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Macros
#define	TEXT_STATIC 0
#define	TEXT_BLINKING 1
#define	TEXT_BLACK 0 /* 0000 */
#define	TEXT_BLUE 1 /* 0001 */
#define	TEXT_GREEN 2 /* 0010 */
#define	TEXT_CYAN 3 /* 0011 */
#define	TEXT_RED 4 /* 0100 */
#define	TEXT_MAGENTA 5 /* 0101 */
#define	TEXT_BROWN 6 /* 0110 */
#define	TEXT_LIGHT_GRAY 7 /* 0111 */
#define	TEXT_DARK_GRAY 8 /* 1000 */
#define	TEXT_LIGHT_BLUE 9 /* 1001 */
#define	TEXT_LIGHT_GREEN 10 /* 1010 */
#define	TEXT_LIGHT_CYAN 11 /* 1011 */
#define	TEXT_LIGHT_RED 12 /* 1100 */
#define	TEXT_LIGHT_MAGENTA 13 /* 1101 */
#define	TEXT_YELLOW 14 /* 1110 */
#define	TEXT_WHITE 15 /* 1111 */
#define	TEXT_ATTR(textcolor, bgcolor, blinking)
#define	DEFAULT_TEXT_ATTR (TEXT_ATTR(TEXT_LIGHT_GRAY, TEXT_BLACK, TEXT_STATIC))
#define	SCREEN_ROWS 25 /* VGA text mode rows */
#define	SCREEN_COLS 80 /* VGA text mode columns */
#define	VGA_CURSOR_PORT_IDX 0x3D4 /* CRT index register */
#define	VGA_CURSOR_PORT_DATA 0x3D5 /* CRT data register */
#define	VGA_CUR_START_REG 0x0A /* cursor start scanline register */
#define	VGA_CUR_HIGH_REG 0x0E /* cursor high byte register */
#define	VGA_CUR_LOW_REG 0x0F /* cursor low byte register */
#define	VGA_CUR_DISABLE (1 << 5) /* bit 5 of start register disables cursor */
#define	VGA_CUR_END_REG 0x0B /* cursor end scanline register */
#define	VGA_CUR_START_LINE 14 /* underline style: start scanline */
#define	VGA_CUR_END_LINE 15 /* underline style: end scanline */
#define	COM1_PORT 0x3F8 /* COM1 base I/O port */
#define	COM_LSR_OFFSET 5 /* Line Status Register offset from COM1_PORT */
#define	COM_LSR_THRE 0x20 /* Transmitter Holding Register Empty (TX ready) */

Functions
void	console_init (void)
	Sets cursor position to (0,0), initialises the 16550 UART at COM1_PORT (0x3F8) to 9600 baud 8N1, clears the VGA framebuffer using vt_init(), and enables the hardware cursor. Called once at boot before any printk output.
void	console_clear (void)
	Fills all 80x25 cells with DEFAULT_TEXT_ATTR space characters and calls vt_clear() to reset the VT parser state and hardware cursor.
void	console_putchar (char c)
	Handles newline, carriage return, backspace, and scrolling via the VT core.
void	console_puts (char *s)
	Iterates over @s until the null terminator, calling console_putchar() for each character.
void	console_show_cursor (void)
	Writes scanline range VGA_CUR_START_LINE..VGA_CUR_END_LINE to CRT registers 0x0A and 0x0B, making an underline cursor visible at the current position.
void	console_hide_cursor (void)
	Sets VGA_CUR_DISABLE (bit 5) in CRT register 0x0A, making the hardware cursor invisible. Used when the terminal is in an intermediate state.

Macros

Functions