1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
16 config ARCH_MMAP_RND_BITS_MAX
17 # On Book3S 64, the default virtual address space for 64-bit processes
18 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
19 # 32T of address space (2^45), which should ensure a reasonable gap
20 # between bottom-up and top-down allocations for applications that
21 # consume "normal" amounts of address space. Book3S 64 only supports 64K
23 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
24 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
26 # On all other 64-bit platforms (currently only Book3E), the virtual
27 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
28 # of address space (2^44). Only 4K page sizes are supported.
29 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
31 # For 32-bit, use the compat values, as they're the same.
32 default ARCH_MMAP_RND_COMPAT_BITS_MAX
34 config ARCH_MMAP_RND_BITS_MIN
35 # Allow randomisation to consume up to 1GB of address space (2^30).
36 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
37 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
39 # For 32-bit, use the compat values, as they're the same.
40 default ARCH_MMAP_RND_COMPAT_BITS_MIN
42 config ARCH_MMAP_RND_COMPAT_BITS_MAX
43 # Total virtual address space for 32-bit processes is 2^31 (2GB).
44 # Allow randomisation to consume up to 512MB of address space (2^29).
45 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
46 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
47 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
48 default 17 # 17 = 29 (512MB) - 12 (4K)
50 config ARCH_MMAP_RND_COMPAT_BITS_MIN
51 # Total virtual address space for 32-bit processes is 2^31 (2GB).
52 # Allow randomisation to consume up to 8MB of address space (2^23).
53 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
54 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
55 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
56 default 11 # 11 = 23 (8MB) - 12 (4K)
59 int "Number of virtual interrupt numbers"
63 This defines the number of virtual interrupt numbers the kernel
64 can manage. Virtual interrupt numbers are what you see in
65 /proc/interrupts. If you configure your system to have too few,
66 drivers will fail to load or worse - handle with care.
70 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
75 depends on HARDLOCKUP_DETECTOR
76 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
79 This is a placeholder when the powerpc hardlockup detector
80 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
81 selected via the generic lockup detector menu which is why we
82 have no standalone config option for it here.
84 config STACKTRACE_SUPPORT
88 config LOCKDEP_SUPPORT
92 config GENERIC_LOCKBREAK
95 depends on SMP && PREEMPTION
97 config GENERIC_HWEIGHT
105 # Please keep this list sorted alphabetically.
107 select ARCH_32BIT_OFF_T if PPC32
108 select ARCH_ENABLE_MEMORY_HOTPLUG
109 select ARCH_ENABLE_MEMORY_HOTREMOVE
110 select ARCH_HAS_COPY_MC if PPC64
111 select ARCH_HAS_CURRENT_STACK_POINTER
112 select ARCH_HAS_DEBUG_VIRTUAL
113 select ARCH_HAS_DEBUG_VM_PGTABLE
114 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
115 select ARCH_HAS_DEVMEM_IS_ALLOWED
116 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
117 select ARCH_HAS_ELF_RANDOMIZE
118 select ARCH_HAS_FORTIFY_SOURCE
119 select ARCH_HAS_GCOV_PROFILE_ALL
120 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
122 select ARCH_HAS_MEMBARRIER_CALLBACKS
123 select ARCH_HAS_MEMBARRIER_SYNC_CORE
124 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
125 select ARCH_HAS_MMIOWB if PPC64
126 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
127 select ARCH_HAS_PHYS_TO_DMA
128 select ARCH_HAS_PMEM_API
129 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
130 select ARCH_HAS_PTE_SPECIAL
131 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
132 select ARCH_HAS_SET_MEMORY
133 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
134 select ARCH_HAS_STRICT_KERNEL_RWX if FSL_BOOKE && !HIBERNATION && !RANDOMIZE_BASE
135 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX && !PPC_BOOK3S_32
136 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
137 select ARCH_HAS_UACCESS_FLUSHCACHE
138 select ARCH_HAS_UBSAN_SANITIZE_ALL
139 select ARCH_HAVE_NMI_SAFE_CMPXCHG
140 select ARCH_KEEP_MEMBLOCK
141 select ARCH_MIGHT_HAVE_PC_PARPORT
142 select ARCH_MIGHT_HAVE_PC_SERIO
143 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
144 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
145 select ARCH_STACKWALK
146 select ARCH_SUPPORTS_ATOMIC_RMW
147 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
148 select ARCH_USE_BUILTIN_BSWAP
149 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
150 select ARCH_USE_MEMTEST
151 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
152 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
153 select ARCH_WANT_IPC_PARSE_VERSION
154 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
155 select ARCH_WANT_LD_ORPHAN_WARN
156 select ARCH_WEAK_RELEASE_ACQUIRE
158 select BUILDTIME_TABLE_SORT
159 select CLONE_BACKWARDS
160 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
161 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
162 select DMA_OPS_BYPASS if PPC64
163 select DMA_OPS if PPC64
164 select DYNAMIC_FTRACE if FUNCTION_TRACER
165 select EDAC_ATOMIC_SCRUB
167 select GENERIC_ATOMIC64 if PPC32
168 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
169 select GENERIC_CMOS_UPDATE
170 select GENERIC_CPU_AUTOPROBE
171 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
172 select GENERIC_EARLY_IOREMAP
173 select GENERIC_GETTIMEOFDAY
174 select GENERIC_IRQ_SHOW
175 select GENERIC_IRQ_SHOW_LEVEL
176 select GENERIC_PCI_IOMAP if PCI
177 select GENERIC_PTDUMP
178 select GENERIC_SMP_IDLE_THREAD
179 select GENERIC_TIME_VSYSCALL
180 select GENERIC_VDSO_TIME_NS
181 select HAVE_ARCH_AUDITSYSCALL
182 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
183 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
184 select HAVE_ARCH_JUMP_LABEL
185 select HAVE_ARCH_JUMP_LABEL_RELATIVE
186 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
187 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
188 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
189 select HAVE_ARCH_KGDB
190 select HAVE_ARCH_MMAP_RND_BITS
191 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
192 select HAVE_ARCH_NVRAM_OPS
193 select HAVE_ARCH_SECCOMP_FILTER
194 select HAVE_ARCH_TRACEHOOK
195 select HAVE_ASM_MODVERSIONS
196 select HAVE_CONTEXT_TRACKING if PPC64
197 select HAVE_C_RECORDMCOUNT
198 select HAVE_DEBUG_KMEMLEAK
199 select HAVE_DEBUG_STACKOVERFLOW
200 select HAVE_DYNAMIC_FTRACE
201 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
203 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
205 select HAVE_FTRACE_MCOUNT_RECORD
206 select HAVE_FUNCTION_ERROR_INJECTION
207 select HAVE_FUNCTION_GRAPH_TRACER
208 select HAVE_FUNCTION_TRACER
209 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
210 select HAVE_GENERIC_VDSO
211 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
212 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
213 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
214 select HAVE_IOREMAP_PROT
215 select HAVE_IRQ_EXIT_ON_IRQ_STACK
216 select HAVE_IRQ_TIME_ACCOUNTING
217 select HAVE_KERNEL_GZIP
218 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
219 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
220 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
222 select HAVE_KPROBES_ON_FTRACE
223 select HAVE_KRETPROBES
224 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
225 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS && PPC64
226 select HAVE_MOD_ARCH_SPECIFIC
227 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
228 select HAVE_OPTPROBES
229 select HAVE_PERF_EVENTS
230 select HAVE_PERF_EVENTS_NMI if PPC64
231 select HAVE_PERF_REGS
232 select HAVE_PERF_USER_STACK_DUMP
233 select HAVE_REGS_AND_STACK_ACCESS_API
234 select HAVE_RELIABLE_STACKTRACE
236 select HAVE_SETUP_PER_CPU_AREA if PPC64
237 select HAVE_SOFTIRQ_ON_OWN_STACK
238 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
239 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
240 select HAVE_STATIC_CALL if PPC32
241 select HAVE_SYSCALL_TRACEPOINTS
242 select HAVE_VIRT_CPU_ACCOUNTING
243 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
244 select IOMMU_HELPER if PPC64
246 select IRQ_FORCED_THREADING
247 select MMU_GATHER_PAGE_SIZE
248 select MMU_GATHER_RCU_TABLE_FREE
249 select MODULES_USE_ELF_RELA
250 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
251 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
252 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
253 select NEED_SG_DMA_LENGTH
255 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
256 select OF_EARLY_FLATTREE
257 select OLD_SIGACTION if PPC32
258 select OLD_SIGSUSPEND
259 select PCI_DOMAINS if PCI
260 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
261 select PCI_SYSCALL if PCI
262 select PPC_DAWR if PPC64
265 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
266 select SYSCTL_EXCEPTION_TRACE
267 select THREAD_INFO_IN_TASK
268 select TRACE_IRQFLAGS_SUPPORT
269 select VIRT_TO_BUS if !PPC64
271 # Please keep this list sorted alphabetically.
274 config PPC_BARRIER_NOSPEC
277 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
288 bool "Enable support for 32bit binaries"
290 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
291 default y if !CPU_LITTLE_ENDIAN
292 select ARCH_WANT_OLD_COMPAT_IPC
293 select COMPAT_OLD_SIGACTION
295 config SYSVIPC_COMPAT
297 depends on COMPAT && SYSVIPC
300 config SCHED_OMIT_FRAME_POINTER
304 config ARCH_MAY_HAVE_PC_FDC
308 config PPC_UDBG_16550
311 config GENERIC_TBSYNC
313 default y if PPC32 && SMP
324 config GENERIC_BUG_RELATIVE_POINTERS
326 depends on GENERIC_BUG
328 config SYS_SUPPORTS_APM_EMULATION
329 default y if PMAC_APM_EMU
335 Used to allow a board to specify it wants an ePAPR compliant wrapper.
337 config DEFAULT_UIMAGE
340 Used to allow a board to specify it wants a uImage built by default
342 config ARCH_HIBERNATION_POSSIBLE
346 config ARCH_SUSPEND_POSSIBLE
348 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
349 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
352 config ARCH_SUSPEND_NONZERO_CPU
354 depends on PPC_POWERNV || PPC_PSERIES
356 config PPC_DCR_NATIVE
364 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
367 config PPC_OF_PLATFORM_PCI
370 depends on PPC64 # not supported on 32 bits yet
372 config ARCH_SUPPORTS_UPROBES
375 config PPC_ADV_DEBUG_REGS
377 depends on 40x || BOOKE
380 config PPC_ADV_DEBUG_IACS
382 depends on PPC_ADV_DEBUG_REGS
386 config PPC_ADV_DEBUG_DACS
388 depends on PPC_ADV_DEBUG_REGS
391 config PPC_ADV_DEBUG_DVCS
393 depends on PPC_ADV_DEBUG_REGS
397 config PPC_ADV_DEBUG_DAC_RANGE
399 depends on PPC_ADV_DEBUG_REGS && 44x
405 config PGTABLE_LEVELS
410 source "arch/powerpc/sysdev/Kconfig"
411 source "arch/powerpc/platforms/Kconfig"
413 menu "Kernel options"
416 bool "High memory support"
420 source "kernel/Kconfig.hz"
422 config MATH_EMULATION
423 bool "Math emulation"
424 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
427 Some PowerPC chips designed for embedded applications do not have
428 a floating-point unit and therefore do not implement the
429 floating-point instructions in the PowerPC instruction set. If you
430 say Y here, the kernel will include code to emulate a floating-point
431 unit, which will allow programs that use floating-point
434 This is also useful to emulate missing (optional) instructions
435 such as fsqrt on cores that do have an FPU but do not implement
436 them (such as Freescale BookE).
439 prompt "Math emulation options"
440 default MATH_EMULATION_FULL
441 depends on MATH_EMULATION
443 config MATH_EMULATION_FULL
444 bool "Emulate all the floating point instructions"
446 Select this option will enable the kernel to support to emulate
447 all the floating point instructions. If your SoC doesn't have
448 a FPU, you should select this.
450 config MATH_EMULATION_HW_UNIMPLEMENTED
451 bool "Just emulate the FPU unimplemented instructions"
453 Select this if you know there does have a hardware FPU on your
454 SoC, but some floating point instructions are not implemented by that.
458 config PPC_TRANSACTIONAL_MEM
459 bool "Transactional Memory support for POWERPC"
460 depends on PPC_BOOK3S_64
465 Support user-mode Transactional Memory on POWERPC.
468 bool "Ultravisor support"
469 depends on KVM_BOOK3S_HV_POSSIBLE
470 depends on DEVICE_PRIVATE
473 This option paravirtualizes the kernel to run in POWER platforms that
474 supports the Protected Execution Facility (PEF). On such platforms,
475 the ultravisor firmware runs at a privilege level above the
480 config LD_HEAD_STUB_CATCH
481 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
484 Very large kernels can cause linker branch stubs to be generated by
485 code in head_64.S, which moves the head text sections out of their
486 specified location. This option can work around the problem.
490 config MPROFILE_KERNEL
491 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
492 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
495 bool "Support for enabling/disabling CPUs"
496 depends on SMP && (PPC_PSERIES || \
497 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
499 Say Y here to be able to disable and re-enable individual
500 CPUs at runtime on SMP machines.
502 Say N if you are unsure.
504 config PPC_QUEUED_SPINLOCKS
505 bool "Queued spinlocks" if EXPERT
507 default PPC_BOOK3S_64
509 Say Y here to use queued spinlocks which give better scalability and
510 fairness on large SMP and NUMA systems without harming single threaded
513 config ARCH_CPU_PROBE_RELEASE
515 depends on HOTPLUG_CPU
517 config PPC64_SUPPORTS_MEMORY_FAILURE
518 bool "Add support for memory hwpoison"
519 depends on PPC_BOOK3S_64
520 default "y" if PPC_POWERNV
521 select ARCH_SUPPORTS_MEMORY_FAILURE
524 bool "kexec system call"
525 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
528 kexec is a system call that implements the ability to shutdown your
529 current kernel, and to start another kernel. It is like a reboot
530 but it is independent of the system firmware. And like a reboot
531 you can start any kernel with it, not just Linux.
533 The name comes from the similarity to the exec system call.
535 It is an ongoing process to be certain the hardware in a machine
536 is properly shutdown, so do not be surprised if this code does not
537 initially work for you. As of this writing the exact hardware
538 interface is strongly in flux, so no good recommendation can be
542 bool "kexec file based system call"
544 select HAVE_IMA_KEXEC if IMA
549 depends on CRYPTO_SHA256=y
551 This is a new version of the kexec system call. This call is
552 file based and takes in file descriptors as system call arguments
553 for kernel and initramfs as opposed to a list of segments as is the
554 case for the older kexec call.
556 config ARCH_HAS_KEXEC_PURGATORY
560 bool "Build a relocatable kernel"
561 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
562 select NONSTATIC_KERNEL
563 select MODULE_REL_CRCS if MODVERSIONS
565 This builds a kernel image that is capable of running at the
566 location the kernel is loaded at. For ppc32, there is no any
567 alignment restrictions, and this feature is a superset of
568 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
569 16k-aligned base address. The kernel is linked as a
570 position-independent executable (PIE) and contains dynamic relocations
571 which are processed early in the bootup process.
573 One use is for the kexec on panic case where the recovery kernel
574 must live at a different physical address than the primary
577 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
578 it has been loaded at and the compile time physical addresses
579 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
580 setting can still be useful to bootwrappers that need to know the
581 load address of the kernel (eg. u-boot/mkimage).
583 config RANDOMIZE_BASE
584 bool "Randomize the address of the kernel image"
585 depends on (FSL_BOOKE && FLATMEM && PPC32)
586 depends on RELOCATABLE
588 Randomizes the virtual address at which the kernel image is
589 loaded, as a security feature that deters exploit attempts
590 relying on knowledge of the location of kernel internals.
594 config RELOCATABLE_TEST
595 bool "Test relocatable kernel"
596 depends on (PPC64 && RELOCATABLE)
598 This runs the relocatable kernel at the address it was initially
599 loaded at, which tends to be non-zero and therefore test the
603 bool "Build a dump capture kernel"
604 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
605 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
607 Build a kernel suitable for use as a dump capture kernel.
608 The same kernel binary can be used as production kernel and dump
612 bool "Firmware-assisted dump"
613 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
617 A robust mechanism to get reliable kernel crash dump with
618 assistance from firmware. This approach does not use kexec,
619 instead firmware assists in booting the capture kernel
620 while preserving memory contents. Firmware-assisted dump
621 is meant to be a kdump replacement offering robustness and
622 speed not possible without system firmware assistance.
624 If unsure, say "y". Only special kernels like petitboot may
625 need to say "N" here.
627 config PRESERVE_FA_DUMP
628 bool "Preserve Firmware-assisted dump"
629 depends on PPC64 && PPC_POWERNV && !FA_DUMP
631 On a kernel with FA_DUMP disabled, this option helps to preserve
632 crash data from a previously crash'ed kernel. Useful when the next
633 memory preserving kernel boot would process this crash data.
634 Petitboot kernel is the typical usecase for this option.
637 bool "Export OPAL memory as /sys/firmware/opal/core"
638 depends on PPC64 && PPC_POWERNV
640 This option uses the MPIPL support in firmware to provide an
641 ELF core of OPAL memory after a crash. The ELF core is exported
642 as /sys/firmware/opal/core file which is helpful in debugging
643 OPAL crashes using GDB.
646 bool "Distribute interrupts on all CPUs by default"
649 This option gives the kernel permission to distribute IRQs across
650 multiple CPUs. Saying N here will route all IRQs to the first
651 CPU. Generally saying Y is safe, although some problems have been
652 reported with SMP Power Macintoshes with this option enabled.
655 bool "NUMA Memory Allocation and Scheduler Support"
656 depends on PPC64 && SMP
657 default y if PPC_PSERIES || PPC_POWERNV
658 select USE_PERCPU_NUMA_NODE_ID
660 Enable NUMA (Non-Uniform Memory Access) support.
662 The kernel will try to allocate memory used by a CPU on the
663 local memory controller of the CPU and add some more
664 NUMA awareness to the kernel.
672 config HAVE_MEMORYLESS_NODES
676 config ARCH_SELECT_MEMORY_MODEL
680 config ARCH_FLATMEM_ENABLE
682 depends on (PPC64 && !NUMA) || PPC32
684 config ARCH_SPARSEMEM_ENABLE
687 select SPARSEMEM_VMEMMAP_ENABLE
689 config ARCH_SPARSEMEM_DEFAULT
691 depends on PPC_BOOK3S_64
693 config ILLEGAL_POINTER_VALUE
695 # This is roughly half way between the top of user space and the bottom
696 # of kernel space, which seems about as good as we can get.
697 default 0x5deadbeef0000000 if PPC64
700 config ARCH_MEMORY_PROBE
702 depends on MEMORY_HOTPLUG
706 default PPC_64K_PAGES if PPC_BOOK3S_64
709 Select the kernel logical page size. Increasing the page size
710 will reduce software overhead at each page boundary, allow
711 hardware prefetch mechanisms to be more effective, and allow
712 larger dma transfers increasing IO efficiency and reducing
713 overhead. However the utilization of memory will increase.
714 For example, each cached file will using a multiple of the
715 page size to hold its contents and the difference between the
716 end of file and the end of page is wasted.
718 Some dedicated systems, such as software raid serving with
719 accelerated calculations, have shown significant increases.
721 If you configure a 64 bit kernel for 64k pages but the
722 processor does not support them, then the kernel will simulate
723 them with 4k pages, loading them on demand, but with the
724 reduced software overhead and larger internal fragmentation.
725 For the 32 bit kernel, a large page option will not be offered
726 unless it is supported by the configured processor.
728 If unsure, choose 4K_PAGES.
732 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
736 depends on 44x || PPC_8xx
740 depends on 44x || PPC_BOOK3S_64
741 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
743 config PPC_256K_PAGES
744 bool "256k page size (Requires non-standard binutils settings)"
745 depends on 44x && !PPC_47x
747 Make the page size 256k.
749 The kernel will only be able to run applications that have been
750 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
751 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
752 definition from 0x10000 to 0x40000 in older versions.
756 config PPC_PAGE_SHIFT
758 default 18 if PPC_256K_PAGES
759 default 16 if PPC_64K_PAGES
760 default 14 if PPC_16K_PAGES
764 int "Thread shift" if EXPERT
766 default "15" if PPC_256K_PAGES
767 default "14" if PPC64
768 default "14" if KASAN
771 Used to define the stack size. The default is almost always what you
772 want. Only change this if you know what you are doing.
774 config DATA_SHIFT_BOOL
775 bool "Set custom data alignment"
776 depends on ADVANCED_OPTIONS
777 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
778 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
781 This option allows you to set the kernel data alignment. When
782 RAM is mapped by blocks, the alignment needs to fit the size and
783 number of possible blocks. The default should be OK for most configs.
785 Say N here unless you know what you are doing.
788 int "Data shift" if DATA_SHIFT_BOOL
789 default 24 if STRICT_KERNEL_RWX && PPC64
790 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
791 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
792 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
793 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
794 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
795 default 23 if STRICT_KERNEL_RWX && PPC_8xx
796 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
797 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
798 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
799 default PPC_PAGE_SHIFT
801 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
802 Smaller is the alignment, greater is the number of necessary DBATs.
804 On 8xx, large pages (512kb or 8M) are used to map kernel linear
805 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
806 in that case. If PIN_TLB is selected, it must be aligned to 8M as
807 8M pages will be pinned.
809 config FORCE_MAX_ZONEORDER
810 int "Maximum zone order"
811 range 8 9 if PPC64 && PPC_64K_PAGES
812 default "9" if PPC64 && PPC_64K_PAGES
813 range 13 13 if PPC64 && !PPC_64K_PAGES
814 default "13" if PPC64 && !PPC_64K_PAGES
815 range 9 64 if PPC32 && PPC_16K_PAGES
816 default "9" if PPC32 && PPC_16K_PAGES
817 range 7 64 if PPC32 && PPC_64K_PAGES
818 default "7" if PPC32 && PPC_64K_PAGES
819 range 5 64 if PPC32 && PPC_256K_PAGES
820 default "5" if PPC32 && PPC_256K_PAGES
824 The kernel memory allocator divides physically contiguous memory
825 blocks into "zones", where each zone is a power of two number of
826 pages. This option selects the largest power of two that the kernel
827 keeps in the memory allocator. If you need to allocate very large
828 blocks of physically contiguous memory, then you may need to
831 This config option is actually maximum order plus one. For example,
832 a value of 11 means that the largest free memory block is 2^10 pages.
834 The page size is not necessarily 4KB. For example, on 64-bit
835 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
836 this in mind when choosing a value for this option.
838 config PPC_SUBPAGE_PROT
839 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
841 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
843 This option adds support for system call to allow user programs
844 to set access permissions (read/write, readonly, or no access)
845 on the 4k subpages of each 64k page.
847 If unsure, say N here.
849 config PPC_PROT_SAO_LPAR
850 bool "Support PROT_SAO mappings in LPARs"
851 depends on PPC_BOOK3S_64
853 This option adds support for PROT_SAO mappings from userspace
854 inside LPARs on supported CPUs.
856 This may cause issues when performing guest migration from
857 a CPU that supports SAO to one that does not.
859 If unsure, say N here.
861 config PPC_COPRO_BASE
865 bool "SMT (Hyperthreading) scheduler support"
866 depends on PPC64 && SMP
868 SMT scheduler support improves the CPU scheduler's decision making
869 when dealing with POWER5 cpus at a cost of slightly increased
870 overhead in some places. If unsure say N here.
872 config PPC_DENORMALISATION
873 bool "PowerPC denormalisation exception handling"
874 depends on PPC_BOOK3S_64
875 default "y" if PPC_POWERNV
877 Add support for handling denormalisation of single precision
878 values. Useful for bare metal only. If unsure say Y here.
881 string "Initial kernel command string"
884 On some platforms, there is currently no way for the boot loader to
885 pass arguments to the kernel. For these platforms, you can supply
886 some command-line options at build time by entering them here. In
887 most cases you will need to specify the root device here.
890 prompt "Kernel command line type" if CMDLINE != ""
891 default CMDLINE_FROM_BOOTLOADER
893 config CMDLINE_FROM_BOOTLOADER
894 bool "Use bootloader kernel arguments if available"
896 Uses the command-line options passed by the boot loader. If
897 the boot loader doesn't provide any, the default kernel command
898 string provided in CMDLINE will be used.
900 config CMDLINE_EXTEND
901 bool "Extend bootloader kernel arguments"
903 The command-line arguments provided by the boot loader will be
904 appended to the default kernel command string.
907 bool "Always use the default kernel command string"
909 Always use the default kernel command string, even if the boot
910 loader passes other arguments to the kernel.
911 This is useful if you cannot or don't want to change the
912 command-line options your boot loader passes to the kernel.
917 string "Additional default image types"
919 List additional targets to be built by the bootwrapper here (separated
920 by spaces). This is useful for targets that depend of device tree
921 files in the .dts directory.
923 Targets in this list will be build as part of the default build
924 target, or when the user does a 'make zImage' or a
925 'make zImage.initrd'.
927 If unsure, leave blank
929 config ARCH_WANTS_FREEZER_CONTROL
933 source "kernel/power/Kconfig"
936 prompt "PowerPC Memory Protection Keys"
938 depends on PPC_BOOK3S_64
939 depends on PPC_64S_HASH_MMU
940 select ARCH_USES_HIGH_VMA_FLAGS
941 select ARCH_HAS_PKEYS
943 Memory Protection Keys provides a mechanism for enforcing
944 page-based protections, but without requiring modification of the
945 page tables when an application changes protection domains.
947 For details, see Documentation/core-api/protection-keys.rst
951 config PPC_SECURE_BOOT
952 prompt "Enable secure boot support"
954 depends on PPC_POWERNV || PPC_PSERIES
955 depends on IMA_ARCH_POLICY
956 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
958 Systems with firmware secure boot enabled need to define security
959 policies to extend secure boot to the OS. This config allows a user
960 to enable OS secure boot on systems that have firmware support for
961 it. If in doubt say N.
963 config PPC_SECVAR_SYSFS
964 bool "Enable sysfs interface for POWER secure variables"
966 depends on PPC_SECURE_BOOT
969 POWER secure variables are managed and controlled by firmware.
970 These variables are exposed to userspace via sysfs to enable
971 read/write operations on these variables. Say Y if you have
972 secure boot enabled and want to expose variables to userspace.
974 config PPC_RTAS_FILTER
975 bool "Enable filtering of RTAS syscalls"
979 The RTAS syscall API has security issues that could be used to
980 compromise system integrity. This option enforces restrictions on the
981 RTAS calls and arguments passed by userspace programs to mitigate
984 Say Y unless you know what you are doing and the filter is causing
996 bool "Support for ISA-bus hardware"
1000 Find out whether you have ISA slots on your motherboard. ISA is the
1001 name of a bus system, i.e. the way the CPU talks to the other stuff
1002 inside your box. If you have an Apple machine, say N here; if you
1003 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1004 embedded board, consult your board documentation.
1006 config GENERIC_ISA_DMA
1008 depends on ISA_DMA_API
1011 config PPC_INDIRECT_PCI
1014 default y if 40x || 44x
1024 select ARCH_HAS_DMA_SET_MASK
1025 select PPC_INDIRECT_PCI
1031 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1033 Freescale MPC85xx/MPC86xx power management controller support
1034 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1039 depends on SUSPEND && (44x || 40x)
1041 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1042 It also enables support for two different idle states (idle-wait
1049 bool "Freescale Local Bus support"
1051 Enables reporting of errors from the Freescale local bus
1052 controller. Also contains some common code used by
1053 drivers for specific local bus peripherals.
1057 depends on PPC_83xx || QUICC_ENGINE || CPM2
1059 Freescale General-purpose Timers support
1063 depends on PCI && 8260
1064 select PPC_INDIRECT_PCI
1068 bool "Freescale Embedded SRIO Controller support"
1069 depends on RAPIDIO = y && HAVE_RAPIDIO
1072 Include support for RapidIO controller on Freescale embedded
1073 processors (MPC8548, MPC8641, etc).
1077 config NONSTATIC_KERNEL
1080 menu "Advanced setup"
1083 config ADVANCED_OPTIONS
1084 bool "Prompt for advanced kernel configuration options"
1086 This option will enable prompting for a variety of advanced kernel
1087 configuration options. These options can cause the kernel to not
1088 work if they are set incorrectly, but can be used to optimize certain
1089 aspects of kernel memory management.
1091 Unless you know what you are doing, say N here.
1093 comment "Default settings for advanced configuration options are used"
1094 depends on !ADVANCED_OPTIONS
1096 config LOWMEM_SIZE_BOOL
1097 bool "Set maximum low memory"
1098 depends on ADVANCED_OPTIONS
1100 This option allows you to set the maximum amount of memory which
1101 will be used as "low memory", that is, memory which the kernel can
1102 access directly, without having to set up a kernel virtual mapping.
1103 This can be useful in optimizing the layout of kernel virtual
1106 Say N here unless you know what you are doing.
1109 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1110 default "0x30000000"
1112 config LOWMEM_CAM_NUM_BOOL
1113 bool "Set number of CAMs to use to map low memory"
1114 depends on ADVANCED_OPTIONS && FSL_BOOKE
1116 This option allows you to set the maximum number of CAM slots that
1117 will be used to map low memory. There are a limited number of slots
1118 available and even more limited number that will fit in the L1 MMU.
1119 However, using more entries will allow mapping more low memory. This
1120 can be useful in optimizing the layout of kernel virtual memory.
1122 Say N here unless you know what you are doing.
1124 config LOWMEM_CAM_NUM
1125 depends on FSL_BOOKE
1126 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1127 default 3 if !STRICT_KERNEL_RWX
1128 default 9 if DATA_SHIFT >= 24
1129 default 12 if DATA_SHIFT >= 22
1132 config DYNAMIC_MEMSTART
1133 bool "Enable page aligned dynamic load address for kernel"
1134 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1135 select NONSTATIC_KERNEL
1137 This option enables the kernel to be loaded at any page aligned
1138 physical address. The kernel creates a mapping from KERNELBASE to
1139 the address where the kernel is loaded. The page size here implies
1140 the TLB page size of the mapping for kernel on the particular platform.
1141 Please refer to the init code for finding the TLB page size.
1143 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1144 kernel image, where the only restriction is the page aligned kernel
1145 load address. When this option is enabled, the compile time physical
1146 address CONFIG_PHYSICAL_START is ignored.
1148 This option is overridden by CONFIG_RELOCATABLE
1150 config PAGE_OFFSET_BOOL
1151 bool "Set custom page offset address"
1152 depends on ADVANCED_OPTIONS
1154 This option allows you to set the kernel virtual address at which
1155 the kernel will map low memory. This can be useful in optimizing
1156 the virtual memory layout of the system.
1158 Say N here unless you know what you are doing.
1161 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1162 default "0xc0000000"
1164 config KERNEL_START_BOOL
1165 bool "Set custom kernel base address"
1166 depends on ADVANCED_OPTIONS
1168 This option allows you to set the kernel virtual address at which
1169 the kernel will be loaded. Normally this should match PAGE_OFFSET
1170 however there are times (like kdump) that one might not want them
1173 Say N here unless you know what you are doing.
1176 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1177 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1178 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1179 default "0xc0000000"
1181 config PHYSICAL_START_BOOL
1182 bool "Set physical address where the kernel is loaded"
1183 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1185 This gives the physical address where the kernel is loaded.
1187 Say N here unless you know what you are doing.
1189 config PHYSICAL_START
1190 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1191 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1192 default "0x00000000"
1194 config PHYSICAL_ALIGN
1196 default "0x04000000" if FSL_BOOKE
1198 This value puts the alignment restrictions on physical address
1199 where kernel is loaded and run from. Kernel is compiled for an
1200 address which meets above alignment restriction.
1202 config TASK_SIZE_BOOL
1203 bool "Set custom user task size"
1204 depends on ADVANCED_OPTIONS
1206 This option allows you to set the amount of virtual address space
1207 allocated to user tasks. This can be useful in optimizing the
1208 virtual memory layout of the system.
1210 Say N here unless you know what you are doing.
1213 hex "Size of user task space" if TASK_SIZE_BOOL
1214 default "0x80000000" if PPC_8xx
1215 default "0xb0000000" if PPC_BOOK3S_32
1216 default "0xc0000000"
1220 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1223 default "0xc000000000000000"
1226 default "0xc000000000000000"
1227 config PHYSICAL_START
1229 default "0x00000000"
1235 config PPC_LIB_RHEAP
1238 source "arch/powerpc/kvm/Kconfig"
1240 source "kernel/livepatch/Kconfig"