAL_ALIGN
1235 default "0x04000000" if FSL_BOOKE
1237 This value puts the alignment restrictions on physical address
1238 where kernel is loaded and run from. Kernel is compiled for an
1239 address which meets above alignment restriction.
1241 config TASK_SIZE_BOOL
1242 bool "Set custom user task size"
1243 depends on ADVANCED_OPTIONS
1245 This option allows you to set the amount of virtual address space
1246 allocated to user tasks. This can be useful in optimizing the
1247 virtual memory layout of the system.
1249 Say N here unless you know what you are doing.
1252 hex "Size of user task space" if TASK_SIZE_BOOL
1253 default "0x80000000" if PPC_8xx
1254 default "0xb0000000" if PPC_BOOK3S_32
1255 default "0xc0000000"
1259 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1262 default "0xc000000000000000"
1265 default "0xc000000000000000"
1266 config PHYSICAL_START
1268 default "0x00000000"
1271 config PPC_LIB_RHEAP
1274 source "arch/powerpc/kvm/Kconfig"
1276 source "kernel/livepatch/Kconfig"