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_IRQ_SHOW
170 select GENERIC_IRQ_SHOW_LEVEL
171 select GENERIC_SMP_IDLE_THREAD
172 select GENERIC_STRNCPY_FROM_USER
173 select GENERIC_STRNLEN_USER
174 select GENERIC_TIME_VSYSCALL
175 select HAVE_ARCH_AUDITSYSCALL
176 select HAVE_ARCH_JUMP_LABEL
177 select HAVE_ARCH_KGDB
178 select HAVE_ARCH_MMAP_RND_BITS
179 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
180 select HAVE_ARCH_SECCOMP_FILTER
181 select HAVE_ARCH_TRACEHOOK
182 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
183 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
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)
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_EARLY_FLATTREE
230 select OF_RESERVED_MEM
231 select OLD_SIGACTION if PPC32
232 select OLD_SIGSUSPEND
234 select SYSCTL_EXCEPTION_TRACE
235 select VIRT_TO_BUS if !PPC64
237 # Please keep this list sorted alphabetically.
254 select COMPAT_BINFMT_ELF
255 select ARCH_WANT_OLD_COMPAT_IPC
256 select COMPAT_OLD_SIGACTION
258 config SYSVIPC_COMPAT
260 depends on COMPAT && SYSVIPC
263 # All PPC32s use generic nvram driver through ppc_md
268 config SCHED_OMIT_FRAME_POINTER
272 config ARCH_MAY_HAVE_PC_FDC
276 config PPC_UDBG_16550
280 config GENERIC_TBSYNC
282 default y if PPC32 && SMP
294 config SYS_SUPPORTS_APM_EMULATION
295 default y if PMAC_APM_EMU
301 Used to allow a board to specify it wants an ePAPR compliant wrapper.
304 config DEFAULT_UIMAGE
307 Used to allow a board to specify it wants a uImage built by default
310 config ARCH_HIBERNATION_POSSIBLE
314 config ARCH_SUSPEND_POSSIBLE
316 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
317 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
320 config PPC_DCR_NATIVE
330 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
333 config PPC_OF_PLATFORM_PCI
336 depends on PPC64 # not supported on 32 bits yet
339 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
340 depends on PPC32 || PPC_BOOK3S_64
343 config ARCH_SUPPORTS_UPROBES
346 config PPC_ADV_DEBUG_REGS
348 depends on 40x || BOOKE
351 config PPC_ADV_DEBUG_IACS
353 depends on PPC_ADV_DEBUG_REGS
357 config PPC_ADV_DEBUG_DACS
359 depends on PPC_ADV_DEBUG_REGS
362 config PPC_ADV_DEBUG_DVCS
364 depends on PPC_ADV_DEBUG_REGS
368 config PPC_ADV_DEBUG_DAC_RANGE
370 depends on PPC_ADV_DEBUG_REGS && 44x
377 config PGTABLE_LEVELS
380 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
383 source "init/Kconfig"
385 source "kernel/Kconfig.freezer"
387 source "arch/powerpc/sysdev/Kconfig"
388 source "arch/powerpc/platforms/Kconfig"
390 menu "Kernel options"
393 bool "High memory support"
396 source kernel/Kconfig.hz
397 source kernel/Kconfig.preempt
398 source "fs/Kconfig.binfmt"
400 config HUGETLB_PAGE_SIZE_VARIABLE
402 depends on HUGETLB_PAGE
405 config MATH_EMULATION
406 bool "Math emulation"
407 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
409 Some PowerPC chips designed for embedded applications do not have
410 a floating-point unit and therefore do not implement the
411 floating-point instructions in the PowerPC instruction set. If you
412 say Y here, the kernel will include code to emulate a floating-point
413 unit, which will allow programs that use floating-point
416 This is also useful to emulate missing (optional) instructions
417 such as fsqrt on cores that do have an FPU but do not implement
418 them (such as Freescale BookE).
421 prompt "Math emulation options"
422 default MATH_EMULATION_FULL
423 depends on MATH_EMULATION
425 config MATH_EMULATION_FULL
426 bool "Emulate all the floating point instructions"
428 Select this option will enable the kernel to support to emulate
429 all the floating point instructions. If your SoC doesn't have
430 a FPU, you should select this.
432 config MATH_EMULATION_HW_UNIMPLEMENTED
433 bool "Just emulate the FPU unimplemented instructions"
435 Select this if you know there does have a hardware FPU on your
436 SoC, but some floating point instructions are not implemented by that.
440 config PPC_TRANSACTIONAL_MEM
441 bool "Transactional Memory support for POWERPC"
442 depends on PPC_BOOK3S_64
448 Support user-mode Transactional Memory on POWERPC.
450 config LD_HEAD_STUB_CATCH
451 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
455 Very large kernels can cause linker branch stubs to be generated by
456 code in head_64.S, which moves the head text sections out of their
457 specified location. This option can work around the problem.
461 config DISABLE_MPROFILE_KERNEL
462 bool "Disable use of mprofile-kernel for kernel tracing"
463 depends on PPC64 && CPU_LITTLE_ENDIAN
466 Selecting this options disables use of the mprofile-kernel ABI for
467 kernel tracing. That will cause options such as live patching
468 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
471 If you have a toolchain which supports mprofile-kernel, then you can
472 disable this. Otherwise leave it enabled. If you're not sure, say
475 config MPROFILE_KERNEL
476 depends on PPC64 && CPU_LITTLE_ENDIAN
477 def_bool !DISABLE_MPROFILE_KERNEL
483 bool "SWIOTLB support"
487 Support for IO bounce buffering for systems without an IOMMU.
488 This allows us to DMA to the full physical address space on
489 platforms where the size of a physical address is larger
490 than the bus address. Not all platforms support this.
493 bool "Support for enabling/disabling CPUs"
494 depends on SMP && (PPC_PSERIES || \
495 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
497 Say Y here to be able to disable and re-enable individual
498 CPUs at runtime on SMP machines.
500 Say N if you are unsure.
502 config ARCH_CPU_PROBE_RELEASE
504 depends on HOTPLUG_CPU
506 config ARCH_ENABLE_MEMORY_HOTPLUG
509 config ARCH_HAS_WALK_MEMORY
512 config ARCH_ENABLE_MEMORY_HOTREMOVE
515 config PPC64_SUPPORTS_MEMORY_FAILURE
516 bool "Add support for memory hwpoison"
517 depends on PPC_BOOK3S_64
518 default "y" if PPC_POWERNV
519 select ARCH_SUPPORTS_MEMORY_FAILURE
522 bool "kexec system call"
523 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
526 kexec is a system call that implements the ability to shutdown your
527 current kernel, and to start another kernel. It is like a reboot
528 but it is independent of the system firmware. And like a reboot
529 you can start any kernel with it, not just Linux.
531 The name comes from the similarity to the exec system call.
533 It is an ongoing process to be certain the hardware in a machine
534 is properly shutdown, so do not be surprised if this code does not
535 initially work for you. As of this writing the exact hardware
536 interface is strongly in flux, so no good recommendation can be
540 bool "kexec file based system call"
542 select HAVE_IMA_KEXEC
546 depends on CRYPTO_SHA256=y
548 This is a new version of the kexec system call. This call is
549 file based and takes in file descriptors as system call arguments
550 for kernel and initramfs as opposed to a list of segments as is the
551 case for the older kexec call.
554 bool "Build a relocatable kernel"
555 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
556 select NONSTATIC_KERNEL
557 select MODULE_REL_CRCS if MODVERSIONS
559 This builds a kernel image that is capable of running at the
560 location the kernel is loaded at. For ppc32, there is no any
561 alignment restrictions, and this feature is a superset of
562 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
563 16k-aligned base address. The kernel is linked as a
564 position-independent executable (PIE) and contains dynamic relocations
565 which are processed early in the bootup process.
567 One use is for the kexec on panic case where the recovery kernel
568 must live at a different physical address than the primary
571 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
572 it has been loaded at and the compile time physical addresses
573 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
574 setting can still be useful to bootwrappers that need to know the
575 load address of the kernel (eg. u-boot/mkimage).
577 config RELOCATABLE_TEST
578 bool "Test relocatable kernel"
579 depends on (PPC64 && RELOCATABLE)
582 This runs the relocatable kernel at the address it was initially
583 loaded at, which tends to be non-zero and therefore test the
587 bool "Build a dump capture kernel"
588 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
589 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
591 Build a kernel suitable for use as a dump capture kernel.
592 The same kernel binary can be used as production kernel and dump
596 bool "Firmware-assisted dump"
597 depends on PPC64 && PPC_RTAS
601 A robust mechanism to get reliable kernel crash dump with
602 assistance from firmware. This approach does not use kexec,
603 instead firmware assists in booting the capture kernel
604 while preserving memory contents. Firmware-assisted dump
605 is meant to be a kdump replacement offering robustness and
606 speed not possible without system firmware assistance.
611 bool "Distribute interrupts on all CPUs by default"
614 This option gives the kernel permission to distribute IRQs across
615 multiple CPUs. Saying N here will route all IRQs to the first
616 CPU. Generally saying Y is safe, although some problems have been
617 reported with SMP Power Macintoshes with this option enabled.
622 default y if SMP && PPC_PSERIES
628 depends on NEED_MULTIPLE_NODES
630 config USE_PERCPU_NUMA_NODE_ID
634 config HAVE_MEMORYLESS_NODES
638 config ARCH_SELECT_MEMORY_MODEL
642 config ARCH_FLATMEM_ENABLE
644 depends on (PPC64 && !NUMA) || PPC32
646 config ARCH_SPARSEMEM_ENABLE
649 select SPARSEMEM_VMEMMAP_ENABLE
651 config ARCH_SPARSEMEM_DEFAULT
653 depends on PPC_BOOK3S_64
655 config SYS_SUPPORTS_HUGETLBFS
658 config ILLEGAL_POINTER_VALUE
660 # This is roughly half way between the top of user space and the bottom
661 # of kernel space, which seems about as good as we can get.
662 default 0x5deadbeef0000000 if PPC64
667 config ARCH_MEMORY_PROBE
669 depends on MEMORY_HOTPLUG
671 # Some NUMA nodes have memory ranges that span
672 # other nodes. Even though a pfn is valid and
673 # between a node's start and end pfns, it may not
674 # reside on that node. See memmap_init_zone()
676 config NODES_SPAN_OTHER_NODES
678 depends on NEED_MULTIPLE_NODES
681 bool "Using standard binutils settings"
685 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
686 Note, that kernel will be able to run only those applications,
687 which had been compiled using binutils later than 2.17.50.0.3 with
688 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
689 the older binutils, you can patch them with a trivial patch, which
690 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
696 Select the kernel logical page size. Increasing the page size
697 will reduce software overhead at each page boundary, allow
698 hardware prefetch mechanisms to be more effective, and allow
699 larger dma transfers increasing IO efficiency and reducing
700 overhead. However the utilization of memory will increase.
701 For example, each cached file will using a multiple of the
702 page size to hold its contents and the difference between the
703 end of file and the end of page is wasted.
705 Some dedicated systems, such as software raid serving with
706 accelerated calculations, have shown significant increases.
708 If you configure a 64 bit kernel for 64k pages but the
709 processor does not support them, then the kernel will simulate
710 them with 4k pages, loading them on demand, but with the
711 reduced software overhead and larger internal fragmentation.
712 For the 32 bit kernel, a large page option will not be offered
713 unless it is supported by the configured processor.
715 If unsure, choose 4K_PAGES.
719 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
723 depends on 44x || PPC_8xx
727 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
728 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
730 config PPC_256K_PAGES
731 bool "256k page size"
732 depends on 44x && !STDBINUTILS
734 Make the page size 256k.
736 As the ELF standard only requires alignment to support page
737 sizes up to 64k, you will need to compile all of your user
738 space applications with a non-standard binutils settings
739 (see the STDBINUTILS description for details).
741 Say N unless you know what you are doing.
746 int "Thread shift" if EXPERT
748 default "15" if PPC_256K_PAGES
749 default "14" if PPC64
752 Used to define the stack size. The default is almost always what you
753 want. Only change this if you know what you are doing.
755 config FORCE_MAX_ZONEORDER
756 int "Maximum zone order"
757 range 8 9 if PPC64 && PPC_64K_PAGES
758 default "9" if PPC64 && PPC_64K_PAGES
759 range 13 13 if PPC64 && !PPC_64K_PAGES
760 default "13" if PPC64 && !PPC_64K_PAGES
761 range 9 64 if PPC32 && PPC_16K_PAGES
762 default "9" if PPC32 && PPC_16K_PAGES
763 range 7 64 if PPC32 && PPC_64K_PAGES
764 default "7" if PPC32 && PPC_64K_PAGES
765 range 5 64 if PPC32 && PPC_256K_PAGES
766 default "5" if PPC32 && PPC_256K_PAGES
770 The kernel memory allocator divides physically contiguous memory
771 blocks into "zones", where each zone is a power of two number of
772 pages. This option selects the largest power of two that the kernel
773 keeps in the memory allocator. If you need to allocate very large
774 blocks of physically contiguous memory, then you may need to
777 This config option is actually maximum order plus one. For example,
778 a value of 11 means that the largest free memory block is 2^10 pages.
780 The page size is not necessarily 4KB. For example, on 64-bit
781 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
782 this in mind when choosing a value for this option.
784 config PPC_SUBPAGE_PROT
785 bool "Support setting protections for 4k subpages"
786 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
788 This option adds support for a system call to allow user programs
789 to set access permissions (read/write, readonly, or no access)
790 on the 4k subpages of each 64k page.
792 config PPC_COPRO_BASE
797 bool "SMT (Hyperthreading) scheduler support"
798 depends on PPC64 && SMP
800 SMT scheduler support improves the CPU scheduler's decision making
801 when dealing with POWER5 cpus at a cost of slightly increased
802 overhead in some places. If unsure say N here.
804 config PPC_DENORMALISATION
805 bool "PowerPC denormalisation exception handling"
806 depends on PPC_BOOK3S_64
807 default "y" if PPC_POWERNV
809 Add support for handling denormalisation of single precision
810 values. Useful for bare metal only. If unsure say Y here.
813 bool "Default bootloader kernel arguments"
816 string "Initial kernel command string"
817 depends on CMDLINE_BOOL
818 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
820 On some platforms, there is currently no way for the boot loader to
821 pass arguments to the kernel. For these platforms, you can supply
822 some command-line options at build time by entering them here. In
823 most cases you will need to specify the root device here.
826 bool "Always use the default kernel command string"
827 depends on CMDLINE_BOOL
829 Always use the default kernel command string, even if the boot
830 loader passes other arguments to the kernel.
831 This is useful if you cannot or don't want to change the
832 command-line options your boot loader passes to the kernel.
835 string "Additional default image types"
837 List additional targets to be built by the bootwrapper here (separated
838 by spaces). This is useful for targets that depend of device tree
839 files in the .dts directory.
841 Targets in this list will be build as part of the default build
842 target, or when the user does a 'make zImage' or a
843 'make zImage.initrd'.
845 If unsure, leave blank
847 config ARCH_WANTS_FREEZER_CONTROL
851 source kernel/power/Kconfig
854 bool "Enable seccomp to safely compute untrusted bytecode"
858 This kernel feature is useful for number crunching applications
859 that may need to compute untrusted bytecode during their
860 execution. By using pipes or other transports made available to
861 the process as file descriptors supporting the read/write
862 syscalls, it's possible to isolate those applications in
863 their own address space using seccomp. Once seccomp is
864 enabled via /proc/<pid>/seccomp, it cannot be disabled
865 and the task is only allowed to execute a few safe syscalls
866 defined by each seccomp mode.
868 If unsure, say Y. Only embedded should say N here.
879 bool "Support for ISA-bus hardware"
883 Find out whether you have ISA slots on your motherboard. ISA is the
884 name of a bus system, i.e. the way the CPU talks to the other stuff
885 inside your box. If you have an Apple machine, say N here; if you
886 have an IBM RS/6000 or pSeries machine, say Y. If you have an
887 embedded board, consult your board documentation.
893 config NEED_DMA_MAP_STATE
894 def_bool (PPC64 || NOT_COHERENT_CACHE)
896 config NEED_SG_DMA_LENGTH
899 config GENERIC_ISA_DMA
901 depends on ISA_DMA_API
904 config PPC_INDIRECT_PCI
907 default y if 40x || 44x
921 select PPC_INDIRECT_PCI
927 depends on SUSPEND && (PPC_85xx || PPC_86xx)
929 Freescale MPC85xx/MPC86xx power management controller support
930 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
935 depends on SUSPEND && (44x || 40x)
937 PPC4xx Clock Power Management (CPM) support (suspend/resume).
938 It also enables support for two different idle states (idle-wait
945 bool "Freescale Local Bus support"
947 Enables reporting of errors from the Freescale local bus
948 controller. Also contains some common code used by
949 drivers for specific local bus peripherals.
953 depends on PPC_83xx || QUICC_ENGINE || CPM2
955 Freescale General-purpose Timers support
957 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
961 # Platforms that what PCI turned unconditionally just do select PCI
962 # in their config node. Platforms that want to choose at config
963 # time should select PPC_PCI_CHOICE
964 config PPC_PCI_CHOICE
968 bool "PCI support" if PPC_PCI_CHOICE
969 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
970 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
971 default PCI_QSPAN if PPC_8xx
972 select GENERIC_PCI_IOMAP
974 Find out whether your system includes a PCI bus. PCI is the name of
975 a bus system, i.e. the way the CPU talks to the other stuff inside
976 your box. If you say Y here, the kernel will include drivers and
977 infrastructure code to support PCI bus devices.
990 Say Y here if you have a system based on a Motorola 8xx-series
991 embedded processor with a QSPAN PCI interface, otherwise say N.
995 depends on PCI && 8260
996 select PPC_INDIRECT_PCI
999 source "drivers/pci/Kconfig"
1001 source "drivers/pcmcia/Kconfig"
1008 tristate "RapidIO support"
1009 depends on HAS_RAPIDIO || PCI
1011 If you say Y here, the kernel will include drivers and
1012 infrastructure code to support RapidIO interconnect devices.
1015 bool "Freescale Embedded SRIO Controller support"
1016 depends on RAPIDIO = y && HAS_RAPIDIO
1019 Include support for RapidIO controller on Freescale embedded
1020 processors (MPC8548, MPC8641, etc).
1022 source "drivers/rapidio/Kconfig"
1026 config NONSTATIC_KERNEL
1030 menu "Advanced setup"
1033 config ADVANCED_OPTIONS
1034 bool "Prompt for advanced kernel configuration options"
1036 This option will enable prompting for a variety of advanced kernel
1037 configuration options. These options can cause the kernel to not
1038 work if they are set incorrectly, but can be used to optimize certain
1039 aspects of kernel memory management.
1041 Unless you know what you are doing, say N here.
1043 comment "Default settings for advanced configuration options are used"
1044 depends on !ADVANCED_OPTIONS
1046 config LOWMEM_SIZE_BOOL
1047 bool "Set maximum low memory"
1048 depends on ADVANCED_OPTIONS
1050 This option allows you to set the maximum amount of memory which
1051 will be used as "low memory", that is, memory which the kernel can
1052 access directly, without having to set up a kernel virtual mapping.
1053 This can be useful in optimizing the layout of kernel virtual
1056 Say N here unless you know what you are doing.
1059 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1060 default "0x30000000"
1062 config LOWMEM_CAM_NUM_BOOL
1063 bool "Set number of CAMs to use to map low memory"
1064 depends on ADVANCED_OPTIONS && FSL_BOOKE
1066 This option allows you to set the maximum number of CAM slots that
1067 will be used to map low memory. There are a limited number of slots
1068 available and even more limited number that will fit in the L1 MMU.
1069 However, using more entries will allow mapping more low memory. This
1070 can be useful in optimizing the layout of kernel virtual memory.
1072 Say N here unless you know what you are doing.
1074 config LOWMEM_CAM_NUM
1075 depends on FSL_BOOKE
1076 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1079 config DYNAMIC_MEMSTART
1080 bool "Enable page aligned dynamic load address for kernel"
1081 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1082 select NONSTATIC_KERNEL
1084 This option enables the kernel to be loaded at any page aligned
1085 physical address. The kernel creates a mapping from KERNELBASE to
1086 the address where the kernel is loaded. The page size here implies
1087 the TLB page size of the mapping for kernel on the particular platform.
1088 Please refer to the init code for finding the TLB page size.
1090 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1091 kernel image, where the only restriction is the page aligned kernel
1092 load address. When this option is enabled, the compile time physical
1093 address CONFIG_PHYSICAL_START is ignored.
1095 This option is overridden by CONFIG_RELOCATABLE
1097 config PAGE_OFFSET_BOOL
1098 bool "Set custom page offset address"
1099 depends on ADVANCED_OPTIONS
1101 This option allows you to set the kernel virtual address at which
1102 the kernel will map low memory. This can be useful in optimizing
1103 the virtual memory layout of the system.
1105 Say N here unless you know what you are doing.
1108 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1109 default "0xc0000000"
1111 config KERNEL_START_BOOL
1112 bool "Set custom kernel base address"
1113 depends on ADVANCED_OPTIONS
1115 This option allows you to set the kernel virtual address at which
1116 the kernel will be loaded. Normally this should match PAGE_OFFSET
1117 however there are times (like kdump) that one might not want them
1120 Say N here unless you know what you are doing.
1123 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1124 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1125 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1126 default "0xc0000000"
1128 config PHYSICAL_START_BOOL
1129 bool "Set physical address where the kernel is loaded"
1130 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1132 This gives the physical address where the kernel is loaded.
1134 Say N here unless you know what you are doing.
1136 config PHYSICAL_START
1137 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1138 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1139 default "0x00000000"
1141 config PHYSICAL_ALIGN
1143 default "0x04000000" if FSL_BOOKE
1145 This value puts the alignment restrictions on physical address
1146 where kernel is loaded and run from. Kernel is compiled for an
1147 address which meets above alignment restriction.
1149 config TASK_SIZE_BOOL
1150 bool "Set custom user task size"
1151 depends on ADVANCED_OPTIONS
1153 This option allows you to set the amount of virtual address space
1154 allocated to user tasks. This can be useful in optimizing the
1155 virtual memory layout of the system.
1157 Say N here unless you know what you are doing.
1160 hex "Size of user task space" if TASK_SIZE_BOOL
1161 default "0x80000000" if PPC_8xx
1162 default "0xc0000000"
1164 config CONSISTENT_SIZE_BOOL
1165 bool "Set custom consistent memory pool size"
1166 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1168 This option allows you to set the size of the
1169 consistent memory pool. This pool of virtual memory
1170 is used to make consistent memory allocations.
1172 config CONSISTENT_SIZE
1173 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1174 default "0x00200000" if NOT_COHERENT_CACHE
1177 bool "Pinned Kernel TLBs (860 ONLY)"
1178 depends on ADVANCED_OPTIONS && PPC_8xx && \
1179 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1182 bool "Pinned TLB for DATA"
1187 bool "Pinned TLB for IMMR"
1192 bool "Pinned TLB for TEXT"
1198 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1201 default "0xc000000000000000"
1204 default "0xc000000000000000"
1205 config PHYSICAL_START
1207 default "0x00000000"
1213 source "net/Kconfig"
1215 source "drivers/Kconfig"
1219 source "lib/Kconfig"
1221 source "arch/powerpc/Kconfig.debug"
1223 source "security/Kconfig"
1225 source "crypto/Kconfig"
1227 config PPC_LIB_RHEAP
1230 source "arch/powerpc/kvm/Kconfig"
1232 source "kernel/livepatch/Kconfig"