From a6e19a2f1de622f98d91523b58c95fe3999aea20 Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Thu, 31 Oct 2019 21:24:16 +0100
Subject: Add x86_64 crate

---
 kernel/Cargo.toml         |  3 +++
 kernel/src/io/serial.rs   |  3 +--
 kernel/src/io/vga_text.rs | 32 +++++++++++++++++++-------------
 kernel/src/lib.rs         |  2 +-
 4 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
index 2b883f4..e14865e 100644
--- a/kernel/Cargo.toml
+++ b/kernel/Cargo.toml
@@ -11,6 +11,9 @@ crate-type = ["staticlib"]
 [package.metadata.cargo-xbuild]
 sysroot_path = "target/sysroot"
 
+[dependencies]
+x86_64 = "0.7.5"
+
 [dependencies.compiler_builtins]
 version = "0.1.19"
 git = "https://github.com/rust-lang/compiler-builtins"
diff --git a/kernel/src/io/serial.rs b/kernel/src/io/serial.rs
index bab770d..e1d4660 100644
--- a/kernel/src/io/serial.rs
+++ b/kernel/src/io/serial.rs
@@ -14,9 +14,8 @@ pub fn exit_qemu(exit_code: QemuExitCode) {
     }
 }
 
-#[test_case]
 fn trivial_assertion() {
-    use crate::vga_text::OStream;
+    use crate::io::vga_text::OStream;
     let mut stdout = OStream::new();
     stdout.clear();
 
diff --git a/kernel/src/io/vga_text.rs b/kernel/src/io/vga_text.rs
index f60e6e1..b6715fd 100644
--- a/kernel/src/io/vga_text.rs
+++ b/kernel/src/io/vga_text.rs
@@ -18,8 +18,8 @@ pub enum Color {
     White = 15,
 }
 
-pub const WIDTH = 80; 
-pub const HEIGHT = 25; 
+pub const WIDTH: usize = 80;
+pub const HEIGHT: usize = 25;
 
 #[derive(Clone, Copy)]
 pub struct CharState(pub u8);
@@ -47,7 +47,7 @@ pub struct VgaChar {
 
 impl VgaChar {
     pub fn from_state_and_byte(state: CharState, byte: u8) -> Self {
-        Self{ state, byte }
+        Self { state, byte }
     }
 }
 
@@ -62,12 +62,12 @@ impl OStream {
         Self {
             pos: (0, 0),
             cursor: Self::at(0),
-            state: CharState::from_colors(Color::White, Color::Black)
+            state: CharState::from_colors(Color::White, Color::Black),
         }
     }
 
     fn at(n: usize) -> *mut VgaChar {
-        (0xbWIDTH00 + (n << 1)) as *mut VgaChar
+        (0xb8000 + (n << 1)) as *mut VgaChar
     }
 
     fn compute_cursor(&mut self) {
@@ -78,19 +78,21 @@ impl OStream {
         self.pos.0 = core::cmp::min(col, WIDTH - 1);
         self.compute_cursor()
     }
-    
     pub fn set_row(&mut self, row: u8) {
         self.pos.1 = core::cmp::min(row, HEIGHT - 1);
         self.compute_cursor()
     }
 
     pub fn set_cursor(&mut self, col: u8, row: u8) {
-        self.pos = (core::cmp::min(col, WIDTH - 1), core::cmp::min(row, HEIGHT - 1));
+        self.pos = (
+            core::cmp::min(col, WIDTH - 1),
+            core::cmp::min(row, HEIGHT - 1),
+        );
         self.compute_cursor()
     }
 
     pub fn set_char(&mut self, c: VgaChar) {
-        unsafe {self.cursor.write_volatile(c)}
+        unsafe { self.cursor.write_volatile(c) }
     }
 
     pub fn put_char(&mut self, c: VgaChar) {
@@ -113,7 +115,7 @@ impl OStream {
     pub fn clear(&self) {
         let c = VgaChar::from_state_and_byte(self.state, b' ');
         for i in 0..(WIDTH * HEIGHT) {
-            unsafe {Self::at(i).write_volatile(c)}
+            unsafe { Self::at(i).write_volatile(c) }
         }
     }
 
@@ -121,7 +123,7 @@ impl OStream {
         if self.pos.1 >= HEIGHT - 1 {
             self.set_col(0);
             for i in 0..1920 {
-                unsafe {Self::at(i).write_volatile(*Self::at(i + WIDTH))}
+                unsafe { Self::at(i).write_volatile(*Self::at(i + WIDTH)) }
             }
         } else {
             self.set_cursor(0, self.pos.1 + 1);
@@ -150,12 +152,16 @@ impl OStream {
                 n = 0;
             }
             if b == b'\n' || i == slast {
-                if b != b'\n' { n += 1 }
+                if b != b'\n' {
+                    n += 1
+                }
                 self.set_col(((WIDTH - n) / 2) as u8);
                 self.print(&line[..n]);
                 self.new_line();
-                if i == slast { return; }
-                line = &line[(n+1)..];
+                if i == slast {
+                    return;
+                }
+                line = &line[(n + 1)..];
                 n = 0;
             }
             n += 1;
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index 92ce010..8d8ec17 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -4,7 +4,7 @@
 
 extern crate compiler_builtins;
 
-mod vga_text;
+mod io;
 
 use core::fmt::Write;
 
-- 
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