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.
83 config STACKTRACE_SUPPORT
87 config TRACE_IRQFLAGS_SUPPORT
91 config LOCKDEP_SUPPORT
95 config RWSEM_GENERIC_SPINLOCK
98 config RWSEM_XCHGADD_ALGORITHM
102 config GENERIC_LOCKBREAK
105 depends on SMP && PREEMPT
107 config ARCH_HAS_ILOG2_U32
111 config ARCH_HAS_ILOG2_U64
115 config GENERIC_HWEIGHT
119 config ARCH_HAS_DMA_SET_COHERENT_MASK
126 # Please keep this list sorted alphabetically.
128 select ARCH_HAS_DEVMEM_IS_ALLOWED
129 select ARCH_HAS_DMA_SET_COHERENT_MASK
130 select ARCH_HAS_ELF_RANDOMIZE
131 select ARCH_HAS_GCOV_PROFILE_ALL
132 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
133 select ARCH_HAS_SG_CHAIN
134 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
135 select ARCH_HAS_UBSAN_SANITIZE_ALL
136 select ARCH_HAVE_NMI_SAFE_CMPXCHG
137 select ARCH_MIGHT_HAVE_PC_PARPORT
138 select ARCH_MIGHT_HAVE_PC_SERIO
139 select ARCH_SUPPORTS_ATOMIC_RMW
140 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
141 select ARCH_USE_BUILTIN_BSWAP
142 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
143 select ARCH_WANT_IPC_PARSE_VERSION
145 select BUILDTIME_EXTABLE_SORT
146 select CLONE_BACKWARDS
147 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
148 select EDAC_ATOMIC_SCRUB
150 select GENERIC_ATOMIC64 if PPC32
151 select GENERIC_CLOCKEVENTS
152 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
153 select GENERIC_CMOS_UPDATE
154 select GENERIC_CPU_AUTOPROBE
155 select GENERIC_IRQ_SHOW
156 select GENERIC_IRQ_SHOW_LEVEL
157 select GENERIC_SMP_IDLE_THREAD
158 select GENERIC_STRNCPY_FROM_USER
159 select GENERIC_STRNLEN_USER
160 select GENERIC_TIME_VSYSCALL_OLD
161 select HAVE_ARCH_AUDITSYSCALL
162 select HAVE_ARCH_HARDENED_USERCOPY
163 select HAVE_ARCH_JUMP_LABEL
164 select HAVE_ARCH_KGDB
165 select HAVE_ARCH_MMAP_RND_BITS
166 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
167 select HAVE_ARCH_SECCOMP_FILTER
168 select HAVE_ARCH_TRACEHOOK
169 select HAVE_CBPF_JIT if !PPC64
170 select HAVE_CONTEXT_TRACKING if PPC64
171 select HAVE_DEBUG_KMEMLEAK
172 select HAVE_DEBUG_STACKOVERFLOW
173 select HAVE_DMA_API_DEBUG
174 select HAVE_DYNAMIC_FTRACE
175 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
176 select HAVE_EBPF_JIT if PPC64
177 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
178 select HAVE_FTRACE_MCOUNT_RECORD
179 select HAVE_FUNCTION_GRAPH_TRACER
180 select HAVE_FUNCTION_TRACER
181 select HAVE_GCC_PLUGINS
182 select HAVE_GENERIC_RCU_GUP
183 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
185 select HAVE_IOREMAP_PROT
186 select HAVE_IRQ_EXIT_ON_IRQ_STACK
187 select HAVE_KERNEL_GZIP
189 select HAVE_KPROBES_ON_FTRACE
190 select HAVE_KRETPROBES
191 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
193 select HAVE_MEMBLOCK_NODE_MAP
194 select HAVE_MOD_ARCH_SPECIFIC
195 select HAVE_NMI if PERF_EVENTS
197 select HAVE_OPTPROBES if PPC64
198 select HAVE_PERF_EVENTS
199 select HAVE_PERF_EVENTS_NMI if PPC64
200 select HAVE_PERF_REGS
201 select HAVE_PERF_USER_STACK_DUMP
202 select HAVE_RCU_TABLE_FREE if SMP
203 select HAVE_REGS_AND_STACK_ACCESS_API
204 select HAVE_SYSCALL_TRACEPOINTS
205 select HAVE_VIRT_CPU_ACCOUNTING
207 select IRQ_FORCED_THREADING
208 select MODULES_USE_ELF_RELA
211 select OF_EARLY_FLATTREE
212 select OF_RESERVED_MEM
213 select OLD_SIGACTION if PPC32
214 select OLD_SIGSUSPEND
216 select SYSCTL_EXCEPTION_TRACE
217 select VIRT_TO_BUS if !PPC64
219 # Please keep this list sorted alphabetically.
236 select COMPAT_BINFMT_ELF
237 select ARCH_WANT_OLD_COMPAT_IPC
238 select COMPAT_OLD_SIGACTION
240 config SYSVIPC_COMPAT
242 depends on COMPAT && SYSVIPC
245 # All PPC32s use generic nvram driver through ppc_md
250 config SCHED_OMIT_FRAME_POINTER
254 config ARCH_MAY_HAVE_PC_FDC
258 config PPC_UDBG_16550
262 config GENERIC_TBSYNC
264 default y if PPC32 && SMP
276 config SYS_SUPPORTS_APM_EMULATION
277 default y if PMAC_APM_EMU
283 Used to allow a board to specify it wants an ePAPR compliant wrapper.
286 config DEFAULT_UIMAGE
289 Used to allow a board to specify it wants a uImage built by default
292 config ARCH_HIBERNATION_POSSIBLE
296 config ARCH_SUSPEND_POSSIBLE
298 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
299 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
302 config PPC_DCR_NATIVE
312 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
315 config PPC_OF_PLATFORM_PCI
318 depends on PPC64 # not supported on 32 bits yet
321 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
322 depends on PPC32 || PPC_STD_MMU_64
325 config ARCH_SUPPORTS_UPROBES
328 config PPC_ADV_DEBUG_REGS
330 depends on 40x || BOOKE
333 config PPC_ADV_DEBUG_IACS
335 depends on PPC_ADV_DEBUG_REGS
339 config PPC_ADV_DEBUG_DACS
341 depends on PPC_ADV_DEBUG_REGS
344 config PPC_ADV_DEBUG_DVCS
346 depends on PPC_ADV_DEBUG_REGS
350 config PPC_ADV_DEBUG_DAC_RANGE
352 depends on PPC_ADV_DEBUG_REGS && 44x
355 config PPC_EMULATE_SSTEP
357 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
363 config PGTABLE_LEVELS
366 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
369 source "init/Kconfig"
371 source "kernel/Kconfig.freezer"
373 source "arch/powerpc/sysdev/Kconfig"
374 source "arch/powerpc/platforms/Kconfig"
376 menu "Kernel options"
379 bool "High memory support"
382 source kernel/Kconfig.hz
383 source kernel/Kconfig.preempt
384 source "fs/Kconfig.binfmt"
386 config HUGETLB_PAGE_SIZE_VARIABLE
388 depends on HUGETLB_PAGE
391 config MATH_EMULATION
392 bool "Math emulation"
393 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
395 Some PowerPC chips designed for embedded applications do not have
396 a floating-point unit and therefore do not implement the
397 floating-point instructions in the PowerPC instruction set. If you
398 say Y here, the kernel will include code to emulate a floating-point
399 unit, which will allow programs that use floating-point
402 This is also useful to emulate missing (optional) instructions
403 such as fsqrt on cores that do have an FPU but do not implement
404 them (such as Freescale BookE).
407 prompt "Math emulation options"
408 default MATH_EMULATION_FULL
409 depends on MATH_EMULATION
411 config MATH_EMULATION_FULL
412 bool "Emulate all the floating point instructions"
414 Select this option will enable the kernel to support to emulate
415 all the floating point instructions. If your SoC doesn't have
416 a FPU, you should select this.
418 config MATH_EMULATION_HW_UNIMPLEMENTED
419 bool "Just emulate the FPU unimplemented instructions"
421 Select this if you know there does have a hardware FPU on your
422 SoC, but some floating point instructions are not implemented by that.
426 config PPC_TRANSACTIONAL_MEM
427 bool "Transactional Memory support for POWERPC"
428 depends on PPC_BOOK3S_64
434 Support user-mode Transactional Memory on POWERPC.
436 config DISABLE_MPROFILE_KERNEL
437 bool "Disable use of mprofile-kernel for kernel tracing"
438 depends on PPC64 && CPU_LITTLE_ENDIAN
441 Selecting this options disables use of the mprofile-kernel ABI for
442 kernel tracing. That will cause options such as live patching
443 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
446 If you have a toolchain which supports mprofile-kernel, then you can
447 disable this. Otherwise leave it enabled. If you're not sure, say
450 config MPROFILE_KERNEL
451 depends on PPC64 && CPU_LITTLE_ENDIAN
452 def_bool !DISABLE_MPROFILE_KERNEL
454 config USE_THIN_ARCHIVES
455 bool "Build the kernel using thin archives"
459 Build the kernel using thin archives.
460 If you're unsure say N.
466 bool "SWIOTLB support"
470 Support for IO bounce buffering for systems without an IOMMU.
471 This allows us to DMA to the full physical address space on
472 platforms where the size of a physical address is larger
473 than the bus address. Not all platforms support this.
476 bool "Support for enabling/disabling CPUs"
477 depends on SMP && (PPC_PSERIES || \
478 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
480 Say Y here to be able to disable and re-enable individual
481 CPUs at runtime on SMP machines.
483 Say N if you are unsure.
485 config ARCH_CPU_PROBE_RELEASE
487 depends on HOTPLUG_CPU
489 config ARCH_ENABLE_MEMORY_HOTPLUG
492 config ARCH_HAS_WALK_MEMORY
495 config ARCH_ENABLE_MEMORY_HOTREMOVE
498 config PPC64_SUPPORTS_MEMORY_FAILURE
499 bool "Add support for memory hwpoison"
500 depends on PPC_BOOK3S_64
501 default "y" if PPC_POWERNV
502 select ARCH_SUPPORTS_MEMORY_FAILURE
505 bool "kexec system call"
506 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
509 kexec is a system call that implements the ability to shutdown your
510 current kernel, and to start another kernel. It is like a reboot
511 but it is independent of the system firmware. And like a reboot
512 you can start any kernel with it, not just Linux.
514 The name comes from the similarity to the exec system call.
516 It is an ongoing process to be certain the hardware in a machine
517 is properly shutdown, so do not be surprised if this code does not
518 initially work for you. As of this writing the exact hardware
519 interface is strongly in flux, so no good recommendation can be
523 bool "kexec file based system call"
525 select HAVE_IMA_KEXEC
529 depends on CRYPTO_SHA256=y
531 This is a new version of the kexec system call. This call is
532 file based and takes in file descriptors as system call arguments
533 for kernel and initramfs as opposed to a list of segments as is the
534 case for the older kexec call.
537 bool "Build a relocatable kernel"
538 depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
539 select NONSTATIC_KERNEL
540 select MODULE_REL_CRCS if MODVERSIONS
542 This builds a kernel image that is capable of running at the
543 location the kernel is loaded at. For ppc32, there is no any
544 alignment restrictions, and this feature is a superset of
545 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
546 16k-aligned base address. The kernel is linked as a
547 position-independent executable (PIE) and contains dynamic relocations
548 which are processed early in the bootup process.
550 One use is for the kexec on panic case where the recovery kernel
551 must live at a different physical address than the primary
554 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
555 it has been loaded at and the compile time physical addresses
556 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
557 setting can still be useful to bootwrappers that need to know the
558 load address of the kernel (eg. u-boot/mkimage).
560 config RELOCATABLE_TEST
561 bool "Test relocatable kernel"
562 depends on (PPC64 && RELOCATABLE)
565 This runs the relocatable kernel at the address it was initially
566 loaded at, which tends to be non-zero and therefore test the
570 bool "Build a kdump crash kernel"
571 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
572 select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
574 Build a kernel suitable for use as a kdump capture kernel.
575 The same kernel binary can be used as production kernel and dump
579 bool "Firmware-assisted dump"
580 depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC_CORE
582 A robust mechanism to get reliable kernel crash dump with
583 assistance from firmware. This approach does not use kexec,
584 instead firmware assists in booting the kdump kernel
585 while preserving memory contents. Firmware-assisted dump
586 is meant to be a kdump replacement offering robustness and
587 speed not possible without system firmware assistance.
592 bool "Distribute interrupts on all CPUs by default"
595 This option gives the kernel permission to distribute IRQs across
596 multiple CPUs. Saying N here will route all IRQs to the first
597 CPU. Generally saying Y is safe, although some problems have been
598 reported with SMP Power Macintoshes with this option enabled.
603 default y if SMP && PPC_PSERIES
609 depends on NEED_MULTIPLE_NODES
611 config USE_PERCPU_NUMA_NODE_ID
615 config HAVE_MEMORYLESS_NODES
619 config ARCH_SELECT_MEMORY_MODEL
623 config ARCH_FLATMEM_ENABLE
625 depends on (PPC64 && !NUMA) || PPC32
627 config ARCH_SPARSEMEM_ENABLE
630 select SPARSEMEM_VMEMMAP_ENABLE
632 config ARCH_SPARSEMEM_DEFAULT
634 depends on PPC_BOOK3S_64
636 config SYS_SUPPORTS_HUGETLBFS
639 config ILLEGAL_POINTER_VALUE
641 # This is roughly half way between the top of user space and the bottom
642 # of kernel space, which seems about as good as we can get.
643 default 0x5deadbeef0000000 if PPC64
648 config ARCH_MEMORY_PROBE
650 depends on MEMORY_HOTPLUG
652 # Some NUMA nodes have memory ranges that span
653 # other nodes. Even though a pfn is valid and
654 # between a node's start and end pfns, it may not
655 # reside on that node. See memmap_init_zone()
657 config NODES_SPAN_OTHER_NODES
659 depends on NEED_MULTIPLE_NODES
662 bool "Using standard binutils settings"
666 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
667 Note, that kernel will be able to run only those applications,
668 which had been compiled using binutils later than 2.17.50.0.3 with
669 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
670 the older binutils, you can patch them with a trivial patch, which
671 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
677 Select the kernel logical page size. Increasing the page size
678 will reduce software overhead at each page boundary, allow
679 hardware prefetch mechanisms to be more effective, and allow
680 larger dma transfers increasing IO efficiency and reducing
681 overhead. However the utilization of memory will increase.
682 For example, each cached file will using a multiple of the
683 page size to hold its contents and the difference between the
684 end of file and the end of page is wasted.
686 Some dedicated systems, such as software raid serving with
687 accelerated calculations, have shown significant increases.
689 If you configure a 64 bit kernel for 64k pages but the
690 processor does not support them, then the kernel will simulate
691 them with 4k pages, loading them on demand, but with the
692 reduced software overhead and larger internal fragmentation.
693 For the 32 bit kernel, a large page option will not be offered
694 unless it is supported by the configured processor.
696 If unsure, choose 4K_PAGES.
700 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
704 depends on 44x || PPC_8xx
708 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
709 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
711 config PPC_256K_PAGES
712 bool "256k page size"
713 depends on 44x && !STDBINUTILS
715 Make the page size 256k.
717 As the ELF standard only requires alignment to support page
718 sizes up to 64k, you will need to compile all of your user
719 space applications with a non-standard binutils settings
720 (see the STDBINUTILS description for details).
722 Say N unless you know what you are doing.
727 int "Thread shift" if EXPERT
729 default "15" if PPC_256K_PAGES
730 default "14" if PPC64
733 Used to define the stack size. The default is almost always what you
734 want. Only change this if you know what you are doing.
736 config FORCE_MAX_ZONEORDER
737 int "Maximum zone order"
738 range 8 9 if PPC64 && PPC_64K_PAGES
739 default "9" if PPC64 && PPC_64K_PAGES
740 range 13 13 if PPC64 && !PPC_64K_PAGES
741 default "13" if PPC64 && !PPC_64K_PAGES
742 range 9 64 if PPC32 && PPC_16K_PAGES
743 default "9" if PPC32 && PPC_16K_PAGES
744 range 7 64 if PPC32 && PPC_64K_PAGES
745 default "7" if PPC32 && PPC_64K_PAGES
746 range 5 64 if PPC32 && PPC_256K_PAGES
747 default "5" if PPC32 && PPC_256K_PAGES
751 The kernel memory allocator divides physically contiguous memory
752 blocks into "zones", where each zone is a power of two number of
753 pages. This option selects the largest power of two that the kernel
754 keeps in the memory allocator. If you need to allocate very large
755 blocks of physically contiguous memory, then you may need to
758 This config option is actually maximum order plus one. For example,
759 a value of 11 means that the largest free memory block is 2^10 pages.
761 The page size is not necessarily 4KB. For example, on 64-bit
762 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
763 this in mind when choosing a value for this option.
765 config PPC_SUBPAGE_PROT
766 bool "Support setting protections for 4k subpages"
767 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
769 This option adds support for a system call to allow user programs
770 to set access permissions (read/write, readonly, or no access)
771 on the 4k subpages of each 64k page.
773 config PPC_COPRO_BASE
778 bool "SMT (Hyperthreading) scheduler support"
779 depends on PPC64 && SMP
781 SMT scheduler support improves the CPU scheduler's decision making
782 when dealing with POWER5 cpus at a cost of slightly increased
783 overhead in some places. If unsure say N here.
785 config PPC_DENORMALISATION
786 bool "PowerPC denormalisation exception handling"
787 depends on PPC_BOOK3S_64
788 default "y" if PPC_POWERNV
790 Add support for handling denormalisation of single precision
791 values. Useful for bare metal only. If unsure say Y here.
794 bool "Default bootloader kernel arguments"
797 string "Initial kernel command string"
798 depends on CMDLINE_BOOL
799 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
801 On some platforms, there is currently no way for the boot loader to
802 pass arguments to the kernel. For these platforms, you can supply
803 some command-line options at build time by entering them here. In
804 most cases you will need to specify the root device here.
807 bool "Always use the default kernel command string"
808 depends on CMDLINE_BOOL
810 Always use the default kernel command string, even if the boot
811 loader passes other arguments to the kernel.
812 This is useful if you cannot or don't want to change the
813 command-line options your boot loader passes to the kernel.
816 string "Additional default image types"
818 List additional targets to be built by the bootwrapper here (separated
819 by spaces). This is useful for targets that depend of device tree
820 files in the .dts directory.
822 Targets in this list will be build as part of the default build
823 target, or when the user does a 'make zImage' or a
824 'make zImage.initrd'.
826 If unsure, leave blank
828 config ARCH_WANTS_FREEZER_CONTROL
832 source kernel/power/Kconfig
835 bool "Enable seccomp to safely compute untrusted bytecode"
839 This kernel feature is useful for number crunching applications
840 that may need to compute untrusted bytecode during their
841 execution. By using pipes or other transports made available to
842 the process as file descriptors supporting the read/write
843 syscalls, it's possible to isolate those applications in
844 their own address space using seccomp. Once seccomp is
845 enabled via /proc/<pid>/seccomp, it cannot be disabled
846 and the task is only allowed to execute a few safe syscalls
847 defined by each seccomp mode.
849 If unsure, say Y. Only embedded should say N here.
860 bool "Support for ISA-bus hardware"
864 Find out whether you have ISA slots on your motherboard. ISA is the
865 name of a bus system, i.e. the way the CPU talks to the other stuff
866 inside your box. If you have an Apple machine, say N here; if you
867 have an IBM RS/6000 or pSeries machine, say Y. If you have an
868 embedded board, consult your board documentation.
874 config NEED_DMA_MAP_STATE
875 def_bool (PPC64 || NOT_COHERENT_CACHE)
877 config NEED_SG_DMA_LENGTH
880 config GENERIC_ISA_DMA
882 depends on ISA_DMA_API
885 config PPC_INDIRECT_PCI
888 default y if 40x || 44x
902 select PPC_INDIRECT_PCI
908 depends on SUSPEND && (PPC_85xx || PPC_86xx)
910 Freescale MPC85xx/MPC86xx power management controller support
911 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
916 depends on SUSPEND && (44x || 40x)
918 PPC4xx Clock Power Management (CPM) support (suspend/resume).
919 It also enables support for two different idle states (idle-wait
926 bool "Freescale Local Bus support"
928 Enables reporting of errors from the Freescale local bus
929 controller. Also contains some common code used by
930 drivers for specific local bus peripherals.
934 depends on PPC_83xx || QUICC_ENGINE || CPM2
936 Freescale General-purpose Timers support
938 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
942 # Platforms that what PCI turned unconditionally just do select PCI
943 # in their config node. Platforms that want to choose at config
944 # time should select PPC_PCI_CHOICE
945 config PPC_PCI_CHOICE
949 bool "PCI support" if PPC_PCI_CHOICE
950 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
951 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
952 default PCI_QSPAN if !4xx && !CPM2 && 8xx
953 select GENERIC_PCI_IOMAP
955 Find out whether your system includes a PCI bus. PCI is the name of
956 a bus system, i.e. the way the CPU talks to the other stuff inside
957 your box. If you say Y here, the kernel will include drivers and
958 infrastructure code to support PCI bus devices.
968 depends on !4xx && !CPM2 && 8xx
971 Say Y here if you have a system based on a Motorola 8xx-series
972 embedded processor with a QSPAN PCI interface, otherwise say N.
976 depends on PCI && 8260
977 select PPC_INDIRECT_PCI
980 source "drivers/pci/Kconfig"
982 source "drivers/pcmcia/Kconfig"
989 tristate "RapidIO support"
990 depends on HAS_RAPIDIO || PCI
992 If you say Y here, the kernel will include drivers and
993 infrastructure code to support RapidIO interconnect devices.
996 bool "Freescale Embedded SRIO Controller support"
997 depends on RAPIDIO = y && HAS_RAPIDIO
1000 Include support for RapidIO controller on Freescale embedded
1001 processors (MPC8548, MPC8641, etc).
1003 source "drivers/rapidio/Kconfig"
1007 config NONSTATIC_KERNEL
1011 menu "Advanced setup"
1014 config ADVANCED_OPTIONS
1015 bool "Prompt for advanced kernel configuration options"
1017 This option will enable prompting for a variety of advanced kernel
1018 configuration options. These options can cause the kernel to not
1019 work if they are set incorrectly, but can be used to optimize certain
1020 aspects of kernel memory management.
1022 Unless you know what you are doing, say N here.
1024 comment "Default settings for advanced configuration options are used"
1025 depends on !ADVANCED_OPTIONS
1027 config LOWMEM_SIZE_BOOL
1028 bool "Set maximum low memory"
1029 depends on ADVANCED_OPTIONS
1031 This option allows you to set the maximum amount of memory which
1032 will be used as "low memory", that is, memory which the kernel can
1033 access directly, without having to set up a kernel virtual mapping.
1034 This can be useful in optimizing the layout of kernel virtual
1037 Say N here unless you know what you are doing.
1040 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1041 default "0x30000000"
1043 config LOWMEM_CAM_NUM_BOOL
1044 bool "Set number of CAMs to use to map low memory"
1045 depends on ADVANCED_OPTIONS && FSL_BOOKE
1047 This option allows you to set the maximum number of CAM slots that
1048 will be used to map low memory. There are a limited number of slots
1049 available and even more limited number that will fit in the L1 MMU.
1050 However, using more entries will allow mapping more low memory. This
1051 can be useful in optimizing the layout of kernel virtual memory.
1053 Say N here unless you know what you are doing.
1055 config LOWMEM_CAM_NUM
1056 depends on FSL_BOOKE
1057 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1060 config DYNAMIC_MEMSTART
1061 bool "Enable page aligned dynamic load address for kernel"
1062 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1063 select NONSTATIC_KERNEL
1065 This option enables the kernel to be loaded at any page aligned
1066 physical address. The kernel creates a mapping from KERNELBASE to
1067 the address where the kernel is loaded. The page size here implies
1068 the TLB page size of the mapping for kernel on the particular platform.
1069 Please refer to the init code for finding the TLB page size.
1071 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1072 kernel image, where the only restriction is the page aligned kernel
1073 load address. When this option is enabled, the compile time physical
1074 address CONFIG_PHYSICAL_START is ignored.
1076 This option is overridden by CONFIG_RELOCATABLE
1078 config PAGE_OFFSET_BOOL
1079 bool "Set custom page offset address"
1080 depends on ADVANCED_OPTIONS
1082 This option allows you to set the kernel virtual address at which
1083 the kernel will map low memory. This can be useful in optimizing
1084 the virtual memory layout of the system.
1086 Say N here unless you know what you are doing.
1089 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1090 default "0xc0000000"
1092 config KERNEL_START_BOOL
1093 bool "Set custom kernel base address"
1094 depends on ADVANCED_OPTIONS
1096 This option allows you to set the kernel virtual address at which
1097 the kernel will be loaded. Normally this should match PAGE_OFFSET
1098 however there are times (like kdump) that one might not want them
1101 Say N here unless you know what you are doing.
1104 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1105 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1106 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1107 default "0xc0000000"
1109 config PHYSICAL_START_BOOL
1110 bool "Set physical address where the kernel is loaded"
1111 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1113 This gives the physical address where the kernel is loaded.
1115 Say N here unless you know what you are doing.
1117 config PHYSICAL_START
1118 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1119 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1120 default "0x00000000"
1122 config PHYSICAL_ALIGN
1124 default "0x04000000" if FSL_BOOKE
1126 This value puts the alignment restrictions on physical address
1127 where kernel is loaded and run from. Kernel is compiled for an
1128 address which meets above alignment restriction.
1130 config TASK_SIZE_BOOL
1131 bool "Set custom user task size"
1132 depends on ADVANCED_OPTIONS
1134 This option allows you to set the amount of virtual address space
1135 allocated to user tasks. This can be useful in optimizing the
1136 virtual memory layout of the system.
1138 Say N here unless you know what you are doing.
1141 hex "Size of user task space" if TASK_SIZE_BOOL
1142 default "0x80000000" if PPC_8xx
1143 default "0xc0000000"
1145 config CONSISTENT_SIZE_BOOL
1146 bool "Set custom consistent memory pool size"
1147 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1149 This option allows you to set the size of the
1150 consistent memory pool. This pool of virtual memory
1151 is used to make consistent memory allocations.
1153 config CONSISTENT_SIZE
1154 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1155 default "0x00200000" if NOT_COHERENT_CACHE
1158 bool "Pinned Kernel TLBs (860 ONLY)"
1159 depends on ADVANCED_OPTIONS && 8xx
1162 bool "Pinned TLB for IMMR"
1168 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1171 default "0xc000000000000000"
1174 default "0xc000000000000000"
1175 config PHYSICAL_START
1177 default "0x00000000"
1183 source "net/Kconfig"
1185 source "drivers/Kconfig"
1189 source "lib/Kconfig"
1191 source "arch/powerpc/Kconfig.debug"
1193 source "security/Kconfig"
1197 depends on COMPAT && KEYS
1200 source "crypto/Kconfig"
1202 config PPC_LIB_RHEAP
1205 source "arch/powerpc/kvm/Kconfig"
1207 source "kernel/livepatch/Kconfig"