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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

22
kernel/include/fb.h
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@ -1,22 +0,0 @@
#ifndef FB_H
#define FB_H
/* *pixel = vram + y*pitch + x*pixelwidth */
/*
| width | how many pixels you have on a horizontal line |
|===========================================================================|
| height | how many horizontal lines of pixels are present |
|===========================================================================|
| pitch | how many bytes of VRAM you should skip to go one pixel down |
|===========================================================================|
| depth | how many bits of color you have |
|===========================================================================|
| pixelwidth | how many bytes of VRAM you should skip to go one pixel right |
*/
#include <klibc/types.h>
void putpixel(int pos_x, int pos_y, unsigned char VGA_COLOR);
#endif /* FB_H */

28
kernel/include/gdt.h Normal file
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@ -0,0 +1,28 @@
#include <stdint.h>
#ifndef GDT_H
#define GDT_H
typedef struct GDTEntry {
uint16_t limit;
uint16_t base_low;
uint16_t base_mid;
uint8_t base_high;
uint8_t access;
uint8_t granularity;
} __attribute__((packed)) GDTEntry;
typedef struct GDTPtr {
uint16_t limit;
uint64_t base;
} __attribute__((packed)) GDTPtr;
#define GDT_NUM_ENTRIES 5 /* including null descriptor */
#define GDT_KERNEL_CODE 0x08
#define GDT_KERNEL_DATA 0x10
#define GDT_USER_CODE 0x18
#define GDT_USER_DATA 0x20
void initGDT();
#endif /* GDT_H */