target/riscv: Add implied rule for counter delegation extensions

The counter delegation/configuration extensions depend on the following
extensions.

1. Smcdeleg - To enable counter delegation from M to S
2. S[m|s]csrind - To enable indirect access CSRs

Add an implied rule so that these extensions are enabled by default
if the sscfg extension is enabled.

Reviewed-by: Daniel Henrique Barboza <[email protected]>
Acked-by: Alistair Francis <[email protected]>
Signed-off-by: Atish Patra <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Alistair Francis <[email protected]>

Author: atishp04

target/riscv/cpu.c

@@ -2760,6 +2760,16 @@ static RISCVCPUImpliedExtsRule ZVKSG_IMPLIED = {
     },
 };
 
+static RISCVCPUImpliedExtsRule SSCFG_IMPLIED = {
+    .ext = CPU_CFG_OFFSET(ext_ssccfg),
+    .implied_multi_exts = {
+        CPU_CFG_OFFSET(ext_smcsrind), CPU_CFG_OFFSET(ext_sscsrind),
+        CPU_CFG_OFFSET(ext_smcdeleg),
+
+        RISCV_IMPLIED_EXTS_RULE_END
+    },
+};
+
 RISCVCPUImpliedExtsRule *riscv_misa_ext_implied_rules[] = {
     &RVA_IMPLIED, &RVD_IMPLIED, &RVF_IMPLIED,
     &RVM_IMPLIED, &RVV_IMPLIED, NULL
@@ -2777,7 +2787,7 @@ RISCVCPUImpliedExtsRule *riscv_multi_ext_implied_rules[] = {
     &ZVE64X_IMPLIED, &ZVFBFMIN_IMPLIED, &ZVFBFWMA_IMPLIED,
     &ZVFH_IMPLIED, &ZVFHMIN_IMPLIED, &ZVKN_IMPLIED,
     &ZVKNC_IMPLIED, &ZVKNG_IMPLIED, &ZVKNHB_IMPLIED,
-    &ZVKS_IMPLIED,  &ZVKSC_IMPLIED, &ZVKSG_IMPLIED,
+    &ZVKS_IMPLIED,  &ZVKSC_IMPLIED, &ZVKSG_IMPLIED, &SSCFG_IMPLIED,
     NULL
 };