riscv: add ISA extension parsing for Zbc

Zbc was documented in the dt-bindings but actually not supported in ISA
string parsing. Add it.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Link: https://lore.kernel.org/r/20231114141256.126749-2-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 06d30526ef3b837d4e6c7fe8d14cb39f11e676f1..afa9abc1a0b0fcc18ce2108e04411d5145849e44 100644 (file)
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -57,6 +57,7 @@
 #define RISCV_ISA_EXT_ZIHPM            42
 #define RISCV_ISA_EXT_SMSTATEEN                43
 #define RISCV_ISA_EXT_ZICOND           44
+#define RISCV_ISA_EXT_ZBC              45
 
 #define RISCV_ISA_EXT_MAX              64
 

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index b3785ffc15703cdf55efc2c523179dd2b64695c1..eae14daa5a75b7ae321d05100053f9d214457cb4 100644 (file)
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -176,6 +176,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
        __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
        __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),
        __RISCV_ISA_EXT_DATA(zbs, RISCV_ISA_EXT_ZBS),
        __RISCV_ISA_EXT_DATA(smaia, RISCV_ISA_EXT_SMAIA),
        __RISCV_ISA_EXT_DATA(smstateen, RISCV_ISA_EXT_SMSTATEEN),