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 if PPC_BOOK3E_64
197 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
198 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
199 select HAVE_ARCH_KGDB
200 select HAVE_ARCH_MMAP_RND_BITS
201 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
202 select HAVE_ARCH_NVRAM_OPS
203 select HAVE_ARCH_SECCOMP_FILTER
204 select HAVE_ARCH_TRACEHOOK
205 select HAVE_ASM_MODVERSIONS
206 select HAVE_CONTEXT_TRACKING if PPC64
207 select HAVE_C_RECORDMCOUNT
208 select HAVE_DEBUG_KMEMLEAK
209 select HAVE_DEBUG_STACKOVERFLOW
210 select HAVE_DYNAMIC_FTRACE
211 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
212 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
214 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
216 select HAVE_FTRACE_MCOUNT_RECORD
217 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
218 select HAVE_FUNCTION_ERROR_INJECTION
219 select HAVE_FUNCTION_GRAPH_TRACER
220 select HAVE_FUNCTION_TRACER
221 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
222 select HAVE_GENERIC_VDSO
223 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
224 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
225 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
226 select HAVE_IOREMAP_PROT
227 select HAVE_IRQ_TIME_ACCOUNTING
228 select HAVE_KERNEL_GZIP
229 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
230 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
231 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
233 select HAVE_KPROBES_ON_FTRACE
234 select HAVE_KRETPROBES
235 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
236 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
237 select HAVE_MOD_ARCH_SPECIFIC
238 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
239 select HAVE_OPTPROBES
240 select HAVE_PERF_EVENTS
241 select HAVE_PERF_EVENTS_NMI if PPC64
242 select HAVE_PERF_REGS
243 select HAVE_PERF_USER_STACK_DUMP
244 select HAVE_REGS_AND_STACK_ACCESS_API
245 select HAVE_RELIABLE_STACKTRACE
247 select HAVE_SETUP_PER_CPU_AREA if PPC64
248 select HAVE_SOFTIRQ_ON_OWN_STACK
249 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
250 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
251 select HAVE_STATIC_CALL if PPC32
252 select HAVE_SYSCALL_TRACEPOINTS
253 select HAVE_VIRT_CPU_ACCOUNTING
254 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
255 select IOMMU_HELPER if PPC64
257 select IRQ_FORCED_THREADING
258 select KASAN_VMALLOC if KASAN && MODULES
259 select MMU_GATHER_PAGE_SIZE
260 select MMU_GATHER_RCU_TABLE_FREE
261 select MODULES_USE_ELF_RELA
262 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
263 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
264 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
265 select NEED_SG_DMA_LENGTH
267 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
268 select OF_EARLY_FLATTREE
269 select OLD_SIGACTION if PPC32
270 select OLD_SIGSUSPEND
271 select PCI_DOMAINS if PCI
272 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
273 select PCI_SYSCALL if PCI
274 select PPC_DAWR if PPC64
277 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
278 select SYSCTL_EXCEPTION_TRACE
279 select THREAD_INFO_IN_TASK
280 select TRACE_IRQFLAGS_SUPPORT
281 select VIRT_TO_BUS if !PPC64
283 # Please keep this list sorted alphabetically.
286 config PPC_BARRIER_NOSPEC
289 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
300 bool "Enable support for 32bit binaries"
302 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
303 default y if !CPU_LITTLE_ENDIAN
304 select ARCH_WANT_OLD_COMPAT_IPC
305 select COMPAT_OLD_SIGACTION
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 ARCH_HAS_ADD_PAGES
365 depends on ARCH_ENABLE_MEMORY_HOTPLUG
367 config PPC_DCR_NATIVE
375 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
378 config PPC_OF_PLATFORM_PCI
381 depends on PPC64 # not supported on 32 bits yet
383 config ARCH_SUPPORTS_UPROBES
386 config PPC_ADV_DEBUG_REGS
388 depends on 40x || BOOKE
391 config PPC_ADV_DEBUG_IACS
393 depends on PPC_ADV_DEBUG_REGS
397 config PPC_ADV_DEBUG_DACS
399 depends on PPC_ADV_DEBUG_REGS
402 config PPC_ADV_DEBUG_DVCS
404 depends on PPC_ADV_DEBUG_REGS
408 config PPC_ADV_DEBUG_DAC_RANGE
410 depends on PPC_ADV_DEBUG_REGS && 44x
416 config PGTABLE_LEVELS
421 source "arch/powerpc/sysdev/Kconfig"
422 source "arch/powerpc/platforms/Kconfig"
424 menu "Kernel options"
427 bool "High memory support"
431 source "kernel/Kconfig.hz"
433 config MATH_EMULATION
434 bool "Math emulation"
435 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
438 Some PowerPC chips designed for embedded applications do not have
439 a floating-point unit and therefore do not implement the
440 floating-point instructions in the PowerPC instruction set. If you
441 say Y here, the kernel will include code to emulate a floating-point
442 unit, which will allow programs that use floating-point
445 This is also useful to emulate missing (optional) instructions
446 such as fsqrt on cores that do have an FPU but do not implement
447 them (such as Freescale BookE).
450 prompt "Math emulation options"
451 default MATH_EMULATION_FULL
452 depends on MATH_EMULATION
454 config MATH_EMULATION_FULL
455 bool "Emulate all the floating point instructions"
457 Select this option will enable the kernel to support to emulate
458 all the floating point instructions. If your SoC doesn't have
459 a FPU, you should select this.
461 config MATH_EMULATION_HW_UNIMPLEMENTED
462 bool "Just emulate the FPU unimplemented instructions"
464 Select this if you know there does have a hardware FPU on your
465 SoC, but some floating point instructions are not implemented by that.
469 config PPC_TRANSACTIONAL_MEM
470 bool "Transactional Memory support for POWERPC"
471 depends on PPC_BOOK3S_64
476 Support user-mode Transactional Memory on POWERPC.
479 bool "Ultravisor support"
480 depends on KVM_BOOK3S_HV_POSSIBLE
481 depends on DEVICE_PRIVATE
484 This option paravirtualizes the kernel to run in POWER platforms that
485 supports the Protected Execution Facility (PEF). On such platforms,
486 the ultravisor firmware runs at a privilege level above the
491 config LD_HEAD_STUB_CATCH
492 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
495 Very large kernels can cause linker branch stubs to be generated by
496 code in head_64.S, which moves the head text sections out of their
497 specified location. This option can work around the problem.
501 config MPROFILE_KERNEL
502 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
503 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
506 bool "Support for enabling/disabling CPUs"
507 depends on SMP && (PPC_PSERIES || \
508 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
510 Say Y here to be able to disable and re-enable individual
511 CPUs at runtime on SMP machines.
513 Say N if you are unsure.
515 config PPC_QUEUED_SPINLOCKS
516 bool "Queued spinlocks" if EXPERT
518 default PPC_BOOK3S_64
520 Say Y here to use queued spinlocks which give better scalability and
521 fairness on large SMP and NUMA systems without harming single threaded
524 config ARCH_CPU_PROBE_RELEASE
526 depends on HOTPLUG_CPU
528 config PPC64_SUPPORTS_MEMORY_FAILURE
529 bool "Add support for memory hwpoison"
530 depends on PPC_BOOK3S_64
531 default "y" if PPC_POWERNV
532 select ARCH_SUPPORTS_MEMORY_FAILURE
535 bool "kexec system call"
536 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
539 kexec is a system call that implements the ability to shutdown your
540 current kernel, and to start another kernel. It is like a reboot
541 but it is independent of the system firmware. And like a reboot
542 you can start any kernel with it, not just Linux.
544 The name comes from the similarity to the exec system call.
546 It is an ongoing process to be certain the hardware in a machine
547 is properly shutdown, so do not be surprised if this code does not
548 initially work for you. As of this writing the exact hardware
549 interface is strongly in flux, so no good recommendation can be
553 bool "kexec file based system call"
555 select HAVE_IMA_KEXEC if IMA
560 depends on CRYPTO_SHA256=y
562 This is a new version of the kexec system call. This call is
563 file based and takes in file descriptors as system call arguments
564 for kernel and initramfs as opposed to a list of segments as is the
565 case for the older kexec call.
567 config ARCH_HAS_KEXEC_PURGATORY
571 bool "Build a relocatable kernel"
572 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
573 select NONSTATIC_KERNEL
575 This builds a kernel image that is capable of running at the
576 location the kernel is loaded at. For ppc32, there is no any
577 alignment restrictions, and this feature is a superset of
578 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
579 16k-aligned base address. The kernel is linked as a
580 position-independent executable (PIE) and contains dynamic relocations
581 which are processed early in the bootup process.
583 One use is for the kexec on panic case where the recovery kernel
584 must live at a different physical address than the primary
587 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
588 it has been loaded at and the compile time physical addresses
589 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
590 setting can still be useful to bootwrappers that need to know the
591 load address of the kernel (eg. u-boot/mkimage).
593 config RANDOMIZE_BASE
594 bool "Randomize the address of the kernel image"
595 depends on (FSL_BOOKE && FLATMEM && PPC32)
596 depends on RELOCATABLE
598 Randomizes the virtual address at which the kernel image is
599 loaded, as a security feature that deters exploit attempts
600 relying on knowledge of the location of kernel internals.
604 config RELOCATABLE_TEST
605 bool "Test relocatable kernel"
606 depends on (PPC64 && RELOCATABLE)
608 This runs the relocatable kernel at the address it was initially
609 loaded at, which tends to be non-zero and therefore test the
613 bool "Build a dump capture kernel"
614 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
615 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
617 Build a kernel suitable for use as a dump capture kernel.
618 The same kernel binary can be used as production kernel and dump
622 bool "Firmware-assisted dump"
623 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
627 A robust mechanism to get reliable kernel crash dump with
628 assistance from firmware. This approach does not use kexec,
629 instead firmware assists in booting the capture kernel
630 while preserving memory contents. Firmware-assisted dump
631 is meant to be a kdump replacement offering robustness and
632 speed not possible without system firmware assistance.
634 If unsure, say "y". Only special kernels like petitboot may
635 need to say "N" here.
637 config PRESERVE_FA_DUMP
638 bool "Preserve Firmware-assisted dump"
639 depends on PPC64 && PPC_POWERNV && !FA_DUMP
641 On a kernel with FA_DUMP disabled, this option helps to preserve
642 crash data from a previously crash'ed kernel. Useful when the next
643 memory preserving kernel boot would process this crash data.
644 Petitboot kernel is the typical usecase for this option.
647 bool "Export OPAL memory as /sys/firmware/opal/core"
648 depends on PPC64 && PPC_POWERNV
650 This option uses the MPIPL support in firmware to provide an
651 ELF core of OPAL memory after a crash. The ELF core is exported
652 as /sys/firmware/opal/core file which is helpful in debugging
653 OPAL crashes using GDB.
656 bool "Distribute interrupts on all CPUs by default"
659 This option gives the kernel permission to distribute IRQs across
660 multiple CPUs. Saying N here will route all IRQs to the first
661 CPU. Generally saying Y is safe, although some problems have been
662 reported with SMP Power Macintoshes with this option enabled.
665 bool "NUMA Memory Allocation and Scheduler Support"
666 depends on PPC64 && SMP
667 default y if PPC_PSERIES || PPC_POWERNV
668 select USE_PERCPU_NUMA_NODE_ID
670 Enable NUMA (Non-Uniform Memory Access) support.
672 The kernel will try to allocate memory used by a CPU on the
673 local memory controller of the CPU and add some more
674 NUMA awareness to the kernel.
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
716 default PPC_64K_PAGES if PPC_BOOK3S_64
719 Select the kernel logical page size. Increasing the page size
720 will reduce software overhead at each page boundary, allow
721 hardware prefetch mechanisms to be more effective, and allow
722 larger dma transfers increasing IO efficiency and reducing
723 overhead. However the utilization of memory will increase.
724 For example, each cached file will using a multiple of the
725 page size to hold its contents and the difference between the
726 end of file and the end of page is wasted.
728 Some dedicated systems, such as software raid serving with
729 accelerated calculations, have shown significant increases.
731 If you configure a 64 bit kernel for 64k pages but the
732 processor does not support them, then the kernel will simulate
733 them with 4k pages, loading them on demand, but with the
734 reduced software overhead and larger internal fragmentation.
735 For the 32 bit kernel, a large page option will not be offered
736 unless it is supported by the configured processor.
738 If unsure, choose 4K_PAGES.
742 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
746 depends on 44x || PPC_8xx
750 depends on 44x || PPC_BOOK3S_64
751 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
753 config PPC_256K_PAGES
754 bool "256k page size (Requires non-standard binutils settings)"
755 depends on 44x && !PPC_47x
757 Make the page size 256k.
759 The kernel will only be able to run applications that have been
760 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
761 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
762 definition from 0x10000 to 0x40000 in older versions.
768 depends on PPC_4K_PAGES
770 config PAGE_SIZE_16KB
772 depends on PPC_16K_PAGES
774 config PAGE_SIZE_64KB
776 depends on PPC_64K_PAGES
778 config PAGE_SIZE_256KB
780 depends on PPC_256K_PAGES
782 config PPC_PAGE_SHIFT
784 default 18 if PPC_256K_PAGES
785 default 16 if PPC_64K_PAGES
786 default 14 if PPC_16K_PAGES
790 int "Thread shift" if EXPERT
792 default "15" if PPC_256K_PAGES
793 default "14" if PPC64
796 Used to define the stack size. The default is almost always what you
797 want. Only change this if you know what you are doing.
799 config DATA_SHIFT_BOOL
800 bool "Set custom data alignment"
801 depends on ADVANCED_OPTIONS
802 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
803 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
806 This option allows you to set the kernel data alignment. When
807 RAM is mapped by blocks, the alignment needs to fit the size and
808 number of possible blocks. The default should be OK for most configs.
810 Say N here unless you know what you are doing.
813 int "Data shift" if DATA_SHIFT_BOOL
814 default 24 if STRICT_KERNEL_RWX && PPC64
815 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
816 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
817 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
818 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
819 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
820 default 23 if STRICT_KERNEL_RWX && PPC_8xx
821 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
822 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
823 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
824 default PPC_PAGE_SHIFT
826 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
827 Smaller is the alignment, greater is the number of necessary DBATs.
829 On 8xx, large pages (512kb or 8M) are used to map kernel linear
830 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
831 in that case. If PIN_TLB is selected, it must be aligned to 8M as
832 8M pages will be pinned.
834 config FORCE_MAX_ZONEORDER
835 int "Maximum zone order"
836 range 8 9 if PPC64 && PPC_64K_PAGES
837 default "9" if PPC64 && PPC_64K_PAGES
838 range 13 13 if PPC64 && !PPC_64K_PAGES
839 default "13" if PPC64 && !PPC_64K_PAGES
840 range 9 64 if PPC32 && PPC_16K_PAGES
841 default "9" if PPC32 && PPC_16K_PAGES
842 range 7 64 if PPC32 && PPC_64K_PAGES
843 default "7" if PPC32 && PPC_64K_PAGES
844 range 5 64 if PPC32 && PPC_256K_PAGES
845 default "5" if PPC32 && PPC_256K_PAGES
849 The kernel memory allocator divides physically contiguous memory
850 blocks into "zones", where each zone is a power of two number of
851 pages. This option selects the largest power of two that the kernel
852 keeps in the memory allocator. If you need to allocate very large
853 blocks of physically contiguous memory, then you may need to
856 This config option is actually maximum order plus one. For example,
857 a value of 11 means that the largest free memory block is 2^10 pages.
859 The page size is not necessarily 4KB. For example, on 64-bit
860 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
861 this in mind when choosing a value for this option.
863 config PPC_SUBPAGE_PROT
864 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
866 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
868 This option adds support for system call to allow user programs
869 to set access permissions (read/write, readonly, or no access)
870 on the 4k subpages of each 64k page.
872 If unsure, say N here.
874 config PPC_PROT_SAO_LPAR
875 bool "Support PROT_SAO mappings in LPARs"
876 depends on PPC_BOOK3S_64
878 This option adds support for PROT_SAO mappings from userspace
879 inside LPARs on supported CPUs.
881 This may cause issues when performing guest migration from
882 a CPU that supports SAO to one that does not.
884 If unsure, say N here.
886 config PPC_COPRO_BASE
890 bool "SMT (Hyperthreading) scheduler support"
891 depends on PPC64 && SMP
893 SMT scheduler support improves the CPU scheduler's decision making
894 when dealing with POWER5 cpus at a cost of slightly increased
895 overhead in some places. If unsure say N here.
897 config PPC_DENORMALISATION
898 bool "PowerPC denormalisation exception handling"
899 depends on PPC_BOOK3S_64
900 default "y" if PPC_POWERNV
902 Add support for handling denormalisation of single precision
903 values. Useful for bare metal only. If unsure say Y here.
906 string "Initial kernel command string"
909 On some platforms, there is currently no way for the boot loader to
910 pass arguments to the kernel. For these platforms, you can supply
911 some command-line options at build time by entering them here. In
912 most cases you will need to specify the root device here.
915 prompt "Kernel command line type" if CMDLINE != ""
916 default CMDLINE_FROM_BOOTLOADER
918 config CMDLINE_FROM_BOOTLOADER
919 bool "Use bootloader kernel arguments if available"
921 Uses the command-line options passed by the boot loader. If
922 the boot loader doesn't provide any, the default kernel command
923 string provided in CMDLINE will be used.
925 config CMDLINE_EXTEND
926 bool "Extend bootloader kernel arguments"
928 The command-line arguments provided by the boot loader will be
929 appended to the default kernel command string.
932 bool "Always use the default kernel command string"
934 Always use the default kernel command string, even if the boot
935 loader passes other arguments to the kernel.
936 This is useful if you cannot or don't want to change the
937 command-line options your boot loader passes to the kernel.
942 string "Additional default image types"
944 List additional targets to be built by the bootwrapper here (separated
945 by spaces). This is useful for targets that depend of device tree
946 files in the .dts directory.
948 Targets in this list will be build as part of the default build
949 target, or when the user does a 'make zImage' or a
950 'make zImage.initrd'.
952 If unsure, leave blank
954 config ARCH_WANTS_FREEZER_CONTROL
958 source "kernel/power/Kconfig"
961 prompt "PowerPC Memory Protection Keys"
963 depends on PPC_BOOK3S_64
964 depends on PPC_64S_HASH_MMU
965 select ARCH_USES_HIGH_VMA_FLAGS
966 select ARCH_HAS_PKEYS
968 Memory Protection Keys provides a mechanism for enforcing
969 page-based protections, but without requiring modification of the
970 page tables when an application changes protection domains.
972 For details, see Documentation/core-api/protection-keys.rst
976 config PPC_SECURE_BOOT
977 prompt "Enable secure boot support"
979 depends on PPC_POWERNV || PPC_PSERIES
980 depends on IMA_ARCH_POLICY
981 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
983 Systems with firmware secure boot enabled need to define security
984 policies to extend secure boot to the OS. This config allows a user
985 to enable OS secure boot on systems that have firmware support for
986 it. If in doubt say N.
988 config PPC_SECVAR_SYSFS
989 bool "Enable sysfs interface for POWER secure variables"
991 depends on PPC_SECURE_BOOT
994 POWER secure variables are managed and controlled by firmware.
995 These variables are exposed to userspace via sysfs to enable
996 read/write operations on these variables. Say Y if you have
997 secure boot enabled and want to expose variables to userspace.
999 config PPC_RTAS_FILTER
1000 bool "Enable filtering of RTAS syscalls"
1004 The RTAS syscall API has security issues that could be used to
1005 compromise system integrity. This option enforces restrictions on the
1006 RTAS calls and arguments passed by userspace programs to mitigate
1009 Say Y unless you know what you are doing and the filter is causing
1021 bool "Support for ISA-bus hardware"
1025 Find out whether you have ISA slots on your motherboard. ISA is the
1026 name of a bus system, i.e. the way the CPU talks to the other stuff
1027 inside your box. If you have an Apple machine, say N here; if you
1028 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1029 embedded board, consult your board documentation.
1031 config GENERIC_ISA_DMA
1033 depends on ISA_DMA_API
1036 config PPC_INDIRECT_PCI
1039 default y if 40x || 44x
1049 select ARCH_HAS_DMA_SET_MASK
1050 select PPC_INDIRECT_PCI
1056 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1058 Freescale MPC85xx/MPC86xx power management controller support
1059 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1064 depends on SUSPEND && (44x || 40x)
1066 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1067 It also enables support for two different idle states (idle-wait
1074 bool "Freescale Local Bus support"
1076 Enables reporting of errors from the Freescale local bus
1077 controller. Also contains some common code used by
1078 drivers for specific local bus peripherals.
1082 depends on PPC_83xx || QUICC_ENGINE || CPM2
1084 Freescale General-purpose Timers support
1088 depends on PCI && 8260
1089 select PPC_INDIRECT_PCI
1093 bool "Freescale Embedded SRIO Controller support"
1094 depends on RAPIDIO = y && HAVE_RAPIDIO
1097 Include support for RapidIO controller on Freescale embedded
1098 processors (MPC8548, MPC8641, etc).
1102 config NONSTATIC_KERNEL
1105 menu "Advanced setup"
1108 config ADVANCED_OPTIONS
1109 bool "Prompt for advanced kernel configuration options"
1111 This option will enable prompting for a variety of advanced kernel
1112 configuration options. These options can cause the kernel to not
1113 work if they are set incorrectly, but can be used to optimize certain
1114 aspects of kernel memory management.
1116 Unless you know what you are doing, say N here.
1118 comment "Default settings for advanced configuration options are used"
1119 depends on !ADVANCED_OPTIONS
1121 config LOWMEM_SIZE_BOOL
1122 bool "Set maximum low memory"
1123 depends on ADVANCED_OPTIONS
1125 This option allows you to set the maximum amount of memory which
1126 will be used as "low memory", that is, memory which the kernel can
1127 access directly, without having to set up a kernel virtual mapping.
1128 This can be useful in optimizing the layout of kernel virtual
1131 Say N here unless you know what you are doing.
1134 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1135 default "0x30000000"
1137 config LOWMEM_CAM_NUM_BOOL
1138 bool "Set number of CAMs to use to map low memory"
1139 depends on ADVANCED_OPTIONS && FSL_BOOKE
1141 This option allows you to set the maximum number of CAM slots that
1142 will be used to map low memory. There are a limited number of slots
1143 available and even more limited number that will fit in the L1 MMU.
1144 However, using more entries will allow mapping more low memory. This
1145 can be useful in optimizing the layout of kernel virtual memory.
1147 Say N here unless you know what you are doing.
1149 config LOWMEM_CAM_NUM
1150 depends on FSL_BOOKE
1151 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1152 default 3 if !STRICT_KERNEL_RWX
1153 default 9 if DATA_SHIFT >= 24
1154 default 12 if DATA_SHIFT >= 22
1157 config DYNAMIC_MEMSTART
1158 bool "Enable page aligned dynamic load address for kernel"
1159 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1160 select NONSTATIC_KERNEL
1162 This option enables the kernel to be loaded at any page aligned
1163 physical address. The kernel creates a mapping from KERNELBASE to
1164 the address where the kernel is loaded. The page size here implies
1165 the TLB page size of the mapping for kernel on the particular platform.
1166 Please refer to the init code for finding the TLB page size.
1168 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1169 kernel image, where the only restriction is the page aligned kernel
1170 load address. When this option is enabled, the compile time physical
1171 address CONFIG_PHYSICAL_START is ignored.
1173 This option is overridden by CONFIG_RELOCATABLE
1175 config PAGE_OFFSET_BOOL
1176 bool "Set custom page offset address"
1177 depends on ADVANCED_OPTIONS
1179 This option allows you to set the kernel virtual address at which
1180 the kernel will map low memory. This can be useful in optimizing
1181 the virtual memory layout of the system.
1183 Say N here unless you know what you are doing.
1186 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1187 default "0xc0000000"
1189 config KERNEL_START_BOOL
1190 bool "Set custom kernel base address"
1191 depends on ADVANCED_OPTIONS
1193 This option allows you to set the kernel virtual address at which
1194 the kernel will be loaded. Normally this should match PAGE_OFFSET
1195 however there are times (like kdump) that one might not want them
1198 Say N here unless you know what you are doing.
1201 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1202 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1203 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1204 default "0xc0000000"
1206 config PHYSICAL_START_BOOL
1207 bool "Set physical address where the kernel is loaded"
1208 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1210 This gives the physical address where the kernel is loaded.
1212 Say N here unless you know what you are doing.
1214 config PHYSICAL_START
1215 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1216 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1217 default "0x00000000"
1219 config PHYSICAL_ALIGN
1221 default "0x04000000" if FSL_BOOKE
1223 This value puts the alignment restrictions on physical address
1224 where kernel is loaded and run from. Kernel is compiled for an
1225 address which meets above alignment restriction.
1227 config TASK_SIZE_BOOL
1228 bool "Set custom user task size"
1229 depends on ADVANCED_OPTIONS
1231 This option allows you to set the amount of virtual address space
1232 allocated to user tasks. This can be useful in optimizing the
1233 virtual memory layout of the system.
1235 Say N here unless you know what you are doing.
1238 hex "Size of user task space" if TASK_SIZE_BOOL
1239 default "0x80000000" if PPC_8xx
1240 default "0xb0000000" if PPC_BOOK3S_32
1241 default "0xc0000000"
1245 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1248 default "0xc000000000000000"
1251 default "0xc000000000000000"
1252 config PHYSICAL_START
1254 default "0x00000000"
1260 config PPC_LIB_RHEAP
1263 source "arch/powerpc/kvm/Kconfig"
1265 source "kernel/livepatch/Kconfig"