744 lines
22 KiB
Plaintext
744 lines
22 KiB
Plaintext
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# SPDX-License-Identifier: GPL-2.0-only
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#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.rst.
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#
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config 64BIT
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bool
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config 32BIT
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bool
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config RISCV
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def_bool y
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select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
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select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
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select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
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select ARCH_HAS_BINFMT_FLAT
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select ARCH_HAS_CURRENT_STACK_POINTER
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select ARCH_HAS_DEBUG_VIRTUAL if MMU
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select ARCH_HAS_DEBUG_VM_PGTABLE
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select ARCH_HAS_DEBUG_WX
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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_GIGANTIC_PAGE
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select ARCH_HAS_KCOV
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select ARCH_HAS_MMIOWB
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select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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select ARCH_HAS_PMEM_API
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select ARCH_HAS_PTE_SPECIAL
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select ARCH_HAS_SET_DIRECT_MAP if MMU
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select ARCH_HAS_SET_MEMORY if MMU
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select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
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select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL
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select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
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select ARCH_HAS_UBSAN_SANITIZE_ALL
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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_STACKWALK
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select ARCH_SUPPORTS_ATOMIC_RMW
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select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU
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select ARCH_SUPPORTS_HUGETLBFS if MMU
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select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU
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select ARCH_USE_MEMTEST
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select ARCH_USE_QUEUED_RWLOCKS
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select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
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select ARCH_WANT_FRAME_POINTERS
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select ARCH_WANT_GENERAL_HUGETLB
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select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
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select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
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select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL
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select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
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select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
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select BUILDTIME_TABLE_SORT if MMU
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select CLINT_TIMER if !MMU
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select CLONE_BACKWARDS
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select COMMON_CLK
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select CPU_PM if CPU_IDLE
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select EDAC_SUPPORT
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select GENERIC_ARCH_TOPOLOGY
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select GENERIC_ATOMIC64 if !64BIT
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select GENERIC_CLOCKEVENTS_BROADCAST if SMP
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select GENERIC_EARLY_IOREMAP
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select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO
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select GENERIC_IDLE_POLL_SETUP
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select GENERIC_IOREMAP if MMU
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select GENERIC_IRQ_MULTI_HANDLER
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select GENERIC_IRQ_SHOW
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select GENERIC_IRQ_SHOW_LEVEL
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select GENERIC_LIB_DEVMEM_IS_ALLOWED
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select GENERIC_PCI_IOMAP
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select GENERIC_PTDUMP if MMU
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select GENERIC_SCHED_CLOCK
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_TIME_VSYSCALL if MMU && 64BIT
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select GENERIC_VDSO_TIME_NS if HAVE_GENERIC_VDSO
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select HARDIRQS_SW_RESEND
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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 MMU && 64BIT && !XIP_KERNEL
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select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
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select HAVE_ARCH_JUMP_LABEL_RELATIVE if !XIP_KERNEL
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select HAVE_ARCH_KASAN if MMU && 64BIT
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select HAVE_ARCH_KASAN_VMALLOC if MMU && 64BIT
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select HAVE_ARCH_KFENCE if MMU && 64BIT
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select HAVE_ARCH_KGDB if !XIP_KERNEL
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select HAVE_ARCH_KGDB_QXFER_PKT
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select HAVE_ARCH_MMAP_RND_BITS if MMU
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select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
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select HAVE_ARCH_SECCOMP_FILTER
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select HAVE_ARCH_THREAD_STRUCT_WHITELIST
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select HAVE_ARCH_TRACEHOOK
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select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
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select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
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select HAVE_ASM_MODVERSIONS
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select HAVE_CONTEXT_TRACKING_USER
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select HAVE_DEBUG_KMEMLEAK
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select HAVE_DMA_CONTIGUOUS if MMU
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select HAVE_EBPF_JIT if MMU
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select HAVE_FUNCTION_ARG_ACCESS_API
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select HAVE_FUNCTION_ERROR_INJECTION
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select HAVE_GCC_PLUGINS
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select HAVE_GENERIC_VDSO if MMU && 64BIT
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select HAVE_IRQ_TIME_ACCOUNTING
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select HAVE_KPROBES if !XIP_KERNEL
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select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
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select HAVE_KRETPROBES if !XIP_KERNEL
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select HAVE_RETHOOK if !XIP_KERNEL
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select HAVE_MOVE_PMD
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select HAVE_MOVE_PUD
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select HAVE_PCI
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select HAVE_PERF_EVENTS
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select HAVE_PERF_REGS
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select HAVE_PERF_USER_STACK_DUMP
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select HAVE_POSIX_CPU_TIMERS_TASK_WORK
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select HAVE_REGS_AND_STACK_ACCESS_API
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select HAVE_RSEQ
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select HAVE_STACKPROTECTOR
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select HAVE_SYSCALL_TRACEPOINTS
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select IRQ_DOMAIN
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select IRQ_FORCED_THREADING
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select MODULES_USE_ELF_RELA if MODULES
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select MODULE_SECTIONS if MODULES
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select OF
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select OF_DMA_DEFAULT_COHERENT
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select OF_EARLY_FLATTREE
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select OF_IRQ
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select PCI_DOMAINS_GENERIC if PCI
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select PCI_MSI if PCI
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select RISCV_ALTERNATIVE if !XIP_KERNEL
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select RISCV_INTC
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select RISCV_TIMER if RISCV_SBI
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select SIFIVE_PLIC
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select SPARSE_IRQ
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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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select UACCESS_MEMCPY if !MMU
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select ZONE_DMA32 if 64BIT
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select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8)
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select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
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select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
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config ARCH_MMAP_RND_BITS_MIN
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default 18 if 64BIT
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default 8
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config ARCH_MMAP_RND_COMPAT_BITS_MIN
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default 8
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# max bits determined by the following formula:
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# VA_BITS - PAGE_SHIFT - 3
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config ARCH_MMAP_RND_BITS_MAX
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default 24 if 64BIT # SV39 based
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default 17
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config ARCH_MMAP_RND_COMPAT_BITS_MAX
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default 17
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# set if we run in machine mode, cleared if we run in supervisor mode
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config RISCV_M_MODE
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bool
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default !MMU
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# set if we are running in S-mode and can use SBI calls
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config RISCV_SBI
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bool
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depends on !RISCV_M_MODE
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default y
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config MMU
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bool "MMU-based Paged Memory Management Support"
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default y
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help
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Select if you want MMU-based virtualised addressing space
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support by paged memory management. If unsure, say 'Y'.
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config PAGE_OFFSET
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hex
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default 0xC0000000 if 32BIT
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default 0x80000000 if 64BIT && !MMU
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default 0xff60000000000000 if 64BIT
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config KASAN_SHADOW_OFFSET
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hex
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depends on KASAN_GENERIC
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default 0xdfffffff00000000 if 64BIT
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default 0xffffffff if 32BIT
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config ARCH_FLATMEM_ENABLE
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def_bool !NUMA
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config ARCH_SPARSEMEM_ENABLE
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def_bool y
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depends on MMU
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select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
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select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
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config ARCH_SELECT_MEMORY_MODEL
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def_bool ARCH_SPARSEMEM_ENABLE
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config ARCH_SUPPORTS_UPROBES
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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config GENERIC_BUG
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def_bool y
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depends on BUG
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select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
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config GENERIC_BUG_RELATIVE_POINTERS
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bool
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config GENERIC_CALIBRATE_DELAY
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def_bool y
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config GENERIC_CSUM
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def_bool y
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config GENERIC_HWEIGHT
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def_bool y
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config FIX_EARLYCON_MEM
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def_bool MMU
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config PGTABLE_LEVELS
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int
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default 5 if 64BIT
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default 2
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config LOCKDEP_SUPPORT
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def_bool y
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config RISCV_DMA_NONCOHERENT
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bool
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select ARCH_HAS_DMA_PREP_COHERENT
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select ARCH_HAS_SETUP_DMA_OPS
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select ARCH_HAS_SYNC_DMA_FOR_CPU
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE
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select DMA_DIRECT_REMAP
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config AS_HAS_INSN
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def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
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source "arch/riscv/Kconfig.socs"
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source "arch/riscv/Kconfig.erratas"
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menu "Platform type"
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config NONPORTABLE
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bool "Allow configurations that result in non-portable kernels"
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help
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RISC-V kernel binaries are compatible between all known systems
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whenever possible, but there are some use cases that can only be
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satisfied by configurations that result in kernel binaries that are
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not portable between systems.
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Selecting N does not guarantee kernels will be portable to all known
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systems. Selecting any of the options guarded by NONPORTABLE will
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result in kernel binaries that are unlikely to be portable between
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systems.
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If unsure, say N.
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choice
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prompt "Base ISA"
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default ARCH_RV64I
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help
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This selects the base ISA that this kernel will target and must match
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the target platform.
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config ARCH_RV32I
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bool "RV32I"
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depends on NONPORTABLE
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select 32BIT
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select GENERIC_LIB_ASHLDI3
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select GENERIC_LIB_ASHRDI3
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select GENERIC_LIB_LSHRDI3
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select GENERIC_LIB_UCMPDI2
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select MMU
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config ARCH_RV64I
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bool "RV64I"
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select 64BIT
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select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
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select SWIOTLB if MMU
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endchoice
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# We must be able to map all physical memory into the kernel, but the compiler
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# is still a bit more efficient when generating code if it's setup in a manner
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# such that it can only map 2GiB of memory.
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choice
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prompt "Kernel Code Model"
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default CMODEL_MEDLOW if 32BIT
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default CMODEL_MEDANY if 64BIT
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config CMODEL_MEDLOW
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bool "medium low code model"
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config CMODEL_MEDANY
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bool "medium any code model"
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endchoice
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config MODULE_SECTIONS
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bool
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select HAVE_MOD_ARCH_SPECIFIC
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config SMP
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bool "Symmetric Multi-Processing"
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help
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This enables support for systems with more than one CPU. If
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you say N here, the kernel will run on single and
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multiprocessor machines, but will use only one CPU of a
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multiprocessor machine. If you say Y here, the kernel will run
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on many, but not all, single processor machines. On a single
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processor machine, the kernel will run faster if you say N
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here.
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If you don't know what to do here, say N.
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config NR_CPUS
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int "Maximum number of CPUs (2-512)"
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depends on SMP
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range 2 512 if !RISCV_SBI_V01
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range 2 32 if RISCV_SBI_V01 && 32BIT
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range 2 64 if RISCV_SBI_V01 && 64BIT
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default "32" if 32BIT
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default "64" if 64BIT
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config HOTPLUG_CPU
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bool "Support for hot-pluggable CPUs"
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depends on SMP
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select GENERIC_IRQ_MIGRATION
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help
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Say Y here to experiment with turning CPUs off and on. CPUs
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can be controlled through /sys/devices/system/cpu.
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Say N if you want to disable CPU hotplug.
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choice
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prompt "CPU Tuning"
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default TUNE_GENERIC
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config TUNE_GENERIC
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bool "generic"
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endchoice
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# Common NUMA Features
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config NUMA
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bool "NUMA Memory Allocation and Scheduler Support"
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depends on SMP && MMU
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select ARCH_SUPPORTS_NUMA_BALANCING
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select GENERIC_ARCH_NUMA
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select NEED_PER_CPU_EMBED_FIRST_CHUNK
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select OF_NUMA
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select USE_PERCPU_NUMA_NODE_ID
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help
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|
|
Enable NUMA (Non-Uniform Memory Access) support.
|
||
|
|
|
||
|
|
The kernel will try to allocate memory used by a CPU on the
|
||
|
|
local memory of the CPU and add some more NUMA awareness to the kernel.
|
||
|
|
|
||
|
|
config NODES_SHIFT
|
||
|
|
int "Maximum NUMA Nodes (as a power of 2)"
|
||
|
|
range 1 10
|
||
|
|
default "2"
|
||
|
|
depends on NUMA
|
||
|
|
help
|
||
|
|
Specify the maximum number of NUMA Nodes available on the target
|
||
|
|
system. Increases memory reserved to accommodate various tables.
|
||
|
|
|
||
|
|
config RISCV_ALTERNATIVE
|
||
|
|
bool
|
||
|
|
depends on !XIP_KERNEL
|
||
|
|
help
|
||
|
|
This Kconfig allows the kernel to automatically patch the
|
||
|
|
errata required by the execution platform at run time. The
|
||
|
|
code patching is performed once in the boot stages. It means
|
||
|
|
that the overhead from this mechanism is just taken once.
|
||
|
|
|
||
|
|
config RISCV_ALTERNATIVE_EARLY
|
||
|
|
bool
|
||
|
|
depends on RISCV_ALTERNATIVE
|
||
|
|
help
|
||
|
|
Allows early patching of the kernel for special errata
|
||
|
|
|
||
|
|
config RISCV_ISA_C
|
||
|
|
bool "Emit compressed instructions when building Linux"
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Adds "C" to the ISA subsets that the toolchain is allowed to emit
|
||
|
|
when building Linux, which results in compressed instructions in the
|
||
|
|
Linux binary.
|
||
|
|
|
||
|
|
If you don't know what to do here, say Y.
|
||
|
|
|
||
|
|
config RISCV_ISA_SVPBMT
|
||
|
|
bool "SVPBMT extension support"
|
||
|
|
depends on 64BIT && MMU
|
||
|
|
depends on RISCV_ALTERNATIVE
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Adds support to dynamically detect the presence of the SVPBMT
|
||
|
|
ISA-extension (Supervisor-mode: page-based memory types) and
|
||
|
|
enable its usage.
|
||
|
|
|
||
|
|
The memory type for a page contains a combination of attributes
|
||
|
|
that indicate the cacheability, idempotency, and ordering
|
||
|
|
properties for access to that page.
|
||
|
|
|
||
|
|
The SVPBMT extension is only available on 64Bit cpus.
|
||
|
|
|
||
|
|
If you don't know what to do here, say Y.
|
||
|
|
|
||
|
|
config TOOLCHAIN_HAS_ZBB
|
||
|
|
bool
|
||
|
|
default y
|
||
|
|
depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
|
||
|
|
depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
|
||
|
|
depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
|
||
|
|
depends on AS_IS_GNU
|
||
|
|
|
||
|
|
config RISCV_ISA_ZBB
|
||
|
|
bool "Zbb extension support for bit manipulation instructions"
|
||
|
|
depends on TOOLCHAIN_HAS_ZBB
|
||
|
|
depends on MMU
|
||
|
|
depends on RISCV_ALTERNATIVE
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Adds support to dynamically detect the presence of the ZBB
|
||
|
|
extension (basic bit manipulation) and enable its usage.
|
||
|
|
|
||
|
|
The Zbb extension provides instructions to accelerate a number
|
||
|
|
of bit-specific operations (count bit population, sign extending,
|
||
|
|
bitrotation, etc).
|
||
|
|
|
||
|
|
If you don't know what to do here, say Y.
|
||
|
|
|
||
|
|
config RISCV_ISA_ZICBOM
|
||
|
|
bool "Zicbom extension support for non-coherent DMA operation"
|
||
|
|
depends on MMU
|
||
|
|
depends on RISCV_ALTERNATIVE
|
||
|
|
default y
|
||
|
|
select RISCV_DMA_NONCOHERENT
|
||
|
|
help
|
||
|
|
Adds support to dynamically detect the presence of the ZICBOM
|
||
|
|
extension (Cache Block Management Operations) and enable its
|
||
|
|
usage.
|
||
|
|
|
||
|
|
The Zicbom extension can be used to handle for example
|
||
|
|
non-coherent DMA support on devices that need it.
|
||
|
|
|
||
|
|
If you don't know what to do here, say Y.
|
||
|
|
|
||
|
|
config TOOLCHAIN_HAS_ZIHINTPAUSE
|
||
|
|
bool
|
||
|
|
default y
|
||
|
|
depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zihintpause)
|
||
|
|
depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zihintpause)
|
||
|
|
depends on LLD_VERSION >= 150000 || LD_VERSION >= 23600
|
||
|
|
|
||
|
|
config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
|
||
|
|
def_bool y
|
||
|
|
# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
|
||
|
|
depends on AS_IS_GNU && AS_VERSION >= 23800
|
||
|
|
help
|
||
|
|
Newer binutils versions default to ISA spec version 20191213 which
|
||
|
|
moves some instructions from the I extension to the Zicsr and Zifencei
|
||
|
|
extensions.
|
||
|
|
|
||
|
|
config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
|
||
|
|
def_bool y
|
||
|
|
depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
|
||
|
|
# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
|
||
|
|
depends on CC_IS_CLANG && CLANG_VERSION < 170000
|
||
|
|
help
|
||
|
|
Certain versions of clang do not support zicsr and zifencei via -march
|
||
|
|
but newer versions of binutils require it for the reasons noted in the
|
||
|
|
help text of CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI. This
|
||
|
|
option causes an older ISA spec compatible with these older versions
|
||
|
|
of clang to be passed to GAS, which has the same result as passing zicsr
|
||
|
|
and zifencei to -march.
|
||
|
|
|
||
|
|
config FPU
|
||
|
|
bool "FPU support"
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Say N here if you want to disable all floating-point related procedure
|
||
|
|
in the kernel.
|
||
|
|
|
||
|
|
If you don't know what to do here, say Y.
|
||
|
|
|
||
|
|
endmenu # "Platform type"
|
||
|
|
|
||
|
|
menu "Kernel features"
|
||
|
|
|
||
|
|
source "kernel/Kconfig.hz"
|
||
|
|
|
||
|
|
config RISCV_SBI_V01
|
||
|
|
bool "SBI v0.1 support"
|
||
|
|
depends on RISCV_SBI
|
||
|
|
help
|
||
|
|
This config allows kernel to use SBI v0.1 APIs. This will be
|
||
|
|
deprecated in future once legacy M-mode software are no longer in use.
|
||
|
|
|
||
|
|
config RISCV_BOOT_SPINWAIT
|
||
|
|
bool "Spinwait booting method"
|
||
|
|
depends on SMP
|
||
|
|
default y if RISCV_SBI_V01 || RISCV_M_MODE
|
||
|
|
help
|
||
|
|
This enables support for booting Linux via spinwait method. In the
|
||
|
|
spinwait method, all cores randomly jump to Linux. One of the cores
|
||
|
|
gets chosen via lottery and all other keep spinning on a percpu
|
||
|
|
variable. This method cannot support CPU hotplug and sparse hartid
|
||
|
|
scheme. It should be only enabled for M-mode Linux or platforms relying
|
||
|
|
on older firmware without SBI HSM extension. All other platforms should
|
||
|
|
rely on ordered booting via SBI HSM extension which gets chosen
|
||
|
|
dynamically at runtime if the firmware supports it.
|
||
|
|
|
||
|
|
Since spinwait is incompatible with sparse hart IDs, it requires
|
||
|
|
NR_CPUS be large enough to contain the physical hart ID of the first
|
||
|
|
hart to enter Linux.
|
||
|
|
|
||
|
|
If unsure what to do here, say N.
|
||
|
|
|
||
|
|
config KEXEC
|
||
|
|
bool "Kexec system call"
|
||
|
|
depends on MMU
|
||
|
|
select HOTPLUG_CPU if SMP
|
||
|
|
select KEXEC_CORE
|
||
|
|
help
|
||
|
|
kexec is a system call that implements the ability to shutdown your
|
||
|
|
current kernel, and to start another kernel. It is like a reboot
|
||
|
|
but it is independent of the system firmware. And like a reboot
|
||
|
|
you can start any kernel with it, not just Linux.
|
||
|
|
|
||
|
|
The name comes from the similarity to the exec system call.
|
||
|
|
|
||
|
|
config KEXEC_FILE
|
||
|
|
bool "kexec file based systmem call"
|
||
|
|
depends on 64BIT && MMU
|
||
|
|
select HAVE_IMA_KEXEC if IMA
|
||
|
|
select KEXEC_CORE
|
||
|
|
select KEXEC_ELF
|
||
|
|
help
|
||
|
|
This is new version of kexec system call. This system call is
|
||
|
|
file based and takes file descriptors as system call argument
|
||
|
|
for kernel and initramfs as opposed to list of segments as
|
||
|
|
accepted by previous system call.
|
||
|
|
|
||
|
|
If you don't know what to do here, say Y.
|
||
|
|
|
||
|
|
config ARCH_HAS_KEXEC_PURGATORY
|
||
|
|
def_bool KEXEC_FILE
|
||
|
|
depends on CRYPTO=y
|
||
|
|
depends on CRYPTO_SHA256=y
|
||
|
|
|
||
|
|
config CRASH_DUMP
|
||
|
|
bool "Build kdump crash kernel"
|
||
|
|
help
|
||
|
|
Generate crash dump after being started by kexec. This should
|
||
|
|
be normally only set in special crash dump kernels which are
|
||
|
|
loaded in the main kernel with kexec-tools into a specially
|
||
|
|
reserved region and then later executed after a crash by
|
||
|
|
kdump/kexec.
|
||
|
|
|
||
|
|
For more details see Documentation/admin-guide/kdump/kdump.rst
|
||
|
|
|
||
|
|
config COMPAT
|
||
|
|
bool "Kernel support for 32-bit U-mode"
|
||
|
|
default 64BIT
|
||
|
|
depends on 64BIT && MMU
|
||
|
|
help
|
||
|
|
This option enables support for a 32-bit U-mode running under a 64-bit
|
||
|
|
kernel at S-mode. riscv32-specific components such as system calls,
|
||
|
|
the user helper functions (vdso), signal rt_frame functions and the
|
||
|
|
ptrace interface are handled appropriately by the kernel.
|
||
|
|
|
||
|
|
If you want to execute 32-bit userspace applications, say Y.
|
||
|
|
|
||
|
|
endmenu # "Kernel features"
|
||
|
|
|
||
|
|
menu "Boot options"
|
||
|
|
|
||
|
|
config CMDLINE
|
||
|
|
string "Built-in kernel command line"
|
||
|
|
help
|
||
|
|
For most platforms, the arguments for the kernel's command line
|
||
|
|
are provided at run-time, during boot. However, there are cases
|
||
|
|
where either no arguments are being provided or the provided
|
||
|
|
arguments are insufficient or even invalid.
|
||
|
|
|
||
|
|
When that occurs, it is possible to define a built-in command
|
||
|
|
line here and choose how the kernel should use it later on.
|
||
|
|
|
||
|
|
choice
|
||
|
|
prompt "Built-in command line usage" if CMDLINE != ""
|
||
|
|
default CMDLINE_FALLBACK
|
||
|
|
help
|
||
|
|
Choose how the kernel will handle the provided built-in command
|
||
|
|
line.
|
||
|
|
|
||
|
|
config CMDLINE_FALLBACK
|
||
|
|
bool "Use bootloader kernel arguments if available"
|
||
|
|
help
|
||
|
|
Use the built-in command line as fallback in case we get nothing
|
||
|
|
during boot. This is the default behaviour.
|
||
|
|
|
||
|
|
config CMDLINE_EXTEND
|
||
|
|
bool "Extend bootloader kernel arguments"
|
||
|
|
help
|
||
|
|
The command-line arguments provided during boot will be
|
||
|
|
appended to the built-in command line. This is useful in
|
||
|
|
cases where the provided arguments are insufficient and
|
||
|
|
you don't want to or cannot modify them.
|
||
|
|
|
||
|
|
config CMDLINE_FORCE
|
||
|
|
bool "Always use the default kernel command string"
|
||
|
|
help
|
||
|
|
Always use the built-in command line, even if we get one during
|
||
|
|
boot. This is useful in case you need to override the provided
|
||
|
|
command line on systems where you don't have or want control
|
||
|
|
over it.
|
||
|
|
|
||
|
|
endchoice
|
||
|
|
|
||
|
|
config EFI_STUB
|
||
|
|
bool
|
||
|
|
|
||
|
|
config EFI
|
||
|
|
bool "UEFI runtime support"
|
||
|
|
depends on OF && !XIP_KERNEL
|
||
|
|
depends on MMU
|
||
|
|
default y
|
||
|
|
select EFI_GENERIC_STUB
|
||
|
|
select EFI_PARAMS_FROM_FDT
|
||
|
|
select EFI_RUNTIME_WRAPPERS
|
||
|
|
select EFI_STUB
|
||
|
|
select LIBFDT
|
||
|
|
select RISCV_ISA_C
|
||
|
|
select UCS2_STRING
|
||
|
|
help
|
||
|
|
This option provides support for runtime services provided
|
||
|
|
by UEFI firmware (such as non-volatile variables, realtime
|
||
|
|
clock, and platform reset). A UEFI stub is also provided to
|
||
|
|
allow the kernel to be booted as an EFI application. This
|
||
|
|
is only useful on systems that have UEFI firmware.
|
||
|
|
|
||
|
|
config CC_HAVE_STACKPROTECTOR_TLS
|
||
|
|
def_bool $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=tp -mstack-protector-guard-offset=0)
|
||
|
|
|
||
|
|
config STACKPROTECTOR_PER_TASK
|
||
|
|
def_bool y
|
||
|
|
depends on !RANDSTRUCT
|
||
|
|
depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
|
||
|
|
|
||
|
|
config PHYS_RAM_BASE_FIXED
|
||
|
|
bool "Explicitly specified physical RAM address"
|
||
|
|
depends on NONPORTABLE
|
||
|
|
default n
|
||
|
|
|
||
|
|
config PHYS_RAM_BASE
|
||
|
|
hex "Platform Physical RAM address"
|
||
|
|
depends on PHYS_RAM_BASE_FIXED
|
||
|
|
default "0x80000000"
|
||
|
|
help
|
||
|
|
This is the physical address of RAM in the system. It has to be
|
||
|
|
explicitly specified to run early relocations of read-write data
|
||
|
|
from flash to RAM.
|
||
|
|
|
||
|
|
config XIP_KERNEL
|
||
|
|
bool "Kernel Execute-In-Place from ROM"
|
||
|
|
depends on MMU && SPARSEMEM && NONPORTABLE
|
||
|
|
# This prevents XIP from being enabled by all{yes,mod}config, which
|
||
|
|
# fail to build since XIP doesn't support large kernels.
|
||
|
|
depends on !COMPILE_TEST
|
||
|
|
select PHYS_RAM_BASE_FIXED
|
||
|
|
help
|
||
|
|
Execute-In-Place allows the kernel to run from non-volatile storage
|
||
|
|
directly addressable by the CPU, such as NOR flash. This saves RAM
|
||
|
|
space since the text section of the kernel is not loaded from flash
|
||
|
|
to RAM. Read-write sections, such as the data section and stack,
|
||
|
|
are still copied to RAM. The XIP kernel is not compressed since
|
||
|
|
it has to run directly from flash, so it will take more space to
|
||
|
|
store it. The flash address used to link the kernel object files,
|
||
|
|
and for storing it, is configuration dependent. Therefore, if you
|
||
|
|
say Y here, you must know the proper physical address where to
|
||
|
|
store the kernel image depending on your own flash memory usage.
|
||
|
|
|
||
|
|
Also note that the make target becomes "make xipImage" rather than
|
||
|
|
"make zImage" or "make Image". The final kernel binary to put in
|
||
|
|
ROM memory will be arch/riscv/boot/xipImage.
|
||
|
|
|
||
|
|
SPARSEMEM is required because the kernel text and rodata that are
|
||
|
|
flash resident are not backed by memmap, then any attempt to get
|
||
|
|
a struct page on those regions will trigger a fault.
|
||
|
|
|
||
|
|
If unsure, say N.
|
||
|
|
|
||
|
|
config XIP_PHYS_ADDR
|
||
|
|
hex "XIP Kernel Physical Location"
|
||
|
|
depends on XIP_KERNEL
|
||
|
|
default "0x21000000"
|
||
|
|
help
|
||
|
|
This is the physical address in your flash memory the kernel will
|
||
|
|
be linked for and stored to. This address is dependent on your
|
||
|
|
own flash usage.
|
||
|
|
|
||
|
|
endmenu # "Boot options"
|
||
|
|
|
||
|
|
config BUILTIN_DTB
|
||
|
|
bool
|
||
|
|
depends on OF && NONPORTABLE
|
||
|
|
default y if XIP_KERNEL
|
||
|
|
|
||
|
|
config PORTABLE
|
||
|
|
bool
|
||
|
|
default !NONPORTABLE
|
||
|
|
select EFI
|
||
|
|
select MMU
|
||
|
|
select OF
|
||
|
|
|
||
|
|
menu "Power management options"
|
||
|
|
|
||
|
|
source "kernel/power/Kconfig"
|
||
|
|
|
||
|
|
endmenu # "Power management options"
|
||
|
|
|
||
|
|
menu "CPU Power Management"
|
||
|
|
|
||
|
|
source "drivers/cpuidle/Kconfig"
|
||
|
|
|
||
|
|
source "drivers/cpufreq/Kconfig"
|
||
|
|
|
||
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endmenu # "CPU Power Management"
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||
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||
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source "arch/riscv/kvm/Kconfig"
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