arch/powerpc/Kconfig - linux/kernel/git/dtor/input - Git at Google


            
            # SPDX-License-Identifier: GPL-2.0

            
            source "arch/powerpc/platforms/Kconfig.cputype"


            config CC_HAS_ELFV2

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


            config CC_HAS_PREFIXED

            
            	def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)


            config CC_HAS_PCREL

            
            	# Clang has a bug (https://github.com/llvm/llvm-project/issues/62372)

            
            	# where pcrel code is not generated if -msoft-float, -mno-altivec, or

            
            	# -mno-vsx options are also given. Without these options, fp/vec

            
            	# instructions are generated from regular kernel code. So Clang can't

            
            	# do pcrel yet.

            
            	def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel)


            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_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_NEEDS_DEFER_KASAN		if PPC_RADIX_MMU

            
            	select ARCH_DISABLE_KASAN_INLINE	if PPC_RADIX_MMU

            
            	select ARCH_DMA_DEFAULT_COHERENT	if !NOT_COHERENT_CACHE

            
            	select ARCH_ENABLE_MEMORY_HOTPLUG

            
            	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_DMA_OPS			if PPC64

            
            	select ARCH_HAS_FORTIFY_SOURCE

            
            	select ARCH_HAS_GCOV_PROFILE_ALL

            
            	select ARCH_HAS_GIGANTIC_PAGE		if ARCH_SUPPORTS_HUGETLBFS

            
            	select ARCH_HAS_KCOV

            
            	select ARCH_HAS_KERNEL_FPU_SUPPORT	if PPC64 && PPC_FPU

            
            	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_PREEMPT_LAZY

            
            	select ARCH_HAS_PTDUMP

            
            	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) && !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

            
            	select ARCH_HAS_VDSO_ARCH_DATA

            
            	select ARCH_HAVE_NMI_SAFE_CMPXCHG

            
            	select ARCH_HAVE_EXTRA_ELF_NOTES        if SPU_BASE

            
            	select ARCH_KEEP_MEMBLOCK

            
            	select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE	if PPC_RADIX_MMU

            
            	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

            
            	select ARCH_SUPPORTS_HUGE_PFNMAP	if PPC_BOOK3S_64 && TRANSPARENT_HUGEPAGE

            
            	select ARCH_SUPPORTS_PAGE_TABLE_CHECK	if !HUGETLB_PAGE

            
            	select ARCH_SUPPORTS_SCHED_MC		if SMP

            
            	select ARCH_SUPPORTS_SCHED_SMT		if PPC64 && SMP

            
            	select SCHED_MC				if ARCH_SUPPORTS_SCHED_MC

            
            	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_BPF_JIT

            
            	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_WANT_OPTIMIZE_DAX_VMEMMAP	if PPC_RADIX_MMU

            
            	select ARCH_WANTS_MODULES_DATA_IN_VMALLOC	if PPC_BOOK3S_32 || PPC_8xx

            
            	select ARCH_WEAK_RELEASE_ACQUIRE

            
            	select AUDIT_ARCH_COMPAT_GENERIC

            
            	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 DYNAMIC_FTRACE			if FUNCTION_TRACER

            
            	select EDAC_ATOMIC_SCRUB

            
            	select EDAC_SUPPORT

            
            	select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if ARCH_USING_PATCHABLE_FUNCTION_ENTRY

            
            	select FUNCTION_ALIGNMENT_4B

            
            	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_ENTRY

            
            	select GENERIC_GETTIMEOFDAY

            
            	select GENERIC_IDLE_POLL_SETUP

            
            	select GENERIC_IOREMAP

            
            	select GENERIC_IRQ_SHOW

            
            	select GENERIC_IRQ_SHOW_LEVEL

            
            	select GENERIC_PCI_IOMAP		if PCI

            
            	select GENERIC_SMP_IDLE_THREAD

            
            	select HAS_IOPORT			if PCI

            
            	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 && 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_KCSAN

            
            	select HAVE_ARCH_KFENCE			if ARCH_SUPPORTS_DEBUG_PAGEALLOC

            
            	select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET

            
            	select HAVE_ARCH_WITHIN_STACK_FRAMES

            
            	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

            
            	select HAVE_C_RECORDMCOUNT

            
            	select HAVE_DEBUG_KMEMLEAK

            
            	select HAVE_DEBUG_STACKOVERFLOW

            
            	select HAVE_DYNAMIC_FTRACE

            
            	select HAVE_DYNAMIC_FTRACE_WITH_ARGS	if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32

            
            	select HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS if PPC_FTRACE_OUT_OF_LINE || (PPC32 && ARCH_USING_PATCHABLE_FUNCTION_ENTRY)

            
            	select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS if HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS

            
            	select HAVE_DYNAMIC_FTRACE_WITH_REGS	if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32

            
            	select HAVE_EBPF_JIT

            
            	select HAVE_EFFICIENT_UNALIGNED_ACCESS

            
            	select HAVE_GUP_FAST

            
            	select HAVE_FTRACE_GRAPH_FUNC

            
            	select HAVE_FTRACE_REGS_HAVING_PT_REGS

            
            	select HAVE_FUNCTION_ARG_ACCESS_API

            
            	select HAVE_FUNCTION_DESCRIPTORS	if PPC64_ELF_ABI_V1

            
            	select HAVE_FUNCTION_ERROR_INJECTION

            
            	select HAVE_FUNCTION_GRAPH_FREGS

            
            	select HAVE_FUNCTION_GRAPH_TRACER

            
            	select HAVE_FUNCTION_TRACER		if !COMPILE_TEST && (PPC64 || (PPC32 && CC_IS_GCC))

            
            	select HAVE_GCC_PLUGINS

            
            	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

            
            	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 if HAVE_OBJTOOL_MCOUNT && (!ARCH_USING_PATCHABLE_FUNCTION_ENTRY || (!CC_IS_GCC || GCC_VERSION >= 110100))

            
            	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 ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32

            
            	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_PREEMPT_DYNAMIC_KEY

            
            	select HAVE_RETHOOK			if KPROBES

            
            	select HAVE_REGS_AND_STACK_ACCESS_API

            
            	select HAVE_RELIABLE_STACKTRACE

            
            	select HAVE_RSEQ

            
            	select HAVE_SAMPLE_FTRACE_DIRECT	if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS

            
            	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI	if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS

            
            	select HAVE_SETUP_PER_CPU_AREA		if PPC64

            
            	select HAVE_SOFTIRQ_ON_OWN_STACK

            
            	select HAVE_STACKPROTECTOR		if PPC32 && $(cc-option,$(m32-flag) -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 -mstack-protector-guard-offset=0)

            
            	select HAVE_STACKPROTECTOR		if PPC64 && $(cc-option,$(m64-flag) -mstack-protector-guard=tls -mstack-protector-guard-reg=r13 -mstack-protector-guard-offset=0)

            
            	select HAVE_STATIC_CALL			if PPC32

            
            	select HAVE_STATIC_CALL_INLINE		if PPC32

            
            	select HAVE_SYSCALL_TRACEPOINTS

            
            	select HAVE_VIRT_CPU_ACCOUNTING

            
            	select HAVE_VIRT_CPU_ACCOUNTING_GEN

            
            	select HOTPLUG_SMT			if HOTPLUG_CPU

            
            	select SMT_NUM_THREADS_DYNAMIC

            
            	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 && EXECMEM

            
            	select LOCK_MM_AND_FIND_VMA

            
            	select MMU_GATHER_PAGE_SIZE

            
            	select MMU_GATHER_RCU_TABLE_FREE

            
            	select HAVE_ARCH_TLB_REMOVE_TABLE

            
            	select MMU_GATHER_MERGE_VMAS

            
            	select MMU_LAZY_TLB_SHOOTDOWN		if PPC_BOOK3S_64

            
            	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_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

            
            	select VDSO_GETRANDOM

            
            	#

            
            	# Please keep this list sorted alphabetically.

            
            	#


            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

            
            	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 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


            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

            
            	bool

            
            	depends on PPC_DCR_NATIVE

            
            	default y


            config PPC_PCI_OF_BUS_MAP

            
            	bool "Use pci_to_OF_bus_map (deprecated)"

            
            	depends on PPC32

            
            	depends on PPC_PMAC || PPC_CHRP

            
            	help

            
            	  This option uses pci_to_OF_bus_map to map OF nodes to PCI devices, which

            
            	  restricts the system to only having 256 PCI buses. On CHRP it also causes

            
            	  the "pci-OF-bus-map" property to be created in the device tree.


            	  If unsure, say "N".


            config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT

            
            	depends on PPC32

            
            	depends on !PPC_PCI_OF_BUS_MAP

            
            	bool "Assign PCI bus numbers from zero individually for each PCI domain"

            
            	default y

            
            	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 ARCH_SUPPORTS_UPROBES

            
            	def_bool y


            config PPC_ADV_DEBUG_REGS

            
            	bool

            
            	depends on 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 44x || 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_ELF_ABI_V2 && FUNCTION_TRACER

            
            	def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN

            
            	def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN


            config ARCH_USING_PATCHABLE_FUNCTION_ENTRY

            
            	depends on FUNCTION_TRACER && (PPC32 || PPC64_ELF_ABI_V2)

            
            	depends on $(cc-option,-fpatchable-function-entry=2)

            
            	def_bool y if PPC32

            
            	def_bool $(success,$(srctree)/arch/powerpc/tools/check-fpatchable-function-entry.sh $(CC) $(CLANG_FLAGS) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN

            
            	def_bool $(success,$(srctree)/arch/powerpc/tools/check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN


            config PPC_FTRACE_OUT_OF_LINE

            
            	def_bool PPC64 && ARCH_USING_PATCHABLE_FUNCTION_ENTRY

            
            	select ARCH_WANTS_PRE_LINK_VMLINUX


            config PPC_FTRACE_OUT_OF_LINE_NUM_RESERVE

            
            	int "Number of ftrace out-of-line stubs to reserve within .text"

            
            	depends on PPC_FTRACE_OUT_OF_LINE

            
            	default 32768

            
            	help

            
            	  Number of stubs to reserve for use by ftrace. This space is

            
            	  reserved within .text, and is distinct from any additional space

            
            	  added at the end of .text before the final vmlinux link. Set to

            
            	  zero to have stubs only be generated at the end of vmlinux (only

            
            	  if the size of vmlinux is less than 32MB). Set to a higher value

            
            	  if building vmlinux larger than 48MB.


            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 ARCH_SUPPORTS_KEXEC

            
            	def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP)


            config ARCH_SUPPORTS_KEXEC_FILE

            
            	def_bool PPC64


            config ARCH_SUPPORTS_KEXEC_PURGATORY

            
            	def_bool y


            config ARCH_SELECTS_KEXEC_FILE

            
            	def_bool y

            
            	depends on KEXEC_FILE

            
            	select KEXEC_ELF

            
            	select HAVE_IMA_KEXEC if IMA


            config PPC64_BIG_ENDIAN_ELF_ABI_V2

            
            	# Option is available to BFD, but LLD does not support ELFv1 so this is

            
            	# always true there.

            
            	prompt "Build big-endian kernel using ELF ABI V2" if LD_IS_BFD && EXPERT

            
            	def_bool y

            
            	depends on PPC64 && CPU_BIG_ENDIAN

            
            	depends on CC_HAS_ELFV2

            
            	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.


            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 ARCH_SUPPORTS_CRASH_DUMP

            
            	def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)


            config ARCH_DEFAULT_CRASH_DUMP

            
            	bool

            
            	default y if !PPC_BOOK3S_32


            config ARCH_SELECTS_CRASH_DUMP

            
            	def_bool y

            
            	depends on CRASH_DUMP

            
            	select RELOCATABLE if PPC64 || 44x || PPC_85xx


            config ARCH_SUPPORTS_CRASH_HOTPLUG

            
            	def_bool y

            
            	depends on PPC64


            config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION

            
            	def_bool CRASH_RESERVE


            config FA_DUMP

            
            	bool "Firmware-assisted dump"

            
            	depends on CRASH_DUMP && PPC64 && (PPC_RTAS || PPC_POWERNV)

            
            	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

            
            	select HAVE_PAGE_SIZE_4KB


            config PPC_16K_PAGES

            
            	bool "16k page size"

            
            	depends on 44x || PPC_8xx

            
            	select HAVE_PAGE_SIZE_16KB


            config PPC_64K_PAGES

            
            	bool "64k page size"

            
            	depends on 44x || PPC_BOOK3S_64

            
            	select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64

            
            	select HAVE_PAGE_SIZE_64KB


            config PPC_256K_PAGES

            
            	bool "256k page size (Requires non-standard binutils settings)"

            
            	depends on 44x && !PPC_47x

            
            	select HAVE_PAGE_SIZE_256KB

            
            	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 THREAD_SHIFT

            
            	int "Thread shift" if EXPERT

            
            	range 13 15

            
            	default "15" if PPC_256K_PAGES

            
            	default "15" if PPC_PSERIES || PPC_POWERNV

            
            	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_8xx && !PIN_TLB_DATA && (!STRICT_KERNEL_RWX || !PIN_TLB_TEXT)) || \

            
            		   PPC_BOOK3S_32 || 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 14 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 || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && \

            
            		      (PIN_TLB_DATA || PIN_TLB_TEXT)

            
            	default 19 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx

            
            	default 24 if STRICT_KERNEL_RWX && PPC_85xx

            
            	default 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 (16kb or 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 "Order of maximal physically contiguous allocations"

            
            	range 7 8 if PPC64 && PPC_64K_PAGES

            
            	default "8" if PPC64 && PPC_64K_PAGES

            
            	range 12 12 if PPC64 && !PPC_64K_PAGES

            
            	default "12" if PPC64 && !PPC_64K_PAGES

            
            	range 8 10 if PPC32 && PPC_16K_PAGES

            
            	default "8" if PPC32 && PPC_16K_PAGES

            
            	range 6 10 if PPC32 && PPC_64K_PAGES

            
            	default "6" if PPC32 && PPC_64K_PAGES

            
            	range 4 10 if PPC32 && PPC_256K_PAGES

            
            	default "4" if PPC32 && PPC_256K_PAGES

            
            	range 10 12

            
            	default "10"

            
            	help

            
            	  The kernel page allocator limits the size of maximal physically

            
            	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it

            
            	  defines the maximal power of two of number of pages that can be

            
            	  allocated as a single contiguous block. This option allows

            
            	  overriding the default setting when ability to allocate very

            
            	  large blocks of physically contiguous memory is required.


            	  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.


            	  Don't change if unsure.


            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 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"

            
            	depends on 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 ARCH_PKEY_BITS

            
            	int

            
            	default 5


            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

            
            	select PSERIES_PLPKS if PPC_PSERIES

            
            	select HAVE_ARCH_GET_SECUREBOOT

            
            	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 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

            
            	help

            
            	  PPC4xx Clock Power Management (CPM) support (suspend/resume).

            
            	  It also enables support for two different idle states (idle-wait

            
            	  and idle-doze).


            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 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 maximum user task space" if TASK_SIZE_BOOL

            
            	default "0x80000000" if PPC_8xx

            
            	default "0xc0000000"


            config MODULES_SIZE_BOOL

            
            	bool "Set custom size for modules/execmem area"

            
            	depends on EXECMEM && ADVANCED_OPTIONS

            
            	help

            
            	  This option allows you to set the size of kernel virtual address

            
            	  space dedicated for modules/execmem.

            
            	  For the time being it is only for 8xx and book3s/32. Other

            
            	  platform share it with vmalloc space.


            	  Say N here unless you know what you are doing.


            config MODULES_SIZE

            
            	int "Size of modules/execmem area (In Mbytes)" if MODULES_SIZE_BOOL

            
            	range 1 256 if EXECMEM

            
            	default 64 if EXECMEM && PPC_BOOK3S_32

            
            	default 32 if EXECMEM && PPC_8xx

            
            	default 0


            endmenu


            config PPC64_PROC_SYSTEMCFG

            
            	def_bool y

            
            	depends on PPC64 && PROC_FS

            
            	help

            
            	  This option enables the presence of /proc/ppc64/systemcfg through

            
            	  which the systemcfg page can be accessed.

            
            	  This interface only exists for backwards-compatibility.


            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"