target/riscv: remove cpu->cfg.ext_c

Create a new "c" RISCVCPUMisaExtConfig property that will update
env->misa_ext* with RVC. Instances of cpu->cfg.ext_c and similar are
replaced with riscv_has_ext(env, RVC).

Remove the old "c" property and 'ext_c' from RISCVCPUConfig.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230406180351.570807-7-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu.c

@@ -407,7 +407,6 @@ static void rv64_thead_c906_cpu_init(Object *obj)
     set_priv_version(env, PRIV_VERSION_1_11_0);
 
     cpu->cfg.ext_g = true;
-    cpu->cfg.ext_c = true;
     cpu->cfg.ext_u = true;
     cpu->cfg.ext_s = true;
     cpu->cfg.ext_icsr = true;
@@ -957,7 +956,7 @@ static void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, Error **errp)
         }
     }
 
-    if (cpu->cfg.ext_c) {
+    if (riscv_has_ext(env, RVC)) {
         cpu->cfg.ext_zca = true;
         if (cpu->cfg.ext_f && env->misa_mxl_max == MXL_RV32) {
             cpu->cfg.ext_zcf = true;
@@ -1168,7 +1167,7 @@ static void riscv_cpu_sync_misa_cfg(CPURISCVState *env)
     if (riscv_cpu_cfg(env)->ext_d) {
         ext |= RVD;
     }
-    if (riscv_cpu_cfg(env)->ext_c) {
+    if (riscv_has_ext(env, RVC)) {
         ext |= RVC;
     }
     if (riscv_cpu_cfg(env)->ext_s) {
@@ -1498,6 +1497,8 @@ static void cpu_get_misa_ext_cfg(Object *obj, Visitor *v, const char *name,
 static const RISCVCPUMisaExtConfig misa_ext_cfgs[] = {
     {.name = "a", .description = "Atomic instructions",
      .misa_bit = RVA, .enabled = true},
+    {.name = "c", .description = "Compressed instructions",
+     .misa_bit = RVC, .enabled = true},
 };
 
 static void riscv_cpu_add_misa_properties(Object *cpu_obj)
@@ -1526,7 +1527,6 @@ static Property riscv_cpu_extensions[] = {
     DEFINE_PROP_BOOL("m", RISCVCPU, cfg.ext_m, true),
     DEFINE_PROP_BOOL("f", RISCVCPU, cfg.ext_f, true),
     DEFINE_PROP_BOOL("d", RISCVCPU, cfg.ext_d, true),
-    DEFINE_PROP_BOOL("c", RISCVCPU, cfg.ext_c, true),
     DEFINE_PROP_BOOL("s", RISCVCPU, cfg.ext_s, true),
     DEFINE_PROP_BOOL("u", RISCVCPU, cfg.ext_u, true),
     DEFINE_PROP_BOOL("v", RISCVCPU, cfg.ext_v, false),
@@ -1649,7 +1649,6 @@ static void register_cpu_props(Object *obj)
         cpu->cfg.ext_f = misa_ext & RVF;
         cpu->cfg.ext_d = misa_ext & RVD;
         cpu->cfg.ext_v = misa_ext & RVV;
-        cpu->cfg.ext_c = misa_ext & RVC;
         cpu->cfg.ext_s = misa_ext & RVS;
         cpu->cfg.ext_u = misa_ext & RVU;
         cpu->cfg.ext_h = misa_ext & RVH;

target/riscv/cpu.h

@@ -428,7 +428,6 @@ struct RISCVCPUConfig {
     bool ext_m;
     bool ext_f;
     bool ext_d;
-    bool ext_c;
     bool ext_s;
     bool ext_u;
     bool ext_h;