linux-imx

# 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