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be2fc65d66
When building a 32-bit kernel, some toolchains do not allow mixing soft
float and hard float object files:
LD vmlinux.o
powerpc64le-unknown-linux-musl-ld: lib/test_fpu_impl.o uses hard float, arch/powerpc/kernel/udbg.o uses soft float
powerpc64le-unknown-linux-musl-ld: failed to merge target specific data of file lib/test_fpu_impl.o
make[2]: *** [scripts/Makefile.vmlinux_o:62: vmlinux.o] Error 1
make[1]: *** [Makefile:1152: vmlinux_o] Error 2
make: *** [Makefile:240: __sub-make] Error 2
This is not an issue when building a 64-bit kernel. To unbreak the
build, limit ARCH_HAS_KERNEL_FPU_SUPPORT to 64-bit kernels. This is okay
because the only real user of this option, amdgpu, was previously
limited to PPC64 anyway; see commit a28e4b672f ("drm/amd/display: use
ARCH_HAS_KERNEL_FPU_SUPPORT").
Fixes: 01db473e1a ("powerpc: implement ARCH_HAS_KERNEL_FPU_SUPPORT")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405250851.Z4daYSWG-lkp@intel.com/
Reported-by: Guenter Roeck <linux@roeck-us.net>
Closes: https://lore.kernel.org/lkml/eeffaec3-df63-4e55-ab7a-064a65c00efa@roeck-us.net/
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240529162852.1209-1-samuel.holland@sifive.com
1298 lines
40 KiB
Plaintext
1298 lines
40 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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source "arch/powerpc/platforms/Kconfig.cputype"
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config CC_HAS_ELFV2
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def_bool PPC64 && $(cc-option, -mabi=elfv2)
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config CC_HAS_PREFIXED
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def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)
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config CC_HAS_PCREL
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# Clang has a bug (https://github.com/llvm/llvm-project/issues/62372)
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# where pcrel code is not generated if -msoft-float, -mno-altivec, or
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# -mno-vsx options are also given. Without these options, fp/vec
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# instructions are generated from regular kernel code. So Clang can't
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# do pcrel yet.
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def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel)
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config 32BIT
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bool
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default y if PPC32
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config 64BIT
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bool
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default y if PPC64
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config LIVEPATCH_64
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def_bool PPC64
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depends on LIVEPATCH
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config MMU
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bool
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default y
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config ARCH_MMAP_RND_BITS_MAX
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# On Book3S 64, the default virtual address space for 64-bit processes
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# is 2^47 (128TB). As a maximum, allow randomisation to consume up to
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# 32T of address space (2^45), which should ensure a reasonable gap
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# between bottom-up and top-down allocations for applications that
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# consume "normal" amounts of address space. Book3S 64 only supports 64K
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# and 4K page sizes.
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default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
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default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
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#
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# On all other 64-bit platforms (currently only Book3E), the virtual
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# address space is 2^46 (64TB). Allow randomisation to consume up to 16T
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# of address space (2^44). Only 4K page sizes are supported.
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default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
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#
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# For 32-bit, use the compat values, as they're the same.
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default ARCH_MMAP_RND_COMPAT_BITS_MAX
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config ARCH_MMAP_RND_BITS_MIN
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# Allow randomisation to consume up to 1GB of address space (2^30).
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default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
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default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
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#
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# For 32-bit, use the compat values, as they're the same.
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default ARCH_MMAP_RND_COMPAT_BITS_MIN
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config ARCH_MMAP_RND_COMPAT_BITS_MAX
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# Total virtual address space for 32-bit processes is 2^31 (2GB).
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# Allow randomisation to consume up to 512MB of address space (2^29).
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default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
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default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
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default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
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default 17 # 17 = 29 (512MB) - 12 (4K)
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config ARCH_MMAP_RND_COMPAT_BITS_MIN
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# Total virtual address space for 32-bit processes is 2^31 (2GB).
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# Allow randomisation to consume up to 8MB of address space (2^23).
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default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
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default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
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default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
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default 11 # 11 = 23 (8MB) - 12 (4K)
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config NR_IRQS
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int "Number of virtual interrupt numbers"
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range 32 1048576
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default "512"
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help
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This defines the number of virtual interrupt numbers the kernel
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can manage. Virtual interrupt numbers are what you see in
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/proc/interrupts. If you configure your system to have too few,
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drivers will fail to load or worse - handle with care.
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config NMI_IPI
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bool
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depends on SMP && (DEBUGGER || KEXEC_CORE || HARDLOCKUP_DETECTOR)
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default y
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config PPC_WATCHDOG
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bool
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depends on HARDLOCKUP_DETECTOR_ARCH
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default y
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help
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This is a placeholder when the powerpc hardlockup detector
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watchdog is selected (arch/powerpc/kernel/watchdog.c). It is
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selected via the generic lockup detector menu which is why we
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have no standalone config option for it here.
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config STACKTRACE_SUPPORT
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bool
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default y
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config LOCKDEP_SUPPORT
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bool
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default y
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config GENERIC_LOCKBREAK
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bool
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default y
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depends on SMP && PREEMPTION && !PPC_QUEUED_SPINLOCKS
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config GENERIC_HWEIGHT
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bool
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default y
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config PPC
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bool
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default y
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#
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# Please keep this list sorted alphabetically.
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#
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select ARCH_32BIT_OFF_T if PPC32
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select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
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select ARCH_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
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select ARCH_ENABLE_MEMORY_HOTPLUG
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select ARCH_ENABLE_MEMORY_HOTREMOVE
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select ARCH_HAS_COPY_MC if PPC64
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select ARCH_HAS_CURRENT_STACK_POINTER
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select ARCH_HAS_DEBUG_VIRTUAL
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select ARCH_HAS_DEBUG_VM_PGTABLE
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select ARCH_HAS_DEBUG_WX if STRICT_KERNEL_RWX
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select ARCH_HAS_DEVMEM_IS_ALLOWED
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select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
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select ARCH_HAS_FORTIFY_SOURCE
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select ARCH_HAS_GCOV_PROFILE_ALL
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select ARCH_HAS_HUGEPD if HUGETLB_PAGE
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select ARCH_HAS_KCOV
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select ARCH_HAS_KERNEL_FPU_SUPPORT if PPC64 && PPC_FPU
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select ARCH_HAS_MEMBARRIER_CALLBACKS
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select ARCH_HAS_MEMBARRIER_SYNC_CORE
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select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU
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select ARCH_HAS_MMIOWB if PPC64
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select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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select ARCH_HAS_PHYS_TO_DMA
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select ARCH_HAS_PMEM_API
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select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64
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select ARCH_HAS_PTE_SPECIAL
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select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
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select ARCH_HAS_SET_MEMORY
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select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S || PPC_8xx || 40x) && !HIBERNATION
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select ARCH_HAS_STRICT_KERNEL_RWX if PPC_85xx && !HIBERNATION && !RANDOMIZE_BASE
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select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
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select ARCH_HAS_SYSCALL_WRAPPER if !SPU_BASE && !COMPAT
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select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
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select ARCH_HAS_UACCESS_FLUSHCACHE
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select ARCH_HAS_UBSAN
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select ARCH_HAVE_NMI_SAFE_CMPXCHG
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select ARCH_HAVE_EXTRA_ELF_NOTES if SPU_BASE
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select ARCH_KEEP_MEMBLOCK
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select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if PPC_RADIX_MMU
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select ARCH_MIGHT_HAVE_PC_PARPORT
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select ARCH_MIGHT_HAVE_PC_SERIO
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select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
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select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
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select ARCH_SPLIT_ARG64 if PPC32
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select ARCH_STACKWALK
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select ARCH_SUPPORTS_ATOMIC_RMW
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select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x
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select ARCH_USE_BUILTIN_BSWAP
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select ARCH_USE_CMPXCHG_LOCKREF if PPC64
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select ARCH_USE_MEMTEST
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select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
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select ARCH_WANT_DEFAULT_BPF_JIT
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select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
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select ARCH_WANT_IPC_PARSE_VERSION
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select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
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select ARCH_WANT_LD_ORPHAN_WARN
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select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP if PPC_RADIX_MMU
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select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 || PPC_8xx
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select ARCH_WEAK_RELEASE_ACQUIRE
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select BINFMT_ELF
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select BUILDTIME_TABLE_SORT
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select CLONE_BACKWARDS
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select CPUMASK_OFFSTACK if NR_CPUS >= 8192
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select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
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select DMA_OPS_BYPASS if PPC64
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select DMA_OPS if PPC64
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select DYNAMIC_FTRACE if FUNCTION_TRACER
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select EDAC_ATOMIC_SCRUB
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select EDAC_SUPPORT
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select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if ARCH_USING_PATCHABLE_FUNCTION_ENTRY
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select FUNCTION_ALIGNMENT_4B
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select GENERIC_ATOMIC64 if PPC32
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select GENERIC_CLOCKEVENTS_BROADCAST if SMP
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select GENERIC_CMOS_UPDATE
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select GENERIC_CPU_AUTOPROBE
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select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
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select GENERIC_EARLY_IOREMAP
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select GENERIC_GETTIMEOFDAY
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select GENERIC_IDLE_POLL_SETUP
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select GENERIC_IOREMAP
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select GENERIC_IRQ_SHOW
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select GENERIC_IRQ_SHOW_LEVEL
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select GENERIC_PCI_IOMAP if PCI
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select GENERIC_PTDUMP
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_TIME_VSYSCALL
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select GENERIC_VDSO_TIME_NS
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select HAS_IOPORT if PCI
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
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select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
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select HAVE_ARCH_JUMP_LABEL
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select HAVE_ARCH_JUMP_LABEL_RELATIVE
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select HAVE_ARCH_KASAN if PPC32 && PAGE_SHIFT <= 14
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select HAVE_ARCH_KASAN if PPC_RADIX_MMU
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select HAVE_ARCH_KASAN if PPC_BOOK3E_64
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select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
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select HAVE_ARCH_KCSAN
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select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
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select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
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select HAVE_ARCH_WITHIN_STACK_FRAMES
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_MMAP_RND_BITS
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select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
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select HAVE_ARCH_NVRAM_OPS
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select HAVE_ARCH_SECCOMP_FILTER
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select HAVE_ARCH_TRACEHOOK
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select HAVE_ASM_MODVERSIONS
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select HAVE_CONTEXT_TRACKING_USER
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select HAVE_C_RECORDMCOUNT
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select HAVE_DEBUG_KMEMLEAK
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select HAVE_DEBUG_STACKOVERFLOW
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select HAVE_DYNAMIC_FTRACE
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select HAVE_DYNAMIC_FTRACE_WITH_ARGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
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select HAVE_DYNAMIC_FTRACE_WITH_REGS if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
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select HAVE_EBPF_JIT
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select HAVE_EFFICIENT_UNALIGNED_ACCESS
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select HAVE_GUP_FAST
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select HAVE_FTRACE_MCOUNT_RECORD
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select HAVE_FUNCTION_ARG_ACCESS_API
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select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
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select HAVE_FUNCTION_ERROR_INJECTION
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_FUNCTION_TRACER if PPC64 || (PPC32 && CC_IS_GCC)
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select HAVE_GCC_PLUGINS if GCC_VERSION >= 50200 # plugin support on gcc <= 5.1 is buggy on PPC
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select HAVE_GENERIC_VDSO
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select HAVE_HARDLOCKUP_DETECTOR_ARCH if PPC_BOOK3S_64 && SMP
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select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
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select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
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select HAVE_IOREMAP_PROT
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select HAVE_IRQ_TIME_ACCOUNTING
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select HAVE_KERNEL_GZIP
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select HAVE_KERNEL_LZMA if DEFAULT_UIMAGE
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select HAVE_KERNEL_LZO if DEFAULT_UIMAGE
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select HAVE_KERNEL_XZ if PPC_BOOK3S || 44x
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select HAVE_KPROBES
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select HAVE_KPROBES_ON_FTRACE
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select HAVE_KRETPROBES
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select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if HAVE_OBJTOOL_MCOUNT && (!ARCH_USING_PATCHABLE_FUNCTION_ENTRY || (!CC_IS_GCC || GCC_VERSION >= 110100))
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select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
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select HAVE_MOD_ARCH_SPECIFIC
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select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
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select HAVE_OPTPROBES
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select HAVE_OBJTOOL if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
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select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
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select HAVE_PERF_EVENTS
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select HAVE_PERF_EVENTS_NMI if PPC64
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select HAVE_PERF_REGS
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select HAVE_PERF_USER_STACK_DUMP
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select HAVE_REGS_AND_STACK_ACCESS_API
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select HAVE_RELIABLE_STACKTRACE
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select HAVE_RSEQ
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select HAVE_SETUP_PER_CPU_AREA if PPC64
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select HAVE_SOFTIRQ_ON_OWN_STACK
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select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
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select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
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select HAVE_STATIC_CALL if PPC32
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select HAVE_SYSCALL_TRACEPOINTS
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select HAVE_VIRT_CPU_ACCOUNTING
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select HAVE_VIRT_CPU_ACCOUNTING_GEN
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select HOTPLUG_SMT if HOTPLUG_CPU
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select SMT_NUM_THREADS_DYNAMIC
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select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
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select IOMMU_HELPER if PPC64
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select IRQ_DOMAIN
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select IRQ_FORCED_THREADING
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select KASAN_VMALLOC if KASAN && EXECMEM
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select LOCK_MM_AND_FIND_VMA
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select MMU_GATHER_PAGE_SIZE
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select MMU_GATHER_RCU_TABLE_FREE
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select MMU_GATHER_MERGE_VMAS
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select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64
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select MODULES_USE_ELF_RELA
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select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
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select NEED_PER_CPU_EMBED_FIRST_CHUNK if PPC64
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select NEED_PER_CPU_PAGE_FIRST_CHUNK if PPC64
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select NEED_SG_DMA_LENGTH
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select OF
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select OF_EARLY_FLATTREE
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select OLD_SIGACTION if PPC32
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select OLD_SIGSUSPEND
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select PCI_DOMAINS if PCI
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select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
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select PCI_SYSCALL if PCI
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select PPC_DAWR if PPC64
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select RTC_LIB
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select SPARSE_IRQ
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select STRICT_KERNEL_RWX if STRICT_MODULE_RWX
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select SYSCTL_EXCEPTION_TRACE
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select THREAD_INFO_IN_TASK
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select TRACE_IRQFLAGS_SUPPORT
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#
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# Please keep this list sorted alphabetically.
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#
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config PPC_BARRIER_NOSPEC
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bool
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default y
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depends on PPC_BOOK3S_64 || PPC_E500
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config PPC_HAS_LBARX_LHARX
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bool
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config EARLY_PRINTK
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bool
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default y
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config PANIC_TIMEOUT
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int
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default 180
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config COMPAT
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bool "Enable support for 32bit binaries"
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depends on PPC64
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default y if !CPU_LITTLE_ENDIAN
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select ARCH_WANT_OLD_COMPAT_IPC
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select COMPAT_OLD_SIGACTION
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config SCHED_OMIT_FRAME_POINTER
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bool
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default y
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config ARCH_MAY_HAVE_PC_FDC
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bool
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default PCI
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config PPC_UDBG_16550
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bool
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config GENERIC_TBSYNC
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bool
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default y if PPC32 && SMP
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config AUDIT_ARCH
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bool
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default y
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config GENERIC_BUG
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bool
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default y
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depends on BUG
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config GENERIC_BUG_RELATIVE_POINTERS
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def_bool y
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depends on GENERIC_BUG
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config SYS_SUPPORTS_APM_EMULATION
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default y if PMAC_APM_EMU
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bool
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config EPAPR_BOOT
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bool
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help
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Used to allow a board to specify it wants an ePAPR compliant wrapper.
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config DEFAULT_UIMAGE
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bool
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help
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Used to allow a board to specify it wants a uImage built by default
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config ARCH_HIBERNATION_POSSIBLE
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bool
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default y
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config ARCH_SUSPEND_POSSIBLE
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def_bool y
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depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
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(PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
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|| 44x || 40x
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config ARCH_SUSPEND_NONZERO_CPU
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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 40x || 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 4xx || 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/gcc-check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN
|
|
def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN
|
|
|
|
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_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 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_BOOK3S_32 || (PPC_8xx && !PIN_TLB_DATA && !STRICT_KERNEL_RWX) || \
|
|
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 19 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 && PPC_8xx
|
|
default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
|
|
default 19 if (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 (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 SCHED_SMT
|
|
bool "SMT (Hyperthreading) scheduler support"
|
|
depends on PPC64 && SMP
|
|
help
|
|
SMT scheduler support improves the CPU scheduler's decision making
|
|
when dealing with POWER5 cpus at a cost of slightly increased
|
|
overhead in some places. If unsure say N here.
|
|
|
|
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" if 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 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
|
|
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 40x || 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 || 40x)
|
|
help
|
|
PPC4xx Clock Power Management (CPM) support (suspend/resume).
|
|
It also enables support for two different idle states (idle-wait
|
|
and idle-doze).
|
|
|
|
config 4xx_SOC
|
|
bool
|
|
|
|
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 user task space" if TASK_SIZE_BOOL
|
|
default "0x80000000" if PPC_8xx
|
|
default "0xb0000000" if PPC_BOOK3S_32
|
|
default "0xc0000000"
|
|
endmenu
|
|
|
|
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"
|