NetBSD/sys/arch/i386/boot/io.c

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/* $NetBSD: io.c,v 1.19 1996/06/18 07:47:04 mycroft Exp $ */
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/*
* 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.
*/
#include <sys/types.h>
#include <machine/pio.h>
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void gateA20 __P((int on));
/*void printf __P((const char *format, int data));*/ /* not quite right XXX */
void putchar __P((int c));
void gets __P((char *buf));
int strcmp __P((const char *s1, const char *s2));
void bcopy __P((char *from, char *to, int len));
int awaitkey __P((int seconds));
void twiddle __P((void));
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#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 0xdf /* enable A20,
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enable output buffer full interrupt
enable data line
enable clock line */
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/*
* Gate A20 for high memory
*/
void
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gateA20(on)
int on;
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{
#ifdef IBM_L40
outb(0x92, 0x2);
#else IBM_L40
while (inb(K_STATUS) & K_IBUF_FUL);
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while (inb(K_STATUS) & K_OBUF_FUL)
(void)inb(K_RDWR);
outb(K_CMD, KC_CMD_WOUT);
while (inb(K_STATUS) & K_IBUF_FUL);
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if (on)
outb(K_RDWR, 0xdf);
else
outb(K_RDWR, 0xcd);
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while (inb(K_STATUS) & K_IBUF_FUL);
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while (inb(K_STATUS) & K_OBUF_FUL)
(void)inb(K_RDWR);
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#endif IBM_L40
}
/* printf - only handles %d as decimal, %c as char, %s as string */
void
printf(format, data)
const char *format;
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int data;
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{
int *dataptr = &data;
char c;
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while (c = *format++) {
if (c != '%') {
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putchar(c);
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continue;
}
c = *format++;
if (c == 'd') {
int num = *dataptr++, dig;
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char buf[10], *ptr = buf;
if (num < 0) {
num = -num;
putchar('-');
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}
do {
dig = num % 10;
*ptr++ = '0' + dig;
} while (num /= 10);
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do
putchar(*--ptr);
while (ptr != buf);
} else if (c == 'x') {
unsigned int num = (unsigned int)*dataptr++, dig;
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char buf[8], *ptr = buf;
do {
dig = num & 0xf;
*ptr++ = dig > 9 ?
'a' + dig - 10 :
'0' + dig;
} while (num >>= 4);
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do
putchar(*--ptr);
while (ptr != buf);
} else if (c == 'c') {
putchar((char)*dataptr++);
} else if (c == 's') {
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char *ptr = (char *)*dataptr++;
while (c = *ptr++)
putchar(c);
}
}
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}
void
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putchar(c)
int c;
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{
if (c == '\n')
putc('\r');
putc(c);
}
void
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gets(buf)
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char *buf;
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{
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char *ptr = buf;
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for (;;) {
register int c = getc();
if (c == '\n' || c == '\r') {
putchar('\n');
*ptr = '\0';
return;
} else if (c == '\b' || c == '\177') {
if (ptr > buf) {
putchar('\b');
putchar(' ');
putchar('\b');
ptr--;
}
} else {
putchar(c);
*ptr++ = c;
}
}
/* shouldn't ever be reached; we have to return in the loop. */
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}
int
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strcmp(s1, s2)
const char *s1, *s2;
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{
while (*s1 == *s2) {
if (!*s1++)
return 0;
s2++;
}
return 1;
}
void
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bcopy(from, to, len)
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char *from, *to;
int len;
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{
if (from > to)
while (--len >= 0)
*to++ = *from++;
else {
to += len;
from += len;
while (--len >= 0)
*--to = *--from;
}
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}
/* Number of milliseconds to sleep during each microsleep */
#define NAPTIME 50
/*
* awaitkey takes a number of seconds to wait for a key to be
* struck. If a key is struck during the period, it returns true, else
* it returns false. It returns (nearly) as soon as the key is
* hit. Note that it does something only slightly smarter than busy waiting.
*/
int
awaitkey(seconds)
int seconds;
{
int i;
/*
* We sleep for brief periods (typically 50 milliseconds, set
* by NAPTIME), polling the input buffer at the end of
* each period.
*/
for (i = ((seconds*1000)/NAPTIME); i > 0; i--) {
/* multiply by 1000 to get microseconds. */
usleep(NAPTIME*1000);
if (ischar())
break;
}
/* If a character was hit, "i" will still be non-zero. */
return (i != 0);
}
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void
twiddle()
{
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static int pos;
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putchar("|/-\\"[pos++ & 3]);
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putchar('\b');
}