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_PMEM_API if PPC64
143 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
144 select ARCH_HAS_SG_CHAIN
145 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
146 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
147 select ARCH_HAS_UBSAN_SANITIZE_ALL
148 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
149 select ARCH_HAVE_NMI_SAFE_CMPXCHG
150 select ARCH_MIGHT_HAVE_PC_PARPORT
151 select ARCH_MIGHT_HAVE_PC_SERIO
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_WEAK_RELEASE_ACQUIRE
159 select BUILDTIME_EXTABLE_SORT
160 select CLONE_BACKWARDS
161 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
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_BOOK3S_64
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 ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
184 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
185 select HAVE_CBPF_JIT if !PPC64
186 select HAVE_CONTEXT_TRACKING if PPC64
187 select HAVE_DEBUG_KMEMLEAK
188 select HAVE_DEBUG_STACKOVERFLOW
189 select HAVE_DMA_API_DEBUG
190 select HAVE_DYNAMIC_FTRACE
191 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
192 select HAVE_EBPF_JIT if PPC64
193 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
194 select HAVE_FTRACE_MCOUNT_RECORD
195 select HAVE_FUNCTION_GRAPH_TRACER
196 select HAVE_FUNCTION_TRACER
197 select HAVE_GCC_PLUGINS
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
205 select HAVE_KPROBES_ON_FTRACE
206 select HAVE_KRETPROBES
207 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
209 select HAVE_MEMBLOCK_NODE_MAP
210 select HAVE_MOD_ARCH_SPECIFIC
211 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
212 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
214 select HAVE_OPTPROBES if PPC64
215 select HAVE_PERF_EVENTS
216 select HAVE_PERF_EVENTS_NMI if PPC64
217 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
218 select HAVE_PERF_REGS
219 select HAVE_PERF_USER_STACK_DUMP
220 select HAVE_RCU_TABLE_FREE if SMP
221 select HAVE_REGS_AND_STACK_ACCESS_API
222 select HAVE_SYSCALL_TRACEPOINTS
223 select HAVE_VIRT_CPU_ACCOUNTING
224 select HAVE_IRQ_TIME_ACCOUNTING
226 select IRQ_FORCED_THREADING
227 select MODULES_USE_ELF_RELA
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.
255 select COMPAT_BINFMT_ELF
256 select ARCH_WANT_OLD_COMPAT_IPC
257 select COMPAT_OLD_SIGACTION
259 config SYSVIPC_COMPAT
261 depends on COMPAT && SYSVIPC
264 # All PPC32s use generic nvram driver through ppc_md
269 config SCHED_OMIT_FRAME_POINTER
273 config ARCH_MAY_HAVE_PC_FDC
277 config PPC_UDBG_16550
281 config GENERIC_TBSYNC
283 default y if PPC32 && SMP
295 config SYS_SUPPORTS_APM_EMULATION
296 default y if PMAC_APM_EMU
302 Used to allow a board to specify it wants an ePAPR compliant wrapper.
305 config DEFAULT_UIMAGE
308 Used to allow a board to specify it wants a uImage built by default
311 config ARCH_HIBERNATION_POSSIBLE
315 config ARCH_SUSPEND_POSSIBLE
317 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
318 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
321 config PPC_DCR_NATIVE
331 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
334 config PPC_OF_PLATFORM_PCI
337 depends on PPC64 # not supported on 32 bits yet
340 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
341 depends on PPC32 || PPC_BOOK3S_64
344 config ARCH_SUPPORTS_UPROBES
347 config PPC_ADV_DEBUG_REGS
349 depends on 40x || BOOKE
352 config PPC_ADV_DEBUG_IACS
354 depends on PPC_ADV_DEBUG_REGS
358 config PPC_ADV_DEBUG_DACS
360 depends on PPC_ADV_DEBUG_REGS
363 config PPC_ADV_DEBUG_DVCS
365 depends on PPC_ADV_DEBUG_REGS
369 config PPC_ADV_DEBUG_DAC_RANGE
371 depends on PPC_ADV_DEBUG_REGS && 44x
378 config PGTABLE_LEVELS
381 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
384 source "init/Kconfig"
386 source "kernel/Kconfig.freezer"
388 source "arch/powerpc/sysdev/Kconfig"
389 source "arch/powerpc/platforms/Kconfig"
391 menu "Kernel options"
394 bool "High memory support"
397 source kernel/Kconfig.hz
398 source kernel/Kconfig.preempt
399 source "fs/Kconfig.binfmt"
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
449 Support user-mode Transactional Memory on POWERPC.
451 config LD_HEAD_STUB_CATCH
452 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
456 Very large kernels can cause linker branch stubs to be generated by
457 code in head_64.S, which moves the head text sections out of their
458 specified location. This option can work around the problem.
462 config DISABLE_MPROFILE_KERNEL
463 bool "Disable use of mprofile-kernel for kernel tracing"
464 depends on PPC64 && CPU_LITTLE_ENDIAN
467 Selecting this options disables use of the mprofile-kernel ABI for
468 kernel tracing. That will cause options such as live patching
469 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
472 If you have a toolchain which supports mprofile-kernel, then you can
473 disable this. Otherwise leave it enabled. If you're not sure, say
476 config MPROFILE_KERNEL
477 depends on PPC64 && CPU_LITTLE_ENDIAN
478 def_bool !DISABLE_MPROFILE_KERNEL
484 bool "SWIOTLB support"
488 Support for IO bounce buffering for systems without an IOMMU.
489 This allows us to DMA to the full physical address space on
490 platforms where the size of a physical address is larger
491 than the bus address. Not all platforms support this.
494 bool "Support for enabling/disabling CPUs"
495 depends on SMP && (PPC_PSERIES || \
496 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
498 Say Y here to be able to disable and re-enable individual
499 CPUs at runtime on SMP machines.
501 Say N if you are unsure.
503 config ARCH_CPU_PROBE_RELEASE
505 depends on HOTPLUG_CPU
507 config ARCH_ENABLE_MEMORY_HOTPLUG
510 config ARCH_HAS_WALK_MEMORY
513 config ARCH_ENABLE_MEMORY_HOTREMOVE
516 config PPC64_SUPPORTS_MEMORY_FAILURE
517 bool "Add support for memory hwpoison"
518 depends on PPC_BOOK3S_64
519 default "y" if PPC_POWERNV
520 select ARCH_SUPPORTS_MEMORY_FAILURE
523 bool "kexec system call"
524 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
527 kexec is a system call that implements the ability to shutdown your
528 current kernel, and to start another kernel. It is like a reboot
529 but it is independent of the system firmware. And like a reboot
530 you can start any kernel with it, not just Linux.
532 The name comes from the similarity to the exec system call.
534 It is an ongoing process to be certain the hardware in a machine
535 is properly shutdown, so do not be surprised if this code does not
536 initially work for you. As of this writing the exact hardware
537 interface is strongly in flux, so no good recommendation can be
541 bool "kexec file based system call"
543 select HAVE_IMA_KEXEC
547 depends on CRYPTO_SHA256=y
549 This is a new version of the kexec system call. This call is
550 file based and takes in file descriptors as system call arguments
551 for kernel and initramfs as opposed to a list of segments as is the
552 case for the older kexec call.
555 bool "Build a relocatable kernel"
556 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
557 select NONSTATIC_KERNEL
558 select MODULE_REL_CRCS if MODVERSIONS
560 This builds a kernel image that is capable of running at the
561 location the kernel is loaded at. For ppc32, there is no any
562 alignment restrictions, and this feature is a superset of
563 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
564 16k-aligned base address. The kernel is linked as a
565 position-independent executable (PIE) and contains dynamic relocations
566 which are processed early in the bootup process.
568 One use is for the kexec on panic case where the recovery kernel
569 must live at a different physical address than the primary
572 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
573 it has been loaded at and the compile time physical addresses
574 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
575 setting can still be useful to bootwrappers that need to know the
576 load address of the kernel (eg. u-boot/mkimage).
578 config RELOCATABLE_TEST
579 bool "Test relocatable kernel"
580 depends on (PPC64 && RELOCATABLE)
583 This runs the relocatable kernel at the address it was initially
584 loaded at, which tends to be non-zero and therefore test the
588 bool "Build a dump capture kernel"
589 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
590 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
592 Build a kernel suitable for use as a dump capture kernel.
593 The same kernel binary can be used as production kernel and dump
597 bool "Firmware-assisted dump"
598 depends on PPC64 && PPC_RTAS
602 A robust mechanism to get reliable kernel crash dump with
603 assistance from firmware. This approach does not use kexec,
604 instead firmware assists in booting the capture kernel
605 while preserving memory contents. Firmware-assisted dump
606 is meant to be a kdump replacement offering robustness and
607 speed not possible without system firmware assistance.
612 bool "Distribute interrupts on all CPUs by default"
615 This option gives the kernel permission to distribute IRQs across
616 multiple CPUs. Saying N here will route all IRQs to the first
617 CPU. Generally saying Y is safe, although some problems have been
618 reported with SMP Power Macintoshes with this option enabled.
623 default y if SMP && PPC_PSERIES
629 depends on NEED_MULTIPLE_NODES
631 config USE_PERCPU_NUMA_NODE_ID
635 config HAVE_MEMORYLESS_NODES
639 config ARCH_SELECT_MEMORY_MODEL
643 config ARCH_FLATMEM_ENABLE
645 depends on (PPC64 && !NUMA) || PPC32
647 config ARCH_SPARSEMEM_ENABLE
650 select SPARSEMEM_VMEMMAP_ENABLE
652 config ARCH_SPARSEMEM_DEFAULT
654 depends on PPC_BOOK3S_64
656 config SYS_SUPPORTS_HUGETLBFS
659 config ILLEGAL_POINTER_VALUE
661 # This is roughly half way between the top of user space and the bottom
662 # of kernel space, which seems about as good as we can get.
663 default 0x5deadbeef0000000 if PPC64
668 config ARCH_MEMORY_PROBE
670 depends on MEMORY_HOTPLUG
672 # Some NUMA nodes have memory ranges that span
673 # other nodes. Even though a pfn is valid and
674 # between a node's start and end pfns, it may not
675 # reside on that node. See memmap_init_zone()
677 config NODES_SPAN_OTHER_NODES
679 depends on NEED_MULTIPLE_NODES
682 bool "Using standard binutils settings"
686 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
687 Note, that kernel will be able to run only those applications,
688 which had been compiled using binutils later than 2.17.50.0.3 with
689 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
690 the older binutils, you can patch them with a trivial patch, which
691 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
697 Select the kernel logical page size. Increasing the page size
698 will reduce software overhead at each page boundary, allow
699 hardware prefetch mechanisms to be more effective, and allow
700 larger dma transfers increasing IO efficiency and reducing
701 overhead. However the utilization of memory will increase.
702 For example, each cached file will using a multiple of the
703 page size to hold its contents and the difference between the
704 end of file and the end of page is wasted.
706 Some dedicated systems, such as software raid serving with
707 accelerated calculations, have shown significant increases.
709 If you configure a 64 bit kernel for 64k pages but the
710 processor does not support them, then the kernel will simulate
711 them with 4k pages, loading them on demand, but with the
712 reduced software overhead and larger internal fragmentation.
713 For the 32 bit kernel, a large page option will not be offered
714 unless it is supported by the configured processor.
716 If unsure, choose 4K_PAGES.
720 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
724 depends on 44x || PPC_8xx
728 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
729 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
731 config PPC_256K_PAGES
732 bool "256k page size"
733 depends on 44x && !STDBINUTILS
735 Make the page size 256k.
737 As the ELF standard only requires alignment to support page
738 sizes up to 64k, you will need to compile all of your user
739 space applications with a non-standard binutils settings
740 (see the STDBINUTILS description for details).
742 Say N unless you know what you are doing.
747 int "Thread shift" if EXPERT
749 default "15" if PPC_256K_PAGES
750 default "14" if PPC64
753 Used to define the stack size. The default is almost always what you
754 want. Only change this if you know what you are doing.
756 config FORCE_MAX_ZONEORDER
757 int "Maximum zone order"
758 range 8 9 if PPC64 && PPC_64K_PAGES
759 default "9" if PPC64 && PPC_64K_PAGES
760 range 13 13 if PPC64 && !PPC_64K_PAGES
761 default "13" if PPC64 && !PPC_64K_PAGES
762 range 9 64 if PPC32 && PPC_16K_PAGES
763 default "9" if PPC32 && PPC_16K_PAGES
764 range 7 64 if PPC32 && PPC_64K_PAGES
765 default "7" if PPC32 && PPC_64K_PAGES
766 range 5 64 if PPC32 && PPC_256K_PAGES
767 default "5" if PPC32 && PPC_256K_PAGES
771 The kernel memory allocator divides physically contiguous memory
772 blocks into "zones", where each zone is a power of two number of
773 pages. This option selects the largest power of two that the kernel
774 keeps in the memory allocator. If you need to allocate very large
775 blocks of physically contiguous memory, then you may need to
778 This config option is actually maximum order plus one. For example,
779 a value of 11 means that the largest free memory block is 2^10 pages.
781 The page size is not necessarily 4KB. For example, on 64-bit
782 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
783 this in mind when choosing a value for this option.
785 config PPC_SUBPAGE_PROT
786 bool "Support setting protections for 4k subpages"
787 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
789 This option adds support for a system call to allow user programs
790 to set access permissions (read/write, readonly, or no access)
791 on the 4k subpages of each 64k page.
793 config PPC_COPRO_BASE
798 bool "SMT (Hyperthreading) scheduler support"
799 depends on PPC64 && SMP
801 SMT scheduler support improves the CPU scheduler's decision making
802 when dealing with POWER5 cpus at a cost of slightly increased
803 overhead in some places. If unsure say N here.
805 config PPC_DENORMALISATION
806 bool "PowerPC denormalisation exception handling"
807 depends on PPC_BOOK3S_64
808 default "y" if PPC_POWERNV
810 Add support for handling denormalisation of single precision
811 values. Useful for bare metal only. If unsure say Y here.
814 bool "Default bootloader kernel arguments"
817 string "Initial kernel command string"
818 depends on CMDLINE_BOOL
819 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
821 On some platforms, there is currently no way for the boot loader to
822 pass arguments to the kernel. For these platforms, you can supply
823 some command-line options at build time by entering them here. In
824 most cases you will need to specify the root device here.
827 bool "Always use the default kernel command string"
828 depends on CMDLINE_BOOL
830 Always use the default kernel command string, even if the boot
831 loader passes other arguments to the kernel.
832 This is useful if you cannot or don't want to change the
833 command-line options your boot loader passes to the kernel.
836 string "Additional default image types"
838 List additional targets to be built by the bootwrapper here (separated
839 by spaces). This is useful for targets that depend of device tree
840 files in the .dts directory.
842 Targets in this list will be build as part of the default build
843 target, or when the user does a 'make zImage' or a
844 'make zImage.initrd'.
846 If unsure, leave blank
848 config ARCH_WANTS_FREEZER_CONTROL
852 source kernel/power/Kconfig
855 bool "Enable seccomp to safely compute untrusted bytecode"
859 This kernel feature is useful for number crunching applications
860 that may need to compute untrusted bytecode during their
861 execution. By using pipes or other transports made available to
862 the process as file descriptors supporting the read/write
863 syscalls, it's possible to isolate those applications in
864 their own address space using seccomp. Once seccomp is
865 enabled via /proc/<pid>/seccomp, it cannot be disabled
866 and the task is only allowed to execute a few safe syscalls
867 defined by each seccomp mode.
869 If unsure, say Y. Only embedded should say N here.
880 bool "Support for ISA-bus hardware"
884 Find out whether you have ISA slots on your motherboard. ISA is the
885 name of a bus system, i.e. the way the CPU talks to the other stuff
886 inside your box. If you have an Apple machine, say N here; if you
887 have an IBM RS/6000 or pSeries machine, say Y. If you have an
888 embedded board, consult your board documentation.
894 config NEED_DMA_MAP_STATE
895 def_bool (PPC64 || NOT_COHERENT_CACHE)
897 config NEED_SG_DMA_LENGTH
900 config GENERIC_ISA_DMA
902 depends on ISA_DMA_API
905 config PPC_INDIRECT_PCI
908 default y if 40x || 44x
922 select PPC_INDIRECT_PCI
928 depends on SUSPEND && (PPC_85xx || PPC_86xx)
930 Freescale MPC85xx/MPC86xx power management controller support
931 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
936 depends on SUSPEND && (44x || 40x)
938 PPC4xx Clock Power Management (CPM) support (suspend/resume).
939 It also enables support for two different idle states (idle-wait
946 bool "Freescale Local Bus support"
948 Enables reporting of errors from the Freescale local bus
949 controller. Also contains some common code used by
950 drivers for specific local bus peripherals.
954 depends on PPC_83xx || QUICC_ENGINE || CPM2
956 Freescale General-purpose Timers support
958 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
962 # Platforms that what PCI turned unconditionally just do select PCI
963 # in their config node. Platforms that want to choose at config
964 # time should select PPC_PCI_CHOICE
965 config PPC_PCI_CHOICE
969 bool "PCI support" if PPC_PCI_CHOICE
970 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
971 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
972 default PCI_QSPAN if PPC_8xx
973 select GENERIC_PCI_IOMAP
975 Find out whether your system includes a PCI bus. PCI is the name of
976 a bus system, i.e. the way the CPU talks to the other stuff inside
977 your box. If you say Y here, the kernel will include drivers and
978 infrastructure code to support PCI bus devices.
991 Say Y here if you have a system based on a Motorola 8xx-series
992 embedded processor with a QSPAN PCI interface, otherwise say N.
996 depends on PCI && 8260
997 select PPC_INDIRECT_PCI
1000 source "drivers/pci/Kconfig"
1002 source "drivers/pcmcia/Kconfig"
1009 tristate "RapidIO support"
1010 depends on HAS_RAPIDIO || PCI
1012 If you say Y here, the kernel will include drivers and
1013 infrastructure code to support RapidIO interconnect devices.
1016 bool "Freescale Embedded SRIO Controller support"
1017 depends on RAPIDIO = y && HAS_RAPIDIO
1020 Include support for RapidIO controller on Freescale embedded
1021 processors (MPC8548, MPC8641, etc).
1023 source "drivers/rapidio/Kconfig"
1027 config NONSTATIC_KERNEL
1031 menu "Advanced setup"
1034 config ADVANCED_OPTIONS
1035 bool "Prompt for advanced kernel configuration options"
1037 This option will enable prompting for a variety of advanced kernel
1038 configuration options. These options can cause the kernel to not
1039 work if they are set incorrectly, but can be used to optimize certain
1040 aspects of kernel memory management.
1042 Unless you know what you are doing, say N here.
1044 comment "Default settings for advanced configuration options are used"
1045 depends on !ADVANCED_OPTIONS
1047 config LOWMEM_SIZE_BOOL
1048 bool "Set maximum low memory"
1049 depends on ADVANCED_OPTIONS
1051 This option allows you to set the maximum amount of memory which
1052 will be used as "low memory", that is, memory which the kernel can
1053 access directly, without having to set up a kernel virtual mapping.
1054 This can be useful in optimizing the layout of kernel virtual
1057 Say N here unless you know what you are doing.
1060 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1061 default "0x30000000"
1063 config LOWMEM_CAM_NUM_BOOL
1064 bool "Set number of CAMs to use to map low memory"
1065 depends on ADVANCED_OPTIONS && FSL_BOOKE
1067 This option allows you to set the maximum number of CAM slots that
1068 will be used to map low memory. There are a limited number of slots
1069 available and even more limited number that will fit in the L1 MMU.
1070 However, using more entries will allow mapping more low memory. This
1071 can be useful in optimizing the layout of kernel virtual memory.
1073 Say N here unless you know what you are doing.
1075 config LOWMEM_CAM_NUM
1076 depends on FSL_BOOKE
1077 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1080 config DYNAMIC_MEMSTART
1081 bool "Enable page aligned dynamic load address for kernel"
1082 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1083 select NONSTATIC_KERNEL
1085 This option enables the kernel to be loaded at any page aligned
1086 physical address. The kernel creates a mapping from KERNELBASE to
1087 the address where the kernel is loaded. The page size here implies
1088 the TLB page size of the mapping for kernel on the particular platform.
1089 Please refer to the init code for finding the TLB page size.
1091 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1092 kernel image, where the only restriction is the page aligned kernel
1093 load address. When this option is enabled, the compile time physical
1094 address CONFIG_PHYSICAL_START is ignored.
1096 This option is overridden by CONFIG_RELOCATABLE
1098 config PAGE_OFFSET_BOOL
1099 bool "Set custom page offset address"
1100 depends on ADVANCED_OPTIONS
1102 This option allows you to set the kernel virtual address at which
1103 the kernel will map low memory. This can be useful in optimizing
1104 the virtual memory layout of the system.
1106 Say N here unless you know what you are doing.
1109 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1110 default "0xc0000000"
1112 config KERNEL_START_BOOL
1113 bool "Set custom kernel base address"
1114 depends on ADVANCED_OPTIONS
1116 This option allows you to set the kernel virtual address at which
1117 the kernel will be loaded. Normally this should match PAGE_OFFSET
1118 however there are times (like kdump) that one might not want them
1121 Say N here unless you know what you are doing.
1124 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1125 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1126 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1127 default "0xc0000000"
1129 config PHYSICAL_START_BOOL
1130 bool "Set physical address where the kernel is loaded"
1131 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1133 This gives the physical address where the kernel is loaded.
1135 Say N here unless you know what you are doing.
1137 config PHYSICAL_START
1138 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1139 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1140 default "0x00000000"
1142 config PHYSICAL_ALIGN
1144 default "0x04000000" if FSL_BOOKE
1146 This value puts the alignment restrictions on physical address
1147 where kernel is loaded and run from. Kernel is compiled for an
1148 address which meets above alignment restriction.
1150 config TASK_SIZE_BOOL
1151 bool "Set custom user task size"
1152 depends on ADVANCED_OPTIONS
1154 This option allows you to set the amount of virtual address space
1155 allocated to user tasks. This can be useful in optimizing the
1156 virtual memory layout of the system.
1158 Say N here unless you know what you are doing.
1161 hex "Size of user task space" if TASK_SIZE_BOOL
1162 default "0x80000000" if PPC_8xx
1163 default "0xc0000000"
1165 config CONSISTENT_SIZE_BOOL
1166 bool "Set custom consistent memory pool size"
1167 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1169 This option allows you to set the size of the
1170 consistent memory pool. This pool of virtual memory
1171 is used to make consistent memory allocations.
1173 config CONSISTENT_SIZE
1174 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1175 default "0x00200000" if NOT_COHERENT_CACHE
1178 bool "Pinned Kernel TLBs (860 ONLY)"
1179 depends on ADVANCED_OPTIONS && PPC_8xx && \
1180 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1183 bool "Pinned TLB for DATA"
1188 bool "Pinned TLB for IMMR"
1193 bool "Pinned TLB for TEXT"
1199 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1202 default "0xc000000000000000"
1205 default "0xc000000000000000"
1206 config PHYSICAL_START
1208 default "0x00000000"
1214 source "net/Kconfig"
1216 source "drivers/Kconfig"
1220 source "lib/Kconfig"
1222 source "arch/powerpc/Kconfig.debug"
1224 source "security/Kconfig"
1226 source "crypto/Kconfig"
1228 config PPC_LIB_RHEAP
1231 source "arch/powerpc/kvm/Kconfig"
1233 source "kernel/livepatch/Kconfig"