313aeb5872
- Created VGA driver that writes to the 0xB8000 text-mode framebuffer.
Supports 80x25 display with 16 foreground/background colors, scrolling,
hardware cursor updates, and special characters (\n, \r, \t, \b).
- Provides vga_puts, vga_putchar, vga_put_hex, vga_put_dec, vga_set_color.
- Displays boot banner ("ClaudeOS v0.1 booting...") on screen clear.
- vga_show_mem_stats() prints total RAM, kernel start/end addresses, and
kernel size on the VGA display during boot.
- Registered as the first driver using REGISTER_DRIVER, proving the
driver framework works end-to-end (probe -> init lifecycle).
Tested: driver loads successfully, debug port confirms vga probe/init.
98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
/**
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* @file vga.h
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* @brief VGA text-mode driver interface.
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*
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* Provides functions to write text to the VGA text-mode framebuffer
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* (typically at 0xB8000). Supports an 80x25 character display with
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* 16 foreground and 16 background colors.
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*/
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#ifndef VGA_H
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#define VGA_H
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#include <stdint.h>
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#include <stddef.h>
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/** VGA color constants. */
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typedef enum {
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VGA_BLACK = 0,
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VGA_BLUE = 1,
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VGA_GREEN = 2,
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VGA_CYAN = 3,
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VGA_RED = 4,
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VGA_MAGENTA = 5,
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VGA_BROWN = 6,
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VGA_LIGHT_GREY = 7,
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VGA_DARK_GREY = 8,
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VGA_LIGHT_BLUE = 9,
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VGA_LIGHT_GREEN = 10,
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VGA_LIGHT_CYAN = 11,
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VGA_LIGHT_RED = 12,
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VGA_LIGHT_MAGENTA = 13,
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VGA_YELLOW = 14,
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VGA_WHITE = 15,
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} vga_color_t;
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/** VGA screen dimensions. */
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#define VGA_WIDTH 80
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#define VGA_HEIGHT 25
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/**
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* Initialize the VGA driver.
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*
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* Clears the screen and sets the default colors.
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*
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* @return 0 on success.
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*/
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int vga_init(void);
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/**
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* Clear the VGA screen.
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*/
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void vga_clear(void);
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/**
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* Set the foreground and background color for subsequent writes.
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*
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* @param fg Foreground color.
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* @param bg Background color.
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*/
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void vga_set_color(vga_color_t fg, vga_color_t bg);
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/**
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* Write a single character at the current cursor position.
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*
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* @param c Character to write.
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*/
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void vga_putchar(char c);
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/**
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* Write a null-terminated string at the current cursor position.
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*
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* @param str String to write.
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*/
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void vga_puts(const char *str);
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/**
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* Write a 32-bit value in hexadecimal to the VGA display.
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*
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* @param val Value to display.
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*/
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void vga_put_hex(uint32_t val);
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/**
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* Write a 32-bit value in decimal to the VGA display.
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*
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* @param val Value to display.
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*/
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void vga_put_dec(uint32_t val);
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/**
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* Display boot memory statistics on VGA.
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*
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* Shows detected memory, kernel size, and free pages.
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*/
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void vga_show_mem_stats(void);
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#endif /* VGA_H */
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