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cowos attempted gdt, but at least we have vga drivers now

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cowmonk 2025-07-18 23:50:07 -07:00
parent b08b0728ae
commit 41b34d2a9d
14 changed files with 253 additions and 140 deletions
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63
kernel/include/drivers/video/vga.h
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@ -2,49 +2,30 @@
#define VGA_H
#include <stdint.h>
#include <stddef.h>
/* hardware text mode const */
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,
};
// VGA mem addr
#define VGA_TEXT_BUFFER 0xB8000 // Text mode video memory
#define VGA_GRAPHICS_BUFFER 0xA0000 // Graphics mode video memory
static inline uint8_t
vga_entry_color(enum vga_color fg, enum vga_color bg)
{
return fg | bg << 4;
}
// VGA mode 13h dimensions
#define VGA_WIDTH 320
#define VGA_HEIGHT 200
static inline uint16_t
vga_entry(unsigned char uc, uint8_t color)
{
return (uint16_t) uc | (uint16_t) color << 8;
}
// VGA register IO ports
#define VGA_AC_INDEX 0x3C0 // attribute controller index
#define VGA_AC_WRITE 0x3C0 // attribute controller write
#define VGA_AC_READ 0x3C1 // attribute controller read
#define VGA_MISC_WRITE 0x3C2 // miscellaneous output register
#define VGA_SEQ_INDEX 0x3C4 // sequencer index
#define VGA_SEQ_DATA 0x3C5 // sequencer data
#define VGA_GC_INDEX 0x3CE // graphics controller index
#define VGA_GC_DATA 0x3CF // graphics controller data
#define VGA_CRTC_INDEX 0x3D4 // CRT controller index
#define VGA_CRTC_DATA 0x3D5 // CRT controller data
#define VGA_INSTAT_READ 0x3DA // input status read
/* using mode 3 of VGA 80x25 */
#define VGA_WIDTH 80
#define VGA_HEIGHT 25
#define VGA_MEMORY 0xA0000 /* VGA memory location */
void vga_set_mode_13h(void);
void vga_put_pixel(uint16_t x, uint16_t y, uint8_t color);
void vga_clear_screen(uint8_t color);
void term_init(void);
void term_setcolor(uint8_t color);
void term_putentryat(char c, uint8_t color, size_t x, size_t y);
void term_putchar(char c);
void term_writestr(const char* data);
#endif // VGA_H
#endif