From 15061f45c8a62afbe8cbe29293a0e466644830fb Mon Sep 17 00:00:00 2001
From: Michael Zhang <mail@mzhang.io>
Date: Mon, 7 Dec 2020 00:08:12 -0600
Subject: [PATCH] phil OPP

---
 .cargo/config.toml |  9 +++++++++
 .gitignore         |  1 +
 Cargo.lock         | 21 +++++++++++++++++++++
 Cargo.toml         | 15 +++++++++++++++
 Makefile           | 10 ++++++++++
 rust-toolchain     |  1 +
 src/main.rs        | 29 +++++++++++++++++++++++++++++
 src/vga_buffer.rs  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 target.json        | 15 +++++++++++++++
 9 files changed, 147 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 Makefile
 create mode 100644 rust-toolchain
 create mode 100644 src/main.rs
 create mode 100644 src/vga_buffer.rs
 create mode 100644 target.json

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..09f68c0
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,9 @@
+[build]
+target = "target.json"
+
+[unstable]
+build-std = ["core", "compiler_builtins"]
+
+[target.'cfg(target_os = "none")']
+runner = "bootimage runner"
+
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..cd4c128
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,21 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "bootloader"
+version = "0.9.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83732ad599045a978528e4311539fdcb20c30e406b66d1d08cd4089d4fc8d90f"
+
+[[package]]
+name = "toymk"
+version = "0.1.0"
+dependencies = [
+ "bootloader",
+ "volatile",
+]
+
+[[package]]
+name = "volatile"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b53d47a0f279fc0a9d9d1d82f4c6f313eb63b73e2a85d9c27fd609084cfa08f"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..d9bf954
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "toymk"
+version = "0.1.0"
+authors = ["Michael Zhang <mail@mzhang.io>"]
+edition = "2018"
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"
+
+[dependencies]
+bootloader = "0.9.11"
+volatile = "0.4.2"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..02e4281
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,10 @@
+TARGET_TRIPLE = target.json
+
+all:
+	cargo build --target $(TARGET_TRIPLE)
+
+
+watch:
+	cargo watch -x "check --target $(TARGET_TRIPLE)"
+
+.PHONY: watch
diff --git a/rust-toolchain b/rust-toolchain
new file mode 100644
index 0000000..bf867e0
--- /dev/null
+++ b/rust-toolchain
@@ -0,0 +1 @@
+nightly
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..140eec7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+
+mod vga_buffer;
+
+use core::panic::PanicInfo;
+
+use crate::vga_buffer::{Color, ColorCode};
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
+
+static HELLO: &[u8] = b"Hello World!";
+
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
+    let vga_buffer = 0xb8000 as *mut u8;
+
+    for (i, &byte) in HELLO.iter().enumerate() {
+        unsafe {
+            *vga_buffer.offset(i as isize * 2) = byte;
+            *vga_buffer.offset(i as isize * 2 + 1) = 0x7;
+        }
+    }
+
+    loop {}
+}
diff --git a/src/vga_buffer.rs b/src/vga_buffer.rs
new file mode 100644
index 0000000..6847744
--- /dev/null
+++ b/src/vga_buffer.rs
@@ -0,0 +1,46 @@
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(C)]
+pub struct ScreenChar {
+    ascii_character: u8,
+    color_code: ColorCode,
+}
+
+const BUFFER_HEIGHT: usize = 25;
+const BUFFER_WIDTH: usize = 80;
+
+#[repr(transparent)]
+pub struct Buffer {
+    chars: [[ScreenChar; BUFFER_WIDTH]; BUFFER_HEIGHT],
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(transparent)]
+pub struct ColorCode(u8);
+
+impl ColorCode {
+    fn new(foreground: Color, background: Color) -> ColorCode {
+        ColorCode((background as u8) << 4 | (foreground as u8))
+    }
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u8)]
+pub enum Color {
+    Black = 0,
+    Blue = 1,
+    Green = 2,
+    Cyan = 3,
+    Red = 4,
+    Magenta = 5,
+    Brown = 6,
+    LightGray = 7,
+    DarkGray = 8,
+    LightBlue = 9,
+    LightGreen = 10,
+    LightCyan = 11,
+    LightRed = 12,
+    Pink = 13,
+    Yellow = 14,
+    White = 15,
+}
diff --git a/target.json b/target.json
new file mode 100644
index 0000000..7d2110d
--- /dev/null
+++ b/target.json
@@ -0,0 +1,15 @@
+{
+  "llvm-target": "x86_64-unknown-none",
+  "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
+  "arch": "x86_64",
+  "target-endian": "little",
+  "target-pointer-width": "64",
+  "target-c-int-width": "32",
+  "os": "none",
+  "executables": true,
+  "linker-flavor": "ld.lld",
+  "linker": "rust-lld",
+  "panic-strategy": "abort",
+  "disable-redzone": true,
+  "features": "-mmx,-sse,+soft-float"
+}