diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..1e08526
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "burritos"
+version = "0.1.0"
diff --git a/src/decode.rs b/src/decode.rs
new file mode 100644
index 0000000..ed21275
--- /dev/null
+++ b/src/decode.rs
@@ -0,0 +1,57 @@
+pub struct Instruction {
+    value : u64,
+
+    opcode : u8, 
+    rs1 : u8, 
+    rs2 : u8, 
+    rs3 : u8, 
+    rd : u8, 
+    funct7 : u8, 
+    funct7_smaller : u8, 
+    funct3 : u8, 
+    shamt : u8,
+
+    imm12_I : u16,
+    imm12_S : u16,
+
+    imm12_I_signed : i16, 
+    imm12_S_signed : i16, 
+    imm13 : i16, 
+    imm13_signed : i16,
+
+    imm31_12 : u32, 
+    imm21_1 : u32,
+
+    imm31_12_signed : i32, 
+    imm21_1_signed : i32,
+}
+
+pub fn decode(val : u64) -> Instruction {
+    Instruction {
+        value : val,
+
+        opcode : 0, 
+        rs1 : 0, 
+        rs2 : 0, 
+        rs3 : 0, 
+        rd : 0, 
+        funct7 : 0, 
+        funct7_smaller : 0, 
+        funct3 : 0, 
+        shamt : 0,
+
+        imm12_I : 0,
+        imm12_S : 0,
+
+        imm12_I_signed : 0, 
+        imm12_S_signed : 0, 
+        imm13 : 0, 
+        imm13_signed : 0,
+
+        imm31_12 : 0, 
+        imm21_1 : 0,
+
+        imm31_12_signed : 0, 
+        imm21_1_signed : 0,
+    }
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..9c521f7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,6 @@
+mod decode;
+
 fn main() {
+    let instr = decode::decode(98);
     println!("Hello, world!");
 }