Rewrite drivers/uart and drivers/vga in cpp

1 files changed, 51 insertions, 0 deletions

diff --git a/devices/vga.hpp b/devices/vga.hpp
new file mode 100644
index 0000000..5287d73
--- /dev/null
+++ b/devices/vga.hpp
@@ -0,0 +1,51 @@
+#pragma once
+
+#include <stdio.h>
+
+/** Hardware text mode color constants. */
+enum vga_color {
+  VGA_COLOR_BLACK = 0,
+  VGA_COLOR_BLUE = 1,
+  VGA_COLOR_GREEN = 2,
+  VGA_COLOR_CYAN = 3,
+  VGA_COLOR_RED = 4,
+  VGA_COLOR_MAGENTA = 5,
+  VGA_COLOR_BROWN = 6,
+  VGA_COLOR_LIGHT_GREY = 7,
+  VGA_COLOR_DARK_GREY = 8,
+  VGA_COLOR_LIGHT_BLUE = 9,
+  VGA_COLOR_LIGHT_GREEN = 10,
+  VGA_COLOR_LIGHT_CYAN = 11,
+  VGA_COLOR_LIGHT_RED = 12,
+  VGA_COLOR_LIGHT_MAGENTA = 13,
+  VGA_COLOR_LIGHT_BROWN = 14,
+  VGA_COLOR_WHITE = 15,
+};
+
+FILE *vga_init(void *buffer);
+
+struct VGA : public kIoDevice {
+  VGA(void *addr);
+
+  void putc(char a) override;
+  int puts(const char *string, int length) override;
+  void
+  flush() override
+  {
+    update_cursor();
+  }
+
+  struct __attribute__((packed)) VGAEntry {
+    unsigned char text;
+    unsigned char foreground : 4;
+    unsigned char background : 4;
+  };
+
+private:
+  void clear(enum vga_color foreground, enum vga_color background);
+  void update_cursor();
+
+  struct VGAEntry *buffer;
+  int col = 0;
+  int row = 0;
+};