1 source "arch/powerpc/platforms/Kconfig.cputype"
15 config ARCH_PHYS_ADDR_T_64BIT
16 def_bool PPC64 || PHYS_64BIT
18 config ARCH_DMA_ADDR_T_64BIT
19 def_bool ARCH_PHYS_ADDR_T_64BIT
25 config ARCH_MMAP_RND_BITS_MAX
26 # On Book3S 64, the default virtual address space for 64-bit processes
27 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
28 # 32T of address space (2^45), which should ensure a reasonable gap
29 # between bottom-up and top-down allocations for applications that
30 # consume "normal" amounts of address space. Book3S 64 only supports 64K
32 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
33 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
35 # On all other 64-bit platforms (currently only Book3E), the virtual
36 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
37 # of address space (2^44). Only 4K page sizes are supported.
38 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
40 # For 32-bit, use the compat values, as they're the same.
41 default ARCH_MMAP_RND_COMPAT_BITS_MAX
43 config ARCH_MMAP_RND_BITS_MIN
44 # Allow randomisation to consume up to 1GB of address space (2^30).
45 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
46 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
48 # For 32-bit, use the compat values, as they're the same.
49 default ARCH_MMAP_RND_COMPAT_BITS_MIN
51 config ARCH_MMAP_RND_COMPAT_BITS_MAX
52 # Total virtual address space for 32-bit processes is 2^31 (2GB).
53 # Allow randomisation to consume up to 512MB of address space (2^29).
54 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
55 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
56 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
57 default 17 # 17 = 29 (512MB) - 12 (4K)
59 config ARCH_MMAP_RND_COMPAT_BITS_MIN
60 # Total virtual address space for 32-bit processes is 2^31 (2GB).
61 # Allow randomisation to consume up to 8MB of address space (2^23).
62 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
63 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
64 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
65 default 11 # 11 = 23 (8MB) - 12 (4K)
67 config HAVE_SETUP_PER_CPU_AREA
70 config NEED_PER_CPU_EMBED_FIRST_CHUNK
74 int "Number of virtual interrupt numbers"
78 This defines the number of virtual interrupt numbers the kernel
79 can manage. Virtual interrupt numbers are what you see in
80 /proc/interrupts. If you configure your system to have too few,
81 drivers will fail to load or worse - handle with care.
85 depends on SMP && (DEBUGGER || KEXEC_CORE)
88 config STACKTRACE_SUPPORT
92 config TRACE_IRQFLAGS_SUPPORT
96 config LOCKDEP_SUPPORT
100 config RWSEM_GENERIC_SPINLOCK
103 config RWSEM_XCHGADD_ALGORITHM
107 config GENERIC_LOCKBREAK
110 depends on SMP && PREEMPT
112 config ARCH_HAS_ILOG2_U32
116 config ARCH_HAS_ILOG2_U64
120 config GENERIC_HWEIGHT
124 config ARCH_HAS_DMA_SET_COHERENT_MASK
131 # Please keep this list sorted alphabetically.
133 select ARCH_HAS_DEVMEM_IS_ALLOWED
134 select ARCH_HAS_DMA_SET_COHERENT_MASK
135 select ARCH_HAS_ELF_RANDOMIZE
136 select ARCH_HAS_GCOV_PROFILE_ALL
137 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
138 select ARCH_HAS_SG_CHAIN
139 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
140 select ARCH_HAS_UBSAN_SANITIZE_ALL
141 select ARCH_HAVE_NMI_SAFE_CMPXCHG
142 select ARCH_MIGHT_HAVE_PC_PARPORT
143 select ARCH_MIGHT_HAVE_PC_SERIO
144 select ARCH_SUPPORTS_ATOMIC_RMW
145 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
146 select ARCH_USE_BUILTIN_BSWAP
147 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
148 select ARCH_WANT_IPC_PARSE_VERSION
150 select BUILDTIME_EXTABLE_SORT
151 select CLONE_BACKWARDS
152 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
153 select EDAC_ATOMIC_SCRUB
155 select GENERIC_ATOMIC64 if PPC32
156 select GENERIC_CLOCKEVENTS
157 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
158 select GENERIC_CMOS_UPDATE
159 select GENERIC_CPU_AUTOPROBE
160 select GENERIC_IRQ_SHOW
161 select GENERIC_IRQ_SHOW_LEVEL
162 select GENERIC_SMP_IDLE_THREAD
163 select GENERIC_STRNCPY_FROM_USER
164 select GENERIC_STRNLEN_USER
165 select GENERIC_TIME_VSYSCALL_OLD
166 select HAVE_ARCH_AUDITSYSCALL
167 select HAVE_ARCH_HARDENED_USERCOPY
168 select HAVE_ARCH_JUMP_LABEL
169 select HAVE_ARCH_KGDB
170 select HAVE_ARCH_MMAP_RND_BITS
171 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
172 select HAVE_ARCH_SECCOMP_FILTER
173 select HAVE_ARCH_TRACEHOOK
174 select HAVE_CBPF_JIT if !PPC64
175 select HAVE_CONTEXT_TRACKING if PPC64
176 select HAVE_DEBUG_KMEMLEAK
177 select HAVE_DEBUG_STACKOVERFLOW
178 select HAVE_DMA_API_DEBUG
179 select HAVE_DYNAMIC_FTRACE
180 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
181 select HAVE_EBPF_JIT if PPC64
182 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
183 select HAVE_FTRACE_MCOUNT_RECORD
184 select HAVE_FUNCTION_GRAPH_TRACER
185 select HAVE_FUNCTION_TRACER
186 select HAVE_GCC_PLUGINS
187 select HAVE_GENERIC_RCU_GUP
188 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
190 select HAVE_IOREMAP_PROT
191 select HAVE_IRQ_EXIT_ON_IRQ_STACK
192 select HAVE_KERNEL_GZIP
194 select HAVE_KPROBES_ON_FTRACE
195 select HAVE_KRETPROBES
196 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
198 select HAVE_MEMBLOCK_NODE_MAP
199 select HAVE_MOD_ARCH_SPECIFIC
200 select HAVE_NMI if PERF_EVENTS
202 select HAVE_OPTPROBES if PPC64
203 select HAVE_PERF_EVENTS
204 select HAVE_PERF_EVENTS_NMI if PPC64
205 select HAVE_PERF_REGS
206 select HAVE_PERF_USER_STACK_DUMP
207 select HAVE_RCU_TABLE_FREE if SMP
208 select HAVE_REGS_AND_STACK_ACCESS_API
209 select HAVE_SYSCALL_TRACEPOINTS
210 select HAVE_VIRT_CPU_ACCOUNTING
212 select IRQ_FORCED_THREADING
213 select MODULES_USE_ELF_RELA
216 select OF_EARLY_FLATTREE
217 select OF_RESERVED_MEM
218 select OLD_SIGACTION if PPC32
219 select OLD_SIGSUSPEND
221 select SYSCTL_EXCEPTION_TRACE
222 select VIRT_TO_BUS if !PPC64
224 # Please keep this list sorted alphabetically.
241 select COMPAT_BINFMT_ELF
242 select ARCH_WANT_OLD_COMPAT_IPC
243 select COMPAT_OLD_SIGACTION
245 config SYSVIPC_COMPAT
247 depends on COMPAT && SYSVIPC
250 # All PPC32s use generic nvram driver through ppc_md
255 config SCHED_OMIT_FRAME_POINTER
259 config ARCH_MAY_HAVE_PC_FDC
263 config PPC_UDBG_16550
267 config GENERIC_TBSYNC
269 default y if PPC32 && SMP
281 config SYS_SUPPORTS_APM_EMULATION
282 default y if PMAC_APM_EMU
288 Used to allow a board to specify it wants an ePAPR compliant wrapper.
291 config DEFAULT_UIMAGE
294 Used to allow a board to specify it wants a uImage built by default
297 config ARCH_HIBERNATION_POSSIBLE
301 config ARCH_SUSPEND_POSSIBLE
303 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
304 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
307 config PPC_DCR_NATIVE
317 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
320 config PPC_OF_PLATFORM_PCI
323 depends on PPC64 # not supported on 32 bits yet
326 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
327 depends on PPC32 || PPC_STD_MMU_64
330 config ARCH_SUPPORTS_UPROBES
333 config PPC_ADV_DEBUG_REGS
335 depends on 40x || BOOKE
338 config PPC_ADV_DEBUG_IACS
340 depends on PPC_ADV_DEBUG_REGS
344 config PPC_ADV_DEBUG_DACS
346 depends on PPC_ADV_DEBUG_REGS
349 config PPC_ADV_DEBUG_DVCS
351 depends on PPC_ADV_DEBUG_REGS
355 config PPC_ADV_DEBUG_DAC_RANGE
357 depends on PPC_ADV_DEBUG_REGS && 44x
360 config PPC_EMULATE_SSTEP
362 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
368 config PGTABLE_LEVELS
371 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
374 source "init/Kconfig"
376 source "kernel/Kconfig.freezer"
378 source "arch/powerpc/sysdev/Kconfig"
379 source "arch/powerpc/platforms/Kconfig"
381 menu "Kernel options"
384 bool "High memory support"
387 source kernel/Kconfig.hz
388 source kernel/Kconfig.preempt
389 source "fs/Kconfig.binfmt"
391 config HUGETLB_PAGE_SIZE_VARIABLE
393 depends on HUGETLB_PAGE
396 config MATH_EMULATION
397 bool "Math emulation"
398 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
400 Some PowerPC chips designed for embedded applications do not have
401 a floating-point unit and therefore do not implement the
402 floating-point instructions in the PowerPC instruction set. If you
403 say Y here, the kernel will include code to emulate a floating-point
404 unit, which will allow programs that use floating-point
407 This is also useful to emulate missing (optional) instructions
408 such as fsqrt on cores that do have an FPU but do not implement
409 them (such as Freescale BookE).
412 prompt "Math emulation options"
413 default MATH_EMULATION_FULL
414 depends on MATH_EMULATION
416 config MATH_EMULATION_FULL
417 bool "Emulate all the floating point instructions"
419 Select this option will enable the kernel to support to emulate
420 all the floating point instructions. If your SoC doesn't have
421 a FPU, you should select this.
423 config MATH_EMULATION_HW_UNIMPLEMENTED
424 bool "Just emulate the FPU unimplemented instructions"
426 Select this if you know there does have a hardware FPU on your
427 SoC, but some floating point instructions are not implemented by that.
431 config PPC_TRANSACTIONAL_MEM
432 bool "Transactional Memory support for POWERPC"
433 depends on PPC_BOOK3S_64
439 Support user-mode Transactional Memory on POWERPC.
441 config DISABLE_MPROFILE_KERNEL
442 bool "Disable use of mprofile-kernel for kernel tracing"
443 depends on PPC64 && CPU_LITTLE_ENDIAN
446 Selecting this options disables use of the mprofile-kernel ABI for
447 kernel tracing. That will cause options such as live patching
448 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
451 If you have a toolchain which supports mprofile-kernel, then you can
452 disable this. Otherwise leave it enabled. If you're not sure, say
455 config MPROFILE_KERNEL
456 depends on PPC64 && CPU_LITTLE_ENDIAN
457 def_bool !DISABLE_MPROFILE_KERNEL
459 config USE_THIN_ARCHIVES
460 bool "Build the kernel using thin archives"
464 Build the kernel using thin archives.
465 If you're unsure say N.
471 bool "SWIOTLB support"
475 Support for IO bounce buffering for systems without an IOMMU.
476 This allows us to DMA to the full physical address space on
477 platforms where the size of a physical address is larger
478 than the bus address. Not all platforms support this.
481 bool "Support for enabling/disabling CPUs"
482 depends on SMP && (PPC_PSERIES || \
483 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
485 Say Y here to be able to disable and re-enable individual
486 CPUs at runtime on SMP machines.
488 Say N if you are unsure.
490 config ARCH_CPU_PROBE_RELEASE
492 depends on HOTPLUG_CPU
494 config ARCH_ENABLE_MEMORY_HOTPLUG
497 config ARCH_HAS_WALK_MEMORY
500 config ARCH_ENABLE_MEMORY_HOTREMOVE
503 config PPC64_SUPPORTS_MEMORY_FAILURE
504 bool "Add support for memory hwpoison"
505 depends on PPC_BOOK3S_64
506 default "y" if PPC_POWERNV
507 select ARCH_SUPPORTS_MEMORY_FAILURE
510 bool "kexec system call"
511 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
514 kexec is a system call that implements the ability to shutdown your
515 current kernel, and to start another kernel. It is like a reboot
516 but it is independent of the system firmware. And like a reboot
517 you can start any kernel with it, not just Linux.
519 The name comes from the similarity to the exec system call.
521 It is an ongoing process to be certain the hardware in a machine
522 is properly shutdown, so do not be surprised if this code does not
523 initially work for you. As of this writing the exact hardware
524 interface is strongly in flux, so no good recommendation can be
528 bool "kexec file based system call"
530 select HAVE_IMA_KEXEC
534 depends on CRYPTO_SHA256=y
536 This is a new version of the kexec system call. This call is
537 file based and takes in file descriptors as system call arguments
538 for kernel and initramfs as opposed to a list of segments as is the
539 case for the older kexec call.
542 bool "Build a relocatable kernel"
543 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
544 select NONSTATIC_KERNEL
545 select MODULE_REL_CRCS if MODVERSIONS
547 This builds a kernel image that is capable of running at the
548 location the kernel is loaded at. For ppc32, there is no any
549 alignment restrictions, and this feature is a superset of
550 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
551 16k-aligned base address. The kernel is linked as a
552 position-independent executable (PIE) and contains dynamic relocations
553 which are processed early in the bootup process.
555 One use is for the kexec on panic case where the recovery kernel
556 must live at a different physical address than the primary
559 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
560 it has been loaded at and the compile time physical addresses
561 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
562 setting can still be useful to bootwrappers that need to know the
563 load address of the kernel (eg. u-boot/mkimage).
565 config RELOCATABLE_TEST
566 bool "Test relocatable kernel"
567 depends on (PPC64 && RELOCATABLE)
570 This runs the relocatable kernel at the address it was initially
571 loaded at, which tends to be non-zero and therefore test the
575 bool "Build a kdump crash kernel"
576 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
577 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
579 Build a kernel suitable for use as a kdump capture kernel.
580 The same kernel binary can be used as production kernel and dump
584 bool "Firmware-assisted dump"
585 depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC_CORE
587 A robust mechanism to get reliable kernel crash dump with
588 assistance from firmware. This approach does not use kexec,
589 instead firmware assists in booting the kdump kernel
590 while preserving memory contents. Firmware-assisted dump
591 is meant to be a kdump replacement offering robustness and
592 speed not possible without system firmware assistance.
597 bool "Distribute interrupts on all CPUs by default"
600 This option gives the kernel permission to distribute IRQs across
601 multiple CPUs. Saying N here will route all IRQs to the first
602 CPU. Generally saying Y is safe, although some problems have been
603 reported with SMP Power Macintoshes with this option enabled.
608 default y if SMP && PPC_PSERIES
614 depends on NEED_MULTIPLE_NODES
616 config USE_PERCPU_NUMA_NODE_ID
620 config HAVE_MEMORYLESS_NODES
624 config ARCH_SELECT_MEMORY_MODEL
628 config ARCH_FLATMEM_ENABLE
630 depends on (PPC64 && !NUMA) || PPC32
632 config ARCH_SPARSEMEM_ENABLE
635 select SPARSEMEM_VMEMMAP_ENABLE
637 config ARCH_SPARSEMEM_DEFAULT
639 depends on PPC_BOOK3S_64
641 config SYS_SUPPORTS_HUGETLBFS
644 config ILLEGAL_POINTER_VALUE
646 # This is roughly half way between the top of user space and the bottom
647 # of kernel space, which seems about as good as we can get.
648 default 0x5deadbeef0000000 if PPC64
653 config ARCH_MEMORY_PROBE
655 depends on MEMORY_HOTPLUG
657 # Some NUMA nodes have memory ranges that span
658 # other nodes. Even though a pfn is valid and
659 # between a node's start and end pfns, it may not
660 # reside on that node. See memmap_init_zone()
662 config NODES_SPAN_OTHER_NODES
664 depends on NEED_MULTIPLE_NODES
667 bool "Using standard binutils settings"
671 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
672 Note, that kernel will be able to run only those applications,
673 which had been compiled using binutils later than 2.17.50.0.3 with
674 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
675 the older binutils, you can patch them with a trivial patch, which
676 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
682 Select the kernel logical page size. Increasing the page size
683 will reduce software overhead at each page boundary, allow
684 hardware prefetch mechanisms to be more effective, and allow
685 larger dma transfers increasing IO efficiency and reducing
686 overhead. However the utilization of memory will increase.
687 For example, each cached file will using a multiple of the
688 page size to hold its contents and the difference between the
689 end of file and the end of page is wasted.
691 Some dedicated systems, such as software raid serving with
692 accelerated calculations, have shown significant increases.
694 If you configure a 64 bit kernel for 64k pages but the
695 processor does not support them, then the kernel will simulate
696 them with 4k pages, loading them on demand, but with the
697 reduced software overhead and larger internal fragmentation.
698 For the 32 bit kernel, a large page option will not be offered
699 unless it is supported by the configured processor.
701 If unsure, choose 4K_PAGES.
705 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
709 depends on 44x || PPC_8xx
713 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
714 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
716 config PPC_256K_PAGES
717 bool "256k page size"
718 depends on 44x && !STDBINUTILS
720 Make the page size 256k.
722 As the ELF standard only requires alignment to support page
723 sizes up to 64k, you will need to compile all of your user
724 space applications with a non-standard binutils settings
725 (see the STDBINUTILS description for details).
727 Say N unless you know what you are doing.
732 int "Thread shift" if EXPERT
734 default "15" if PPC_256K_PAGES
735 default "14" if PPC64
738 Used to define the stack size. The default is almost always what you
739 want. Only change this if you know what you are doing.
741 config FORCE_MAX_ZONEORDER
742 int "Maximum zone order"
743 range 8 9 if PPC64 && PPC_64K_PAGES
744 default "9" if PPC64 && PPC_64K_PAGES
745 range 13 13 if PPC64 && !PPC_64K_PAGES
746 default "13" if PPC64 && !PPC_64K_PAGES
747 range 9 64 if PPC32 && PPC_16K_PAGES
748 default "9" if PPC32 && PPC_16K_PAGES
749 range 7 64 if PPC32 && PPC_64K_PAGES
750 default "7" if PPC32 && PPC_64K_PAGES
751 range 5 64 if PPC32 && PPC_256K_PAGES
752 default "5" if PPC32 && PPC_256K_PAGES
756 The kernel memory allocator divides physically contiguous memory
757 blocks into "zones", where each zone is a power of two number of
758 pages. This option selects the largest power of two that the kernel
759 keeps in the memory allocator. If you need to allocate very large
760 blocks of physically contiguous memory, then you may need to
763 This config option is actually maximum order plus one. For example,
764 a value of 11 means that the largest free memory block is 2^10 pages.
766 The page size is not necessarily 4KB. For example, on 64-bit
767 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
768 this in mind when choosing a value for this option.
770 config PPC_SUBPAGE_PROT
771 bool "Support setting protections for 4k subpages"
772 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
774 This option adds support for a system call to allow user programs
775 to set access permissions (read/write, readonly, or no access)
776 on the 4k subpages of each 64k page.
778 config PPC_COPRO_BASE
783 bool "SMT (Hyperthreading) scheduler support"
784 depends on PPC64 && SMP
786 SMT scheduler support improves the CPU scheduler's decision making
787 when dealing with POWER5 cpus at a cost of slightly increased
788 overhead in some places. If unsure say N here.
790 config PPC_DENORMALISATION
791 bool "PowerPC denormalisation exception handling"
792 depends on PPC_BOOK3S_64
793 default "y" if PPC_POWERNV
795 Add support for handling denormalisation of single precision
796 values. Useful for bare metal only. If unsure say Y here.
799 bool "Default bootloader kernel arguments"
802 string "Initial kernel command string"
803 depends on CMDLINE_BOOL
804 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
806 On some platforms, there is currently no way for the boot loader to
807 pass arguments to the kernel. For these platforms, you can supply
808 some command-line options at build time by entering them here. In
809 most cases you will need to specify the root device here.
812 bool "Always use the default kernel command string"
813 depends on CMDLINE_BOOL
815 Always use the default kernel command string, even if the boot
816 loader passes other arguments to the kernel.
817 This is useful if you cannot or don't want to change the
818 command-line options your boot loader passes to the kernel.
821 string "Additional default image types"
823 List additional targets to be built by the bootwrapper here (separated
824 by spaces). This is useful for targets that depend of device tree
825 files in the .dts directory.
827 Targets in this list will be build as part of the default build
828 target, or when the user does a 'make zImage' or a
829 'make zImage.initrd'.
831 If unsure, leave blank
833 config ARCH_WANTS_FREEZER_CONTROL
837 source kernel/power/Kconfig
840 bool "Enable seccomp to safely compute untrusted bytecode"
844 This kernel feature is useful for number crunching applications
845 that may need to compute untrusted bytecode during their
846 execution. By using pipes or other transports made available to
847 the process as file descriptors supporting the read/write
848 syscalls, it's possible to isolate those applications in
849 their own address space using seccomp. Once seccomp is
850 enabled via /proc/<pid>/seccomp, it cannot be disabled
851 and the task is only allowed to execute a few safe syscalls
852 defined by each seccomp mode.
854 If unsure, say Y. Only embedded should say N here.
865 bool "Support for ISA-bus hardware"
869 Find out whether you have ISA slots on your motherboard. ISA is the
870 name of a bus system, i.e. the way the CPU talks to the other stuff
871 inside your box. If you have an Apple machine, say N here; if you
872 have an IBM RS/6000 or pSeries machine, say Y. If you have an
873 embedded board, consult your board documentation.
879 config NEED_DMA_MAP_STATE
880 def_bool (PPC64 || NOT_COHERENT_CACHE)
882 config NEED_SG_DMA_LENGTH
885 config GENERIC_ISA_DMA
887 depends on ISA_DMA_API
890 config PPC_INDIRECT_PCI
893 default y if 40x || 44x
907 select PPC_INDIRECT_PCI
913 depends on SUSPEND && (PPC_85xx || PPC_86xx)
915 Freescale MPC85xx/MPC86xx power management controller support
916 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
921 depends on SUSPEND && (44x || 40x)
923 PPC4xx Clock Power Management (CPM) support (suspend/resume).
924 It also enables support for two different idle states (idle-wait
931 bool "Freescale Local Bus support"
933 Enables reporting of errors from the Freescale local bus
934 controller. Also contains some common code used by
935 drivers for specific local bus peripherals.
939 depends on PPC_83xx || QUICC_ENGINE || CPM2
941 Freescale General-purpose Timers support
943 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
947 # Platforms that what PCI turned unconditionally just do select PCI
948 # in their config node. Platforms that want to choose at config
949 # time should select PPC_PCI_CHOICE
950 config PPC_PCI_CHOICE
954 bool "PCI support" if PPC_PCI_CHOICE
955 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
956 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
957 default PCI_QSPAN if !4xx && !CPM2 && 8xx
958 select GENERIC_PCI_IOMAP
960 Find out whether your system includes a PCI bus. PCI is the name of
961 a bus system, i.e. the way the CPU talks to the other stuff inside
962 your box. If you say Y here, the kernel will include drivers and
963 infrastructure code to support PCI bus devices.
973 depends on !4xx && !CPM2 && 8xx
976 Say Y here if you have a system based on a Motorola 8xx-series
977 embedded processor with a QSPAN PCI interface, otherwise say N.
981 depends on PCI && 8260
982 select PPC_INDIRECT_PCI
985 source "drivers/pci/Kconfig"
987 source "drivers/pcmcia/Kconfig"
994 tristate "RapidIO support"
995 depends on HAS_RAPIDIO || PCI
997 If you say Y here, the kernel will include drivers and
998 infrastructure code to support RapidIO interconnect devices.
1001 bool "Freescale Embedded SRIO Controller support"
1002 depends on RAPIDIO = y && HAS_RAPIDIO
1005 Include support for RapidIO controller on Freescale embedded
1006 processors (MPC8548, MPC8641, etc).
1008 source "drivers/rapidio/Kconfig"
1012 config NONSTATIC_KERNEL
1016 menu "Advanced setup"
1019 config ADVANCED_OPTIONS
1020 bool "Prompt for advanced kernel configuration options"
1022 This option will enable prompting for a variety of advanced kernel
1023 configuration options. These options can cause the kernel to not
1024 work if they are set incorrectly, but can be used to optimize certain
1025 aspects of kernel memory management.
1027 Unless you know what you are doing, say N here.
1029 comment "Default settings for advanced configuration options are used"
1030 depends on !ADVANCED_OPTIONS
1032 config LOWMEM_SIZE_BOOL
1033 bool "Set maximum low memory"
1034 depends on ADVANCED_OPTIONS
1036 This option allows you to set the maximum amount of memory which
1037 will be used as "low memory", that is, memory which the kernel can
1038 access directly, without having to set up a kernel virtual mapping.
1039 This can be useful in optimizing the layout of kernel virtual
1042 Say N here unless you know what you are doing.
1045 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1046 default "0x30000000"
1048 config LOWMEM_CAM_NUM_BOOL
1049 bool "Set number of CAMs to use to map low memory"
1050 depends on ADVANCED_OPTIONS && FSL_BOOKE
1052 This option allows you to set the maximum number of CAM slots that
1053 will be used to map low memory. There are a limited number of slots
1054 available and even more limited number that will fit in the L1 MMU.
1055 However, using more entries will allow mapping more low memory. This
1056 can be useful in optimizing the layout of kernel virtual memory.
1058 Say N here unless you know what you are doing.
1060 config LOWMEM_CAM_NUM
1061 depends on FSL_BOOKE
1062 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1065 config DYNAMIC_MEMSTART
1066 bool "Enable page aligned dynamic load address for kernel"
1067 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1068 select NONSTATIC_KERNEL
1070 This option enables the kernel to be loaded at any page aligned
1071 physical address. The kernel creates a mapping from KERNELBASE to
1072 the address where the kernel is loaded. The page size here implies
1073 the TLB page size of the mapping for kernel on the particular platform.
1074 Please refer to the init code for finding the TLB page size.
1076 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1077 kernel image, where the only restriction is the page aligned kernel
1078 load address. When this option is enabled, the compile time physical
1079 address CONFIG_PHYSICAL_START is ignored.
1081 This option is overridden by CONFIG_RELOCATABLE
1083 config PAGE_OFFSET_BOOL
1084 bool "Set custom page offset address"
1085 depends on ADVANCED_OPTIONS
1087 This option allows you to set the kernel virtual address at which
1088 the kernel will map low memory. This can be useful in optimizing
1089 the virtual memory layout of the system.
1091 Say N here unless you know what you are doing.
1094 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1095 default "0xc0000000"
1097 config KERNEL_START_BOOL
1098 bool "Set custom kernel base address"
1099 depends on ADVANCED_OPTIONS
1101 This option allows you to set the kernel virtual address at which
1102 the kernel will be loaded. Normally this should match PAGE_OFFSET
1103 however there are times (like kdump) that one might not want them
1106 Say N here unless you know what you are doing.
1109 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1110 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1111 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1112 default "0xc0000000"
1114 config PHYSICAL_START_BOOL
1115 bool "Set physical address where the kernel is loaded"
1116 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1118 This gives the physical address where the kernel is loaded.
1120 Say N here unless you know what you are doing.
1122 config PHYSICAL_START
1123 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1124 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1125 default "0x00000000"
1127 config PHYSICAL_ALIGN
1129 default "0x04000000" if FSL_BOOKE
1131 This value puts the alignment restrictions on physical address
1132 where kernel is loaded and run from. Kernel is compiled for an
1133 address which meets above alignment restriction.
1135 config TASK_SIZE_BOOL
1136 bool "Set custom user task size"
1137 depends on ADVANCED_OPTIONS
1139 This option allows you to set the amount of virtual address space
1140 allocated to user tasks. This can be useful in optimizing the
1141 virtual memory layout of the system.
1143 Say N here unless you know what you are doing.
1146 hex "Size of user task space" if TASK_SIZE_BOOL
1147 default "0x80000000" if PPC_8xx
1148 default "0xc0000000"
1150 config CONSISTENT_SIZE_BOOL
1151 bool "Set custom consistent memory pool size"
1152 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1154 This option allows you to set the size of the
1155 consistent memory pool. This pool of virtual memory
1156 is used to make consistent memory allocations.
1158 config CONSISTENT_SIZE
1159 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1160 default "0x00200000" if NOT_COHERENT_CACHE
1163 bool "Pinned Kernel TLBs (860 ONLY)"
1164 depends on ADVANCED_OPTIONS && 8xx
1167 bool "Pinned TLB for IMMR"
1173 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1176 default "0xc000000000000000"
1179 default "0xc000000000000000"
1180 config PHYSICAL_START
1182 default "0x00000000"
1188 source "net/Kconfig"
1190 source "drivers/Kconfig"
1194 source "lib/Kconfig"
1196 source "arch/powerpc/Kconfig.debug"
1198 source "security/Kconfig"
1202 depends on COMPAT && KEYS
1205 source "crypto/Kconfig"
1207 config PPC_LIB_RHEAP
1210 source "arch/powerpc/kvm/Kconfig"
1212 source "kernel/livepatch/Kconfig"
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