1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
16 config ARCH_PHYS_ADDR_T_64BIT
17 def_bool PPC64 || PHYS_64BIT
19 config ARCH_DMA_ADDR_T_64BIT
20 def_bool ARCH_PHYS_ADDR_T_64BIT
26 config ARCH_MMAP_RND_BITS_MAX
27 # On Book3S 64, the default virtual address space for 64-bit processes
28 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
29 # 32T of address space (2^45), which should ensure a reasonable gap
30 # between bottom-up and top-down allocations for applications that
31 # consume "normal" amounts of address space. Book3S 64 only supports 64K
33 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
34 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
36 # On all other 64-bit platforms (currently only Book3E), the virtual
37 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
38 # of address space (2^44). Only 4K page sizes are supported.
39 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
41 # For 32-bit, use the compat values, as they're the same.
42 default ARCH_MMAP_RND_COMPAT_BITS_MAX
44 config ARCH_MMAP_RND_BITS_MIN
45 # Allow randomisation to consume up to 1GB of address space (2^30).
46 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
47 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
49 # For 32-bit, use the compat values, as they're the same.
50 default ARCH_MMAP_RND_COMPAT_BITS_MIN
52 config ARCH_MMAP_RND_COMPAT_BITS_MAX
53 # Total virtual address space for 32-bit processes is 2^31 (2GB).
54 # Allow randomisation to consume up to 512MB of address space (2^29).
55 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
56 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
57 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
58 default 17 # 17 = 29 (512MB) - 12 (4K)
60 config ARCH_MMAP_RND_COMPAT_BITS_MIN
61 # Total virtual address space for 32-bit processes is 2^31 (2GB).
62 # Allow randomisation to consume up to 8MB of address space (2^23).
63 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
64 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
65 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
66 default 11 # 11 = 23 (8MB) - 12 (4K)
68 config HAVE_SETUP_PER_CPU_AREA
71 config NEED_PER_CPU_EMBED_FIRST_CHUNK
75 int "Number of virtual interrupt numbers"
79 This defines the number of virtual interrupt numbers the kernel
80 can manage. Virtual interrupt numbers are what you see in
81 /proc/interrupts. If you configure your system to have too few,
82 drivers will fail to load or worse - handle with care.
86 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
91 depends on HARDLOCKUP_DETECTOR
92 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
95 This is a placeholder when the powerpc hardlockup detector
96 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
97 seleted via the generic lockup detector menu which is why we
98 have no standalone config option for it here.
100 config STACKTRACE_SUPPORT
104 config TRACE_IRQFLAGS_SUPPORT
108 config LOCKDEP_SUPPORT
112 config RWSEM_GENERIC_SPINLOCK
115 config RWSEM_XCHGADD_ALGORITHM
119 config GENERIC_LOCKBREAK
122 depends on SMP && PREEMPT
124 config GENERIC_HWEIGHT
128 config ARCH_HAS_DMA_SET_COHERENT_MASK
135 # Please keep this list sorted alphabetically.
137 select ARCH_HAS_DEVMEM_IS_ALLOWED
138 select ARCH_HAS_DMA_SET_COHERENT_MASK
139 select ARCH_HAS_ELF_RANDOMIZE
140 select ARCH_HAS_FORTIFY_SOURCE
141 select ARCH_HAS_GCOV_PROFILE_ALL
142 select ARCH_HAS_PHYS_TO_DMA
143 select ARCH_HAS_PMEM_API if PPC64
144 select ARCH_HAS_MEMBARRIER_CALLBACKS
145 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
146 select ARCH_HAS_SG_CHAIN
147 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
148 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
149 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
150 select ARCH_HAS_UBSAN_SANITIZE_ALL
151 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
152 select ARCH_HAVE_NMI_SAFE_CMPXCHG
153 select ARCH_MIGHT_HAVE_PC_PARPORT
154 select ARCH_MIGHT_HAVE_PC_SERIO
155 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
156 select ARCH_SUPPORTS_ATOMIC_RMW
157 select ARCH_USE_BUILTIN_BSWAP
158 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
159 select ARCH_WANT_IPC_PARSE_VERSION
160 select ARCH_WEAK_RELEASE_ACQUIRE
162 select BUILDTIME_EXTABLE_SORT
163 select CLONE_BACKWARDS
164 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
165 select EDAC_ATOMIC_SCRUB
167 select GENERIC_ATOMIC64 if PPC32
168 select GENERIC_CLOCKEVENTS
169 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
170 select GENERIC_CMOS_UPDATE
171 select GENERIC_CPU_AUTOPROBE
172 select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64
173 select GENERIC_IRQ_SHOW
174 select GENERIC_IRQ_SHOW_LEVEL
175 select GENERIC_SMP_IDLE_THREAD
176 select GENERIC_STRNCPY_FROM_USER
177 select GENERIC_STRNLEN_USER
178 select GENERIC_TIME_VSYSCALL
179 select HAVE_ARCH_AUDITSYSCALL
180 select HAVE_ARCH_JUMP_LABEL
181 select HAVE_ARCH_KGDB
182 select HAVE_ARCH_MMAP_RND_BITS
183 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
184 select HAVE_ARCH_SECCOMP_FILTER
185 select HAVE_ARCH_TRACEHOOK
186 select HAVE_CBPF_JIT if !PPC64
187 select HAVE_CONTEXT_TRACKING if PPC64
188 select HAVE_DEBUG_KMEMLEAK
189 select HAVE_DEBUG_STACKOVERFLOW
190 select HAVE_DMA_API_DEBUG
191 select HAVE_DYNAMIC_FTRACE
192 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
193 select HAVE_EBPF_JIT if PPC64
194 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
195 select HAVE_FTRACE_MCOUNT_RECORD
196 select HAVE_FUNCTION_GRAPH_TRACER
197 select HAVE_FUNCTION_TRACER
198 select HAVE_GCC_PLUGINS
199 select HAVE_GENERIC_GUP
200 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
202 select HAVE_IOREMAP_PROT
203 select HAVE_IRQ_EXIT_ON_IRQ_STACK
204 select HAVE_KERNEL_GZIP
206 select HAVE_KPROBES_ON_FTRACE
207 select HAVE_KRETPROBES
208 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
210 select HAVE_MEMBLOCK_NODE_MAP
211 select HAVE_MOD_ARCH_SPECIFIC
212 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
213 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
215 select HAVE_OPTPROBES if PPC64
216 select HAVE_PERF_EVENTS
217 select HAVE_PERF_EVENTS_NMI if PPC64
218 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
219 select HAVE_PERF_REGS
220 select HAVE_PERF_USER_STACK_DUMP
221 select HAVE_RCU_TABLE_FREE if SMP
222 select HAVE_REGS_AND_STACK_ACCESS_API
223 select HAVE_SYSCALL_TRACEPOINTS
224 select HAVE_VIRT_CPU_ACCOUNTING
225 select HAVE_IRQ_TIME_ACCOUNTING
227 select IRQ_FORCED_THREADING
228 select MODULES_USE_ELF_RELA
231 select OF_EARLY_FLATTREE
232 select OF_RESERVED_MEM
233 select OLD_SIGACTION if PPC32
234 select OLD_SIGSUSPEND
236 select SYSCTL_EXCEPTION_TRACE
237 select VIRT_TO_BUS if !PPC64
239 # Please keep this list sorted alphabetically.
256 select COMPAT_BINFMT_ELF
257 select ARCH_WANT_OLD_COMPAT_IPC
258 select COMPAT_OLD_SIGACTION
260 config SYSVIPC_COMPAT
262 depends on COMPAT && SYSVIPC
265 # All PPC32s use generic nvram driver through ppc_md
270 config SCHED_OMIT_FRAME_POINTER
274 config ARCH_MAY_HAVE_PC_FDC
278 config PPC_UDBG_16550
282 config GENERIC_TBSYNC
284 default y if PPC32 && SMP
296 config SYS_SUPPORTS_APM_EMULATION
297 default y if PMAC_APM_EMU
303 Used to allow a board to specify it wants an ePAPR compliant wrapper.
306 config DEFAULT_UIMAGE
309 Used to allow a board to specify it wants a uImage built by default
312 config ARCH_HIBERNATION_POSSIBLE
316 config ARCH_SUSPEND_POSSIBLE
318 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
319 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
322 config PPC_DCR_NATIVE
332 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
335 config PPC_OF_PLATFORM_PCI
338 depends on PPC64 # not supported on 32 bits yet
341 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
342 depends on PPC32 || PPC_BOOK3S_64
345 config ARCH_SUPPORTS_UPROBES
348 config PPC_ADV_DEBUG_REGS
350 depends on 40x || BOOKE
353 config PPC_ADV_DEBUG_IACS
355 depends on PPC_ADV_DEBUG_REGS
359 config PPC_ADV_DEBUG_DACS
361 depends on PPC_ADV_DEBUG_REGS
364 config PPC_ADV_DEBUG_DVCS
366 depends on PPC_ADV_DEBUG_REGS
370 config PPC_ADV_DEBUG_DAC_RANGE
372 depends on PPC_ADV_DEBUG_REGS && 44x
379 config PGTABLE_LEVELS
382 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
385 source "init/Kconfig"
387 source "kernel/Kconfig.freezer"
389 source "arch/powerpc/sysdev/Kconfig"
390 source "arch/powerpc/platforms/Kconfig"
392 menu "Kernel options"
395 bool "High memory support"
398 source kernel/Kconfig.hz
399 source kernel/Kconfig.preempt
400 source "fs/Kconfig.binfmt"
402 config HUGETLB_PAGE_SIZE_VARIABLE
404 depends on HUGETLB_PAGE
407 config MATH_EMULATION
408 bool "Math emulation"
409 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
411 Some PowerPC chips designed for embedded applications do not have
412 a floating-point unit and therefore do not implement the
413 floating-point instructions in the PowerPC instruction set. If you
414 say Y here, the kernel will include code to emulate a floating-point
415 unit, which will allow programs that use floating-point
418 This is also useful to emulate missing (optional) instructions
419 such as fsqrt on cores that do have an FPU but do not implement
420 them (such as Freescale BookE).
423 prompt "Math emulation options"
424 default MATH_EMULATION_FULL
425 depends on MATH_EMULATION
427 config MATH_EMULATION_FULL
428 bool "Emulate all the floating point instructions"
430 Select this option will enable the kernel to support to emulate
431 all the floating point instructions. If your SoC doesn't have
432 a FPU, you should select this.
434 config MATH_EMULATION_HW_UNIMPLEMENTED
435 bool "Just emulate the FPU unimplemented instructions"
437 Select this if you know there does have a hardware FPU on your
438 SoC, but some floating point instructions are not implemented by that.
442 config PPC_TRANSACTIONAL_MEM
443 bool "Transactional Memory support for POWERPC"
444 depends on PPC_BOOK3S_64
450 Support user-mode Transactional Memory on POWERPC.
452 config LD_HEAD_STUB_CATCH
453 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
457 Very large kernels can cause linker branch stubs to be generated by
458 code in head_64.S, which moves the head text sections out of their
459 specified location. This option can work around the problem.
463 config DISABLE_MPROFILE_KERNEL
464 bool "Disable use of mprofile-kernel for kernel tracing"
465 depends on PPC64 && CPU_LITTLE_ENDIAN
468 Selecting this options disables use of the mprofile-kernel ABI for
469 kernel tracing. That will cause options such as live patching
470 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
473 If you have a toolchain which supports mprofile-kernel, then you can
474 disable this. Otherwise leave it enabled. If you're not sure, say
477 config MPROFILE_KERNEL
478 depends on PPC64 && CPU_LITTLE_ENDIAN
479 def_bool !DISABLE_MPROFILE_KERNEL
485 bool "SWIOTLB support"
489 Support for IO bounce buffering for systems without an IOMMU.
490 This allows us to DMA to the full physical address space on
491 platforms where the size of a physical address is larger
492 than the bus address. Not all platforms support this.
495 bool "Support for enabling/disabling CPUs"
496 depends on SMP && (PPC_PSERIES || \
497 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
499 Say Y here to be able to disable and re-enable individual
500 CPUs at runtime on SMP machines.
502 Say N if you are unsure.
504 config ARCH_CPU_PROBE_RELEASE
506 depends on HOTPLUG_CPU
508 config ARCH_ENABLE_MEMORY_HOTPLUG
511 config ARCH_HAS_WALK_MEMORY
514 config ARCH_ENABLE_MEMORY_HOTREMOVE
517 config PPC64_SUPPORTS_MEMORY_FAILURE
518 bool "Add support for memory hwpoison"
519 depends on PPC_BOOK3S_64
520 default "y" if PPC_POWERNV
521 select ARCH_SUPPORTS_MEMORY_FAILURE
524 bool "kexec system call"
525 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
528 kexec is a system call that implements the ability to shutdown your
529 current kernel, and to start another kernel. It is like a reboot
530 but it is independent of the system firmware. And like a reboot
531 you can start any kernel with it, not just Linux.
533 The name comes from the similarity to the exec system call.
535 It is an ongoing process to be certain the hardware in a machine
536 is properly shutdown, so do not be surprised if this code does not
537 initially work for you. As of this writing the exact hardware
538 interface is strongly in flux, so no good recommendation can be
542 bool "kexec file based system call"
544 select HAVE_IMA_KEXEC
548 depends on CRYPTO_SHA256=y
550 This is a new version of the kexec system call. This call is
551 file based and takes in file descriptors as system call arguments
552 for kernel and initramfs as opposed to a list of segments as is the
553 case for the older kexec call.
555 config ARCH_HAS_KEXEC_PURGATORY
559 bool "Build a relocatable kernel"
560 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
561 select NONSTATIC_KERNEL
562 select MODULE_REL_CRCS if MODVERSIONS
564 This builds a kernel image that is capable of running at the
565 location the kernel is loaded at. For ppc32, there is no any
566 alignment restrictions, and this feature is a superset of
567 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
568 16k-aligned base address. The kernel is linked as a
569 position-independent executable (PIE) and contains dynamic relocations
570 which are processed early in the bootup process.
572 One use is for the kexec on panic case where the recovery kernel
573 must live at a different physical address than the primary
576 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
577 it has been loaded at and the compile time physical addresses
578 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
579 setting can still be useful to bootwrappers that need to know the
580 load address of the kernel (eg. u-boot/mkimage).
582 config RELOCATABLE_TEST
583 bool "Test relocatable kernel"
584 depends on (PPC64 && RELOCATABLE)
587 This runs the relocatable kernel at the address it was initially
588 loaded at, which tends to be non-zero and therefore test the
592 bool "Build a dump capture kernel"
593 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
594 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
596 Build a kernel suitable for use as a dump capture kernel.
597 The same kernel binary can be used as production kernel and dump
601 bool "Firmware-assisted dump"
602 depends on PPC64 && PPC_RTAS
606 A robust mechanism to get reliable kernel crash dump with
607 assistance from firmware. This approach does not use kexec,
608 instead firmware assists in booting the capture kernel
609 while preserving memory contents. Firmware-assisted dump
610 is meant to be a kdump replacement offering robustness and
611 speed not possible without system firmware assistance.
616 bool "Distribute interrupts on all CPUs by default"
619 This option gives the kernel permission to distribute IRQs across
620 multiple CPUs. Saying N here will route all IRQs to the first
621 CPU. Generally saying Y is safe, although some problems have been
622 reported with SMP Power Macintoshes with this option enabled.
627 default y if SMP && PPC_PSERIES
633 depends on NEED_MULTIPLE_NODES
635 config USE_PERCPU_NUMA_NODE_ID
639 config HAVE_MEMORYLESS_NODES
643 config ARCH_SELECT_MEMORY_MODEL
647 config ARCH_FLATMEM_ENABLE
649 depends on (PPC64 && !NUMA) || PPC32
651 config ARCH_SPARSEMEM_ENABLE
654 select SPARSEMEM_VMEMMAP_ENABLE
656 config ARCH_SPARSEMEM_DEFAULT
658 depends on PPC_BOOK3S_64
660 config SYS_SUPPORTS_HUGETLBFS
663 config ILLEGAL_POINTER_VALUE
665 # This is roughly half way between the top of user space and the bottom
666 # of kernel space, which seems about as good as we can get.
667 default 0x5deadbeef0000000 if PPC64
672 config ARCH_MEMORY_PROBE
674 depends on MEMORY_HOTPLUG
676 # Some NUMA nodes have memory ranges that span
677 # other nodes. Even though a pfn is valid and
678 # between a node's start and end pfns, it may not
679 # reside on that node. See memmap_init_zone()
681 config NODES_SPAN_OTHER_NODES
683 depends on NEED_MULTIPLE_NODES
686 bool "Using standard binutils settings"
690 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
691 Note, that kernel will be able to run only those applications,
692 which had been compiled using binutils later than 2.17.50.0.3 with
693 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
694 the older binutils, you can patch them with a trivial patch, which
695 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
701 Select the kernel logical page size. Increasing the page size
702 will reduce software overhead at each page boundary, allow
703 hardware prefetch mechanisms to be more effective, and allow
704 larger dma transfers increasing IO efficiency and reducing
705 overhead. However the utilization of memory will increase.
706 For example, each cached file will using a multiple of the
707 page size to hold its contents and the difference between the
708 end of file and the end of page is wasted.
710 Some dedicated systems, such as software raid serving with
711 accelerated calculations, have shown significant increases.
713 If you configure a 64 bit kernel for 64k pages but the
714 processor does not support them, then the kernel will simulate
715 them with 4k pages, loading them on demand, but with the
716 reduced software overhead and larger internal fragmentation.
717 For the 32 bit kernel, a large page option will not be offered
718 unless it is supported by the configured processor.
720 If unsure, choose 4K_PAGES.
724 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
728 depends on 44x || PPC_8xx
732 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
733 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
735 config PPC_256K_PAGES
736 bool "256k page size"
737 depends on 44x && !STDBINUTILS
739 Make the page size 256k.
741 As the ELF standard only requires alignment to support page
742 sizes up to 64k, you will need to compile all of your user
743 space applications with a non-standard binutils settings
744 (see the STDBINUTILS description for details).
746 Say N unless you know what you are doing.
751 int "Thread shift" if EXPERT
753 default "15" if PPC_256K_PAGES
754 default "14" if PPC64
757 Used to define the stack size. The default is almost always what you
758 want. Only change this if you know what you are doing.
760 config FORCE_MAX_ZONEORDER
761 int "Maximum zone order"
762 range 8 9 if PPC64 && PPC_64K_PAGES
763 default "9" if PPC64 && PPC_64K_PAGES
764 range 13 13 if PPC64 && !PPC_64K_PAGES
765 default "13" if PPC64 && !PPC_64K_PAGES
766 range 9 64 if PPC32 && PPC_16K_PAGES
767 default "9" if PPC32 && PPC_16K_PAGES
768 range 7 64 if PPC32 && PPC_64K_PAGES
769 default "7" if PPC32 && PPC_64K_PAGES
770 range 5 64 if PPC32 && PPC_256K_PAGES
771 default "5" if PPC32 && PPC_256K_PAGES
775 The kernel memory allocator divides physically contiguous memory
776 blocks into "zones", where each zone is a power of two number of
777 pages. This option selects the largest power of two that the kernel
778 keeps in the memory allocator. If you need to allocate very large
779 blocks of physically contiguous memory, then you may need to
782 This config option is actually maximum order plus one. For example,
783 a value of 11 means that the largest free memory block is 2^10 pages.
785 The page size is not necessarily 4KB. For example, on 64-bit
786 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
787 this in mind when choosing a value for this option.
789 config PPC_SUBPAGE_PROT
790 bool "Support setting protections for 4k subpages"
791 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
793 This option adds support for a system call to allow user programs
794 to set access permissions (read/write, readonly, or no access)
795 on the 4k subpages of each 64k page.
797 config PPC_COPRO_BASE
802 bool "SMT (Hyperthreading) scheduler support"
803 depends on PPC64 && SMP
805 SMT scheduler support improves the CPU scheduler's decision making
806 when dealing with POWER5 cpus at a cost of slightly increased
807 overhead in some places. If unsure say N here.
809 config PPC_DENORMALISATION
810 bool "PowerPC denormalisation exception handling"
811 depends on PPC_BOOK3S_64
812 default "y" if PPC_POWERNV
814 Add support for handling denormalisation of single precision
815 values. Useful for bare metal only. If unsure say Y here.
818 bool "Default bootloader kernel arguments"
821 string "Initial kernel command string"
822 depends on CMDLINE_BOOL
823 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
825 On some platforms, there is currently no way for the boot loader to
826 pass arguments to the kernel. For these platforms, you can supply
827 some command-line options at build time by entering them here. In
828 most cases you will need to specify the root device here.
831 bool "Always use the default kernel command string"
832 depends on CMDLINE_BOOL
834 Always use the default kernel command string, even if the boot
835 loader passes other arguments to the kernel.
836 This is useful if you cannot or don't want to change the
837 command-line options your boot loader passes to the kernel.
840 string "Additional default image types"
842 List additional targets to be built by the bootwrapper here (separated
843 by spaces). This is useful for targets that depend of device tree
844 files in the .dts directory.
846 Targets in this list will be build as part of the default build
847 target, or when the user does a 'make zImage' or a
848 'make zImage.initrd'.
850 If unsure, leave blank
852 config ARCH_WANTS_FREEZER_CONTROL
856 source kernel/power/Kconfig
859 bool "Enable seccomp to safely compute untrusted bytecode"
863 This kernel feature is useful for number crunching applications
864 that may need to compute untrusted bytecode during their
865 execution. By using pipes or other transports made available to
866 the process as file descriptors supporting the read/write
867 syscalls, it's possible to isolate those applications in
868 their own address space using seccomp. Once seccomp is
869 enabled via /proc/<pid>/seccomp, it cannot be disabled
870 and the task is only allowed to execute a few safe syscalls
871 defined by each seccomp mode.
873 If unsure, say Y. Only embedded should say N here.
876 prompt "PowerPC Memory Protection Keys"
878 depends on PPC_BOOK3S_64
879 select ARCH_USES_HIGH_VMA_FLAGS
880 select ARCH_HAS_PKEYS
882 Memory Protection Keys provides a mechanism for enforcing
883 page-based protections, but without requiring modification of the
884 page tables when an application changes protection domains.
886 For details, see Documentation/vm/protection-keys.txt
899 bool "Support for ISA-bus hardware"
903 Find out whether you have ISA slots on your motherboard. ISA is the
904 name of a bus system, i.e. the way the CPU talks to the other stuff
905 inside your box. If you have an Apple machine, say N here; if you
906 have an IBM RS/6000 or pSeries machine, say Y. If you have an
907 embedded board, consult your board documentation.
913 config NEED_DMA_MAP_STATE
914 def_bool (PPC64 || NOT_COHERENT_CACHE)
916 config NEED_SG_DMA_LENGTH
919 config GENERIC_ISA_DMA
921 depends on ISA_DMA_API
924 config PPC_INDIRECT_PCI
927 default y if 40x || 44x
941 select PPC_INDIRECT_PCI
947 depends on SUSPEND && (PPC_85xx || PPC_86xx)
949 Freescale MPC85xx/MPC86xx power management controller support
950 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
955 depends on SUSPEND && (44x || 40x)
957 PPC4xx Clock Power Management (CPM) support (suspend/resume).
958 It also enables support for two different idle states (idle-wait
965 bool "Freescale Local Bus support"
967 Enables reporting of errors from the Freescale local bus
968 controller. Also contains some common code used by
969 drivers for specific local bus peripherals.
973 depends on PPC_83xx || QUICC_ENGINE || CPM2
975 Freescale General-purpose Timers support
977 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
981 # Platforms that what PCI turned unconditionally just do select PCI
982 # in their config node. Platforms that want to choose at config
983 # time should select PPC_PCI_CHOICE
984 config PPC_PCI_CHOICE
988 bool "PCI support" if PPC_PCI_CHOICE
989 default y if !40x && !CPM2 && !PPC_8xx && !PPC_83xx \
990 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
991 default PCI_QSPAN if PPC_8xx
992 select GENERIC_PCI_IOMAP
994 Find out whether your system includes a PCI bus. PCI is the name of
995 a bus system, i.e. the way the CPU talks to the other stuff inside
996 your box. If you say Y here, the kernel will include drivers and
997 infrastructure code to support PCI bus devices.
1010 Say Y here if you have a system based on a Motorola 8xx-series
1011 embedded processor with a QSPAN PCI interface, otherwise say N.
1015 depends on PCI && 8260
1016 select PPC_INDIRECT_PCI
1019 source "drivers/pci/Kconfig"
1021 source "drivers/pcmcia/Kconfig"
1028 tristate "RapidIO support"
1029 depends on HAS_RAPIDIO || PCI
1031 If you say Y here, the kernel will include drivers and
1032 infrastructure code to support RapidIO interconnect devices.
1035 bool "Freescale Embedded SRIO Controller support"
1036 depends on RAPIDIO = y && HAS_RAPIDIO
1039 Include support for RapidIO controller on Freescale embedded
1040 processors (MPC8548, MPC8641, etc).
1042 source "drivers/rapidio/Kconfig"
1046 config NONSTATIC_KERNEL
1050 menu "Advanced setup"
1053 config ADVANCED_OPTIONS
1054 bool "Prompt for advanced kernel configuration options"
1056 This option will enable prompting for a variety of advanced kernel
1057 configuration options. These options can cause the kernel to not
1058 work if they are set incorrectly, but can be used to optimize certain
1059 aspects of kernel memory management.
1061 Unless you know what you are doing, say N here.
1063 comment "Default settings for advanced configuration options are used"
1064 depends on !ADVANCED_OPTIONS
1066 config LOWMEM_SIZE_BOOL
1067 bool "Set maximum low memory"
1068 depends on ADVANCED_OPTIONS
1070 This option allows you to set the maximum amount of memory which
1071 will be used as "low memory", that is, memory which the kernel can
1072 access directly, without having to set up a kernel virtual mapping.
1073 This can be useful in optimizing the layout of kernel virtual
1076 Say N here unless you know what you are doing.
1079 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1080 default "0x30000000"
1082 config LOWMEM_CAM_NUM_BOOL
1083 bool "Set number of CAMs to use to map low memory"
1084 depends on ADVANCED_OPTIONS && FSL_BOOKE
1086 This option allows you to set the maximum number of CAM slots that
1087 will be used to map low memory. There are a limited number of slots
1088 available and even more limited number that will fit in the L1 MMU.
1089 However, using more entries will allow mapping more low memory. This
1090 can be useful in optimizing the layout of kernel virtual memory.
1092 Say N here unless you know what you are doing.
1094 config LOWMEM_CAM_NUM
1095 depends on FSL_BOOKE
1096 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1099 config DYNAMIC_MEMSTART
1100 bool "Enable page aligned dynamic load address for kernel"
1101 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1102 select NONSTATIC_KERNEL
1104 This option enables the kernel to be loaded at any page aligned
1105 physical address. The kernel creates a mapping from KERNELBASE to
1106 the address where the kernel is loaded. The page size here implies
1107 the TLB page size of the mapping for kernel on the particular platform.
1108 Please refer to the init code for finding the TLB page size.
1110 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1111 kernel image, where the only restriction is the page aligned kernel
1112 load address. When this option is enabled, the compile time physical
1113 address CONFIG_PHYSICAL_START is ignored.
1115 This option is overridden by CONFIG_RELOCATABLE
1117 config PAGE_OFFSET_BOOL
1118 bool "Set custom page offset address"
1119 depends on ADVANCED_OPTIONS
1121 This option allows you to set the kernel virtual address at which
1122 the kernel will map low memory. This can be useful in optimizing
1123 the virtual memory layout of the system.
1125 Say N here unless you know what you are doing.
1128 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1129 default "0xc0000000"
1131 config KERNEL_START_BOOL
1132 bool "Set custom kernel base address"
1133 depends on ADVANCED_OPTIONS
1135 This option allows you to set the kernel virtual address at which
1136 the kernel will be loaded. Normally this should match PAGE_OFFSET
1137 however there are times (like kdump) that one might not want them
1140 Say N here unless you know what you are doing.
1143 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1144 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1145 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1146 default "0xc0000000"
1148 config PHYSICAL_START_BOOL
1149 bool "Set physical address where the kernel is loaded"
1150 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1152 This gives the physical address where the kernel is loaded.
1154 Say N here unless you know what you are doing.
1156 config PHYSICAL_START
1157 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1158 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1159 default "0x00000000"
1161 config PHYSICAL_ALIGN
1163 default "0x04000000" if FSL_BOOKE
1165 This value puts the alignment restrictions on physical address
1166 where kernel is loaded and run from. Kernel is compiled for an
1167 address which meets above alignment restriction.
1169 config TASK_SIZE_BOOL
1170 bool "Set custom user task size"
1171 depends on ADVANCED_OPTIONS
1173 This option allows you to set the amount of virtual address space
1174 allocated to user tasks. This can be useful in optimizing the
1175 virtual memory layout of the system.
1177 Say N here unless you know what you are doing.
1180 hex "Size of user task space" if TASK_SIZE_BOOL
1181 default "0x80000000" if PPC_8xx
1182 default "0xc0000000"
1184 config CONSISTENT_SIZE_BOOL
1185 bool "Set custom consistent memory pool size"
1186 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1188 This option allows you to set the size of the
1189 consistent memory pool. This pool of virtual memory
1190 is used to make consistent memory allocations.
1192 config CONSISTENT_SIZE
1193 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1194 default "0x00200000" if NOT_COHERENT_CACHE
1197 bool "Pinned Kernel TLBs (860 ONLY)"
1198 depends on ADVANCED_OPTIONS && PPC_8xx && \
1199 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1202 bool "Pinned TLB for DATA"
1207 bool "Pinned TLB for IMMR"
1212 bool "Pinned TLB for TEXT"
1218 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1221 default "0xc000000000000000"
1224 default "0xc000000000000000"
1225 config PHYSICAL_START
1227 default "0x00000000"
1233 source "net/Kconfig"
1235 source "drivers/Kconfig"
1239 source "lib/Kconfig"
1241 source "arch/powerpc/Kconfig.debug"
1243 source "security/Kconfig"
1245 source "crypto/Kconfig"
1247 config PPC_LIB_RHEAP
1250 source "arch/powerpc/kvm/Kconfig"
1252 source "kernel/livepatch/Kconfig"