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
149 select ARCH_WEAK_RELEASE_ACQUIRE
151 select BUILDTIME_EXTABLE_SORT
152 select CLONE_BACKWARDS
153 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
154 select EDAC_ATOMIC_SCRUB
156 select GENERIC_ATOMIC64 if PPC32
157 select GENERIC_CLOCKEVENTS
158 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
159 select GENERIC_CMOS_UPDATE
160 select GENERIC_CPU_AUTOPROBE
161 select GENERIC_IRQ_SHOW
162 select GENERIC_IRQ_SHOW_LEVEL
163 select GENERIC_SMP_IDLE_THREAD
164 select GENERIC_STRNCPY_FROM_USER
165 select GENERIC_STRNLEN_USER
166 select GENERIC_TIME_VSYSCALL_OLD
167 select HAVE_ARCH_AUDITSYSCALL
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"
383 config PPC_DT_CPU_FTRS
384 bool "Device-tree based CPU feature discovery & setup"
385 depends on PPC_BOOK3S_64
388 This enables code to use a new device tree binding for describing CPU
389 compatibility and features. Saying Y here will attempt to use the new
390 binding if the firmware provides it. Currently only the skiboot
391 firmware provides this binding.
392 If you're not sure say Y.
394 config PPC_CPUFEATURES_ENABLE_UNKNOWN
395 bool "cpufeatures pass through unknown features to guest/userspace"
396 depends on PPC_DT_CPU_FTRS
400 bool "High memory support"
403 source kernel/Kconfig.hz
404 source kernel/Kconfig.preempt
405 source "fs/Kconfig.binfmt"
407 config HUGETLB_PAGE_SIZE_VARIABLE
409 depends on HUGETLB_PAGE
412 config MATH_EMULATION
413 bool "Math emulation"
414 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
416 Some PowerPC chips designed for embedded applications do not have
417 a floating-point unit and therefore do not implement the
418 floating-point instructions in the PowerPC instruction set. If you
419 say Y here, the kernel will include code to emulate a floating-point
420 unit, which will allow programs that use floating-point
423 This is also useful to emulate missing (optional) instructions
424 such as fsqrt on cores that do have an FPU but do not implement
425 them (such as Freescale BookE).
428 prompt "Math emulation options"
429 default MATH_EMULATION_FULL
430 depends on MATH_EMULATION
432 config MATH_EMULATION_FULL
433 bool "Emulate all the floating point instructions"
435 Select this option will enable the kernel to support to emulate
436 all the floating point instructions. If your SoC doesn't have
437 a FPU, you should select this.
439 config MATH_EMULATION_HW_UNIMPLEMENTED
440 bool "Just emulate the FPU unimplemented instructions"
442 Select this if you know there does have a hardware FPU on your
443 SoC, but some floating point instructions are not implemented by that.
447 config PPC_TRANSACTIONAL_MEM
448 bool "Transactional Memory support for POWERPC"
449 depends on PPC_BOOK3S_64
455 Support user-mode Transactional Memory on POWERPC.
457 config DISABLE_MPROFILE_KERNEL
458 bool "Disable use of mprofile-kernel for kernel tracing"
459 depends on PPC64 && CPU_LITTLE_ENDIAN
462 Selecting this options disables use of the mprofile-kernel ABI for
463 kernel tracing. That will cause options such as live patching
464 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
467 If you have a toolchain which supports mprofile-kernel, then you can
468 disable this. Otherwise leave it enabled. If you're not sure, say
471 config MPROFILE_KERNEL
472 depends on PPC64 && CPU_LITTLE_ENDIAN
473 def_bool !DISABLE_MPROFILE_KERNEL
475 config USE_THIN_ARCHIVES
476 bool "Build the kernel using thin archives"
480 Build the kernel using thin archives.
481 If you're unsure say N.
487 bool "SWIOTLB support"
491 Support for IO bounce buffering for systems without an IOMMU.
492 This allows us to DMA to the full physical address space on
493 platforms where the size of a physical address is larger
494 than the bus address. Not all platforms support this.
497 bool "Support for enabling/disabling CPUs"
498 depends on SMP && (PPC_PSERIES || \
499 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
501 Say Y here to be able to disable and re-enable individual
502 CPUs at runtime on SMP machines.
504 Say N if you are unsure.
506 config ARCH_CPU_PROBE_RELEASE
508 depends on HOTPLUG_CPU
510 config ARCH_ENABLE_MEMORY_HOTPLUG
513 config ARCH_HAS_WALK_MEMORY
516 config ARCH_ENABLE_MEMORY_HOTREMOVE
519 config PPC64_SUPPORTS_MEMORY_FAILURE
520 bool "Add support for memory hwpoison"
521 depends on PPC_BOOK3S_64
522 default "y" if PPC_POWERNV
523 select ARCH_SUPPORTS_MEMORY_FAILURE
526 bool "kexec system call"
527 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
530 kexec is a system call that implements the ability to shutdown your
531 current kernel, and to start another kernel. It is like a reboot
532 but it is independent of the system firmware. And like a reboot
533 you can start any kernel with it, not just Linux.
535 The name comes from the similarity to the exec system call.
537 It is an ongoing process to be certain the hardware in a machine
538 is properly shutdown, so do not be surprised if this code does not
539 initially work for you. As of this writing the exact hardware
540 interface is strongly in flux, so no good recommendation can be
544 bool "kexec file based system call"
546 select HAVE_IMA_KEXEC
550 depends on CRYPTO_SHA256=y
552 This is a new version of the kexec system call. This call is
553 file based and takes in file descriptors as system call arguments
554 for kernel and initramfs as opposed to a list of segments as is the
555 case for the older kexec call.
558 bool "Build a relocatable kernel"
559 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
560 select NONSTATIC_KERNEL
561 select MODULE_REL_CRCS if MODVERSIONS
563 This builds a kernel image that is capable of running at the
564 location the kernel is loaded at. For ppc32, there is no any
565 alignment restrictions, and this feature is a superset of
566 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
567 16k-aligned base address. The kernel is linked as a
568 position-independent executable (PIE) and contains dynamic relocations
569 which are processed early in the bootup process.
571 One use is for the kexec on panic case where the recovery kernel
572 must live at a different physical address than the primary
575 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
576 it has been loaded at and the compile time physical addresses
577 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
578 setting can still be useful to bootwrappers that need to know the
579 load address of the kernel (eg. u-boot/mkimage).
581 config RELOCATABLE_TEST
582 bool "Test relocatable kernel"
583 depends on (PPC64 && RELOCATABLE)
586 This runs the relocatable kernel at the address it was initially
587 loaded at, which tends to be non-zero and therefore test the
591 bool "Build a dump capture kernel"
592 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
593 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
595 Build a kernel suitable for use as a dump capture kernel.
596 The same kernel binary can be used as production kernel and dump
600 bool "Firmware-assisted dump"
601 depends on PPC64 && PPC_RTAS
605 A robust mechanism to get reliable kernel crash dump with
606 assistance from firmware. This approach does not use kexec,
607 instead firmware assists in booting the capture kernel
608 while preserving memory contents. Firmware-assisted dump
609 is meant to be a kdump replacement offering robustness and
610 speed not possible without system firmware assistance.
615 bool "Distribute interrupts on all CPUs by default"
618 This option gives the kernel permission to distribute IRQs across
619 multiple CPUs. Saying N here will route all IRQs to the first
620 CPU. Generally saying Y is safe, although some problems have been
621 reported with SMP Power Macintoshes with this option enabled.
626 default y if SMP && PPC_PSERIES
632 depends on NEED_MULTIPLE_NODES
634 config USE_PERCPU_NUMA_NODE_ID
638 config HAVE_MEMORYLESS_NODES
642 config ARCH_SELECT_MEMORY_MODEL
646 config ARCH_FLATMEM_ENABLE
648 depends on (PPC64 && !NUMA) || PPC32
650 config ARCH_SPARSEMEM_ENABLE
653 select SPARSEMEM_VMEMMAP_ENABLE
655 config ARCH_SPARSEMEM_DEFAULT
657 depends on PPC_BOOK3S_64
659 config SYS_SUPPORTS_HUGETLBFS
662 config ILLEGAL_POINTER_VALUE
664 # This is roughly half way between the top of user space and the bottom
665 # of kernel space, which seems about as good as we can get.
666 default 0x5deadbeef0000000 if PPC64
671 config ARCH_MEMORY_PROBE
673 depends on MEMORY_HOTPLUG
675 # Some NUMA nodes have memory ranges that span
676 # other nodes. Even though a pfn is valid and
677 # between a node's start and end pfns, it may not
678 # reside on that node. See memmap_init_zone()
680 config NODES_SPAN_OTHER_NODES
682 depends on NEED_MULTIPLE_NODES
685 bool "Using standard binutils settings"
689 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
690 Note, that kernel will be able to run only those applications,
691 which had been compiled using binutils later than 2.17.50.0.3 with
692 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
693 the older binutils, you can patch them with a trivial patch, which
694 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
700 Select the kernel logical page size. Increasing the page size
701 will reduce software overhead at each page boundary, allow
702 hardware prefetch mechanisms to be more effective, and allow
703 larger dma transfers increasing IO efficiency and reducing
704 overhead. However the utilization of memory will increase.
705 For example, each cached file will using a multiple of the
706 page size to hold its contents and the difference between the
707 end of file and the end of page is wasted.
709 Some dedicated systems, such as software raid serving with
710 accelerated calculations, have shown significant increases.
712 If you configure a 64 bit kernel for 64k pages but the
713 processor does not support them, then the kernel will simulate
714 them with 4k pages, loading them on demand, but with the
715 reduced software overhead and larger internal fragmentation.
716 For the 32 bit kernel, a large page option will not be offered
717 unless it is supported by the configured processor.
719 If unsure, choose 4K_PAGES.
723 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
727 depends on 44x || PPC_8xx
731 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
732 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
734 config PPC_256K_PAGES
735 bool "256k page size"
736 depends on 44x && !STDBINUTILS
738 Make the page size 256k.
740 As the ELF standard only requires alignment to support page
741 sizes up to 64k, you will need to compile all of your user
742 space applications with a non-standard binutils settings
743 (see the STDBINUTILS description for details).
745 Say N unless you know what you are doing.
750 int "Thread shift" if EXPERT
752 default "15" if PPC_256K_PAGES
753 default "14" if PPC64
756 Used to define the stack size. The default is almost always what you
757 want. Only change this if you know what you are doing.
759 config FORCE_MAX_ZONEORDER
760 int "Maximum zone order"
761 range 8 9 if PPC64 && PPC_64K_PAGES
762 default "9" if PPC64 && PPC_64K_PAGES
763 range 13 13 if PPC64 && !PPC_64K_PAGES
764 default "13" if PPC64 && !PPC_64K_PAGES
765 range 9 64 if PPC32 && PPC_16K_PAGES
766 default "9" if PPC32 && PPC_16K_PAGES
767 range 7 64 if PPC32 && PPC_64K_PAGES
768 default "7" if PPC32 && PPC_64K_PAGES
769 range 5 64 if PPC32 && PPC_256K_PAGES
770 default "5" if PPC32 && PPC_256K_PAGES
774 The kernel memory allocator divides physically contiguous memory
775 blocks into "zones", where each zone is a power of two number of
776 pages. This option selects the largest power of two that the kernel
777 keeps in the memory allocator. If you need to allocate very large
778 blocks of physically contiguous memory, then you may need to
781 This config option is actually maximum order plus one. For example,
782 a value of 11 means that the largest free memory block is 2^10 pages.
784 The page size is not necessarily 4KB. For example, on 64-bit
785 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
786 this in mind when choosing a value for this option.
788 config PPC_SUBPAGE_PROT
789 bool "Support setting protections for 4k subpages"
790 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
792 This option adds support for a system call to allow user programs
793 to set access permissions (read/write, readonly, or no access)
794 on the 4k subpages of each 64k page.
796 config PPC_COPRO_BASE
801 bool "SMT (Hyperthreading) scheduler support"
802 depends on PPC64 && SMP
804 SMT scheduler support improves the CPU scheduler's decision making
805 when dealing with POWER5 cpus at a cost of slightly increased
806 overhead in some places. If unsure say N here.
808 config PPC_DENORMALISATION
809 bool "PowerPC denormalisation exception handling"
810 depends on PPC_BOOK3S_64
811 default "y" if PPC_POWERNV
813 Add support for handling denormalisation of single precision
814 values. Useful for bare metal only. If unsure say Y here.
817 bool "Default bootloader kernel arguments"
820 string "Initial kernel command string"
821 depends on CMDLINE_BOOL
822 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
824 On some platforms, there is currently no way for the boot loader to
825 pass arguments to the kernel. For these platforms, you can supply
826 some command-line options at build time by entering them here. In
827 most cases you will need to specify the root device here.
830 bool "Always use the default kernel command string"
831 depends on CMDLINE_BOOL
833 Always use the default kernel command string, even if the boot
834 loader passes other arguments to the kernel.
835 This is useful if you cannot or don't want to change the
836 command-line options your boot loader passes to the kernel.
839 string "Additional default image types"
841 List additional targets to be built by the bootwrapper here (separated
842 by spaces). This is useful for targets that depend of device tree
843 files in the .dts directory.
845 Targets in this list will be build as part of the default build
846 target, or when the user does a 'make zImage' or a
847 'make zImage.initrd'.
849 If unsure, leave blank
851 config ARCH_WANTS_FREEZER_CONTROL
855 source kernel/power/Kconfig
858 bool "Enable seccomp to safely compute untrusted bytecode"
862 This kernel feature is useful for number crunching applications
863 that may need to compute untrusted bytecode during their
864 execution. By using pipes or other transports made available to
865 the process as file descriptors supporting the read/write
866 syscalls, it's possible to isolate those applications in
867 their own address space using seccomp. Once seccomp is
868 enabled via /proc/<pid>/seccomp, it cannot be disabled
869 and the task is only allowed to execute a few safe syscalls
870 defined by each seccomp mode.
872 If unsure, say Y. Only embedded should say N here.
883 bool "Support for ISA-bus hardware"
887 Find out whether you have ISA slots on your motherboard. ISA is the
888 name of a bus system, i.e. the way the CPU talks to the other stuff
889 inside your box. If you have an Apple machine, say N here; if you
890 have an IBM RS/6000 or pSeries machine, say Y. If you have an
891 embedded board, consult your board documentation.
897 config NEED_DMA_MAP_STATE
898 def_bool (PPC64 || NOT_COHERENT_CACHE)
900 config NEED_SG_DMA_LENGTH
903 config GENERIC_ISA_DMA
905 depends on ISA_DMA_API
908 config PPC_INDIRECT_PCI
911 default y if 40x || 44x
925 select PPC_INDIRECT_PCI
931 depends on SUSPEND && (PPC_85xx || PPC_86xx)
933 Freescale MPC85xx/MPC86xx power management controller support
934 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
939 depends on SUSPEND && (44x || 40x)
941 PPC4xx Clock Power Management (CPM) support (suspend/resume).
942 It also enables support for two different idle states (idle-wait
949 bool "Freescale Local Bus support"
951 Enables reporting of errors from the Freescale local bus
952 controller. Also contains some common code used by
953 drivers for specific local bus peripherals.
957 depends on PPC_83xx || QUICC_ENGINE || CPM2
959 Freescale General-purpose Timers support
961 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
965 # Platforms that what PCI turned unconditionally just do select PCI
966 # in their config node. Platforms that want to choose at config
967 # time should select PPC_PCI_CHOICE
968 config PPC_PCI_CHOICE
972 bool "PCI support" if PPC_PCI_CHOICE
973 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
974 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
975 default PCI_QSPAN if !4xx && !CPM2 && 8xx
976 select GENERIC_PCI_IOMAP
978 Find out whether your system includes a PCI bus. PCI is the name of
979 a bus system, i.e. the way the CPU talks to the other stuff inside
980 your box. If you say Y here, the kernel will include drivers and
981 infrastructure code to support PCI bus devices.
991 depends on !4xx && !CPM2 && 8xx
994 Say Y here if you have a system based on a Motorola 8xx-series
995 embedded processor with a QSPAN PCI interface, otherwise say N.
999 depends on PCI && 8260
1000 select PPC_INDIRECT_PCI
1003 source "drivers/pci/Kconfig"
1005 source "drivers/pcmcia/Kconfig"
1012 tristate "RapidIO support"
1013 depends on HAS_RAPIDIO || PCI
1015 If you say Y here, the kernel will include drivers and
1016 infrastructure code to support RapidIO interconnect devices.
1019 bool "Freescale Embedded SRIO Controller support"
1020 depends on RAPIDIO = y && HAS_RAPIDIO
1023 Include support for RapidIO controller on Freescale embedded
1024 processors (MPC8548, MPC8641, etc).
1026 source "drivers/rapidio/Kconfig"
1030 config NONSTATIC_KERNEL
1034 menu "Advanced setup"
1037 config ADVANCED_OPTIONS
1038 bool "Prompt for advanced kernel configuration options"
1040 This option will enable prompting for a variety of advanced kernel
1041 configuration options. These options can cause the kernel to not
1042 work if they are set incorrectly, but can be used to optimize certain
1043 aspects of kernel memory management.
1045 Unless you know what you are doing, say N here.
1047 comment "Default settings for advanced configuration options are used"
1048 depends on !ADVANCED_OPTIONS
1050 config LOWMEM_SIZE_BOOL
1051 bool "Set maximum low memory"
1052 depends on ADVANCED_OPTIONS
1054 This option allows you to set the maximum amount of memory which
1055 will be used as "low memory", that is, memory which the kernel can
1056 access directly, without having to set up a kernel virtual mapping.
1057 This can be useful in optimizing the layout of kernel virtual
1060 Say N here unless you know what you are doing.
1063 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1064 default "0x30000000"
1066 config LOWMEM_CAM_NUM_BOOL
1067 bool "Set number of CAMs to use to map low memory"
1068 depends on ADVANCED_OPTIONS && FSL_BOOKE
1070 This option allows you to set the maximum number of CAM slots that
1071 will be used to map low memory. There are a limited number of slots
1072 available and even more limited number that will fit in the L1 MMU.
1073 However, using more entries will allow mapping more low memory. This
1074 can be useful in optimizing the layout of kernel virtual memory.
1076 Say N here unless you know what you are doing.
1078 config LOWMEM_CAM_NUM
1079 depends on FSL_BOOKE
1080 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1083 config DYNAMIC_MEMSTART
1084 bool "Enable page aligned dynamic load address for kernel"
1085 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1086 select NONSTATIC_KERNEL
1088 This option enables the kernel to be loaded at any page aligned
1089 physical address. The kernel creates a mapping from KERNELBASE to
1090 the address where the kernel is loaded. The page size here implies
1091 the TLB page size of the mapping for kernel on the particular platform.
1092 Please refer to the init code for finding the TLB page size.
1094 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1095 kernel image, where the only restriction is the page aligned kernel
1096 load address. When this option is enabled, the compile time physical
1097 address CONFIG_PHYSICAL_START is ignored.
1099 This option is overridden by CONFIG_RELOCATABLE
1101 config PAGE_OFFSET_BOOL
1102 bool "Set custom page offset address"
1103 depends on ADVANCED_OPTIONS
1105 This option allows you to set the kernel virtual address at which
1106 the kernel will map low memory. This can be useful in optimizing
1107 the virtual memory layout of the system.
1109 Say N here unless you know what you are doing.
1112 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1113 default "0xc0000000"
1115 config KERNEL_START_BOOL
1116 bool "Set custom kernel base address"
1117 depends on ADVANCED_OPTIONS
1119 This option allows you to set the kernel virtual address at which
1120 the kernel will be loaded. Normally this should match PAGE_OFFSET
1121 however there are times (like kdump) that one might not want them
1124 Say N here unless you know what you are doing.
1127 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1128 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1129 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1130 default "0xc0000000"
1132 config PHYSICAL_START_BOOL
1133 bool "Set physical address where the kernel is loaded"
1134 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1136 This gives the physical address where the kernel is loaded.
1138 Say N here unless you know what you are doing.
1140 config PHYSICAL_START
1141 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1142 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1143 default "0x00000000"
1145 config PHYSICAL_ALIGN
1147 default "0x04000000" if FSL_BOOKE
1149 This value puts the alignment restrictions on physical address
1150 where kernel is loaded and run from. Kernel is compiled for an
1151 address which meets above alignment restriction.
1153 config TASK_SIZE_BOOL
1154 bool "Set custom user task size"
1155 depends on ADVANCED_OPTIONS
1157 This option allows you to set the amount of virtual address space
1158 allocated to user tasks. This can be useful in optimizing the
1159 virtual memory layout of the system.
1161 Say N here unless you know what you are doing.
1164 hex "Size of user task space" if TASK_SIZE_BOOL
1165 default "0x80000000" if PPC_8xx
1166 default "0xc0000000"
1168 config CONSISTENT_SIZE_BOOL
1169 bool "Set custom consistent memory pool size"
1170 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1172 This option allows you to set the size of the
1173 consistent memory pool. This pool of virtual memory
1174 is used to make consistent memory allocations.
1176 config CONSISTENT_SIZE
1177 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1178 default "0x00200000" if NOT_COHERENT_CACHE
1181 bool "Pinned Kernel TLBs (860 ONLY)"
1182 depends on ADVANCED_OPTIONS && 8xx
1185 bool "Pinned TLB for IMMR"
1191 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1194 default "0xc000000000000000"
1197 default "0xc000000000000000"
1198 config PHYSICAL_START
1200 default "0x00000000"
1206 source "net/Kconfig"
1208 source "drivers/Kconfig"
1212 source "lib/Kconfig"
1214 source "arch/powerpc/Kconfig.debug"
1216 source "security/Kconfig"
1220 depends on COMPAT && KEYS
1223 source "crypto/Kconfig"
1225 config PPC_LIB_RHEAP
1228 source "arch/powerpc/kvm/Kconfig"
1230 source "kernel/livepatch/Kconfig"
projects / mirror_ubuntu-bionic-kernel.git / blob