fbe934d69e
This patch contains all the build infrastructure that actually enables the RISC-V port. This includes Makefiles, linker scripts, and Kconfig files. It also contains the only top-level change, which adds RISC-V to the list of architectures that need a sed run to produce the ARCH variable when building locally. Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
73 lines
1.9 KiB
Makefile
73 lines
1.9 KiB
Makefile
# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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LDFLAGS :=
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OBJCOPYFLAGS := -O binary
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LDFLAGS_vmlinux :=
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KBUILD_AFLAGS_MODULE += -fPIC
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KBUILD_CFLAGS_MODULE += -fPIC
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KBUILD_DEFCONFIG = defconfig
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export BITS
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ifeq ($(CONFIG_ARCH_RV64I),y)
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BITS := 64
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UTS_MACHINE := riscv64
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KBUILD_CFLAGS += -mabi=lp64
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KBUILD_AFLAGS += -mabi=lp64
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KBUILD_MARCH = rv64im
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LDFLAGS += -melf64lriscv
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else
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BITS := 32
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UTS_MACHINE := riscv32
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KBUILD_CFLAGS += -mabi=ilp32
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KBUILD_AFLAGS += -mabi=ilp32
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KBUILD_MARCH = rv32im
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LDFLAGS += -melf32lriscv
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endif
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KBUILD_CFLAGS += -Wall
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ifeq ($(CONFIG_RISCV_ISA_A),y)
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KBUILD_ARCH_A = a
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endif
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ifeq ($(CONFIG_RISCV_ISA_C),y)
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KBUILD_ARCH_C = c
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endif
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KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C)
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KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C)
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KBUILD_CFLAGS += -mno-save-restore
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KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
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ifeq ($(CONFIG_CMODEL_MEDLOW),y)
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KBUILD_CFLAGS += -mcmodel=medlow
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endif
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ifeq ($(CONFIG_CMODEL_MEDANY),y)
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KBUILD_CFLAGS += -mcmodel=medany
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endif
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# GCC versions that support the "-mstrict-align" option default to allowing
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# unaligned accesses. While unaligned accesses are explicitly allowed in the
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# RISC-V ISA, they're emulated by machine mode traps on all extant
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# architectures. It's faster to have GCC emit only aligned accesses.
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KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
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head-y := arch/riscv/kernel/head.o
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core-y += arch/riscv/kernel/ arch/riscv/mm/
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libs-y += arch/riscv/lib/
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all: vmlinux
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