1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
63 int "Number of virtual interrupt numbers"
67 This defines the number of virtual interrupt numbers the kernel
68 can manage. Virtual interrupt numbers are what you see in
69 /proc/interrupts. If you configure your system to have too few,
70 drivers will fail to load or worse - handle with care.
74 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
79 depends on HARDLOCKUP_DETECTOR
80 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
83 This is a placeholder when the powerpc hardlockup detector
84 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
85 selected via the generic lockup detector menu which is why we
86 have no standalone config option for it here.
88 config STACKTRACE_SUPPORT
92 config LOCKDEP_SUPPORT
96 config GENERIC_LOCKBREAK
99 depends on SMP && PREEMPTION
101 config GENERIC_HWEIGHT
109 # Please keep this list sorted alphabetically.
111 select ARCH_32BIT_OFF_T if PPC32
112 select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
113 select ARCH_ENABLE_MEMORY_HOTPLUG
114 select ARCH_ENABLE_MEMORY_HOTREMOVE
115 select ARCH_HAS_COPY_MC if PPC64
116 select ARCH_HAS_CURRENT_STACK_POINTER
117 select ARCH_HAS_DEBUG_VIRTUAL
118 select ARCH_HAS_DEBUG_VM_PGTABLE
119 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
120 select ARCH_HAS_DEVMEM_IS_ALLOWED
121 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
122 select ARCH_HAS_FORTIFY_SOURCE
123 select ARCH_HAS_GCOV_PROFILE_ALL
124 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
126 select ARCH_HAS_MEMBARRIER_CALLBACKS
127 select ARCH_HAS_MEMBARRIER_SYNC_CORE
128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
131 select ARCH_HAS_PHYS_TO_DMA
132 select ARCH_HAS_PMEM_API
133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
134 select ARCH_HAS_PTE_SPECIAL
135 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
136 select ARCH_HAS_SET_MEMORY
137 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
138 select ARCH_HAS_STRICT_KERNEL_RWX if FSL_BOOKE && !HIBERNATION && !RANDOMIZE_BASE
139 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
140 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
141 select ARCH_HAS_UACCESS_FLUSHCACHE
142 select ARCH_HAS_UBSAN_SANITIZE_ALL
143 select ARCH_HAS_VM_GET_PAGE_PROT if PPC_BOOK3S_64
144 select ARCH_HAVE_NMI_SAFE_CMPXCHG
145 select ARCH_KEEP_MEMBLOCK
146 select ARCH_MIGHT_HAVE_PC_PARPORT
147 select ARCH_MIGHT_HAVE_PC_SERIO
148 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
149 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
150 select ARCH_STACKWALK
151 select ARCH_SUPPORTS_ATOMIC_RMW
152 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
153 select ARCH_USE_BUILTIN_BSWAP
154 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
155 select ARCH_USE_MEMTEST
156 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
157 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
158 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
159 select ARCH_WANT_IPC_PARSE_VERSION
160 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
161 select ARCH_WANT_LD_ORPHAN_WARN
162 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
163 select ARCH_WANTS_NO_INSTR
164 select ARCH_WEAK_RELEASE_ACQUIRE
166 select BUILDTIME_TABLE_SORT
167 select CLONE_BACKWARDS
168 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
169 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
170 select DMA_OPS_BYPASS if PPC64
171 select DMA_OPS if PPC64
172 select DYNAMIC_FTRACE if FUNCTION_TRACER
173 select EDAC_ATOMIC_SCRUB
175 select GENERIC_ATOMIC64 if PPC32
176 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
177 select GENERIC_CMOS_UPDATE
178 select GENERIC_CPU_AUTOPROBE
179 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
180 select GENERIC_EARLY_IOREMAP
181 select GENERIC_GETTIMEOFDAY
182 select GENERIC_IRQ_SHOW
183 select GENERIC_IRQ_SHOW_LEVEL
184 select GENERIC_PCI_IOMAP if PCI
185 select GENERIC_PTDUMP
186 select GENERIC_SMP_IDLE_THREAD
187 select GENERIC_TIME_VSYSCALL
188 select GENERIC_VDSO_TIME_NS
189 select HAVE_ARCH_AUDITSYSCALL
190 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
191 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
192 select HAVE_ARCH_JUMP_LABEL
193 select HAVE_ARCH_JUMP_LABEL_RELATIVE
194 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
195 select HAVE_ARCH_KASAN if PPC_RADIX_MMU
196 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
197 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
198 select HAVE_ARCH_KGDB
199 select HAVE_ARCH_MMAP_RND_BITS
200 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
201 select HAVE_ARCH_NVRAM_OPS
202 select HAVE_ARCH_SECCOMP_FILTER
203 select HAVE_ARCH_TRACEHOOK
204 select HAVE_ASM_MODVERSIONS
205 select HAVE_CONTEXT_TRACKING if PPC64
206 select HAVE_C_RECORDMCOUNT
207 select HAVE_DEBUG_KMEMLEAK
208 select HAVE_DEBUG_STACKOVERFLOW
209 select HAVE_DYNAMIC_FTRACE
210 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
211 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
213 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
215 select HAVE_FTRACE_MCOUNT_RECORD
216 select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
217 select HAVE_FUNCTION_ERROR_INJECTION
218 select HAVE_FUNCTION_GRAPH_TRACER
219 select HAVE_FUNCTION_TRACER
220 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
221 select HAVE_GENERIC_VDSO
222 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
223 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
224 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
225 select HAVE_IOREMAP_PROT
226 select HAVE_IRQ_TIME_ACCOUNTING
227 select HAVE_KERNEL_GZIP
228 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
229 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
230 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
232 select HAVE_KPROBES_ON_FTRACE
233 select HAVE_KRETPROBES
234 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
235 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
236 select HAVE_MOD_ARCH_SPECIFIC
237 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
238 select HAVE_OPTPROBES
239 select HAVE_PERF_EVENTS
240 select HAVE_PERF_EVENTS_NMI if PPC64
241 select HAVE_PERF_REGS
242 select HAVE_PERF_USER_STACK_DUMP
243 select HAVE_REGS_AND_STACK_ACCESS_API
244 select HAVE_RELIABLE_STACKTRACE
246 select HAVE_SETUP_PER_CPU_AREA if PPC64
247 select HAVE_SOFTIRQ_ON_OWN_STACK
248 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
249 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
250 select HAVE_STATIC_CALL if PPC32
251 select HAVE_SYSCALL_TRACEPOINTS
252 select HAVE_VIRT_CPU_ACCOUNTING
253 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
254 select IOMMU_HELPER if PPC64
256 select IRQ_FORCED_THREADING
257 select MMU_GATHER_PAGE_SIZE
258 select MMU_GATHER_RCU_TABLE_FREE
259 select MMU_GATHER_MERGE_VMAS
260 select MODULES_USE_ELF_RELA
261 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
262 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
263 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
264 select NEED_SG_DMA_LENGTH
266 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
267 select OF_EARLY_FLATTREE
268 select OLD_SIGACTION if PPC32
269 select OLD_SIGSUSPEND
270 select PCI_DOMAINS if PCI
271 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
272 select PCI_SYSCALL if PCI
273 select PPC_DAWR if PPC64
276 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
277 select SYSCTL_EXCEPTION_TRACE
278 select THREAD_INFO_IN_TASK
279 select TRACE_IRQFLAGS_SUPPORT
280 select VIRT_TO_BUS if !PPC64
282 # Please keep this list sorted alphabetically.
285 config PPC_LONG_DOUBLE_128
287 def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
289 config PPC_BARRIER_NOSPEC
292 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
303 bool "Enable support for 32bit binaries"
305 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
306 default y if !CPU_LITTLE_ENDIAN
307 select ARCH_WANT_OLD_COMPAT_IPC
308 select COMPAT_OLD_SIGACTION
310 config SCHED_OMIT_FRAME_POINTER
314 config ARCH_MAY_HAVE_PC_FDC
318 config PPC_UDBG_16550
321 config GENERIC_TBSYNC
323 default y if PPC32 && SMP
334 config GENERIC_BUG_RELATIVE_POINTERS
336 depends on GENERIC_BUG
338 config SYS_SUPPORTS_APM_EMULATION
339 default y if PMAC_APM_EMU
345 Used to allow a board to specify it wants an ePAPR compliant wrapper.
347 config DEFAULT_UIMAGE
350 Used to allow a board to specify it wants a uImage built by default
352 config ARCH_HIBERNATION_POSSIBLE
356 config ARCH_SUSPEND_POSSIBLE
358 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
359 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
362 config ARCH_SUSPEND_NONZERO_CPU
364 depends on PPC_POWERNV || PPC_PSERIES
366 config ARCH_HAS_ADD_PAGES
368 depends on ARCH_ENABLE_MEMORY_HOTPLUG
370 config PPC_DCR_NATIVE
378 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
381 config PPC_OF_PLATFORM_PCI
384 depends on PPC64 # not supported on 32 bits yet
386 config ARCH_SUPPORTS_UPROBES
389 config PPC_ADV_DEBUG_REGS
391 depends on 40x || BOOKE
394 config PPC_ADV_DEBUG_IACS
396 depends on PPC_ADV_DEBUG_REGS
400 config PPC_ADV_DEBUG_DACS
402 depends on PPC_ADV_DEBUG_REGS
405 config PPC_ADV_DEBUG_DVCS
407 depends on PPC_ADV_DEBUG_REGS
411 config PPC_ADV_DEBUG_DAC_RANGE
413 depends on PPC_ADV_DEBUG_REGS && 44x
419 config PGTABLE_LEVELS
424 source "arch/powerpc/sysdev/Kconfig"
425 source "arch/powerpc/platforms/Kconfig"
427 menu "Kernel options"
430 bool "High memory support"
434 source "kernel/Kconfig.hz"
436 config MATH_EMULATION
437 bool "Math emulation"
438 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
441 Some PowerPC chips designed for embedded applications do not have
442 a floating-point unit and therefore do not implement the
443 floating-point instructions in the PowerPC instruction set. If you
444 say Y here, the kernel will include code to emulate a floating-point
445 unit, which will allow programs that use floating-point
448 This is also useful to emulate missing (optional) instructions
449 such as fsqrt on cores that do have an FPU but do not implement
450 them (such as Freescale BookE).
453 prompt "Math emulation options"
454 default MATH_EMULATION_FULL
455 depends on MATH_EMULATION
457 config MATH_EMULATION_FULL
458 bool "Emulate all the floating point instructions"
460 Select this option will enable the kernel to support to emulate
461 all the floating point instructions. If your SoC doesn't have
462 a FPU, you should select this.
464 config MATH_EMULATION_HW_UNIMPLEMENTED
465 bool "Just emulate the FPU unimplemented instructions"
467 Select this if you know there does have a hardware FPU on your
468 SoC, but some floating point instructions are not implemented by that.
472 config PPC_TRANSACTIONAL_MEM
473 bool "Transactional Memory support for POWERPC"
474 depends on PPC_BOOK3S_64
479 Support user-mode Transactional Memory on POWERPC.
482 bool "Ultravisor support"
483 depends on KVM_BOOK3S_HV_POSSIBLE
484 depends on DEVICE_PRIVATE
487 This option paravirtualizes the kernel to run in POWER platforms that
488 supports the Protected Execution Facility (PEF). On such platforms,
489 the ultravisor firmware runs at a privilege level above the
494 config LD_HEAD_STUB_CATCH
495 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
498 Very large kernels can cause linker branch stubs to be generated by
499 code in head_64.S, which moves the head text sections out of their
500 specified location. This option can work around the problem.
504 config MPROFILE_KERNEL
505 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
506 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
509 bool "Support for enabling/disabling CPUs"
510 depends on SMP && (PPC_PSERIES || \
511 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
513 Say Y here to be able to disable and re-enable individual
514 CPUs at runtime on SMP machines.
516 Say N if you are unsure.
518 config PPC_QUEUED_SPINLOCKS
519 bool "Queued spinlocks" if EXPERT
521 default PPC_BOOK3S_64
523 Say Y here to use queued spinlocks which give better scalability and
524 fairness on large SMP and NUMA systems without harming single threaded
527 config ARCH_CPU_PROBE_RELEASE
529 depends on HOTPLUG_CPU
531 config PPC64_SUPPORTS_MEMORY_FAILURE
532 bool "Add support for memory hwpoison"
533 depends on PPC_BOOK3S_64
534 default "y" if PPC_POWERNV
535 select ARCH_SUPPORTS_MEMORY_FAILURE
538 bool "kexec system call"
539 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
542 kexec is a system call that implements the ability to shutdown your
543 current kernel, and to start another kernel. It is like a reboot
544 but it is independent of the system firmware. And like a reboot
545 you can start any kernel with it, not just Linux.
547 The name comes from the similarity to the exec system call.
549 It is an ongoing process to be certain the hardware in a machine
550 is properly shutdown, so do not be surprised if this code does not
551 initially work for you. As of this writing the exact hardware
552 interface is strongly in flux, so no good recommendation can be
556 bool "kexec file based system call"
558 select HAVE_IMA_KEXEC if IMA
563 depends on CRYPTO_SHA256=y
565 This is a new version of the kexec system call. This call is
566 file based and takes in file descriptors as system call arguments
567 for kernel and initramfs as opposed to a list of segments as is the
568 case for the older kexec call.
570 config ARCH_HAS_KEXEC_PURGATORY
574 bool "Build a relocatable kernel"
575 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
576 select NONSTATIC_KERNEL
578 This builds a kernel image that is capable of running at the
579 location the kernel is loaded at. For ppc32, there is no any
580 alignment restrictions, and this feature is a superset of
581 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
582 16k-aligned base address. The kernel is linked as a
583 position-independent executable (PIE) and contains dynamic relocations
584 which are processed early in the bootup process.
586 One use is for the kexec on panic case where the recovery kernel
587 must live at a different physical address than the primary
590 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
591 it has been loaded at and the compile time physical addresses
592 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
593 setting can still be useful to bootwrappers that need to know the
594 load address of the kernel (eg. u-boot/mkimage).
596 config RANDOMIZE_BASE
597 bool "Randomize the address of the kernel image"
598 depends on (FSL_BOOKE && FLATMEM && PPC32)
599 depends on RELOCATABLE
601 Randomizes the virtual address at which the kernel image is
602 loaded, as a security feature that deters exploit attempts
603 relying on knowledge of the location of kernel internals.
607 config RELOCATABLE_TEST
608 bool "Test relocatable kernel"
609 depends on (PPC64 && RELOCATABLE)
611 This runs the relocatable kernel at the address it was initially
612 loaded at, which tends to be non-zero and therefore test the
616 bool "Build a dump capture kernel"
617 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
618 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
620 Build a kernel suitable for use as a dump capture kernel.
621 The same kernel binary can be used as production kernel and dump
625 bool "Firmware-assisted dump"
626 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
630 A robust mechanism to get reliable kernel crash dump with
631 assistance from firmware. This approach does not use kexec,
632 instead firmware assists in booting the capture kernel
633 while preserving memory contents. Firmware-assisted dump
634 is meant to be a kdump replacement offering robustness and
635 speed not possible without system firmware assistance.
637 If unsure, say "y". Only special kernels like petitboot may
638 need to say "N" here.
640 config PRESERVE_FA_DUMP
641 bool "Preserve Firmware-assisted dump"
642 depends on PPC64 && PPC_POWERNV && !FA_DUMP
644 On a kernel with FA_DUMP disabled, this option helps to preserve
645 crash data from a previously crash'ed kernel. Useful when the next
646 memory preserving kernel boot would process this crash data.
647 Petitboot kernel is the typical usecase for this option.
650 bool "Export OPAL memory as /sys/firmware/opal/core"
651 depends on PPC64 && PPC_POWERNV
653 This option uses the MPIPL support in firmware to provide an
654 ELF core of OPAL memory after a crash. The ELF core is exported
655 as /sys/firmware/opal/core file which is helpful in debugging
656 OPAL crashes using GDB.
659 bool "Distribute interrupts on all CPUs by default"
662 This option gives the kernel permission to distribute IRQs across
663 multiple CPUs. Saying N here will route all IRQs to the first
664 CPU. Generally saying Y is safe, although some problems have been
665 reported with SMP Power Macintoshes with this option enabled.
668 bool "NUMA Memory Allocation and Scheduler Support"
669 depends on PPC64 && SMP
670 default y if PPC_PSERIES || PPC_POWERNV
671 select USE_PERCPU_NUMA_NODE_ID
673 Enable NUMA (Non-Uniform Memory Access) support.
675 The kernel will try to allocate memory used by a CPU on the
676 local memory controller of the CPU and add some more
677 NUMA awareness to the kernel.
685 config HAVE_MEMORYLESS_NODES
689 config ARCH_SELECT_MEMORY_MODEL
693 config ARCH_FLATMEM_ENABLE
695 depends on (PPC64 && !NUMA) || PPC32
697 config ARCH_SPARSEMEM_ENABLE
700 select SPARSEMEM_VMEMMAP_ENABLE
702 config ARCH_SPARSEMEM_DEFAULT
704 depends on PPC_BOOK3S_64
706 config ILLEGAL_POINTER_VALUE
708 # This is roughly half way between the top of user space and the bottom
709 # of kernel space, which seems about as good as we can get.
710 default 0x5deadbeef0000000 if PPC64
713 config ARCH_MEMORY_PROBE
715 depends on MEMORY_HOTPLUG
719 default PPC_64K_PAGES if PPC_BOOK3S_64
722 Select the kernel logical page size. Increasing the page size
723 will reduce software overhead at each page boundary, allow
724 hardware prefetch mechanisms to be more effective, and allow
725 larger dma transfers increasing IO efficiency and reducing
726 overhead. However the utilization of memory will increase.
727 For example, each cached file will using a multiple of the
728 page size to hold its contents and the difference between the
729 end of file and the end of page is wasted.
731 Some dedicated systems, such as software raid serving with
732 accelerated calculations, have shown significant increases.
734 If you configure a 64 bit kernel for 64k pages but the
735 processor does not support them, then the kernel will simulate
736 them with 4k pages, loading them on demand, but with the
737 reduced software overhead and larger internal fragmentation.
738 For the 32 bit kernel, a large page option will not be offered
739 unless it is supported by the configured processor.
741 If unsure, choose 4K_PAGES.
745 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
749 depends on 44x || PPC_8xx
753 depends on 44x || PPC_BOOK3S_64
754 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
756 config PPC_256K_PAGES
757 bool "256k page size (Requires non-standard binutils settings)"
758 depends on 44x && !PPC_47x
760 Make the page size 256k.
762 The kernel will only be able to run applications that have been
763 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
764 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
765 definition from 0x10000 to 0x40000 in older versions.
771 depends on PPC_4K_PAGES
773 config PAGE_SIZE_16KB
775 depends on PPC_16K_PAGES
777 config PAGE_SIZE_64KB
779 depends on PPC_64K_PAGES
781 config PAGE_SIZE_256KB
783 depends on PPC_256K_PAGES
785 config PPC_PAGE_SHIFT
787 default 18 if PPC_256K_PAGES
788 default 16 if PPC_64K_PAGES
789 default 14 if PPC_16K_PAGES
793 int "Thread shift" if EXPERT
795 default "15" if PPC_256K_PAGES
796 default "14" if PPC64
799 Used to define the stack size. The default is almost always what you
800 want. Only change this if you know what you are doing.
802 config DATA_SHIFT_BOOL
803 bool "Set custom data alignment"
804 depends on ADVANCED_OPTIONS
805 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
806 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
809 This option allows you to set the kernel data alignment. When
810 RAM is mapped by blocks, the alignment needs to fit the size and
811 number of possible blocks. The default should be OK for most configs.
813 Say N here unless you know what you are doing.
816 int "Data shift" if DATA_SHIFT_BOOL
817 default 24 if STRICT_KERNEL_RWX && PPC64
818 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
819 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
820 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
821 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
822 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
823 default 23 if STRICT_KERNEL_RWX && PPC_8xx
824 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
825 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
826 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
827 default PPC_PAGE_SHIFT
829 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
830 Smaller is the alignment, greater is the number of necessary DBATs.
832 On 8xx, large pages (512kb or 8M) are used to map kernel linear
833 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
834 in that case. If PIN_TLB is selected, it must be aligned to 8M as
835 8M pages will be pinned.
837 config FORCE_MAX_ZONEORDER
838 int "Maximum zone order"
839 range 8 9 if PPC64 && PPC_64K_PAGES
840 default "9" if PPC64 && PPC_64K_PAGES
841 range 13 13 if PPC64 && !PPC_64K_PAGES
842 default "13" if PPC64 && !PPC_64K_PAGES
843 range 9 64 if PPC32 && PPC_16K_PAGES
844 default "9" if PPC32 && PPC_16K_PAGES
845 range 7 64 if PPC32 && PPC_64K_PAGES
846 default "7" if PPC32 && PPC_64K_PAGES
847 range 5 64 if PPC32 && PPC_256K_PAGES
848 default "5" if PPC32 && PPC_256K_PAGES
852 The kernel memory allocator divides physically contiguous memory
853 blocks into "zones", where each zone is a power of two number of
854 pages. This option selects the largest power of two that the kernel
855 keeps in the memory allocator. If you need to allocate very large
856 blocks of physically contiguous memory, then you may need to
859 This config option is actually maximum order plus one. For example,
860 a value of 11 means that the largest free memory block is 2^10 pages.
862 The page size is not necessarily 4KB. For example, on 64-bit
863 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
864 this in mind when choosing a value for this option.
866 config PPC_SUBPAGE_PROT
867 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
869 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
871 This option adds support for system call to allow user programs
872 to set access permissions (read/write, readonly, or no access)
873 on the 4k subpages of each 64k page.
875 If unsure, say N here.
877 config PPC_PROT_SAO_LPAR
878 bool "Support PROT_SAO mappings in LPARs"
879 depends on PPC_BOOK3S_64
881 This option adds support for PROT_SAO mappings from userspace
882 inside LPARs on supported CPUs.
884 This may cause issues when performing guest migration from
885 a CPU that supports SAO to one that does not.
887 If unsure, say N here.
889 config PPC_COPRO_BASE
893 bool "SMT (Hyperthreading) scheduler support"
894 depends on PPC64 && SMP
896 SMT scheduler support improves the CPU scheduler's decision making
897 when dealing with POWER5 cpus at a cost of slightly increased
898 overhead in some places. If unsure say N here.
900 config PPC_DENORMALISATION
901 bool "PowerPC denormalisation exception handling"
902 depends on PPC_BOOK3S_64
903 default "y" if PPC_POWERNV
905 Add support for handling denormalisation of single precision
906 values. Useful for bare metal only. If unsure say Y here.
909 string "Initial kernel command string"
912 On some platforms, there is currently no way for the boot loader to
913 pass arguments to the kernel. For these platforms, you can supply
914 some command-line options at build time by entering them here. In
915 most cases you will need to specify the root device here.
918 prompt "Kernel command line type" if CMDLINE != ""
919 default CMDLINE_FROM_BOOTLOADER
921 config CMDLINE_FROM_BOOTLOADER
922 bool "Use bootloader kernel arguments if available"
924 Uses the command-line options passed by the boot loader. If
925 the boot loader doesn't provide any, the default kernel command
926 string provided in CMDLINE will be used.
928 config CMDLINE_EXTEND
929 bool "Extend bootloader kernel arguments"
931 The command-line arguments provided by the boot loader will be
932 appended to the default kernel command string.
935 bool "Always use the default kernel command string"
937 Always use the default kernel command string, even if the boot
938 loader passes other arguments to the kernel.
939 This is useful if you cannot or don't want to change the
940 command-line options your boot loader passes to the kernel.
945 string "Additional default image types"
947 List additional targets to be built by the bootwrapper here (separated
948 by spaces). This is useful for targets that depend of device tree
949 files in the .dts directory.
951 Targets in this list will be build as part of the default build
952 target, or when the user does a 'make zImage' or a
953 'make zImage.initrd'.
955 If unsure, leave blank
957 config ARCH_WANTS_FREEZER_CONTROL
961 source "kernel/power/Kconfig"
964 prompt "PowerPC Memory Protection Keys"
966 depends on PPC_BOOK3S_64
967 depends on PPC_64S_HASH_MMU
968 select ARCH_USES_HIGH_VMA_FLAGS
969 select ARCH_HAS_PKEYS
971 Memory Protection Keys provides a mechanism for enforcing
972 page-based protections, but without requiring modification of the
973 page tables when an application changes protection domains.
975 For details, see Documentation/core-api/protection-keys.rst
979 config PPC_SECURE_BOOT
980 prompt "Enable secure boot support"
982 depends on PPC_POWERNV || PPC_PSERIES
983 depends on IMA_ARCH_POLICY
984 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
986 Systems with firmware secure boot enabled need to define security
987 policies to extend secure boot to the OS. This config allows a user
988 to enable OS secure boot on systems that have firmware support for
989 it. If in doubt say N.
991 config PPC_SECVAR_SYSFS
992 bool "Enable sysfs interface for POWER secure variables"
994 depends on PPC_SECURE_BOOT
997 POWER secure variables are managed and controlled by firmware.
998 These variables are exposed to userspace via sysfs to enable
999 read/write operations on these variables. Say Y if you have
1000 secure boot enabled and want to expose variables to userspace.
1002 config PPC_RTAS_FILTER
1003 bool "Enable filtering of RTAS syscalls"
1007 The RTAS syscall API has security issues that could be used to
1008 compromise system integrity. This option enforces restrictions on the
1009 RTAS calls and arguments passed by userspace programs to mitigate
1012 Say Y unless you know what you are doing and the filter is causing
1024 bool "Support for ISA-bus hardware"
1028 Find out whether you have ISA slots on your motherboard. ISA is the
1029 name of a bus system, i.e. the way the CPU talks to the other stuff
1030 inside your box. If you have an Apple machine, say N here; if you
1031 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1032 embedded board, consult your board documentation.
1034 config GENERIC_ISA_DMA
1036 depends on ISA_DMA_API
1039 config PPC_INDIRECT_PCI
1042 default y if 40x || 44x
1052 select ARCH_HAS_DMA_SET_MASK
1053 select PPC_INDIRECT_PCI
1059 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1061 Freescale MPC85xx/MPC86xx power management controller support
1062 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1067 depends on SUSPEND && (44x || 40x)
1069 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1070 It also enables support for two different idle states (idle-wait
1077 bool "Freescale Local Bus support"
1079 Enables reporting of errors from the Freescale local bus
1080 controller. Also contains some common code used by
1081 drivers for specific local bus peripherals.
1085 depends on PPC_83xx || QUICC_ENGINE || CPM2
1087 Freescale General-purpose Timers support
1091 depends on PCI && 8260
1092 select PPC_INDIRECT_PCI
1096 bool "Freescale Embedded SRIO Controller support"
1097 depends on RAPIDIO = y && HAVE_RAPIDIO
1100 Include support for RapidIO controller on Freescale embedded
1101 processors (MPC8548, MPC8641, etc).
1105 config NONSTATIC_KERNEL
1108 menu "Advanced setup"
1111 config ADVANCED_OPTIONS
1112 bool "Prompt for advanced kernel configuration options"
1114 This option will enable prompting for a variety of advanced kernel
1115 configuration options. These options can cause the kernel to not
1116 work if they are set incorrectly, but can be used to optimize certain
1117 aspects of kernel memory management.
1119 Unless you know what you are doing, say N here.
1121 comment "Default settings for advanced configuration options are used"
1122 depends on !ADVANCED_OPTIONS
1124 config LOWMEM_SIZE_BOOL
1125 bool "Set maximum low memory"
1126 depends on ADVANCED_OPTIONS
1128 This option allows you to set the maximum amount of memory which
1129 will be used as "low memory", that is, memory which the kernel can
1130 access directly, without having to set up a kernel virtual mapping.
1131 This can be useful in optimizing the layout of kernel virtual
1134 Say N here unless you know what you are doing.
1137 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1138 default "0x30000000"
1140 config LOWMEM_CAM_NUM_BOOL
1141 bool "Set number of CAMs to use to map low memory"
1142 depends on ADVANCED_OPTIONS && FSL_BOOKE
1144 This option allows you to set the maximum number of CAM slots that
1145 will be used to map low memory. There are a limited number of slots
1146 available and even more limited number that will fit in the L1 MMU.
1147 However, using more entries will allow mapping more low memory. This
1148 can be useful in optimizing the layout of kernel virtual memory.
1150 Say N here unless you know what you are doing.
1152 config LOWMEM_CAM_NUM
1153 depends on FSL_BOOKE
1154 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1155 default 3 if !STRICT_KERNEL_RWX
1156 default 9 if DATA_SHIFT >= 24
1157 default 12 if DATA_SHIFT >= 22
1160 config DYNAMIC_MEMSTART
1161 bool "Enable page aligned dynamic load address for kernel"
1162 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1163 select NONSTATIC_KERNEL
1165 This option enables the kernel to be loaded at any page aligned
1166 physical address. The kernel creates a mapping from KERNELBASE to
1167 the address where the kernel is loaded. The page size here implies
1168 the TLB page size of the mapping for kernel on the particular platform.
1169 Please refer to the init code for finding the TLB page size.
1171 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1172 kernel image, where the only restriction is the page aligned kernel
1173 load address. When this option is enabled, the compile time physical
1174 address CONFIG_PHYSICAL_START is ignored.
1176 This option is overridden by CONFIG_RELOCATABLE
1178 config PAGE_OFFSET_BOOL
1179 bool "Set custom page offset address"
1180 depends on ADVANCED_OPTIONS
1182 This option allows you to set the kernel virtual address at which
1183 the kernel will map low memory. This can be useful in optimizing
1184 the virtual memory layout of the system.
1186 Say N here unless you know what you are doing.
1189 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1190 default "0xc0000000"
1192 config KERNEL_START_BOOL
1193 bool "Set custom kernel base address"
1194 depends on ADVANCED_OPTIONS
1196 This option allows you to set the kernel virtual address at which
1197 the kernel will be loaded. Normally this should match PAGE_OFFSET
1198 however there are times (like kdump) that one might not want them
1201 Say N here unless you know what you are doing.
1204 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1205 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1206 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1207 default "0xc0000000"
1209 config PHYSICAL_START_BOOL
1210 bool "Set physical address where the kernel is loaded"
1211 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1213 This gives the physical address where the kernel is loaded.
1215 Say N here unless you know what you are doing.
1217 config PHYSICAL_START
1218 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1219 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1220 default "0x00000000"
1222 config PHYSICAL_ALIGN
1224 default "0x04000000" if FSL_BOOKE
1226 This value puts the alignment restrictions on physical address
1227 where kernel is loaded and run from. Kernel is compiled for an
1228 address which meets above alignment restriction.
1230 config TASK_SIZE_BOOL
1231 bool "Set custom user task size"
1232 depends on ADVANCED_OPTIONS
1234 This option allows you to set the amount of virtual address space
1235 allocated to user tasks. This can be useful in optimizing the
1236 virtual memory layout of the system.
1238 Say N here unless you know what you are doing.
1241 hex "Size of user task space" if TASK_SIZE_BOOL
1242 default "0x80000000" if PPC_8xx
1243 default "0xb0000000" if PPC_BOOK3S_32
1244 default "0xc0000000"
1248 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1251 default "0xc000000000000000"
1254 default "0xc000000000000000"
1255 config PHYSICAL_START
1257 default "0x00000000"
1263 config PPC_LIB_RHEAP
1266 source "arch/powerpc/kvm/Kconfig"
1268 source "kernel/livepatch/Kconfig"