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 PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE
139 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
140 select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT
141 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
142 select ARCH_HAS_UACCESS_FLUSHCACHE
143 select ARCH_HAS_UBSAN_SANITIZE_ALL
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_RANDOMIZE_KSTACK_OFFSET
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_USER 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_ARGS if MPROFILE_KERNEL || PPC32
213 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
215 select HAVE_EFFICIENT_UNALIGNED_ACCESS
217 select HAVE_FTRACE_MCOUNT_RECORD
218 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
219 select HAVE_FUNCTION_ERROR_INJECTION
220 select HAVE_FUNCTION_GRAPH_TRACER
221 select HAVE_FUNCTION_TRACER
222 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
223 select HAVE_GENERIC_VDSO
224 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
225 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
226 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
227 select HAVE_IOREMAP_PROT
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_SETUP_PER_CPU_AREA if PPC64
249 select HAVE_SOFTIRQ_ON_OWN_STACK
250 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
251 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
252 select HAVE_STATIC_CALL if PPC32
253 select HAVE_SYSCALL_TRACEPOINTS
254 select HAVE_VIRT_CPU_ACCOUNTING
255 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
256 select IOMMU_HELPER if PPC64
258 select IRQ_FORCED_THREADING
259 select KASAN_VMALLOC if KASAN && MODULES
260 select MMU_GATHER_PAGE_SIZE
261 select MMU_GATHER_RCU_TABLE_FREE
262 select MMU_GATHER_MERGE_VMAS
263 select MODULES_USE_ELF_RELA
264 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
265 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
266 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
267 select NEED_SG_DMA_LENGTH
269 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
270 select OF_EARLY_FLATTREE
271 select OLD_SIGACTION if PPC32
272 select OLD_SIGSUSPEND
273 select PCI_DOMAINS if PCI
274 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
275 select PCI_SYSCALL if PCI
276 select PPC_DAWR if PPC64
279 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
280 select SYSCTL_EXCEPTION_TRACE
281 select THREAD_INFO_IN_TASK
282 select TRACE_IRQFLAGS_SUPPORT
284 # Please keep this list sorted alphabetically.
287 config PPC_LONG_DOUBLE_128
289 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
291 config PPC_BARRIER_NOSPEC
294 depends on PPC_BOOK3S_64 || PPC_E500
305 bool "Enable support for 32bit binaries"
307 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
308 default y if !CPU_LITTLE_ENDIAN
309 select ARCH_WANT_OLD_COMPAT_IPC
310 select COMPAT_OLD_SIGACTION
312 config SCHED_OMIT_FRAME_POINTER
316 config ARCH_MAY_HAVE_PC_FDC
320 config PPC_UDBG_16550
323 config GENERIC_TBSYNC
325 default y if PPC32 && SMP
336 config GENERIC_BUG_RELATIVE_POINTERS
338 depends on GENERIC_BUG
340 config SYS_SUPPORTS_APM_EMULATION
341 default y if PMAC_APM_EMU
347 Used to allow a board to specify it wants an ePAPR compliant wrapper.
349 config DEFAULT_UIMAGE
352 Used to allow a board to specify it wants a uImage built by default
354 config ARCH_HIBERNATION_POSSIBLE
358 config ARCH_SUSPEND_POSSIBLE
360 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
361 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
364 config ARCH_SUSPEND_NONZERO_CPU
366 depends on PPC_POWERNV || PPC_PSERIES
368 config ARCH_HAS_ADD_PAGES
370 depends on ARCH_ENABLE_MEMORY_HOTPLUG
372 config PPC_DCR_NATIVE
380 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
383 config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
385 depends on !PPC_PMAC && !PPC_CHRP
386 bool "Assign PCI bus numbers from zero individually for each PCI domain"
388 By default on PPC32 were PCI bus numbers unique across all PCI domains.
389 So system could have only 256 PCI buses independently of available
390 PCI domains. When this option is enabled then PCI bus numbers are
391 PCI domain dependent and each PCI controller on own domain can have
392 256 PCI buses, like it is on other Linux architectures.
394 config PPC_OF_PLATFORM_PCI
397 depends on PPC64 # not supported on 32 bits yet
399 config ARCH_SUPPORTS_UPROBES
402 config PPC_ADV_DEBUG_REGS
404 depends on 40x || BOOKE
407 config PPC_ADV_DEBUG_IACS
409 depends on PPC_ADV_DEBUG_REGS
413 config PPC_ADV_DEBUG_DACS
415 depends on PPC_ADV_DEBUG_REGS
418 config PPC_ADV_DEBUG_DVCS
420 depends on PPC_ADV_DEBUG_REGS
424 config PPC_ADV_DEBUG_DAC_RANGE
426 depends on PPC_ADV_DEBUG_REGS && 44x
432 config PGTABLE_LEVELS
437 source "arch/powerpc/sysdev/Kconfig"
438 source "arch/powerpc/platforms/Kconfig"
440 menu "Kernel options"
443 bool "High memory support"
447 source "kernel/Kconfig.hz"
449 config MATH_EMULATION
450 bool "Math emulation"
451 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
454 Some PowerPC chips designed for embedded applications do not have
455 a floating-point unit and therefore do not implement the
456 floating-point instructions in the PowerPC instruction set. If you
457 say Y here, the kernel will include code to emulate a floating-point
458 unit, which will allow programs that use floating-point
461 This is also useful to emulate missing (optional) instructions
462 such as fsqrt on cores that do have an FPU but do not implement
463 them (such as Freescale BookE).
466 prompt "Math emulation options"
467 default MATH_EMULATION_FULL
468 depends on MATH_EMULATION
470 config MATH_EMULATION_FULL
471 bool "Emulate all the floating point instructions"
473 Select this option will enable the kernel to support to emulate
474 all the floating point instructions. If your SoC doesn't have
475 a FPU, you should select this.
477 config MATH_EMULATION_HW_UNIMPLEMENTED
478 bool "Just emulate the FPU unimplemented instructions"
480 Select this if you know there does have a hardware FPU on your
481 SoC, but some floating point instructions are not implemented by that.
485 config PPC_TRANSACTIONAL_MEM
486 bool "Transactional Memory support for POWERPC"
487 depends on PPC_BOOK3S_64
492 Support user-mode Transactional Memory on POWERPC.
495 bool "Ultravisor support"
496 depends on KVM_BOOK3S_HV_POSSIBLE
497 depends on DEVICE_PRIVATE
500 This option paravirtualizes the kernel to run in POWER platforms that
501 supports the Protected Execution Facility (PEF). On such platforms,
502 the ultravisor firmware runs at a privilege level above the
507 config LD_HEAD_STUB_CATCH
508 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
511 Very large kernels can cause linker branch stubs to be generated by
512 code in head_64.S, which moves the head text sections out of their
513 specified location. This option can work around the problem.
517 config MPROFILE_KERNEL
518 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
519 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
522 bool "Support for enabling/disabling CPUs"
523 depends on SMP && (PPC_PSERIES || \
524 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
526 Say Y here to be able to disable and re-enable individual
527 CPUs at runtime on SMP machines.
529 Say N if you are unsure.
531 config PPC_QUEUED_SPINLOCKS
532 bool "Queued spinlocks" if EXPERT
534 default PPC_BOOK3S_64
536 Say Y here to use queued spinlocks which give better scalability and
537 fairness on large SMP and NUMA systems without harming single threaded
540 config ARCH_CPU_PROBE_RELEASE
542 depends on HOTPLUG_CPU
544 config PPC64_SUPPORTS_MEMORY_FAILURE
545 bool "Add support for memory hwpoison"
546 depends on PPC_BOOK3S_64
547 default "y" if PPC_POWERNV
548 select ARCH_SUPPORTS_MEMORY_FAILURE
551 bool "kexec system call"
552 depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP)
555 kexec is a system call that implements the ability to shutdown your
556 current kernel, and to start another kernel. It is like a reboot
557 but it is independent of the system firmware. And like a reboot
558 you can start any kernel with it, not just Linux.
560 The name comes from the similarity to the exec system call.
562 It is an ongoing process to be certain the hardware in a machine
563 is properly shutdown, so do not be surprised if this code does not
564 initially work for you. As of this writing the exact hardware
565 interface is strongly in flux, so no good recommendation can be
569 bool "kexec file based system call"
571 select HAVE_IMA_KEXEC if IMA
575 depends on CRYPTO_SHA256=y
577 This is a new version of the kexec system call. This call is
578 file based and takes in file descriptors as system call arguments
579 for kernel and initramfs as opposed to a list of segments as is the
580 case for the older kexec call.
582 config ARCH_HAS_KEXEC_PURGATORY
586 bool "Build a relocatable kernel"
587 depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
588 select NONSTATIC_KERNEL
590 This builds a kernel image that is capable of running at the
591 location the kernel is loaded at. For ppc32, there is no any
592 alignment restrictions, and this feature is a superset of
593 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
594 16k-aligned base address. The kernel is linked as a
595 position-independent executable (PIE) and contains dynamic relocations
596 which are processed early in the bootup process.
598 One use is for the kexec on panic case where the recovery kernel
599 must live at a different physical address than the primary
602 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
603 it has been loaded at and the compile time physical addresses
604 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
605 setting can still be useful to bootwrappers that need to know the
606 load address of the kernel (eg. u-boot/mkimage).
608 config RANDOMIZE_BASE
609 bool "Randomize the address of the kernel image"
610 depends on PPC_85xx && FLATMEM
611 depends on RELOCATABLE
613 Randomizes the virtual address at which the kernel image is
614 loaded, as a security feature that deters exploit attempts
615 relying on knowledge of the location of kernel internals.
619 config RELOCATABLE_TEST
620 bool "Test relocatable kernel"
621 depends on (PPC64 && RELOCATABLE)
623 This runs the relocatable kernel at the address it was initially
624 loaded at, which tends to be non-zero and therefore test the
628 bool "Build a dump capture kernel"
629 depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
630 select RELOCATABLE if PPC64 || 44x || PPC_85xx
632 Build a kernel suitable for use as a dump capture kernel.
633 The same kernel binary can be used as production kernel and dump
637 bool "Firmware-assisted dump"
638 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
642 A robust mechanism to get reliable kernel crash dump with
643 assistance from firmware. This approach does not use kexec,
644 instead firmware assists in booting the capture kernel
645 while preserving memory contents. Firmware-assisted dump
646 is meant to be a kdump replacement offering robustness and
647 speed not possible without system firmware assistance.
649 If unsure, say "y". Only special kernels like petitboot may
650 need to say "N" here.
652 config PRESERVE_FA_DUMP
653 bool "Preserve Firmware-assisted dump"
654 depends on PPC64 && PPC_POWERNV && !FA_DUMP
656 On a kernel with FA_DUMP disabled, this option helps to preserve
657 crash data from a previously crash'ed kernel. Useful when the next
658 memory preserving kernel boot would process this crash data.
659 Petitboot kernel is the typical usecase for this option.
662 bool "Export OPAL memory as /sys/firmware/opal/core"
663 depends on PPC64 && PPC_POWERNV
665 This option uses the MPIPL support in firmware to provide an
666 ELF core of OPAL memory after a crash. The ELF core is exported
667 as /sys/firmware/opal/core file which is helpful in debugging
668 OPAL crashes using GDB.
671 bool "Distribute interrupts on all CPUs by default"
674 This option gives the kernel permission to distribute IRQs across
675 multiple CPUs. Saying N here will route all IRQs to the first
676 CPU. Generally saying Y is safe, although some problems have been
677 reported with SMP Power Macintoshes with this option enabled.
680 bool "NUMA Memory Allocation and Scheduler Support"
681 depends on PPC64 && SMP
682 default y if PPC_PSERIES || PPC_POWERNV
683 select USE_PERCPU_NUMA_NODE_ID
685 Enable NUMA (Non-Uniform Memory Access) support.
687 The kernel will try to allocate memory used by a CPU on the
688 local memory controller of the CPU and add some more
689 NUMA awareness to the kernel.
697 config HAVE_MEMORYLESS_NODES
701 config ARCH_SELECT_MEMORY_MODEL
705 config ARCH_FLATMEM_ENABLE
707 depends on (PPC64 && !NUMA) || PPC32
709 config ARCH_SPARSEMEM_ENABLE
712 select SPARSEMEM_VMEMMAP_ENABLE
714 config ARCH_SPARSEMEM_DEFAULT
716 depends on PPC_BOOK3S_64
718 config ILLEGAL_POINTER_VALUE
720 # This is roughly half way between the top of user space and the bottom
721 # of kernel space, which seems about as good as we can get.
722 default 0x5deadbeef0000000 if PPC64
725 config ARCH_MEMORY_PROBE
727 depends on MEMORY_HOTPLUG
731 default PPC_64K_PAGES if PPC_BOOK3S_64
734 Select the kernel logical page size. Increasing the page size
735 will reduce software overhead at each page boundary, allow
736 hardware prefetch mechanisms to be more effective, and allow
737 larger dma transfers increasing IO efficiency and reducing
738 overhead. However the utilization of memory will increase.
739 For example, each cached file will using a multiple of the
740 page size to hold its contents and the difference between the
741 end of file and the end of page is wasted.
743 Some dedicated systems, such as software raid serving with
744 accelerated calculations, have shown significant increases.
746 If you configure a 64 bit kernel for 64k pages but the
747 processor does not support them, then the kernel will simulate
748 them with 4k pages, loading them on demand, but with the
749 reduced software overhead and larger internal fragmentation.
750 For the 32 bit kernel, a large page option will not be offered
751 unless it is supported by the configured processor.
753 If unsure, choose 4K_PAGES.
757 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
761 depends on 44x || PPC_8xx
765 depends on 44x || PPC_BOOK3S_64
766 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
768 config PPC_256K_PAGES
769 bool "256k page size (Requires non-standard binutils settings)"
770 depends on 44x && !PPC_47x
772 Make the page size 256k.
774 The kernel will only be able to run applications that have been
775 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
776 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
777 definition from 0x10000 to 0x40000 in older versions.
783 depends on PPC_4K_PAGES
785 config PAGE_SIZE_16KB
787 depends on PPC_16K_PAGES
789 config PAGE_SIZE_64KB
791 depends on PPC_64K_PAGES
793 config PAGE_SIZE_256KB
795 depends on PPC_256K_PAGES
797 config PPC_PAGE_SHIFT
799 default 18 if PPC_256K_PAGES
800 default 16 if PPC_64K_PAGES
801 default 14 if PPC_16K_PAGES
805 int "Thread shift" if EXPERT
807 default "15" if PPC_256K_PAGES
808 default "14" if PPC64
811 Used to define the stack size. The default is almost always what you
812 want. Only change this if you know what you are doing.
814 config DATA_SHIFT_BOOL
815 bool "Set custom data alignment"
816 depends on ADVANCED_OPTIONS
817 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
818 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
821 This option allows you to set the kernel data alignment. When
822 RAM is mapped by blocks, the alignment needs to fit the size and
823 number of possible blocks. The default should be OK for most configs.
825 Say N here unless you know what you are doing.
828 int "Data shift" if DATA_SHIFT_BOOL
829 default 24 if STRICT_KERNEL_RWX && PPC64
830 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
831 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
832 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
833 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
834 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
835 default 23 if STRICT_KERNEL_RWX && PPC_8xx
836 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
837 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
838 default 24 if STRICT_KERNEL_RWX && PPC_85xx
839 default PPC_PAGE_SHIFT
841 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
842 Smaller is the alignment, greater is the number of necessary DBATs.
844 On 8xx, large pages (512kb or 8M) are used to map kernel linear
845 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
846 in that case. If PIN_TLB is selected, it must be aligned to 8M as
847 8M pages will be pinned.
849 config FORCE_MAX_ZONEORDER
850 int "Maximum zone order"
851 range 8 9 if PPC64 && PPC_64K_PAGES
852 default "9" if PPC64 && PPC_64K_PAGES
853 range 13 13 if PPC64 && !PPC_64K_PAGES
854 default "13" if PPC64 && !PPC_64K_PAGES
855 range 9 64 if PPC32 && PPC_16K_PAGES
856 default "9" if PPC32 && PPC_16K_PAGES
857 range 7 64 if PPC32 && PPC_64K_PAGES
858 default "7" if PPC32 && PPC_64K_PAGES
859 range 5 64 if PPC32 && PPC_256K_PAGES
860 default "5" if PPC32 && PPC_256K_PAGES
864 The kernel memory allocator divides physically contiguous memory
865 blocks into "zones", where each zone is a power of two number of
866 pages. This option selects the largest power of two that the kernel
867 keeps in the memory allocator. If you need to allocate very large
868 blocks of physically contiguous memory, then you may need to
871 This config option is actually maximum order plus one. For example,
872 a value of 11 means that the largest free memory block is 2^10 pages.
874 The page size is not necessarily 4KB. For example, on 64-bit
875 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
876 this in mind when choosing a value for this option.
878 config PPC_SUBPAGE_PROT
879 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
881 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
883 This option adds support for system call to allow user programs
884 to set access permissions (read/write, readonly, or no access)
885 on the 4k subpages of each 64k page.
887 If unsure, say N here.
889 config PPC_PROT_SAO_LPAR
890 bool "Support PROT_SAO mappings in LPARs"
891 depends on PPC_BOOK3S_64
893 This option adds support for PROT_SAO mappings from userspace
894 inside LPARs on supported CPUs.
896 This may cause issues when performing guest migration from
897 a CPU that supports SAO to one that does not.
899 If unsure, say N here.
901 config PPC_COPRO_BASE
905 bool "SMT (Hyperthreading) scheduler support"
906 depends on PPC64 && SMP
908 SMT scheduler support improves the CPU scheduler's decision making
909 when dealing with POWER5 cpus at a cost of slightly increased
910 overhead in some places. If unsure say N here.
912 config PPC_DENORMALISATION
913 bool "PowerPC denormalisation exception handling"
914 depends on PPC_BOOK3S_64
915 default "y" if PPC_POWERNV
917 Add support for handling denormalisation of single precision
918 values. Useful for bare metal only. If unsure say Y here.
921 string "Initial kernel command string"
924 On some platforms, there is currently no way for the boot loader to
925 pass arguments to the kernel. For these platforms, you can supply
926 some command-line options at build time by entering them here. In
927 most cases you will need to specify the root device here.
930 prompt "Kernel command line type" if CMDLINE != ""
931 default CMDLINE_FROM_BOOTLOADER
933 config CMDLINE_FROM_BOOTLOADER
934 bool "Use bootloader kernel arguments if available"
936 Uses the command-line options passed by the boot loader. If
937 the boot loader doesn't provide any, the default kernel command
938 string provided in CMDLINE will be used.
940 config CMDLINE_EXTEND
941 bool "Extend bootloader kernel arguments"
943 The command-line arguments provided by the boot loader will be
944 appended to the default kernel command string.
947 bool "Always use the default kernel command string"
949 Always use the default kernel command string, even if the boot
950 loader passes other arguments to the kernel.
951 This is useful if you cannot or don't want to change the
952 command-line options your boot loader passes to the kernel.
957 string "Additional default image types"
959 List additional targets to be built by the bootwrapper here (separated
960 by spaces). This is useful for targets that depend of device tree
961 files in the .dts directory.
963 Targets in this list will be build as part of the default build
964 target, or when the user does a 'make zImage' or a
965 'make zImage.initrd'.
967 If unsure, leave blank
969 config ARCH_WANTS_FREEZER_CONTROL
973 source "kernel/power/Kconfig"
976 prompt "PowerPC Memory Protection Keys"
978 depends on PPC_BOOK3S_64
979 depends on PPC_64S_HASH_MMU
980 select ARCH_USES_HIGH_VMA_FLAGS
981 select ARCH_HAS_PKEYS
983 Memory Protection Keys provides a mechanism for enforcing
984 page-based protections, but without requiring modification of the
985 page tables when an application changes protection domains.
987 For details, see Documentation/core-api/protection-keys.rst
991 config PPC_SECURE_BOOT
992 prompt "Enable secure boot support"
994 depends on PPC_POWERNV || PPC_PSERIES
995 depends on IMA_ARCH_POLICY
996 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
998 Systems with firmware secure boot enabled need to define security
999 policies to extend secure boot to the OS. This config allows a user
1000 to enable OS secure boot on systems that have firmware support for
1001 it. If in doubt say N.
1003 config PPC_SECVAR_SYSFS
1004 bool "Enable sysfs interface for POWER secure variables"
1006 depends on PPC_SECURE_BOOT
1009 POWER secure variables are managed and controlled by firmware.
1010 These variables are exposed to userspace via sysfs to enable
1011 read/write operations on these variables. Say Y if you have
1012 secure boot enabled and want to expose variables to userspace.
1014 config PPC_RTAS_FILTER
1015 bool "Enable filtering of RTAS syscalls"
1019 The RTAS syscall API has security issues that could be used to
1020 compromise system integrity. This option enforces restrictions on the
1021 RTAS calls and arguments passed by userspace programs to mitigate
1024 Say Y unless you know what you are doing and the filter is causing
1036 bool "Support for ISA-bus hardware"
1040 Find out whether you have ISA slots on your motherboard. ISA is the
1041 name of a bus system, i.e. the way the CPU talks to the other stuff
1042 inside your box. If you have an Apple machine, say N here; if you
1043 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1044 embedded board, consult your board documentation.
1046 config GENERIC_ISA_DMA
1048 depends on ISA_DMA_API
1051 config PPC_INDIRECT_PCI
1054 default y if 40x || 44x
1064 select ARCH_HAS_DMA_SET_MASK
1065 select PPC_INDIRECT_PCI
1071 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1073 Freescale MPC85xx/MPC86xx power management controller support
1074 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1079 depends on SUSPEND && (44x || 40x)
1081 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1082 It also enables support for two different idle states (idle-wait
1089 bool "Freescale Local Bus support"
1091 Enables reporting of errors from the Freescale local bus
1092 controller. Also contains some common code used by
1093 drivers for specific local bus peripherals.
1097 depends on PPC_83xx || QUICC_ENGINE || CPM2
1099 Freescale General-purpose Timers support
1103 depends on PCI && 8260
1104 select PPC_INDIRECT_PCI
1108 bool "Freescale Embedded SRIO Controller support"
1109 depends on RAPIDIO = y && HAVE_RAPIDIO
1112 Include support for RapidIO controller on Freescale embedded
1113 processors (MPC8548, MPC8641, etc).
1117 config NONSTATIC_KERNEL
1120 menu "Advanced setup"
1123 config ADVANCED_OPTIONS
1124 bool "Prompt for advanced kernel configuration options"
1126 This option will enable prompting for a variety of advanced kernel
1127 configuration options. These options can cause the kernel to not
1128 work if they are set incorrectly, but can be used to optimize certain
1129 aspects of kernel memory management.
1131 Unless you know what you are doing, say N here.
1133 comment "Default settings for advanced configuration options are used"
1134 depends on !ADVANCED_OPTIONS
1136 config LOWMEM_SIZE_BOOL
1137 bool "Set maximum low memory"
1138 depends on ADVANCED_OPTIONS
1140 This option allows you to set the maximum amount of memory which
1141 will be used as "low memory", that is, memory which the kernel can
1142 access directly, without having to set up a kernel virtual mapping.
1143 This can be useful in optimizing the layout of kernel virtual
1146 Say N here unless you know what you are doing.
1149 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1150 default "0x30000000"
1152 config LOWMEM_CAM_NUM_BOOL
1153 bool "Set number of CAMs to use to map low memory"
1154 depends on ADVANCED_OPTIONS && PPC_85xx
1156 This option allows you to set the maximum number of CAM slots that
1157 will be used to map low memory. There are a limited number of slots
1158 available and even more limited number that will fit in the L1 MMU.
1159 However, using more entries will allow mapping more low memory. This
1160 can be useful in optimizing the layout of kernel virtual memory.
1162 Say N here unless you know what you are doing.
1164 config LOWMEM_CAM_NUM
1166 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1167 default 3 if !STRICT_KERNEL_RWX
1168 default 9 if DATA_SHIFT >= 24
1169 default 12 if DATA_SHIFT >= 22
1172 config DYNAMIC_MEMSTART
1173 bool "Enable page aligned dynamic load address for kernel"
1174 depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
1175 select NONSTATIC_KERNEL
1177 This option enables the kernel to be loaded at any page aligned
1178 physical address. The kernel creates a mapping from KERNELBASE to
1179 the address where the kernel is loaded. The page size here implies
1180 the TLB page size of the mapping for kernel on the particular platform.
1181 Please refer to the init code for finding the TLB page size.
1183 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1184 kernel image, where the only restriction is the page aligned kernel
1185 load address. When this option is enabled, the compile time physical
1186 address CONFIG_PHYSICAL_START is ignored.
1188 This option is overridden by CONFIG_RELOCATABLE
1190 config PAGE_OFFSET_BOOL
1191 bool "Set custom page offset address"
1192 depends on ADVANCED_OPTIONS
1194 This option allows you to set the kernel virtual address at which
1195 the kernel will map low memory. This can be useful in optimizing
1196 the virtual memory layout of the system.
1198 Say N here unless you know what you are doing.
1201 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1202 default "0xc0000000"
1204 config KERNEL_START_BOOL
1205 bool "Set custom kernel base address"
1206 depends on ADVANCED_OPTIONS
1208 This option allows you to set the kernel virtual address at which
1209 the kernel will be loaded. Normally this should match PAGE_OFFSET
1210 however there are times (like kdump) that one might not want them
1213 Say N here unless you know what you are doing.
1216 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1217 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1218 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1219 default "0xc0000000"
1221 config PHYSICAL_START_BOOL
1222 bool "Set physical address where the kernel is loaded"
1223 depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
1225 This gives the physical address where the kernel is loaded.
1227 Say N here unless you know what you are doing.
1229 config PHYSICAL_START
1230 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1231 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1232 default "0x00000000"
1234 config PHYSICAL_ALIGN
1236 default "0x04000000" if PPC_85xx
1238 This value puts the alignment restrictions on physical address
1239 where kernel is loaded and run from. Kernel is compiled for an
1240 address which meets above alignment restriction.
1242 config TASK_SIZE_BOOL
1243 bool "Set custom user task size"
1244 depends on ADVANCED_OPTIONS
1246 This option allows you to set the amount of virtual address space
1247 allocated to user tasks. This can be useful in optimizing the
1248 virtual memory layout of the system.
1250 Say N here unless you know what you are doing.
1253 hex "Size of user task space" if TASK_SIZE_BOOL
1254 default "0x80000000" if PPC_8xx
1255 default "0xb0000000" if PPC_BOOK3S_32
1256 default "0xc0000000"
1260 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1263 default "0xc000000000000000"
1266 default "0xc000000000000000"
1267 config PHYSICAL_START
1269 default "0x00000000"
1272 config PPC_LIB_RHEAP
1275 source "arch/powerpc/kvm/Kconfig"
1277 source "kernel/livepatch/Kconfig"