os/drivers/i386/vga.c

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#include <grub/text_fb_info.h>
#include "../vga.h"
#define xy_to_mem(x,y) ((x+(y*height))*2)
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char* screen;
int width;
int height;
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vga_colors fg_color;
vga_colors bg_color;
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void vga_set_char(int x,int y,char c) {
screen[xy_to_mem(x,y)]=c;
screen[xy_to_mem(x,y)+1]=(bg_color<<4)|fg_color;
}
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void vga_init(text_fb_info framebuffer_info) {
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fg_color=VGA_WHITE;
bg_color=VGA_BLACK;
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screen=framebuffer_info.address;
width=framebuffer_info.width;
height=framebuffer_info.height;
vga_clear();
}
void vga_clear() {
for (int y=0;y<height;y++) {
for (int x=0;x<width;x++) {
vga_set_char(x,y,' ');
}
}
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}