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 || HARDLOCKUP_DETECTOR)
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 GENERIC_HWEIGHT
116 config ARCH_HAS_DMA_SET_COHERENT_MASK
123 # Please keep this list sorted alphabetically.
125 select ARCH_HAS_DEVMEM_IS_ALLOWED
126 select ARCH_HAS_DMA_SET_COHERENT_MASK
127 select ARCH_HAS_ELF_RANDOMIZE
128 select ARCH_HAS_GCOV_PROFILE_ALL
129 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
130 select ARCH_HAS_SG_CHAIN
131 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
132 select ARCH_HAS_UBSAN_SANITIZE_ALL
133 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
134 select ARCH_HAVE_NMI_SAFE_CMPXCHG
135 select ARCH_MIGHT_HAVE_PC_PARPORT
136 select ARCH_MIGHT_HAVE_PC_SERIO
137 select ARCH_SUPPORTS_ATOMIC_RMW
138 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
139 select ARCH_USE_BUILTIN_BSWAP
140 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
141 select ARCH_WANT_IPC_PARSE_VERSION
142 select ARCH_WEAK_RELEASE_ACQUIRE
144 select BUILDTIME_EXTABLE_SORT
145 select CLONE_BACKWARDS
146 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
147 select EDAC_ATOMIC_SCRUB
149 select GENERIC_ATOMIC64 if PPC32
150 select GENERIC_CLOCKEVENTS
151 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
152 select GENERIC_CMOS_UPDATE
153 select GENERIC_CPU_AUTOPROBE
154 select GENERIC_IRQ_SHOW
155 select GENERIC_IRQ_SHOW_LEVEL
156 select GENERIC_SMP_IDLE_THREAD
157 select GENERIC_STRNCPY_FROM_USER
158 select GENERIC_STRNLEN_USER
159 select GENERIC_TIME_VSYSCALL
160 select HAVE_ARCH_AUDITSYSCALL
161 select HAVE_ARCH_JUMP_LABEL
162 select HAVE_ARCH_KGDB
163 select HAVE_ARCH_MMAP_RND_BITS
164 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
165 select HAVE_ARCH_SECCOMP_FILTER
166 select HAVE_ARCH_TRACEHOOK
167 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S_64 && !RELOCATABLE && !HIBERNATION)
168 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
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_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 || (PPC64 && PPC_BOOK3S)
196 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
198 select HAVE_OPTPROBES if PPC64
199 select HAVE_PERF_EVENTS
200 select HAVE_PERF_EVENTS_NMI if PPC64
201 select HAVE_HARDLOCKUP_DETECTOR_PERF if HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
202 select HAVE_PERF_REGS
203 select HAVE_PERF_USER_STACK_DUMP
204 select HAVE_RCU_TABLE_FREE if SMP
205 select HAVE_REGS_AND_STACK_ACCESS_API
206 select HAVE_SYSCALL_TRACEPOINTS
207 select HAVE_VIRT_CPU_ACCOUNTING
208 select HAVE_IRQ_TIME_ACCOUNTING
210 select IRQ_FORCED_THREADING
211 select MODULES_USE_ELF_RELA
214 select OF_EARLY_FLATTREE
215 select OF_RESERVED_MEM
216 select OLD_SIGACTION if PPC32
217 select OLD_SIGSUSPEND
219 select SYSCTL_EXCEPTION_TRACE
220 select VIRT_TO_BUS if !PPC64
222 # Please keep this list sorted alphabetically.
239 select COMPAT_BINFMT_ELF
240 select ARCH_WANT_OLD_COMPAT_IPC
241 select COMPAT_OLD_SIGACTION
243 config SYSVIPC_COMPAT
245 depends on COMPAT && SYSVIPC
248 # All PPC32s use generic nvram driver through ppc_md
253 config SCHED_OMIT_FRAME_POINTER
257 config ARCH_MAY_HAVE_PC_FDC
261 config PPC_UDBG_16550
265 config GENERIC_TBSYNC
267 default y if PPC32 && SMP
279 config SYS_SUPPORTS_APM_EMULATION
280 default y if PMAC_APM_EMU
286 Used to allow a board to specify it wants an ePAPR compliant wrapper.
289 config DEFAULT_UIMAGE
292 Used to allow a board to specify it wants a uImage built by default
295 config ARCH_HIBERNATION_POSSIBLE
299 config ARCH_SUSPEND_POSSIBLE
301 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
302 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
305 config PPC_DCR_NATIVE
315 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
318 config PPC_OF_PLATFORM_PCI
321 depends on PPC64 # not supported on 32 bits yet
324 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
325 depends on PPC32 || PPC_STD_MMU_64
328 config ARCH_SUPPORTS_UPROBES
331 config PPC_ADV_DEBUG_REGS
333 depends on 40x || BOOKE
336 config PPC_ADV_DEBUG_IACS
338 depends on PPC_ADV_DEBUG_REGS
342 config PPC_ADV_DEBUG_DACS
344 depends on PPC_ADV_DEBUG_REGS
347 config PPC_ADV_DEBUG_DVCS
349 depends on PPC_ADV_DEBUG_REGS
353 config PPC_ADV_DEBUG_DAC_RANGE
355 depends on PPC_ADV_DEBUG_REGS && 44x
358 config PPC_EMULATE_SSTEP
360 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
366 config PGTABLE_LEVELS
369 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
372 source "init/Kconfig"
374 source "kernel/Kconfig.freezer"
376 source "arch/powerpc/sysdev/Kconfig"
377 source "arch/powerpc/platforms/Kconfig"
379 menu "Kernel options"
382 bool "High memory support"
385 source kernel/Kconfig.hz
386 source kernel/Kconfig.preempt
387 source "fs/Kconfig.binfmt"
389 config HUGETLB_PAGE_SIZE_VARIABLE
391 depends on HUGETLB_PAGE
394 config MATH_EMULATION
395 bool "Math emulation"
396 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
398 Some PowerPC chips designed for embedded applications do not have
399 a floating-point unit and therefore do not implement the
400 floating-point instructions in the PowerPC instruction set. If you
401 say Y here, the kernel will include code to emulate a floating-point
402 unit, which will allow programs that use floating-point
405 This is also useful to emulate missing (optional) instructions
406 such as fsqrt on cores that do have an FPU but do not implement
407 them (such as Freescale BookE).
410 prompt "Math emulation options"
411 default MATH_EMULATION_FULL
412 depends on MATH_EMULATION
414 config MATH_EMULATION_FULL
415 bool "Emulate all the floating point instructions"
417 Select this option will enable the kernel to support to emulate
418 all the floating point instructions. If your SoC doesn't have
419 a FPU, you should select this.
421 config MATH_EMULATION_HW_UNIMPLEMENTED
422 bool "Just emulate the FPU unimplemented instructions"
424 Select this if you know there does have a hardware FPU on your
425 SoC, but some floating point instructions are not implemented by that.
429 config PPC_TRANSACTIONAL_MEM
430 bool "Transactional Memory support for POWERPC"
431 depends on PPC_BOOK3S_64
437 Support user-mode Transactional Memory on POWERPC.
439 config LD_HEAD_STUB_CATCH
440 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
444 Very large kernels can cause linker branch stubs to be generated by
445 code in head_64.S, which moves the head text sections out of their
446 specified location. This option can work around the problem.
450 config DISABLE_MPROFILE_KERNEL
451 bool "Disable use of mprofile-kernel for kernel tracing"
452 depends on PPC64 && CPU_LITTLE_ENDIAN
455 Selecting this options disables use of the mprofile-kernel ABI for
456 kernel tracing. That will cause options such as live patching
457 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
460 If you have a toolchain which supports mprofile-kernel, then you can
461 disable this. Otherwise leave it enabled. If you're not sure, say
464 config MPROFILE_KERNEL
465 depends on PPC64 && CPU_LITTLE_ENDIAN
466 def_bool !DISABLE_MPROFILE_KERNEL
472 bool "SWIOTLB support"
476 Support for IO bounce buffering for systems without an IOMMU.
477 This allows us to DMA to the full physical address space on
478 platforms where the size of a physical address is larger
479 than the bus address. Not all platforms support this.
482 bool "Support for enabling/disabling CPUs"
483 depends on SMP && (PPC_PSERIES || \
484 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
486 Say Y here to be able to disable and re-enable individual
487 CPUs at runtime on SMP machines.
489 Say N if you are unsure.
491 config ARCH_CPU_PROBE_RELEASE
493 depends on HOTPLUG_CPU
495 config ARCH_ENABLE_MEMORY_HOTPLUG
498 config ARCH_HAS_WALK_MEMORY
501 config ARCH_ENABLE_MEMORY_HOTREMOVE
504 config PPC64_SUPPORTS_MEMORY_FAILURE
505 bool "Add support for memory hwpoison"
506 depends on PPC_BOOK3S_64
507 default "y" if PPC_POWERNV
508 select ARCH_SUPPORTS_MEMORY_FAILURE
511 bool "kexec system call"
512 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
515 kexec is a system call that implements the ability to shutdown your
516 current kernel, and to start another kernel. It is like a reboot
517 but it is independent of the system firmware. And like a reboot
518 you can start any kernel with it, not just Linux.
520 The name comes from the similarity to the exec system call.
522 It is an ongoing process to be certain the hardware in a machine
523 is properly shutdown, so do not be surprised if this code does not
524 initially work for you. As of this writing the exact hardware
525 interface is strongly in flux, so no good recommendation can be
529 bool "kexec file based system call"
531 select HAVE_IMA_KEXEC
535 depends on CRYPTO_SHA256=y
537 This is a new version of the kexec system call. This call is
538 file based and takes in file descriptors as system call arguments
539 for kernel and initramfs as opposed to a list of segments as is the
540 case for the older kexec call.
543 bool "Build a relocatable kernel"
544 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
545 select NONSTATIC_KERNEL
546 select MODULE_REL_CRCS if MODVERSIONS
548 This builds a kernel image that is capable of running at the
549 location the kernel is loaded at. For ppc32, there is no any
550 alignment restrictions, and this feature is a superset of
551 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
552 16k-aligned base address. The kernel is linked as a
553 position-independent executable (PIE) and contains dynamic relocations
554 which are processed early in the bootup process.
556 One use is for the kexec on panic case where the recovery kernel
557 must live at a different physical address than the primary
560 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
561 it has been loaded at and the compile time physical addresses
562 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
563 setting can still be useful to bootwrappers that need to know the
564 load address of the kernel (eg. u-boot/mkimage).
566 config RELOCATABLE_TEST
567 bool "Test relocatable kernel"
568 depends on (PPC64 && RELOCATABLE)
571 This runs the relocatable kernel at the address it was initially
572 loaded at, which tends to be non-zero and therefore test the
576 bool "Build a dump capture kernel"
577 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
578 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
580 Build a kernel suitable for use as a dump capture kernel.
581 The same kernel binary can be used as production kernel and dump
585 bool "Firmware-assisted dump"
586 depends on PPC64 && PPC_RTAS
590 A robust mechanism to get reliable kernel crash dump with
591 assistance from firmware. This approach does not use kexec,
592 instead firmware assists in booting the capture kernel
593 while preserving memory contents. Firmware-assisted dump
594 is meant to be a kdump replacement offering robustness and
595 speed not possible without system firmware assistance.
600 bool "Distribute interrupts on all CPUs by default"
603 This option gives the kernel permission to distribute IRQs across
604 multiple CPUs. Saying N here will route all IRQs to the first
605 CPU. Generally saying Y is safe, although some problems have been
606 reported with SMP Power Macintoshes with this option enabled.
611 default y if SMP && PPC_PSERIES
617 depends on NEED_MULTIPLE_NODES
619 config USE_PERCPU_NUMA_NODE_ID
623 config HAVE_MEMORYLESS_NODES
627 config ARCH_SELECT_MEMORY_MODEL
631 config ARCH_FLATMEM_ENABLE
633 depends on (PPC64 && !NUMA) || PPC32
635 config ARCH_SPARSEMEM_ENABLE
638 select SPARSEMEM_VMEMMAP_ENABLE
640 config ARCH_SPARSEMEM_DEFAULT
642 depends on PPC_BOOK3S_64
644 config SYS_SUPPORTS_HUGETLBFS
647 config ILLEGAL_POINTER_VALUE
649 # This is roughly half way between the top of user space and the bottom
650 # of kernel space, which seems about as good as we can get.
651 default 0x5deadbeef0000000 if PPC64
656 config ARCH_MEMORY_PROBE
658 depends on MEMORY_HOTPLUG
660 # Some NUMA nodes have memory ranges that span
661 # other nodes. Even though a pfn is valid and
662 # between a node's start and end pfns, it may not
663 # reside on that node. See memmap_init_zone()
665 config NODES_SPAN_OTHER_NODES
667 depends on NEED_MULTIPLE_NODES
670 bool "Using standard binutils settings"
674 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
675 Note, that kernel will be able to run only those applications,
676 which had been compiled using binutils later than 2.17.50.0.3 with
677 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
678 the older binutils, you can patch them with a trivial patch, which
679 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
685 Select the kernel logical page size. Increasing the page size
686 will reduce software overhead at each page boundary, allow
687 hardware prefetch mechanisms to be more effective, and allow
688 larger dma transfers increasing IO efficiency and reducing
689 overhead. However the utilization of memory will increase.
690 For example, each cached file will using a multiple of the
691 page size to hold its contents and the difference between the
692 end of file and the end of page is wasted.
694 Some dedicated systems, such as software raid serving with
695 accelerated calculations, have shown significant increases.
697 If you configure a 64 bit kernel for 64k pages but the
698 processor does not support them, then the kernel will simulate
699 them with 4k pages, loading them on demand, but with the
700 reduced software overhead and larger internal fragmentation.
701 For the 32 bit kernel, a large page option will not be offered
702 unless it is supported by the configured processor.
704 If unsure, choose 4K_PAGES.
708 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
712 depends on 44x || PPC_8xx
716 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
717 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
719 config PPC_256K_PAGES
720 bool "256k page size"
721 depends on 44x && !STDBINUTILS
723 Make the page size 256k.
725 As the ELF standard only requires alignment to support page
726 sizes up to 64k, you will need to compile all of your user
727 space applications with a non-standard binutils settings
728 (see the STDBINUTILS description for details).
730 Say N unless you know what you are doing.
735 int "Thread shift" if EXPERT
737 default "15" if PPC_256K_PAGES
738 default "14" if PPC64
741 Used to define the stack size. The default is almost always what you
742 want. Only change this if you know what you are doing.
744 config FORCE_MAX_ZONEORDER
745 int "Maximum zone order"
746 range 8 9 if PPC64 && PPC_64K_PAGES
747 default "9" if PPC64 && PPC_64K_PAGES
748 range 13 13 if PPC64 && !PPC_64K_PAGES
749 default "13" if PPC64 && !PPC_64K_PAGES
750 range 9 64 if PPC32 && PPC_16K_PAGES
751 default "9" if PPC32 && PPC_16K_PAGES
752 range 7 64 if PPC32 && PPC_64K_PAGES
753 default "7" if PPC32 && PPC_64K_PAGES
754 range 5 64 if PPC32 && PPC_256K_PAGES
755 default "5" if PPC32 && PPC_256K_PAGES
759 The kernel memory allocator divides physically contiguous memory
760 blocks into "zones", where each zone is a power of two number of
761 pages. This option selects the largest power of two that the kernel
762 keeps in the memory allocator. If you need to allocate very large
763 blocks of physically contiguous memory, then you may need to
766 This config option is actually maximum order plus one. For example,
767 a value of 11 means that the largest free memory block is 2^10 pages.
769 The page size is not necessarily 4KB. For example, on 64-bit
770 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
771 this in mind when choosing a value for this option.
773 config PPC_SUBPAGE_PROT
774 bool "Support setting protections for 4k subpages"
775 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
777 This option adds support for a system call to allow user programs
778 to set access permissions (read/write, readonly, or no access)
779 on the 4k subpages of each 64k page.
781 config PPC_COPRO_BASE
786 bool "SMT (Hyperthreading) scheduler support"
787 depends on PPC64 && SMP
789 SMT scheduler support improves the CPU scheduler's decision making
790 when dealing with POWER5 cpus at a cost of slightly increased
791 overhead in some places. If unsure say N here.
793 config PPC_DENORMALISATION
794 bool "PowerPC denormalisation exception handling"
795 depends on PPC_BOOK3S_64
796 default "y" if PPC_POWERNV
798 Add support for handling denormalisation of single precision
799 values. Useful for bare metal only. If unsure say Y here.
802 bool "Default bootloader kernel arguments"
805 string "Initial kernel command string"
806 depends on CMDLINE_BOOL
807 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
809 On some platforms, there is currently no way for the boot loader to
810 pass arguments to the kernel. For these platforms, you can supply
811 some command-line options at build time by entering them here. In
812 most cases you will need to specify the root device here.
815 bool "Always use the default kernel command string"
816 depends on CMDLINE_BOOL
818 Always use the default kernel command string, even if the boot
819 loader passes other arguments to the kernel.
820 This is useful if you cannot or don't want to change the
821 command-line options your boot loader passes to the kernel.
824 string "Additional default image types"
826 List additional targets to be built by the bootwrapper here (separated
827 by spaces). This is useful for targets that depend of device tree
828 files in the .dts directory.
830 Targets in this list will be build as part of the default build
831 target, or when the user does a 'make zImage' or a
832 'make zImage.initrd'.
834 If unsure, leave blank
836 config ARCH_WANTS_FREEZER_CONTROL
840 source kernel/power/Kconfig
843 bool "Enable seccomp to safely compute untrusted bytecode"
847 This kernel feature is useful for number crunching applications
848 that may need to compute untrusted bytecode during their
849 execution. By using pipes or other transports made available to
850 the process as file descriptors supporting the read/write
851 syscalls, it's possible to isolate those applications in
852 their own address space using seccomp. Once seccomp is
853 enabled via /proc/<pid>/seccomp, it cannot be disabled
854 and the task is only allowed to execute a few safe syscalls
855 defined by each seccomp mode.
857 If unsure, say Y. Only embedded should say N here.
868 bool "Support for ISA-bus hardware"
872 Find out whether you have ISA slots on your motherboard. ISA is the
873 name of a bus system, i.e. the way the CPU talks to the other stuff
874 inside your box. If you have an Apple machine, say N here; if you
875 have an IBM RS/6000 or pSeries machine, say Y. If you have an
876 embedded board, consult your board documentation.
882 config NEED_DMA_MAP_STATE
883 def_bool (PPC64 || NOT_COHERENT_CACHE)
885 config NEED_SG_DMA_LENGTH
888 config GENERIC_ISA_DMA
890 depends on ISA_DMA_API
893 config PPC_INDIRECT_PCI
896 default y if 40x || 44x
910 select PPC_INDIRECT_PCI
916 depends on SUSPEND && (PPC_85xx || PPC_86xx)
918 Freescale MPC85xx/MPC86xx power management controller support
919 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
924 depends on SUSPEND && (44x || 40x)
926 PPC4xx Clock Power Management (CPM) support (suspend/resume).
927 It also enables support for two different idle states (idle-wait
934 bool "Freescale Local Bus support"
936 Enables reporting of errors from the Freescale local bus
937 controller. Also contains some common code used by
938 drivers for specific local bus peripherals.
942 depends on PPC_83xx || QUICC_ENGINE || CPM2
944 Freescale General-purpose Timers support
946 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
950 # Platforms that what PCI turned unconditionally just do select PCI
951 # in their config node. Platforms that want to choose at config
952 # time should select PPC_PCI_CHOICE
953 config PPC_PCI_CHOICE
957 bool "PCI support" if PPC_PCI_CHOICE
958 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
959 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
960 default PCI_QSPAN if !4xx && !CPM2 && 8xx
961 select GENERIC_PCI_IOMAP
963 Find out whether your system includes a PCI bus. PCI is the name of
964 a bus system, i.e. the way the CPU talks to the other stuff inside
965 your box. If you say Y here, the kernel will include drivers and
966 infrastructure code to support PCI bus devices.
976 depends on !4xx && !CPM2 && 8xx
979 Say Y here if you have a system based on a Motorola 8xx-series
980 embedded processor with a QSPAN PCI interface, otherwise say N.
984 depends on PCI && 8260
985 select PPC_INDIRECT_PCI
988 source "drivers/pci/Kconfig"
990 source "drivers/pcmcia/Kconfig"
997 tristate "RapidIO support"
998 depends on HAS_RAPIDIO || PCI
1000 If you say Y here, the kernel will include drivers and
1001 infrastructure code to support RapidIO interconnect devices.
1004 bool "Freescale Embedded SRIO Controller support"
1005 depends on RAPIDIO = y && HAS_RAPIDIO
1008 Include support for RapidIO controller on Freescale embedded
1009 processors (MPC8548, MPC8641, etc).
1011 source "drivers/rapidio/Kconfig"
1015 config NONSTATIC_KERNEL
1019 menu "Advanced setup"
1022 config ADVANCED_OPTIONS
1023 bool "Prompt for advanced kernel configuration options"
1025 This option will enable prompting for a variety of advanced kernel
1026 configuration options. These options can cause the kernel to not
1027 work if they are set incorrectly, but can be used to optimize certain
1028 aspects of kernel memory management.
1030 Unless you know what you are doing, say N here.
1032 comment "Default settings for advanced configuration options are used"
1033 depends on !ADVANCED_OPTIONS
1035 config LOWMEM_SIZE_BOOL
1036 bool "Set maximum low memory"
1037 depends on ADVANCED_OPTIONS
1039 This option allows you to set the maximum amount of memory which
1040 will be used as "low memory", that is, memory which the kernel can
1041 access directly, without having to set up a kernel virtual mapping.
1042 This can be useful in optimizing the layout of kernel virtual
1045 Say N here unless you know what you are doing.
1048 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1049 default "0x30000000"
1051 config LOWMEM_CAM_NUM_BOOL
1052 bool "Set number of CAMs to use to map low memory"
1053 depends on ADVANCED_OPTIONS && FSL_BOOKE
1055 This option allows you to set the maximum number of CAM slots that
1056 will be used to map low memory. There are a limited number of slots
1057 available and even more limited number that will fit in the L1 MMU.
1058 However, using more entries will allow mapping more low memory. This
1059 can be useful in optimizing the layout of kernel virtual memory.
1061 Say N here unless you know what you are doing.
1063 config LOWMEM_CAM_NUM
1064 depends on FSL_BOOKE
1065 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1068 config DYNAMIC_MEMSTART
1069 bool "Enable page aligned dynamic load address for kernel"
1070 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1071 select NONSTATIC_KERNEL
1073 This option enables the kernel to be loaded at any page aligned
1074 physical address. The kernel creates a mapping from KERNELBASE to
1075 the address where the kernel is loaded. The page size here implies
1076 the TLB page size of the mapping for kernel on the particular platform.
1077 Please refer to the init code for finding the TLB page size.
1079 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1080 kernel image, where the only restriction is the page aligned kernel
1081 load address. When this option is enabled, the compile time physical
1082 address CONFIG_PHYSICAL_START is ignored.
1084 This option is overridden by CONFIG_RELOCATABLE
1086 config PAGE_OFFSET_BOOL
1087 bool "Set custom page offset address"
1088 depends on ADVANCED_OPTIONS
1090 This option allows you to set the kernel virtual address at which
1091 the kernel will map low memory. This can be useful in optimizing
1092 the virtual memory layout of the system.
1094 Say N here unless you know what you are doing.
1097 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1098 default "0xc0000000"
1100 config KERNEL_START_BOOL
1101 bool "Set custom kernel base address"
1102 depends on ADVANCED_OPTIONS
1104 This option allows you to set the kernel virtual address at which
1105 the kernel will be loaded. Normally this should match PAGE_OFFSET
1106 however there are times (like kdump) that one might not want them
1109 Say N here unless you know what you are doing.
1112 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1113 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1114 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1115 default "0xc0000000"
1117 config PHYSICAL_START_BOOL
1118 bool "Set physical address where the kernel is loaded"
1119 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1121 This gives the physical address where the kernel is loaded.
1123 Say N here unless you know what you are doing.
1125 config PHYSICAL_START
1126 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1127 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1128 default "0x00000000"
1130 config PHYSICAL_ALIGN
1132 default "0x04000000" if FSL_BOOKE
1134 This value puts the alignment restrictions on physical address
1135 where kernel is loaded and run from. Kernel is compiled for an
1136 address which meets above alignment restriction.
1138 config TASK_SIZE_BOOL
1139 bool "Set custom user task size"
1140 depends on ADVANCED_OPTIONS
1142 This option allows you to set the amount of virtual address space
1143 allocated to user tasks. This can be useful in optimizing the
1144 virtual memory layout of the system.
1146 Say N here unless you know what you are doing.
1149 hex "Size of user task space" if TASK_SIZE_BOOL
1150 default "0x80000000" if PPC_8xx
1151 default "0xc0000000"
1153 config CONSISTENT_SIZE_BOOL
1154 bool "Set custom consistent memory pool size"
1155 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1157 This option allows you to set the size of the
1158 consistent memory pool. This pool of virtual memory
1159 is used to make consistent memory allocations.
1161 config CONSISTENT_SIZE
1162 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1163 default "0x00200000" if NOT_COHERENT_CACHE
1166 bool "Pinned Kernel TLBs (860 ONLY)"
1167 depends on ADVANCED_OPTIONS && 8xx
1170 bool "Pinned TLB for IMMR"
1176 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1179 default "0xc000000000000000"
1182 default "0xc000000000000000"
1183 config PHYSICAL_START
1185 default "0x00000000"
1191 source "net/Kconfig"
1193 source "drivers/Kconfig"
1197 source "lib/Kconfig"
1199 source "arch/powerpc/Kconfig.debug"
1201 source "security/Kconfig"
1203 source "crypto/Kconfig"
1205 config PPC_LIB_RHEAP
1208 source "arch/powerpc/kvm/Kconfig"
1210 source "kernel/livepatch/Kconfig"