From 65c824e10470457c91a8f16866b529d158912d88 Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Wed, 10 Jul 2019 02:27:20 -0700
Subject: [PATCH] Add volatile crate

---
 Cargo.toml        | 1 +
 src/vga_buffer.rs | 8 +++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index aef2c8f..730999c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,4 +12,5 @@ panic = "abort"
 
 [dependencies]
 bootloader = "0.6.0"
+volatile = "0.2.6"
 
diff --git a/src/vga_buffer.rs b/src/vga_buffer.rs
index 34227e2..c34f01c 100644
--- a/src/vga_buffer.rs
+++ b/src/vga_buffer.rs
@@ -1,3 +1,5 @@
+use volatile::Volatile;
+
 #[allow(dead_code)]
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 #[repr(u8)]
@@ -42,7 +44,7 @@ const BUFFER_HEIGHT: usize = 25;
 
 #[repr(transparent)]
 struct Buffer {
-  chars: [[ScreenChar; BUFFER_WIDTH]; BUFFER_HEIGHT],
+  chars: [[Volatile<ScreenChar>; BUFFER_WIDTH]; BUFFER_HEIGHT],
 }
 
 pub struct Writer {
@@ -71,9 +73,9 @@ impl Writer {
         let row = BUFFER_HEIGHT - 1;
         let col = self.column_position;
         let color_code = self.color_code;
-        self.buffer.chars[row][col] = ScreenChar {
+        self.buffer.chars[row][col].write(ScreenChar {
           ascii_char: byte, color_code,
-        };
+        });
         self.column_position += 1;
       }
     }