riscv: add ISA extension parsing for Zfh/Zfh[min]

Add parsing for Zfh[min] ISA extensions[1].

Link: https://drive.google.com/file/d/1z3tQQLm5ALsAD77PM0l0CHnapxWCeVzP/view
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Link: https://lore.kernel.org/r/20231114141256.126749-10-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index 4772546..6a6ee93 100644 (file)
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -78,6 +78,8 @@
 #define RISCV_ISA_EXT_ZVKSED           63
 #define RISCV_ISA_EXT_ZVKSH            64
 #define RISCV_ISA_EXT_ZVKT             65
+#define RISCV_ISA_EXT_ZFH              66
+#define RISCV_ISA_EXT_ZFHMIN           67
 
 #define RISCV_ISA_EXT_MAX              128
 #define RISCV_ISA_EXT_INVALID          U32_MAX

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index c4d0f16..7182cf2 100644 (file)
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -258,6 +258,8 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
        __RISCV_ISA_EXT_DATA(zifencei, RISCV_ISA_EXT_ZIFENCEI),
        __RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
        __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
+       __RISCV_ISA_EXT_DATA(zfh, RISCV_ISA_EXT_ZFH),
+       __RISCV_ISA_EXT_DATA(zfhmin, RISCV_ISA_EXT_ZFHMIN),
        __RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
        __RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
        __RISCV_ISA_EXT_DATA(zbc, RISCV_ISA_EXT_ZBC),