Initial commit. Add registers

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ferris-boi"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "ferris-boi"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/lib.rs

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+#![warn(clippy::all, clippy::pedantic)]
+
+mod register;

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

src/register.rs

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+//! The register module Holds the basic [`Registers`] type and functions needed
+//! to access/manipulate them
+
+const INITIAL_PROGRAM_COUNTER_VALUE: u16 = 0x100;
+
+/// Registers holds all of the registers for the Gameboy
+#[derive(Debug, Clone)]
+pub struct Registers {
+    pub a: u8,
+    pub b: u8,
+    pub c: u8,
+    pub d: u8,
+    pub e: u8,
+    pub f: u8,
+    pub h: u8,
+    pub l: u8,
+    pub stack_pointer: u16,
+    pub program_counter: u16,
+    flags: u8,
+}
+
+impl Registers {
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
+impl Default for Registers {
+    fn default() -> Self {
+        // TODO: verify that these 0 values are correct. I feel like they must
+        // be, but I haven't read enough of the manual
+        Registers {
+            a: 0,
+            b: 0,
+            c: 0,
+            d: 0,
+            e: 0,
+            f: 0,
+            h: 0,
+            l: 0,
+            stack_pointer: 0,
+            program_counter: INITIAL_PROGRAM_COUNTER_VALUE,
+            flags: 0,
+        }
+    }
+}