[v15,3/7] target/riscv: Add helper functions to calculate current number of masked bits for pointer masking

Commit Message

Alexey Baturo Jan. 6, 2025, 10:23 a.m. UTC

From: Alexey Baturo <[e-mail]>

Signed-off-by: Alexey Baturo <[e-mail]>
Reviewed-by: Daniel Henrique Barboza <[e-mail]>
Reviewed-by: Alistair Francis <[e-mail]>
---
 target/riscv/cpu.h        |  5 +++
 target/riscv/cpu_helper.c | 78 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)

Patch

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index a3aca8a222..7c7feba54f 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -771,8 +771,13 @@  void cpu_get_tb_cpu_state(CPURISCVState *env, vaddr *pc,
 
 bool riscv_cpu_is_32bit(RISCVCPU *cpu);
 
+bool riscv_cpu_virt_mem_enabled(CPURISCVState *env);
+RISCVPmPmm riscv_pm_get_pmm(CPURISCVState *env);
+uint32_t riscv_pm_get_pmlen(RISCVPmPmm pmm);
+
 RISCVException riscv_csrr(CPURISCVState *env, int csrno,
                           target_ulong *ret_value);
+
 RISCVException riscv_csrrw(CPURISCVState *env, int csrno,
                            target_ulong *ret_value,
                            target_ulong new_value, target_ulong write_mask);
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 8c1969294f..0e030d4ecb 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -214,6 +214,84 @@  void cpu_get_tb_cpu_state(CPURISCVState *env, vaddr *pc,
     *pflags = flags;
 }
 
+RISCVPmPmm riscv_pm_get_pmm(CPURISCVState *env)
+{
+#ifndef CONFIG_USER_ONLY
+    int priv_mode = cpu_address_mode(env);
+
+    if (get_field(env->mstatus, MSTATUS_MPRV) &&
+        get_field(env->mstatus, MSTATUS_MXR)) {
+        return PMM_FIELD_DISABLED;
+    }
+
+    /* Get current PMM field */
+    switch (priv_mode) {
+    case PRV_M:
+        if (riscv_cpu_cfg(env)->ext_smmpm) {
+            return get_field(env->mseccfg, MSECCFG_PMM);
+        }
+        break;
+    case PRV_S:
+        if (riscv_cpu_cfg(env)->ext_smnpm) {
+            if (get_field(env->mstatus, MSTATUS_MPV)) {
+                return get_field(env->henvcfg, HENVCFG_PMM);
+            } else {
+                return get_field(env->menvcfg, MENVCFG_PMM);
+            }
+        }
+        break;
+    case PRV_U:
+        if (riscv_has_ext(env, RVS)) {
+            if (riscv_cpu_cfg(env)->ext_ssnpm) {
+                return get_field(env->senvcfg, SENVCFG_PMM);
+            }
+        } else {
+            if (riscv_cpu_cfg(env)->ext_smnpm) {
+                return get_field(env->menvcfg, MENVCFG_PMM);
+            }
+        }
+        break;
+    default:
+        g_assert_not_reached();
+    }
+    return PMM_FIELD_DISABLED;
+#else
+    return PMM_FIELD_DISABLED;
+#endif
+}
+
+bool riscv_cpu_virt_mem_enabled(CPURISCVState *env)
+{
+#ifndef CONFIG_USER_ONLY
+    int satp_mode = 0;
+    int priv_mode = cpu_address_mode(env);
+
+    if (riscv_cpu_mxl(env) == MXL_RV32) {
+        satp_mode = get_field(env->satp, SATP32_MODE);
+    } else {
+        satp_mode = get_field(env->satp, SATP64_MODE);
+    }
+
+    return ((satp_mode != VM_1_10_MBARE) && (priv_mode != PRV_M));
+#else
+    return false;
+#endif
+}
+
+uint32_t riscv_pm_get_pmlen(RISCVPmPmm pmm)
+{
+    switch (pmm) {
+    case PMM_FIELD_DISABLED:
+        return 0;
+    case PMM_FIELD_PMLEN7:
+        return 7;
+    case PMM_FIELD_PMLEN16:
+        return 16;
+    default:
+        g_assert_not_reached();
+    }
+}
+
 #ifndef CONFIG_USER_ONLY
 
 /*