1 # SPDX-License-Identifier: GPL-2.0
2 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_MMAP_RND_BITS_MAX
21 # On Book3S 64, the default virtual address space for 64-bit processes
22 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
23 # 32T of address space (2^45), which should ensure a reasonable gap
24 # between bottom-up and top-down allocations for applications that
25 # consume "normal" amounts of address space. Book3S 64 only supports 64K
27 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
28 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
30 # On all other 64-bit platforms (currently only Book3E), the virtual
31 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
32 # of address space (2^44). Only 4K page sizes are supported.
33 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
35 # For 32-bit, use the compat values, as they're the same.
36 default ARCH_MMAP_RND_COMPAT_BITS_MAX
38 config ARCH_MMAP_RND_BITS_MIN
39 # Allow randomisation to consume up to 1GB of address space (2^30).
40 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
41 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
43 # For 32-bit, use the compat values, as they're the same.
44 default ARCH_MMAP_RND_COMPAT_BITS_MIN
46 config ARCH_MMAP_RND_COMPAT_BITS_MAX
47 # Total virtual address space for 32-bit processes is 2^31 (2GB).
48 # Allow randomisation to consume up to 512MB of address space (2^29).
49 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
50 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
51 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
52 default 17 # 17 = 29 (512MB) - 12 (4K)
54 config ARCH_MMAP_RND_COMPAT_BITS_MIN
55 # Total virtual address space for 32-bit processes is 2^31 (2GB).
56 # Allow randomisation to consume up to 8MB of address space (2^23).
57 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
58 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
59 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
60 default 11 # 11 = 23 (8MB) - 12 (4K)
62 config HAVE_SETUP_PER_CPU_AREA
65 config NEED_PER_CPU_EMBED_FIRST_CHUNK
69 int "Number of virtual interrupt numbers"
73 This defines the number of virtual interrupt numbers the kernel
74 can manage. Virtual interrupt numbers are what you see in
75 /proc/interrupts. If you configure your system to have too few,
76 drivers will fail to load or worse - handle with care.
80 depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
85 depends on HARDLOCKUP_DETECTOR
86 depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
89 This is a placeholder when the powerpc hardlockup detector
90 watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
91 seleted via the generic lockup detector menu which is why we
92 have no standalone config option for it here.
94 config STACKTRACE_SUPPORT
98 config TRACE_IRQFLAGS_SUPPORT
102 config LOCKDEP_SUPPORT
106 config RWSEM_GENERIC_SPINLOCK
109 config RWSEM_XCHGADD_ALGORITHM
113 config GENERIC_LOCKBREAK
116 depends on SMP && PREEMPT
118 config GENERIC_HWEIGHT
122 config ARCH_HAS_DMA_SET_COHERENT_MASK
129 # Please keep this list sorted alphabetically.
131 select ARCH_HAS_DEVMEM_IS_ALLOWED
132 select ARCH_HAS_DMA_SET_COHERENT_MASK
133 select ARCH_HAS_ELF_RANDOMIZE
134 select ARCH_HAS_FORTIFY_SOURCE
135 select ARCH_HAS_GCOV_PROFILE_ALL
136 select ARCH_HAS_PHYS_TO_DMA
137 select ARCH_HAS_PMEM_API if PPC64
138 select ARCH_HAS_MEMBARRIER_CALLBACKS
139 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
140 select ARCH_HAS_SG_CHAIN
141 select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
142 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
143 select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
144 select ARCH_HAS_UBSAN_SANITIZE_ALL
145 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
146 select ARCH_HAVE_NMI_SAFE_CMPXCHG
147 select ARCH_MIGHT_HAVE_PC_PARPORT
148 select ARCH_MIGHT_HAVE_PC_SERIO
149 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
150 select ARCH_SUPPORTS_ATOMIC_RMW
151 select ARCH_USE_BUILTIN_BSWAP
152 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
153 select ARCH_WANT_IPC_PARSE_VERSION
154 select ARCH_WEAK_RELEASE_ACQUIRE
156 select BUILDTIME_EXTABLE_SORT
157 select CLONE_BACKWARDS
158 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
159 select DYNAMIC_FTRACE if FUNCTION_TRACER
160 select EDAC_ATOMIC_SCRUB
162 select GENERIC_ATOMIC64 if PPC32
163 select GENERIC_CLOCKEVENTS
164 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
165 select GENERIC_CMOS_UPDATE
166 select GENERIC_CPU_AUTOPROBE
167 select GENERIC_CPU_VULNERABILITIES if PPC_BOOK3S_64
168 select GENERIC_IRQ_SHOW
169 select GENERIC_IRQ_SHOW_LEVEL
170 select GENERIC_SMP_IDLE_THREAD
171 select GENERIC_STRNCPY_FROM_USER
172 select GENERIC_STRNLEN_USER
173 select GENERIC_TIME_VSYSCALL
174 select HAVE_ARCH_AUDITSYSCALL
175 select HAVE_ARCH_JUMP_LABEL
176 select HAVE_ARCH_KGDB
177 select HAVE_ARCH_MMAP_RND_BITS
178 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
179 select HAVE_ARCH_SECCOMP_FILTER
180 select HAVE_ARCH_TRACEHOOK
181 select HAVE_CBPF_JIT if !PPC64
182 select HAVE_CONTEXT_TRACKING if PPC64
183 select HAVE_DEBUG_KMEMLEAK
184 select HAVE_DEBUG_STACKOVERFLOW
185 select HAVE_DYNAMIC_FTRACE
186 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
187 select HAVE_EBPF_JIT if PPC64
188 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
189 select HAVE_FTRACE_MCOUNT_RECORD
190 select HAVE_FUNCTION_GRAPH_TRACER
191 select HAVE_FUNCTION_TRACER
192 select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
193 select HAVE_GENERIC_GUP
194 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
196 select HAVE_IOREMAP_PROT
197 select HAVE_IRQ_EXIT_ON_IRQ_STACK
198 select HAVE_KERNEL_GZIP
200 select HAVE_KPROBES_ON_FTRACE
201 select HAVE_KRETPROBES
202 select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
203 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
205 select HAVE_MEMBLOCK_NODE_MAP
206 select HAVE_MOD_ARCH_SPECIFIC
207 select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
208 select HAVE_HARDLOCKUP_DETECTOR_ARCH if (PPC64 && PPC_BOOK3S)
210 select HAVE_OPTPROBES if PPC64
211 select HAVE_PERF_EVENTS
212 select HAVE_PERF_EVENTS_NMI if PPC64
213 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
214 select HAVE_PERF_REGS
215 select HAVE_PERF_USER_STACK_DUMP
216 select HAVE_RCU_TABLE_FREE if SMP
217 select HAVE_REGS_AND_STACK_ACCESS_API
218 select HAVE_RELIABLE_STACKTRACE if PPC64 && CPU_LITTLE_ENDIAN
219 select HAVE_SYSCALL_TRACEPOINTS
220 select HAVE_VIRT_CPU_ACCOUNTING
221 select HAVE_IRQ_TIME_ACCOUNTING
222 select IOMMU_HELPER if PPC64
224 select IRQ_FORCED_THREADING
225 select MODULES_USE_ELF_RELA
226 select NEED_SG_DMA_LENGTH
229 select OF_EARLY_FLATTREE
230 select OF_RESERVED_MEM
231 select OLD_SIGACTION if PPC32
232 select OLD_SIGSUSPEND
235 select SYSCTL_EXCEPTION_TRACE
236 select VIRT_TO_BUS if !PPC64
238 # Please keep this list sorted alphabetically.
255 select COMPAT_BINFMT_ELF
256 select ARCH_WANT_OLD_COMPAT_IPC
257 select COMPAT_OLD_SIGACTION
259 config SYSVIPC_COMPAT
261 depends on COMPAT && SYSVIPC
264 # All PPC32s use generic nvram driver through ppc_md
269 config SCHED_OMIT_FRAME_POINTER
273 config ARCH_MAY_HAVE_PC_FDC
277 config PPC_UDBG_16550
281 config GENERIC_TBSYNC
283 default y if PPC32 && SMP
295 config SYS_SUPPORTS_APM_EMULATION
296 default y if PMAC_APM_EMU
302 Used to allow a board to specify it wants an ePAPR compliant wrapper.
305 config DEFAULT_UIMAGE
308 Used to allow a board to specify it wants a uImage built by default
311 config ARCH_HIBERNATION_POSSIBLE
315 config ARCH_SUSPEND_POSSIBLE
317 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
318 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
321 config PPC_DCR_NATIVE
331 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
334 config PPC_OF_PLATFORM_PCI
337 depends on PPC64 # not supported on 32 bits yet
340 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
341 depends on PPC32 || PPC_BOOK3S_64
344 config ARCH_SUPPORTS_UPROBES
347 config PPC_ADV_DEBUG_REGS
349 depends on 40x || BOOKE
352 config PPC_ADV_DEBUG_IACS
354 depends on PPC_ADV_DEBUG_REGS
358 config PPC_ADV_DEBUG_DACS
360 depends on PPC_ADV_DEBUG_REGS
363 config PPC_ADV_DEBUG_DVCS
365 depends on PPC_ADV_DEBUG_REGS
369 config PPC_ADV_DEBUG_DAC_RANGE
371 depends on PPC_ADV_DEBUG_REGS && 44x
378 config PGTABLE_LEVELS
381 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
384 source "init/Kconfig"
386 source "kernel/Kconfig.freezer"
388 source "arch/powerpc/sysdev/Kconfig"
389 source "arch/powerpc/platforms/Kconfig"
391 menu "Kernel options"
394 bool "High memory support"
397 source kernel/Kconfig.hz
398 source kernel/Kconfig.preempt
399 source "fs/Kconfig.binfmt"
401 config HUGETLB_PAGE_SIZE_VARIABLE
403 depends on HUGETLB_PAGE
406 config MATH_EMULATION
407 bool "Math emulation"
408 depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
410 Some PowerPC chips designed for embedded applications do not have
411 a floating-point unit and therefore do not implement the
412 floating-point instructions in the PowerPC instruction set. If you
413 say Y here, the kernel will include code to emulate a floating-point
414 unit, which will allow programs that use floating-point
417 This is also useful to emulate missing (optional) instructions
418 such as fsqrt on cores that do have an FPU but do not implement
419 them (such as Freescale BookE).
422 prompt "Math emulation options"
423 default MATH_EMULATION_FULL
424 depends on MATH_EMULATION
426 config MATH_EMULATION_FULL
427 bool "Emulate all the floating point instructions"
429 Select this option will enable the kernel to support to emulate
430 all the floating point instructions. If your SoC doesn't have
431 a FPU, you should select this.
433 config MATH_EMULATION_HW_UNIMPLEMENTED
434 bool "Just emulate the FPU unimplemented instructions"
436 Select this if you know there does have a hardware FPU on your
437 SoC, but some floating point instructions are not implemented by that.
441 config PPC_TRANSACTIONAL_MEM
442 bool "Transactional Memory support for POWERPC"
443 depends on PPC_BOOK3S_64
449 Support user-mode Transactional Memory on POWERPC.
451 config LD_HEAD_STUB_CATCH
452 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
456 Very large kernels can cause linker branch stubs to be generated by
457 code in head_64.S, which moves the head text sections out of their
458 specified location. This option can work around the problem.
462 config MPROFILE_KERNEL
463 depends on PPC64 && CPU_LITTLE_ENDIAN
464 def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)
467 bool "Support for enabling/disabling CPUs"
468 depends on SMP && (PPC_PSERIES || \
469 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
471 Say Y here to be able to disable and re-enable individual
472 CPUs at runtime on SMP machines.
474 Say N if you are unsure.
476 config ARCH_CPU_PROBE_RELEASE
478 depends on HOTPLUG_CPU
480 config ARCH_ENABLE_MEMORY_HOTPLUG
483 config ARCH_HAS_WALK_MEMORY
486 config ARCH_ENABLE_MEMORY_HOTREMOVE
489 config PPC64_SUPPORTS_MEMORY_FAILURE
490 bool "Add support for memory hwpoison"
491 depends on PPC_BOOK3S_64
492 default "y" if PPC_POWERNV
493 select ARCH_SUPPORTS_MEMORY_FAILURE
496 bool "kexec system call"
497 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
500 kexec is a system call that implements the ability to shutdown your
501 current kernel, and to start another kernel. It is like a reboot
502 but it is independent of the system firmware. And like a reboot
503 you can start any kernel with it, not just Linux.
505 The name comes from the similarity to the exec system call.
507 It is an ongoing process to be certain the hardware in a machine
508 is properly shutdown, so do not be surprised if this code does not
509 initially work for you. As of this writing the exact hardware
510 interface is strongly in flux, so no good recommendation can be
514 bool "kexec file based system call"
516 select HAVE_IMA_KEXEC
520 depends on CRYPTO_SHA256=y
522 This is a new version of the kexec system call. This call is
523 file based and takes in file descriptors as system call arguments
524 for kernel and initramfs as opposed to a list of segments as is the
525 case for the older kexec call.
527 config ARCH_HAS_KEXEC_PURGATORY
531 bool "Build a relocatable kernel"
532 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
533 select NONSTATIC_KERNEL
534 select MODULE_REL_CRCS if MODVERSIONS
536 This builds a kernel image that is capable of running at the
537 location the kernel is loaded at. For ppc32, there is no any
538 alignment restrictions, and this feature is a superset of
539 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
540 16k-aligned base address. The kernel is linked as a
541 position-independent executable (PIE) and contains dynamic relocations
542 which are processed early in the bootup process.
544 One use is for the kexec on panic case where the recovery kernel
545 must live at a different physical address than the primary
548 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
549 it has been loaded at and the compile time physical addresses
550 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
551 setting can still be useful to bootwrappers that need to know the
552 load address of the kernel (eg. u-boot/mkimage).
554 config RELOCATABLE_TEST
555 bool "Test relocatable kernel"
556 depends on (PPC64 && RELOCATABLE)
559 This runs the relocatable kernel at the address it was initially
560 loaded at, which tends to be non-zero and therefore test the
564 bool "Build a dump capture kernel"
565 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
566 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
568 Build a kernel suitable for use as a dump capture kernel.
569 The same kernel binary can be used as production kernel and dump
573 bool "Firmware-assisted dump"
574 depends on PPC64 && PPC_RTAS
578 A robust mechanism to get reliable kernel crash dump with
579 assistance from firmware. This approach does not use kexec,
580 instead firmware assists in booting the capture kernel
581 while preserving memory contents. Firmware-assisted dump
582 is meant to be a kdump replacement offering robustness and
583 speed not possible without system firmware assistance.
588 bool "Distribute interrupts on all CPUs by default"
591 This option gives the kernel permission to distribute IRQs across
592 multiple CPUs. Saying N here will route all IRQs to the first
593 CPU. Generally saying Y is safe, although some problems have been
594 reported with SMP Power Macintoshes with this option enabled.
599 default y if SMP && PPC_PSERIES
605 depends on NEED_MULTIPLE_NODES
607 config USE_PERCPU_NUMA_NODE_ID
611 config HAVE_MEMORYLESS_NODES
615 config ARCH_SELECT_MEMORY_MODEL
619 config ARCH_FLATMEM_ENABLE
621 depends on (PPC64 && !NUMA) || PPC32
623 config ARCH_SPARSEMEM_ENABLE
626 select SPARSEMEM_VMEMMAP_ENABLE
628 config ARCH_SPARSEMEM_DEFAULT
630 depends on PPC_BOOK3S_64
632 config SYS_SUPPORTS_HUGETLBFS
635 config ILLEGAL_POINTER_VALUE
637 # This is roughly half way between the top of user space and the bottom
638 # of kernel space, which seems about as good as we can get.
639 default 0x5deadbeef0000000 if PPC64
644 config ARCH_MEMORY_PROBE
646 depends on MEMORY_HOTPLUG
648 # Some NUMA nodes have memory ranges that span
649 # other nodes. Even though a pfn is valid and
650 # between a node's start and end pfns, it may not
651 # reside on that node. See memmap_init_zone()
653 config NODES_SPAN_OTHER_NODES
655 depends on NEED_MULTIPLE_NODES
658 bool "Using standard binutils settings"
662 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
663 Note, that kernel will be able to run only those applications,
664 which had been compiled using binutils later than 2.17.50.0.3 with
665 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
666 the older binutils, you can patch them with a trivial patch, which
667 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
673 Select the kernel logical page size. Increasing the page size
674 will reduce software overhead at each page boundary, allow
675 hardware prefetch mechanisms to be more effective, and allow
676 larger dma transfers increasing IO efficiency and reducing
677 overhead. However the utilization of memory will increase.
678 For example, each cached file will using a multiple of the
679 page size to hold its contents and the difference between the
680 end of file and the end of page is wasted.
682 Some dedicated systems, such as software raid serving with
683 accelerated calculations, have shown significant increases.
685 If you configure a 64 bit kernel for 64k pages but the
686 processor does not support them, then the kernel will simulate
687 them with 4k pages, loading them on demand, but with the
688 reduced software overhead and larger internal fragmentation.
689 For the 32 bit kernel, a large page option will not be offered
690 unless it is supported by the configured processor.
692 If unsure, choose 4K_PAGES.
696 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
700 depends on 44x || PPC_8xx
704 depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
705 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
707 config PPC_256K_PAGES
708 bool "256k page size"
709 depends on 44x && !STDBINUTILS
711 Make the page size 256k.
713 As the ELF standard only requires alignment to support page
714 sizes up to 64k, you will need to compile all of your user
715 space applications with a non-standard binutils settings
716 (see the STDBINUTILS description for details).
718 Say N unless you know what you are doing.
723 int "Thread shift" if EXPERT
725 default "15" if PPC_256K_PAGES
726 default "14" if PPC64
729 Used to define the stack size. The default is almost always what you
730 want. Only change this if you know what you are doing.
732 config FORCE_MAX_ZONEORDER
733 int "Maximum zone order"
734 range 8 9 if PPC64 && PPC_64K_PAGES
735 default "9" if PPC64 && PPC_64K_PAGES
736 range 13 13 if PPC64 && !PPC_64K_PAGES
737 default "13" if PPC64 && !PPC_64K_PAGES
738 range 9 64 if PPC32 && PPC_16K_PAGES
739 default "9" if PPC32 && PPC_16K_PAGES
740 range 7 64 if PPC32 && PPC_64K_PAGES
741 default "7" if PPC32 && PPC_64K_PAGES
742 range 5 64 if PPC32 && PPC_256K_PAGES
743 default "5" if PPC32 && PPC_256K_PAGES
747 The kernel memory allocator divides physically contiguous memory
748 blocks into "zones", where each zone is a power of two number of
749 pages. This option selects the largest power of two that the kernel
750 keeps in the memory allocator. If you need to allocate very large
751 blocks of physically contiguous memory, then you may need to
754 This config option is actually maximum order plus one. For example,
755 a value of 11 means that the largest free memory block is 2^10 pages.
757 The page size is not necessarily 4KB. For example, on 64-bit
758 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
759 this in mind when choosing a value for this option.
761 config PPC_SUBPAGE_PROT
762 bool "Support setting protections for 4k subpages"
763 depends on PPC_BOOK3S_64 && PPC_64K_PAGES
765 This option adds support for a system call to allow user programs
766 to set access permissions (read/write, readonly, or no access)
767 on the 4k subpages of each 64k page.
769 config PPC_COPRO_BASE
774 bool "SMT (Hyperthreading) scheduler support"
775 depends on PPC64 && SMP
777 SMT scheduler support improves the CPU scheduler's decision making
778 when dealing with POWER5 cpus at a cost of slightly increased
779 overhead in some places. If unsure say N here.
781 config PPC_DENORMALISATION
782 bool "PowerPC denormalisation exception handling"
783 depends on PPC_BOOK3S_64
784 default "y" if PPC_POWERNV
786 Add support for handling denormalisation of single precision
787 values. Useful for bare metal only. If unsure say Y here.
790 bool "Default bootloader kernel arguments"
793 string "Initial kernel command string"
794 depends on CMDLINE_BOOL
795 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
797 On some platforms, there is currently no way for the boot loader to
798 pass arguments to the kernel. For these platforms, you can supply
799 some command-line options at build time by entering them here. In
800 most cases you will need to specify the root device here.
803 bool "Always use the default kernel command string"
804 depends on CMDLINE_BOOL
806 Always use the default kernel command string, even if the boot
807 loader passes other arguments to the kernel.
808 This is useful if you cannot or don't want to change the
809 command-line options your boot loader passes to the kernel.
812 string "Additional default image types"
814 List additional targets to be built by the bootwrapper here (separated
815 by spaces). This is useful for targets that depend of device tree
816 files in the .dts directory.
818 Targets in this list will be build as part of the default build
819 target, or when the user does a 'make zImage' or a
820 'make zImage.initrd'.
822 If unsure, leave blank
824 config ARCH_WANTS_FREEZER_CONTROL
828 source kernel/power/Kconfig
831 bool "Enable seccomp to safely compute untrusted bytecode"
835 This kernel feature is useful for number crunching applications
836 that may need to compute untrusted bytecode during their
837 execution. By using pipes or other transports made available to
838 the process as file descriptors supporting the read/write
839 syscalls, it's possible to isolate those applications in
840 their own address space using seccomp. Once seccomp is
841 enabled via /proc/<pid>/seccomp, it cannot be disabled
842 and the task is only allowed to execute a few safe syscalls
843 defined by each seccomp mode.
845 If unsure, say Y. Only embedded should say N here.
848 prompt "PowerPC Memory Protection Keys"
850 depends on PPC_BOOK3S_64
851 select ARCH_USES_HIGH_VMA_FLAGS
852 select ARCH_HAS_PKEYS
854 Memory Protection Keys provides a mechanism for enforcing
855 page-based protections, but without requiring modification of the
856 page tables when an application changes protection domains.
858 For details, see Documentation/vm/protection-keys.rst
871 bool "Support for ISA-bus hardware"
875 Find out whether you have ISA slots on your motherboard. ISA is the
876 name of a bus system, i.e. the way the CPU talks to the other stuff
877 inside your box. If you have an Apple machine, say N here; if you
878 have an IBM RS/6000 or pSeries machine, say Y. If you have an
879 embedded board, consult your board documentation.
885 config NEED_DMA_MAP_STATE
886 def_bool (PPC64 || NOT_COHERENT_CACHE)
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 && !PPC_8xx && !PPC_83xx \
959 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
960 default PCI_QSPAN if PPC_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.
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 && PPC_8xx && \
1168 !DEBUG_PAGEALLOC && !STRICT_KERNEL_RWX
1171 bool "Pinned TLB for DATA"
1176 bool "Pinned TLB for IMMR"
1181 bool "Pinned TLB for TEXT"
1187 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1190 default "0xc000000000000000"
1193 default "0xc000000000000000"
1194 config PHYSICAL_START
1196 default "0x00000000"
1202 source "net/Kconfig"
1204 source "drivers/Kconfig"
1208 source "lib/Kconfig"
1210 source "arch/powerpc/Kconfig.debug"
1212 source "security/Kconfig"
1214 source "crypto/Kconfig"
1216 config PPC_LIB_RHEAP
1219 source "arch/powerpc/kvm/Kconfig"
1221 source "kernel/livepatch/Kconfig"