1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
62 config HAVE_SETUP_PER_CPU_AREA
65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
69 int "Number of virtual interrupt numbers"
73 This defines the number of virtual interrupt numbers the kernel
74 can manage. Virtual interrupt numbers are what you see in
75 /proc/interrupts. If you configure your system to have too few,
76 drivers will fail to load or worse - handle with care.
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
89 This is a placeholder when the powerpc hardlockup detector
90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
91 seleted via the generic lockup detector menu which is why we
92 have no standalone config option for it here.
94 config STACKTRACE_SUPPORT
98 config TRACE_IRQFLAGS_SUPPORT
102 config LOCKDEP_SUPPORT
106 config RWSEM_GENERIC_SPINLOCK
109 config RWSEM_XCHGADD_ALGORITHM
113 config GENERIC_LOCKBREAK
116 depends on SMP && PREEMPT
118 config GENERIC_HWEIGHT
122 config ARCH_HAS_DMA_SET_COHERENT_MASK
129 # Please keep this list sorted alphabetically.
131 select ARCH_HAS_DEBUG_VIRTUAL
132 select ARCH_HAS_DEVMEM_IS_ALLOWED
133 select ARCH_HAS_DMA_SET_COHERENT_MASK
134 select ARCH_HAS_ELF_RANDOMIZE
135 select ARCH_HAS_FORTIFY_SOURCE
136 select ARCH_HAS_GCOV_PROFILE_ALL
137 select ARCH_HAS_PHYS_TO_DMA
138 select ARCH_HAS_PMEM_API if PPC64
139 select ARCH_HAS_PTE_SPECIAL
140 select ARCH_HAS_MEMBARRIER_CALLBACKS
141 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
142 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
143 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
144 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
145 select ARCH_HAS_UBSAN_SANITIZE_ALL
146 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
147 select ARCH_HAVE_NMI_SAFE_CMPXCHG
148 select ARCH_MIGHT_HAVE_PC_PARPORT
149 select ARCH_MIGHT_HAVE_PC_SERIO
150 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
151 select ARCH_SUPPORTS_ATOMIC_RMW
152 select ARCH_USE_BUILTIN_BSWAP
153 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
154 select ARCH_WANT_IPC_PARSE_VERSION
155 select ARCH_WEAK_RELEASE_ACQUIRE
157 select BUILDTIME_EXTABLE_SORT
158 select CLONE_BACKWARDS
159 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
160 select DYNAMIC_FTRACE if FUNCTION_TRACER
161 select EDAC_ATOMIC_SCRUB
163 select GENERIC_ATOMIC64 if PPC32
164 select GENERIC_CLOCKEVENTS
165 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
166 select GENERIC_CMOS_UPDATE
167 select GENERIC_CPU_AUTOPROBE
168 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
169 select GENERIC_IRQ_SHOW
170 select GENERIC_IRQ_SHOW_LEVEL
171 select GENERIC_PCI_IOMAP if PCI
172 select GENERIC_SMP_IDLE_THREAD
173 select GENERIC_STRNCPY_FROM_USER
174 select GENERIC_STRNLEN_USER
175 select GENERIC_TIME_VSYSCALL
176 select HAVE_ARCH_AUDITSYSCALL
177 select HAVE_ARCH_JUMP_LABEL
178 select HAVE_ARCH_KGDB
179 select HAVE_ARCH_MMAP_RND_BITS
180 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
181 select HAVE_ARCH_SECCOMP_FILTER
182 select HAVE_ARCH_TRACEHOOK
183 select HAVE_CBPF_JIT if !PPC64
184 select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
185 select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
186 select HAVE_CONTEXT_TRACKING if PPC64
187 select HAVE_DEBUG_KMEMLEAK
188 select HAVE_DEBUG_STACKOVERFLOW
189 select HAVE_DYNAMIC_FTRACE
190 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
191 select HAVE_EBPF_JIT if PPC64
192 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
193 select HAVE_FTRACE_MCOUNT_RECORD
194 select HAVE_FUNCTION_ERROR_INJECTION
195 select HAVE_FUNCTION_GRAPH_TRACER
196 select HAVE_FUNCTION_TRACER
197 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
198 select HAVE_GENERIC_GUP
199 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
201 select HAVE_IOREMAP_PROT
202 select HAVE_IRQ_EXIT_ON_IRQ_STACK
203 select HAVE_KERNEL_GZIP
204 select HAVE_KERNEL_XZ if PPC_BOOK3S
206 select HAVE_KPROBES_ON_FTRACE
207 select HAVE_KRETPROBES
208 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
209 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
210 select HAVE_MEMBLOCK_NODE_MAP
211 select HAVE_MOD_ARCH_SPECIFIC
212 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
213 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
215 select HAVE_OPTPROBES if PPC64
216 select HAVE_PERF_EVENTS
217 select HAVE_PERF_EVENTS_NMI if PPC64
218 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
219 select HAVE_PERF_REGS
220 select HAVE_PERF_USER_STACK_DUMP
221 select HAVE_RCU_TABLE_FREE if SMP
222 select HAVE_REGS_AND_STACK_ACCESS_API
223 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
224 select HAVE_SYSCALL_TRACEPOINTS
225 select HAVE_VIRT_CPU_ACCOUNTING
226 select HAVE_IRQ_TIME_ACCOUNTING
228 select IOMMU_HELPER if PPC64
230 select IRQ_FORCED_THREADING
231 select MODULES_USE_ELF_RELA
232 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
233 select NEED_SG_DMA_LENGTH
235 select OF_EARLY_FLATTREE
236 select OF_RESERVED_MEM
237 select OLD_SIGACTION if PPC32
238 select OLD_SIGSUSPEND
239 select PCI_DOMAINS if PCI
240 select PCI_SYSCALL if PCI
243 select SYSCTL_EXCEPTION_TRACE
244 select VIRT_TO_BUS if !PPC64
246 # Please keep this list sorted alphabetically.
249 config PPC_BARRIER_NOSPEC
252 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
268 select COMPAT_BINFMT_ELF
269 select ARCH_WANT_OLD_COMPAT_IPC
270 select COMPAT_OLD_SIGACTION
272 config SYSVIPC_COMPAT
274 depends on COMPAT && SYSVIPC
277 # All PPC32s use generic nvram driver through ppc_md
282 config SCHED_OMIT_FRAME_POINTER
286 config ARCH_MAY_HAVE_PC_FDC
290 config PPC_UDBG_16550
293 config GENERIC_TBSYNC
295 default y if PPC32 && SMP
306 config SYS_SUPPORTS_APM_EMULATION
307 default y if PMAC_APM_EMU
313 Used to allow a board to specify it wants an ePAPR compliant wrapper.
315 config DEFAULT_UIMAGE
318 Used to allow a board to specify it wants a uImage built by default
320 config ARCH_HIBERNATION_POSSIBLE
324 config ARCH_SUSPEND_POSSIBLE
326 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
327 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
330 config PPC_DCR_NATIVE
338 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
341 config PPC_OF_PLATFORM_PCI
344 depends on PPC64 # not supported on 32 bits yet
346 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
347 depends on PPC32 || PPC_BOOK3S_64
350 config ARCH_SUPPORTS_UPROBES
353 config PPC_ADV_DEBUG_REGS
355 depends on 40x || BOOKE
358 config PPC_ADV_DEBUG_IACS
360 depends on PPC_ADV_DEBUG_REGS
364 config PPC_ADV_DEBUG_DACS
366 depends on PPC_ADV_DEBUG_REGS
369 config PPC_ADV_DEBUG_DVCS
371 depends on PPC_ADV_DEBUG_REGS
375 config PPC_ADV_DEBUG_DAC_RANGE
377 depends on PPC_ADV_DEBUG_REGS && 44x
382 default y if PPC_BOOK3E_64
384 config PGTABLE_LEVELS
387 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
390 source "arch/powerpc/sysdev/Kconfig"
391 source "arch/powerpc/platforms/Kconfig"
393 menu "Kernel options"
396 bool "High memory support"
399 source "kernel/Kconfig.hz"
401 config HUGETLB_PAGE_SIZE_VARIABLE
403 depends on HUGETLB_PAGE
406 config MATH_EMULATION
407 bool "Math emulation"
408 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
410 Some PowerPC chips designed for embedded applications do not have
411 a floating-point unit and therefore do not implement the
412 floating-point instructions in the PowerPC instruction set. If you
413 say Y here, the kernel will include code to emulate a floating-point
414 unit, which will allow programs that use floating-point
417 This is also useful to emulate missing (optional) instructions
418 such as fsqrt on cores that do have an FPU but do not implement
419 them (such as Freescale BookE).
422 prompt "Math emulation options"
423 default MATH_EMULATION_FULL
424 depends on MATH_EMULATION
426 config MATH_EMULATION_FULL
427 bool "Emulate all the floating point instructions"
429 Select this option will enable the kernel to support to emulate
430 all the floating point instructions. If your SoC doesn't have
431 a FPU, you should select this.
433 config MATH_EMULATION_HW_UNIMPLEMENTED
434 bool "Just emulate the FPU unimplemented instructions"
436 Select this if you know there does have a hardware FPU on your
437 SoC, but some floating point instructions are not implemented by that.
441 config PPC_TRANSACTIONAL_MEM
442 bool "Transactional Memory support for POWERPC"
443 depends on PPC_BOOK3S_64
448 Support user-mode Transactional Memory on POWERPC.
450 config LD_HEAD_STUB_CATCH
451 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
454 Very large kernels can cause linker branch stubs to be generated by
455 code in head_64.S, which moves the head text sections out of their
456 specified location. This option can work around the problem.
460 config MPROFILE_KERNEL
461 depends on PPC64 && CPU_LITTLE_ENDIAN
462 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
465 bool "Support for enabling/disabling CPUs"
466 depends on SMP && (PPC_PSERIES || \
467 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
469 Say Y here to be able to disable and re-enable individual
470 CPUs at runtime on SMP machines.
472 Say N if you are unsure.
474 config ARCH_CPU_PROBE_RELEASE
476 depends on HOTPLUG_CPU
478 config ARCH_ENABLE_MEMORY_HOTPLUG
481 config ARCH_HAS_WALK_MEMORY
484 config ARCH_ENABLE_MEMORY_HOTREMOVE
487 config PPC64_SUPPORTS_MEMORY_FAILURE
488 bool "Add support for memory hwpoison"
489 depends on PPC_BOOK3S_64
490 default "y" if PPC_POWERNV
491 select ARCH_SUPPORTS_MEMORY_FAILURE
494 bool "kexec system call"
495 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
498 kexec is a system call that implements the ability to shutdown your
499 current kernel, and to start another kernel. It is like a reboot
500 but it is independent of the system firmware. And like a reboot
501 you can start any kernel with it, not just Linux.
503 The name comes from the similarity to the exec system call.
505 It is an ongoing process to be certain the hardware in a machine
506 is properly shutdown, so do not be surprised if this code does not
507 initially work for you. As of this writing the exact hardware
508 interface is strongly in flux, so no good recommendation can be
512 bool "kexec file based system call"
514 select HAVE_IMA_KEXEC
518 depends on CRYPTO_SHA256=y
520 This is a new version of the kexec system call. This call is
521 file based and takes in file descriptors as system call arguments
522 for kernel and initramfs as opposed to a list of segments as is the
523 case for the older kexec call.
525 config ARCH_HAS_KEXEC_PURGATORY
529 bool "Build a relocatable kernel"
530 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
531 select NONSTATIC_KERNEL
532 select MODULE_REL_CRCS if MODVERSIONS
534 This builds a kernel image that is capable of running at the
535 location the kernel is loaded at. For ppc32, there is no any
536 alignment restrictions, and this feature is a superset of
537 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
538 16k-aligned base address. The kernel is linked as a
539 position-independent executable (PIE) and contains dynamic relocations
540 which are processed early in the bootup process.
542 One use is for the kexec on panic case where the recovery kernel
543 must live at a different physical address than the primary
546 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
547 it has been loaded at and the compile time physical addresses
548 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
549 setting can still be useful to bootwrappers that need to know the
550 load address of the kernel (eg. u-boot/mkimage).
552 config RELOCATABLE_TEST
553 bool "Test relocatable kernel"
554 depends on (PPC64 && RELOCATABLE)
556 This runs the relocatable kernel at the address it was initially
557 loaded at, which tends to be non-zero and therefore test the
561 bool "Build a dump capture kernel"
562 depends on PPC64 || PPC_BOOK3S_32 || FSL_BOOKE || (44x && !SMP)
563 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
565 Build a kernel suitable for use as a dump capture kernel.
566 The same kernel binary can be used as production kernel and dump
570 bool "Firmware-assisted dump"
571 depends on PPC64 && PPC_RTAS
575 A robust mechanism to get reliable kernel crash dump with
576 assistance from firmware. This approach does not use kexec,
577 instead firmware assists in booting the capture kernel
578 while preserving memory contents. Firmware-assisted dump
579 is meant to be a kdump replacement offering robustness and
580 speed not possible without system firmware assistance.
585 bool "Distribute interrupts on all CPUs by default"
588 This option gives the kernel permission to distribute IRQs across
589 multiple CPUs. Saying N here will route all IRQs to the first
590 CPU. Generally saying Y is safe, although some problems have been
591 reported with SMP Power Macintoshes with this option enabled.
596 default y if SMP && PPC_PSERIES
602 depends on NEED_MULTIPLE_NODES
604 config USE_PERCPU_NUMA_NODE_ID
608 config HAVE_MEMORYLESS_NODES
612 config ARCH_SELECT_MEMORY_MODEL
616 config ARCH_FLATMEM_ENABLE
618 depends on (PPC64 && !NUMA) || PPC32
620 config ARCH_SPARSEMEM_ENABLE
623 select SPARSEMEM_VMEMMAP_ENABLE
625 config ARCH_SPARSEMEM_DEFAULT
627 depends on PPC_BOOK3S_64
629 config SYS_SUPPORTS_HUGETLBFS
632 config ILLEGAL_POINTER_VALUE
634 # This is roughly half way between the top of user space and the bottom
635 # of kernel space, which seems about as good as we can get.
636 default 0x5deadbeef0000000 if PPC64
639 config ARCH_MEMORY_PROBE
641 depends on MEMORY_HOTPLUG
643 # Some NUMA nodes have memory ranges that span
644 # other nodes. Even though a pfn is valid and
645 # between a node's start and end pfns, it may not
646 # reside on that node. See memmap_init_zone()
648 config NODES_SPAN_OTHER_NODES
650 depends on NEED_MULTIPLE_NODES
653 bool "Using standard binutils settings"
657 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
658 Note, that kernel will be able to run only those applications,
659 which had been compiled using binutils later than 2.17.50.0.3 with
660 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
661 the older binutils, you can patch them with a trivial patch, which
662 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
668 Select the kernel logical page size. Increasing the page size
669 will reduce software overhead at each page boundary, allow
670 hardware prefetch mechanisms to be more effective, and allow
671 larger dma transfers increasing IO efficiency and reducing
672 overhead. However the utilization of memory will increase.
673 For example, each cached file will using a multiple of the
674 page size to hold its contents and the difference between the
675 end of file and the end of page is wasted.
677 Some dedicated systems, such as software raid serving with
678 accelerated calculations, have shown significant increases.
680 If you configure a 64 bit kernel for 64k pages but the
681 processor does not support them, then the kernel will simulate
682 them with 4k pages, loading them on demand, but with the
683 reduced software overhead and larger internal fragmentation.
684 For the 32 bit kernel, a large page option will not be offered
685 unless it is supported by the configured processor.
687 If unsure, choose 4K_PAGES.
691 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
695 depends on 44x || PPC_8xx
699 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
700 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
702 config PPC_256K_PAGES
703 bool "256k page size"
704 depends on 44x && !STDBINUTILS
706 Make the page size 256k.
708 As the ELF standard only requires alignment to support page
709 sizes up to 64k, you will need to compile all of your user
710 space applications with a non-standard binutils settings
711 (see the STDBINUTILS description for details).
713 Say N unless you know what you are doing.
718 int "Thread shift" if EXPERT
720 default "15" if PPC_256K_PAGES
721 default "14" if PPC64
724 Used to define the stack size. The default is almost always what you
725 want. Only change this if you know what you are doing.
727 config FORCE_MAX_ZONEORDER
728 int "Maximum zone order"
729 range 8 9 if PPC64 && PPC_64K_PAGES
730 default "9" if PPC64 && PPC_64K_PAGES
731 range 13 13 if PPC64 && !PPC_64K_PAGES
732 default "13" if PPC64 && !PPC_64K_PAGES
733 range 9 64 if PPC32 && PPC_16K_PAGES
734 default "9" if PPC32 && PPC_16K_PAGES
735 range 7 64 if PPC32 && PPC_64K_PAGES
736 default "7" if PPC32 && PPC_64K_PAGES
737 range 5 64 if PPC32 && PPC_256K_PAGES
738 default "5" if PPC32 && PPC_256K_PAGES
742 The kernel memory allocator divides physically contiguous memory
743 blocks into "zones", where each zone is a power of two number of
744 pages. This option selects the largest power of two that the kernel
745 keeps in the memory allocator. If you need to allocate very large
746 blocks of physically contiguous memory, then you may need to
749 This config option is actually maximum order plus one. For example,
750 a value of 11 means that the largest free memory block is 2^10 pages.
752 The page size is not necessarily 4KB. For example, on 64-bit
753 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
754 this in mind when choosing a value for this option.
756 config PPC_SUBPAGE_PROT
757 bool "Support setting protections for 4k subpages"
758 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
760 This option adds support for a system call to allow user programs
761 to set access permissions (read/write, readonly, or no access)
762 on the 4k subpages of each 64k page.
764 config PPC_COPRO_BASE
768 bool "SMT (Hyperthreading) scheduler support"
769 depends on PPC64 && SMP
771 SMT scheduler support improves the CPU scheduler's decision making
772 when dealing with POWER5 cpus at a cost of slightly increased
773 overhead in some places. If unsure say N here.
775 config PPC_DENORMALISATION
776 bool "PowerPC denormalisation exception handling"
777 depends on PPC_BOOK3S_64
778 default "y" if PPC_POWERNV
780 Add support for handling denormalisation of single precision
781 values. Useful for bare metal only. If unsure say Y here.
784 bool "Default bootloader kernel arguments"
787 string "Initial kernel command string"
788 depends on CMDLINE_BOOL
789 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
791 On some platforms, there is currently no way for the boot loader to
792 pass arguments to the kernel. For these platforms, you can supply
793 some command-line options at build time by entering them here. In
794 most cases you will need to specify the root device here.
797 bool "Always use the default kernel command string"
798 depends on CMDLINE_BOOL
800 Always use the default kernel command string, even if the boot
801 loader passes other arguments to the kernel.
802 This is useful if you cannot or don't want to change the
803 command-line options your boot loader passes to the kernel.
806 string "Additional default image types"
808 List additional targets to be built by the bootwrapper here (separated
809 by spaces). This is useful for targets that depend of device tree
810 files in the .dts directory.
812 Targets in this list will be build as part of the default build
813 target, or when the user does a 'make zImage' or a
814 'make zImage.initrd'.
816 If unsure, leave blank
818 config ARCH_WANTS_FREEZER_CONTROL
822 source "kernel/power/Kconfig"
825 bool "Enable seccomp to safely compute untrusted bytecode"
829 This kernel feature is useful for number crunching applications
830 that may need to compute untrusted bytecode during their
831 execution. By using pipes or other transports made available to
832 the process as file descriptors supporting the read/write
833 syscalls, it's possible to isolate those applications in
834 their own address space using seccomp. Once seccomp is
835 enabled via /proc/<pid>/seccomp, it cannot be disabled
836 and the task is only allowed to execute a few safe syscalls
837 defined by each seccomp mode.
839 If unsure, say Y. Only embedded should say N here.
842 prompt "PowerPC Memory Protection Keys"
844 depends on PPC_BOOK3S_64
845 select ARCH_USES_HIGH_VMA_FLAGS
846 select ARCH_HAS_PKEYS
848 Memory Protection Keys provides a mechanism for enforcing
849 page-based protections, but without requiring modification of the
850 page tables when an application changes protection domains.
852 For details, see Documentation/vm/protection-keys.rst
865 bool "Support for ISA-bus hardware"
869 Find out whether you have ISA slots on your motherboard. ISA is the
870 name of a bus system, i.e. the way the CPU talks to the other stuff
871 inside your box. If you have an Apple machine, say N here; if you
872 have an IBM RS/6000 or pSeries machine, say Y. If you have an
873 embedded board, consult your board documentation.
875 config GENERIC_ISA_DMA
877 depends on ISA_DMA_API
880 config PPC_INDIRECT_PCI
883 default y if 40x || 44x
893 select PPC_INDIRECT_PCI
899 depends on SUSPEND && (PPC_85xx || PPC_86xx)
901 Freescale MPC85xx/MPC86xx power management controller support
902 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
907 depends on SUSPEND && (44x || 40x)
909 PPC4xx Clock Power Management (CPM) support (suspend/resume).
910 It also enables support for two different idle states (idle-wait
917 bool "Freescale Local Bus support"
919 Enables reporting of errors from the Freescale local bus
920 controller. Also contains some common code used by
921 drivers for specific local bus peripherals.
925 depends on PPC_83xx || QUICC_ENGINE || CPM2
927 Freescale General-purpose Timers support
931 depends on PCI && 8260
932 select PPC_INDIRECT_PCI
936 bool "Freescale Embedded SRIO Controller support"
937 depends on RAPIDIO = y && HAVE_RAPIDIO
940 Include support for RapidIO controller on Freescale embedded
941 processors (MPC8548, MPC8641, etc).
945 config NONSTATIC_KERNEL
948 menu "Advanced setup"
951 config ADVANCED_OPTIONS
952 bool "Prompt for advanced kernel configuration options"
954 This option will enable prompting for a variety of advanced kernel
955 configuration options. These options can cause the kernel to not
956 work if they are set incorrectly, but can be used to optimize certain
957 aspects of kernel memory management.
959 Unless you know what you are doing, say N here.
961 comment "Default settings for advanced configuration options are used"
962 depends on !ADVANCED_OPTIONS
964 config LOWMEM_SIZE_BOOL
965 bool "Set maximum low memory"
966 depends on ADVANCED_OPTIONS
968 This option allows you to set the maximum amount of memory which
969 will be used as "low memory", that is, memory which the kernel can
970 access directly, without having to set up a kernel virtual mapping.
971 This can be useful in optimizing the layout of kernel virtual
974 Say N here unless you know what you are doing.
977 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
980 config LOWMEM_CAM_NUM_BOOL
981 bool "Set number of CAMs to use to map low memory"
982 depends on ADVANCED_OPTIONS && FSL_BOOKE
984 This option allows you to set the maximum number of CAM slots that
985 will be used to map low memory. There are a limited number of slots
986 available and even more limited number that will fit in the L1 MMU.
987 However, using more entries will allow mapping more low memory. This
988 can be useful in optimizing the layout of kernel virtual memory.
990 Say N here unless you know what you are doing.
992 config LOWMEM_CAM_NUM
994 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
997 config DYNAMIC_MEMSTART
998 bool "Enable page aligned dynamic load address for kernel"
999 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1000 select NONSTATIC_KERNEL
1002 This option enables the kernel to be loaded at any page aligned
1003 physical address. The kernel creates a mapping from KERNELBASE to
1004 the address where the kernel is loaded. The page size here implies
1005 the TLB page size of the mapping for kernel on the particular platform.
1006 Please refer to the init code for finding the TLB page size.
1008 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1009 kernel image, where the only restriction is the page aligned kernel
1010 load address. When this option is enabled, the compile time physical
1011 address CONFIG_PHYSICAL_START is ignored.
1013 This option is overridden by CONFIG_RELOCATABLE
1015 config PAGE_OFFSET_BOOL
1016 bool "Set custom page offset address"
1017 depends on ADVANCED_OPTIONS
1019 This option allows you to set the kernel virtual address at which
1020 the kernel will map low memory. This can be useful in optimizing
1021 the virtual memory layout of the system.
1023 Say N here unless you know what you are doing.
1026 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1027 default "0xc0000000"
1029 config KERNEL_START_BOOL
1030 bool "Set custom kernel base address"
1031 depends on ADVANCED_OPTIONS
1033 This option allows you to set the kernel virtual address at which
1034 the kernel will be loaded. Normally this should match PAGE_OFFSET
1035 however there are times (like kdump) that one might not want them
1038 Say N here unless you know what you are doing.
1041 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1042 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1043 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1044 default "0xc0000000"
1046 config PHYSICAL_START_BOOL
1047 bool "Set physical address where the kernel is loaded"
1048 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1050 This gives the physical address where the kernel is loaded.
1052 Say N here unless you know what you are doing.
1054 config PHYSICAL_START
1055 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1056 default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
1057 default "0x00000000"
1059 config PHYSICAL_ALIGN
1061 default "0x04000000" if FSL_BOOKE
1063 This value puts the alignment restrictions on physical address
1064 where kernel is loaded and run from. Kernel is compiled for an
1065 address which meets above alignment restriction.
1067 config TASK_SIZE_BOOL
1068 bool "Set custom user task size"
1069 depends on ADVANCED_OPTIONS
1071 This option allows you to set the amount of virtual address space
1072 allocated to user tasks. This can be useful in optimizing the
1073 virtual memory layout of the system.
1075 Say N here unless you know what you are doing.
1078 hex "Size of user task space" if TASK_SIZE_BOOL
1079 default "0x80000000" if PPC_8xx
1080 default "0xc0000000"
1082 config CONSISTENT_SIZE_BOOL
1083 bool "Set custom consistent memory pool size"
1084 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1086 This option allows you to set the size of the
1087 consistent memory pool. This pool of virtual memory
1088 is used to make consistent memory allocations.
1090 config CONSISTENT_SIZE
1091 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1092 default "0x00200000" if NOT_COHERENT_CACHE
1095 bool "Pinned Kernel TLBs (860 ONLY)"
1096 depends on ADVANCED_OPTIONS && PPC_8xx && \
1097 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1100 bool "Pinned TLB for DATA"
1105 bool "Pinned TLB for IMMR"
1106 depends on PIN_TLB || PPC_EARLY_DEBUG_CPM
1110 bool "Pinned TLB for TEXT"
1116 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1119 default "0xc000000000000000"
1122 default "0xc000000000000000"
1123 config PHYSICAL_START
1125 default "0x00000000"
1131 config PPC_LIB_RHEAP
1134 source "arch/powerpc/kvm/Kconfig"
1136 source "kernel/livepatch/Kconfig"