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_DEVMEM_IS_ALLOWED
127 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
128 select ARCH_HAS_ELF_RANDOMIZE
129 select ARCH_HAS_FORTIFY_SOURCE
130 select ARCH_HAS_GCOV_PROFILE_ALL
131 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
133 select ARCH_HAS_MEMBARRIER_CALLBACKS
134 select ARCH_HAS_MEMBARRIER_SYNC_CORE
135 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
136 select ARCH_HAS_MMIOWB if PPC64
137 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
138 select ARCH_HAS_PHYS_TO_DMA
139 select ARCH_HAS_PMEM_API
140 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
141 select ARCH_HAS_PTE_SPECIAL
142 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
143 select ARCH_HAS_SET_MEMORY
144 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION)
145 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX && !PPC_BOOK3S_32
146 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
147 select ARCH_HAS_UACCESS_FLUSHCACHE
148 select ARCH_HAS_UBSAN_SANITIZE_ALL
149 select ARCH_HAVE_NMI_SAFE_CMPXCHG
150 select ARCH_KEEP_MEMBLOCK
151 select ARCH_MIGHT_HAVE_PC_PARPORT
152 select ARCH_MIGHT_HAVE_PC_SERIO
153 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
154 select ARCH_STACKWALK
155 select ARCH_SUPPORTS_ATOMIC_RMW
156 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
157 select ARCH_USE_BUILTIN_BSWAP
158 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
159 select ARCH_USE_MEMTEST
160 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
161 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
162 select ARCH_WANT_IPC_PARSE_VERSION
163 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
164 select ARCH_WANT_LD_ORPHAN_WARN
165 select ARCH_WEAK_RELEASE_ACQUIRE
167 select BUILDTIME_TABLE_SORT
168 select CLONE_BACKWARDS
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_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_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
195 select HAVE_ARCH_KFENCE if PPC32
196 select HAVE_ARCH_KGDB
197 select HAVE_ARCH_MMAP_RND_BITS
198 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
199 select HAVE_ARCH_NVRAM_OPS
200 select HAVE_ARCH_SECCOMP_FILTER
201 select HAVE_ARCH_TRACEHOOK
202 select HAVE_ASM_MODVERSIONS
203 select HAVE_CONTEXT_TRACKING if PPC64
204 select HAVE_C_RECORDMCOUNT
205 select HAVE_DEBUG_KMEMLEAK
206 select HAVE_DEBUG_STACKOVERFLOW
207 select HAVE_DYNAMIC_FTRACE
208 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
210 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
212 select HAVE_FTRACE_MCOUNT_RECORD
213 select HAVE_FUNCTION_ERROR_INJECTION
214 select HAVE_FUNCTION_GRAPH_TRACER
215 select HAVE_FUNCTION_TRACER
216 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
217 select HAVE_GENERIC_VDSO
218 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
219 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
220 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
222 select HAVE_IOREMAP_PROT
223 select HAVE_IRQ_EXIT_ON_IRQ_STACK
224 select HAVE_IRQ_TIME_ACCOUNTING
225 select HAVE_KERNEL_GZIP
226 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
227 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
228 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
230 select HAVE_KPROBES_ON_FTRACE
231 select HAVE_KRETPROBES
232 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
233 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
234 select HAVE_MOD_ARCH_SPECIFIC
235 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
236 select HAVE_OPTPROBES
237 select HAVE_PERF_EVENTS
238 select HAVE_PERF_EVENTS_NMI if PPC64
239 select HAVE_PERF_REGS
240 select HAVE_PERF_USER_STACK_DUMP
241 select HAVE_REGS_AND_STACK_ACCESS_API
242 select HAVE_RELIABLE_STACKTRACE
244 select HAVE_SOFTIRQ_ON_OWN_STACK
245 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
246 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
247 select HAVE_SYSCALL_TRACEPOINTS
248 select HAVE_VIRT_CPU_ACCOUNTING
249 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
250 select IOMMU_HELPER if PPC64
252 select IRQ_FORCED_THREADING
253 select MMU_GATHER_PAGE_SIZE
254 select MMU_GATHER_RCU_TABLE_FREE
255 select MODULES_USE_ELF_RELA
256 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
257 select NEED_SG_DMA_LENGTH
259 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
260 select OF_EARLY_FLATTREE
261 select OLD_SIGACTION if PPC32
262 select OLD_SIGSUSPEND
263 select PCI_DOMAINS if PCI
264 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
265 select PCI_SYSCALL if PCI
266 select PPC_DAWR if PPC64
269 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
270 select SYSCTL_EXCEPTION_TRACE
271 select THREAD_INFO_IN_TASK
272 select VIRT_TO_BUS if !PPC64
274 # Please keep this list sorted alphabetically.
277 config PPC_BARRIER_NOSPEC
280 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
291 bool "Enable support for 32bit binaries"
293 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
294 default y if !CPU_LITTLE_ENDIAN
295 select ARCH_WANT_OLD_COMPAT_IPC
296 select COMPAT_OLD_SIGACTION
298 config SYSVIPC_COMPAT
300 depends on COMPAT && SYSVIPC
303 config SCHED_OMIT_FRAME_POINTER
307 config ARCH_MAY_HAVE_PC_FDC
311 config PPC_UDBG_16550
314 config GENERIC_TBSYNC
316 default y if PPC32 && SMP
327 config GENERIC_BUG_RELATIVE_POINTERS
329 depends on GENERIC_BUG
331 config SYS_SUPPORTS_APM_EMULATION
332 default y if PMAC_APM_EMU
338 Used to allow a board to specify it wants an ePAPR compliant wrapper.
340 config DEFAULT_UIMAGE
343 Used to allow a board to specify it wants a uImage built by default
345 config ARCH_HIBERNATION_POSSIBLE
349 config ARCH_SUSPEND_POSSIBLE
351 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
352 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
355 config ARCH_SUSPEND_NONZERO_CPU
357 depends on PPC_POWERNV || PPC_PSERIES
359 config PPC_DCR_NATIVE
367 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
370 config PPC_OF_PLATFORM_PCI
373 depends on PPC64 # not supported on 32 bits yet
375 config ARCH_SUPPORTS_UPROBES
378 config PPC_ADV_DEBUG_REGS
380 depends on 40x || BOOKE
383 config PPC_ADV_DEBUG_IACS
385 depends on PPC_ADV_DEBUG_REGS
389 config PPC_ADV_DEBUG_DACS
391 depends on PPC_ADV_DEBUG_REGS
394 config PPC_ADV_DEBUG_DVCS
396 depends on PPC_ADV_DEBUG_REGS
400 config PPC_ADV_DEBUG_DAC_RANGE
402 depends on PPC_ADV_DEBUG_REGS && 44x
408 config PGTABLE_LEVELS
413 source "arch/powerpc/sysdev/Kconfig"
414 source "arch/powerpc/platforms/Kconfig"
416 menu "Kernel options"
419 bool "High memory support"
423 source "kernel/Kconfig.hz"
425 config MATH_EMULATION
426 bool "Math emulation"
427 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
430 Some PowerPC chips designed for embedded applications do not have
431 a floating-point unit and therefore do not implement the
432 floating-point instructions in the PowerPC instruction set. If you
433 say Y here, the kernel will include code to emulate a floating-point
434 unit, which will allow programs that use floating-point
437 This is also useful to emulate missing (optional) instructions
438 such as fsqrt on cores that do have an FPU but do not implement
439 them (such as Freescale BookE).
442 prompt "Math emulation options"
443 default MATH_EMULATION_FULL
444 depends on MATH_EMULATION
446 config MATH_EMULATION_FULL
447 bool "Emulate all the floating point instructions"
449 Select this option will enable the kernel to support to emulate
450 all the floating point instructions. If your SoC doesn't have
451 a FPU, you should select this.
453 config MATH_EMULATION_HW_UNIMPLEMENTED
454 bool "Just emulate the FPU unimplemented instructions"
456 Select this if you know there does have a hardware FPU on your
457 SoC, but some floating point instructions are not implemented by that.
461 config PPC_TRANSACTIONAL_MEM
462 bool "Transactional Memory support for POWERPC"
463 depends on PPC_BOOK3S_64
468 Support user-mode Transactional Memory on POWERPC.
471 bool "Ultravisor support"
472 depends on KVM_BOOK3S_HV_POSSIBLE
473 depends on DEVICE_PRIVATE
476 This option paravirtualizes the kernel to run in POWER platforms that
477 supports the Protected Execution Facility (PEF). On such platforms,
478 the ultravisor firmware runs at a privilege level above the
483 config LD_HEAD_STUB_CATCH
484 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
487 Very large kernels can cause linker branch stubs to be generated by
488 code in head_64.S, which moves the head text sections out of their
489 specified location. This option can work around the problem.
493 config MPROFILE_KERNEL
494 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
495 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
498 bool "Support for enabling/disabling CPUs"
499 depends on SMP && (PPC_PSERIES || \
500 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
502 Say Y here to be able to disable and re-enable individual
503 CPUs at runtime on SMP machines.
505 Say N if you are unsure.
507 config PPC_QUEUED_SPINLOCKS
508 bool "Queued spinlocks" if EXPERT
510 default PPC_BOOK3S_64
512 Say Y here to use queued spinlocks which give better scalability and
513 fairness on large SMP and NUMA systems without harming single threaded
516 config ARCH_CPU_PROBE_RELEASE
518 depends on HOTPLUG_CPU
520 config PPC64_SUPPORTS_MEMORY_FAILURE
521 bool "Add support for memory hwpoison"
522 depends on PPC_BOOK3S_64
523 default "y" if PPC_POWERNV
524 select ARCH_SUPPORTS_MEMORY_FAILURE
527 bool "kexec system call"
528 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
531 kexec is a system call that implements the ability to shutdown your
532 current kernel, and to start another kernel. It is like a reboot
533 but it is independent of the system firmware. And like a reboot
534 you can start any kernel with it, not just Linux.
536 The name comes from the similarity to the exec system call.
538 It is an ongoing process to be certain the hardware in a machine
539 is properly shutdown, so do not be surprised if this code does not
540 initially work for you. As of this writing the exact hardware
541 interface is strongly in flux, so no good recommendation can be
545 bool "kexec file based system call"
547 select HAVE_IMA_KEXEC if IMA
552 depends on CRYPTO_SHA256=y
554 This is a new version of the kexec system call. This call is
555 file based and takes in file descriptors as system call arguments
556 for kernel and initramfs as opposed to a list of segments as is the
557 case for the older kexec call.
559 config ARCH_HAS_KEXEC_PURGATORY
563 bool "Build a relocatable kernel"
564 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
565 select NONSTATIC_KERNEL
566 select MODULE_REL_CRCS if MODVERSIONS
568 This builds a kernel image that is capable of running at the
569 location the kernel is loaded at. For ppc32, there is no any
570 alignment restrictions, and this feature is a superset of
571 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
572 16k-aligned base address. The kernel is linked as a
573 position-independent executable (PIE) and contains dynamic relocations
574 which are processed early in the bootup process.
576 One use is for the kexec on panic case where the recovery kernel
577 must live at a different physical address than the primary
580 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
581 it has been loaded at and the compile time physical addresses
582 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
583 setting can still be useful to bootwrappers that need to know the
584 load address of the kernel (eg. u-boot/mkimage).
586 config RANDOMIZE_BASE
587 bool "Randomize the address of the kernel image"
588 depends on (FSL_BOOKE && FLATMEM && PPC32)
589 depends on RELOCATABLE
591 Randomizes the virtual address at which the kernel image is
592 loaded, as a security feature that deters exploit attempts
593 relying on knowledge of the location of kernel internals.
597 config RELOCATABLE_TEST
598 bool "Test relocatable kernel"
599 depends on (PPC64 && RELOCATABLE)
601 This runs the relocatable kernel at the address it was initially
602 loaded at, which tends to be non-zero and therefore test the
606 bool "Build a dump capture kernel"
607 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
608 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
610 Build a kernel suitable for use as a dump capture kernel.
611 The same kernel binary can be used as production kernel and dump
615 bool "Firmware-assisted dump"
616 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
620 A robust mechanism to get reliable kernel crash dump with
621 assistance from firmware. This approach does not use kexec,
622 instead firmware assists in booting the capture kernel
623 while preserving memory contents. Firmware-assisted dump
624 is meant to be a kdump replacement offering robustness and
625 speed not possible without system firmware assistance.
627 If unsure, say "y". Only special kernels like petitboot may
628 need to say "N" here.
630 config PRESERVE_FA_DUMP
631 bool "Preserve Firmware-assisted dump"
632 depends on PPC64 && PPC_POWERNV && !FA_DUMP
634 On a kernel with FA_DUMP disabled, this option helps to preserve
635 crash data from a previously crash'ed kernel. Useful when the next
636 memory preserving kernel boot would process this crash data.
637 Petitboot kernel is the typical usecase for this option.
640 bool "Export OPAL memory as /sys/firmware/opal/core"
641 depends on PPC64 && PPC_POWERNV
643 This option uses the MPIPL support in firmware to provide an
644 ELF core of OPAL memory after a crash. The ELF core is exported
645 as /sys/firmware/opal/core file which is helpful in debugging
646 OPAL crashes using GDB.
649 bool "Distribute interrupts on all CPUs by default"
652 This option gives the kernel permission to distribute IRQs across
653 multiple CPUs. Saying N here will route all IRQs to the first
654 CPU. Generally saying Y is safe, although some problems have been
655 reported with SMP Power Macintoshes with this option enabled.
658 bool "NUMA Memory Allocation and Scheduler Support"
659 depends on PPC64 && SMP
660 default y if PPC_PSERIES || PPC_POWERNV
662 Enable NUMA (Non-Uniform Memory Access) support.
664 The kernel will try to allocate memory used by a CPU on the
665 local memory controller of the CPU and add some more
666 NUMA awareness to the kernel.
674 config USE_PERCPU_NUMA_NODE_ID
678 config HAVE_MEMORYLESS_NODES
682 config ARCH_SELECT_MEMORY_MODEL
686 config ARCH_FLATMEM_ENABLE
688 depends on (PPC64 && !NUMA) || PPC32
690 config ARCH_SPARSEMEM_ENABLE
693 select SPARSEMEM_VMEMMAP_ENABLE
695 config ARCH_SPARSEMEM_DEFAULT
697 depends on PPC_BOOK3S_64
699 config ILLEGAL_POINTER_VALUE
701 # This is roughly half way between the top of user space and the bottom
702 # of kernel space, which seems about as good as we can get.
703 default 0x5deadbeef0000000 if PPC64
706 config ARCH_MEMORY_PROBE
708 depends on MEMORY_HOTPLUG
714 Select the kernel logical page size. Increasing the page size
715 will reduce software overhead at each page boundary, allow
716 hardware prefetch mechanisms to be more effective, and allow
717 larger dma transfers increasing IO efficiency and reducing
718 overhead. However the utilization of memory will increase.
719 For example, each cached file will using a multiple of the
720 page size to hold its contents and the difference between the
721 end of file and the end of page is wasted.
723 Some dedicated systems, such as software raid serving with
724 accelerated calculations, have shown significant increases.
726 If you configure a 64 bit kernel for 64k pages but the
727 processor does not support them, then the kernel will simulate
728 them with 4k pages, loading them on demand, but with the
729 reduced software overhead and larger internal fragmentation.
730 For the 32 bit kernel, a large page option will not be offered
731 unless it is supported by the configured processor.
733 If unsure, choose 4K_PAGES.
737 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
741 depends on 44x || PPC_8xx
745 depends on 44x || PPC_BOOK3S_64
746 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
748 config PPC_256K_PAGES
749 bool "256k page size (Requires non-standard binutils settings)"
750 depends on 44x && !PPC_47x
752 Make the page size 256k.
754 The kernel will only be able to run applications that have been
755 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
756 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
757 definition from 0x10000 to 0x40000 in older versions.
761 config PPC_PAGE_SHIFT
763 default 18 if PPC_256K_PAGES
764 default 16 if PPC_64K_PAGES
765 default 14 if PPC_16K_PAGES
769 int "Thread shift" if EXPERT
771 default "15" if PPC_256K_PAGES
772 default "14" if PPC64
773 default "14" if KASAN
776 Used to define the stack size. The default is almost always what you
777 want. Only change this if you know what you are doing.
779 config DATA_SHIFT_BOOL
780 bool "Set custom data alignment"
781 depends on ADVANCED_OPTIONS
782 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
783 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
785 This option allows you to set the kernel data alignment. When
786 RAM is mapped by blocks, the alignment needs to fit the size and
787 number of possible blocks. The default should be OK for most configs.
789 Say N here unless you know what you are doing.
792 int "Data shift" if DATA_SHIFT_BOOL
793 default 24 if STRICT_KERNEL_RWX && PPC64
794 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
795 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
796 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
797 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
798 default 23 if STRICT_KERNEL_RWX && PPC_8xx
799 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
800 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
801 default PPC_PAGE_SHIFT
803 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
804 Smaller is the alignment, greater is the number of necessary DBATs.
806 On 8xx, large pages (512kb or 8M) are used to map kernel linear
807 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
808 in that case. If PIN_TLB is selected, it must be aligned to 8M as
809 8M pages will be pinned.
811 config FORCE_MAX_ZONEORDER
812 int "Maximum zone order"
813 range 8 9 if PPC64 && PPC_64K_PAGES
814 default "9" if PPC64 && PPC_64K_PAGES
815 range 13 13 if PPC64 && !PPC_64K_PAGES
816 default "13" if PPC64 && !PPC_64K_PAGES
817 range 9 64 if PPC32 && PPC_16K_PAGES
818 default "9" if PPC32 && PPC_16K_PAGES
819 range 7 64 if PPC32 && PPC_64K_PAGES
820 default "7" if PPC32 && PPC_64K_PAGES
821 range 5 64 if PPC32 && PPC_256K_PAGES
822 default "5" if PPC32 && PPC_256K_PAGES
826 The kernel memory allocator divides physically contiguous memory
827 blocks into "zones", where each zone is a power of two number of
828 pages. This option selects the largest power of two that the kernel
829 keeps in the memory allocator. If you need to allocate very large
830 blocks of physically contiguous memory, then you may need to
833 This config option is actually maximum order plus one. For example,
834 a value of 11 means that the largest free memory block is 2^10 pages.
836 The page size is not necessarily 4KB. For example, on 64-bit
837 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
838 this in mind when choosing a value for this option.
840 config PPC_SUBPAGE_PROT
841 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
843 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
845 This option adds support for system call to allow user programs
846 to set access permissions (read/write, readonly, or no access)
847 on the 4k subpages of each 64k page.
849 If unsure, say N here.
851 config PPC_PROT_SAO_LPAR
852 bool "Support PROT_SAO mappings in LPARs"
853 depends on PPC_BOOK3S_64
855 This option adds support for PROT_SAO mappings from userspace
856 inside LPARs on supported CPUs.
858 This may cause issues when performing guest migration from
859 a CPU that supports SAO to one that does not.
861 If unsure, say N here.
863 config PPC_COPRO_BASE
867 bool "SMT (Hyperthreading) scheduler support"
868 depends on PPC64 && SMP
870 SMT scheduler support improves the CPU scheduler's decision making
871 when dealing with POWER5 cpus at a cost of slightly increased
872 overhead in some places. If unsure say N here.
874 config PPC_DENORMALISATION
875 bool "PowerPC denormalisation exception handling"
876 depends on PPC_BOOK3S_64
877 default "y" if PPC_POWERNV
879 Add support for handling denormalisation of single precision
880 values. Useful for bare metal only. If unsure say Y here.
883 string "Initial kernel command string"
886 On some platforms, there is currently no way for the boot loader to
887 pass arguments to the kernel. For these platforms, you can supply
888 some command-line options at build time by entering them here. In
889 most cases you will need to specify the root device here.
892 prompt "Kernel command line type" if CMDLINE != ""
893 default CMDLINE_FROM_BOOTLOADER
895 config CMDLINE_FROM_BOOTLOADER
896 bool "Use bootloader kernel arguments if available"
898 Uses the command-line options passed by the boot loader. If
899 the boot loader doesn't provide any, the default kernel command
900 string provided in CMDLINE will be used.
902 config CMDLINE_EXTEND
903 bool "Extend bootloader kernel arguments"
905 The command-line arguments provided by the boot loader will be
906 appended to the default kernel command string.
909 bool "Always use the default kernel command string"
911 Always use the default kernel command string, even if the boot
912 loader passes other arguments to the kernel.
913 This is useful if you cannot or don't want to change the
914 command-line options your boot loader passes to the kernel.
919 string "Additional default image types"
921 List additional targets to be built by the bootwrapper here (separated
922 by spaces). This is useful for targets that depend of device tree
923 files in the .dts directory.
925 Targets in this list will be build as part of the default build
926 target, or when the user does a 'make zImage' or a
927 'make zImage.initrd'.
929 If unsure, leave blank
931 config ARCH_WANTS_FREEZER_CONTROL
935 source "kernel/power/Kconfig"
938 prompt "PowerPC Memory Protection Keys"
940 depends on PPC_BOOK3S_64
941 select ARCH_USES_HIGH_VMA_FLAGS
942 select ARCH_HAS_PKEYS
944 Memory Protection Keys provides a mechanism for enforcing
945 page-based protections, but without requiring modification of the
946 page tables when an application changes protection domains.
948 For details, see Documentation/core-api/protection-keys.rst
952 config PPC_SECURE_BOOT
953 prompt "Enable secure boot support"
955 depends on PPC_POWERNV || PPC_PSERIES
956 depends on IMA_ARCH_POLICY
957 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
959 Systems with firmware secure boot enabled need to define security
960 policies to extend secure boot to the OS. This config allows a user
961 to enable OS secure boot on systems that have firmware support for
962 it. If in doubt say N.
964 config PPC_SECVAR_SYSFS
965 bool "Enable sysfs interface for POWER secure variables"
967 depends on PPC_SECURE_BOOT
970 POWER secure variables are managed and controlled by firmware.
971 These variables are exposed to userspace via sysfs to enable
972 read/write operations on these variables. Say Y if you have
973 secure boot enabled and want to expose variables to userspace.
975 config PPC_RTAS_FILTER
976 bool "Enable filtering of RTAS syscalls"
980 The RTAS syscall API has security issues that could be used to
981 compromise system integrity. This option enforces restrictions on the
982 RTAS calls and arguments passed by userspace programs to mitigate
985 Say Y unless you know what you are doing and the filter is causing
997 bool "Support for ISA-bus hardware"
1001 Find out whether you have ISA slots on your motherboard. ISA is the
1002 name of a bus system, i.e. the way the CPU talks to the other stuff
1003 inside your box. If you have an Apple machine, say N here; if you
1004 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1005 embedded board, consult your board documentation.
1007 config GENERIC_ISA_DMA
1009 depends on ISA_DMA_API
1012 config PPC_INDIRECT_PCI
1015 default y if 40x || 44x
1025 select ARCH_HAS_DMA_SET_MASK
1026 select PPC_INDIRECT_PCI
1032 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1034 Freescale MPC85xx/MPC86xx power management controller support
1035 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1040 depends on SUSPEND && (44x || 40x)
1042 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1043 It also enables support for two different idle states (idle-wait
1050 bool "Freescale Local Bus support"
1052 Enables reporting of errors from the Freescale local bus
1053 controller. Also contains some common code used by
1054 drivers for specific local bus peripherals.
1058 depends on PPC_83xx || QUICC_ENGINE || CPM2
1060 Freescale General-purpose Timers support
1064 depends on PCI && 8260
1065 select PPC_INDIRECT_PCI
1069 bool "Freescale Embedded SRIO Controller support"
1070 depends on RAPIDIO = y && HAVE_RAPIDIO
1073 Include support for RapidIO controller on Freescale embedded
1074 processors (MPC8548, MPC8641, etc).
1078 config NONSTATIC_KERNEL
1081 menu "Advanced setup"
1084 config ADVANCED_OPTIONS
1085 bool "Prompt for advanced kernel configuration options"
1087 This option will enable prompting for a variety of advanced kernel
1088 configuration options. These options can cause the kernel to not
1089 work if they are set incorrectly, but can be used to optimize certain
1090 aspects of kernel memory management.
1092 Unless you know what you are doing, say N here.
1094 comment "Default settings for advanced configuration options are used"
1095 depends on !ADVANCED_OPTIONS
1097 config LOWMEM_SIZE_BOOL
1098 bool "Set maximum low memory"
1099 depends on ADVANCED_OPTIONS
1101 This option allows you to set the maximum amount of memory which
1102 will be used as "low memory", that is, memory which the kernel can
1103 access directly, without having to set up a kernel virtual mapping.
1104 This can be useful in optimizing the layout of kernel virtual
1107 Say N here unless you know what you are doing.
1110 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1111 default "0x30000000"
1113 config LOWMEM_CAM_NUM_BOOL
1114 bool "Set number of CAMs to use to map low memory"
1115 depends on ADVANCED_OPTIONS && FSL_BOOKE
1117 This option allows you to set the maximum number of CAM slots that
1118 will be used to map low memory. There are a limited number of slots
1119 available and even more limited number that will fit in the L1 MMU.
1120 However, using more entries will allow mapping more low memory. This
1121 can be useful in optimizing the layout of kernel virtual memory.
1123 Say N here unless you know what you are doing.
1125 config LOWMEM_CAM_NUM
1126 depends on FSL_BOOKE
1127 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1130 config DYNAMIC_MEMSTART
1131 bool "Enable page aligned dynamic load address for kernel"
1132 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1133 select NONSTATIC_KERNEL
1135 This option enables the kernel to be loaded at any page aligned
1136 physical address. The kernel creates a mapping from KERNELBASE to
1137 the address where the kernel is loaded. The page size here implies
1138 the TLB page size of the mapping for kernel on the particular platform.
1139 Please refer to the init code for finding the TLB page size.
1141 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1142 kernel image, where the only restriction is the page aligned kernel
1143 load address. When this option is enabled, the compile time physical
1144 address CONFIG_PHYSICAL_START is ignored.
1146 This option is overridden by CONFIG_RELOCATABLE
1148 config PAGE_OFFSET_BOOL
1149 bool "Set custom page offset address"
1150 depends on ADVANCED_OPTIONS
1152 This option allows you to set the kernel virtual address at which
1153 the kernel will map low memory. This can be useful in optimizing
1154 the virtual memory layout of the system.
1156 Say N here unless you know what you are doing.
1159 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1160 default "0xc0000000"
1162 config KERNEL_START_BOOL
1163 bool "Set custom kernel base address"
1164 depends on ADVANCED_OPTIONS
1166 This option allows you to set the kernel virtual address at which
1167 the kernel will be loaded. Normally this should match PAGE_OFFSET
1168 however there are times (like kdump) that one might not want them
1171 Say N here unless you know what you are doing.
1174 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1175 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1176 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1177 default "0xc0000000"
1179 config PHYSICAL_START_BOOL
1180 bool "Set physical address where the kernel is loaded"
1181 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1183 This gives the physical address where the kernel is loaded.
1185 Say N here unless you know what you are doing.
1187 config PHYSICAL_START
1188 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1189 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1190 default "0x00000000"
1192 config PHYSICAL_ALIGN
1194 default "0x04000000" if FSL_BOOKE
1196 This value puts the alignment restrictions on physical address
1197 where kernel is loaded and run from. Kernel is compiled for an
1198 address which meets above alignment restriction.
1200 config TASK_SIZE_BOOL
1201 bool "Set custom user task size"
1202 depends on ADVANCED_OPTIONS
1204 This option allows you to set the amount of virtual address space
1205 allocated to user tasks. This can be useful in optimizing the
1206 virtual memory layout of the system.
1208 Say N here unless you know what you are doing.
1211 hex "Size of user task space" if TASK_SIZE_BOOL
1212 default "0x80000000" if PPC_8xx
1213 default "0xb0000000" if PPC_BOOK3S_32
1214 default "0xc0000000"
1218 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1221 default "0xc000000000000000"
1224 default "0xc000000000000000"
1225 config PHYSICAL_START
1227 default "0x00000000"
1233 config PPC_LIB_RHEAP
1236 source "arch/powerpc/kvm/Kconfig"
1238 source "kernel/livepatch/Kconfig"