path: root/arch/powerpc/Kconfig

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

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

config 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_DISABLE_KASAN_INLINE	if PPC_RADIX_MMU
	select ARCH_DMA_DEFAULT_COHERENT	if !NOT_COHERENT_CACHE
	select ARCH_ENABLE_MEMORY_HOTPLUG
	select ARCH_ENABLE_MEMORY_HOTREMOVE
	select ARCH_HAS_COPY_MC			if PPC64
	select ARCH_HAS_CURRENT_STACK_POINTER
	select ARCH_HAS_DEBUG_VIRTUAL
	select ARCH_HAS_DEBUG_VM_PGTABLE
	select ARCH_HAS_DEBUG_WX		if STRICT_KERNEL_RWX
	select ARCH_HAS_DEVMEM_IS_ALLOWED
	select ARCH_HAS_DMA_MAP_DIRECT 		if PPC_PSERIES
	select ARCH_HAS_FORTIFY_SOURCE
	select ARCH_HAS_GCOV_PROFILE_ALL
	select ARCH_HAS_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_PTE_DEVMAP		if PPC_BOOK3S_64
	select ARCH_HAS_PTE_SPECIAL
	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
	select ARCH_HAS_SET_MEMORY
	select ARCH_HAS_STRICT_KERNEL_RWX	if (PPC_BOOK3S || PPC_8xx) && !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_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_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 BINFMT_ELF
	select BUILDTIME_TABLE_SORT
	select CLONE_BACKWARDS
	select CPUMASK_OFFSTACK			if NR_CPUS >= 8192
	select DCACHE_WORD_ACCESS		if PPC64 && CPU_LITTLE_ENDIAN
	select DMA_OPS_BYPASS			if PPC64
	select DMA_OPS				if PPC64
	select DYNAMIC_FTRACE			if FUNCTION_TRACER
	select EDAC_ATOMIC_SCRUB
	select EDAC_SUPPORT
	select 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_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_PTDUMP
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_TIME_VSYSCALL
	select GENERIC_VDSO_TIME_NS
	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_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_MCOUNT_RECORD
	select HAVE_FUNCTION_ARG_ACCESS_API
	select HAVE_FUNCTION_DESCRIPTORS	if PPC64_ELF_ABI_V1
	select HAVE_FUNCTION_ERROR_INJECTION
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_FUNCTION_TRACER		if PPC64 || (PPC32 && CC_IS_GCC)
	select HAVE_GCC_PLUGINS			if GCC_VERSION >= 50200   # plugin support on gcc <= 5.1 is buggy on PPC
	select HAVE_GENERIC_VDSO
	select HAVE_HARDLOCKUP_DETECTOR_ARCH	if PPC_BOOK3S_64 && SMP
	select HAVE_HARDLOCKUP_DETECTOR_PERF	if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
	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_REGS_AND_STACK_ACCESS_API
	select HAVE_RELIABLE_STACKTRACE
	select HAVE_RSEQ
	select HAVE_SETUP_PER_CPU_AREA		if PPC64
	select HAVE_SOFTIRQ_ON_OWN_STACK
	select HAVE_STACKPROTECTOR		if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
	select HAVE_STACKPROTECTOR		if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
	select HAVE_STATIC_CALL			if PPC32
	select HAVE_SYSCALL_TRACEPOINTS
	select HAVE_VIRT_CPU_ACCOUNTING
	select 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 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
	#
	# 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 AUDIT_ARCH
	bool
	default y

config GENERIC_BUG
	bool
	default y
	depends on BUG

config GENERIC_BUG_RELATIVE_POINTERS
	def_bool y
	depends on GENERIC_BUG

config SYS_SUPPORTS_APM_EMULATION
	default y if PMAC_APM_EMU
	bool

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

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

config ARCH_HIBERNATION_POSSIBLE
	bool
	default y

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

config ARCH_SUSPEND_NONZERO_CPU
	def_bool y
	depends on PPC_POWERNV || PPC_PSERIES

config ARCH_HAS_ADD_PAGES
	def_bool y
	depends on ARCH_ENABLE_MEMORY_HOTPLUG

config PPC_DCR_NATIVE
	bool

config PPC_DCR_MMIO
	bool

config PPC_DCR
	bool
	depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
	default y

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

config ARCH_SUPPORTS_UPROBES
	def_bool y

config PPC_ADV_DEBUG_REGS
	bool
	depends on 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 h