riscv: Add ISA extension parsing for Ziccrse

Add support to parse the Ziccrse string in the riscv,isa string.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Andrea Parri <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20241103145153.105097-12-alexghiti@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 74bcb0e..0aa3c3f 100644 (file)
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -94,6 +94,7 @@
 #define RISCV_ISA_EXT_ZAWRS            85
 #define RISCV_ISA_EXT_SVVPTC           86
 #define RISCV_ISA_EXT_ZABHA            87
+#define RISCV_ISA_EXT_ZICCRSE          88
 
 #define RISCV_ISA_EXT_XLINUXENVCFG     127
 

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 5e743d8..5f453a0 100644 (file)
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -314,6 +314,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
                                          riscv_ext_zicbom_validate),
        __RISCV_ISA_EXT_SUPERSET_VALIDATE(zicboz, RISCV_ISA_EXT_ZICBOZ, riscv_xlinuxenvcfg_exts,
                                          riscv_ext_zicboz_validate),
+       __RISCV_ISA_EXT_DATA(ziccrse, RISCV_ISA_EXT_ZICCRSE),
        __RISCV_ISA_EXT_DATA(zicntr, RISCV_ISA_EXT_ZICNTR),
        __RISCV_ISA_EXT_DATA(zicond, RISCV_ISA_EXT_ZICOND),
        __RISCV_ISA_EXT_DATA(zicsr, RISCV_ISA_EXT_ZICSR),