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_DMA_OPS			if PPC64
	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
	sele