Merge tag 'fs.mount.propagation.fix.v6.2-rc1' of git://git.kernel.org/pub/scm/linux...

[linux-2.6-microblaze.git] / arch / powerpc / Kconfig

# SPDX-License-Identifier: GPL-2.0
source "arch/powerpc/platforms/Kconfig.cputype"

config CC_HAS_ELFV2
        def_bool PPC64 && $(cc-option, -mabi=elfv2)

config 32BIT
        bool
        default y if PPC32

config 64BIT
        bool
        default y if PPC64

config LIVEPATCH_64
        def_bool PPC64
        depends on LIVEPATCH

config MMU
        bool
        default y

config ARCH_MMAP_RND_BITS_MAX
        # On Book3S 64, the default virtual address space for 64-bit processes
        # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
        # 32T of address space (2^45), which should ensure a reasonable gap
        # between bottom-up and top-down allocations for applications that
        # consume "normal" amounts of address space. Book3S 64 only supports 64K
        # and 4K page sizes.
        default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
        default 33 if PPC_BOOK3S_64                  # 33 = 45 (32T) - 12 (4K)
        #
        # On all other 64-bit platforms (currently only Book3E), the virtual
        # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
        # of address space (2^44). Only 4K page sizes are supported.
        default 32 if 64BIT     # 32 = 44 (16T) - 12 (4K)
        #
        # For 32-bit, use the compat values, as they're the same.
        default ARCH_MMAP_RND_COMPAT_BITS_MAX

config ARCH_MMAP_RND_BITS_MIN
        # Allow randomisation to consume up to 1GB of address space (2^30).
        default 14 if 64BIT && PPC_64K_PAGES    # 14 = 30 (1GB) - 16 (64K)
        default 18 if 64BIT                     # 18 = 30 (1GB) - 12 (4K)
        #
        # For 32-bit, use the compat values, as they're the same.
        default ARCH_MMAP_RND_COMPAT_BITS_MIN

config ARCH_MMAP_RND_COMPAT_BITS_MAX
        # Total virtual address space for 32-bit processes is 2^31 (2GB).
        # Allow randomisation to consume up to 512MB of address space (2^29).
        default 11 if PPC_256K_PAGES    # 11 = 29 (512MB) - 18 (256K)
        default 13 if PPC_64K_PAGES     # 13 = 29 (512MB) - 16 (64K)
        default 15 if PPC_16K_PAGES     # 15 = 29 (512MB) - 14 (16K)
        default 17                      # 17 = 29 (512MB) - 12 (4K)

config ARCH_MMAP_RND_COMPAT_BITS_MIN
        # Total virtual address space for 32-bit processes is 2^31 (2GB).
        # Allow randomisation to consume up to 8MB of address space (2^23).
        default 5 if PPC_256K_PAGES     #  5 = 23 (8MB) - 18 (256K)
        default 7 if PPC_64K_PAGES      #  7 = 23 (8MB) - 16 (64K)
        default 9 if PPC_16K_PAGES      #  9 = 23 (8MB) - 14 (16K)
        default 11                      # 11 = 23 (8MB) - 12 (4K)

config NR_IRQS
        int "Number of virtual interrupt numbers"
        range 32 1048576
        default "512"
        help
          This defines the number of virtual interrupt numbers the kernel
          can manage. Virtual interrupt numbers are what you see in
          /proc/interrupts. If you configure your system to have too few,
          drivers will fail to load or worse - handle with care.

config NMI_IPI
        bool
        depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
        default y

config PPC_WATCHDOG
        bool
        depends on HARDLOCKUP_DETECTOR
        depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
        default y
        help
          This is a placeholder when the powerpc hardlockup detector
          watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
          selected via the generic lockup detector menu which is why we
          have no standalone config option for it here.

config STACKTRACE_SUPPORT
        bool
        default y

config LOCKDEP_SUPPORT
        bool
        default y

config GENERIC_LOCKBREAK
        bool
        default y
        depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS

config GENERIC_HWEIGHT
        bool
        default y

config PPC
        bool
        default y
        #
        # Please keep this list sorted alphabetically.
        #
        select ARCH_32BIT_OFF_T if PPC32
        select ARCH_DISABLE_KASAN_INLINE        if PPC_RADIX_MMU
        select ARCH_ENABLE_MEMORY_HOTPLUG
        select ARCH_ENABLE_MEMORY_HOTREMOVE
        select ARCH_HAS_COPY_MC                 if PPC64
        select ARCH_HAS_CURRENT_STACK_POINTER
        select ARCH_HAS_DEBUG_VIRTUAL
        select ARCH_HAS_DEBUG_VM_PGTABLE
        select ARCH_HAS_DEBUG_WX                if STRICT_KERNEL_RWX
        select ARCH_HAS_DEVMEM_IS_ALLOWED
        select ARCH_HAS_DMA_MAP_DIRECT          if PPC_PSERIES
        select ARCH_HAS_FORTIFY_SOURCE
        select ARCH_HAS_GCOV_PROFILE_ALL
        select ARCH_HAS_HUGEPD                  if HUGETLB_PAGE
        select ARCH_HAS_KCOV
        select ARCH_HAS_MEMBARRIER_CALLBACKS
        select ARCH_HAS_MEMBARRIER_SYNC_CORE
        select ARCH_HAS_MEMREMAP_COMPAT_ALIGN   if PPC_64S_HASH_MMU
        select ARCH_HAS_MMIOWB                  if PPC64
        select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
        select ARCH_HAS_PHYS_TO_DMA
        select ARCH_HAS_PMEM_API
        select ARCH_HAS_PTE_DEVMAP              if PPC_BOOK3S_64
        select ARCH_HAS_PTE_SPECIAL
        select ARCH_HAS_SCALED_CPUTIME          if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
        select ARCH_HAS_SET_MEMORY
        select ARCH_HAS_STRICT_KERNEL_RWX       if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
        select ARCH_HAS_STRICT_KERNEL_RWX       if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE
        select ARCH_HAS_STRICT_MODULE_RWX       if ARCH_HAS_STRICT_KERNEL_RWX
        select ARCH_HAS_SYSCALL_WRAPPER         if !SPU_BASE && !COMPAT
        select ARCH_HAS_TICK_BROADCAST          if GENERIC_CLOCKEVENTS_BROADCAST
        select ARCH_HAS_UACCESS_FLUSHCACHE
        select ARCH_HAS_UBSAN_SANITIZE_ALL
        select ARCH_HAVE_NMI_SAFE_CMPXCHG
        select ARCH_KEEP_MEMBLOCK
        select ARCH_MIGHT_HAVE_PC_PARPORT
        select ARCH_MIGHT_HAVE_PC_SERIO
        select ARCH_OPTIONAL_KERNEL_RWX         if ARCH_HAS_STRICT_KERNEL_RWX
        select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
        select ARCH_SPLIT_ARG64                 if PPC32
        select ARCH_STACKWALK
        select ARCH_SUPPORTS_ATOMIC_RMW
        select ARCH_SUPPORTS_DEBUG_PAGEALLOC    if PPC_BOOK3S || PPC_8xx || 40x
        select ARCH_USE_BUILTIN_BSWAP
        select ARCH_USE_CMPXCHG_LOCKREF         if PPC64
        select ARCH_USE_MEMTEST
        select ARCH_USE_QUEUED_RWLOCKS          if PPC_QUEUED_SPINLOCKS
        select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
        select ARCH_WANT_IPC_PARSE_VERSION
        select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
        select ARCH_WANT_LD_ORPHAN_WARN
        select ARCH_WANTS_MODULES_DATA_IN_VMALLOC       if PPC_BOOK3S_32 || PPC_8xx
        select ARCH_WANTS_NO_INSTR
        select ARCH_WEAK_RELEASE_ACQUIRE
        select BINFMT_ELF
        select BUILDTIME_TABLE_SORT
        select CLONE_BACKWARDS
        select CPUMASK_OFFSTACK                 if NR_CPUS >= 8192
        select DCACHE_WORD_ACCESS               if PPC64 && CPU_LITTLE_ENDIAN
        select DMA_OPS_BYPASS                   if PPC64
        select DMA_OPS                          if PPC64
        select DYNAMIC_FTRACE                   if FUNCTION_TRACER
        select EDAC_ATOMIC_SCRUB
        select EDAC_SUPPORT
        select GENERIC_ATOMIC64                 if PPC32
        select GENERIC_CLOCKEVENTS_BROADCAST    if SMP
        select GENERIC_CMOS_UPDATE
        select GENERIC_CPU_AUTOPROBE
        select GENERIC_CPU_VULNERABILITIES      if PPC_BARRIER_NOSPEC
        select GENERIC_EARLY_IOREMAP
        select GENERIC_GETTIMEOFDAY
        select GENERIC_IRQ_SHOW
        select GENERIC_IRQ_SHOW_LEVEL
        select GENERIC_PCI_IOMAP                if PCI
        select GENERIC_PTDUMP
        select GENERIC_SMP_IDLE_THREAD
        select GENERIC_TIME_VSYSCALL
        select GENERIC_VDSO_TIME_NS
        select HAVE_ARCH_AUDITSYSCALL
        select HAVE_ARCH_HUGE_VMALLOC           if HAVE_ARCH_HUGE_VMAP
        select HAVE_ARCH_HUGE_VMAP              if PPC_RADIX_MMU || PPC_8xx
        select HAVE_ARCH_JUMP_LABEL
        select HAVE_ARCH_JUMP_LABEL_RELATIVE
        select HAVE_ARCH_KASAN                  if PPC32 && PPC_PAGE_SHIFT <= 14
        select HAVE_ARCH_KASAN                  if PPC_RADIX_MMU
        select HAVE_ARCH_KASAN                  if PPC_BOOK3E_64
        select HAVE_ARCH_KASAN_VMALLOC          if HAVE_ARCH_KASAN
        select HAVE_ARCH_KFENCE                 if ARCH_SUPPORTS_DEBUG_PAGEALLOC
        select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
        select HAVE_ARCH_KGDB
        select HAVE_ARCH_MMAP_RND_BITS
        select HAVE_ARCH_MMAP_RND_COMPAT_BITS   if COMPAT
        select HAVE_ARCH_NVRAM_OPS
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_ARCH_TRACEHOOK
        select HAVE_ASM_MODVERSIONS
        select HAVE_CONTEXT_TRACKING_USER               if PPC64
        select HAVE_C_RECORDMCOUNT
        select HAVE_DEBUG_KMEMLEAK
        select HAVE_DEBUG_STACKOVERFLOW
        select HAVE_DYNAMIC_FTRACE
        select HAVE_DYNAMIC_FTRACE_WITH_ARGS    if MPROFILE_KERNEL || PPC32
        select HAVE_DYNAMIC_FTRACE_WITH_REGS    if MPROFILE_KERNEL || PPC32
        select HAVE_EBPF_JIT
        select HAVE_EFFICIENT_UNALIGNED_ACCESS
        select HAVE_FAST_GUP
        select HAVE_FTRACE_MCOUNT_RECORD
        select HAVE_FUNCTION_DESCRIPTORS        if PPC64_ELF_ABI_V1
        select HAVE_FUNCTION_ERROR_INJECTION
        select HAVE_FUNCTION_GRAPH_TRACER
        select HAVE_FUNCTION_TRACER
        select HAVE_GCC_PLUGINS                 if GCC_VERSION >= 50200   # plugin support on gcc <= 5.1 is buggy on PPC
        select HAVE_GENERIC_VDSO
        select HAVE_HARDLOCKUP_DETECTOR_ARCH    if PPC_BOOK3S_64 && SMP
        select HAVE_HARDLOCKUP_DETECTOR_PERF    if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
        select HAVE_HW_BREAKPOINT               if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
        select HAVE_IOREMAP_PROT
        select HAVE_IRQ_TIME_ACCOUNTING
        select HAVE_KERNEL_GZIP
        select HAVE_KERNEL_LZMA                 if DEFAULT_UIMAGE
        select HAVE_KERNEL_LZO                  if DEFAULT_UIMAGE
        select HAVE_KERNEL_XZ                   if PPC_BOOK3S || 44x
        select HAVE_KPROBES
        select HAVE_KPROBES_ON_FTRACE
        select HAVE_KRETPROBES
        select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
        select HAVE_LIVEPATCH                   if HAVE_DYNAMIC_FTRACE_WITH_REGS
        select HAVE_MOD_ARCH_SPECIFIC
        select HAVE_NMI                         if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
        select HAVE_OPTPROBES
        select HAVE_OBJTOOL                     if PPC32 || MPROFILE_KERNEL
        select HAVE_OBJTOOL_MCOUNT              if HAVE_OBJTOOL
        select HAVE_PERF_EVENTS
        select HAVE_PERF_EVENTS_NMI             if PPC64
        select HAVE_PERF_REGS
        select HAVE_PERF_USER_STACK_DUMP
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_RELIABLE_STACKTRACE
        select HAVE_RSEQ
        select HAVE_SETUP_PER_CPU_AREA          if PPC64
        select HAVE_SOFTIRQ_ON_OWN_STACK
        select HAVE_STACKPROTECTOR              if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
        select HAVE_STACKPROTECTOR              if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
        select HAVE_STATIC_CALL                 if PPC32
        select HAVE_SYSCALL_TRACEPOINTS
        select HAVE_VIRT_CPU_ACCOUNTING
        select HUGETLB_PAGE_SIZE_VARIABLE       if PPC_BOOK3S_64 && HUGETLB_PAGE
        select IOMMU_HELPER                     if PPC64
        select IRQ_DOMAIN
        select IRQ_FORCED_THREADING
        select KASAN_VMALLOC                    if KASAN && MODULES
        select MMU_GATHER_PAGE_SIZE
        select MMU_GATHER_RCU_TABLE_FREE
        select MMU_GATHER_MERGE_VMAS
        select MODULES_USE_ELF_RELA
        select NEED_DMA_MAP_STATE               if PPC64 || NOT_COHERENT_CACHE
        select NEED_PER_CPU_EMBED_FIRST_CHUNK   if PPC64
        select NEED_PER_CPU_PAGE_FIRST_CHUNK    if PPC64
        select NEED_SG_DMA_LENGTH
        select OF
        select OF_DMA_DEFAULT_COHERENT          if !NOT_COHERENT_CACHE
        select OF_EARLY_FLATTREE
        select OLD_SIGACTION                    if PPC32
        select OLD_SIGSUSPEND
        select PCI_DOMAINS                      if PCI
        select PCI_MSI_ARCH_FALLBACKS           if PCI_MSI
        select PCI_SYSCALL                      if PCI
        select PPC_DAWR                         if PPC64
        select RTC_LIB
        select SPARSE_IRQ
        select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
        select SYSCTL_EXCEPTION_TRACE
        select THREAD_INFO_IN_TASK
        select TRACE_IRQFLAGS_SUPPORT
        #
        # Please keep this list sorted alphabetically.
        #

config PPC_LONG_DOUBLE_128
        depends on PPC64 && ALTIVEC
        def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)

config PPC_BARRIER_NOSPEC
        bool
        default y
        depends on PPC_BOOK3S_64 || PPC_E500

config PPC_HAS_LBARX_LHARX
        bool

config EARLY_PRINTK
        bool
        default y

config PANIC_TIMEOUT
        int
        default 180

config COMPAT
        bool "Enable support for 32bit binaries"
        depends on PPC64
        depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
        default y if !CPU_LITTLE_ENDIAN
        select ARCH_WANT_OLD_COMPAT_IPC
        select COMPAT_OLD_SIGACTION

config SCHED_OMIT_FRAME_POINTER
        bool
        default y

config ARCH_MAY_HAVE_PC_FDC
        bool
        default PCI

config PPC_UDBG_16550
        bool

config GENERIC_TBSYNC
        bool
        default y if PPC32 && SMP

config AUDIT_ARCH
        bool
        default y

config GENERIC_BUG
        bool
        default y
        depends on BUG

config GENERIC_BUG_RELATIVE_POINTERS
        def_bool y
        depends on GENERIC_BUG

config SYS_SUPPORTS_APM_EMULATION
        default y if PMAC_APM_EMU
        bool

config EPAPR_BOOT
        bool
        help
          Used to allow a board to specify it wants an ePAPR compliant wrapper.

config DEFAULT_UIMAGE
        bool
        help
          Used to allow a board to specify it wants a uImage built by default

config ARCH_HIBERNATION_POSSIBLE
        bool
        default y

config ARCH_SUSPEND_POSSIBLE
        def_bool y
        depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
                   (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
                   || 44x || 40x

config ARCH_SUSPEND_NONZERO_CPU
        def_bool y
        depends on PPC_POWERNV || PPC_PSERIES

config ARCH_HAS_ADD_PAGES
        def_bool y
        depends on ARCH_ENABLE_MEMORY_HOTPLUG

config PPC_DCR_NATIVE
        bool

config PPC_DCR_MMIO
        bool

config PPC_DCR
        bool
        depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
        default y

config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
        depends on PPC32
        depends on !PPC_PMAC && !PPC_CHRP
        bool "Assign PCI bus numbers from zero individually for each PCI domain"
        help
          By default on PPC32 were PCI bus numbers unique across all PCI domains.
          So system could have only 256 PCI buses independently of available
          PCI domains. When this option is enabled then PCI bus numbers are
          PCI domain dependent and each PCI controller on own domain can have
          256 PCI buses, like it is on other Linux architectures.

config PPC_OF_PLATFORM_PCI
        bool
        depends on PCI
        depends on PPC64 # not supported on 32 bits yet

config ARCH_SUPPORTS_UPROBES
        def_bool y

config PPC_ADV_DEBUG_REGS
        bool
        depends on 40x || BOOKE
        default y

config PPC_ADV_DEBUG_IACS
        int
        depends on PPC_ADV_DEBUG_REGS
        default 4 if 44x
        default 2

config PPC_ADV_DEBUG_DACS
        int
        depends on PPC_ADV_DEBUG_REGS
        default 2

config PPC_ADV_DEBUG_DVCS
        int
        depends on PPC_ADV_DEBUG_REGS
        default 2 if 44x
        default 0

config PPC_ADV_DEBUG_DAC_RANGE
        bool
        depends on PPC_ADV_DEBUG_REGS && 44x
        default y

config PPC_DAWR
        bool

config PGTABLE_LEVELS
        int
        default 2 if !PPC64
        default 4

source "arch/powerpc/sysdev/Kconfig"
source "arch/powerpc/platforms/Kconfig"

menu "Kernel options"

config HIGHMEM
        bool "High memory support"
        depends on PPC32
        select KMAP_LOCAL

source "kernel/Kconfig.hz"

config MATH_EMULATION
        bool "Math emulation"
        depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE || PPC_MICROWATT
        select PPC_FPU_REGS
        help
          Some PowerPC chips designed for embedded applications do not have
          a floating-point unit and therefore do not implement the
          floating-point instructions in the PowerPC instruction set.  If you
          say Y here, the kernel will include code to emulate a floating-point
          unit, which will allow programs that use floating-point
          instructions to run.

          This is also useful to emulate missing (optional) instructions
          such as fsqrt on cores that do have an FPU but do not implement
          them (such as Freescale BookE).

choice
        prompt "Math emulation options"
        default MATH_EMULATION_FULL
        depends on MATH_EMULATION

config MATH_EMULATION_FULL
        bool "Emulate all the floating point instructions"
        help
          Select this option will enable the kernel to support to emulate
          all the floating point instructions. If your SoC doesn't have
          a FPU, you should select this.

config MATH_EMULATION_HW_UNIMPLEMENTED
        bool "Just emulate the FPU unimplemented instructions"
        help
          Select this if you know there does have a hardware FPU on your
          SoC, but some floating point instructions are not implemented by that.

endchoice

config PPC_TRANSACTIONAL_MEM
        bool "Transactional Memory support for POWERPC"
        depends on PPC_BOOK3S_64
        depends on SMP
        select ALTIVEC
        select VSX
        help
          Support user-mode Transactional Memory on POWERPC.

config PPC_UV
        bool "Ultravisor support"
        depends on KVM_BOOK3S_HV_POSSIBLE
        depends on DEVICE_PRIVATE
        default n
        help
          This option paravirtualizes the kernel to run in POWER platforms that
          supports the Protected Execution Facility (PEF). On such platforms,
          the ultravisor firmware runs at a privilege level above the
          hypervisor.

          If unsure, say "N".

config LD_HEAD_STUB_CATCH
        bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
        depends on PPC64
        help
          Very large kernels can cause linker branch stubs to be generated by
          code in head_64.S, which moves the head text sections out of their
          specified location. This option can work around the problem.

          If unsure, say "N".

config MPROFILE_KERNEL
        depends on PPC64 && CPU_LITTLE_ENDIAN && FUNCTION_TRACER
        def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__)

config HOTPLUG_CPU
        bool "Support for enabling/disabling CPUs"
        depends on SMP && (PPC_PSERIES || \
                PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
        help
          Say Y here to be able to disable and re-enable individual
          CPUs at runtime on SMP machines.

          Say N if you are unsure.

config INTERRUPT_SANITIZE_REGISTERS
        bool "Clear gprs on interrupt arrival"
        depends on PPC64 && ARCH_HAS_SYSCALL_WRAPPER
        default PPC_BOOK3E_64 || PPC_PSERIES || PPC_POWERNV
        help
          Reduce the influence of user register state on interrupt handlers and
          syscalls through clearing user state from registers before handling
          the exception.

config PPC_QUEUED_SPINLOCKS
        bool "Queued spinlocks" if EXPERT
        depends on SMP
        default PPC_BOOK3S_64
        help
          Say Y here to use queued spinlocks which give better scalability and
          fairness on large SMP and NUMA systems without harming single threaded
          performance.

config ARCH_CPU_PROBE_RELEASE
        def_bool y
        depends on HOTPLUG_CPU

config PPC64_SUPPORTS_MEMORY_FAILURE
        bool "Add support for memory hwpoison"
        depends on PPC_BOOK3S_64
        default "y" if PPC_POWERNV
        select ARCH_SUPPORTS_MEMORY_FAILURE

config KEXEC
        bool "kexec system call"
        depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP)
        select KEXEC_CORE
        help
          kexec is a system call that implements the ability to shutdown your
          current kernel, and to start another kernel.  It is like a reboot
          but it is independent of the system firmware.   And like a reboot
          you can start any kernel with it, not just Linux.

          The name comes from the similarity to the exec system call.

          It is an ongoing process to be certain the hardware in a machine
          is properly shutdown, so do not be surprised if this code does not
          initially work for you.  As of this writing the exact hardware
          interface is strongly in flux, so no good recommendation can be
          made.

config KEXEC_FILE
        bool "kexec file based system call"
        select KEXEC_CORE
        select HAVE_IMA_KEXEC if IMA
        select KEXEC_ELF
        depends on PPC64
        depends on CRYPTO=y
        depends on CRYPTO_SHA256=y
        help
          This is a new version of the kexec system call. This call is
          file based and takes in file descriptors as system call arguments
          for kernel and initramfs as opposed to a list of segments as is the
          case for the older kexec call.

config ARCH_HAS_KEXEC_PURGATORY
        def_bool KEXEC_FILE

config PPC64_BIG_ENDIAN_ELF_ABI_V2
        bool "Build big-endian kernel using ELF ABI V2 (EXPERIMENTAL)"
        depends on PPC64 && CPU_BIG_ENDIAN
        depends on CC_HAS_ELFV2
        depends on LD_IS_BFD && LD_VERSION >= 22400
        default n
        help
          This builds the kernel image using the "Power Architecture 64-Bit ELF
          V2 ABI Specification", which has a reduced stack overhead and faster
          function calls. This internal kernel ABI option does not affect
          userspace compatibility.

          The V2 ABI is standard for 64-bit little-endian, but for big-endian
          it is less well tested by kernel and toolchain. However some distros
          build userspace this way, and it can produce a functioning kernel.

          This requires GCC and binutils 2.24 or newer.

config RELOCATABLE
        bool "Build a relocatable kernel"
        depends on PPC64 || (FLATMEM && (44x || PPC_85xx))
        select NONSTATIC_KERNEL
        help
          This builds a kernel image that is capable of running at the
          location the kernel is loaded at. For ppc32, there is no any
          alignment restrictions, and this feature is a superset of
          DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
          16k-aligned base address. The kernel is linked as a
          position-independent executable (PIE) and contains dynamic relocations
          which are processed early in the bootup process.

          One use is for the kexec on panic case where the recovery kernel
          must live at a different physical address than the primary
          kernel.

          Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
          it has been loaded at and the compile time physical addresses
          CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
          setting can still be useful to bootwrappers that need to know the
          load address of the kernel (eg. u-boot/mkimage).

config RANDOMIZE_BASE
        bool "Randomize the address of the kernel image"
        depends on PPC_85xx && FLATMEM
        depends on RELOCATABLE
        help
          Randomizes the virtual address at which the kernel image is
          loaded, as a security feature that deters exploit attempts
          relying on knowledge of the location of kernel internals.

          If unsure, say Y.

config RELOCATABLE_TEST
        bool "Test relocatable kernel"
        depends on (PPC64 && RELOCATABLE)
        help
          This runs the relocatable kernel at the address it was initially
          loaded at, which tends to be non-zero and therefore test the
          relocation code.

config CRASH_DUMP
        bool "Build a dump capture kernel"
        depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
        select RELOCATABLE if PPC64 || 44x || PPC_85xx
        help
          Build a kernel suitable for use as a dump capture kernel.
          The same kernel binary can be used as production kernel and dump
          capture kernel.

config FA_DUMP
        bool "Firmware-assisted dump"
        depends on PPC64 && (PPC_RTAS || PPC_POWERNV)
        select CRASH_CORE
        select CRASH_DUMP
        help
          A robust mechanism to get reliable kernel crash dump with
          assistance from firmware. This approach does not use kexec,
          instead firmware assists in booting the capture kernel
          while preserving memory contents. Firmware-assisted dump
          is meant to be a kdump replacement offering robustness and
          speed not possible without system firmware assistance.

          If unsure, say "y". Only special kernels like petitboot may
          need to say "N" here.

config PRESERVE_FA_DUMP
        bool "Preserve Firmware-assisted dump"
        depends on PPC64 && PPC_POWERNV && !FA_DUMP
        help
          On a kernel with FA_DUMP disabled, this option helps to preserve
          crash data from a previously crash'ed kernel. Useful when the next
          memory preserving kernel boot would process this crash data.
          Petitboot kernel is the typical usecase for this option.

config OPAL_CORE
        bool "Export OPAL memory as /sys/firmware/opal/core"
        depends on PPC64 && PPC_POWERNV
        help
          This option uses the MPIPL support in firmware to provide an
          ELF core of OPAL memory after a crash. The ELF core is exported
          as /sys/firmware/opal/core file which is helpful in debugging
          OPAL crashes using GDB.

config IRQ_ALL_CPUS
        bool "Distribute interrupts on all CPUs by default"
        depends on SMP
        help
          This option gives the kernel permission to distribute IRQs across
          multiple CPUs.  Saying N here will route all IRQs to the first
          CPU.  Generally saying Y is safe, although some problems have been
          reported with SMP Power Macintoshes with this option enabled.

config NUMA
        bool "NUMA Memory Allocation and Scheduler Support"
        depends on PPC64 && SMP
        default y if PPC_PSERIES || PPC_POWERNV
        select USE_PERCPU_NUMA_NODE_ID
        help
          Enable NUMA (Non-Uniform Memory Access) support.

          The kernel will try to allocate memory used by a CPU on the
          local memory controller of the CPU and add some more
          NUMA awareness to the kernel.

config NODES_SHIFT
        int
        default "8" if PPC64
        default "4"
        depends on NUMA

config HAVE_MEMORYLESS_NODES
        def_bool y
        depends on NUMA

config ARCH_SELECT_MEMORY_MODEL
        def_bool y
        depends on PPC64

config ARCH_FLATMEM_ENABLE
        def_bool y
        depends on (PPC64 && !NUMA) || PPC32

config ARCH_SPARSEMEM_ENABLE
        def_bool y
        depends on PPC64
        select SPARSEMEM_VMEMMAP_ENABLE

config ARCH_SPARSEMEM_DEFAULT
        def_bool y
        depends on PPC_BOOK3S_64

config ILLEGAL_POINTER_VALUE
        hex
        # This is roughly half way between the top of user space and the bottom
        # of kernel space, which seems about as good as we can get.
        default 0x5deadbeef0000000 if PPC64
        default 0

config ARCH_MEMORY_PROBE
        def_bool y
        depends on MEMORY_HOTPLUG

choice
        prompt "Page size"
        default PPC_64K_PAGES if PPC_BOOK3S_64
        default PPC_4K_PAGES
        help
          Select the kernel logical page size. Increasing the page size
          will reduce software overhead at each page boundary, allow
          hardware prefetch mechanisms to be more effective, and allow
          larger dma transfers increasing IO efficiency and reducing
          overhead. However the utilization of memory will increase.
          For example, each cached file will using a multiple of the
          page size to hold its contents and the difference between the
          end of file and the end of page is wasted.

          Some dedicated systems, such as software raid serving with
          accelerated calculations, have shown significant increases.

          If you configure a 64 bit kernel for 64k pages but the
          processor does not support them, then the kernel will simulate
          them with 4k pages, loading them on demand, but with the
          reduced software overhead and larger internal fragmentation.
          For the 32 bit kernel, a large page option will not be offered
          unless it is supported by the configured processor.

          If unsure, choose 4K_PAGES.

config PPC_4K_PAGES
        bool "4k page size"
        select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64

config PPC_16K_PAGES
        bool "16k page size"
        depends on 44x || PPC_8xx

config PPC_64K_PAGES
        bool "64k page size"
        depends on 44x || PPC_BOOK3S_64
        select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64

config PPC_256K_PAGES
        bool "256k page size (Requires non-standard binutils settings)"
        depends on 44x && !PPC_47x
        help
          Make the page size 256k.

          The kernel will only be able to run applications that have been
          compiled with '-zmax-page-size' set to 256K (the default is 64K) using
          binutils later than 2.17.50.0.3, or by patching the ELF_MAXPAGESIZE
          definition from 0x10000 to 0x40000 in older versions.

endchoice

config PAGE_SIZE_4KB
        def_bool y
        depends on PPC_4K_PAGES

config PAGE_SIZE_16KB
        def_bool y
        depends on PPC_16K_PAGES

config PAGE_SIZE_64KB
        def_bool y
        depends on PPC_64K_PAGES

config PAGE_SIZE_256KB
        def_bool y
        depends on PPC_256K_PAGES

config PPC_PAGE_SHIFT
        int
        default 18 if PPC_256K_PAGES
        default 16 if PPC_64K_PAGES
        default 14 if PPC_16K_PAGES
        default 12

config THREAD_SHIFT
        int "Thread shift" if EXPERT
        range 13 15
        default "15" if PPC_256K_PAGES
        default "14" if PPC64
        default "13"
        help
          Used to define the stack size. The default is almost always what you
          want. Only change this if you know what you are doing.

config DATA_SHIFT_BOOL
        bool "Set custom data alignment"
        depends on ADVANCED_OPTIONS
        depends on STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE
        depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
                   PPC_85xx
        help
          This option allows you to set the kernel data alignment. When
          RAM is mapped by blocks, the alignment needs to fit the size and
          number of possible blocks. The default should be OK for most configs.

          Say N here unless you know what you are doing.

config DATA_SHIFT
        int "Data shift" if DATA_SHIFT_BOOL
        default 24 if STRICT_KERNEL_RWX && PPC64
        range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
        range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
        range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx
        default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
        default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32
        default 23 if STRICT_KERNEL_RWX && PPC_8xx
        default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
        default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
        default 24 if STRICT_KERNEL_RWX && PPC_85xx
        default PPC_PAGE_SHIFT
        help
          On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
          Smaller is the alignment, greater is the number of necessary DBATs.

          On 8xx, large pages (512kb or 8M) are used to map kernel linear
          memory. Aligning to 8M reduces TLB misses as only 8M pages are used
          in that case. If PIN_TLB is selected, it must be aligned to 8M as
          8M pages will be pinned.

config ARCH_FORCE_MAX_ORDER
        int "Maximum zone order"
        range 8 9 if PPC64 && PPC_64K_PAGES
        default "9" if PPC64 && PPC_64K_PAGES
        range 13 13 if PPC64 && !PPC_64K_PAGES
        default "13" if PPC64 && !PPC_64K_PAGES
        range 9 64 if PPC32 && PPC_16K_PAGES
        default "9" if PPC32 && PPC_16K_PAGES
        range 7 64 if PPC32 && PPC_64K_PAGES
        default "7" if PPC32 && PPC_64K_PAGES
        range 5 64 if PPC32 && PPC_256K_PAGES
        default "5" if PPC32 && PPC_256K_PAGES
        range 11 64
        default "11"
        help
          The kernel memory allocator divides physically contiguous memory
          blocks into "zones", where each zone is a power of two number of
          pages.  This option selects the largest power of two that the kernel
          keeps in the memory allocator.  If you need to allocate very large
          blocks of physically contiguous memory, then you may need to
          increase this value.

          This config option is actually maximum order plus one. For example,
          a value of 11 means that the largest free memory block is 2^10 pages.

          The page size is not necessarily 4KB.  For example, on 64-bit
          systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
          this in mind when choosing a value for this option.

config PPC_SUBPAGE_PROT
        bool "Support setting protections for 4k subpages (subpage_prot syscall)"
        default n
        depends on PPC_64S_HASH_MMU && PPC_64K_PAGES
        help
          This option adds support for system call to allow user programs
          to set access permissions (read/write, readonly, or no access)
          on the 4k subpages of each 64k page.

          If unsure, say N here.

config PPC_PROT_SAO_LPAR
        bool "Support PROT_SAO mappings in LPARs"
        depends on PPC_BOOK3S_64
        help
          This option adds support for PROT_SAO mappings from userspace
          inside LPARs on supported CPUs.

          This may cause issues when performing guest migration from
          a CPU that supports SAO to one that does not.

          If unsure, say N here.

config PPC_COPRO_BASE
        bool

config SCHED_SMT
        bool "SMT (Hyperthreading) scheduler support"
        depends on PPC64 && SMP
        help
          SMT scheduler support improves the CPU scheduler's decision making
          when dealing with POWER5 cpus at a cost of slightly increased
          overhead in some places. If unsure say N here.

config PPC_DENORMALISATION
        bool "PowerPC denormalisation exception handling"
        depends on PPC_BOOK3S_64
        default "y" if PPC_POWERNV
        help
          Add support for handling denormalisation of single precision
          values.  Useful for bare metal only.  If unsure say Y here.

config CMDLINE
        string "Initial kernel command string"
        default ""
        help
          On some platforms, there is currently no way for the boot loader to
          pass arguments to the kernel. For these platforms, you can supply
          some command-line options at build time by entering them here.  In
          most cases you will need to specify the root device here.

choice
        prompt "Kernel command line type" if CMDLINE != ""
        default CMDLINE_FROM_BOOTLOADER

config CMDLINE_FROM_BOOTLOADER
        bool "Use bootloader kernel arguments if available"
        help
          Uses the command-line options passed by the boot loader. If
          the boot loader doesn't provide any, the default kernel command
          string provided in CMDLINE will be used.

config CMDLINE_EXTEND
        bool "Extend bootloader kernel arguments"
        help
          The command-line arguments provided by the boot loader will be
          appended to the default kernel command string.

config CMDLINE_FORCE
        bool "Always use the default kernel command string"
        help
          Always use the default kernel command string, even if the boot
          loader passes other arguments to the kernel.
          This is useful if you cannot or don't want to change the
          command-line options your boot loader passes to the kernel.

endchoice

config EXTRA_TARGETS
        string "Additional default image types"
        help
          List additional targets to be built by the bootwrapper here (separated
          by spaces).  This is useful for targets that depend of device tree
          files in the .dts directory.

          Targets in this list will be build as part of the default build
          target, or when the user does a 'make zImage' or a
          'make zImage.initrd'.

          If unsure, leave blank

config ARCH_WANTS_FREEZER_CONTROL
        def_bool y
        depends on ADB_PMU

source "kernel/power/Kconfig"

config PPC_MEM_KEYS
        prompt "PowerPC Memory Protection Keys"
        def_bool y
        depends on PPC_BOOK3S_64
        depends on PPC_64S_HASH_MMU
        select ARCH_USES_HIGH_VMA_FLAGS
        select ARCH_HAS_PKEYS
        help
          Memory Protection Keys provides a mechanism for enforcing
          page-based protections, but without requiring modification of the
          page tables when an application changes protection domains.

          For details, see Documentation/core-api/protection-keys.rst

          If unsure, say y.

config PPC_SECURE_BOOT
        prompt "Enable secure boot support"
        bool
        depends on PPC_POWERNV || PPC_PSERIES
        depends on IMA_ARCH_POLICY
        imply IMA_SECURE_AND_OR_TRUSTED_BOOT
        help
          Systems with firmware secure boot enabled need to define security
          policies to extend secure boot to the OS. This config allows a user
          to enable OS secure boot on systems that have firmware support for
          it. If in doubt say N.

config PPC_SECVAR_SYSFS
        bool "Enable sysfs interface for POWER secure variables"
        default y
        depends on PPC_SECURE_BOOT
        depends on SYSFS
        help
          POWER secure variables are managed and controlled by firmware.
          These variables are exposed to userspace via sysfs to enable
          read/write operations on these variables. Say Y if you have
          secure boot enabled and want to expose variables to userspace.

endmenu

config ISA_DMA_API
        bool
        default PCI

menu "Bus options"

config ISA
        bool "Support for ISA-bus hardware"
        depends on PPC_CHRP
        select PPC_I8259
        help
          Find out whether you have ISA slots on your motherboard.  ISA is the
          name of a bus system, i.e. the way the CPU talks to the other stuff
          inside your box.  If you have an Apple machine, say N here; if you
          have an IBM RS/6000 or pSeries machine, say Y.  If you have an
          embedded board, consult your board documentation.

config GENERIC_ISA_DMA
        bool
        depends on ISA_DMA_API
        default y

config PPC_INDIRECT_PCI
        bool
        depends on PCI
        default y if 40x || 44x

config SBUS
        bool

config FSL_SOC
        bool

config FSL_PCI
        bool
        select ARCH_HAS_DMA_SET_MASK
        select PPC_INDIRECT_PCI
        select PCI_QUIRKS

config FSL_PMC
        bool
        default y
        depends on SUSPEND && (PPC_85xx || PPC_86xx)
        help
          Freescale MPC85xx/MPC86xx power management controller support
          (suspend/resume). For MPC83xx see platforms/83xx/suspend.c

config PPC4xx_CPM
        bool
        default y
        depends on SUSPEND && (44x || 40x)
        help
          PPC4xx Clock Power Management (CPM) support (suspend/resume).
          It also enables support for two different idle states (idle-wait
          and idle-doze).

config 4xx_SOC
        bool

config FSL_LBC
        bool "Freescale Local Bus support"
        help
          Enables reporting of errors from the Freescale local bus
          controller.  Also contains some common code used by
          drivers for specific local bus peripherals.

config FSL_GTM
        bool
        depends on PPC_83xx || QUICC_ENGINE || CPM2
        help
          Freescale General-purpose Timers support

config PCI_8260
        bool
        depends on PCI && 8260
        select PPC_INDIRECT_PCI
        default y

config FSL_RIO
        bool "Freescale Embedded SRIO Controller support"
        depends on RAPIDIO = y && HAVE_RAPIDIO
        default "n"
        help
          Include support for RapidIO controller on Freescale embedded
          processors (MPC8548, MPC8641, etc).

endmenu

config NONSTATIC_KERNEL
        bool

menu "Advanced setup"
        depends on PPC32

config ADVANCED_OPTIONS
        bool "Prompt for advanced kernel configuration options"
        help
          This option will enable prompting for a variety of advanced kernel
          configuration options.  These options can cause the kernel to not
          work if they are set incorrectly, but can be used to optimize certain
          aspects of kernel memory management.

          Unless you know what you are doing, say N here.

comment "Default settings for advanced configuration options are used"
        depends on !ADVANCED_OPTIONS

config LOWMEM_SIZE_BOOL
        bool "Set maximum low memory"
        depends on ADVANCED_OPTIONS
        help
          This option allows you to set the maximum amount of memory which
          will be used as "low memory", that is, memory which the kernel can
          access directly, without having to set up a kernel virtual mapping.
          This can be useful in optimizing the layout of kernel virtual
          memory.

          Say N here unless you know what you are doing.

config LOWMEM_SIZE
        hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
        default "0x30000000"

config LOWMEM_CAM_NUM_BOOL
        bool "Set number of CAMs to use to map low memory"
        depends on ADVANCED_OPTIONS && PPC_85xx
        help
          This option allows you to set the maximum number of CAM slots that
          will be used to map low memory.  There are a limited number of slots
          available and even more limited number that will fit in the L1 MMU.
          However, using more entries will allow mapping more low memory.  This
          can be useful in optimizing the layout of kernel virtual memory.

          Say N here unless you know what you are doing.

config LOWMEM_CAM_NUM
        depends on PPC_85xx
        int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
        default 3 if !STRICT_KERNEL_RWX
        default 9 if DATA_SHIFT >= 24
        default 12 if DATA_SHIFT >= 22
        default 15

config DYNAMIC_MEMSTART
        bool "Enable page aligned dynamic load address for kernel"
        depends on ADVANCED_OPTIONS && FLATMEM && (PPC_85xx || 44x)
        select NONSTATIC_KERNEL
        help
          This option enables the kernel to be loaded at any page aligned
          physical address. The kernel creates a mapping from KERNELBASE to
          the address where the kernel is loaded. The page size here implies
          the TLB page size of the mapping for kernel on the particular platform.
          Please refer to the init code for finding the TLB page size.

          DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
          kernel image, where the only restriction is the page aligned kernel
          load address. When this option is enabled, the compile time physical
          address CONFIG_PHYSICAL_START is ignored.

          This option is overridden by CONFIG_RELOCATABLE

config PAGE_OFFSET_BOOL
        bool "Set custom page offset address"
        depends on ADVANCED_OPTIONS
        help
          This option allows you to set the kernel virtual address at which
          the kernel will map low memory.  This can be useful in optimizing
          the virtual memory layout of the system.

          Say N here unless you know what you are doing.

config PAGE_OFFSET
        hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
        default "0xc0000000"

config KERNEL_START_BOOL
        bool "Set custom kernel base address"
        depends on ADVANCED_OPTIONS
        help
          This option allows you to set the kernel virtual address at which
          the kernel will be loaded.  Normally this should match PAGE_OFFSET
          however there are times (like kdump) that one might not want them
          to be the same.

          Say N here unless you know what you are doing.

config KERNEL_START
        hex "Virtual address of kernel base" if KERNEL_START_BOOL
        default PAGE_OFFSET if PAGE_OFFSET_BOOL
        default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
        default "0xc0000000"

config PHYSICAL_START_BOOL
        bool "Set physical address where the kernel is loaded"
        depends on ADVANCED_OPTIONS && FLATMEM && PPC_85xx
        help
          This gives the physical address where the kernel is loaded.

          Say N here unless you know what you are doing.

config PHYSICAL_START
        hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
        default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
        default "0x00000000"

config PHYSICAL_ALIGN
        hex
        default "0x04000000" if PPC_85xx
        help
          This value puts the alignment restrictions on physical address
          where kernel is loaded and run from. Kernel is compiled for an
          address which meets above alignment restriction.

config TASK_SIZE_BOOL
        bool "Set custom user task size"
        depends on ADVANCED_OPTIONS
        help
          This option allows you to set the amount of virtual address space
          allocated to user tasks.  This can be useful in optimizing the
          virtual memory layout of the system.

          Say N here unless you know what you are doing.

config TASK_SIZE
        hex "Size of user task space" if TASK_SIZE_BOOL
        default "0x80000000" if PPC_8xx
        default "0xb0000000" if PPC_BOOK3S_32
        default "0xc0000000"
endmenu

if PPC64
# This value must have zeroes in the bottom 60 bits otherwise lots will break
config PAGE_OFFSET
        hex
        default "0xc000000000000000"
config KERNEL_START
        hex
        default "0xc000000000000000"
config PHYSICAL_START
        hex
        default "0x00000000"
endif

config PPC_LIB_RHEAP
        bool

source "arch/powerpc/kvm/Kconfig"

source "kernel/livepatch/Kconfig"