Fixed time csr handling

src/iss/rv32gc.cpp

@@ -66,7 +66,7 @@ void rv32gc::reset(uint64_t address) {
     reg.PC=address;
     reg.NEXT_PC=reg.PC;
     reg.trap_state=0;
-    reg.machine_state=0x0;
+    reg.machine_state=0x3;
     reg.icount=0;
 }
 

src/iss/rv64gc.cpp

@@ -67,7 +67,7 @@ void rv64gc::reset(uint64_t address) {
     reg.PC=address;
     reg.NEXT_PC=reg.PC;
     reg.trap_state=0;
-    reg.machine_state=0x0;
+    reg.machine_state=0x3;
     reg.icount=0;
 }
 

src/iss/rv64i.cpp

@@ -65,7 +65,7 @@ void rv64i::reset(uint64_t address) {
     reg.PC=address;
     reg.NEXT_PC=reg.PC;
     reg.trap_state=0;
-    reg.machine_state=0x0;
+    reg.machine_state=0x3;
     reg.icount=0;
 }
 

src/sysc/core_complex.cpp

@@ -93,7 +93,9 @@ public:
     using base_type = arch::riscv_hart_msu_vp<arch::rv32imac>;
     using phys_addr_t = typename arch::traits<arch::rv32imac>::phys_addr_t;
     core_wrapper(core_complex *owner)
-    : owner(owner) {}
+    : owner(owner) 
+    {
+    }
 
     uint32_t get_mode() { return this->reg.machine_state; }
 
@@ -144,6 +146,22 @@ public:
         }
     }
 
+    status read_csr(unsigned addr, reg_t &val) override {
+        if((addr==arch::time || addr==arch::timeh) && owner->mtime_o.get_interface(0)){
+            uint64_t time_val;
+            bool ret = owner->mtime_o->nb_peek(time_val);
+            if (addr == iss::arch::time) {
+                val = static_cast<reg_t>(time_val);
+            } else if (addr == iss::arch::timeh) {
+                if (sizeof(reg_t) != 4) return iss::Err;
+                val = static_cast<reg_t>(time_val >> 32);
+            }
+            return ret?Ok:Err;
+        } else {
+            return base_type::read_csr(addr, val);
+        }
+    }
+
     void wait_until(uint64_t flags) override {
         SCDEBUG(owner->name()) << "Sleeping until interrupt";
         do {