System console is back

src/Console.cc

@@ -30,15 +30,19 @@ makeVGAEntry(char c,
 }
 
 /*
- * Public
+ * Static
  */
 
-Console::Console()
-    : mBase(reinterpret_cast<uint16_t *>(0xB8000)),
-      mCursor{0, 0},
-      mColor(makeVGAColor(Console::Color::LightGray, Console::Color::Black))
-{ }
+Console &
+Console::systemConsole()
+{
+    static Console sSystemConsole;
+    return sSystemConsole;
+}
 
+/*
+ * Public
+ */
 
 void
 Console::clear()
@@ -114,6 +118,13 @@ Console::setColor(Console::Color fg,
  * Private
  */
 
+Console::Console()
+    : mBase(reinterpret_cast<uint16_t *>(0xB8000)),
+      mCursor{0, 0},
+      mColor(makeVGAColor(Console::Color::LightGray, Console::Color::Black))
+{ }
+
+
 void
 Console::putEntryAt(size_t x,
                     size_t y,

src/Console.hh

@@ -41,7 +41,7 @@ struct Console
     static const size_t Width = 80;
     static const size_t Height = 25;
 
-    Console();
+    static Console &systemConsole();
 
     /** Clear the console to the provided color. */
     void clear();
@@ -60,6 +60,8 @@ private:
     Cursor mCursor;
     uint8_t mColor;
 
+    Console();
+
     void putEntryAt(size_t x, size_t y, char c, uint8_t color);
     void scroll(size_t lines = 1);
 };

src/Main.cc

@@ -15,7 +15,7 @@ extern "C"
 void
 kearly()
 {
-    kernel::Console console;
+    auto console = kernel::Console::systemConsole();
     console.clear(kernel::Console::Color::Blue);
     console.writeString("Loading system ...\n");