3b306f6f3a
I'm removing the generic 64-bit divide support, which means this will no
longer work.
This reverts commit 757331db92.
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
295 lines
6.5 KiB
Plaintext
295 lines
6.5 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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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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# even on 32-bit, physical (and DMA) addresses are > 32-bits
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select PHYS_ADDR_T_64BIT
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select OF
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select OF_EARLY_FLATTREE
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select OF_IRQ
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select ARCH_WANT_FRAME_POINTERS
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select CLONE_BACKWARDS
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select COMMON_CLK
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select DMA_DIRECT_OPS
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select GENERIC_CLOCKEVENTS
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select GENERIC_CPU_DEVICES
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select GENERIC_IRQ_SHOW
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select GENERIC_PCI_IOMAP
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select GENERIC_STRNCPY_FROM_USER
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select GENERIC_STRNLEN_USER
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_ATOMIC64 if !64BIT || !RISCV_ISA_A
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select HAVE_MEMBLOCK
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select HAVE_MEMBLOCK_NODE_MAP
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select HAVE_DMA_CONTIGUOUS
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select HAVE_FUTEX_CMPXCHG if FUTEX
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select HAVE_GENERIC_DMA_COHERENT
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select HAVE_PERF_EVENTS
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select IRQ_DOMAIN
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select NO_BOOTMEM
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select RISCV_ISA_A if SMP
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select SPARSE_IRQ
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select SYSCTL_EXCEPTION_TRACE
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select HAVE_ARCH_TRACEHOOK
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select MODULES_USE_ELF_RELA if MODULES
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select THREAD_INFO_IN_TASK
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select RISCV_TIMER
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select GENERIC_IRQ_MULTI_HANDLER
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select ARCH_HAS_PTE_SPECIAL
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config MMU
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def_bool y
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config ZONE_DMA32
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bool
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default y if 64BIT
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config PAGE_OFFSET
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hex
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default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
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default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
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default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
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config STACKTRACE_SUPPORT
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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config RWSEM_GENERIC_SPINLOCK
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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 PGTABLE_LEVELS
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int
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default 3 if 64BIT
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default 2
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config HAVE_KPROBES
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def_bool n
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menu "Platform type"
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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 traget 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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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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config ARCH_RV64I
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bool "RV64I"
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select 64BIT
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select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000
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select HAVE_FUNCTION_TRACER
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_FTRACE_MCOUNT_RECORD
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select HAVE_DYNAMIC_FTRACE
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select HAVE_DYNAMIC_FTRACE_WITH_REGS
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select SWIOTLB
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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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choice
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prompt "Maximum Physical Memory"
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default MAXPHYSMEM_2GB if 32BIT
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default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
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default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
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config MAXPHYSMEM_2GB
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bool "2GiB"
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config MAXPHYSMEM_128GB
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depends on 64BIT && CMODEL_MEDANY
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select MODULE_SECTIONS if MODULES
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bool "128GiB"
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endchoice
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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 (2-32)"
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range 2 32
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depends on SMP
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default "8"
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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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config RISCV_ISA_C
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bool "Emit compressed instructions when building Linux"
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default y
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help
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Adds "C" to the ISA subsets that the toolchain is allowed to emit
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when building Linux, which results in compressed instructions in the
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Linux binary.
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If you don't know what to do here, say Y.
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config RISCV_ISA_A
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def_bool y
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menu "supported PMU type"
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depends on PERF_EVENTS
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config RISCV_BASE_PMU
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bool "Base Performance Monitoring Unit"
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def_bool y
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help
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A base PMU that serves as a reference implementation and has limited
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feature of perf. It can run on any RISC-V machines so serves as the
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fallback, but this option can also be disable to reduce kernel size.
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endmenu
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config FPU
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bool "FPU support"
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default y
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help
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Say N here if you want to disable all floating-point related procedure
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in the kernel.
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If you don't know what to do here, say Y.
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endmenu
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menu "Kernel features"
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source "kernel/Kconfig.hz"
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endmenu
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menu "Boot options"
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config CMDLINE_BOOL
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bool "Built-in kernel command line"
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help
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For most platforms, it is firmware or second stage bootloader
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that by default specifies the kernel command line options.
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However, it might be necessary or advantageous to either override
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the default kernel command line or add a few extra options to it.
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For such cases, this option allows hardcoding command line options
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directly into the kernel.
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For that, choose 'Y' here and fill in the extra boot parameters
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in CONFIG_CMDLINE.
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The built-in options will be concatenated to the default command
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line if CMDLINE_FORCE is set to 'N'. Otherwise, the default
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command line will be ignored and replaced by the built-in string.
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config CMDLINE
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string "Built-in kernel command string"
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depends on CMDLINE_BOOL
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default ""
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help
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Supply command-line options at build time by entering them here.
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config CMDLINE_FORCE
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bool "Built-in command line overrides bootloader arguments"
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depends on CMDLINE_BOOL
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help
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Set this option to 'Y' to have the kernel ignore the bootloader
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or firmware command line. Instead, the built-in command line
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will be used exclusively.
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If you don't know what to do here, say N.
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endmenu
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menu "Bus support"
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config PCI
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bool "PCI support"
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select PCI_MSI
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help
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This feature enables support for PCI bus system. If you say Y
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here, the kernel will include drivers and infrastructure code
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to support PCI bus devices.
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If you don't know what to do here, say Y.
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config PCI_DOMAINS
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def_bool PCI
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config PCI_DOMAINS_GENERIC
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def_bool PCI
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source "drivers/pci/Kconfig"
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endmenu
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menu "Power management options"
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source kernel/power/Kconfig
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endmenu
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