riscv: add ISA extension parsing for Zacas

Add parsing for Zacas ISA extension which was ratified recently in the
riscv-zacas manual.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Link: https://lore.kernel.org/r/20231220155723.684081-5-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 3b31efe2f716d883beaa8ed686ebebc558e8e054..34f86424d743941cf35d025daa0399f9f85af41b 100644 (file)
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -85,6 +85,7 @@
 #define RISCV_ISA_EXT_ZVFHMIN          70
 #define RISCV_ISA_EXT_ZFA              71
 #define RISCV_ISA_EXT_ZTSO             72
+#define RISCV_ISA_EXT_ZACAS            73
 
 #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 3eb48a0eecb3e8a721f81e54cb8ae05825e0459e..9a9d915b5bb2e95ed14dc40c0465fc35b7c7a354 100644 (file)
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -259,6 +259,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
        __RISCV_ISA_EXT_DATA(zihintntl, RISCV_ISA_EXT_ZIHINTNTL),
        __RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
        __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
+       __RISCV_ISA_EXT_DATA(zacas, RISCV_ISA_EXT_ZACAS),
        __RISCV_ISA_EXT_DATA(zfa, RISCV_ISA_EXT_ZFA),
        __RISCV_ISA_EXT_DATA(zfh, RISCV_ISA_EXT_ZFH),
        __RISCV_ISA_EXT_DATA(zfhmin, RISCV_ISA_EXT_ZFHMIN),