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)
58 config HAVE_SETUP_PER_CPU_AREA
61 config NEED_PER_CPU_EMBED_FIRST_CHUNK
64 config NEED_PER_CPU_PAGE_FIRST_CHUNK
68 int "Number of virtual interrupt numbers"
72 This defines the number of virtual interrupt numbers the kernel
73 can manage. Virtual interrupt numbers are what you see in
74 /proc/interrupts. If you configure your system to have too few,
75 drivers will fail to load or worse - handle with care.
79 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
84 depends on HARDLOCKUP_DETECTOR
85 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
88 This is a placeholder when the powerpc hardlockup detector
89 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
90 selected via the generic lockup detector menu which is why we
91 have no standalone config option for it here.
93 config STACKTRACE_SUPPORT
97 config TRACE_IRQFLAGS_SUPPORT
101 config LOCKDEP_SUPPORT
105 config GENERIC_LOCKBREAK
108 depends on SMP && PREEMPTION
110 config GENERIC_HWEIGHT
118 # Please keep this list sorted alphabetically.
120 select ARCH_32BIT_OFF_T if PPC32
121 select ARCH_HAS_DEBUG_VIRTUAL
122 select ARCH_HAS_DEVMEM_IS_ALLOWED
123 select ARCH_HAS_ELF_RANDOMIZE
124 select ARCH_HAS_FORTIFY_SOURCE
125 select ARCH_HAS_GCOV_PROFILE_ALL
127 select ARCH_HAS_HUGEPD if HUGETLB_PAGE
128 select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
129 select ARCH_HAS_MMIOWB if PPC64
130 select ARCH_HAS_PHYS_TO_DMA
131 select ARCH_HAS_PMEM_API
132 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
133 select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
134 select ARCH_HAS_PTE_SPECIAL
135 select ARCH_HAS_MEMBARRIER_CALLBACKS
136 select ARCH_HAS_MEMBARRIER_SYNC_CORE
137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
138 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
140 select ARCH_HAS_UACCESS_FLUSHCACHE
141 select ARCH_HAS_COPY_MC if PPC64
142 select ARCH_HAS_UBSAN_SANITIZE_ALL
143 select ARCH_HAVE_NMI_SAFE_CMPXCHG
144 select ARCH_KEEP_MEMBLOCK
145 select ARCH_MIGHT_HAVE_PC_PARPORT
146 select ARCH_MIGHT_HAVE_PC_SERIO
147 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
148 select ARCH_SUPPORTS_ATOMIC_RMW
149 select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64
150 select ARCH_USE_BUILTIN_BSWAP
151 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
152 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
153 select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
154 select ARCH_WANT_IPC_PARSE_VERSION
155 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
156 select ARCH_WANT_LD_ORPHAN_WARN
157 select ARCH_WEAK_RELEASE_ACQUIRE
159 select BUILDTIME_TABLE_SORT
160 select CLONE_BACKWARDS
161 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
162 select DMA_OPS if PPC64
163 select DMA_OPS_BYPASS if PPC64
164 select ARCH_HAS_DMA_MAP_DIRECT if PPC64 && PPC_PSERIES
165 select DYNAMIC_FTRACE if FUNCTION_TRACER
166 select EDAC_ATOMIC_SCRUB
168 select GENERIC_ATOMIC64 if PPC32
169 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
170 select GENERIC_CMOS_UPDATE
171 select GENERIC_CPU_AUTOPROBE
172 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
173 select GENERIC_EARLY_IOREMAP
174 select GENERIC_IRQ_SHOW
175 select GENERIC_IRQ_SHOW_LEVEL
176 select GENERIC_PCI_IOMAP if PCI
177 select GENERIC_SMP_IDLE_THREAD
178 select GENERIC_STRNCPY_FROM_USER
179 select GENERIC_STRNLEN_USER
180 select GENERIC_TIME_VSYSCALL
181 select GENERIC_GETTIMEOFDAY
182 select HAVE_ARCH_AUDITSYSCALL
183 select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
184 select HAVE_ARCH_JUMP_LABEL
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_KGDB
188 select HAVE_ARCH_MMAP_RND_BITS
189 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
190 select HAVE_ARCH_NVRAM_OPS
191 select HAVE_ARCH_SECCOMP_FILTER
192 select HAVE_ARCH_TRACEHOOK
193 select HAVE_ASM_MODVERSIONS
194 select HAVE_C_RECORDMCOUNT
195 select HAVE_CBPF_JIT if !PPC64
196 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
197 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
198 select HAVE_CONTEXT_TRACKING if PPC64
199 select HAVE_DEBUG_KMEMLEAK
200 select HAVE_DEBUG_STACKOVERFLOW
201 select HAVE_DYNAMIC_FTRACE
202 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
203 select HAVE_EBPF_JIT if PPC64
204 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
206 select HAVE_FTRACE_MCOUNT_RECORD
207 select HAVE_FUNCTION_ERROR_INJECTION
208 select HAVE_FUNCTION_GRAPH_TRACER
209 select HAVE_FUNCTION_TRACER
210 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
211 select HAVE_GENERIC_VDSO
212 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_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
225 select HAVE_MOD_ARCH_SPECIFIC
226 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
227 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
228 select HAVE_OPTPROBES if PPC64
229 select HAVE_PERF_EVENTS
230 select HAVE_PERF_EVENTS_NMI if PPC64
231 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
232 select HAVE_PERF_REGS
233 select HAVE_PERF_USER_STACK_DUMP
234 select MMU_GATHER_RCU_TABLE_FREE
235 select MMU_GATHER_PAGE_SIZE
236 select HAVE_REGS_AND_STACK_ACCESS_API
237 select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
238 select HAVE_SOFTIRQ_ON_OWN_STACK
239 select HAVE_SYSCALL_TRACEPOINTS
240 select HAVE_VIRT_CPU_ACCOUNTING
241 select HAVE_IRQ_TIME_ACCOUNTING
243 select IOMMU_HELPER if PPC64
245 select IRQ_FORCED_THREADING
246 select MODULES_USE_ELF_RELA
247 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
248 select NEED_SG_DMA_LENGTH
250 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
251 select OF_EARLY_FLATTREE
252 select OLD_SIGACTION if PPC32
253 select OLD_SIGSUSPEND
254 select PCI_DOMAINS if PCI
255 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
256 select PCI_SYSCALL if PCI
257 select PPC_DAWR if PPC64
260 select SYSCTL_EXCEPTION_TRACE
261 select THREAD_INFO_IN_TASK
262 select VIRT_TO_BUS if !PPC64
264 # Please keep this list sorted alphabetically.
267 config PPC_BARRIER_NOSPEC
270 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
281 bool "Enable support for 32bit binaries"
283 default y if !CPU_LITTLE_ENDIAN
284 select ARCH_WANT_OLD_COMPAT_IPC
285 select COMPAT_OLD_SIGACTION
287 config SYSVIPC_COMPAT
289 depends on COMPAT && SYSVIPC
292 config SCHED_OMIT_FRAME_POINTER
296 config ARCH_MAY_HAVE_PC_FDC
300 config PPC_UDBG_16550
303 config GENERIC_TBSYNC
305 default y if PPC32 && SMP
316 config GENERIC_BUG_RELATIVE_POINTERS
318 depends on GENERIC_BUG
320 config SYS_SUPPORTS_APM_EMULATION
321 default y if PMAC_APM_EMU
327 Used to allow a board to specify it wants an ePAPR compliant wrapper.
329 config DEFAULT_UIMAGE
332 Used to allow a board to specify it wants a uImage built by default
334 config ARCH_HIBERNATION_POSSIBLE
338 config ARCH_SUSPEND_POSSIBLE
340 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
341 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
344 config ARCH_SUSPEND_NONZERO_CPU
346 depends on PPC_POWERNV || PPC_PSERIES
348 config PPC_DCR_NATIVE
356 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
359 config PPC_OF_PLATFORM_PCI
362 depends on PPC64 # not supported on 32 bits yet
364 config ARCH_SUPPORTS_UPROBES
367 config PPC_ADV_DEBUG_REGS
369 depends on 40x || BOOKE
372 config PPC_ADV_DEBUG_IACS
374 depends on PPC_ADV_DEBUG_REGS
378 config PPC_ADV_DEBUG_DACS
380 depends on PPC_ADV_DEBUG_REGS
383 config PPC_ADV_DEBUG_DVCS
385 depends on PPC_ADV_DEBUG_REGS
389 config PPC_ADV_DEBUG_DAC_RANGE
391 depends on PPC_ADV_DEBUG_REGS && 44x
399 default y if PPC_BOOK3E_64
401 config PGTABLE_LEVELS
406 source "arch/powerpc/sysdev/Kconfig"
407 source "arch/powerpc/platforms/Kconfig"
409 menu "Kernel options"
412 bool "High memory support"
416 source "kernel/Kconfig.hz"
418 config HUGETLB_PAGE_SIZE_VARIABLE
420 depends on HUGETLB_PAGE && PPC_BOOK3S_64
423 config MATH_EMULATION
424 bool "Math emulation"
425 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
428 Some PowerPC chips designed for embedded applications do not have
429 a floating-point unit and therefore do not implement the
430 floating-point instructions in the PowerPC instruction set. If you
431 say Y here, the kernel will include code to emulate a floating-point
432 unit, which will allow programs that use floating-point
435 This is also useful to emulate missing (optional) instructions
436 such as fsqrt on cores that do have an FPU but do not implement
437 them (such as Freescale BookE).
440 prompt "Math emulation options"
441 default MATH_EMULATION_FULL
442 depends on MATH_EMULATION
444 config MATH_EMULATION_FULL
445 bool "Emulate all the floating point instructions"
447 Select this option will enable the kernel to support to emulate
448 all the floating point instructions. If your SoC doesn't have
449 a FPU, you should select this.
451 config MATH_EMULATION_HW_UNIMPLEMENTED
452 bool "Just emulate the FPU unimplemented instructions"
454 Select this if you know there does have a hardware FPU on your
455 SoC, but some floating point instructions are not implemented by that.
459 config PPC_TRANSACTIONAL_MEM
460 bool "Transactional Memory support for POWERPC"
461 depends on PPC_BOOK3S_64
466 Support user-mode Transactional Memory on POWERPC.
469 bool "Ultravisor support"
470 depends on KVM_BOOK3S_HV_POSSIBLE
471 depends on DEVICE_PRIVATE
474 This option paravirtualizes the kernel to run in POWER platforms that
475 supports the Protected Execution Facility (PEF). On such platforms,
476 the ultravisor firmware runs at a privilege level above the
481 config LD_HEAD_STUB_CATCH
482 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
485 Very large kernels can cause linker branch stubs to be generated by
486 code in head_64.S, which moves the head text sections out of their
487 specified location. This option can work around the problem.
491 config MPROFILE_KERNEL
492 depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
493 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
496 bool "Support for enabling/disabling CPUs"
497 depends on SMP && (PPC_PSERIES || \
498 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
500 Say Y here to be able to disable and re-enable individual
501 CPUs at runtime on SMP machines.
503 Say N if you are unsure.
505 config PPC_QUEUED_SPINLOCKS
506 bool "Queued spinlocks" if EXPERT
508 default PPC_BOOK3S_64
510 Say Y here to use queued spinlocks which give better scalability and
511 fairness on large SMP and NUMA systems without harming single threaded
514 config ARCH_CPU_PROBE_RELEASE
516 depends on HOTPLUG_CPU
518 config ARCH_ENABLE_MEMORY_HOTPLUG
521 config ARCH_ENABLE_MEMORY_HOTREMOVE
524 config PPC64_SUPPORTS_MEMORY_FAILURE
525 bool "Add support for memory hwpoison"
526 depends on PPC_BOOK3S_64
527 default "y" if PPC_POWERNV
528 select ARCH_SUPPORTS_MEMORY_FAILURE
531 bool "kexec system call"
532 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
535 kexec is a system call that implements the ability to shutdown your
536 current kernel, and to start another kernel. It is like a reboot
537 but it is independent of the system firmware. And like a reboot
538 you can start any kernel with it, not just Linux.
540 The name comes from the similarity to the exec system call.
542 It is an ongoing process to be certain the hardware in a machine
543 is properly shutdown, so do not be surprised if this code does not
544 initially work for you. As of this writing the exact hardware
545 interface is strongly in flux, so no good recommendation can be
549 bool "kexec file based system call"
551 select HAVE_IMA_KEXEC if IMA
556 depends on CRYPTO_SHA256=y
558 This is a new version of the kexec system call. This call is
559 file based and takes in file descriptors as system call arguments
560 for kernel and initramfs as opposed to a list of segments as is the
561 case for the older kexec call.
563 config ARCH_HAS_KEXEC_PURGATORY
567 bool "Build a relocatable kernel"
568 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
569 select NONSTATIC_KERNEL
570 select MODULE_REL_CRCS if MODVERSIONS
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
666 Enable NUMA (Non-Uniform Memory Access) support.
668 The kernel will try to allocate memory used by a CPU on the
669 local memory controller of the CPU and add some more
670 NUMA awareness to the kernel.
676 depends on NEED_MULTIPLE_NODES
678 config USE_PERCPU_NUMA_NODE_ID
682 config HAVE_MEMORYLESS_NODES
686 config ARCH_SELECT_MEMORY_MODEL
690 config ARCH_FLATMEM_ENABLE
692 depends on (PPC64 && !NUMA) || PPC32
694 config ARCH_SPARSEMEM_ENABLE
697 select SPARSEMEM_VMEMMAP_ENABLE
699 config ARCH_SPARSEMEM_DEFAULT
701 depends on PPC_BOOK3S_64
703 config SYS_SUPPORTS_HUGETLBFS
706 config ILLEGAL_POINTER_VALUE
708 # This is roughly half way between the top of user space and the bottom
709 # of kernel space, which seems about as good as we can get.
710 default 0x5deadbeef0000000 if PPC64
713 config ARCH_MEMORY_PROBE
715 depends on MEMORY_HOTPLUG
721 Select the kernel logical page size. Increasing the page size
722 will reduce software overhead at each page boundary, allow
723 hardware prefetch mechanisms to be more effective, and allow
724 larger dma transfers increasing IO efficiency and reducing
725 overhead. However the utilization of memory will increase.
726 For example, each cached file will using a multiple of the
727 page size to hold its contents and the difference between the
728 end of file and the end of page is wasted.
730 Some dedicated systems, such as software raid serving with
731 accelerated calculations, have shown significant increases.
733 If you configure a 64 bit kernel for 64k pages but the
734 processor does not support them, then the kernel will simulate
735 them with 4k pages, loading them on demand, but with the
736 reduced software overhead and larger internal fragmentation.
737 For the 32 bit kernel, a large page option will not be offered
738 unless it is supported by the configured processor.
740 If unsure, choose 4K_PAGES.
744 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
748 depends on 44x || PPC_8xx
752 depends on 44x || PPC_BOOK3S_64
753 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
755 config PPC_256K_PAGES
756 bool "256k page size (Requires non-standard binutils settings)"
757 depends on 44x && !PPC_47x
759 Make the page size 256k.
761 The kernel will only be able to run applications that have been
762 compiled with '-zmax-page-size' set to 256K (the default is 64K) using
763 binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
764 definition from 0x10000 to 0x40000 in older versions.
768 config PPC_PAGE_SHIFT
770 default 18 if PPC_256K_PAGES
771 default 16 if PPC_64K_PAGES
772 default 14 if PPC_16K_PAGES
776 int "Thread shift" if EXPERT
778 default "15" if PPC_256K_PAGES
779 default "14" if PPC64
780 default "14" if KASAN
783 Used to define the stack size. The default is almost always what you
784 want. Only change this if you know what you are doing.
786 config DATA_SHIFT_BOOL
787 bool "Set custom data alignment"
788 depends on ADVANCED_OPTIONS
789 depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC
790 depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX)
792 This option allows you to set the kernel data alignment. When
793 RAM is mapped by blocks, the alignment needs to fit the size and
794 number of possible blocks. The default should be OK for most configs.
796 Say N here unless you know what you are doing.
799 int "Data shift" if DATA_SHIFT_BOOL
800 default 24 if STRICT_KERNEL_RWX && PPC64
801 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
802 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
803 default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
804 default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
805 default 23 if STRICT_KERNEL_RWX && PPC_8xx
806 default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
807 default 19 if DEBUG_PAGEALLOC && PPC_8xx
808 default PPC_PAGE_SHIFT
810 On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
811 Smaller is the alignment, greater is the number of necessary DBATs.
813 On 8xx, large pages (512kb or 8M) are used to map kernel linear
814 memory. Aligning to 8M reduces TLB misses as only 8M pages are used
815 in that case. If PIN_TLB is selected, it must be aligned to 8M as
816 8M pages will be pinned.
818 config FORCE_MAX_ZONEORDER
819 int "Maximum zone order"
820 range 8 9 if PPC64 && PPC_64K_PAGES
821 default "9" if PPC64 && PPC_64K_PAGES
822 range 13 13 if PPC64 && !PPC_64K_PAGES
823 default "13" if PPC64 && !PPC_64K_PAGES
824 range 9 64 if PPC32 && PPC_16K_PAGES
825 default "9" if PPC32 && PPC_16K_PAGES
826 range 7 64 if PPC32 && PPC_64K_PAGES
827 default "7" if PPC32 && PPC_64K_PAGES
828 range 5 64 if PPC32 && PPC_256K_PAGES
829 default "5" if PPC32 && PPC_256K_PAGES
833 The kernel memory allocator divides physically contiguous memory
834 blocks into "zones", where each zone is a power of two number of
835 pages. This option selects the largest power of two that the kernel
836 keeps in the memory allocator. If you need to allocate very large
837 blocks of physically contiguous memory, then you may need to
840 This config option is actually maximum order plus one. For example,
841 a value of 11 means that the largest free memory block is 2^10 pages.
843 The page size is not necessarily 4KB. For example, on 64-bit
844 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
845 this in mind when choosing a value for this option.
847 config PPC_SUBPAGE_PROT
848 bool "Support setting protections for 4k subpages (subpage_prot syscall)"
850 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
852 This option adds support for system call to allow user programs
853 to set access permissions (read/write, readonly, or no access)
854 on the 4k subpages of each 64k page.
856 If unsure, say N here.
858 config PPC_PROT_SAO_LPAR
859 bool "Support PROT_SAO mappings in LPARs"
860 depends on PPC_BOOK3S_64
862 This option adds support for PROT_SAO mappings from userspace
863 inside LPARs on supported CPUs.
865 This may cause issues when performing guest migration from
866 a CPU that supports SAO to one that does not.
868 If unsure, say N here.
870 config PPC_COPRO_BASE
874 bool "SMT (Hyperthreading) scheduler support"
875 depends on PPC64 && SMP
877 SMT scheduler support improves the CPU scheduler's decision making
878 when dealing with POWER5 cpus at a cost of slightly increased
879 overhead in some places. If unsure say N here.
881 config PPC_DENORMALISATION
882 bool "PowerPC denormalisation exception handling"
883 depends on PPC_BOOK3S_64
884 default "y" if PPC_POWERNV
886 Add support for handling denormalisation of single precision
887 values. Useful for bare metal only. If unsure say Y here.
890 string "Initial kernel command string"
893 On some platforms, there is currently no way for the boot loader to
894 pass arguments to the kernel. For these platforms, you can supply
895 some command-line options at build time by entering them here. In
896 most cases you will need to specify the root device here.
899 prompt "Kernel command line type" if CMDLINE != ""
900 default CMDLINE_FROM_BOOTLOADER
902 config CMDLINE_FROM_BOOTLOADER
903 bool "Use bootloader kernel arguments if available"
905 Uses the command-line options passed by the boot loader. If
906 the boot loader doesn't provide any, the default kernel command
907 string provided in CMDLINE will be used.
909 config CMDLINE_EXTEND
910 bool "Extend bootloader kernel arguments"
912 The command-line arguments provided by the boot loader will be
913 appended to the default kernel command string.
916 bool "Always use the default kernel command string"
918 Always use the default kernel command string, even if the boot
919 loader passes other arguments to the kernel.
920 This is useful if you cannot or don't want to change the
921 command-line options your boot loader passes to the kernel.
926 string "Additional default image types"
928 List additional targets to be built by the bootwrapper here (separated
929 by spaces). This is useful for targets that depend of device tree
930 files in the .dts directory.
932 Targets in this list will be build as part of the default build
933 target, or when the user does a 'make zImage' or a
934 'make zImage.initrd'.
936 If unsure, leave blank
938 config ARCH_WANTS_FREEZER_CONTROL
942 source "kernel/power/Kconfig"
945 prompt "PowerPC Memory Protection Keys"
947 depends on PPC_BOOK3S_64
948 select ARCH_USES_HIGH_VMA_FLAGS
949 select ARCH_HAS_PKEYS
951 Memory Protection Keys provides a mechanism for enforcing
952 page-based protections, but without requiring modification of the
953 page tables when an application changes protection domains.
955 For details, see Documentation/core-api/protection-keys.rst
959 config PPC_SECURE_BOOT
960 prompt "Enable secure boot support"
962 depends on PPC_POWERNV || PPC_PSERIES
963 depends on IMA_ARCH_POLICY
964 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
966 Systems with firmware secure boot enabled need to define security
967 policies to extend secure boot to the OS. This config allows a user
968 to enable OS secure boot on systems that have firmware support for
969 it. If in doubt say N.
971 config PPC_SECVAR_SYSFS
972 bool "Enable sysfs interface for POWER secure variables"
974 depends on PPC_SECURE_BOOT
977 POWER secure variables are managed and controlled by firmware.
978 These variables are exposed to userspace via sysfs to enable
979 read/write operations on these variables. Say Y if you have
980 secure boot enabled and want to expose variables to userspace.
982 config PPC_RTAS_FILTER
983 bool "Enable filtering of RTAS syscalls"
987 The RTAS syscall API has security issues that could be used to
988 compromise system integrity. This option enforces restrictions on the
989 RTAS calls and arguments passed by userspace programs to mitigate
992 Say Y unless you know what you are doing and the filter is causing
1004 bool "Support for ISA-bus hardware"
1008 Find out whether you have ISA slots on your motherboard. ISA is the
1009 name of a bus system, i.e. the way the CPU talks to the other stuff
1010 inside your box. If you have an Apple machine, say N here; if you
1011 have an IBM RS/6000 or pSeries machine, say Y. If you have an
1012 embedded board, consult your board documentation.
1014 config GENERIC_ISA_DMA
1016 depends on ISA_DMA_API
1019 config PPC_INDIRECT_PCI
1022 default y if 40x || 44x
1032 select ARCH_HAS_DMA_SET_MASK
1033 select PPC_INDIRECT_PCI
1039 depends on SUSPEND && (PPC_85xx || PPC_86xx)
1041 Freescale MPC85xx/MPC86xx power management controller support
1042 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
1047 depends on SUSPEND && (44x || 40x)
1049 PPC4xx Clock Power Management (CPM) support (suspend/resume).
1050 It also enables support for two different idle states (idle-wait
1057 bool "Freescale Local Bus support"
1059 Enables reporting of errors from the Freescale local bus
1060 controller. Also contains some common code used by
1061 drivers for specific local bus peripherals.
1065 depends on PPC_83xx || QUICC_ENGINE || CPM2
1067 Freescale General-purpose Timers support
1071 depends on PCI && 8260
1072 select PPC_INDIRECT_PCI
1076 bool "Freescale Embedded SRIO Controller support"
1077 depends on RAPIDIO = y && HAVE_RAPIDIO
1080 Include support for RapidIO controller on Freescale embedded
1081 processors (MPC8548, MPC8641, etc).
1085 config NONSTATIC_KERNEL
1088 menu "Advanced setup"
1091 config ADVANCED_OPTIONS
1092 bool "Prompt for advanced kernel configuration options"
1094 This option will enable prompting for a variety of advanced kernel
1095 configuration options. These options can cause the kernel to not
1096 work if they are set incorrectly, but can be used to optimize certain
1097 aspects of kernel memory management.
1099 Unless you know what you are doing, say N here.
1101 comment "Default settings for advanced configuration options are used"
1102 depends on !ADVANCED_OPTIONS
1104 config LOWMEM_SIZE_BOOL
1105 bool "Set maximum low memory"
1106 depends on ADVANCED_OPTIONS
1108 This option allows you to set the maximum amount of memory which
1109 will be used as "low memory", that is, memory which the kernel can
1110 access directly, without having to set up a kernel virtual mapping.
1111 This can be useful in optimizing the layout of kernel virtual
1114 Say N here unless you know what you are doing.
1117 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1118 default "0x30000000"
1120 config LOWMEM_CAM_NUM_BOOL
1121 bool "Set number of CAMs to use to map low memory"
1122 depends on ADVANCED_OPTIONS && FSL_BOOKE
1124 This option allows you to set the maximum number of CAM slots that
1125 will be used to map low memory. There are a limited number of slots
1126 available and even more limited number that will fit in the L1 MMU.
1127 However, using more entries will allow mapping more low memory. This
1128 can be useful in optimizing the layout of kernel virtual memory.
1130 Say N here unless you know what you are doing.
1132 config LOWMEM_CAM_NUM
1133 depends on FSL_BOOKE
1134 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1137 config DYNAMIC_MEMSTART
1138 bool "Enable page aligned dynamic load address for kernel"
1139 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1140 select NONSTATIC_KERNEL
1142 This option enables the kernel to be loaded at any page aligned
1143 physical address. The kernel creates a mapping from KERNELBASE to
1144 the address where the kernel is loaded. The page size here implies
1145 the TLB page size of the mapping for kernel on the particular platform.
1146 Please refer to the init code for finding the TLB page size.
1148 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1149 kernel image, where the only restriction is the page aligned kernel
1150 load address. When this option is enabled, the compile time physical
1151 address CONFIG_PHYSICAL_START is ignored.
1153 This option is overridden by CONFIG_RELOCATABLE
1155 config PAGE_OFFSET_BOOL
1156 bool "Set custom page offset address"
1157 depends on ADVANCED_OPTIONS
1159 This option allows you to set the kernel virtual address at which
1160 the kernel will map low memory. This can be useful in optimizing
1161 the virtual memory layout of the system.
1163 Say N here unless you know what you are doing.
1166 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1167 default "0xc0000000"
1169 config KERNEL_START_BOOL
1170 bool "Set custom kernel base address"
1171 depends on ADVANCED_OPTIONS
1173 This option allows you to set the kernel virtual address at which
1174 the kernel will be loaded. Normally this should match PAGE_OFFSET
1175 however there are times (like kdump) that one might not want them
1178 Say N here unless you know what you are doing.
1181 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1182 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1183 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1184 default "0xc0000000"
1186 config PHYSICAL_START_BOOL
1187 bool "Set physical address where the kernel is loaded"
1188 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1190 This gives the physical address where the kernel is loaded.
1192 Say N here unless you know what you are doing.
1194 config PHYSICAL_START
1195 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1196 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1197 default "0x00000000"
1199 config PHYSICAL_ALIGN
1201 default "0x04000000" if FSL_BOOKE
1203 This value puts the alignment restrictions on physical address
1204 where kernel is loaded and run from. Kernel is compiled for an
1205 address which meets above alignment restriction.
1207 config TASK_SIZE_BOOL
1208 bool "Set custom user task size"
1209 depends on ADVANCED_OPTIONS
1211 This option allows you to set the amount of virtual address space
1212 allocated to user tasks. This can be useful in optimizing the
1213 virtual memory layout of the system.
1215 Say N here unless you know what you are doing.
1218 hex "Size of user task space" if TASK_SIZE_BOOL
1219 default "0x80000000" if PPC_8xx
1220 default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
1221 default "0xc0000000"
1225 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1228 default "0xc000000000000000"
1231 default "0xc000000000000000"
1232 config PHYSICAL_START
1234 default "0x00000000"
1240 config PPC_LIB_RHEAP
1243 source "arch/powerpc/kvm/Kconfig"
1245 source "kernel/livepatch/Kconfig"