Re: [PATCH v3 2/3] target/riscv: add support for svinval extension

[Anup Patel]

On Fri, Jan 14, 2022 at 7:11 AM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>
> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
> ---
>  target/riscv/cpu.c                          |  1 +
>  target/riscv/cpu.h                          |  1 +
>  target/riscv/insn32.decode                  |  7 ++
>  target/riscv/insn_trans/trans_svinval.c.inc | 75 +++++++++++++++++++++
>  target/riscv/translate.c                    |  1 +
>  5 files changed, 85 insertions(+)
>  create mode 100644 target/riscv/insn_trans/trans_svinval.c.inc
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index ff6c86c85b..45ac98e06b 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -668,6 +668,7 @@ static Property riscv_cpu_properties[] = {
>      DEFINE_PROP_UINT16("vlen", RISCVCPU, cfg.vlen, 128),
>      DEFINE_PROP_UINT16("elen", RISCVCPU, cfg.elen, 64),
>
> +    DEFINE_PROP_BOOL("svinval", RISCVCPU, cfg.ext_svinval, false),
>      DEFINE_PROP_BOOL("svnapot", RISCVCPU, cfg.ext_svnapot, false),
>
>      DEFINE_PROP_BOOL("zba", RISCVCPU, cfg.ext_zba, true),
> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> index d3d17cde82..c3d1845ca1 100644
> --- a/target/riscv/cpu.h
> +++ b/target/riscv/cpu.h
> @@ -327,6 +327,7 @@ struct RISCVCPU {
>          bool ext_counters;
>          bool ext_ifencei;
>          bool ext_icsr;
> +        bool ext_svinval;
>          bool ext_svnapot;
>          bool ext_zfh;
>          bool ext_zfhmin;
> diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
> index 5bbedc254c..7a0351fde2 100644
> --- a/target/riscv/insn32.decode
> +++ b/target/riscv/insn32.decode
> @@ -809,3 +809,10 @@ fcvt_l_h   1100010  00010 ..... ... ..... 1010011 @r2_rm
>  fcvt_lu_h  1100010  00011 ..... ... ..... 1010011 @r2_rm
>  fcvt_h_l   1101010  00010 ..... ... ..... 1010011 @r2_rm
>  fcvt_h_lu  1101010  00011 ..... ... ..... 1010011 @r2_rm
> +
> +# *** Svinval Standard Extension ***
> +sinval_vma        0001011 ..... ..... 000 00000 1110011 @sfence_vma
> +sfence_w_inval    0001100 00000 00000 000 00000 1110011
> +sfence_inval_ir   0001100 00001 00000 000 00000 1110011
> +hinval_vvma       0011011 ..... ..... 000 00000 1110011 @hfence_vvma

s/0011011/0010011/

> +hinval_gvma       0111011 ..... ..... 000 00000 1110011 @hfence_gvma

s/0111011/0110011/

> diff --git a/target/riscv/insn_trans/trans_svinval.c.inc 
> b/target/riscv/insn_trans/trans_svinval.c.inc
> new file mode 100644
> index 0000000000..1dde665661
> --- /dev/null
> +++ b/target/riscv/insn_trans/trans_svinval.c.inc
> @@ -0,0 +1,75 @@
> +/*
> + * RISC-V translation routines for the Svinval Standard Instruction Set.
> + *
> + * Copyright (c) 2020-2021 PLCT lab
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2 or later, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along 
> with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#define REQUIRE_SVINVAL(ctx) do {                    \
> +    if (!RISCV_CPU(ctx->cs)->cfg.ext_svinval) {      \
> +        return false;                                \
> +    }                                                \
> +} while (0)
> +
> +static bool trans_sinval_vma(DisasContext *ctx, arg_sinval_vma *a)
> +{
> +    REQUIRE_SVINVAL(ctx);
> +    /* Do the same as sfence.vma currently */
> +    REQUIRE_EXT(ctx, RVS);
> +#ifndef CONFIG_USER_ONLY
> +    gen_helper_tlb_flush(cpu_env);
> +    return true;
> +#endif
> +    return false;
> +}
> +
> +static bool trans_sfence_w_inval(DisasContext *ctx, arg_sfence_w_inval *a)
> +{
> +    REQUIRE_SVINVAL(ctx);
> +    REQUIRE_EXT(ctx, RVS);
> +    /* Do nothing currently */
> +    return true;
> +}
> +
> +static bool trans_sfence_inval_ir(DisasContext *ctx, arg_sfence_inval_ir *a)
> +{
> +    REQUIRE_SVINVAL(ctx);
> +    REQUIRE_EXT(ctx, RVS);
> +    /* Do nothing currently */
> +    return true;
> +}
> +
> +static bool trans_hinval_vvma(DisasContext *ctx, arg_hinval_vvma *a)
> +{
> +    REQUIRE_SVINVAL(ctx);
> +    /* Do the same as hfence.vvma currently */
> +    REQUIRE_EXT(ctx, RVH);
> +#ifndef CONFIG_USER_ONLY
> +    gen_helper_hyp_tlb_flush(cpu_env);
> +    return true;
> +#endif
> +    return false;
> +}
> +
> +static bool trans_hinval_gvma(DisasContext *ctx, arg_hinval_gvma *a)
> +{
> +    REQUIRE_SVINVAL(ctx);
> +    /* Do the same as hfence.gvma currently */
> +    REQUIRE_EXT(ctx, RVH);
> +#ifndef CONFIG_USER_ONLY
> +    gen_helper_hyp_gvma_tlb_flush(cpu_env);
> +    return true;
> +#endif
> +    return false;
> +}
> diff --git a/target/riscv/translate.c b/target/riscv/translate.c
> index 615048ec87..4e5a9660a4 100644
> --- a/target/riscv/translate.c
> +++ b/target/riscv/translate.c
> @@ -838,6 +838,7 @@ static uint32_t opcode_at(DisasContextBase *dcbase, 
> target_ulong pc)
>  #include "insn_trans/trans_rvb.c.inc"
>  #include "insn_trans/trans_rvzfh.c.inc"
>  #include "insn_trans/trans_privileged.c.inc"
> +#include "insn_trans/trans_svinval.c.inc"
>
>  /* Include the auto-generated decoder for 16 bit insn */
>  #include "decode-insn16.c.inc"
> --
> 2.17.1
>
>

Apart from the minor mistake above, it looks good to me.

Reviewed-by: Anup Patel <anup@brainfault.org>

Regards,
Anup