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Re: [PATCH 1/2] target/riscv: Add set_implicit_extensions_from_ext() fun
From: |
Alistair Francis |
Subject: |
Re: [PATCH 1/2] target/riscv: Add set_implicit_extensions_from_ext() function |
Date: |
Wed, 12 Apr 2023 12:51:46 +1000 |
On Mon, Apr 10, 2023 at 1:36 PM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>
> Move multi-letter extensions that may implicitly enabled from misa.EXT
> alone to prepare for following separation of implicitly enabled and
> explicitly enabled extensions.
>
> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> ---
> target/riscv/cpu.c | 56 +++++++++++++++++++++++++---------------------
> 1 file changed, 31 insertions(+), 25 deletions(-)
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index cb68916fce..abb65d41b1 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -809,6 +809,35 @@ static void riscv_cpu_disas_set_info(CPUState *s,
> disassemble_info *info)
> }
> }
>
> +static void set_implicit_extensions_from_ext(RISCVCPU *cpu)
> +{
> +
> + /* The V vector extension depends on the Zve64d extension */
> + if (cpu->cfg.ext_v) {
> + cpu->cfg.ext_zve64d = true;
> + }
> +
> + /* The Zve64d extension depends on the Zve64f extension */
> + if (cpu->cfg.ext_zve64d) {
> + cpu->cfg.ext_zve64f = true;
> + }
> +
> + /* The Zve64f extension depends on the Zve32f extension */
> + if (cpu->cfg.ext_zve64f) {
> + cpu->cfg.ext_zve32f = true;
> + }
> +
> + if (cpu->cfg.ext_c) {
> + cpu->cfg.ext_zca = true;
> + if (cpu->cfg.ext_f && cpu->env.misa_mxl_max == MXL_RV32) {
> + cpu->cfg.ext_zcf = true;
> + }
> + if (cpu->cfg.ext_d) {
> + cpu->cfg.ext_zcd = true;
> + }
> + }
> +}
> +
> /*
> * Check consistency between chosen extensions while setting
> * cpu->cfg accordingly, doing a set_misa() in the end.
> @@ -833,6 +862,8 @@ static void riscv_cpu_validate_set_extensions(RISCVCPU
> *cpu, Error **errp)
> cpu->cfg.ext_ifencei = true;
> }
>
> + set_implicit_extensions_from_ext(cpu);
> +
> if (cpu->cfg.ext_i && cpu->cfg.ext_e) {
> error_setg(errp,
> "I and E extensions are incompatible");
> @@ -886,21 +917,6 @@ static void riscv_cpu_validate_set_extensions(RISCVCPU
> *cpu, Error **errp)
> return;
> }
>
> - /* The V vector extension depends on the Zve64d extension */
> - if (cpu->cfg.ext_v) {
> - cpu->cfg.ext_zve64d = true;
> - }
> -
> - /* The Zve64d extension depends on the Zve64f extension */
> - if (cpu->cfg.ext_zve64d) {
> - cpu->cfg.ext_zve64f = true;
> - }
> -
> - /* The Zve64f extension depends on the Zve32f extension */
> - if (cpu->cfg.ext_zve64f) {
> - cpu->cfg.ext_zve32f = true;
> - }
> -
> if (cpu->cfg.ext_zve64d && !cpu->cfg.ext_d) {
> error_setg(errp, "Zve64d/V extensions require D extension");
> return;
> @@ -956,16 +972,6 @@ static void riscv_cpu_validate_set_extensions(RISCVCPU
> *cpu, Error **errp)
> }
> }
>
> - if (cpu->cfg.ext_c) {
> - cpu->cfg.ext_zca = true;
> - if (cpu->cfg.ext_f && env->misa_mxl_max == MXL_RV32) {
> - cpu->cfg.ext_zcf = true;
> - }
> - if (cpu->cfg.ext_d) {
> - cpu->cfg.ext_zcd = true;
> - }
> - }
> -
> if (env->misa_mxl_max != MXL_RV32 && cpu->cfg.ext_zcf) {
> error_setg(errp, "Zcf extension is only relevant to RV32");
> return;
> --
> 2.25.1
>
>