# SPDX-License-Identifier: GPL-2.0
source "arch/powerpc/platforms/Kconfig.cputype"
config PPC32
bool
default y if !PPC64
config 32BIT
bool
default y if PPC32
config 64BIT
bool
default y if PPC64
config MMU
bool
default y
config ARCH_MMAP_RND_BITS_MAX
# On Book3S 64, the default virtual address space for 64-bit processes
# is 2^47 (128TB). As a maximum, allow randomisation to consume up to
# 32T of address space (2^45), which should ensure a reasonable gap
# between bottom-up and top-down allocations for applications that
# consume "normal" amounts of address space. Book3S 64 only supports 64K
# and 4K page sizes.
default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
#
# On all other 64-bit platforms (currently only Book3E), the virtual
# address space is 2^46 (64TB). Allow randomisation to consume up to 16T
# of address space (2^44). Only 4K page sizes are supported.
default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
#
# For 32-bit, use the compat values, as they're the same.
default ARCH_MMAP_RND_COMPAT_BITS_MAX
config ARCH_MMAP_RND_BITS_MIN
# Allow randomisation to consume up to 1GB of address space (2^30).
default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
#
# For 32-bit, use the compat values, as they're the same.
default ARCH_MMAP_RND_COMPAT_BITS_MIN
config ARCH_MMAP_RND_COMPAT_BITS_MAX
# Total virtual address space for 32-bit processes is 2^31 (2GB).
# Allow randomisation to consume up to 512MB of address space (2^29).
default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
default 17 # 17 = 29 (512MB) - 12 (4K)
config ARCH_MMAP_RND_COMPAT_BITS_MIN
# Total virtual address space for 32-bit processes is 2^31 (2GB).
# Allow randomisation to consume up to 8MB of address space (2^23).
default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
default 11 # 11 = 23 (8MB) - 12 (4K)
config HAVE_SETUP_PER_CPU_AREA
def_bool PPC64
config NEED_PER_CPU_EMBED_FIRST_CHUNK
def_bool PPC64
config NR_IRQS
int "Number of virtual interrupt numbers"
range 32 32768
default "512"
help
This defines the number of virtual interrupt numbers the kernel
can manage. Virtual interrupt numbers are what you see in
/proc/interrupts. If you configure your system to have too few,
drivers will fail to load or worse - handle with care.
config NMI_IPI
bool
depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
default y
config PPC_WATCHDOG
bool
depends on HARDLOCKUP_DETECTOR
depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
default y
help
This is a placeholder when the powerpc hardlockup detector
watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
seleted via the generic lockup detector menu which is why we
have no standalone config option for it here.
config STACKTRACE_SUPPORT
bool
default y
config TRACE_IRQFLAGS_SUPPORT
bool
default y
config LOCKDEP_SUPPORT
bool
default y
config GENERIC_LOCKBREAK
bool
default y
depends on SMP && PREEMPT
config GENERIC_HWEIGHT
bool
default y
config PPC
bool
default y
#
# Please keep this list sorted alphabetically.
#
select ARCH_32BIT_OFF_T if PPC32
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV
select ARCH_HAS_HUGEPD if HUGETLB_PAGE
select ARCH_HAS_MMIOWB if PPC64
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_MEMBARRIER_CALLBACKS
select ARCH_HAS_SCALED_CPUTIME