freebsd/sys/i386/boot/io.c

/*
 * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
 *
 * Mach Operating System
 * Copyright (c) 1992, 1991 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

/*
 * HISTORY
 * $Log: io.c,v $
 * Revision 1.3  1993/07/11  12:02:24  andrew
 * Fixes from bde, including support for loading @ any MB boundary (e.g. a
 * kernel linked for 0xfe100000 will load at the 1MB mark) and read-ahead
 * buffering to speed booting from floppies.  Also works with aha174x
 * controllers in enhanced mode.
 *
 * Revision 1.2  1993/06/18  02:28:59  cgd
 * make it *do* something when loading the kernel, a la sun twiddling-thing
 *
 * Revision 1.1  1993/03/21  18:08:38  cgd
 * after 0.2.2 "stable" patches applied
 *
 * Revision 2.2  92/04/04  11:35:57  rpd
 * 	Fixed for IBM L40's A20 initialization.
 * 	[92/03/30            rvb]
 * 
 * 	Created.
 * 	[92/03/30            mg32]
 * 
 */

#include <i386/include/pio.h>

#define K_RDWR 		0x60		/* keyboard data & cmds (read/write) */
#define K_STATUS 	0x64		/* keyboard status */
#define K_CMD	 	0x64		/* keybd ctlr command (write-only) */

#define K_OBUF_FUL 	0x01		/* output buffer full */
#define K_IBUF_FUL 	0x02		/* input buffer full */

#define KC_CMD_WIN	0xd0		/* read  output port */
#define KC_CMD_WOUT	0xd1		/* write output port */
#define KB_A20		0x9f		/* enable A20,
					   enable output buffer full interrupt
					   enable data line
					   disable clock line */

/*
 * Gate A20 for high memory
 */
unsigned char	x_20 = KB_A20;
gateA20()
{
#ifdef	IBM_L40
	outb(0x92, 0x2);
#else	IBM_L40
	while (inb(K_STATUS) & K_IBUF_FUL);
	while (inb(K_STATUS) & K_OBUF_FUL)
		(void)inb(K_RDWR);

	outb(K_CMD, KC_CMD_WOUT);
	while (inb(K_STATUS) & K_IBUF_FUL);
	outb(K_RDWR, x_20);
	while (inb(K_STATUS) & K_IBUF_FUL);
#endif	IBM_L40
}

/* printf - only handles %d as decimal, %c as char, %s as string */

printf(format,data)
     char *format;
     int data;
{
	int *dataptr = &data;
	char c;

	reset_twiddle();
	while (c = *format++)
		if (c != '%')
			putchar(c);
		else
			switch (c = *format++) {
			      case 'd': {
				      int num = *dataptr++;
				      char buf[10], *ptr = buf;
				      if (num<0) {
					      num = -num;
					      putchar('-');
				      }
				      do
					      *ptr++ = '0'+num%10;
				      while (num /= 10);
				      do
					      putchar(*--ptr);
				      while (ptr != buf);
				      break;
			      }
			      case 'x': {
				      int num = *dataptr++, dig;
				      char buf[8], *ptr = buf;
				      do
					      *ptr++ = (dig=(num&0xf)) > 9?
							'a' + dig - 10 :
							'0' + dig;
				      while (num >>= 4);
				      do
					      putchar(*--ptr);
				      while (ptr != buf);
				      break;
			      }
			      case 'c': putchar((*dataptr++)&0xff); break;
			      case 's': {
				      char *ptr = (char *)*dataptr++;
				      while (c = *ptr++)
					      putchar(c);
				      break;
			      }
			}
}

putchar(c)
{
	if (c == '\n')
		putc('\r');
	putc(c);
}

getchar()
{
	int c;

	if ((c=getc()) == '\r')
		c = '\n';
	if (c == '\b') {
		putchar('\b');
		putchar(' ');
	}
	putchar(c);
	return(c);
}

gets(buf)
char *buf;
{
	int	i;
	char *ptr=buf;

	for (i = 240000; i>0; i--)
		if (ischar())
			for (;;)
				switch(*ptr = getchar() & 0xff) {
				      case '\n':
				      case '\r':
					*ptr = '\0';
					return 1;
				      case '\b':
					if (ptr > buf) ptr--;
					continue;
				      default:
					ptr++;
				}
	return 0;
}

strcmp(s1, s2)
char *s1, *s2;
{
	while (*s1 == *s2) {
		if (!*s1++)
			return 0;
		s2++;
	}
	return 1;
}

bcopy(from, to, len)
char *from, *to;
int len;
{
	while (len-- > 0)
		*to++ = *from++;
}

static int tw_on;
static int tw_pos;
static char tw_chars[] = "|/-\\";

reset_twiddle()
{
	if (tw_on)
		putchar('\b');
	tw_on = 0;
	tw_pos = 0;
}

twiddle()
{
	if (tw_on)
		putchar('\b');
	else
		tw_on = 1;
	putchar(tw_chars[tw_pos++]);
	tw_pos %= (sizeof(tw_chars) - 1);
}