target/riscv: Create current pm fields in env

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220120122050.41546-12-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu.c

@@ -430,6 +430,7 @@ static void riscv_cpu_reset(DeviceState *dev)
     env->mmte |= (PM_EXT_INITIAL | MMTE_M_PM_CURRENT);
 #endif
     env->xl = riscv_cpu_mxl(env);
+    riscv_cpu_update_mask(env);
     cs->exception_index = RISCV_EXCP_NONE;
     env->load_res = -1;
     set_default_nan_mode(1, &env->fp_status);

target/riscv/cpu.h

@@ -266,6 +266,8 @@ struct CPURISCVState {
     target_ulong upmmask;
     target_ulong upmbase;
 #endif
+    target_ulong cur_pmmask;
+    target_ulong cur_pmbase;
 
     float_status fp_status;
 
@@ -515,6 +517,8 @@ static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype)
 void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
                           target_ulong *cs_base, uint32_t *pflags);
 
+void riscv_cpu_update_mask(CPURISCVState *env);
+
 RISCVException riscv_csrrw(CPURISCVState *env, int csrno,
                            target_ulong *ret_value,
                            target_ulong new_value, target_ulong write_mask);

target/riscv/cpu_helper.c

@@ -122,6 +122,48 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
     *pflags = flags;
 }
 
+void riscv_cpu_update_mask(CPURISCVState *env)
+{
+    target_ulong mask = -1, base = 0;
+    /*
+     * TODO: Current RVJ spec does not specify
+     * how the extension interacts with XLEN.
+     */
+#ifndef CONFIG_USER_ONLY
+    if (riscv_has_ext(env, RVJ)) {
+        switch (env->priv) {
+        case PRV_M:
+            if (env->mmte & M_PM_ENABLE) {
+                mask = env->mpmmask;
+                base = env->mpmbase;
+            }
+            break;
+        case PRV_S:
+            if (env->mmte & S_PM_ENABLE) {
+                mask = env->spmmask;
+                base = env->spmbase;
+            }
+            break;
+        case PRV_U:
+            if (env->mmte & U_PM_ENABLE) {
+                mask = env->upmmask;
+                base = env->upmbase;
+            }
+            break;
+        default:
+            g_assert_not_reached();
+        }
+    }
+#endif
+    if (env->xl == MXL_RV32) {
+        env->cur_pmmask = mask & UINT32_MAX;
+        env->cur_pmbase = base & UINT32_MAX;
+    } else {
+        env->cur_pmmask = mask;
+        env->cur_pmbase = base;
+    }
+}
+
 #ifndef CONFIG_USER_ONLY
 static int riscv_cpu_local_irq_pending(CPURISCVState *env)
 {
@@ -334,6 +376,7 @@ void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv)
     /* tlb_flush is unnecessary as mode is contained in mmu_idx */
     env->priv = newpriv;
     env->xl = cpu_recompute_xl(env);
+    riscv_cpu_update_mask(env);
 
     /*
      * Clear the load reservation - otherwise a reservation placed in one

target/riscv/csr.c

@@ -1607,6 +1607,7 @@ static RISCVException write_mmte(CPURISCVState *env, int csrno,
     /* hardwiring pm.instruction bit to 0, since it's not supported yet */
     wpri_val &= ~(MMTE_M_PM_INSN | MMTE_S_PM_INSN | MMTE_U_PM_INSN);
     env->mmte = wpri_val | PM_EXT_DIRTY;
+    riscv_cpu_update_mask(env);
 
     /* Set XS and SD bits, since PM CSRs are dirty */
     mstatus = env->mstatus | MSTATUS_XS;
@@ -1682,6 +1683,9 @@ static RISCVException write_mpmmask(CPURISCVState *env, int csrno,
     uint64_t mstatus;
 
     env->mpmmask = val;
+    if ((env->priv == PRV_M) && (env->mmte & M_PM_ENABLE)) {
+        env->cur_pmmask = val;
+    }
     env->mmte |= PM_EXT_DIRTY;
 
     /* Set XS and SD bits, since PM CSRs are dirty */
@@ -1707,6 +1711,9 @@ static RISCVException write_spmmask(CPURISCVState *env, int csrno,
         return RISCV_EXCP_NONE;
     }
     env->spmmask = val;
+    if ((env->priv == PRV_S) && (env->mmte & S_PM_ENABLE)) {
+        env->cur_pmmask = val;
+    }
     env->mmte |= PM_EXT_DIRTY;
 
     /* Set XS and SD bits, since PM CSRs are dirty */
@@ -1732,6 +1739,9 @@ static RISCVException write_upmmask(CPURISCVState *env, int csrno,
         return RISCV_EXCP_NONE;
     }
     env->upmmask = val;
+    if ((env->priv == PRV_U) && (env->mmte & U_PM_ENABLE)) {
+        env->cur_pmmask = val;
+    }
     env->mmte |= PM_EXT_DIRTY;
 
     /* Set XS and SD bits, since PM CSRs are dirty */
@@ -1753,6 +1763,9 @@ static RISCVException write_mpmbase(CPURISCVState *env, int csrno,
     uint64_t mstatus;
 
     env->mpmbase = val;
+    if ((env->priv == PRV_M) && (env->mmte & M_PM_ENABLE)) {
+        env->cur_pmbase = val;
+    }
     env->mmte |= PM_EXT_DIRTY;
 
     /* Set XS and SD bits, since PM CSRs are dirty */
@@ -1778,6 +1791,9 @@ static RISCVException write_spmbase(CPURISCVState *env, int csrno,
         return RISCV_EXCP_NONE;
     }
     env->spmbase = val;
+    if ((env->priv == PRV_S) && (env->mmte & S_PM_ENABLE)) {
+        env->cur_pmbase = val;
+    }
     env->mmte |= PM_EXT_DIRTY;
 
     /* Set XS and SD bits, since PM CSRs are dirty */
@@ -1803,6 +1819,9 @@ static RISCVException write_upmbase(CPURISCVState *env, int csrno,
         return RISCV_EXCP_NONE;
     }
     env->upmbase = val;
+    if ((env->priv == PRV_U) && (env->mmte & U_PM_ENABLE)) {
+        env->cur_pmbase = val;
+    }
     env->mmte |= PM_EXT_DIRTY;
 
     /* Set XS and SD bits, since PM CSRs are dirty */

target/riscv/machine.c

@@ -220,6 +220,7 @@ static int riscv_cpu_post_load(void *opaque, int version_id)
     CPURISCVState *env = &cpu->env;
 
     env->xl = cpu_recompute_xl(env);
+    riscv_cpu_update_mask(env);
     return 0;
 }