Add Console class

src/Console.cc

@@ -0,0 +1,49 @@
+/* Console.cc
+ * vim: set tw=80:
+ * Eryn Wells <eryn@erynwells.me>
+ */
+/**
+ * Implementation of the Console class.
+ */
+
+#include "Console.hh"
+
+/** Create a VGA color pair. */
+static inline uint8_t
+makeVGAColor(Console::Color fg,
+             Console::Color bg)
+{
+    return fg | bg << 4;
+}
+
+/** Create a VGA character entry. */
+static inline uint16_t
+makeVGAEntry(char c,
+             uint8_t color)
+{
+    uint16_t c16 = c;
+    uint16_t color16 = color;
+    return c16 | color16 << 8;
+}
+
+
+namespace kernel {
+
+Console::Console()
+    : mBase(0xB8000),
+      mCursor({0, 0})
+{ }
+
+
+Console::clear(Console::Color color)
+{
+    const uint16_t color = makeVGAColor(Color::LightGray, Color::Blue);
+    for (size_t y = 0; y < Console::Height; y++) {
+        for (size_t x = 0; x < Console::Width; x++) {
+            const size_t index = y * Console::Width + x;
+            mBase[index] = makeVGAEntry(' ', color);
+        }
+    }
+}
+
+} /* namespace kernel */

src/Console.hh

@@ -0,0 +1,50 @@
+/* Console.hh
+ * vim: set tw=80:
+ * Eryn Wells <eryn@erynwells.me>
+ */
+/**
+ * Declaration of the Console class. Presents an API for a VGA console.
+ */
+
+namespace kernel {
+
+struct Console
+{
+    enum class 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,
+        LightMagenta = 13,
+        LightBrown = 14,
+        White = 15
+    };
+
+    struct Cursor
+    {
+        size_t row, col;
+    };
+
+    static const size_t Width = 80;
+    static const size_t Height = 25;
+
+    Console();
+
+    /** Clear the console to the provided color. */
+    clear(Color color = Color::Black);
+
+private:
+    uint16_t *const mBase;
+    Cursor mCursor;
+};
+    
+} /* namespace kernel */