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_ENABLE_MEMORY_HOTPLUG
113 select ARCH_ENABLE_MEMORY_HOTREMOVE
114 select ARCH_HAS_COPY_MC if PPC64
115 select ARCH_HAS_CURRENT_STACK_POINTER
116 select ARCH_HAS_DEBUG_VIRTUAL
117 select ARCH_HAS_DEBUG_VM_PGTABLE
118 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
119 select ARCH_HAS_DEVMEM_IS_ALLOWED
120 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
121 select ARCH_HAS_ELF_RANDOMIZE
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_IPC_PARSE_VERSION
159 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
160 select ARCH_WANT_LD_ORPHAN_WARN
161 select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
162 select ARCH_WEAK_RELEASE_ACQUIRE
164 select BUILDTIME_TABLE_SORT
165 select CLONE_BACKWARDS
166 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
167 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
168 select DMA_OPS_BYPASS if PPC64
169 select DMA_OPS if PPC64
170 select DYNAMIC_FTRACE if FUNCTION_TRACER
171 select EDAC_ATOMIC_SCRUB
173 select GENERIC_ATOMIC64 if PPC32
174 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
175 select GENERIC_CMOS_UPDATE
176 select GENERIC_CPU_AUTOPROBE
177 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
178 select GENERIC_EARLY_IOREMAP
179 select GENERIC_GETTIMEOFDAY
180 select GENERIC_IRQ_SHOW
181 select GENERIC_IRQ_SHOW_LEVEL
182 select GENERIC_PCI_IOMAP if PCI
183 select GENERIC_PTDUMP
184 select GENERIC_SMP_IDLE_THREAD
185 select GENERIC_TIME_VSYSCALL
186 select GENERIC_VDSO_TIME_NS
187 select HAVE_ARCH_AUDITSYSCALL
188 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
189 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
190 select HAVE_ARCH_JUMP_LABEL
191 select HAVE_ARCH_JUMP_LABEL_RELATIVE
192 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
193 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
194 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
195 select HAVE_ARCH_KGDB
196 select HAVE_ARCH_MMAP_RND_BITS
197 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
198 select HAVE_ARCH_NVRAM_OPS
199 select HAVE_ARCH_SECCOMP_FILTER
200 select HAVE_ARCH_TRACEHOOK
201 select HAVE_ASM_MODVERSIONS
202 select HAVE_CONTEXT_TRACKING if PPC64
203 select HAVE_C_RECORDMCOUNT
204 select HAVE_DEBUG_KMEMLEAK
205 select HAVE_DEBUG_STACKOVERFLOW
206 select HAVE_DYNAMIC_FTRACE
207 select HAVE_DYNAMIC_FTRACE_WITH_ARGS if MPROFILE_KERNEL || PPC32
208 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
210 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
212 select HAVE_FTRACE_MCOUNT_RECORD
213 select HAVE_FUNCTION_DESCRIPTORS if PPC64 && !CPU_LITTLE_ENDIAN
214 select HAVE_FUNCTION_ERROR_INJECTION
215 select HAVE_FUNCTION_GRAPH_TRACER
216 select HAVE_FUNCTION_TRACER
217 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
218 select HAVE_GENERIC_VDSO
219 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
220 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
221 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
222 select HAVE_IOREMAP_PROT
223 select HAVE_IRQ_EXIT_ON_IRQ_STACK
224 select HAVE_IRQ_TIME_ACCOUNTING
225 select HAVE_KERNEL_GZIP
226 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
227 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
228 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
230 select HAVE_KPROBES_ON_FTRACE
231 select HAVE_KRETPROBES
232 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
233 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
234 select HAVE_MOD_ARCH_SPECIFIC
235 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
236 select HAVE_OPTPROBES
237 select HAVE_PERF_EVENTS
238 select HAVE_PERF_EVENTS_NMI if PPC64
239 select HAVE_PERF_REGS
240 select HAVE_PERF_USER_STACK_DUMP
241 select HAVE_REGS_AND_STACK_ACCESS_API
242 select HAVE_RELIABLE_STACKTRACE
244 select HAVE_SETUP_PER_CPU_AREA if PPC64
245 select HAVE_SOFTIRQ_ON_OWN_STACK
246 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
247 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
248 select HAVE_STATIC_CALL if PPC32
249 select HAVE_SYSCALL_TRACEPOINTS
250 select HAVE_VIRT_CPU_ACCOUNTING
251 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
252 select IOMMU_HELPER if PPC64
254 select IRQ_FORCED_THREADING
255 select MMU_GATHER_PAGE_SIZE
256 select MMU_GATHER_RCU_TABLE_FREE
257 select MODULES_USE_ELF_RELA
258 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
259 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
260 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
261 select NEED_SG_DMA_LENGTH
263 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
264 select OF_EARLY_FLATTREE
265 select OLD_SIGACTION if PPC32
266 select OLD_SIGSUSPEND
267 select PCI_DOMAINS if PCI
268 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
269 select PCI_SYSCALL if PCI
270 select PPC_DAWR if PPC64
273 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
274 select SYSCTL_EXCEPTION_TRACE
275 select THREAD_INFO_IN_TASK
276 select TRACE_IRQFLAGS_SUPPORT
277 select VIRT_TO_BUS if !PPC64
279 # Please keep this list sorted alphabetically.
282 config PPC_BARRIER_NOSPEC
285 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
296 bool "Enable support for 32bit binaries"
298 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
299 default y if !CPU_LITTLE_ENDIAN
300 select ARCH_WANT_OLD_COMPAT_IPC
301 select COMPAT_OLD_SIGACTION
303 config SYSVIPC_COMPAT
305 depends on COMPAT && SYSVIPC
308 config SCHED_OMIT_FRAME_POINTER
312 config ARCH_MAY_HAVE_PC_FDC
316 config PPC_UDBG_16550
319 config GENERIC_TBSYNC
321 default y if PPC32 && SMP
332 config GENERIC_BUG_RELATIVE_POINTERS
334 depends on GENERIC_BUG
336 config SYS_SUPPORTS_APM_EMULATION
337 default y if PMAC_APM_EMU
343 Used to allow a board to specify it wants an ePAPR compliant wrapper.
345 config DEFAULT_UIMAGE
348 Used to allow a board to specify it wants a uImage built by default
350 config ARCH_HIBERNATION_POSSIBLE
354 config ARCH_SUSPEND_POSSIBLE
356 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
357 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
360 config ARCH_SUSPEND_NONZERO_CPU
362 depends on PPC_POWERNV || PPC_PSERIES
364 config PPC_DCR_NATIVE
372 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
375 config PPC_OF_PLATFORM_PCI
378 depends on PPC64 # not supported on 32 bits yet
380 config ARCH_SUPPORTS_UPROBES
383 config PPC_ADV_DEBUG_REGS
385 depends on 40x || BOOKE
388 config PPC_ADV_DEBUG_IACS
390 depends on PPC_ADV_DEBUG_REGS
394 config PPC_ADV_DEBUG_DACS
396 depends on PPC_ADV_DEBUG_REGS
399 config PPC_ADV_DEBUG_DVCS
401 depends on PPC_ADV_DEBUG_REGS
405 config PPC_ADV_DEBUG_DAC_RANGE
407 depends on PPC_ADV_DEBUG_REGS && 44x
413 config PGTABLE_LEVELS
418 source "arch/powerpc/sysdev/Kconfig"
419 source "arch/powerpc/platforms/Kconfig"
421 menu "Kernel options"
424 bool "High memory support"
428 source "kernel/Kconfig.hz"
430 config MATH_EMULATION
431 bool "Math emulation"
432 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
435 Some PowerPC chips designed for embedded applications do not have
436 a floating-point unit and therefore do not implement the
437 floating-point instructions in the PowerPC instruction set. If you
438 say Y here, the kernel will include code to emulate a floating-point
439 unit, which will allow programs that use floating-point
442 This is also useful to emulate missing (optional) instructions
443 such as fsqrt on cores that do have an FPU but do not implement
444 them (such as Freescale BookE).
447 prompt "Math emulation options"
448 default MATH_EMULATION_FULL
449 depends on MATH_EMULATION
451 config MATH_EMULATION_FULL
452 bool "Emulate all the floating point instructions"
454 Select this option will enable the kernel to support to emulate
455 all the floating point instructions. If your SoC doesn't have
456 a FPU, you should select this.
458 config MATH_EMULATION_HW_UNIMPLEMENTED
459 bool "Just emulate the FPU unimplemented instructions"
461 Select this if you know there does have a hardware FPU on your
462 SoC, but some floating point instructions are not implemented by that.
466 config PPC_TRANSACTIONAL_MEM
467 bool "Transactional Memory support for POWERPC"
468 depends on PPC_BOOK3S_64
473 Support user-mode Transactional Memory on POWERPC.
476 bool "Ultravisor support"
477 depends on KVM_BOOK3S_HV_POSSIBLE
478 depends on DEVICE_PRIVATE
481 This option paravirtualizes the kernel to run in POWER platforms that
482 supports the Protected Execution Facility (PEF). On such platforms,
483 the ultravisor firmware runs at a privilege level above the
488 config LD_HEAD_STUB_CATCH
489 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
492 Very large kernels can cause linker branch stubs to be generated by
493 code in head_64.S, which moves the head text sections out of their
494 specified location. This option can work around the problem.
498 config MPROFILE_KERNEL
499 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
500 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
503 bool "Support for enabling/disabling CPUs"
504 depends on SMP && (PPC_PSERIES || \
505 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
507 Say Y here to be able to disable and re-enable individual
508 CPUs at runtime on SMP machines.
510 Say N if you are unsure.
512 config PPC_QUEUED_SPINLOCKS
513 bool "Queued spinlocks" if EXPERT
515 default PPC_BOOK3S_64
517 Say Y here to use queued spinlocks which give better scalability and
518 fairness on large SMP and NUMA systems without harming single threaded
521 config ARCH_CPU_PROBE_RELEASE
523 depends on HOTPLUG_CPU
525 config PPC64_SUPPORTS_MEMORY_FAILURE
526 bool "Add support for memory hwpoison"
527 depends on PPC_BOOK3S_64
528 default "y" if PPC_POWERNV
529 select ARCH_SUPPORTS_MEMORY_FAILURE
532 bool "kexec system call"
533 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
536 kexec is a system call that implements the ability to shutdown your
537 current kernel, and to start another kernel. It is like a reboot
538 but it is independent of the system firmware. And like a reboot
539 you can start any kernel with it, not just Linux.
541 The name comes from the similarity to the exec system call.
543 It is an ongoing process to be certain the hardware in a machine
544 is properly shutdown, so do not be surprised if this code does not
545 initially work for you. As of this writing the exact hardware
546 interface is strongly in flux, so no good recommendation can be
550 bool "kexec file based system call"
552 select HAVE_IMA_KEXEC if IMA
557 depends on CRYPTO_SHA256=y
559 This is a new version of the kexec system call. This call is
560 file based and takes in file descriptors as system call arguments
561 for kernel and initramfs as opposed to a list of segments as is the
562 case for the older kexec call.
564 config ARCH_HAS_KEXEC_PURGATORY
568 bool "Build a relocatable kernel"
569 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
570 select NONSTATIC_KERNEL
572 This builds a kernel image that is capable of running at the
573 location the kernel is loaded at. For ppc32, there is no any
574 alignment restrictions, and this feature is a superset of
575 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
576 16k-aligned base address. The kernel is linked as a
577 position-independent executable (PIE) and contains dynamic relocations
578 which are processed early in the bootup process.
580 One use is for the kexec on panic case where the recovery kernel
581 must live at a different physical address than the primary
584 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
585 it has been loaded at and the compile time physical addresses
586 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
587 setting can still be useful to bootwrappers that need to know the
588 load address of the kernel (eg. u-boot/mkimage).
590 config RANDOMIZE_BASE
591 bool "Randomize the address of the kernel image"
592 depends on (FSL_BOOKE && FLATMEM && PPC32)
593 depends on RELOCATABLE
595 Randomizes the virtual address at which the kernel image is
596 loaded, as a security feature that deters exploit attempts
597 relying on knowledge of the location of kernel internals.
601 config RELOCATABLE_TEST
602 bool "Test relocatable kernel"
603 depends on (PPC64 && RELOCATABLE)
605 This runs the relocatable kernel at the address it was initially
606 loaded at, which tends to be non-zero and therefore test the
610 bool "Build a dump capture kernel"
611 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
612 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
614 Build a kernel suitable for use as a dump capture kernel.
615 The same kernel binary can be used as production kernel and dump
619 bool "Firmware-assisted dump"
620 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
624 A robust mechanism to get reliable kernel crash dump with
625 assistance from firmware. This approach does not use kexec,
626 instead firmware assists in booting the capture kernel
627 while preserving memory contents. Firmware-assisted dump
628 is meant to be a kdump replacement offering robustness and
629 speed not possible without system firmware assistance.
631 If unsure, say "y". Only special kernels like petitboot may
632 need to say "N" here.
634 config PRESERVE_FA_DUMP
635 bool "Preserve Firmware-assisted dump"
636 depends on PPC64 && PPC_POWERNV && !FA_DUMP
638 On a kernel with FA_DUMP disabled, this option helps to preserve
639 crash data from a previously crash'ed kernel. Useful when the next
640 memory preserving kernel boot would process this crash data.
641 Petitboot kernel is the typical usecase for this option.
644 bool "Export OPAL memory as /sys/firmware/opal/core"
645 depends on PPC64 && PPC_POWERNV
647 This option uses the MPIPL support in firmware to provide an
648 ELF core of OPAL memory after a crash. The ELF core is exported
649 as /sys/firmware/opal/core file which is helpful in debugging
650 OPAL crashes using GDB.
653 bool "Distribute interrupts on all CPUs by default"
656 This option gives the kernel permission to distribute IRQs across
657 multiple CPUs. Saying N here will route all IRQs to the first
658 CPU. Generally saying Y is safe, although some problems have been
659 reported with SMP Power Macintoshes with this option enabled.
662 bool "NUMA Memory Allocation and Scheduler Support"
663 depends on PPC64 && SMP
664 default y if PPC_PSERIES || PPC_POWERNV
665 select USE_PERCPU_NUMA_NODE_ID
667 Enable NUMA (Non-Uniform Memory Access) support.
669 The kernel will try to allocate memory used by a CPU on the
670 local memory controller of the CPU and add some more
671 NUMA awareness to the kernel.
679 config HAVE_MEMORYLESS_NODES
683 config ARCH_SELECT_MEMORY_MODEL
687 config ARCH_FLATMEM_ENABLE
689 depends on (PPC64 && !NUMA) || PPC32
691 config ARCH_SPARSEMEM_ENABLE
694 select SPARSEMEM_VMEMMAP_ENABLE
696 config ARCH_SPARSEMEM_DEFAULT
698 depends on PPC_BOOK3S_64
700 config ILLEGAL_POINTER_VALUE
702 # This is roughly half way between the top of user space and the bottom
703 # of kernel space, which seems about as good as we can get.
704 default 0x5deadbeef0000000 if PPC64
707 config ARCH_MEMORY_PROBE
709 depends on MEMORY_HOTPLUG
713 default PPC_64K_PAGES if PPC_BOOK3S_64
716 Select the kernel logical page size. Increasing the page size
717 will reduce software overhead at each page boundary, allow
718 hardware prefetch mechanisms to be more effective, and allow
719 larger dma transfers increasing IO efficiency and reducing
720 overhead. However the utilization of memory will increase.
721 For example, each cached file will using a multiple of the
722 page size to hold its contents and the difference between the
723 end of file and the end of page is wasted.
725 Some dedicated systems, such as software raid serving with
726 accelerated calculations, have shown significant increases.
728 If you configure a 64 bit kernel for 64k pages but the
729 processor does not support them, then the kernel will simulate
730 them with 4k pages, loading them on demand, but with the
731 reduced software overhead and larger internal fragmentation.
732 For the 32 bit kernel, a large page option will not be offered
733 unless it is supported by the configured processor.
735 If unsure, choose 4K_PAGES.
739 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
743 depends on 44x || PPC_8xx
747 depends on 44x || PPC_BOOK3S_64
748 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
750 config PPC_256K_PAGES
751 bool "256k page size (Requires non-standard binutils settings)"
752 depends on 44x && !PPC_47x
754 Make the page size 256k.
756 The kernel will only be able to run applications that have been
757 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
758 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
759 definition from 0x10000 to 0x40000 in older versions.
763 config PPC_PAGE_SHIFT
765 default 18 if PPC_256K_PAGES
766 default 16 if PPC_64K_PAGES
767 default 14 if PPC_16K_PAGES
771 int "Thread shift" if EXPERT
773 default "15" if PPC_256K_PAGES
774 default "14" if PPC64
775 default "14" if KASAN
778 Used to define the stack size. The default is almost always what you
779 want. Only change this if you know what you are doing.
781 config DATA_SHIFT_BOOL
782 bool "Set custom data alignment"
783 depends on ADVANCED_OPTIONS
784 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
785 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
788 This option allows you to set the kernel data alignment. When
789 RAM is mapped by blocks, the alignment needs to fit the size and
790 number of possible blocks. The default should be OK for most configs.
792 Say N here unless you know what you are doing.
795 int "Data shift" if DATA_SHIFT_BOOL
796 default 24 if STRICT_KERNEL_RWX && PPC64
797 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
798 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
799 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
800 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
801 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
802 default 23 if STRICT_KERNEL_RWX && PPC_8xx
803 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
804 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
805 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
806 default PPC_PAGE_SHIFT
808 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
809 Smaller is the alignment, greater is the number of necessary DBATs.
811 On 8xx, large pages (512kb or 8M) are used to map kernel linear
812 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
813 in that case. If PIN_TLB is selected, it must be aligned to 8M as
814 8M pages will be pinned.
816 config FORCE_MAX_ZONEORDER
817 int "Maximum zone order"
818 range 8 9 if PPC64 && PPC_64K_PAGES
819 default "9" if PPC64 && PPC_64K_PAGES
820 range 13 13 if PPC64 && !PPC_64K_PAGES
821 default "13" if PPC64 && !PPC_64K_PAGES
822 range 9 64 if PPC32 && PPC_16K_PAGES
823 default "9" if PPC32 && PPC_16K_PAGES
824 range 7 64 if PPC32 && PPC_64K_PAGES
825 default "7" if PPC32 && PPC_64K_PAGES
826 range 5 64 if PPC32 && PPC_256K_PAGES
827 default "5" if PPC32 && PPC_256K_PAGES
831 The kernel memory allocator divides physically contiguous memory
832 blocks into "zones", where each zone is a power of two number of
833 pages. This option selects the largest power of two that the kernel
834 keeps in the memory allocator. If you need to allocate very large
835 blocks of physically contiguous memory, then you may need to
838 This config option is actually maximum order plus one. For example,
839 a value of 11 means that the largest free memory block is 2^10 pages.
841 The page size is not necessarily 4KB. For example, on 64-bit
842 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
843 this in mind when choosing a value for this option.
845 config PPC_SUBPAGE_PROT
846 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
848 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
850 This option adds support for system call to allow user programs
851 to set access permissions (read/write, readonly, or no access)
852 on the 4k subpages of each 64k page.
854 If unsure, say N here.
856 config PPC_PROT_SAO_LPAR
857 bool "Support PROT_SAO mappings in LPARs"
858 depends on PPC_BOOK3S_64
860 This option adds support for PROT_SAO mappings from userspace
861 inside LPARs on supported CPUs.
863 This may cause issues when performing guest migration from
864 a CPU that supports SAO to one that does not.
866 If unsure, say N here.
868 config PPC_COPRO_BASE
872 bool "SMT (Hyperthreading) scheduler support"
873 depends on PPC64 && SMP
875 SMT scheduler support improves the CPU scheduler's decision making
876 when dealing with POWER5 cpus at a cost of slightly increased
877 overhead in some places. If unsure say N here.
879 config PPC_DENORMALISATION
880 bool "PowerPC denormalisation exception handling"
881 depends on PPC_BOOK3S_64
882 default "y" if PPC_POWERNV
884 Add support for handling denormalisation of single precision
885 values. Useful for bare metal only. If unsure say Y here.
888 string "Initial kernel command string"
891 On some platforms, there is currently no way for the boot loader to
892 pass arguments to the kernel. For these platforms, you can supply
893 some command-line options at build time by entering them here. In
894 most cases you will need to specify the root device here.
897 prompt "Kernel command line type" if CMDLINE != ""
898 default CMDLINE_FROM_BOOTLOADER
900 config CMDLINE_FROM_BOOTLOADER
901 bool "Use bootloader kernel arguments if available"
903 Uses the command-line options passed by the boot loader. If
904 the boot loader doesn't provide any, the default kernel command
905 string provided in CMDLINE will be used.
907 config CMDLINE_EXTEND
908 bool "Extend bootloader kernel arguments"
910 The command-line arguments provided by the boot loader will be
911 appended to the default kernel command string.
914 bool "Always use the default kernel command string"
916 Always use the default kernel command string, even if the boot
917 loader passes other arguments to the kernel.
918 This is useful if you cannot or don't want to change the
919 command-line options your boot loader passes to the kernel.
924 string "Additional default image types"
926 List additional targets to be built by the bootwrapper here (separated
927 by spaces). This is useful for targets that depend of device tree
928 files in the .dts directory.
930 Targets in this list will be build as part of the default build
931 target, or when the user does a 'make zImage' or a
932 'make zImage.initrd'.
934 If unsure, leave blank
936 config ARCH_WANTS_FREEZER_CONTROL
940 source "kernel/power/Kconfig"
943 prompt "PowerPC Memory Protection Keys"
945 depends on PPC_BOOK3S_64
946 depends on PPC_64S_HASH_MMU
947 select ARCH_USES_HIGH_VMA_FLAGS
948 select ARCH_HAS_PKEYS
950 Memory Protection Keys provides a mechanism for enforcing
951 page-based protections, but without requiring modification of the
952 page tables when an application changes protection domains.
954 For details, see Documentation/core-api/protection-keys.rst
958 config PPC_SECURE_BOOT
959 prompt "Enable secure boot support"
961 depends on PPC_POWERNV || PPC_PSERIES
962 depends on IMA_ARCH_POLICY
963 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
965 Systems with firmware secure boot enabled need to define security
966 policies to extend secure boot to the OS. This config allows a user
967 to enable OS secure boot on systems that have firmware support for
968 it. If in doubt say N.
970 config PPC_SECVAR_SYSFS
971 bool "Enable sysfs interface for POWER secure variables"
973 depends on PPC_SECURE_BOOT
976 POWER secure variables are managed and controlled by firmware.
977 These variables are exposed to userspace via sysfs to enable
978 read/write operations on these variables. Say Y if you have
979 secure boot enabled and want to expose variables to userspace.
981 config PPC_RTAS_FILTER
982 bool "Enable filtering of RTAS syscalls"
986 The RTAS syscall API has security issues that could be used to
987 compromise system integrity. This option enforces restrictions on the
988 RTAS calls and arguments passed by userspace programs to mitigate
991 Say Y unless you know what you are doing and the filter is causing
1003 bool "Support for ISA-bus hardware"
1007 Find out whether you have ISA slots on your motherboard. ISA is the
1008 name of a bus system, i.e. the way the CPU talks to the other stuff
1009 inside your box. If you have an Apple machine, say N here; if you
1010 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1011 embedded board, consult your board documentation.
1013 config GENERIC_ISA_DMA
1015 depends on ISA_DMA_API
1018 config PPC_INDIRECT_PCI
1021 default y if 40x || 44x
1031 select ARCH_HAS_DMA_SET_MASK
1032 select PPC_INDIRECT_PCI
1038 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1040 Freescale MPC85xx/MPC86xx power management controller support
1041 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1046 depends on SUSPEND && (44x || 40x)
1048 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1049 It also enables support for two different idle states (idle-wait
1056 bool "Freescale Local Bus support"
1058 Enables reporting of errors from the Freescale local bus
1059 controller. Also contains some common code used by
1060 drivers for specific local bus peripherals.
1064 depends on PPC_83xx || QUICC_ENGINE || CPM2
1066 Freescale General-purpose Timers support
1070 depends on PCI && 8260
1071 select PPC_INDIRECT_PCI
1075 bool "Freescale Embedded SRIO Controller support"
1076 depends on RAPIDIO = y && HAVE_RAPIDIO
1079 Include support for RapidIO controller on Freescale embedded
1080 processors (MPC8548, MPC8641, etc).
1084 config NONSTATIC_KERNEL
1087 menu "Advanced setup"
1090 config ADVANCED_OPTIONS
1091 bool "Prompt for advanced kernel configuration options"
1093 This option will enable prompting for a variety of advanced kernel
1094 configuration options. These options can cause the kernel to not
1095 work if they are set incorrectly, but can be used to optimize certain
1096 aspects of kernel memory management.
1098 Unless you know what you are doing, say N here.
1100 comment "Default settings for advanced configuration options are used"
1101 depends on !ADVANCED_OPTIONS
1103 config LOWMEM_SIZE_BOOL
1104 bool "Set maximum low memory"
1105 depends on ADVANCED_OPTIONS
1107 This option allows you to set the maximum amount of memory which
1108 will be used as "low memory", that is, memory which the kernel can
1109 access directly, without having to set up a kernel virtual mapping.
1110 This can be useful in optimizing the layout of kernel virtual
1113 Say N here unless you know what you are doing.
1116 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1117 default "0x30000000"
1119 config LOWMEM_CAM_NUM_BOOL
1120 bool "Set number of CAMs to use to map low memory"
1121 depends on ADVANCED_OPTIONS && FSL_BOOKE
1123 This option allows you to set the maximum number of CAM slots that
1124 will be used to map low memory. There are a limited number of slots
1125 available and even more limited number that will fit in the L1 MMU.
1126 However, using more entries will allow mapping more low memory. This
1127 can be useful in optimizing the layout of kernel virtual memory.
1129 Say N here unless you know what you are doing.
1131 config LOWMEM_CAM_NUM
1132 depends on FSL_BOOKE
1133 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1134 default 3 if !STRICT_KERNEL_RWX
1135 default 9 if DATA_SHIFT >= 24
1136 default 12 if DATA_SHIFT >= 22
1139 config DYNAMIC_MEMSTART
1140 bool "Enable page aligned dynamic load address for kernel"
1141 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1142 select NONSTATIC_KERNEL
1144 This option enables the kernel to be loaded at any page aligned
1145 physical address. The kernel creates a mapping from KERNELBASE to
1146 the address where the kernel is loaded. The page size here implies
1147 the TLB page size of the mapping for kernel on the particular platform.
1148 Please refer to the init code for finding the TLB page size.
1150 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1151 kernel image, where the only restriction is the page aligned kernel
1152 load address. When this option is enabled, the compile time physical
1153 address CONFIG_PHYSICAL_START is ignored.
1155 This option is overridden by CONFIG_RELOCATABLE
1157 config PAGE_OFFSET_BOOL
1158 bool "Set custom page offset address"
1159 depends on ADVANCED_OPTIONS
1161 This option allows you to set the kernel virtual address at which
1162 the kernel will map low memory. This can be useful in optimizing
1163 the virtual memory layout of the system.
1165 Say N here unless you know what you are doing.
1168 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1169 default "0xc0000000"
1171 config KERNEL_START_BOOL
1172 bool "Set custom kernel base address"
1173 depends on ADVANCED_OPTIONS
1175 This option allows you to set the kernel virtual address at which
1176 the kernel will be loaded. Normally this should match PAGE_OFFSET
1177 however there are times (like kdump) that one might not want them
1180 Say N here unless you know what you are doing.
1183 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1184 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1185 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1186 default "0xc0000000"
1188 config PHYSICAL_START_BOOL
1189 bool "Set physical address where the kernel is loaded"
1190 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1192 This gives the physical address where the kernel is loaded.
1194 Say N here unless you know what you are doing.
1196 config PHYSICAL_START
1197 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1198 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1199 default "0x00000000"
1201 config PHYSICAL_ALIGN
1203 default "0x04000000" if FSL_BOOKE
1205 This value puts the alignment restrictions on physical address
1206 where kernel is loaded and run from. Kernel is compiled for an
1207 address which meets above alignment restriction.
1209 config TASK_SIZE_BOOL
1210 bool "Set custom user task size"
1211 depends on ADVANCED_OPTIONS
1213 This option allows you to set the amount of virtual address space
1214 allocated to user tasks. This can be useful in optimizing the
1215 virtual memory layout of the system.
1217 Say N here unless you know what you are doing.
1220 hex "Size of user task space" if TASK_SIZE_BOOL
1221 default "0x80000000" if PPC_8xx
1222 default "0xb0000000" if PPC_BOOK3S_32
1223 default "0xc0000000"
1227 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1230 default "0xc000000000000000"
1233 default "0xc000000000000000"
1234 config PHYSICAL_START
1236 default "0x00000000"
1242 config PPC_LIB_RHEAP
1245 source "arch/powerpc/kvm/Kconfig"
1247 source "kernel/livepatch/Kconfig"