1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
16 config ARCH_MMAP_RND_BITS_MAX
17 # On Book3S 64, the default virtual address space for 64-bit processes
18 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
19 # 32T of address space (2^45), which should ensure a reasonable gap
20 # between bottom-up and top-down allocations for applications that
21 # consume "normal" amounts of address space. Book3S 64 only supports 64K
23 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
24 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
26 # On all other 64-bit platforms (currently only Book3E), the virtual
27 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
28 # of address space (2^44). Only 4K page sizes are supported.
29 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
31 # For 32-bit, use the compat values, as they're the same.
32 default ARCH_MMAP_RND_COMPAT_BITS_MAX
34 config ARCH_MMAP_RND_BITS_MIN
35 # Allow randomisation to consume up to 1GB of address space (2^30).
36 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
37 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
39 # For 32-bit, use the compat values, as they're the same.
40 default ARCH_MMAP_RND_COMPAT_BITS_MIN
42 config ARCH_MMAP_RND_COMPAT_BITS_MAX
43 # Total virtual address space for 32-bit processes is 2^31 (2GB).
44 # Allow randomisation to consume up to 512MB of address space (2^29).
45 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
46 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
47 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
48 default 17 # 17 = 29 (512MB) - 12 (4K)
50 config ARCH_MMAP_RND_COMPAT_BITS_MIN
51 # Total virtual address space for 32-bit processes is 2^31 (2GB).
52 # Allow randomisation to consume up to 8MB of address space (2^23).
53 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
54 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
55 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
56 default 11 # 11 = 23 (8MB) - 12 (4K)
58 config HAVE_SETUP_PER_CPU_AREA
61 config NEED_PER_CPU_EMBED_FIRST_CHUNK
64 config NEED_PER_CPU_PAGE_FIRST_CHUNK
68 int "Number of virtual interrupt numbers"
72 This defines the number of virtual interrupt numbers the kernel
73 can manage. Virtual interrupt numbers are what you see in
74 /proc/interrupts. If you configure your system to have too few,
75 drivers will fail to load or worse - handle with care.
79 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
84 depends on HARDLOCKUP_DETECTOR
85 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
88 This is a placeholder when the powerpc hardlockup detector
89 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
90 selected via the generic lockup detector menu which is why we
91 have no standalone config option for it here.
93 config STACKTRACE_SUPPORT
97 config TRACE_IRQFLAGS_SUPPORT
101 config LOCKDEP_SUPPORT
105 config GENERIC_LOCKBREAK
108 depends on SMP && PREEMPTION
110 config GENERIC_HWEIGHT
118 # Please keep this list sorted alphabetically.
120 select ARCH_32BIT_OFF_T if PPC32
121 select ARCH_ENABLE_MEMORY_HOTPLUG
122 select ARCH_ENABLE_MEMORY_HOTREMOVE
123 select ARCH_HAS_COPY_MC if PPC64
124 select ARCH_HAS_DEBUG_VIRTUAL
125 select ARCH_HAS_DEBUG_VM_PGTABLE
126 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
127 select ARCH_HAS_DEVMEM_IS_ALLOWED
128 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
129 select ARCH_HAS_ELF_RANDOMIZE
130 select ARCH_HAS_FORTIFY_SOURCE
131 select ARCH_HAS_GCOV_PROFILE_ALL
132 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
134 select ARCH_HAS_MEMBARRIER_CALLBACKS
135 select ARCH_HAS_MEMBARRIER_SYNC_CORE
136 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
137 select ARCH_HAS_MMIOWB if PPC64
138 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
139 select ARCH_HAS_PHYS_TO_DMA
140 select ARCH_HAS_PMEM_API
141 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
142 select ARCH_HAS_PTE_SPECIAL
143 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
144 select ARCH_HAS_SET_MEMORY
145 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION)
146 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX && !PPC_BOOK3S_32
147 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
148 select ARCH_HAS_UACCESS_FLUSHCACHE
149 select ARCH_HAS_UBSAN_SANITIZE_ALL
150 select ARCH_HAVE_NMI_SAFE_CMPXCHG
151 select ARCH_KEEP_MEMBLOCK
152 select ARCH_MIGHT_HAVE_PC_PARPORT
153 select ARCH_MIGHT_HAVE_PC_SERIO
154 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
155 select ARCH_STACKWALK
156 select ARCH_SUPPORTS_ATOMIC_RMW
157 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
158 select ARCH_USE_BUILTIN_BSWAP
159 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
160 select ARCH_USE_MEMTEST
161 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
162 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
163 select ARCH_WANT_IPC_PARSE_VERSION
164 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
165 select ARCH_WANT_LD_ORPHAN_WARN
166 select ARCH_WEAK_RELEASE_ACQUIRE
168 select BUILDTIME_TABLE_SORT
169 select CLONE_BACKWARDS
170 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
171 select DMA_OPS_BYPASS if PPC64
172 select DMA_OPS if PPC64
173 select DYNAMIC_FTRACE if FUNCTION_TRACER
174 select EDAC_ATOMIC_SCRUB
176 select GENERIC_ATOMIC64 if PPC32
177 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
178 select GENERIC_CMOS_UPDATE
179 select GENERIC_CPU_AUTOPROBE
180 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
181 select GENERIC_EARLY_IOREMAP
182 select GENERIC_GETTIMEOFDAY
183 select GENERIC_IRQ_SHOW
184 select GENERIC_IRQ_SHOW_LEVEL
185 select GENERIC_PCI_IOMAP if PCI
186 select GENERIC_PTDUMP
187 select GENERIC_SMP_IDLE_THREAD
188 select GENERIC_STRNCPY_FROM_USER
189 select GENERIC_STRNLEN_USER
190 select GENERIC_TIME_VSYSCALL
191 select GENERIC_VDSO_TIME_NS
192 select HAVE_ARCH_AUDITSYSCALL
193 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
194 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
195 select HAVE_ARCH_JUMP_LABEL
196 select HAVE_ARCH_JUMP_LABEL_RELATIVE
197 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
198 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
199 select HAVE_ARCH_KFENCE if PPC32
200 select HAVE_ARCH_KGDB
201 select HAVE_ARCH_MMAP_RND_BITS
202 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
203 select HAVE_ARCH_NVRAM_OPS
204 select HAVE_ARCH_SECCOMP_FILTER
205 select HAVE_ARCH_TRACEHOOK
206 select HAVE_ASM_MODVERSIONS
207 select HAVE_CONTEXT_TRACKING if PPC64
208 select HAVE_C_RECORDMCOUNT
209 select HAVE_DEBUG_KMEMLEAK
210 select HAVE_DEBUG_STACKOVERFLOW
211 select HAVE_DYNAMIC_FTRACE
212 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
214 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
216 select HAVE_FTRACE_MCOUNT_RECORD
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)
226 select HAVE_IOREMAP_PROT
227 select HAVE_IRQ_EXIT_ON_IRQ_STACK
228 select HAVE_IRQ_TIME_ACCOUNTING
229 select HAVE_KERNEL_GZIP
230 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
231 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
232 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
234 select HAVE_KPROBES_ON_FTRACE
235 select HAVE_KRETPROBES
236 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
237 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
238 select HAVE_MOD_ARCH_SPECIFIC
239 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
240 select HAVE_OPTPROBES
241 select HAVE_PERF_EVENTS
242 select HAVE_PERF_EVENTS_NMI if PPC64
243 select HAVE_PERF_REGS
244 select HAVE_PERF_USER_STACK_DUMP
245 select HAVE_REGS_AND_STACK_ACCESS_API
246 select HAVE_RELIABLE_STACKTRACE
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_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_SG_DMA_LENGTH
263 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
264 select OF_EARLY_FLATTREE
265 select OLD_SIGACTION if PPC32
266 select OLD_SIGSUSPEND
267 select PCI_DOMAINS if PCI
268 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
269 select PCI_SYSCALL if PCI
270 select PPC_DAWR if PPC64
273 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
274 select SYSCTL_EXCEPTION_TRACE
275 select THREAD_INFO_IN_TASK
276 select VIRT_TO_BUS if !PPC64
278 # Please keep this list sorted alphabetically.
281 config PPC_BARRIER_NOSPEC
284 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
295 bool "Enable support for 32bit binaries"
297 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
298 default y if !CPU_LITTLE_ENDIAN
299 select ARCH_WANT_OLD_COMPAT_IPC
300 select COMPAT_OLD_SIGACTION
302 config SYSVIPC_COMPAT
304 depends on COMPAT && SYSVIPC
307 config SCHED_OMIT_FRAME_POINTER
311 config ARCH_MAY_HAVE_PC_FDC
315 config PPC_UDBG_16550
318 config GENERIC_TBSYNC
320 default y if PPC32 && SMP
331 config GENERIC_BUG_RELATIVE_POINTERS
333 depends on GENERIC_BUG
335 config SYS_SUPPORTS_APM_EMULATION
336 default y if PMAC_APM_EMU
342 Used to allow a board to specify it wants an ePAPR compliant wrapper.
344 config DEFAULT_UIMAGE
347 Used to allow a board to specify it wants a uImage built by default
349 config ARCH_HIBERNATION_POSSIBLE
353 config ARCH_SUSPEND_POSSIBLE
355 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
356 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
359 config ARCH_SUSPEND_NONZERO_CPU
361 depends on PPC_POWERNV || PPC_PSERIES
363 config PPC_DCR_NATIVE
371 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
374 config PPC_OF_PLATFORM_PCI
377 depends on PPC64 # not supported on 32 bits yet
379 config ARCH_SUPPORTS_UPROBES
382 config PPC_ADV_DEBUG_REGS
384 depends on 40x || BOOKE
387 config PPC_ADV_DEBUG_IACS
389 depends on PPC_ADV_DEBUG_REGS
393 config PPC_ADV_DEBUG_DACS
395 depends on PPC_ADV_DEBUG_REGS
398 config PPC_ADV_DEBUG_DVCS
400 depends on PPC_ADV_DEBUG_REGS
404 config PPC_ADV_DEBUG_DAC_RANGE
406 depends on PPC_ADV_DEBUG_REGS && 44x
412 config PGTABLE_LEVELS
417 source "arch/powerpc/sysdev/Kconfig"
418 source "arch/powerpc/platforms/Kconfig"
420 menu "Kernel options"
423 bool "High memory support"
427 source "kernel/Kconfig.hz"
429 config MATH_EMULATION
430 bool "Math emulation"
431 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
434 Some PowerPC chips designed for embedded applications do not have
435 a floating-point unit and therefore do not implement the
436 floating-point instructions in the PowerPC instruction set. If you
437 say Y here, the kernel will include code to emulate a floating-point
438 unit, which will allow programs that use floating-point
441 This is also useful to emulate missing (optional) instructions
442 such as fsqrt on cores that do have an FPU but do not implement
443 them (such as Freescale BookE).
446 prompt "Math emulation options"
447 default MATH_EMULATION_FULL
448 depends on MATH_EMULATION
450 config MATH_EMULATION_FULL
451 bool "Emulate all the floating point instructions"
453 Select this option will enable the kernel to support to emulate
454 all the floating point instructions. If your SoC doesn't have
455 a FPU, you should select this.
457 config MATH_EMULATION_HW_UNIMPLEMENTED
458 bool "Just emulate the FPU unimplemented instructions"
460 Select this if you know there does have a hardware FPU on your
461 SoC, but some floating point instructions are not implemented by that.
465 config PPC_TRANSACTIONAL_MEM
466 bool "Transactional Memory support for POWERPC"
467 depends on PPC_BOOK3S_64
472 Support user-mode Transactional Memory on POWERPC.
475 bool "Ultravisor support"
476 depends on KVM_BOOK3S_HV_POSSIBLE
477 depends on DEVICE_PRIVATE
480 This option paravirtualizes the kernel to run in POWER platforms that
481 supports the Protected Execution Facility (PEF). On such platforms,
482 the ultravisor firmware runs at a privilege level above the
487 config LD_HEAD_STUB_CATCH
488 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
491 Very large kernels can cause linker branch stubs to be generated by
492 code in head_64.S, which moves the head text sections out of their
493 specified location. This option can work around the problem.
497 config MPROFILE_KERNEL
498 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
499 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
502 bool "Support for enabling/disabling CPUs"
503 depends on SMP && (PPC_PSERIES || \
504 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
506 Say Y here to be able to disable and re-enable individual
507 CPUs at runtime on SMP machines.
509 Say N if you are unsure.
511 config PPC_QUEUED_SPINLOCKS
512 bool "Queued spinlocks" if EXPERT
514 default PPC_BOOK3S_64
516 Say Y here to use queued spinlocks which give better scalability and
517 fairness on large SMP and NUMA systems without harming single threaded
520 config ARCH_CPU_PROBE_RELEASE
522 depends on HOTPLUG_CPU
524 config PPC64_SUPPORTS_MEMORY_FAILURE
525 bool "Add support for memory hwpoison"
526 depends on PPC_BOOK3S_64
527 default "y" if PPC_POWERNV
528 select ARCH_SUPPORTS_MEMORY_FAILURE
531 bool "kexec system call"
532 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
535 kexec is a system call that implements the ability to shutdown your
536 current kernel, and to start another kernel. It is like a reboot
537 but it is independent of the system firmware. And like a reboot
538 you can start any kernel with it, not just Linux.
540 The name comes from the similarity to the exec system call.
542 It is an ongoing process to be certain the hardware in a machine
543 is properly shutdown, so do not be surprised if this code does not
544 initially work for you. As of this writing the exact hardware
545 interface is strongly in flux, so no good recommendation can be
549 bool "kexec file based system call"
551 select HAVE_IMA_KEXEC if IMA
556 depends on CRYPTO_SHA256=y
558 This is a new version of the kexec system call. This call is
559 file based and takes in file descriptors as system call arguments
560 for kernel and initramfs as opposed to a list of segments as is the
561 case for the older kexec call.
563 config ARCH_HAS_KEXEC_PURGATORY
567 bool "Build a relocatable kernel"
568 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
569 select NONSTATIC_KERNEL
570 select MODULE_REL_CRCS if MODVERSIONS
572 This builds a kernel image that is capable of running at the
573 location the kernel is loaded at. For ppc32, there is no any
574 alignment restrictions, and this feature is a superset of
575 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
576 16k-aligned base address. The kernel is linked as a
577 position-independent executable (PIE) and contains dynamic relocations
578 which are processed early in the bootup process.
580 One use is for the kexec on panic case where the recovery kernel
581 must live at a different physical address than the primary
584 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
585 it has been loaded at and the compile time physical addresses
586 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
587 setting can still be useful to bootwrappers that need to know the
588 load address of the kernel (eg. u-boot/mkimage).
590 config RANDOMIZE_BASE
591 bool "Randomize the address of the kernel image"
592 depends on (FSL_BOOKE && FLATMEM && PPC32)
593 depends on RELOCATABLE
595 Randomizes the virtual address at which the kernel image is
596 loaded, as a security feature that deters exploit attempts
597 relying on knowledge of the location of kernel internals.
601 config RELOCATABLE_TEST
602 bool "Test relocatable kernel"
603 depends on (PPC64 && RELOCATABLE)
605 This runs the relocatable kernel at the address it was initially
606 loaded at, which tends to be non-zero and therefore test the
610 bool "Build a dump capture kernel"
611 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
612 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
614 Build a kernel suitable for use as a dump capture kernel.
615 The same kernel binary can be used as production kernel and dump
619 bool "Firmware-assisted dump"
620 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
624 A robust mechanism to get reliable kernel crash dump with
625 assistance from firmware. This approach does not use kexec,
626 instead firmware assists in booting the capture kernel
627 while preserving memory contents. Firmware-assisted dump
628 is meant to be a kdump replacement offering robustness and
629 speed not possible without system firmware assistance.
631 If unsure, say "y". Only special kernels like petitboot may
632 need to say "N" here.
634 config PRESERVE_FA_DUMP
635 bool "Preserve Firmware-assisted dump"
636 depends on PPC64 && PPC_POWERNV && !FA_DUMP
638 On a kernel with FA_DUMP disabled, this option helps to preserve
639 crash data from a previously crash'ed kernel. Useful when the next
640 memory preserving kernel boot would process this crash data.
641 Petitboot kernel is the typical usecase for this option.
644 bool "Export OPAL memory as /sys/firmware/opal/core"
645 depends on PPC64 && PPC_POWERNV
647 This option uses the MPIPL support in firmware to provide an
648 ELF core of OPAL memory after a crash. The ELF core is exported
649 as /sys/firmware/opal/core file which is helpful in debugging
650 OPAL crashes using GDB.
653 bool "Distribute interrupts on all CPUs by default"
656 This option gives the kernel permission to distribute IRQs across
657 multiple CPUs. Saying N here will route all IRQs to the first
658 CPU. Generally saying Y is safe, although some problems have been
659 reported with SMP Power Macintoshes with this option enabled.
662 bool "NUMA Memory Allocation and Scheduler Support"
663 depends on PPC64 && SMP
664 default y if PPC_PSERIES || PPC_POWERNV
666 Enable NUMA (Non-Uniform Memory Access) support.
668 The kernel will try to allocate memory used by a CPU on the
669 local memory controller of the CPU and add some more
670 NUMA awareness to the kernel.
678 config USE_PERCPU_NUMA_NODE_ID
682 config HAVE_MEMORYLESS_NODES
686 config ARCH_SELECT_MEMORY_MODEL
690 config ARCH_FLATMEM_ENABLE
692 depends on (PPC64 && !NUMA) || PPC32
694 config ARCH_SPARSEMEM_ENABLE
697 select SPARSEMEM_VMEMMAP_ENABLE
699 config ARCH_SPARSEMEM_DEFAULT
701 depends on PPC_BOOK3S_64
703 config ILLEGAL_POINTER_VALUE
705 # This is roughly half way between the top of user space and the bottom
706 # of kernel space, which seems about as good as we can get.
707 default 0x5deadbeef0000000 if PPC64
710 config ARCH_MEMORY_PROBE
712 depends on MEMORY_HOTPLUG
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.
765 config PPC_PAGE_SHIFT
767 default 18 if PPC_256K_PAGES
768 default 16 if PPC_64K_PAGES
769 default 14 if PPC_16K_PAGES
773 int "Thread shift" if EXPERT
775 default "15" if PPC_256K_PAGES
776 default "14" if PPC64
777 default "14" if KASAN
780 Used to define the stack size. The default is almost always what you
781 want. Only change this if you know what you are doing.
783 config DATA_SHIFT_BOOL
784 bool "Set custom data alignment"
785 depends on ADVANCED_OPTIONS
786 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
787 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
789 This option allows you to set the kernel data alignment. When
790 RAM is mapped by blocks, the alignment needs to fit the size and
791 number of possible blocks. The default should be OK for most configs.
793 Say N here unless you know what you are doing.
796 int "Data shift" if DATA_SHIFT_BOOL
797 default 24 if STRICT_KERNEL_RWX && PPC64
798 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
799 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
800 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
801 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
802 default 23 if STRICT_KERNEL_RWX && PPC_8xx
803 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
804 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
805 default PPC_PAGE_SHIFT
807 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
808 Smaller is the alignment, greater is the number of necessary DBATs.
810 On 8xx, large pages (512kb or 8M) are used to map kernel linear
811 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
812 in that case. If PIN_TLB is selected, it must be aligned to 8M as
813 8M pages will be pinned.
815 config FORCE_MAX_ZONEORDER
816 int "Maximum zone order"
817 range 8 9 if PPC64 && PPC_64K_PAGES
818 default "9" if PPC64 && PPC_64K_PAGES
819 range 13 13 if PPC64 && !PPC_64K_PAGES
820 default "13" if PPC64 && !PPC_64K_PAGES
821 range 9 64 if PPC32 && PPC_16K_PAGES
822 default "9" if PPC32 && PPC_16K_PAGES
823 range 7 64 if PPC32 && PPC_64K_PAGES
824 default "7" if PPC32 && PPC_64K_PAGES
825 range 5 64 if PPC32 && PPC_256K_PAGES
826 default "5" if PPC32 && PPC_256K_PAGES
830 The kernel memory allocator divides physically contiguous memory
831 blocks into "zones", where each zone is a power of two number of
832 pages. This option selects the largest power of two that the kernel
833 keeps in the memory allocator. If you need to allocate very large
834 blocks of physically contiguous memory, then you may need to
837 This config option is actually maximum order plus one. For example,
838 a value of 11 means that the largest free memory block is 2^10 pages.
840 The page size is not necessarily 4KB. For example, on 64-bit
841 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
842 this in mind when choosing a value for this option.
844 config PPC_SUBPAGE_PROT
845 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
847 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
849 This option adds support for system call to allow user programs
850 to set access permissions (read/write, readonly, or no access)
851 on the 4k subpages of each 64k page.
853 If unsure, say N here.
855 config PPC_PROT_SAO_LPAR
856 bool "Support PROT_SAO mappings in LPARs"
857 depends on PPC_BOOK3S_64
859 This option adds support for PROT_SAO mappings from userspace
860 inside LPARs on supported CPUs.
862 This may cause issues when performing guest migration from
863 a CPU that supports SAO to one that does not.
865 If unsure, say N here.
867 config PPC_COPRO_BASE
871 bool "SMT (Hyperthreading) scheduler support"
872 depends on PPC64 && SMP
874 SMT scheduler support improves the CPU scheduler's decision making
875 when dealing with POWER5 cpus at a cost of slightly increased
876 overhead in some places. If unsure say N here.
878 config PPC_DENORMALISATION
879 bool "PowerPC denormalisation exception handling"
880 depends on PPC_BOOK3S_64
881 default "y" if PPC_POWERNV
883 Add support for handling denormalisation of single precision
884 values. Useful for bare metal only. If unsure say Y here.
887 string "Initial kernel command string"
890 On some platforms, there is currently no way for the boot loader to
891 pass arguments to the kernel. For these platforms, you can supply
892 some command-line options at build time by entering them here. In
893 most cases you will need to specify the root device here.
896 prompt "Kernel command line type" if CMDLINE != ""
897 default CMDLINE_FROM_BOOTLOADER
899 config CMDLINE_FROM_BOOTLOADER
900 bool "Use bootloader kernel arguments if available"
902 Uses the command-line options passed by the boot loader. If
903 the boot loader doesn't provide any, the default kernel command
904 string provided in CMDLINE will be used.
906 config CMDLINE_EXTEND
907 bool "Extend bootloader kernel arguments"
909 The command-line arguments provided by the boot loader will be
910 appended to the default kernel command string.
913 bool "Always use the default kernel command string"
915 Always use the default kernel command string, even if the boot
916 loader passes other arguments to the kernel.
917 This is useful if you cannot or don't want to change the
918 command-line options your boot loader passes to the kernel.
923 string "Additional default image types"
925 List additional targets to be built by the bootwrapper here (separated
926 by spaces). This is useful for targets that depend of device tree
927 files in the .dts directory.
929 Targets in this list will be build as part of the default build
930 target, or when the user does a 'make zImage' or a
931 'make zImage.initrd'.
933 If unsure, leave blank
935 config ARCH_WANTS_FREEZER_CONTROL
939 source "kernel/power/Kconfig"
942 prompt "PowerPC Memory Protection Keys"
944 depends on PPC_BOOK3S_64
945 select ARCH_USES_HIGH_VMA_FLAGS
946 select ARCH_HAS_PKEYS
948 Memory Protection Keys provides a mechanism for enforcing
949 page-based protections, but without requiring modification of the
950 page tables when an application changes protection domains.
952 For details, see Documentation/core-api/protection-keys.rst
956 config PPC_SECURE_BOOT
957 prompt "Enable secure boot support"
959 depends on PPC_POWERNV || PPC_PSERIES
960 depends on IMA_ARCH_POLICY
961 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
963 Systems with firmware secure boot enabled need to define security
964 policies to extend secure boot to the OS. This config allows a user
965 to enable OS secure boot on systems that have firmware support for
966 it. If in doubt say N.
968 config PPC_SECVAR_SYSFS
969 bool "Enable sysfs interface for POWER secure variables"
971 depends on PPC_SECURE_BOOT
974 POWER secure variables are managed and controlled by firmware.
975 These variables are exposed to userspace via sysfs to enable
976 read/write operations on these variables. Say Y if you have
977 secure boot enabled and want to expose variables to userspace.
979 config PPC_RTAS_FILTER
980 bool "Enable filtering of RTAS syscalls"
984 The RTAS syscall API has security issues that could be used to
985 compromise system integrity. This option enforces restrictions on the
986 RTAS calls and arguments passed by userspace programs to mitigate
989 Say Y unless you know what you are doing and the filter is causing
1001 bool "Support for ISA-bus hardware"
1005 Find out whether you have ISA slots on your motherboard. ISA is the
1006 name of a bus system, i.e. the way the CPU talks to the other stuff
1007 inside your box. If you have an Apple machine, say N here; if you
1008 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1009 embedded board, consult your board documentation.
1011 config GENERIC_ISA_DMA
1013 depends on ISA_DMA_API
1016 config PPC_INDIRECT_PCI
1019 default y if 40x || 44x
1029 select ARCH_HAS_DMA_SET_MASK
1030 select PPC_INDIRECT_PCI
1036 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1038 Freescale MPC85xx/MPC86xx power management controller support
1039 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1044 depends on SUSPEND && (44x || 40x)
1046 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1047 It also enables support for two different idle states (idle-wait
1054 bool "Freescale Local Bus support"
1056 Enables reporting of errors from the Freescale local bus
1057 controller. Also contains some common code used by
1058 drivers for specific local bus peripherals.
1062 depends on PPC_83xx || QUICC_ENGINE || CPM2
1064 Freescale General-purpose Timers support
1068 depends on PCI && 8260
1069 select PPC_INDIRECT_PCI
1073 bool "Freescale Embedded SRIO Controller support"
1074 depends on RAPIDIO = y && HAVE_RAPIDIO
1077 Include support for RapidIO controller on Freescale embedded
1078 processors (MPC8548, MPC8641, etc).
1082 config NONSTATIC_KERNEL
1085 menu "Advanced setup"
1088 config ADVANCED_OPTIONS
1089 bool "Prompt for advanced kernel configuration options"
1091 This option will enable prompting for a variety of advanced kernel
1092 configuration options. These options can cause the kernel to not
1093 work if they are set incorrectly, but can be used to optimize certain
1094 aspects of kernel memory management.
1096 Unless you know what you are doing, say N here.
1098 comment "Default settings for advanced configuration options are used"
1099 depends on !ADVANCED_OPTIONS
1101 config LOWMEM_SIZE_BOOL
1102 bool "Set maximum low memory"
1103 depends on ADVANCED_OPTIONS
1105 This option allows you to set the maximum amount of memory which
1106 will be used as "low memory", that is, memory which the kernel can
1107 access directly, without having to set up a kernel virtual mapping.
1108 This can be useful in optimizing the layout of kernel virtual
1111 Say N here unless you know what you are doing.
1114 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1115 default "0x30000000"
1117 config LOWMEM_CAM_NUM_BOOL
1118 bool "Set number of CAMs to use to map low memory"
1119 depends on ADVANCED_OPTIONS && FSL_BOOKE
1121 This option allows you to set the maximum number of CAM slots that
1122 will be used to map low memory. There are a limited number of slots
1123 available and even more limited number that will fit in the L1 MMU.
1124 However, using more entries will allow mapping more low memory. This
1125 can be useful in optimizing the layout of kernel virtual memory.
1127 Say N here unless you know what you are doing.
1129 config LOWMEM_CAM_NUM
1130 depends on FSL_BOOKE
1131 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1134 config DYNAMIC_MEMSTART
1135 bool "Enable page aligned dynamic load address for kernel"
1136 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1137 select NONSTATIC_KERNEL
1139 This option enables the kernel to be loaded at any page aligned
1140 physical address. The kernel creates a mapping from KERNELBASE to
1141 the address where the kernel is loaded. The page size here implies
1142 the TLB page size of the mapping for kernel on the particular platform.
1143 Please refer to the init code for finding the TLB page size.
1145 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1146 kernel image, where the only restriction is the page aligned kernel
1147 load address. When this option is enabled, the compile time physical
1148 address CONFIG_PHYSICAL_START is ignored.
1150 This option is overridden by CONFIG_RELOCATABLE
1152 config PAGE_OFFSET_BOOL
1153 bool "Set custom page offset address"
1154 depends on ADVANCED_OPTIONS
1156 This option allows you to set the kernel virtual address at which
1157 the kernel will map low memory. This can be useful in optimizing
1158 the virtual memory layout of the system.
1160 Say N here unless you know what you are doing.
1163 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1164 default "0xc0000000"
1166 config KERNEL_START_BOOL
1167 bool "Set custom kernel base address"
1168 depends on ADVANCED_OPTIONS
1170 This option allows you to set the kernel virtual address at which
1171 the kernel will be loaded. Normally this should match PAGE_OFFSET
1172 however there are times (like kdump) that one might not want them
1175 Say N here unless you know what you are doing.
1178 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1179 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1180 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1181 default "0xc0000000"
1183 config PHYSICAL_START_BOOL
1184 bool "Set physical address where the kernel is loaded"
1185 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1187 This gives the physical address where the kernel is loaded.
1189 Say N here unless you know what you are doing.
1191 config PHYSICAL_START
1192 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1193 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1194 default "0x00000000"
1196 config PHYSICAL_ALIGN
1198 default "0x04000000" if FSL_BOOKE
1200 This value puts the alignment restrictions on physical address
1201 where kernel is loaded and run from. Kernel is compiled for an
1202 address which meets above alignment restriction.
1204 config TASK_SIZE_BOOL
1205 bool "Set custom user task size"
1206 depends on ADVANCED_OPTIONS
1208 This option allows you to set the amount of virtual address space
1209 allocated to user tasks. This can be useful in optimizing the
1210 virtual memory layout of the system.
1212 Say N here unless you know what you are doing.
1215 hex "Size of user task space" if TASK_SIZE_BOOL
1216 default "0x80000000" if PPC_8xx
1217 default "0xb0000000" if PPC_BOOK3S_32
1218 default "0xc0000000"
1222 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1225 default "0xc000000000000000"
1228 default "0xc000000000000000"
1229 config PHYSICAL_START
1231 default "0x00000000"
1237 config PPC_LIB_RHEAP
1240 source "arch/powerpc/kvm/Kconfig"
1242 source "kernel/livepatch/Kconfig"