Load and recognize a minimal set of instructions

1 files changed, 12 insertions, 1 deletions

diff --git a/src/isa/mod.rs b/src/isa/mod.rs
index 5e9a7dc..ac8ce45 100644
--- a/src/isa/mod.rs
+++ b/src/isa/mod.rs
@@ -1,6 +1,7 @@
 pub mod opcodes;
+pub mod funct3;
 
-enum Register {
+pub enum Register {
     X0 = 0,
     X1 = 1,
     X2 = 2,
@@ -15,6 +16,12 @@ enum Register {
     X11 = 11,
 }
 
+impl Register {
+    pub fn as_num(self) -> usize {
+        self as usize
+    }
+}
+
 pub struct Instruction {
     word: u32,
 }
@@ -29,4 +36,8 @@ impl Instruction {
     pub fn opcode(&self) -> u32 {
         self.word & 0x7F
     }
+
+    pub fn funct3(&self) -> u32 {
+        (self.word >> 12) & 0x3
+    }
 }