diff options
| author | Palmer Dabbelt <palmer@sifive.com> | 2018-10-22 17:38:26 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2018-10-22 17:38:26 -0700 |
| commit | 4e4101cfefd382176b05356c5ef112561ae10384 (patch) | |
| tree | b60173dc3824f7da801b33d5d1d172c4a6f9e41f /arch/riscv/Makefile | |
| parent | aef53f97b505ff94190ce3a06dcd0ded6cf5c0ca (diff) | |
| parent | 9411ec60c23d868124d9c1b1d491937aebe07afa (diff) | |
riscv: Add support to no-FPU systems
This patchset adds an option, CONFIG_FPU, to enable/disable floating-
point support within the kernel. The kernel's new behavior will be as
follows:
* with CONFIG_FPU=y
All FPU codes are reserved. If no FPU is found during booting, a
global flag will be set, and those functions will be bypassed with
condition check to that flag.
* with CONFIG_FPU=n
No floating-point instructions in kernel and all related settings
are excluded.
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Diffstat (limited to 'arch/riscv/Makefile')
| -rw-r--r-- | arch/riscv/Makefile | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 33700e4bfc3b..d10146197533 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -26,7 +26,6 @@ ifeq ($(CONFIG_ARCH_RV64I),y) KBUILD_CFLAGS += -mabi=lp64 KBUILD_AFLAGS += -mabi=lp64 - KBUILD_MARCH = rv64im KBUILD_LDFLAGS += -melf64lriscv else BITS := 32 @@ -34,22 +33,20 @@ else KBUILD_CFLAGS += -mabi=ilp32 KBUILD_AFLAGS += -mabi=ilp32 - KBUILD_MARCH = rv32im KBUILD_LDFLAGS += -melf32lriscv endif KBUILD_CFLAGS += -Wall -ifeq ($(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) +# ISA string setting +riscv-march-$(CONFIG_ARCH_RV32I) := rv32im +riscv-march-$(CONFIG_ARCH_RV64I) := rv64im +riscv-march-$(CONFIG_RISCV_ISA_A) := $(riscv-march-y)a +riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd +riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c +KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) +KBUILD_AFLAGS += -march=$(riscv-march-y) -KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C) KBUILD_CFLAGS += -mno-save-restore KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET) |