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_DEBUG_VIRTUAL
112 select ARCH_HAS_DEBUG_VM_PGTABLE
113 select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
114 select ARCH_HAS_DEVMEM_IS_ALLOWED
115 select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
116 select ARCH_HAS_ELF_RANDOMIZE
117 select ARCH_HAS_FORTIFY_SOURCE
118 select ARCH_HAS_GCOV_PROFILE_ALL
119 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
121 select ARCH_HAS_MEMBARRIER_CALLBACKS
122 select ARCH_HAS_MEMBARRIER_SYNC_CORE
123 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
124 select ARCH_HAS_MMIOWB if PPC64
125 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
126 select ARCH_HAS_PHYS_TO_DMA
127 select ARCH_HAS_PMEM_API
128 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
129 select ARCH_HAS_PTE_SPECIAL
130 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
131 select ARCH_HAS_SET_MEMORY
132 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
133 select ARCH_HAS_STRICT_KERNEL_RWX if FSL_BOOKE && !HIBERNATION && !RANDOMIZE_BASE
134 select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX && !PPC_BOOK3S_32
135 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
136 select ARCH_HAS_UACCESS_FLUSHCACHE
137 select ARCH_HAS_UBSAN_SANITIZE_ALL
138 select ARCH_HAVE_NMI_SAFE_CMPXCHG
139 select ARCH_KEEP_MEMBLOCK
140 select ARCH_MIGHT_HAVE_PC_PARPORT
141 select ARCH_MIGHT_HAVE_PC_SERIO
142 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
143 select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
144 select ARCH_STACKWALK
145 select ARCH_SUPPORTS_ATOMIC_RMW
146 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
147 select ARCH_USE_BUILTIN_BSWAP
148 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
149 select ARCH_USE_MEMTEST
150 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
151 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
152 select ARCH_WANT_IPC_PARSE_VERSION
153 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
154 select ARCH_WANT_LD_ORPHAN_WARN
155 select ARCH_WEAK_RELEASE_ACQUIRE
157 select BUILDTIME_TABLE_SORT
158 select CLONE_BACKWARDS
159 select CPUMASK_OFFSTACK if NR_CPUS >= 8192
160 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
161 select DMA_OPS_BYPASS if PPC64
162 select DMA_OPS if PPC64
163 select DYNAMIC_FTRACE if FUNCTION_TRACER
164 select EDAC_ATOMIC_SCRUB
166 select GENERIC_ATOMIC64 if PPC32
167 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
168 select GENERIC_CMOS_UPDATE
169 select GENERIC_CPU_AUTOPROBE
170 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
171 select GENERIC_EARLY_IOREMAP
172 select GENERIC_GETTIMEOFDAY
173 select GENERIC_IRQ_SHOW
174 select GENERIC_IRQ_SHOW_LEVEL
175 select GENERIC_PCI_IOMAP if PCI
176 select GENERIC_PTDUMP
177 select GENERIC_SMP_IDLE_THREAD
178 select GENERIC_TIME_VSYSCALL
179 select GENERIC_VDSO_TIME_NS
180 select HAVE_ARCH_AUDITSYSCALL
181 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
182 select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
183 select HAVE_ARCH_JUMP_LABEL
184 select HAVE_ARCH_JUMP_LABEL_RELATIVE
185 select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
186 select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
187 select HAVE_ARCH_KFENCE if PPC_BOOK3S_32 || PPC_8xx || 40x
188 select HAVE_ARCH_KGDB
189 select HAVE_ARCH_MMAP_RND_BITS
190 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
191 select HAVE_ARCH_NVRAM_OPS
192 select HAVE_ARCH_SECCOMP_FILTER
193 select HAVE_ARCH_TRACEHOOK
194 select HAVE_ASM_MODVERSIONS
195 select HAVE_CONTEXT_TRACKING if PPC64
196 select HAVE_C_RECORDMCOUNT
197 select HAVE_DEBUG_KMEMLEAK
198 select HAVE_DEBUG_STACKOVERFLOW
199 select HAVE_DYNAMIC_FTRACE
200 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL || PPC32
202 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
204 select HAVE_FTRACE_MCOUNT_RECORD
205 select HAVE_FUNCTION_ERROR_INJECTION
206 select HAVE_FUNCTION_GRAPH_TRACER
207 select HAVE_FUNCTION_TRACER
208 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
209 select HAVE_GENERIC_VDSO
210 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
211 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
212 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
213 select HAVE_IOREMAP_PROT
214 select HAVE_IRQ_EXIT_ON_IRQ_STACK
215 select HAVE_IRQ_TIME_ACCOUNTING
216 select HAVE_KERNEL_GZIP
217 select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
218 select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
219 select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
221 select HAVE_KPROBES_ON_FTRACE
222 select HAVE_KRETPROBES
223 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
224 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS && PPC64
225 select HAVE_MOD_ARCH_SPECIFIC
226 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
227 select HAVE_OPTPROBES
228 select HAVE_PERF_EVENTS
229 select HAVE_PERF_EVENTS_NMI if PPC64
230 select HAVE_PERF_REGS
231 select HAVE_PERF_USER_STACK_DUMP
232 select HAVE_REGS_AND_STACK_ACCESS_API
233 select HAVE_RELIABLE_STACKTRACE
235 select HAVE_SETUP_PER_CPU_AREA if PPC64
236 select HAVE_SOFTIRQ_ON_OWN_STACK
237 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
238 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
239 select HAVE_STATIC_CALL if PPC32
240 select HAVE_SYSCALL_TRACEPOINTS
241 select HAVE_VIRT_CPU_ACCOUNTING
242 select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
243 select IOMMU_HELPER if PPC64
245 select IRQ_FORCED_THREADING
246 select MMU_GATHER_PAGE_SIZE
247 select MMU_GATHER_RCU_TABLE_FREE
248 select MODULES_USE_ELF_RELA
249 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
250 select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
251 select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
252 select NEED_SG_DMA_LENGTH
254 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
255 select OF_EARLY_FLATTREE
256 select OLD_SIGACTION if PPC32
257 select OLD_SIGSUSPEND
258 select PCI_DOMAINS if PCI
259 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
260 select PCI_SYSCALL if PCI
261 select PPC_DAWR if PPC64
264 select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
265 select SYSCTL_EXCEPTION_TRACE
266 select THREAD_INFO_IN_TASK
267 select TRACE_IRQFLAGS_SUPPORT
268 select VIRT_TO_BUS if !PPC64
270 # Please keep this list sorted alphabetically.
273 config PPC_BARRIER_NOSPEC
276 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
287 bool "Enable support for 32bit binaries"
289 depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
290 default y if !CPU_LITTLE_ENDIAN
291 select ARCH_WANT_OLD_COMPAT_IPC
292 select COMPAT_OLD_SIGACTION
294 config SYSVIPC_COMPAT
296 depends on COMPAT && SYSVIPC
299 config SCHED_OMIT_FRAME_POINTER
303 config ARCH_MAY_HAVE_PC_FDC
307 config PPC_UDBG_16550
310 config GENERIC_TBSYNC
312 default y if PPC32 && SMP
323 config GENERIC_BUG_RELATIVE_POINTERS
325 depends on GENERIC_BUG
327 config SYS_SUPPORTS_APM_EMULATION
328 default y if PMAC_APM_EMU
334 Used to allow a board to specify it wants an ePAPR compliant wrapper.
336 config DEFAULT_UIMAGE
339 Used to allow a board to specify it wants a uImage built by default
341 config ARCH_HIBERNATION_POSSIBLE
345 config ARCH_SUSPEND_POSSIBLE
347 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
348 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
351 config ARCH_SUSPEND_NONZERO_CPU
353 depends on PPC_POWERNV || PPC_PSERIES
355 config PPC_DCR_NATIVE
363 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
366 config PPC_OF_PLATFORM_PCI
369 depends on PPC64 # not supported on 32 bits yet
371 config ARCH_SUPPORTS_UPROBES
374 config PPC_ADV_DEBUG_REGS
376 depends on 40x || BOOKE
379 config PPC_ADV_DEBUG_IACS
381 depends on PPC_ADV_DEBUG_REGS
385 config PPC_ADV_DEBUG_DACS
387 depends on PPC_ADV_DEBUG_REGS
390 config PPC_ADV_DEBUG_DVCS
392 depends on PPC_ADV_DEBUG_REGS
396 config PPC_ADV_DEBUG_DAC_RANGE
398 depends on PPC_ADV_DEBUG_REGS && 44x
404 config PGTABLE_LEVELS
409 source "arch/powerpc/sysdev/Kconfig"
410 source "arch/powerpc/platforms/Kconfig"
412 menu "Kernel options"
415 bool "High memory support"
419 source "kernel/Kconfig.hz"
421 config MATH_EMULATION
422 bool "Math emulation"
423 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
426 Some PowerPC chips designed for embedded applications do not have
427 a floating-point unit and therefore do not implement the
428 floating-point instructions in the PowerPC instruction set. If you
429 say Y here, the kernel will include code to emulate a floating-point
430 unit, which will allow programs that use floating-point
433 This is also useful to emulate missing (optional) instructions
434 such as fsqrt on cores that do have an FPU but do not implement
435 them (such as Freescale BookE).
438 prompt "Math emulation options"
439 default MATH_EMULATION_FULL
440 depends on MATH_EMULATION
442 config MATH_EMULATION_FULL
443 bool "Emulate all the floating point instructions"
445 Select this option will enable the kernel to support to emulate
446 all the floating point instructions. If your SoC doesn't have
447 a FPU, you should select this.
449 config MATH_EMULATION_HW_UNIMPLEMENTED
450 bool "Just emulate the FPU unimplemented instructions"
452 Select this if you know there does have a hardware FPU on your
453 SoC, but some floating point instructions are not implemented by that.
457 config PPC_TRANSACTIONAL_MEM
458 bool "Transactional Memory support for POWERPC"
459 depends on PPC_BOOK3S_64
464 Support user-mode Transactional Memory on POWERPC.
467 bool "Ultravisor support"
468 depends on KVM_BOOK3S_HV_POSSIBLE
469 depends on DEVICE_PRIVATE
472 This option paravirtualizes the kernel to run in POWER platforms that
473 supports the Protected Execution Facility (PEF). On such platforms,
474 the ultravisor firmware runs at a privilege level above the
479 config LD_HEAD_STUB_CATCH
480 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
483 Very large kernels can cause linker branch stubs to be generated by
484 code in head_64.S, which moves the head text sections out of their
485 specified location. This option can work around the problem.
489 config MPROFILE_KERNEL
490 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
491 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
494 bool "Support for enabling/disabling CPUs"
495 depends on SMP && (PPC_PSERIES || \
496 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
498 Say Y here to be able to disable and re-enable individual
499 CPUs at runtime on SMP machines.
501 Say N if you are unsure.
503 config PPC_QUEUED_SPINLOCKS
504 bool "Queued spinlocks" if EXPERT
506 default PPC_BOOK3S_64
508 Say Y here to use queued spinlocks which give better scalability and
509 fairness on large SMP and NUMA systems without harming single threaded
512 config ARCH_CPU_PROBE_RELEASE
514 depends on HOTPLUG_CPU
516 config PPC64_SUPPORTS_MEMORY_FAILURE
517 bool "Add support for memory hwpoison"
518 depends on PPC_BOOK3S_64
519 default "y" if PPC_POWERNV
520 select ARCH_SUPPORTS_MEMORY_FAILURE
523 bool "kexec system call"
524 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
527 kexec is a system call that implements the ability to shutdown your
528 current kernel, and to start another kernel. It is like a reboot
529 but it is independent of the system firmware. And like a reboot
530 you can start any kernel with it, not just Linux.
532 The name comes from the similarity to the exec system call.
534 It is an ongoing process to be certain the hardware in a machine
535 is properly shutdown, so do not be surprised if this code does not
536 initially work for you. As of this writing the exact hardware
537 interface is strongly in flux, so no good recommendation can be
541 bool "kexec file based system call"
543 select HAVE_IMA_KEXEC if IMA
548 depends on CRYPTO_SHA256=y
550 This is a new version of the kexec system call. This call is
551 file based and takes in file descriptors as system call arguments
552 for kernel and initramfs as opposed to a list of segments as is the
553 case for the older kexec call.
555 config ARCH_HAS_KEXEC_PURGATORY
559 bool "Build a relocatable kernel"
560 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
561 select NONSTATIC_KERNEL
562 select MODULE_REL_CRCS if MODVERSIONS
564 This builds a kernel image that is capable of running at the
565 location the kernel is loaded at. For ppc32, there is no any
566 alignment restrictions, and this feature is a superset of
567 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
568 16k-aligned base address. The kernel is linked as a
569 position-independent executable (PIE) and contains dynamic relocations
570 which are processed early in the bootup process.
572 One use is for the kexec on panic case where the recovery kernel
573 must live at a different physical address than the primary
576 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
577 it has been loaded at and the compile time physical addresses
578 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
579 setting can still be useful to bootwrappers that need to know the
580 load address of the kernel (eg. u-boot/mkimage).
582 config RANDOMIZE_BASE
583 bool "Randomize the address of the kernel image"
584 depends on (FSL_BOOKE && FLATMEM && PPC32)
585 depends on RELOCATABLE
587 Randomizes the virtual address at which the kernel image is
588 loaded, as a security feature that deters exploit attempts
589 relying on knowledge of the location of kernel internals.
593 config RELOCATABLE_TEST
594 bool "Test relocatable kernel"
595 depends on (PPC64 && RELOCATABLE)
597 This runs the relocatable kernel at the address it was initially
598 loaded at, which tends to be non-zero and therefore test the
602 bool "Build a dump capture kernel"
603 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
604 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
606 Build a kernel suitable for use as a dump capture kernel.
607 The same kernel binary can be used as production kernel and dump
611 bool "Firmware-assisted dump"
612 depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
616 A robust mechanism to get reliable kernel crash dump with
617 assistance from firmware. This approach does not use kexec,
618 instead firmware assists in booting the capture kernel
619 while preserving memory contents. Firmware-assisted dump
620 is meant to be a kdump replacement offering robustness and
621 speed not possible without system firmware assistance.
623 If unsure, say "y". Only special kernels like petitboot may
624 need to say "N" here.
626 config PRESERVE_FA_DUMP
627 bool "Preserve Firmware-assisted dump"
628 depends on PPC64 && PPC_POWERNV && !FA_DUMP
630 On a kernel with FA_DUMP disabled, this option helps to preserve
631 crash data from a previously crash'ed kernel. Useful when the next
632 memory preserving kernel boot would process this crash data.
633 Petitboot kernel is the typical usecase for this option.
636 bool "Export OPAL memory as /sys/firmware/opal/core"
637 depends on PPC64 && PPC_POWERNV
639 This option uses the MPIPL support in firmware to provide an
640 ELF core of OPAL memory after a crash. The ELF core is exported
641 as /sys/firmware/opal/core file which is helpful in debugging
642 OPAL crashes using GDB.
645 bool "Distribute interrupts on all CPUs by default"
648 This option gives the kernel permission to distribute IRQs across
649 multiple CPUs. Saying N here will route all IRQs to the first
650 CPU. Generally saying Y is safe, although some problems have been
651 reported with SMP Power Macintoshes with this option enabled.
654 bool "NUMA Memory Allocation and Scheduler Support"
655 depends on PPC64 && SMP
656 default y if PPC_PSERIES || PPC_POWERNV
657 select USE_PERCPU_NUMA_NODE_ID
659 Enable NUMA (Non-Uniform Memory Access) support.
661 The kernel will try to allocate memory used by a CPU on the
662 local memory controller of the CPU and add some more
663 NUMA awareness to the kernel.
671 config HAVE_MEMORYLESS_NODES
675 config ARCH_SELECT_MEMORY_MODEL
679 config ARCH_FLATMEM_ENABLE
681 depends on (PPC64 && !NUMA) || PPC32
683 config ARCH_SPARSEMEM_ENABLE
686 select SPARSEMEM_VMEMMAP_ENABLE
688 config ARCH_SPARSEMEM_DEFAULT
690 depends on PPC_BOOK3S_64
692 config ILLEGAL_POINTER_VALUE
694 # This is roughly half way between the top of user space and the bottom
695 # of kernel space, which seems about as good as we can get.
696 default 0x5deadbeef0000000 if PPC64
699 config ARCH_MEMORY_PROBE
701 depends on MEMORY_HOTPLUG
705 default PPC_64K_PAGES if PPC_BOOK3S_64
708 Select the kernel logical page size. Increasing the page size
709 will reduce software overhead at each page boundary, allow
710 hardware prefetch mechanisms to be more effective, and allow
711 larger dma transfers increasing IO efficiency and reducing
712 overhead. However the utilization of memory will increase.
713 For example, each cached file will using a multiple of the
714 page size to hold its contents and the difference between the
715 end of file and the end of page is wasted.
717 Some dedicated systems, such as software raid serving with
718 accelerated calculations, have shown significant increases.
720 If you configure a 64 bit kernel for 64k pages but the
721 processor does not support them, then the kernel will simulate
722 them with 4k pages, loading them on demand, but with the
723 reduced software overhead and larger internal fragmentation.
724 For the 32 bit kernel, a large page option will not be offered
725 unless it is supported by the configured processor.
727 If unsure, choose 4K_PAGES.
731 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
735 depends on 44x || PPC_8xx
739 depends on 44x || PPC_BOOK3S_64
740 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
742 config PPC_256K_PAGES
743 bool "256k page size (Requires non-standard binutils settings)"
744 depends on 44x && !PPC_47x
746 Make the page size 256k.
748 The kernel will only be able to run applications that have been
749 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
750 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
751 definition from 0x10000 to 0x40000 in older versions.
755 config PPC_PAGE_SHIFT
757 default 18 if PPC_256K_PAGES
758 default 16 if PPC_64K_PAGES
759 default 14 if PPC_16K_PAGES
763 int "Thread shift" if EXPERT
765 default "15" if PPC_256K_PAGES
766 default "14" if PPC64
767 default "14" if KASAN
770 Used to define the stack size. The default is almost always what you
771 want. Only change this if you know what you are doing.
773 config DATA_SHIFT_BOOL
774 bool "Set custom data alignment"
775 depends on ADVANCED_OPTIONS
776 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
777 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
780 This option allows you to set the kernel data alignment. When
781 RAM is mapped by blocks, the alignment needs to fit the size and
782 number of possible blocks. The default should be OK for most configs.
784 Say N here unless you know what you are doing.
787 int "Data shift" if DATA_SHIFT_BOOL
788 default 24 if STRICT_KERNEL_RWX && PPC64
789 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
790 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
791 range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_FSL_BOOKE
792 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
793 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
794 default 23 if STRICT_KERNEL_RWX && PPC_8xx
795 default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
796 default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
797 default 24 if STRICT_KERNEL_RWX && FSL_BOOKE
798 default PPC_PAGE_SHIFT
800 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
801 Smaller is the alignment, greater is the number of necessary DBATs.
803 On 8xx, large pages (512kb or 8M) are used to map kernel linear
804 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
805 in that case. If PIN_TLB is selected, it must be aligned to 8M as
806 8M pages will be pinned.
808 config FORCE_MAX_ZONEORDER
809 int "Maximum zone order"
810 range 8 9 if PPC64 && PPC_64K_PAGES
811 default "9" if PPC64 && PPC_64K_PAGES
812 range 13 13 if PPC64 && !PPC_64K_PAGES
813 default "13" if PPC64 && !PPC_64K_PAGES
814 range 9 64 if PPC32 && PPC_16K_PAGES
815 default "9" if PPC32 && PPC_16K_PAGES
816 range 7 64 if PPC32 && PPC_64K_PAGES
817 default "7" if PPC32 && PPC_64K_PAGES
818 range 5 64 if PPC32 && PPC_256K_PAGES
819 default "5" if PPC32 && PPC_256K_PAGES
823 The kernel memory allocator divides physically contiguous memory
824 blocks into "zones", where each zone is a power of two number of
825 pages. This option selects the largest power of two that the kernel
826 keeps in the memory allocator. If you need to allocate very large
827 blocks of physically contiguous memory, then you may need to
830 This config option is actually maximum order plus one. For example,
831 a value of 11 means that the largest free memory block is 2^10 pages.
833 The page size is not necessarily 4KB. For example, on 64-bit
834 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
835 this in mind when choosing a value for this option.
837 config PPC_SUBPAGE_PROT
838 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
840 depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
842 This option adds support for system call to allow user programs
843 to set access permissions (read/write, readonly, or no access)
844 on the 4k subpages of each 64k page.
846 If unsure, say N here.
848 config PPC_PROT_SAO_LPAR
849 bool "Support PROT_SAO mappings in LPARs"
850 depends on PPC_BOOK3S_64
852 This option adds support for PROT_SAO mappings from userspace
853 inside LPARs on supported CPUs.
855 This may cause issues when performing guest migration from
856 a CPU that supports SAO to one that does not.
858 If unsure, say N here.
860 config PPC_COPRO_BASE
864 bool "SMT (Hyperthreading) scheduler support"
865 depends on PPC64 && SMP
867 SMT scheduler support improves the CPU scheduler's decision making
868 when dealing with POWER5 cpus at a cost of slightly increased
869 overhead in some places. If unsure say N here.
871 config PPC_DENORMALISATION
872 bool "PowerPC denormalisation exception handling"
873 depends on PPC_BOOK3S_64
874 default "y" if PPC_POWERNV
876 Add support for handling denormalisation of single precision
877 values. Useful for bare metal only. If unsure say Y here.
880 string "Initial kernel command string"
883 On some platforms, there is currently no way for the boot loader to
884 pass arguments to the kernel. For these platforms, you can supply
885 some command-line options at build time by entering them here. In
886 most cases you will need to specify the root device here.
889 prompt "Kernel command line type" if CMDLINE != ""
890 default CMDLINE_FROM_BOOTLOADER
892 config CMDLINE_FROM_BOOTLOADER
893 bool "Use bootloader kernel arguments if available"
895 Uses the command-line options passed by the boot loader. If
896 the boot loader doesn't provide any, the default kernel command
897 string provided in CMDLINE will be used.
899 config CMDLINE_EXTEND
900 bool "Extend bootloader kernel arguments"
902 The command-line arguments provided by the boot loader will be
903 appended to the default kernel command string.
906 bool "Always use the default kernel command string"
908 Always use the default kernel command string, even if the boot
909 loader passes other arguments to the kernel.
910 This is useful if you cannot or don't want to change the
911 command-line options your boot loader passes to the kernel.
916 string "Additional default image types"
918 List additional targets to be built by the bootwrapper here (separated
919 by spaces). This is useful for targets that depend of device tree
920 files in the .dts directory.
922 Targets in this list will be build as part of the default build
923 target, or when the user does a 'make zImage' or a
924 'make zImage.initrd'.
926 If unsure, leave blank
928 config ARCH_WANTS_FREEZER_CONTROL
932 source "kernel/power/Kconfig"
935 prompt "PowerPC Memory Protection Keys"
937 depends on PPC_BOOK3S_64
938 depends on PPC_64S_HASH_MMU
939 select ARCH_USES_HIGH_VMA_FLAGS
940 select ARCH_HAS_PKEYS
942 Memory Protection Keys provides a mechanism for enforcing
943 page-based protections, but without requiring modification of the
944 page tables when an application changes protection domains.
946 For details, see Documentation/core-api/protection-keys.rst
950 config PPC_SECURE_BOOT
951 prompt "Enable secure boot support"
953 depends on PPC_POWERNV || PPC_PSERIES
954 depends on IMA_ARCH_POLICY
955 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
957 Systems with firmware secure boot enabled need to define security
958 policies to extend secure boot to the OS. This config allows a user
959 to enable OS secure boot on systems that have firmware support for
960 it. If in doubt say N.
962 config PPC_SECVAR_SYSFS
963 bool "Enable sysfs interface for POWER secure variables"
965 depends on PPC_SECURE_BOOT
968 POWER secure variables are managed and controlled by firmware.
969 These variables are exposed to userspace via sysfs to enable
970 read/write operations on these variables. Say Y if you have
971 secure boot enabled and want to expose variables to userspace.
973 config PPC_RTAS_FILTER
974 bool "Enable filtering of RTAS syscalls"
978 The RTAS syscall API has security issues that could be used to
979 compromise system integrity. This option enforces restrictions on the
980 RTAS calls and arguments passed by userspace programs to mitigate
983 Say Y unless you know what you are doing and the filter is causing
995 bool "Support for ISA-bus hardware"
999 Find out whether you have ISA slots on your motherboard. ISA is the
1000 name of a bus system, i.e. the way the CPU talks to the other stuff
1001 inside your box. If you have an Apple machine, say N here; if you
1002 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1003 embedded board, consult your board documentation.
1005 config GENERIC_ISA_DMA
1007 depends on ISA_DMA_API
1010 config PPC_INDIRECT_PCI
1013 default y if 40x || 44x
1023 select ARCH_HAS_DMA_SET_MASK
1024 select PPC_INDIRECT_PCI
1030 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1032 Freescale MPC85xx/MPC86xx power management controller support
1033 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1038 depends on SUSPEND && (44x || 40x)
1040 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1041 It also enables support for two different idle states (idle-wait
1048 bool "Freescale Local Bus support"
1050 Enables reporting of errors from the Freescale local bus
1051 controller. Also contains some common code used by
1052 drivers for specific local bus peripherals.
1056 depends on PPC_83xx || QUICC_ENGINE || CPM2
1058 Freescale General-purpose Timers support
1062 depends on PCI && 8260
1063 select PPC_INDIRECT_PCI
1067 bool "Freescale Embedded SRIO Controller support"
1068 depends on RAPIDIO = y && HAVE_RAPIDIO
1071 Include support for RapidIO controller on Freescale embedded
1072 processors (MPC8548, MPC8641, etc).
1076 config NONSTATIC_KERNEL
1079 menu "Advanced setup"
1082 config ADVANCED_OPTIONS
1083 bool "Prompt for advanced kernel configuration options"
1085 This option will enable prompting for a variety of advanced kernel
1086 configuration options. These options can cause the kernel to not
1087 work if they are set incorrectly, but can be used to optimize certain
1088 aspects of kernel memory management.
1090 Unless you know what you are doing, say N here.
1092 comment "Default settings for advanced configuration options are used"
1093 depends on !ADVANCED_OPTIONS
1095 config LOWMEM_SIZE_BOOL
1096 bool "Set maximum low memory"
1097 depends on ADVANCED_OPTIONS
1099 This option allows you to set the maximum amount of memory which
1100 will be used as "low memory", that is, memory which the kernel can
1101 access directly, without having to set up a kernel virtual mapping.
1102 This can be useful in optimizing the layout of kernel virtual
1105 Say N here unless you know what you are doing.
1108 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1109 default "0x30000000"
1111 config LOWMEM_CAM_NUM_BOOL
1112 bool "Set number of CAMs to use to map low memory"
1113 depends on ADVANCED_OPTIONS && FSL_BOOKE
1115 This option allows you to set the maximum number of CAM slots that
1116 will be used to map low memory. There are a limited number of slots
1117 available and even more limited number that will fit in the L1 MMU.
1118 However, using more entries will allow mapping more low memory. This
1119 can be useful in optimizing the layout of kernel virtual memory.
1121 Say N here unless you know what you are doing.
1123 config LOWMEM_CAM_NUM
1124 depends on FSL_BOOKE
1125 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1126 default 3 if !STRICT_KERNEL_RWX
1127 default 9 if DATA_SHIFT >= 24
1128 default 12 if DATA_SHIFT >= 22
1131 config DYNAMIC_MEMSTART
1132 bool "Enable page aligned dynamic load address for kernel"
1133 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1134 select NONSTATIC_KERNEL
1136 This option enables the kernel to be loaded at any page aligned
1137 physical address. The kernel creates a mapping from KERNELBASE to
1138 the address where the kernel is loaded. The page size here implies
1139 the TLB page size of the mapping for kernel on the particular platform.
1140 Please refer to the init code for finding the TLB page size.
1142 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1143 kernel image, where the only restriction is the page aligned kernel
1144 load address. When this option is enabled, the compile time physical
1145 address CONFIG_PHYSICAL_START is ignored.
1147 This option is overridden by CONFIG_RELOCATABLE
1149 config PAGE_OFFSET_BOOL
1150 bool "Set custom page offset address"
1151 depends on ADVANCED_OPTIONS
1153 This option allows you to set the kernel virtual address at which
1154 the kernel will map low memory. This can be useful in optimizing
1155 the virtual memory layout of the system.
1157 Say N here unless you know what you are doing.
1160 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1161 default "0xc0000000"
1163 config KERNEL_START_BOOL
1164 bool "Set custom kernel base address"
1165 depends on ADVANCED_OPTIONS
1167 This option allows you to set the kernel virtual address at which
1168 the kernel will be loaded. Normally this should match PAGE_OFFSET
1169 however there are times (like kdump) that one might not want them
1172 Say N here unless you know what you are doing.
1175 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1176 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1177 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1178 default "0xc0000000"
1180 config PHYSICAL_START_BOOL
1181 bool "Set physical address where the kernel is loaded"
1182 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1184 This gives the physical address where the kernel is loaded.
1186 Say N here unless you know what you are doing.
1188 config PHYSICAL_START
1189 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1190 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1191 default "0x00000000"
1193 config PHYSICAL_ALIGN
1195 default "0x04000000" if FSL_BOOKE
1197 This value puts the alignment restrictions on physical address
1198 where kernel is loaded and run from. Kernel is compiled for an
1199 address which meets above alignment restriction.
1201 config TASK_SIZE_BOOL
1202 bool "Set custom user task size"
1203 depends on ADVANCED_OPTIONS
1205 This option allows you to set the amount of virtual address space
1206 allocated to user tasks. This can be useful in optimizing the
1207 virtual memory layout of the system.
1209 Say N here unless you know what you are doing.
1212 hex "Size of user task space" if TASK_SIZE_BOOL
1213 default "0x80000000" if PPC_8xx
1214 default "0xb0000000" if PPC_BOOK3S_32
1215 default "0xc0000000"
1219 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1222 default "0xc000000000000000"
1225 default "0xc000000000000000"
1226 config PHYSICAL_START
1228 default "0x00000000"
1234 config PPC_LIB_RHEAP
1237 source "arch/powerpc/kvm/Kconfig"
1239 source "kernel/livepatch/Kconfig"