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 MMU_GATHER_MERGE_VMAS
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 ARCH_HAS_ADD_PAGES
364 depends on ARCH_ENABLE_MEMORY_HOTPLUG
366 config PPC_DCR_NATIVE
374 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
377 config PPC_OF_PLATFORM_PCI
380 depends on PPC64 # not supported on 32 bits yet
382 config ARCH_SUPPORTS_UPROBES
385 config PPC_ADV_DEBUG_REGS
387 depends on 40x || BOOKE
390 config PPC_ADV_DEBUG_IACS
392 depends on PPC_ADV_DEBUG_REGS
396 config PPC_ADV_DEBUG_DACS
398 depends on PPC_ADV_DEBUG_REGS
401 config PPC_ADV_DEBUG_DVCS
403 depends on PPC_ADV_DEBUG_REGS
407 config PPC_ADV_DEBUG_DAC_RANGE
409 depends on PPC_ADV_DEBUG_REGS && 44x
415 config PGTABLE_LEVELS
420 source "arch/powerpc/sysdev/Kconfig"
421 source "arch/powerpc/platforms/Kconfig"
423 menu "Kernel options"
426 bool "High memory support"
430 source "kernel/Kconfig.hz"
432 config MATH_EMULATION
433 bool "Math emulation"
434 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
437 Some PowerPC chips designed for embedded applications do not have
438 a floating-point unit and therefore do not implement the
439 floating-point instructions in the PowerPC instruction set. If you
440 say Y here, the kernel will include code to emulate a floating-point
441 unit, which will allow programs that use floating-point
444 This is also useful to emulate missing (optional) instructions
445 such as fsqrt on cores that do have an FPU but do not implement
446 them (such as Freescale BookE).
449 prompt "Math emulation options"
450 default MATH_EMULATION_FULL
451 depends on MATH_EMULATION
453 config MATH_EMULATION_FULL
454 bool "Emulate all the floating point instructions"
456 Select this option will enable the kernel to support to emulate
457 all the floating point instructions. If your SoC doesn't have
458 a FPU, you should select this.
460 config MATH_EMULATION_HW_UNIMPLEMENTED
461 bool "Just emulate the FPU unimplemented instructions"
463 Select this if you know there does have a hardware FPU on your
464 SoC, but some floating point instructions are not implemented by that.
468 config PPC_TRANSACTIONAL_MEM
469 bool "Transactional Memory support for POWERPC"
470 depends on PPC_BOOK3S_64
475 Support user-mode Transactional Memory on POWERPC.
478 bool "Ultravisor support"
479 depends on KVM_BOOK3S_HV_POSSIBLE
480 depends on DEVICE_PRIVATE
483 This option paravirtualizes the kernel to run in POWER platforms that
484 supports the Protected Execution Facility (PEF). On such platforms,
485 the ultravisor firmware runs at a privilege level above the
490 config LD_HEAD_STUB_CATCH
491 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
494 Very large kernels can cause linker branch stubs to be generated by
495 code in head_64.S, which moves the head text sections out of their
496 specified location. This option can work around the problem.
500 config MPROFILE_KERNEL
501 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
502 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
505 bool "Support for enabling/disabling CPUs"
506 depends on SMP && (PPC_PSERIES || \
507 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
509 Say Y here to be able to disable and re-enable individual
510 CPUs at runtime on SMP machines.
512 Say N if you are unsure.
514 config PPC_QUEUED_SPINLOCKS
515 bool "Queued spinlocks" if EXPERT
517 default PPC_BOOK3S_64
519 Say Y here to use queued spinlocks which give better scalability and
520 fairness on large SMP and NUMA systems without harming single threaded
523 config ARCH_CPU_PROBE_RELEASE
525 depends on HOTPLUG_CPU
527 config PPC64_SUPPORTS_MEMORY_FAILURE
528 bool "Add support for memory hwpoison"
529 depends on PPC_BOOK3S_64
530 default "y" if PPC_POWERNV
531 select ARCH_SUPPORTS_MEMORY_FAILURE
534 bool "kexec system call"
535 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
538 kexec is a system call that implements the ability to shutdown your
539 current kernel, and to start another kernel. It is like a reboot
540 but it is independent of the system firmware. And like a reboot
541 you can start any kernel with it, not just Linux.
543 The name comes from the similarity to the exec system call.
545 It is an ongoing process to be certain the hardware in a machine
546 is properly shutdown, so do not be surprised if this code does not
547 initially work for you. As of this writing the exact hardware
548 interface is strongly in flux, so no good recommendation can be
552 bool "kexec file based system call"
554 select HAVE_IMA_KEXEC if IMA
559 depends on CRYPTO_SHA256=y
561 This is a new version of the kexec system call. This call is
562 file based and takes in file descriptors as system call arguments
563 for kernel and initramfs as opposed to a list of segments as is the
564 case for the older kexec call.
566 config ARCH_HAS_KEXEC_PURGATORY
570 bool "Build a relocatable kernel"
571 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
572 select NONSTATIC_KERNEL
574 This builds a kernel image that is capable of running at the
575 location the kernel is loaded at. For ppc32, there is no any
576 alignment restrictions, and this feature is a superset of
577 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
578 16k-aligned base address. The kernel is linked as a
579 position-independent executable (PIE) and contains dynamic relocations
580 which are processed early in the bootup process.
582 One use is for the kexec on panic case where the recovery kernel
583 must live at a different physical address than the primary
586 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
587 it has been loaded at and the compile time physical addresses
588 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
589 setting can still be useful to bootwrappers that need to know the
590 load address of the kernel (eg. u-boot/mkimage).
592 config RANDOMIZE_BASE
593 bool "Randomize the address of the kernel image"
594 depends on (FSL_BOOKE && FLATMEM && PPC32)
595 depends on RELOCATABLE
597 Randomizes the virtual address at which the kernel image is
598 loaded, as a security feature that deters exploit attempts
599 relying on knowledge of the location of kernel internals.
603 config RELOCATABLE_TEST
604 bool "Test relocatable kernel"
605 depends on (PPC64 && RELOCATABLE)
607 This runs the relocatable kernel at the address it was initially
608 loaded at, which tends to be non-zero and therefore test the
612 bool "Build a dump capture kernel"
613 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
614 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
616 Build a kernel suitable for use as a dump capture kernel.
617 The same kernel binary can be used as production kernel and dump
621 bool "Firmware-assisted dump"
622 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
626 A robust mechanism to get reliable kernel crash dump with
627 assistance from firmware. This approach does not use kexec,
628 instead firmware assists in booting the capture kernel
629 while preserving memory contents. Firmware-assisted dump
630 is meant to be a kdump replacement offering robustness and
631 speed not possible without system firmware assistance.
633 If unsure, say "y". Only special kernels like petitboot may
634 need to say "N" here.
636 config PRESERVE_FA_DUMP
637 bool "Preserve Firmware-assisted dump"
638 depends on PPC64 && PPC_POWERNV && !FA_DUMP
640 On a kernel with FA_DUMP disabled, this option helps to preserve
641 crash data from a previously crash'ed kernel. Useful when the next
642 memory preserving kernel boot would process this crash data.
643 Petitboot kernel is the typical usecase for this option.
646 bool "Export OPAL memory as /sys/firmware/opal/core"
647 depends on PPC64 && PPC_POWERNV
649 This option uses the MPIPL support in firmware to provide an
650 ELF core of OPAL memory after a crash. The ELF core is exported
651 as /sys/firmware/opal/core file which is helpful in debugging
652 OPAL crashes using GDB.
655 bool "Distribute interrupts on all CPUs by default"
658 This option gives the kernel permission to distribute IRQs across
659 multiple CPUs. Saying N here will route all IRQs to the first
660 CPU. Generally saying Y is safe, although some problems have been
661 reported with SMP Power Macintoshes with this option enabled.
664 bool "NUMA Memory Allocation and Scheduler Support"
665 depends on PPC64 && SMP
666 default y if PPC_PSERIES || PPC_POWERNV
667 select USE_PERCPU_NUMA_NODE_ID
669 Enable NUMA (Non-Uniform Memory Access) support.
671 The kernel will try to allocate memory used by a CPU on the
672 local memory controller of the CPU and add some more
673 NUMA awareness to the kernel.
681 config HAVE_MEMORYLESS_NODES
685 config ARCH_SELECT_MEMORY_MODEL
689 config ARCH_FLATMEM_ENABLE
691 depends on (PPC64 && !NUMA) || PPC32
693 config ARCH_SPARSEMEM_ENABLE
696 select SPARSEMEM_VMEMMAP_ENABLE
698 config ARCH_SPARSEMEM_DEFAULT
700 depends on PPC_BOOK3S_64
702 config ILLEGAL_POINTER_VALUE
704 # This is roughly half way between the top of user space and the bottom
705 # of kernel space, which seems about as good as we can get.
706 default 0x5deadbeef0000000 if PPC64
709 config ARCH_MEMORY_PROBE
711 depends on MEMORY_HOTPLUG
715 default PPC_64K_PAGES if PPC_BOOK3S_64
718 Select the kernel logical page size. Increasing the page size
719 will reduce software overhead at each page boundary, allow
720 hardware prefetch mechanisms to be more effective, and allow
721 larger dma transfers increasing IO efficiency and reducing
722 overhead. However the utilization of memory will increase.
723 For example, each cached file will using a multiple of the
724 page size to hold its contents and the difference between the
725 end of file and the end of page is wasted.
727 Some dedicated systems, such as software raid serving with
728 accelerated calculations, have shown significant increases.
730 If you configure a 64 bit kernel for 64k pages but the
731 processor does not support them, then the kernel will simulate
732 them with 4k pages, loading them on demand, but with the
733 reduced software overhead and larger internal fragmentation.
734 For the 32 bit kernel, a large page option will not be offered
735 unless it is supported by the configured processor.
737 If unsure, choose 4K_PAGES.
741 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
745 depends on 44x || PPC_8xx
749 depends on 44x || PPC_BOOK3S_64
750 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
752 config PPC_256K_PAGES
753 bool "256k page size (Requires non-standard binutils settings)"
754 depends on 44x && !PPC_47x
756 Make the page size 256k.
758 The kernel will only be able to run applications that have been
759 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
760 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
761 definition from 0x10000 to 0x40000 in older versions.
767 depends on PPC_4K_PAGES
769 config PAGE_SIZE_16KB
771 depends on PPC_16K_PAGES
773 config PAGE_SIZE_64KB
775 depends on PPC_64K_PAGES
777 config PAGE_SIZE_256KB
779 depends on PPC_256K_PAGES
781 config PPC_PAGE_SHIFT
783 default 18 if PPC_256K_PAGES
784 default 16 if PPC_64K_PAGES
785 default 14 if PPC_16K_PAGES
789 int "Thread shift" if EXPERT
791 default "15" if PPC_256K_PAGES
792 default "14" if PPC64
795 Used to define the stack size. The default is almost always what you
796 want. Only change this if you know what you are doing.
798 config DATA_SHIFT_BOOL
799 bool "Set custom data alignment"
800 depends on ADVANCED_OPTIONS
801 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
802 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
805 This option allows you to set the kernel data alignment. When
806 RAM is mapped by blocks, the alignment needs to fit the size and
807 number of possible blocks. The default should be OK for most configs.
809 Say N here unless you know what you are doing.
812 int "Data shift" if DATA_SHIFT_BOOL
813 default 24 if STRICT_KERNEL_RWX && PPC64
814 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
815 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
816 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
817 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
818 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
819 default 23 if STRICT_KERNEL_RWX && PPC_8xx
820 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
821 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
822 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
823 default PPC_PAGE_SHIFT
825 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
826 Smaller is the alignment, greater is the number of necessary DBATs.
828 On 8xx, large pages (512kb or 8M) are used to map kernel linear
829 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
830 in that case. If PIN_TLB is selected, it must be aligned to 8M as
831 8M pages will be pinned.
833 config FORCE_MAX_ZONEORDER
834 int "Maximum zone order"
835 range 8 9 if PPC64 && PPC_64K_PAGES
836 default "9" if PPC64 && PPC_64K_PAGES
837 range 13 13 if PPC64 && !PPC_64K_PAGES
838 default "13" if PPC64 && !PPC_64K_PAGES
839 range 9 64 if PPC32 && PPC_16K_PAGES
840 default "9" if PPC32 && PPC_16K_PAGES
841 range 7 64 if PPC32 && PPC_64K_PAGES
842 default "7" if PPC32 && PPC_64K_PAGES
843 range 5 64 if PPC32 && PPC_256K_PAGES
844 default "5" if PPC32 && PPC_256K_PAGES
848 The kernel memory allocator divides physically contiguous memory
849 blocks into "zones", where each zone is a power of two number of
850 pages. This option selects the largest power of two that the kernel
851 keeps in the memory allocator. If you need to allocate very large
852 blocks of physically contiguous memory, then you may need to
855 This config option is actually maximum order plus one. For example,
856 a value of 11 means that the largest free memory block is 2^10 pages.
858 The page size is not necessarily 4KB. For example, on 64-bit
859 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
860 this in mind when choosing a value for this option.
862 config PPC_SUBPAGE_PROT
863 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
865 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
867 This option adds support for system call to allow user programs
868 to set access permissions (read/write, readonly, or no access)
869 on the 4k subpages of each 64k page.
871 If unsure, say N here.
873 config PPC_PROT_SAO_LPAR
874 bool "Support PROT_SAO mappings in LPARs"
875 depends on PPC_BOOK3S_64
877 This option adds support for PROT_SAO mappings from userspace
878 inside LPARs on supported CPUs.
880 This may cause issues when performing guest migration from
881 a CPU that supports SAO to one that does not.
883 If unsure, say N here.
885 config PPC_COPRO_BASE
889 bool "SMT (Hyperthreading) scheduler support"
890 depends on PPC64 && SMP
892 SMT scheduler support improves the CPU scheduler's decision making
893 when dealing with POWER5 cpus at a cost of slightly increased
894 overhead in some places. If unsure say N here.
896 config PPC_DENORMALISATION
897 bool "PowerPC denormalisation exception handling"
898 depends on PPC_BOOK3S_64
899 default "y" if PPC_POWERNV
901 Add support for handling denormalisation of single precision
902 values. Useful for bare metal only. If unsure say Y here.
905 string "Initial kernel command string"
908 On some platforms, there is currently no way for the boot loader to
909 pass arguments to the kernel. For these platforms, you can supply
910 some command-line options at build time by entering them here. In
911 most cases you will need to specify the root device here.
914 prompt "Kernel command line type" if CMDLINE != ""
915 default CMDLINE_FROM_BOOTLOADER
917 config CMDLINE_FROM_BOOTLOADER
918 bool "Use bootloader kernel arguments if available"
920 Uses the command-line options passed by the boot loader. If
921 the boot loader doesn't provide any, the default kernel command
922 string provided in CMDLINE will be used.
924 config CMDLINE_EXTEND
925 bool "Extend bootloader kernel arguments"
927 The command-line arguments provided by the boot loader will be
928 appended to the default kernel command string.
931 bool "Always use the default kernel command string"
933 Always use the default kernel command string, even if the boot
934 loader passes other arguments to the kernel.
935 This is useful if you cannot or don't want to change the
936 command-line options your boot loader passes to the kernel.
941 string "Additional default image types"
943 List additional targets to be built by the bootwrapper here (separated
944 by spaces). This is useful for targets that depend of device tree
945 files in the .dts directory.
947 Targets in this list will be build as part of the default build
948 target, or when the user does a 'make zImage' or a
949 'make zImage.initrd'.
951 If unsure, leave blank
953 config ARCH_WANTS_FREEZER_CONTROL
957 source "kernel/power/Kconfig"
960 prompt "PowerPC Memory Protection Keys"
962 depends on PPC_BOOK3S_64
963 depends on PPC_64S_HASH_MMU
964 select ARCH_USES_HIGH_VMA_FLAGS
965 select ARCH_HAS_PKEYS
967 Memory Protection Keys provides a mechanism for enforcing
968 page-based protections, but without requiring modification of the
969 page tables when an application changes protection domains.
971 For details, see Documentation/core-api/protection-keys.rst
975 config PPC_SECURE_BOOT
976 prompt "Enable secure boot support"
978 depends on PPC_POWERNV || PPC_PSERIES
979 depends on IMA_ARCH_POLICY
980 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
982 Systems with firmware secure boot enabled need to define security
983 policies to extend secure boot to the OS. This config allows a user
984 to enable OS secure boot on systems that have firmware support for
985 it. If in doubt say N.
987 config PPC_SECVAR_SYSFS
988 bool "Enable sysfs interface for POWER secure variables"
990 depends on PPC_SECURE_BOOT
993 POWER secure variables are managed and controlled by firmware.
994 These variables are exposed to userspace via sysfs to enable
995 read/write operations on these variables. Say Y if you have
996 secure boot enabled and want to expose variables to userspace.
998 config PPC_RTAS_FILTER
999 bool "Enable filtering of RTAS syscalls"
1003 The RTAS syscall API has security issues that could be used to
1004 compromise system integrity. This option enforces restrictions on the
1005 RTAS calls and arguments passed by userspace programs to mitigate
1008 Say Y unless you know what you are doing and the filter is causing
1020 bool "Support for ISA-bus hardware"
1024 Find out whether you have ISA slots on your motherboard. ISA is the
1025 name of a bus system, i.e. the way the CPU talks to the other stuff
1026 inside your box. If you have an Apple machine, say N here; if you
1027 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1028 embedded board, consult your board documentation.
1030 config GENERIC_ISA_DMA
1032 depends on ISA_DMA_API
1035 config PPC_INDIRECT_PCI
1038 default y if 40x || 44x
1048 select ARCH_HAS_DMA_SET_MASK
1049 select PPC_INDIRECT_PCI
1055 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1057 Freescale MPC85xx/MPC86xx power management controller support
1058 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1063 depends on SUSPEND && (44x || 40x)
1065 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1066 It also enables support for two different idle states (idle-wait
1073 bool "Freescale Local Bus support"
1075 Enables reporting of errors from the Freescale local bus
1076 controller. Also contains some common code used by
1077 drivers for specific local bus peripherals.
1081 depends on PPC_83xx || QUICC_ENGINE || CPM2
1083 Freescale General-purpose Timers support
1087 depends on PCI && 8260
1088 select PPC_INDIRECT_PCI
1092 bool "Freescale Embedded SRIO Controller support"
1093 depends on RAPIDIO = y && HAVE_RAPIDIO
1096 Include support for RapidIO controller on Freescale embedded
1097 processors (MPC8548, MPC8641, etc).
1101 config NONSTATIC_KERNEL
1104 menu "Advanced setup"
1107 config ADVANCED_OPTIONS
1108 bool "Prompt for advanced kernel configuration options"
1110 This option will enable prompting for a variety of advanced kernel
1111 configuration options. These options can cause the kernel to not
1112 work if they are set incorrectly, but can be used to optimize certain
1113 aspects of kernel memory management.
1115 Unless you know what you are doing, say N here.
1117 comment "Default settings for advanced configuration options are used"
1118 depends on !ADVANCED_OPTIONS
1120 config LOWMEM_SIZE_BOOL
1121 bool "Set maximum low memory"
1122 depends on ADVANCED_OPTIONS
1124 This option allows you to set the maximum amount of memory which
1125 will be used as "low memory", that is, memory which the kernel can
1126 access directly, without having to set up a kernel virtual mapping.
1127 This can be useful in optimizing the layout of kernel virtual
1130 Say N here unless you know what you are doing.
1133 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1134 default "0x30000000"
1136 config LOWMEM_CAM_NUM_BOOL
1137 bool "Set number of CAMs to use to map low memory"
1138 depends on ADVANCED_OPTIONS && FSL_BOOKE
1140 This option allows you to set the maximum number of CAM slots that
1141 will be used to map low memory. There are a limited number of slots
1142 available and even more limited number that will fit in the L1 MMU.
1143 However, using more entries will allow mapping more low memory. This
1144 can be useful in optimizing the layout of kernel virtual memory.
1146 Say N here unless you know what you are doing.
1148 config LOWMEM_CAM_NUM
1149 depends on FSL_BOOKE
1150 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1151 default 3 if !STRICT_KERNEL_RWX
1152 default 9 if DATA_SHIFT >= 24
1153 default 12 if DATA_SHIFT >= 22
1156 config DYNAMIC_MEMSTART
1157 bool "Enable page aligned dynamic load address for kernel"
1158 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1159 select NONSTATIC_KERNEL
1161 This option enables the kernel to be loaded at any page aligned
1162 physical address. The kernel creates a mapping from KERNELBASE to
1163 the address where the kernel is loaded. The page size here implies
1164 the TLB page size of the mapping for kernel on the particular platform.
1165 Please refer to the init code for finding the TLB page size.
1167 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1168 kernel image, where the only restriction is the page aligned kernel
1169 load address. When this option is enabled, the compile time physical
1170 address CONFIG_PHYSICAL_START is ignored.
1172 This option is overridden by CONFIG_RELOCATABLE
1174 config PAGE_OFFSET_BOOL
1175 bool "Set custom page offset address"
1176 depends on ADVANCED_OPTIONS
1178 This option allows you to set the kernel virtual address at which
1179 the kernel will map low memory. This can be useful in optimizing
1180 the virtual memory layout of the system.
1182 Say N here unless you know what you are doing.
1185 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1186 default "0xc0000000"
1188 config KERNEL_START_BOOL
1189 bool "Set custom kernel base address"
1190 depends on ADVANCED_OPTIONS
1192 This option allows you to set the kernel virtual address at which
1193 the kernel will be loaded. Normally this should match PAGE_OFFSET
1194 however there are times (like kdump) that one might not want them
1197 Say N here unless you know what you are doing.
1200 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1201 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1202 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1203 default "0xc0000000"
1205 config PHYSICAL_START_BOOL
1206 bool "Set physical address where the kernel is loaded"
1207 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1209 This gives the physical address where the kernel is loaded.
1211 Say N here unless you know what you are doing.
1213 config PHYSICAL_START
1214 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1215 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1216 default "0x00000000"
1218 config PHYSICAL_ALIGN
1220 default "0x04000000" if FSL_BOOKE
1222 This value puts the alignment restrictions on physical address
1223 where kernel is loaded and run from. Kernel is compiled for an
1224 address which meets above alignment restriction.
1226 config TASK_SIZE_BOOL
1227 bool "Set custom user task size"
1228 depends on ADVANCED_OPTIONS
1230 This option allows you to set the amount of virtual address space
1231 allocated to user tasks. This can be useful in optimizing the
1232 virtual memory layout of the system.
1234 Say N here unless you know what you are doing.
1237 hex "Size of user task space" if TASK_SIZE_BOOL
1238 default "0x80000000" if PPC_8xx
1239 default "0xb0000000" if PPC_BOOK3S_32
1240 default "0xc0000000"
1244 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1247 default "0xc000000000000000"
1250 default "0xc000000000000000"
1251 config PHYSICAL_START
1253 default "0x00000000"
1259 config PPC_LIB_RHEAP
1262 source "arch/powerpc/kvm/Kconfig"
1264 source "kernel/livepatch/Kconfig"