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_DEVMEM_IS_ALLOWED
132 select ARCH_HAS_DMA_SET_COHERENT_MASK
133 select ARCH_HAS_ELF_RANDOMIZE
134 select ARCH_HAS_FORTIFY_SOURCE
135 select ARCH_HAS_GCOV_PROFILE_ALL
136 select ARCH_HAS_PHYS_TO_DMA
137 select ARCH_HAS_PMEM_API if PPC64
138 select ARCH_HAS_PTE_SPECIAL
139 select ARCH_HAS_MEMBARRIER_CALLBACKS
140 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
141 select ARCH_HAS_SG_CHAIN
142 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !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_WANT_IRQS_OFF_ACTIVATE_MM
156 select ARCH_WEAK_RELEASE_ACQUIRE
158 select BUILDTIME_EXTABLE_SORT
159 select CLONE_BACKWARDS
160 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
161 select DYNAMIC_FTRACE if FUNCTION_TRACER
162 select EDAC_ATOMIC_SCRUB
164 select GENERIC_ATOMIC64 if PPC32
165 select GENERIC_CLOCKEVENTS
166 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
167 select GENERIC_CMOS_UPDATE
168 select GENERIC_CPU_AUTOPROBE
169 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
170 select GENERIC_IRQ_SHOW
171 select GENERIC_IRQ_SHOW_LEVEL
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_CONTEXT_TRACKING if PPC64
185 select HAVE_DEBUG_KMEMLEAK
186 select HAVE_DEBUG_STACKOVERFLOW
187 select HAVE_DYNAMIC_FTRACE
188 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
189 select HAVE_EBPF_JIT if PPC64
190 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
191 select HAVE_FTRACE_MCOUNT_RECORD
192 select HAVE_FUNCTION_GRAPH_TRACER
193 select HAVE_FUNCTION_TRACER
194 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
195 select HAVE_GENERIC_GUP
196 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
198 select HAVE_IOREMAP_PROT
199 select HAVE_IRQ_EXIT_ON_IRQ_STACK
200 select HAVE_KERNEL_GZIP
201 select HAVE_KERNEL_XZ if PPC_BOOK3S
203 select HAVE_KPROBES_ON_FTRACE
204 select HAVE_KRETPROBES
205 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
206 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
208 select HAVE_MEMBLOCK_NODE_MAP
209 select HAVE_MOD_ARCH_SPECIFIC
210 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
211 select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC64 && PPC_BOOK3S && SMP
213 select HAVE_OPTPROBES if PPC64
214 select HAVE_PERF_EVENTS
215 select HAVE_PERF_EVENTS_NMI if PPC64
216 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
217 select HAVE_PERF_REGS
218 select HAVE_PERF_USER_STACK_DUMP
219 select HAVE_RCU_TABLE_FREE if SMP
220 select HAVE_REGS_AND_STACK_ACCESS_API
221 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
222 select HAVE_SYSCALL_TRACEPOINTS
223 select HAVE_VIRT_CPU_ACCOUNTING
224 select HAVE_IRQ_TIME_ACCOUNTING
226 select IOMMU_HELPER if PPC64
228 select IRQ_FORCED_THREADING
229 select MODULES_USE_ELF_RELA
230 select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
231 select NEED_SG_DMA_LENGTH
234 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
235 select OF_EARLY_FLATTREE
236 select OF_RESERVED_MEM
237 select OLD_SIGACTION if PPC32
238 select OLD_SIGSUSPEND
241 select SYSCTL_EXCEPTION_TRACE
242 select VIRT_TO_BUS if !PPC64
244 # Please keep this list sorted alphabetically.
247 config PPC_BARRIER_NOSPEC
250 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
266 select COMPAT_BINFMT_ELF
267 select ARCH_WANT_OLD_COMPAT_IPC
268 select COMPAT_OLD_SIGACTION
270 config SYSVIPC_COMPAT
272 depends on COMPAT && SYSVIPC
275 # All PPC32s use generic nvram driver through ppc_md
280 config SCHED_OMIT_FRAME_POINTER
284 config ARCH_MAY_HAVE_PC_FDC
288 config PPC_UDBG_16550
292 config GENERIC_TBSYNC
294 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.
316 config DEFAULT_UIMAGE
319 Used to allow a board to specify it wants a uImage built by default
322 config ARCH_HIBERNATION_POSSIBLE
326 config ARCH_SUSPEND_POSSIBLE
328 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
329 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
332 config PPC_DCR_NATIVE
342 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
345 config PPC_OF_PLATFORM_PCI
348 depends on PPC64 # not supported on 32 bits yet
351 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
352 depends on PPC32 || PPC_BOOK3S_64
355 config ARCH_SUPPORTS_UPROBES
358 config PPC_ADV_DEBUG_REGS
360 depends on 40x || BOOKE
363 config PPC_ADV_DEBUG_IACS
365 depends on PPC_ADV_DEBUG_REGS
369 config PPC_ADV_DEBUG_DACS
371 depends on PPC_ADV_DEBUG_REGS
374 config PPC_ADV_DEBUG_DVCS
376 depends on PPC_ADV_DEBUG_REGS
380 config PPC_ADV_DEBUG_DAC_RANGE
382 depends on PPC_ADV_DEBUG_REGS && 44x
389 config PGTABLE_LEVELS
392 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
395 source "arch/powerpc/sysdev/Kconfig"
396 source "arch/powerpc/platforms/Kconfig"
398 menu "Kernel options"
401 bool "High memory support"
404 source kernel/Kconfig.hz
406 config HUGETLB_PAGE_SIZE_VARIABLE
408 depends on HUGETLB_PAGE
411 config MATH_EMULATION
412 bool "Math emulation"
413 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
415 Some PowerPC chips designed for embedded applications do not have
416 a floating-point unit and therefore do not implement the
417 floating-point instructions in the PowerPC instruction set. If you
418 say Y here, the kernel will include code to emulate a floating-point
419 unit, which will allow programs that use floating-point
422 This is also useful to emulate missing (optional) instructions
423 such as fsqrt on cores that do have an FPU but do not implement
424 them (such as Freescale BookE).
427 prompt "Math emulation options"
428 default MATH_EMULATION_FULL
429 depends on MATH_EMULATION
431 config MATH_EMULATION_FULL
432 bool "Emulate all the floating point instructions"
434 Select this option will enable the kernel to support to emulate
435 all the floating point instructions. If your SoC doesn't have
436 a FPU, you should select this.
438 config MATH_EMULATION_HW_UNIMPLEMENTED
439 bool "Just emulate the FPU unimplemented instructions"
441 Select this if you know there does have a hardware FPU on your
442 SoC, but some floating point instructions are not implemented by that.
446 config PPC_TRANSACTIONAL_MEM
447 bool "Transactional Memory support for POWERPC"
448 depends on PPC_BOOK3S_64
454 Support user-mode Transactional Memory on POWERPC.
456 config LD_HEAD_STUB_CATCH
457 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
461 Very large kernels can cause linker branch stubs to be generated by
462 code in head_64.S, which moves the head text sections out of their
463 specified location. This option can work around the problem.
467 config MPROFILE_KERNEL
468 depends on PPC64 && CPU_LITTLE_ENDIAN
469 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
472 bool "Support for enabling/disabling CPUs"
473 depends on SMP && (PPC_PSERIES || \
474 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
476 Say Y here to be able to disable and re-enable individual
477 CPUs at runtime on SMP machines.
479 Say N if you are unsure.
481 config ARCH_CPU_PROBE_RELEASE
483 depends on HOTPLUG_CPU
485 config ARCH_ENABLE_MEMORY_HOTPLUG
488 config ARCH_HAS_WALK_MEMORY
491 config ARCH_ENABLE_MEMORY_HOTREMOVE
494 config PPC64_SUPPORTS_MEMORY_FAILURE
495 bool "Add support for memory hwpoison"
496 depends on PPC_BOOK3S_64
497 default "y" if PPC_POWERNV
498 select ARCH_SUPPORTS_MEMORY_FAILURE
501 bool "kexec system call"
502 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
505 kexec is a system call that implements the ability to shutdown your
506 current kernel, and to start another kernel. It is like a reboot
507 but it is independent of the system firmware. And like a reboot
508 you can start any kernel with it, not just Linux.
510 The name comes from the similarity to the exec system call.
512 It is an ongoing process to be certain the hardware in a machine
513 is properly shutdown, so do not be surprised if this code does not
514 initially work for you. As of this writing the exact hardware
515 interface is strongly in flux, so no good recommendation can be
519 bool "kexec file based system call"
521 select HAVE_IMA_KEXEC
525 depends on CRYPTO_SHA256=y
527 This is a new version of the kexec system call. This call is
528 file based and takes in file descriptors as system call arguments
529 for kernel and initramfs as opposed to a list of segments as is the
530 case for the older kexec call.
532 config ARCH_HAS_KEXEC_PURGATORY
536 bool "Build a relocatable kernel"
537 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
538 select NONSTATIC_KERNEL
539 select MODULE_REL_CRCS if MODVERSIONS
541 This builds a kernel image that is capable of running at the
542 location the kernel is loaded at. For ppc32, there is no any
543 alignment restrictions, and this feature is a superset of
544 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
545 16k-aligned base address. The kernel is linked as a
546 position-independent executable (PIE) and contains dynamic relocations
547 which are processed early in the bootup process.
549 One use is for the kexec on panic case where the recovery kernel
550 must live at a different physical address than the primary
553 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
554 it has been loaded at and the compile time physical addresses
555 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
556 setting can still be useful to bootwrappers that need to know the
557 load address of the kernel (eg. u-boot/mkimage).
559 config RELOCATABLE_TEST
560 bool "Test relocatable kernel"
561 depends on (PPC64 && RELOCATABLE)
564 This runs the relocatable kernel at the address it was initially
565 loaded at, which tends to be non-zero and therefore test the
569 bool "Build a dump capture kernel"
570 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
571 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
573 Build a kernel suitable for use as a dump capture kernel.
574 The same kernel binary can be used as production kernel and dump
578 bool "Firmware-assisted dump"
579 depends on PPC64 && PPC_RTAS
583 A robust mechanism to get reliable kernel crash dump with
584 assistance from firmware. This approach does not use kexec,
585 instead firmware assists in booting the capture kernel
586 while preserving memory contents. Firmware-assisted dump
587 is meant to be a kdump replacement offering robustness and
588 speed not possible without system firmware assistance.
593 bool "Distribute interrupts on all CPUs by default"
596 This option gives the kernel permission to distribute IRQs across
597 multiple CPUs. Saying N here will route all IRQs to the first
598 CPU. Generally saying Y is safe, although some problems have been
599 reported with SMP Power Macintoshes with this option enabled.
604 default y if SMP && PPC_PSERIES
610 depends on NEED_MULTIPLE_NODES
612 config USE_PERCPU_NUMA_NODE_ID
616 config HAVE_MEMORYLESS_NODES
620 config ARCH_SELECT_MEMORY_MODEL
624 config ARCH_FLATMEM_ENABLE
626 depends on (PPC64 && !NUMA) || PPC32
628 config ARCH_SPARSEMEM_ENABLE
631 select SPARSEMEM_VMEMMAP_ENABLE
633 config ARCH_SPARSEMEM_DEFAULT
635 depends on PPC_BOOK3S_64
637 config SYS_SUPPORTS_HUGETLBFS
640 config ILLEGAL_POINTER_VALUE
642 # This is roughly half way between the top of user space and the bottom
643 # of kernel space, which seems about as good as we can get.
644 default 0x5deadbeef0000000 if PPC64
647 config ARCH_MEMORY_PROBE
649 depends on MEMORY_HOTPLUG
651 # Some NUMA nodes have memory ranges that span
652 # other nodes. Even though a pfn is valid and
653 # between a node's start and end pfns, it may not
654 # reside on that node. See memmap_init_zone()
656 config NODES_SPAN_OTHER_NODES
658 depends on NEED_MULTIPLE_NODES
661 bool "Using standard binutils settings"
665 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
666 Note, that kernel will be able to run only those applications,
667 which had been compiled using binutils later than 2.17.50.0.3 with
668 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
669 the older binutils, you can patch them with a trivial patch, which
670 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
676 Select the kernel logical page size. Increasing the page size
677 will reduce software overhead at each page boundary, allow
678 hardware prefetch mechanisms to be more effective, and allow
679 larger dma transfers increasing IO efficiency and reducing
680 overhead. However the utilization of memory will increase.
681 For example, each cached file will using a multiple of the
682 page size to hold its contents and the difference between the
683 end of file and the end of page is wasted.
685 Some dedicated systems, such as software raid serving with
686 accelerated calculations, have shown significant increases.
688 If you configure a 64 bit kernel for 64k pages but the
689 processor does not support them, then the kernel will simulate
690 them with 4k pages, loading them on demand, but with the
691 reduced software overhead and larger internal fragmentation.
692 For the 32 bit kernel, a large page option will not be offered
693 unless it is supported by the configured processor.
695 If unsure, choose 4K_PAGES.
699 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
703 depends on 44x || PPC_8xx
707 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
708 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
710 config PPC_256K_PAGES
711 bool "256k page size"
712 depends on 44x && !STDBINUTILS && !PPC_47x
714 Make the page size 256k.
716 As the ELF standard only requires alignment to support page
717 sizes up to 64k, you will need to compile all of your user
718 space applications with a non-standard binutils settings
719 (see the STDBINUTILS description for details).
721 Say N unless you know what you are doing.
726 int "Thread shift" if EXPERT
728 default "15" if PPC_256K_PAGES
729 default "14" if PPC64
732 Used to define the stack size. The default is almost always what you
733 want. Only change this if you know what you are doing.
735 config FORCE_MAX_ZONEORDER
736 int "Maximum zone order"
737 range 8 9 if PPC64 && PPC_64K_PAGES
738 default "9" if PPC64 && PPC_64K_PAGES
739 range 13 13 if PPC64 && !PPC_64K_PAGES
740 default "13" if PPC64 && !PPC_64K_PAGES
741 range 9 64 if PPC32 && PPC_16K_PAGES
742 default "9" if PPC32 && PPC_16K_PAGES
743 range 7 64 if PPC32 && PPC_64K_PAGES
744 default "7" if PPC32 && PPC_64K_PAGES
745 range 5 64 if PPC32 && PPC_256K_PAGES
746 default "5" if PPC32 && PPC_256K_PAGES
750 The kernel memory allocator divides physically contiguous memory
751 blocks into "zones", where each zone is a power of two number of
752 pages. This option selects the largest power of two that the kernel
753 keeps in the memory allocator. If you need to allocate very large
754 blocks of physically contiguous memory, then you may need to
757 This config option is actually maximum order plus one. For example,
758 a value of 11 means that the largest free memory block is 2^10 pages.
760 The page size is not necessarily 4KB. For example, on 64-bit
761 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
762 this in mind when choosing a value for this option.
764 config PPC_SUBPAGE_PROT
765 bool "Support setting protections for 4k subpages"
766 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
768 This option adds support for a system call to allow user programs
769 to set access permissions (read/write, readonly, or no access)
770 on the 4k subpages of each 64k page.
772 config PPC_COPRO_BASE
777 bool "SMT (Hyperthreading) scheduler support"
778 depends on PPC64 && SMP
780 SMT scheduler support improves the CPU scheduler's decision making
781 when dealing with POWER5 cpus at a cost of slightly increased
782 overhead in some places. If unsure say N here.
784 config PPC_DENORMALISATION
785 bool "PowerPC denormalisation exception handling"
786 depends on PPC_BOOK3S_64
787 default "y" if PPC_POWERNV
789 Add support for handling denormalisation of single precision
790 values. Useful for bare metal only. If unsure say Y here.
793 bool "Default bootloader kernel arguments"
796 string "Initial kernel command string"
797 depends on CMDLINE_BOOL
798 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
800 On some platforms, there is currently no way for the boot loader to
801 pass arguments to the kernel. For these platforms, you can supply
802 some command-line options at build time by entering them here. In
803 most cases you will need to specify the root device here.
806 bool "Always use the default kernel command string"
807 depends on CMDLINE_BOOL
809 Always use the default kernel command string, even if the boot
810 loader passes other arguments to the kernel.
811 This is useful if you cannot or don't want to change the
812 command-line options your boot loader passes to the kernel.
815 string "Additional default image types"
817 List additional targets to be built by the bootwrapper here (separated
818 by spaces). This is useful for targets that depend of device tree
819 files in the .dts directory.
821 Targets in this list will be build as part of the default build
822 target, or when the user does a 'make zImage' or a
823 'make zImage.initrd'.
825 If unsure, leave blank
827 config ARCH_WANTS_FREEZER_CONTROL
831 source kernel/power/Kconfig
834 bool "Enable seccomp to safely compute untrusted bytecode"
838 This kernel feature is useful for number crunching applications
839 that may need to compute untrusted bytecode during their
840 execution. By using pipes or other transports made available to
841 the process as file descriptors supporting the read/write
842 syscalls, it's possible to isolate those applications in
843 their own address space using seccomp. Once seccomp is
844 enabled via /proc/<pid>/seccomp, it cannot be disabled
845 and the task is only allowed to execute a few safe syscalls
846 defined by each seccomp mode.
848 If unsure, say Y. Only embedded should say N here.
851 prompt "PowerPC Memory Protection Keys"
853 depends on PPC_BOOK3S_64
854 select ARCH_USES_HIGH_VMA_FLAGS
855 select ARCH_HAS_PKEYS
857 Memory Protection Keys provides a mechanism for enforcing
858 page-based protections, but without requiring modification of the
859 page tables when an application changes protection domains.
861 For details, see Documentation/vm/protection-keys.rst
874 bool "Support for ISA-bus hardware"
878 Find out whether you have ISA slots on your motherboard. ISA is the
879 name of a bus system, i.e. the way the CPU talks to the other stuff
880 inside your box. If you have an Apple machine, say N here; if you
881 have an IBM RS/6000 or pSeries machine, say Y. If you have an
882 embedded board, consult your board documentation.
888 config GENERIC_ISA_DMA
890 depends on ISA_DMA_API
893 config PPC_INDIRECT_PCI
896 default y if 40x || 44x
910 select PPC_INDIRECT_PCI
916 depends on SUSPEND && (PPC_85xx || PPC_86xx)
918 Freescale MPC85xx/MPC86xx power management controller support
919 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
924 depends on SUSPEND && (44x || 40x)
926 PPC4xx Clock Power Management (CPM) support (suspend/resume).
927 It also enables support for two different idle states (idle-wait
934 bool "Freescale Local Bus support"
936 Enables reporting of errors from the Freescale local bus
937 controller. Also contains some common code used by
938 drivers for specific local bus peripherals.
942 depends on PPC_83xx || QUICC_ENGINE || CPM2
944 Freescale General-purpose Timers support
946 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
950 # Platforms that what PCI turned unconditionally just do select PCI
951 # in their config node. Platforms that want to choose at config
952 # time should select PPC_PCI_CHOICE
953 config PPC_PCI_CHOICE
957 bool "PCI support" if PPC_PCI_CHOICE
958 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
959 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
960 default PCI_QSPAN if PPC_8xx
961 select GENERIC_PCI_IOMAP
963 Find out whether your system includes a PCI bus. PCI is the name of
964 a bus system, i.e. the way the CPU talks to the other stuff inside
965 your box. If you say Y here, the kernel will include drivers and
966 infrastructure code to support PCI bus devices.
979 Say Y here if you have a system based on a Motorola 8xx-series
980 embedded processor with a QSPAN PCI interface, otherwise say N.
984 depends on PCI && 8260
985 select PPC_INDIRECT_PCI
988 source "drivers/pci/Kconfig"
990 source "drivers/pcmcia/Kconfig"
997 tristate "RapidIO support"
998 depends on HAS_RAPIDIO || PCI
1000 If you say Y here, the kernel will include drivers and
1001 infrastructure code to support RapidIO interconnect devices.
1004 bool "Freescale Embedded SRIO Controller support"
1005 depends on RAPIDIO = y && HAS_RAPIDIO
1008 Include support for RapidIO controller on Freescale embedded
1009 processors (MPC8548, MPC8641, etc).
1011 source "drivers/rapidio/Kconfig"
1013 config PPC_RTAS_FILTER
1014 bool "Enable filtering of RTAS syscalls"
1018 The RTAS syscall API has security issues that could be used to
1019 compromise system integrity. This option enforces restrictions on the
1020 RTAS calls and arguments passed by userspace programs to mitigate
1023 Say Y unless you know what you are doing and the filter is causing
1028 config NONSTATIC_KERNEL
1032 menu "Advanced setup"
1035 config ADVANCED_OPTIONS
1036 bool "Prompt for advanced kernel configuration options"
1038 This option will enable prompting for a variety of advanced kernel
1039 configuration options. These options can cause the kernel to not
1040 work if they are set incorrectly, but can be used to optimize certain
1041 aspects of kernel memory management.
1043 Unless you know what you are doing, say N here.
1045 comment "Default settings for advanced configuration options are used"
1046 depends on !ADVANCED_OPTIONS
1048 config LOWMEM_SIZE_BOOL
1049 bool "Set maximum low memory"
1050 depends on ADVANCED_OPTIONS
1052 This option allows you to set the maximum amount of memory which
1053 will be used as "low memory", that is, memory which the kernel can
1054 access directly, without having to set up a kernel virtual mapping.
1055 This can be useful in optimizing the layout of kernel virtual
1058 Say N here unless you know what you are doing.
1061 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1062 default "0x30000000"
1064 config LOWMEM_CAM_NUM_BOOL
1065 bool "Set number of CAMs to use to map low memory"
1066 depends on ADVANCED_OPTIONS && FSL_BOOKE
1068 This option allows you to set the maximum number of CAM slots that
1069 will be used to map low memory. There are a limited number of slots
1070 available and even more limited number that will fit in the L1 MMU.
1071 However, using more entries will allow mapping more low memory. This
1072 can be useful in optimizing the layout of kernel virtual memory.
1074 Say N here unless you know what you are doing.
1076 config LOWMEM_CAM_NUM
1077 depends on FSL_BOOKE
1078 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1081 config DYNAMIC_MEMSTART
1082 bool "Enable page aligned dynamic load address for kernel"
1083 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1084 select NONSTATIC_KERNEL
1086 This option enables the kernel to be loaded at any page aligned
1087 physical address. The kernel creates a mapping from KERNELBASE to
1088 the address where the kernel is loaded. The page size here implies
1089 the TLB page size of the mapping for kernel on the particular platform.
1090 Please refer to the init code for finding the TLB page size.
1092 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1093 kernel image, where the only restriction is the page aligned kernel
1094 load address. When this option is enabled, the compile time physical
1095 address CONFIG_PHYSICAL_START is ignored.
1097 This option is overridden by CONFIG_RELOCATABLE
1099 config PAGE_OFFSET_BOOL
1100 bool "Set custom page offset address"
1101 depends on ADVANCED_OPTIONS
1103 This option allows you to set the kernel virtual address at which
1104 the kernel will map low memory. This can be useful in optimizing
1105 the virtual memory layout of the system.
1107 Say N here unless you know what you are doing.
1110 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1111 default "0xc0000000"
1113 config KERNEL_START_BOOL
1114 bool "Set custom kernel base address"
1115 depends on ADVANCED_OPTIONS
1117 This option allows you to set the kernel virtual address at which
1118 the kernel will be loaded. Normally this should match PAGE_OFFSET
1119 however there are times (like kdump) that one might not want them
1122 Say N here unless you know what you are doing.
1125 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1126 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1127 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1128 default "0xc0000000"
1130 config PHYSICAL_START_BOOL
1131 bool "Set physical address where the kernel is loaded"
1132 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1134 This gives the physical address where the kernel is loaded.
1136 Say N here unless you know what you are doing.
1138 config PHYSICAL_START
1139 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1140 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1141 default "0x00000000"
1143 config PHYSICAL_ALIGN
1145 default "0x04000000" if FSL_BOOKE
1147 This value puts the alignment restrictions on physical address
1148 where kernel is loaded and run from. Kernel is compiled for an
1149 address which meets above alignment restriction.
1151 config TASK_SIZE_BOOL
1152 bool "Set custom user task size"
1153 depends on ADVANCED_OPTIONS
1155 This option allows you to set the amount of virtual address space
1156 allocated to user tasks. This can be useful in optimizing the
1157 virtual memory layout of the system.
1159 Say N here unless you know what you are doing.
1162 hex "Size of user task space" if TASK_SIZE_BOOL
1163 default "0x80000000" if PPC_8xx
1164 default "0xc0000000"
1166 config CONSISTENT_SIZE_BOOL
1167 bool "Set custom consistent memory pool size"
1168 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1170 This option allows you to set the size of the
1171 consistent memory pool. This pool of virtual memory
1172 is used to make consistent memory allocations.
1174 config CONSISTENT_SIZE
1175 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1176 default "0x00200000" if NOT_COHERENT_CACHE
1179 bool "Pinned Kernel TLBs (860 ONLY)"
1180 depends on ADVANCED_OPTIONS && PPC_8xx && \
1181 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1184 bool "Pinned TLB for DATA"
1189 bool "Pinned TLB for IMMR"
1194 bool "Pinned TLB for TEXT"
1200 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1203 default "0xc000000000000000"
1206 default "0xc000000000000000"
1207 config PHYSICAL_START
1209 default "0x00000000"
1215 config PPC_LIB_RHEAP
1218 source "arch/powerpc/kvm/Kconfig"
1220 source "kernel/livepatch/Kconfig"