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- # SPDX-License-Identifier: GPL-2.0
- source "arch/powerpc/platforms/Kconfig.cputype"
- config 32BIT
- bool
- default y if PPC32
- config 64BIT
- bool
- default y if PPC64
- 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 HAVE_SETUP_PER_CPU_AREA
- def_bool PPC64
- config NEED_PER_CPU_EMBED_FIRST_CHUNK
- def_bool y if PPC64
- config NEED_PER_CPU_PAGE_FIRST_CHUNK
- def_bool y if PPC64
- config NR_IRQS
- int "Number of virtual interrupt numbers"
- range 32 32768
- 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
- seleted 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 TRACE_IRQFLAGS_SUPPORT
- bool
- default y
- config LOCKDEP_SUPPORT
- bool
- default y
- config GENERIC_LOCKBREAK
- bool
- default y
- depends on SMP && PREEMPTION
- 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_HAS_DEBUG_VIRTUAL
- select ARCH_HAS_DEVMEM_IS_ALLOWED
- select ARCH_HAS_ELF_RANDOMIZE
- select ARCH_HAS_FORTIFY_SOURCE
- select ARCH_HAS_GCOV_PROFILE_ALL
- select ARCH_HAS_KCOV
- select ARCH_HAS_HUGEPD if HUGETLB_PAGE
- select ARCH_HAS_MEMREMAP_COMPAT_ALIGN
- select ARCH_HAS_MMIOWB if PPC64
- select ARCH_HAS_PHYS_TO_DMA
- select ARCH_HAS_PMEM_API
- select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
- select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
- select ARCH_HAS_PTE_SPECIAL
- select ARCH_HAS_MEMBARRIER_CALLBACKS
- select ARCH_HAS_MEMBARRIER_SYNC_CORE
- select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
- select ARCH_HAS_STRICT_KERNEL_RWX if (PPC32 && !HIBERNATION)
- select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
- select ARCH_HAS_UACCESS_FLUSHCACHE
- select ARCH_HAS_COPY_MC if PPC64
- 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_SUPPORTS_ATOMIC_RMW
- select ARCH_USE_BUILTIN_BSWAP
- select ARCH_USE_CMPXCHG_LOCKREF if PPC64
- select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
- select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
- select ARCH_WANT_IPC_PARSE_VERSION
- select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
- select ARCH_WANT_LD_ORPHAN_WARN
- select ARCH_WEAK_RELEASE_ACQUIRE
- select BINFMT_ELF
- select BUILDTIME_TABLE_SORT
- select CLONE_BACKWARDS
- select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
- select DMA_OPS if PPC64
- select DMA_OPS_BYPASS if PPC64
- select DYNAMIC_FTRACE if FUNCTION_TRACER
- select EDAC_ATOMIC_SCRUB
- select EDAC_SUPPORT
- select GENERIC_ATOMIC64 if PPC32
- select GENERIC_CLOCKEVENTS
- 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_IRQ_SHOW
- select GENERIC_IRQ_SHOW_LEVEL
- select GENERIC_PCI_IOMAP if PCI
- select GENERIC_SMP_IDLE_THREAD
- select GENERIC_STRNCPY_FROM_USER
- select GENERIC_STRNLEN_USER
- select GENERIC_TIME_VSYSCALL
- select HAVE_ARCH_AUDITSYSCALL
- select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
- select HAVE_ARCH_JUMP_LABEL
- select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
- select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
- 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_C_RECORDMCOUNT
- select HAVE_CBPF_JIT if !PPC64
- select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
- select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
- select HAVE_CONTEXT_TRACKING if PPC64
- select HAVE_TIF_NOHZ if PPC64
- select HAVE_DEBUG_KMEMLEAK
- select HAVE_DEBUG_STACKOVERFLOW
- select HAVE_DYNAMIC_FTRACE
- select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
- select HAVE_EBPF_JIT if PPC64
- select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
- select HAVE_FAST_GUP
- select HAVE_FTRACE_MCOUNT_RECORD
- 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_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
- select HAVE_IDE
- select HAVE_IOREMAP_PROT
- select HAVE_IRQ_EXIT_ON_IRQ_STACK
- 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_HARDLOCKUP_DETECTOR_ARCH if PPC64 && PPC_BOOK3S && SMP
- select HAVE_OPROFILE
- select HAVE_OPTPROBES if PPC64
- select HAVE_PERF_EVENTS
- select HAVE_PERF_EVENTS_NMI if PPC64
- select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
- select HAVE_PERF_REGS
- select HAVE_PERF_USER_STACK_DUMP
- select MMU_GATHER_RCU_TABLE_FREE
- select MMU_GATHER_PAGE_SIZE
- select HAVE_REGS_AND_STACK_ACCESS_API
- select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
- select HAVE_SYSCALL_TRACEPOINTS
- select HAVE_VIRT_CPU_ACCOUNTING
- select HAVE_IRQ_TIME_ACCOUNTING
- select HAVE_RSEQ
- select IOMMU_HELPER if PPC64
- select IRQ_DOMAIN
- select IRQ_FORCED_THREADING
- select MODULES_USE_ELF_RELA
- select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
- 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 SYSCTL_EXCEPTION_TRACE
- select THREAD_INFO_IN_TASK
- select VIRT_TO_BUS if !PPC64
- #
- # Please keep this list sorted alphabetically.
- #
- config PPC_BARRIER_NOSPEC
- bool
- default y
- depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
- config EARLY_PRINTK
- bool
- default y
- config PANIC_TIMEOUT
- int
- default 180
- config COMPAT
- bool "Enable support for 32bit binaries"
- depends on PPC64
- default y if !CPU_LITTLE_ENDIAN
- select COMPAT_BINFMT_ELF
- select ARCH_WANT_OLD_COMPAT_IPC
- select COMPAT_OLD_SIGACTION
- config SYSVIPC_COMPAT
- bool
- depends on COMPAT && SYSVIPC
- default y
- 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 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 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_OF_PLATFORM_PCI
- bool
- depends on PCI
- depends on PPC64 # not supported on 32 bits yet
- config ARCH_SUPPORTS_DEBUG_PAGEALLOC
- depends on PPC32 || PPC_BOOK3S_64
- def_bool y
- 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 ZONE_DMA
- bool
- default y if PPC_BOOK3E_64
- 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
- source "kernel/Kconfig.hz"
- config HUGETLB_PAGE_SIZE_VARIABLE
- bool
- depends on HUGETLB_PAGE && PPC_BOOK3S_64
- default y
- config MATH_EMULATION
- bool "Math emulation"
- depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
- 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 PPC_QUEUED_SPINLOCKS
- bool "Queued spinlocks"
- depends on SMP
- 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.
- This option is currently experimental, the code is more complex and
- less tested so it defaults to "N" for the moment.
- If unsure, say "N".
- config ARCH_CPU_PROBE_RELEASE
- def_bool y
- depends on HOTPLUG_CPU
- config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
- config ARCH_ENABLE_MEMORY_HOTREMOVE
- def_bool y
- 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 || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
- 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
- select BUILD_BIN2C
- 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 RELOCATABLE
- bool "Build a relocatable kernel"
- depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
- select NONSTATIC_KERNEL
- select MODULE_REL_CRCS if MODVERSIONS
- 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 (FSL_BOOKE && FLATMEM && PPC32)
- 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 || FSL_BOOKE || (44x && !SMP)
- select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
- 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 support"
- depends on PPC64
- default y if SMP && PPC_PSERIES
- config NODES_SHIFT
- int
- default "8" if PPC64
- default "4"
- depends on NEED_MULTIPLE_NODES
- config USE_PERCPU_NUMA_NODE_ID
- def_bool y
- 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 SYS_SUPPORTS_HUGETLBFS
- bool
- 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
- config STDBINUTILS
- bool "Using standard binutils settings"
- depends on 44x
- default y
- help
- Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
- Note, that kernel will be able to run only those applications,
- which had been compiled using binutils later than 2.17.50.0.3 with
- '-zmax-page-size' set to 256K (the default is 64K). Or, if using
- the older binutils, you can patch them with a trivial patch, which
- changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
- choice
- prompt "Page size"
- 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"
- depends on 44x && !STDBINUTILS && !PPC_47x
- help
- Make the page size 256k.
- As the ELF standard only requires alignment to support page
- sizes up to 64k, you will need to compile all of your user
- space applications with a non-standard binutils settings
- (see the STDBINUTILS description for details).
- Say N unless you know what you are doing.
- endchoice
- 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 "14" if KASAN
- 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
- depends on PPC_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && \
- (!PIN_TLB_TEXT || !STRICT_KERNEL_RWX))
- 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) && PPC_BOOK3S_32
- range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
- default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
- default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
- default 23 if STRICT_KERNEL_RWX && PPC_8xx
- default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
- default 19 if DEBUG_PAGEALLOC && PPC_8xx
- 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 FORCE_MAX_ZONEORDER
- 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_BOOK3S_64 && 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
- 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.
- config PPC_RTAS_FILTER
- bool "Enable filtering of RTAS syscalls"
- default y
- depends on PPC_RTAS
- help
- The RTAS syscall API has security issues that could be used to
- compromise system integrity. This option enforces restrictions on the
- RTAS calls and arguments passed by userspace programs to mitigate
- these issues.
- Say Y unless you know what you are doing and the filter is causing
- problems for you.
- 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 && FSL_BOOKE
- 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 FSL_BOOKE
- int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
- default 3
- config DYNAMIC_MEMSTART
- bool "Enable page aligned dynamic load address for kernel"
- depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 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 && FSL_BOOKE
- 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 FSL_BOOKE
- 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 && STRICT_KERNEL_RWX
- 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 ARCH_RANDOM
- def_bool n
- config PPC_LIB_RHEAP
- bool
- source "arch/powerpc/kvm/Kconfig"
- source "kernel/livepatch/Kconfig"
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