[PATCH 1/3] RISC-V: Add Zba extension probing

[Palmer Dabbelt]

On Fri, 28 Apr 2023 12:06:06 PDT (-0700), Evan Green wrote:
> Add the Zba address bit manipulation extension into those the kernel is
> aware of and maintains in its riscv_isa bitmap.
>
> Signed-off-by: Evan Green <evan at rivosinc.com>
> ---
>
>  arch/riscv/include/asm/hwcap.h | 1 +
>  arch/riscv/kernel/cpu.c        | 1 +
>  arch/riscv/kernel/cpufeature.c | 1 +
>  3 files changed, 3 insertions(+)
>
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index 9af793970855..fa36db9281ab 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -44,6 +44,7 @@
>  #define RISCV_ISA_EXT_ZIHINTPAUSE	32
>  #define RISCV_ISA_EXT_SVNAPOT		33
>  #define RISCV_ISA_EXT_ZICBOZ		34
> +#define RISCV_ISA_EXT_ZBA		35
>
>  #define RISCV_ISA_EXT_MAX		64
>  #define RISCV_ISA_EXT_NAME_LEN_MAX	32
> diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> index 3df38052dcbd..2f85b1656557 100644
> --- a/arch/riscv/kernel/cpu.c
> +++ b/arch/riscv/kernel/cpu.c
> @@ -184,6 +184,7 @@ static struct riscv_isa_ext_data isa_ext_arr[] = {
>  	__RISCV_ISA_EXT_DATA(zicbom, RISCV_ISA_EXT_ZICBOM),
>  	__RISCV_ISA_EXT_DATA(zicboz, RISCV_ISA_EXT_ZICBOZ),
>  	__RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
> +	__RISCV_ISA_EXT_DATA(zba, RISCV_ISA_EXT_ZBA),
>  	__RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
>  	__RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
>  	__RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 52585e088873..1a80474e308e 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -233,6 +233,7 @@ void __init riscv_fill_hwcap(void)
>  				SET_ISA_EXT_MAP("svinval", RISCV_ISA_EXT_SVINVAL);
>  				SET_ISA_EXT_MAP("svnapot", RISCV_ISA_EXT_SVNAPOT);
>  				SET_ISA_EXT_MAP("svpbmt", RISCV_ISA_EXT_SVPBMT);
> +				SET_ISA_EXT_MAP("zba", RISCV_ISA_EXT_ZBA);
>  				SET_ISA_EXT_MAP("zbb", RISCV_ISA_EXT_ZBB);
>  				SET_ISA_EXT_MAP("zicbom", RISCV_ISA_EXT_ZICBOM);
>  				SET_ISA_EXT_MAP("zicboz", RISCV_ISA_EXT_ZICBOZ);

Reviewed-by: Palmer Dabbelt <palmer at rivosinc.com>