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#include "framebuffer.h"
#include "kernel.h"
#include "portio.h"
uint16_t framebuffer_color = 0x0700;
uint8_t framebuffer_x;
uint8_t framebuffer_y;
void framebuffer_init() {
union {uint8_t b[2]; uint16_t w;} pos;
outb(0x3d4, 0x0f);
inb(0x3d5, pos.b[0]);
outb(0x3d4, 0x0e);
inb(0x3d5, pos.b[1]);
framebuffer_x = pos.w % 80;
framebuffer_y = pos.w / 80;
}
void framebuffer_putchar(char c) {
switch(c) {
case '\f':
framebuffer_clear();
break;
case '\r':
framebuffer_x = 0;
break;
case '\n':
framebuffer_x = 80;
break;
default:
framebuffer[framebuffer_y][framebuffer_x++] = framebuffer_color | c;
}
if(framebuffer_x == 80) {
framebuffer_x = 0;
if(framebuffer_y < 24) {
framebuffer_y++;
} else {
framebuffer_scroll();
}
}
}
void framebuffer_clear() {
for(int y = 0; y < 25; y++) {
for(int x = 0; x < 80; x++) {
framebuffer[y][x] = framebuffer_color;
}
}
framebuffer_x = framebuffer_y = 0;
}
void framebuffer_scroll() {
for(int y = 0; y < 24; y++) {
for(int x = 0; x < 80; x++) {
framebuffer[y][x] = framebuffer[y + 1][x];
}
}
for(int x = 0; x < 80; x++) {
framebuffer[24][x] = framebuffer_color;
}
}
void framebuffer_move_cursor() {
uint16_t pos = framebuffer_y * 80 + framebuffer_x;
outb(0x3d4, 0x0f);
outb(0x3d5, pos & 0xff);
outb(0x3d4, 0x0e);
outb(0x3d5, pos >> 8);
}
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