86 lines
1.3 KiB
C
86 lines
1.3 KiB
C
#include "io.h"
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#include "stdio.h"
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#include "string.h"
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char* fb = (char *) 0x000B8000;
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const unsigned VGA_WIDTH = 80;
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const unsigned VGA_HEIGHT = 25;
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const unsigned int COLOR = 0x7;
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unsigned int VGA_X = 0, VGA_Y = 0;
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void move_cursor(int x, int y)
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{
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unsigned short pos = y*VGA_WIDTH+x;
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outb(FB_CMD_PORT, FB_HIGH_BYTE_CMD);
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outb(FB_DATA_PORT, ((pos >> 8) & 0x00FF));
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outb(FB_CMD_PORT, FB_LOW_BYTE_CMD);
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outb(FB_DATA_PORT, pos & 0x00FF);
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}
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void putchar(int x, int y, char c)
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{
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fb[2*(y*VGA_WIDTH+x)] = c;
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}
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void putcolor(int x, int y, int color)
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{
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fb[2*(y*VGA_WIDTH+x)+1] = color;
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}
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void clear(void)
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{
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for (unsigned int y=0; y<VGA_HEIGHT; y++)
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{
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for (unsigned int x=0; x<VGA_WIDTH; x++)
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{
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putchar(x, y, '\0');
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putcolor(x, y, COLOR);
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}
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}
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VGA_X = 0;
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VGA_Y = 0;
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move_cursor(VGA_X, VGA_Y);
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}
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void putc(char c)
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{
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switch(c)
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{
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case '\n':
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VGA_X = 0;
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VGA_Y++;
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break;
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case '\r':
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VGA_X = 0;
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break;
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default:
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putchar(VGA_X, VGA_Y, c);
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VGA_X++;
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break;
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}
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if (VGA_X >= VGA_WIDTH)
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{
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VGA_Y++;
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VGA_X = 0;
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}
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//if (VGA_Y >= VGA_HEIGHT) scroll
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move_cursor(VGA_X, VGA_Y);
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}
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void puts(const char* str)
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{
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while (*str)
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{
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putc(*str);
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str++;
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}
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}
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