1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
16 config ARCH_PHYS_ADDR_T_64BIT
17 def_bool PPC64 || PHYS_64BIT
19 config ARCH_DMA_ADDR_T_64BIT
20 def_bool ARCH_PHYS_ADDR_T_64BIT
26 config ARCH_MMAP_RND_BITS_MAX
27 # On Book3S 64, the default virtual address space for 64-bit processes
28 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
29 # 32T of address space (2^45), which should ensure a reasonable gap
30 # between bottom-up and top-down allocations for applications that
31 # consume "normal" amounts of address space. Book3S 64 only supports 64K
33 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
34 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
36 # On all other 64-bit platforms (currently only Book3E), the virtual
37 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
38 # of address space (2^44). Only 4K page sizes are supported.
39 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
41 # For 32-bit, use the compat values, as they're the same.
42 default ARCH_MMAP_RND_COMPAT_BITS_MAX
44 config ARCH_MMAP_RND_BITS_MIN
45 # Allow randomisation to consume up to 1GB of address space (2^30).
46 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
47 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
49 # For 32-bit, use the compat values, as they're the same.
50 default ARCH_MMAP_RND_COMPAT_BITS_MIN
52 config ARCH_MMAP_RND_COMPAT_BITS_MAX
53 # Total virtual address space for 32-bit processes is 2^31 (2GB).
54 # Allow randomisation to consume up to 512MB of address space (2^29).
55 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
56 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
57 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
58 default 17 # 17 = 29 (512MB) - 12 (4K)
60 config ARCH_MMAP_RND_COMPAT_BITS_MIN
61 # Total virtual address space for 32-bit processes is 2^31 (2GB).
62 # Allow randomisation to consume up to 8MB of address space (2^23).
63 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
64 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
65 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
66 default 11 # 11 = 23 (8MB) - 12 (4K)
68 config HAVE_SETUP_PER_CPU_AREA
71 config NEED_PER_CPU_EMBED_FIRST_CHUNK
75 int "Number of virtual interrupt numbers"
79 This defines the number of virtual interrupt numbers the kernel
80 can manage. Virtual interrupt numbers are what you see in
81 /proc/interrupts. If you configure your system to have too few,
82 drivers will fail to load or worse - handle with care.
86 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
91 depends on HARDLOCKUP_DETECTOR
92 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
95 This is a placeholder when the powerpc hardlockup detector
96 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
97 seleted via the generic lockup detector menu which is why we
98 have no standalone config option for it here.
100 config STACKTRACE_SUPPORT
104 config TRACE_IRQFLAGS_SUPPORT
108 config LOCKDEP_SUPPORT
112 config RWSEM_GENERIC_SPINLOCK
115 config RWSEM_XCHGADD_ALGORITHM
119 config GENERIC_LOCKBREAK
122 depends on SMP && PREEMPT
124 config GENERIC_HWEIGHT
128 config ARCH_HAS_DMA_SET_COHERENT_MASK
135 # Please keep this list sorted alphabetically.
137 select ARCH_HAS_DEVMEM_IS_ALLOWED
138 select ARCH_HAS_DMA_SET_COHERENT_MASK
139 select ARCH_HAS_ELF_RANDOMIZE
140 select ARCH_HAS_FORTIFY_SOURCE
141 select ARCH_HAS_GCOV_PROFILE_ALL
142 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
143 select ARCH_HAS_SG_CHAIN
144 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
145 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
146 select ARCH_HAS_UBSAN_SANITIZE_ALL
147 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
148 select ARCH_HAVE_NMI_SAFE_CMPXCHG
149 select ARCH_MIGHT_HAVE_PC_PARPORT
150 select ARCH_MIGHT_HAVE_PC_SERIO
151 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
152 select ARCH_SUPPORTS_ATOMIC_RMW
153 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
154 select ARCH_USE_BUILTIN_BSWAP
155 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
156 select ARCH_WANT_IPC_PARSE_VERSION
157 select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
158 select ARCH_WEAK_RELEASE_ACQUIRE
160 select BUILDTIME_EXTABLE_SORT
161 select CLONE_BACKWARDS
162 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
163 select EDAC_ATOMIC_SCRUB
165 select GENERIC_ATOMIC64 if PPC32
166 select GENERIC_CLOCKEVENTS
167 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
168 select GENERIC_CMOS_UPDATE
169 select GENERIC_CPU_AUTOPROBE
170 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
171 select GENERIC_IRQ_SHOW
172 select GENERIC_IRQ_SHOW_LEVEL
173 select GENERIC_SMP_IDLE_THREAD
174 select GENERIC_STRNCPY_FROM_USER
175 select GENERIC_STRNLEN_USER
176 select GENERIC_TIME_VSYSCALL
177 select HAVE_ARCH_AUDITSYSCALL
178 select HAVE_ARCH_JUMP_LABEL
179 select HAVE_ARCH_KGDB
180 select HAVE_ARCH_MMAP_RND_BITS
181 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
182 select HAVE_ARCH_SECCOMP_FILTER
183 select HAVE_ARCH_TRACEHOOK
184 select HAVE_CBPF_JIT if !PPC64
185 select HAVE_CONTEXT_TRACKING if PPC64
186 select HAVE_DEBUG_KMEMLEAK
187 select HAVE_DEBUG_STACKOVERFLOW
188 select HAVE_DMA_API_DEBUG
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_GRAPH_TRACER
195 select HAVE_FUNCTION_TRACER
196 select HAVE_GCC_PLUGINS
197 select HAVE_GENERIC_GUP
198 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
200 select HAVE_IOREMAP_PROT
201 select HAVE_IRQ_EXIT_ON_IRQ_STACK
202 select HAVE_KERNEL_GZIP
204 select HAVE_KPROBES_ON_FTRACE
205 select HAVE_KRETPROBES
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_SYSCALL_TRACEPOINTS
222 select HAVE_VIRT_CPU_ACCOUNTING
223 select HAVE_IRQ_TIME_ACCOUNTING
225 select IRQ_FORCED_THREADING
226 select MODULES_USE_ELF_RELA
229 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
230 select OF_EARLY_FLATTREE
231 select OF_RESERVED_MEM
232 select OLD_SIGACTION if PPC32
233 select OLD_SIGSUSPEND
235 select SYSCTL_EXCEPTION_TRACE
236 select VIRT_TO_BUS if !PPC64
238 # Please keep this list sorted alphabetically.
241 config PPC_BARRIER_NOSPEC
244 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
260 select COMPAT_BINFMT_ELF
261 select ARCH_WANT_OLD_COMPAT_IPC
262 select COMPAT_OLD_SIGACTION
264 config SYSVIPC_COMPAT
266 depends on COMPAT && SYSVIPC
269 # All PPC32s use generic nvram driver through ppc_md
274 config SCHED_OMIT_FRAME_POINTER
278 config ARCH_MAY_HAVE_PC_FDC
282 config PPC_UDBG_16550
286 config GENERIC_TBSYNC
288 default y if PPC32 && SMP
300 config SYS_SUPPORTS_APM_EMULATION
301 default y if PMAC_APM_EMU
307 Used to allow a board to specify it wants an ePAPR compliant wrapper.
310 config DEFAULT_UIMAGE
313 Used to allow a board to specify it wants a uImage built by default
316 config ARCH_HIBERNATION_POSSIBLE
320 config ARCH_SUSPEND_POSSIBLE
322 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
323 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
326 config PPC_DCR_NATIVE
336 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
339 config PPC_OF_PLATFORM_PCI
342 depends on PPC64 # not supported on 32 bits yet
345 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
346 depends on PPC32 || PPC_STD_MMU_64
349 config ARCH_SUPPORTS_UPROBES
352 config PPC_ADV_DEBUG_REGS
354 depends on 40x || BOOKE
357 config PPC_ADV_DEBUG_IACS
359 depends on PPC_ADV_DEBUG_REGS
363 config PPC_ADV_DEBUG_DACS
365 depends on PPC_ADV_DEBUG_REGS
368 config PPC_ADV_DEBUG_DVCS
370 depends on PPC_ADV_DEBUG_REGS
374 config PPC_ADV_DEBUG_DAC_RANGE
376 depends on PPC_ADV_DEBUG_REGS && 44x
383 config PGTABLE_LEVELS
386 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
389 source "init/Kconfig"
391 source "kernel/Kconfig.freezer"
393 source "arch/powerpc/sysdev/Kconfig"
394 source "arch/powerpc/platforms/Kconfig"
396 menu "Kernel options"
399 bool "High memory support"
402 source kernel/Kconfig.hz
403 source kernel/Kconfig.preempt
404 source "fs/Kconfig.binfmt"
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 DISABLE_MPROFILE_KERNEL
468 bool "Disable use of mprofile-kernel for kernel tracing"
469 depends on PPC64 && CPU_LITTLE_ENDIAN
472 Selecting this options disables use of the mprofile-kernel ABI for
473 kernel tracing. That will cause options such as live patching
474 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
477 If you have a toolchain which supports mprofile-kernel, then you can
478 disable this. Otherwise leave it enabled. If you're not sure, say
481 config MPROFILE_KERNEL
482 depends on PPC64 && CPU_LITTLE_ENDIAN
483 def_bool !DISABLE_MPROFILE_KERNEL
489 bool "SWIOTLB support"
493 Support for IO bounce buffering for systems without an IOMMU.
494 This allows us to DMA to the full physical address space on
495 platforms where the size of a physical address is larger
496 than the bus address. Not all platforms support this.
499 bool "Support for enabling/disabling CPUs"
500 depends on SMP && (PPC_PSERIES || \
501 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
503 Say Y here to be able to disable and re-enable individual
504 CPUs at runtime on SMP machines.
506 Say N if you are unsure.
508 config ARCH_CPU_PROBE_RELEASE
510 depends on HOTPLUG_CPU
512 config ARCH_ENABLE_MEMORY_HOTPLUG
515 config ARCH_HAS_WALK_MEMORY
518 config ARCH_ENABLE_MEMORY_HOTREMOVE
521 config PPC64_SUPPORTS_MEMORY_FAILURE
522 bool "Add support for memory hwpoison"
523 depends on PPC_BOOK3S_64
524 default "y" if PPC_POWERNV
525 select ARCH_SUPPORTS_MEMORY_FAILURE
528 bool "kexec system call"
529 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
532 kexec is a system call that implements the ability to shutdown your
533 current kernel, and to start another kernel. It is like a reboot
534 but it is independent of the system firmware. And like a reboot
535 you can start any kernel with it, not just Linux.
537 The name comes from the similarity to the exec system call.
539 It is an ongoing process to be certain the hardware in a machine
540 is properly shutdown, so do not be surprised if this code does not
541 initially work for you. As of this writing the exact hardware
542 interface is strongly in flux, so no good recommendation can be
546 bool "kexec file based system call"
548 select HAVE_IMA_KEXEC
552 depends on CRYPTO_SHA256=y
554 This is a new version of the kexec system call. This call is
555 file based and takes in file descriptors as system call arguments
556 for kernel and initramfs as opposed to a list of segments as is the
557 case for the older kexec call.
560 bool "Build a relocatable kernel"
561 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
562 select NONSTATIC_KERNEL
563 select MODULE_REL_CRCS if MODVERSIONS
565 This builds a kernel image that is capable of running at the
566 location the kernel is loaded at. For ppc32, there is no any
567 alignment restrictions, and this feature is a superset of
568 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
569 16k-aligned base address. The kernel is linked as a
570 position-independent executable (PIE) and contains dynamic relocations
571 which are processed early in the bootup process.
573 One use is for the kexec on panic case where the recovery kernel
574 must live at a different physical address than the primary
577 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
578 it has been loaded at and the compile time physical addresses
579 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
580 setting can still be useful to bootwrappers that need to know the
581 load address of the kernel (eg. u-boot/mkimage).
583 config RELOCATABLE_TEST
584 bool "Test relocatable kernel"
585 depends on (PPC64 && RELOCATABLE)
588 This runs the relocatable kernel at the address it was initially
589 loaded at, which tends to be non-zero and therefore test the
593 bool "Build a dump capture kernel"
594 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
595 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
597 Build a kernel suitable for use as a dump capture kernel.
598 The same kernel binary can be used as production kernel and dump
602 bool "Firmware-assisted dump"
603 depends on PPC64 && PPC_RTAS
607 A robust mechanism to get reliable kernel crash dump with
608 assistance from firmware. This approach does not use kexec,
609 instead firmware assists in booting the capture kernel
610 while preserving memory contents. Firmware-assisted dump
611 is meant to be a kdump replacement offering robustness and
612 speed not possible without system firmware assistance.
617 bool "Distribute interrupts on all CPUs by default"
620 This option gives the kernel permission to distribute IRQs across
621 multiple CPUs. Saying N here will route all IRQs to the first
622 CPU. Generally saying Y is safe, although some problems have been
623 reported with SMP Power Macintoshes with this option enabled.
628 default y if SMP && PPC_PSERIES
634 depends on NEED_MULTIPLE_NODES
636 config USE_PERCPU_NUMA_NODE_ID
640 config HAVE_MEMORYLESS_NODES
644 config ARCH_SELECT_MEMORY_MODEL
648 config ARCH_FLATMEM_ENABLE
650 depends on (PPC64 && !NUMA) || PPC32
652 config ARCH_SPARSEMEM_ENABLE
655 select SPARSEMEM_VMEMMAP_ENABLE
657 config ARCH_SPARSEMEM_DEFAULT
659 depends on PPC_BOOK3S_64
661 config SYS_SUPPORTS_HUGETLBFS
664 config ILLEGAL_POINTER_VALUE
666 # This is roughly half way between the top of user space and the bottom
667 # of kernel space, which seems about as good as we can get.
668 default 0x5deadbeef0000000 if PPC64
673 config ARCH_MEMORY_PROBE
675 depends on MEMORY_HOTPLUG
677 # Some NUMA nodes have memory ranges that span
678 # other nodes. Even though a pfn is valid and
679 # between a node's start and end pfns, it may not
680 # reside on that node. See memmap_init_zone()
682 config NODES_SPAN_OTHER_NODES
684 depends on NEED_MULTIPLE_NODES
687 bool "Using standard binutils settings"
691 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
692 Note, that kernel will be able to run only those applications,
693 which had been compiled using binutils later than 2.17.50.0.3 with
694 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
695 the older binutils, you can patch them with a trivial patch, which
696 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
702 Select the kernel logical page size. Increasing the page size
703 will reduce software overhead at each page boundary, allow
704 hardware prefetch mechanisms to be more effective, and allow
705 larger dma transfers increasing IO efficiency and reducing
706 overhead. However the utilization of memory will increase.
707 For example, each cached file will using a multiple of the
708 page size to hold its contents and the difference between the
709 end of file and the end of page is wasted.
711 Some dedicated systems, such as software raid serving with
712 accelerated calculations, have shown significant increases.
714 If you configure a 64 bit kernel for 64k pages but the
715 processor does not support them, then the kernel will simulate
716 them with 4k pages, loading them on demand, but with the
717 reduced software overhead and larger internal fragmentation.
718 For the 32 bit kernel, a large page option will not be offered
719 unless it is supported by the configured processor.
721 If unsure, choose 4K_PAGES.
725 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
729 depends on 44x || PPC_8xx
733 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
734 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
736 config PPC_256K_PAGES
737 bool "256k page size"
738 depends on 44x && !STDBINUTILS && !PPC_47x
740 Make the page size 256k.
742 As the ELF standard only requires alignment to support page
743 sizes up to 64k, you will need to compile all of your user
744 space applications with a non-standard binutils settings
745 (see the STDBINUTILS description for details).
747 Say N unless you know what you are doing.
752 int "Thread shift" if EXPERT
754 default "15" if PPC_256K_PAGES
755 default "14" if PPC64
758 Used to define the stack size. The default is almost always what you
759 want. Only change this if you know what you are doing.
761 config FORCE_MAX_ZONEORDER
762 int "Maximum zone order"
763 range 8 9 if PPC64 && PPC_64K_PAGES
764 default "9" if PPC64 && PPC_64K_PAGES
765 range 13 13 if PPC64 && !PPC_64K_PAGES
766 default "13" if PPC64 && !PPC_64K_PAGES
767 range 9 64 if PPC32 && PPC_16K_PAGES
768 default "9" if PPC32 && PPC_16K_PAGES
769 range 7 64 if PPC32 && PPC_64K_PAGES
770 default "7" if PPC32 && PPC_64K_PAGES
771 range 5 64 if PPC32 && PPC_256K_PAGES
772 default "5" if PPC32 && PPC_256K_PAGES
776 The kernel memory allocator divides physically contiguous memory
777 blocks into "zones", where each zone is a power of two number of
778 pages. This option selects the largest power of two that the kernel
779 keeps in the memory allocator. If you need to allocate very large
780 blocks of physically contiguous memory, then you may need to
783 This config option is actually maximum order plus one. For example,
784 a value of 11 means that the largest free memory block is 2^10 pages.
786 The page size is not necessarily 4KB. For example, on 64-bit
787 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
788 this in mind when choosing a value for this option.
790 config PPC_SUBPAGE_PROT
791 bool "Support setting protections for 4k subpages"
792 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
794 This option adds support for a system call to allow user programs
795 to set access permissions (read/write, readonly, or no access)
796 on the 4k subpages of each 64k page.
798 config PPC_COPRO_BASE
803 bool "SMT (Hyperthreading) scheduler support"
804 depends on PPC64 && SMP
806 SMT scheduler support improves the CPU scheduler's decision making
807 when dealing with POWER5 cpus at a cost of slightly increased
808 overhead in some places. If unsure say N here.
810 config PPC_DENORMALISATION
811 bool "PowerPC denormalisation exception handling"
812 depends on PPC_BOOK3S_64
813 default "y" if PPC_POWERNV
815 Add support for handling denormalisation of single precision
816 values. Useful for bare metal only. If unsure say Y here.
819 bool "Default bootloader kernel arguments"
822 string "Initial kernel command string"
823 depends on CMDLINE_BOOL
824 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
826 On some platforms, there is currently no way for the boot loader to
827 pass arguments to the kernel. For these platforms, you can supply
828 some command-line options at build time by entering them here. In
829 most cases you will need to specify the root device here.
832 bool "Always use the default kernel command string"
833 depends on CMDLINE_BOOL
835 Always use the default kernel command string, even if the boot
836 loader passes other arguments to the kernel.
837 This is useful if you cannot or don't want to change the
838 command-line options your boot loader passes to the kernel.
841 string "Additional default image types"
843 List additional targets to be built by the bootwrapper here (separated
844 by spaces). This is useful for targets that depend of device tree
845 files in the .dts directory.
847 Targets in this list will be build as part of the default build
848 target, or when the user does a 'make zImage' or a
849 'make zImage.initrd'.
851 If unsure, leave blank
853 config ARCH_WANTS_FREEZER_CONTROL
857 source kernel/power/Kconfig
860 bool "Enable seccomp to safely compute untrusted bytecode"
864 This kernel feature is useful for number crunching applications
865 that may need to compute untrusted bytecode during their
866 execution. By using pipes or other transports made available to
867 the process as file descriptors supporting the read/write
868 syscalls, it's possible to isolate those applications in
869 their own address space using seccomp. Once seccomp is
870 enabled via /proc/<pid>/seccomp, it cannot be disabled
871 and the task is only allowed to execute a few safe syscalls
872 defined by each seccomp mode.
874 If unsure, say Y. Only embedded should say N here.
885 bool "Support for ISA-bus hardware"
889 Find out whether you have ISA slots on your motherboard. ISA is the
890 name of a bus system, i.e. the way the CPU talks to the other stuff
891 inside your box. If you have an Apple machine, say N here; if you
892 have an IBM RS/6000 or pSeries machine, say Y. If you have an
893 embedded board, consult your board documentation.
899 config NEED_DMA_MAP_STATE
900 def_bool (PPC64 || NOT_COHERENT_CACHE)
902 config NEED_SG_DMA_LENGTH
905 config GENERIC_ISA_DMA
907 depends on ISA_DMA_API
910 config PPC_INDIRECT_PCI
913 default y if 40x || 44x
927 select PPC_INDIRECT_PCI
933 depends on SUSPEND && (PPC_85xx || PPC_86xx)
935 Freescale MPC85xx/MPC86xx power management controller support
936 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
941 depends on SUSPEND && (44x || 40x)
943 PPC4xx Clock Power Management (CPM) support (suspend/resume).
944 It also enables support for two different idle states (idle-wait
951 bool "Freescale Local Bus support"
953 Enables reporting of errors from the Freescale local bus
954 controller. Also contains some common code used by
955 drivers for specific local bus peripherals.
959 depends on PPC_83xx || QUICC_ENGINE || CPM2
961 Freescale General-purpose Timers support
963 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
967 # Platforms that what PCI turned unconditionally just do select PCI
968 # in their config node. Platforms that want to choose at config
969 # time should select PPC_PCI_CHOICE
970 config PPC_PCI_CHOICE
974 bool "PCI support" if PPC_PCI_CHOICE
975 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
976 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
977 default PCI_QSPAN if PPC_8xx
978 select GENERIC_PCI_IOMAP
980 Find out whether your system includes a PCI bus. PCI is the name of
981 a bus system, i.e. the way the CPU talks to the other stuff inside
982 your box. If you say Y here, the kernel will include drivers and
983 infrastructure code to support PCI bus devices.
996 Say Y here if you have a system based on a Motorola 8xx-series
997 embedded processor with a QSPAN PCI interface, otherwise say N.
1001 depends on PCI && 8260
1002 select PPC_INDIRECT_PCI
1005 source "drivers/pci/Kconfig"
1007 source "drivers/pcmcia/Kconfig"
1014 tristate "RapidIO support"
1015 depends on HAS_RAPIDIO || PCI
1017 If you say Y here, the kernel will include drivers and
1018 infrastructure code to support RapidIO interconnect devices.
1021 bool "Freescale Embedded SRIO Controller support"
1022 depends on RAPIDIO = y && HAS_RAPIDIO
1025 Include support for RapidIO controller on Freescale embedded
1026 processors (MPC8548, MPC8641, etc).
1028 source "drivers/rapidio/Kconfig"
1030 config PPC_RTAS_FILTER
1031 bool "Enable filtering of RTAS syscalls"
1035 The RTAS syscall API has security issues that could be used to
1036 compromise system integrity. This option enforces restrictions on the
1037 RTAS calls and arguments passed by userspace programs to mitigate
1040 Say Y unless you know what you are doing and the filter is causing
1045 config NONSTATIC_KERNEL
1049 menu "Advanced setup"
1052 config ADVANCED_OPTIONS
1053 bool "Prompt for advanced kernel configuration options"
1055 This option will enable prompting for a variety of advanced kernel
1056 configuration options. These options can cause the kernel to not
1057 work if they are set incorrectly, but can be used to optimize certain
1058 aspects of kernel memory management.
1060 Unless you know what you are doing, say N here.
1062 comment "Default settings for advanced configuration options are used"
1063 depends on !ADVANCED_OPTIONS
1065 config LOWMEM_SIZE_BOOL
1066 bool "Set maximum low memory"
1067 depends on ADVANCED_OPTIONS
1069 This option allows you to set the maximum amount of memory which
1070 will be used as "low memory", that is, memory which the kernel can
1071 access directly, without having to set up a kernel virtual mapping.
1072 This can be useful in optimizing the layout of kernel virtual
1075 Say N here unless you know what you are doing.
1078 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1079 default "0x30000000"
1081 config LOWMEM_CAM_NUM_BOOL
1082 bool "Set number of CAMs to use to map low memory"
1083 depends on ADVANCED_OPTIONS && FSL_BOOKE
1085 This option allows you to set the maximum number of CAM slots that
1086 will be used to map low memory. There are a limited number of slots
1087 available and even more limited number that will fit in the L1 MMU.
1088 However, using more entries will allow mapping more low memory. This
1089 can be useful in optimizing the layout of kernel virtual memory.
1091 Say N here unless you know what you are doing.
1093 config LOWMEM_CAM_NUM
1094 depends on FSL_BOOKE
1095 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1098 config DYNAMIC_MEMSTART
1099 bool "Enable page aligned dynamic load address for kernel"
1100 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1101 select NONSTATIC_KERNEL
1103 This option enables the kernel to be loaded at any page aligned
1104 physical address. The kernel creates a mapping from KERNELBASE to
1105 the address where the kernel is loaded. The page size here implies
1106 the TLB page size of the mapping for kernel on the particular platform.
1107 Please refer to the init code for finding the TLB page size.
1109 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1110 kernel image, where the only restriction is the page aligned kernel
1111 load address. When this option is enabled, the compile time physical
1112 address CONFIG_PHYSICAL_START is ignored.
1114 This option is overridden by CONFIG_RELOCATABLE
1116 config PAGE_OFFSET_BOOL
1117 bool "Set custom page offset address"
1118 depends on ADVANCED_OPTIONS
1120 This option allows you to set the kernel virtual address at which
1121 the kernel will map low memory. This can be useful in optimizing
1122 the virtual memory layout of the system.
1124 Say N here unless you know what you are doing.
1127 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1128 default "0xc0000000"
1130 config KERNEL_START_BOOL
1131 bool "Set custom kernel base address"
1132 depends on ADVANCED_OPTIONS
1134 This option allows you to set the kernel virtual address at which
1135 the kernel will be loaded. Normally this should match PAGE_OFFSET
1136 however there are times (like kdump) that one might not want them
1139 Say N here unless you know what you are doing.
1142 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1143 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1144 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1145 default "0xc0000000"
1147 config PHYSICAL_START_BOOL
1148 bool "Set physical address where the kernel is loaded"
1149 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1151 This gives the physical address where the kernel is loaded.
1153 Say N here unless you know what you are doing.
1155 config PHYSICAL_START
1156 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1157 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1158 default "0x00000000"
1160 config PHYSICAL_ALIGN
1162 default "0x04000000" if FSL_BOOKE
1164 This value puts the alignment restrictions on physical address
1165 where kernel is loaded and run from. Kernel is compiled for an
1166 address which meets above alignment restriction.
1168 config TASK_SIZE_BOOL
1169 bool "Set custom user task size"
1170 depends on ADVANCED_OPTIONS
1172 This option allows you to set the amount of virtual address space
1173 allocated to user tasks. This can be useful in optimizing the
1174 virtual memory layout of the system.
1176 Say N here unless you know what you are doing.
1179 hex "Size of user task space" if TASK_SIZE_BOOL
1180 default "0x80000000" if PPC_8xx
1181 default "0xc0000000"
1183 config CONSISTENT_SIZE_BOOL
1184 bool "Set custom consistent memory pool size"
1185 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1187 This option allows you to set the size of the
1188 consistent memory pool. This pool of virtual memory
1189 is used to make consistent memory allocations.
1191 config CONSISTENT_SIZE
1192 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1193 default "0x00200000" if NOT_COHERENT_CACHE
1196 bool "Pinned Kernel TLBs (860 ONLY)"
1197 depends on ADVANCED_OPTIONS && PPC_8xx && \
1198 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1201 bool "Pinned TLB for DATA"
1206 bool "Pinned TLB for IMMR"
1211 bool "Pinned TLB for TEXT"
1217 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1220 default "0xc000000000000000"
1223 default "0xc000000000000000"
1224 config PHYSICAL_START
1226 default "0x00000000"
1232 source "net/Kconfig"
1234 source "drivers/Kconfig"
1238 source "lib/Kconfig"
1240 source "arch/powerpc/Kconfig.debug"
1242 source "security/Kconfig"
1244 source "crypto/Kconfig"
1246 config PPC_LIB_RHEAP
1249 source "arch/powerpc/kvm/Kconfig"
1251 source "kernel/livepatch/Kconfig"