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| author | Palmer Dabbelt | 2017-07-11 03:08:08 +0200 |
|---|---|---|
| committer | Palmer Dabbelt | 2017-09-27 00:26:49 +0200 |
| commit | fbe934d69eb7ed22b59514e9c1fe8871b8b198ec (patch) | |
| tree | b239456f878fa37605efc79216b870cba55f977b /arch/riscv/Makefile | |
| parent | RISC-V: User-facing API (diff) | |
| download | kernel-qcow2-linux-fbe934d69eb7ed22b59514e9c1fe8871b8b198ec.tar.gz kernel-qcow2-linux-fbe934d69eb7ed22b59514e9c1fe8871b8b198ec.tar.xz kernel-qcow2-linux-fbe934d69eb7ed22b59514e9c1fe8871b8b198ec.zip | |
RISC-V: Build Infrastructure
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>
Diffstat (limited to 'arch/riscv/Makefile')
| -rw-r--r-- | arch/riscv/Makefile | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile new file mode 100644 index 000000000000..6719dd30ec5b --- /dev/null +++ b/arch/riscv/Makefile @@ -0,0 +1,72 @@ +# This file is included by the global makefile so that you can add your own +# architecture-specific flags and dependencies. Remember to do have actions +# for "archclean" and "archdep" for cleaning up and making dependencies for +# this architecture +# +# This file is subject to the terms and conditions of the GNU General Public +# License. See the file "COPYING" in the main directory of this archive +# for more details. +# + +LDFLAGS := +OBJCOPYFLAGS := -O binary +LDFLAGS_vmlinux := +KBUILD_AFLAGS_MODULE += -fPIC +KBUILD_CFLAGS_MODULE += -fPIC + +KBUILD_DEFCONFIG = defconfig + +export BITS +ifeq ($(CONFIG_ARCH_RV64I),y) + BITS := 64 + UTS_MACHINE := riscv64 + + KBUILD_CFLAGS += -mabi=lp64 + KBUILD_AFLAGS += -mabi=lp64 + KBUILD_MARCH = rv64im + LDFLAGS += -melf64lriscv +else + BITS := 32 + UTS_MACHINE := riscv32 + + KBUILD_CFLAGS += -mabi=ilp32 + KBUILD_AFLAGS += -mabi=ilp32 + KBUILD_MARCH = rv32im + LDFLAGS += -melf32lriscv +endif + +KBUILD_CFLAGS += -Wall + +ifeq ($(CONFIG_RISCV_ISA_A),y) + KBUILD_ARCH_A = a +endif +ifeq ($(CONFIG_RISCV_ISA_C),y) + KBUILD_ARCH_C = c +endif + +KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C) + +KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C) +KBUILD_CFLAGS += -mno-save-restore +KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) + +ifeq ($(CONFIG_CMODEL_MEDLOW),y) + KBUILD_CFLAGS += -mcmodel=medlow +endif +ifeq ($(CONFIG_CMODEL_MEDANY),y) + KBUILD_CFLAGS += -mcmodel=medany +endif + +# GCC versions that support the "-mstrict-align" option default to allowing +# unaligned accesses. While unaligned accesses are explicitly allowed in the +# RISC-V ISA, they're emulated by machine mode traps on all extant +# architectures. It's faster to have GCC emit only aligned accesses. +KBUILD_CFLAGS += $(call cc-option,-mstrict-align) + +head-y := arch/riscv/kernel/head.o + +core-y += arch/riscv/kernel/ arch/riscv/mm/ + +libs-y += arch/riscv/lib/ + +all: vmlinux |