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/*-
* Copyright (c) 1998 Robert Nordier
* All rights reserved.
*
* Redistribution and use in source and binary forms are freely
* permitted provided that the above copyright notice and this
* paragraph and the following disclaimer are duplicated in all
* such forms.
*
* This software is provided "AS IS" and without any express or
* implied warranties, including, without limitation, the implied
* warranties of merchantability and fitness for a particular
* purpose.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <machine/psl.h>
#include <btxv86.h>
#include "lib.h"
#include "rbx.h"
#include "util.h"
#include "cons.h"
#define SECOND 18 /* Circa that many ticks in a second. */
uint8_t ioctrl = IO_KEYBOARD;
void
putc(int c)
{
v86.ctl = V86_FLAGS;
v86.addr = 0x10;
v86.eax = 0xe00 | (c & 0xff);
v86.ebx = 0x7;
v86int();
}
void
xputc(int c)
{
if (ioctrl & IO_KEYBOARD)
putc(c);
if (ioctrl & IO_SERIAL)
sio_putc(c);
}
void
putchar(int c)
{
if (c == '\n')
xputc('\r');
xputc(c);
}
int
getc(int fn)
{
/*
* The extra comparison against zero is an attempt to work around
* what appears to be a bug in QEMU and Bochs. Both emulators
* sometimes report a key-press with scancode one and ascii zero
* when no such key is pressed in reality. As far as I can tell,
* this only happens shortly after a reboot.
*/
v86.ctl = V86_FLAGS;
v86.addr = 0x16;
v86.eax = fn << 8;
v86int();
return fn == 0 ? v86.eax & 0xff : (!V86_ZR(v86.efl) && (v86.eax & 0xff));
}
int
xgetc(int fn)
{
if (OPT_CHECK(RBX_NOINTR))
return (0);
for (;;) {
if (ioctrl & IO_KEYBOARD && getc(1))
return (fn ? 1 : getc(0));
if (ioctrl & IO_SERIAL && sio_ischar())
return (fn ? 1 : sio_getc());
if (fn)
return (0);
}
/* NOTREACHED */
}
int
getchar(void)
{
return (xgetc(0));
}
int
keyhit(unsigned int secs)
{
uint32_t t0, t1;
if (OPT_CHECK(RBX_NOINTR))
return (0);
secs *= SECOND;
t0 = 0;
for (;;) {
if (xgetc(1))
return (1);
if (secs > 0) {
t1 = *(uint32_t *)PTOV(0x46c);
if (!t0)
t0 = t1;
if (t1 < t0 || t1 >= t0 + secs)
return (0);
}
}
/* NOTREACHED */
}
void
getstr(char *cmdstr, size_t cmdstrsize)
{
char *s;
int c;
s = cmdstr;
for (;;) {
switch (c = xgetc(0)) {
case 0:
break;
case '\177':
case '\b':
if (s > cmdstr) {
s--;
printf("\b \b");
}
break;
case '\n':
case '\r':
*s = 0;
return;
default:
if (s - cmdstr < cmdstrsize - 1)
*s++ = c;
putchar(c);
break;
}
}
}
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