rocket: separate page faults from physical memory access exceptions

src/main/scala/rocket/Instructions.scala

@@ -216,31 +216,37 @@ object Instructions {
 }
 object Causes {
   val misaligned_fetch = 0x0
-  val fault_fetch = 0x1
+  val fetch_access = 0x1
   val illegal_instruction = 0x2
   val breakpoint = 0x3
   val misaligned_load = 0x4
-  val fault_load = 0x5
+  val load_access = 0x5
   val misaligned_store = 0x6
-  val fault_store = 0x7
+  val store_access = 0x7
   val user_ecall = 0x8
   val supervisor_ecall = 0x9
   val hypervisor_ecall = 0xa
   val machine_ecall = 0xb
+  val fetch_page_fault = 0xc
+  val load_page_fault = 0xd
+  val store_page_fault = 0xf
   val all = {
     val res = collection.mutable.ArrayBuffer[Int]()
     res += misaligned_fetch
-    res += fault_fetch
+    res += fetch_access
     res += illegal_instruction
     res += breakpoint
     res += misaligned_load
-    res += fault_load
+    res += load_access
     res += misaligned_store
-    res += fault_store
+    res += store_access
     res += user_ecall
     res += supervisor_ecall
     res += hypervisor_ecall
     res += machine_ecall
+    res += fetch_page_fault
+    res += load_page_fault
+    res += store_page_fault
     res.toArray
   }
 }