prosofib/io.c at master · lipixx/prosofib · GitHub

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/*
 * io.c -
 */

#include <io.h>

/**************/
/** Screen  ***/
/**************/

#define NUM_COLUMNS 80
#define NUM_ROWS    25

Byte x, y = 15;

/* Read a byte from 'port' */
Byte
inb (unsigned short port)
{
  Byte v;

  __asm__ __volatile__ ("inb %w1,%0":"=a" (v):"Nd" (port));
  return v;
}

void
printc (char c)
{
  Word ch = (Word) (c & 0x00FF) | 0x0200;
  DWord screen = 0xb8000 + (y * NUM_COLUMNS + x) * 2;

  /*Implementem \n i \t */
  if (c == '\n')
    {
      x = 0;
      y++;
    }
  else
    {
      if (c == '\t')
	{
	  x += 8;
	  if (x >= NUM_COLUMNS)
	    {
	      x = 0;
	      if (++y >= NUM_ROWS)
		y = 0;
	    }
	}
      else
	{
	  if (++x >= NUM_COLUMNS)
	    {
	      x = 0;
	      if (++y >= NUM_ROWS)
		y = 0;
	    }
	asm ("movw %0, (%1)":
	:"g" (ch), "g" (screen));
	}
    }
  //Sortida per consola
  __asm__ __volatile__ ("movb %0, %%al\n" "outb $0xe9"::"g" (c));

}

void
printk (char *string)
{
  int i;
  for (i = 0; string[i]; i++)
    printc (string[i]);
}

/**Funcions d'escriptura per pantalla amb coordenades que hem creat*/
void
printk_xy (int x, int y, char *string)
{
  int i;
  for (i = 0; string[i]; i++)
    printc_xy (x + i, y, string[i]);
}

void
printc_xy (int x, int y, char c)
{
  Word ch = (Word) (c & 0x00FF) | 0x0200;
  DWord screen = 0xb8000 + (y * NUM_COLUMNS + x) * 2;
asm ("movw %0, (%1)":
:"g" (ch), "g" (screen));

}