do-core1: Initial do-core crate

With a minimal content, just our opcodes.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Author: Samuel Ortiz

Cargo.lock

@@ -7,4 +7,5 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-clap = { version = "3.0.5", features = ["derive"] }
+clap = { version = "3.0.5", features = ["derive"] }
+do-core = { path = "do-core" }

Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "do-core"
+version = "0.1.0"
+authors = ["Samuel Ortiz <sameo@linux.intel.com>"]
+edition = "2018"
+
+[dependencies]

do-core/Cargo.toml

@@ -0,0 +1,22 @@
+use crate::Error;
+
+#[allow(dead_code)]
+#[derive(Clone, Debug, PartialEq)]
+pub enum OpCode {
+    LD = 0x00,
+    ST = 0x01,
+    ADD = 0x02,
+    XOR = 0x03,
+}
+
+impl OpCode {
+    pub fn from_u8(opcode: u8) -> Result<OpCode, Error> {
+        match opcode {
+            0x00 => Ok(OpCode::LD),
+            0x01 => Ok(OpCode::ST),
+            0x02 => Ok(OpCode::ADD),
+            0x03 => Ok(OpCode::XOR),
+            _ => Err(Error::InvalidOpCode(opcode)),
+        }
+    }
+}

do-core/src/instruction.rs

@@ -0,0 +1,9 @@
+#[derive(Debug)]
+pub enum Error {
+    InvalidOpCode(u8),
+    Op0OutOfRange,
+    Op1OutOfRange,
+    AdditionOverflow(u32, u32),
+}
+
+pub mod instruction;