On Wed, Jun 19, 2024 at 01:35:18PM +0200, Clément Léger wrote:
> The Zc* standard extension for code reduction introduces new extensions.
> This patch adds support for Zca, Zcf, Zcd and Zcb. Zce, Zcmt and Zcmp
> are left out of this patch since they are targeting microcontrollers/
> embedded CPUs instead of application processors.
>
> Signed-off-by: Clément Léger <cleger@xxxxxxxxxxxx>
> Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> ---
> arch/riscv/include/asm/hwcap.h | 4 +++
> arch/riscv/kernel/cpufeature.c | 55 +++++++++++++++++++++++++++++++++-
> 2 files changed, 58 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index 18859277843a..b12ae3f2141c 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -87,6 +87,10 @@
> #define RISCV_ISA_EXT_ZVE64F 78
> #define RISCV_ISA_EXT_ZVE64D 79
> #define RISCV_ISA_EXT_ZIMOP 80
> +#define RISCV_ISA_EXT_ZCA 81
> +#define RISCV_ISA_EXT_ZCB 82
> +#define RISCV_ISA_EXT_ZCD 83
> +#define RISCV_ISA_EXT_ZCF 84
>
> #define RISCV_ISA_EXT_XLINUXENVCFG 127
>
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index a3af976f36c9..aa631fe49b7c 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -111,6 +111,9 @@ static int riscv_ext_zicboz_validate(const struct riscv_isa_ext_data *data,
>
> #define __RISCV_ISA_EXT_DATA(_name, _id) _RISCV_ISA_EXT_DATA(_name, _id, NULL, 0, NULL)
>
> +#define __RISCV_ISA_EXT_DATA_VALIDATE(_name, _id, _validate) \
> + _RISCV_ISA_EXT_DATA(_name, _id, NULL, 0, _validate)
> +
> /* Used to declare pure "lasso" extension (Zk for instance) */
> #define __RISCV_ISA_EXT_BUNDLE(_name, _bundled_exts) \
> _RISCV_ISA_EXT_DATA(_name, RISCV_ISA_EXT_INVALID, _bundled_exts, \
> @@ -122,6 +125,37 @@ static int riscv_ext_zicboz_validate(const struct riscv_isa_ext_data *data,
> #define __RISCV_ISA_EXT_SUPERSET_VALIDATE(_name, _id, _sub_exts, _validate) \
> _RISCV_ISA_EXT_DATA(_name, _id, _sub_exts, ARRAY_SIZE(_sub_exts), _validate)
>
> +static int riscv_ext_zca_depends(const struct riscv_isa_ext_data *data,
It's super minor, but my OCD doesn't like this being called "depends"
when the others are all called "validate".
> + const unsigned long *isa_bitmap)
> +{
> + if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA))
> + return 0;
> +
> + return -EPROBE_DEFER;
> +}
> +static int riscv_ext_zcd_validate(const struct riscv_isa_ext_data *data,
> + const unsigned long *isa_bitmap)
> +{
> + if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA) &&
> + __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_d))
> + return 0;
> +
> + return -EPROBE_DEFER;
> +}
> +
> +static int riscv_ext_zcf_validate(const struct riscv_isa_ext_data *data,
> + const unsigned long *isa_bitmap)
> +{
> + if (IS_ENABLED(CONFIG_64BIT))
> + return -EINVAL;
> +
> + if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZCA) &&
> + __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_f))
> + return 0;
> +
> + return -EPROBE_DEFER;
> +}
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