From fc710000a4017dd8060b9d88db5ac50e4204e58c Mon Sep 17 00:00:00 2001
From: Nick Krichevsky <nick@ollien.com>
Date: Fri, 1 Apr 2022 18:10:56 -0400
Subject: [PATCH] Initial commit. Add registers

---
 .gitignore      |  1 +
 Cargo.lock      |  7 +++++++
 Cargo.toml      |  8 ++++++++
 src/lib.rs      |  3 +++
 src/main.rs     |  3 +++
 src/register.rs | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 68 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs
 create mode 100644 src/main.rs
 create mode 100644 src/register.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..12e2cc3
--- /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 = "ferris-boi"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f874040
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[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]
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ef1a3bf
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,3 @@
+#![warn(clippy::all, clippy::pedantic)]
+
+mod register;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}
diff --git a/src/register.rs b/src/register.rs
new file mode 100644
index 0000000..b57be83
--- /dev/null
+++ b/src/register.rs
@@ -0,0 +1,46 @@
+//! 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,
+        }
+    }
+}