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/*
* Copyright (c) 1992, 1993, 1996
* Berkeley Software Design, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Berkeley Software
* Design, Inc.
*
* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* BSDI int16.c,v 2.2 1996/04/08 19:32:47 bostic Exp
*
* $FreeBSD$
*/
#include "doscmd.h"
#define K_NEXT *(u_short *)0x41a
#define K_FREE *(u_short *)0x41c
#define KbdEmpty() (K_NEXT == K_FREE)
#define HWM 16
volatile int poll_cnt = 0;
void
wakeup_poll(void)
{
if (poll_cnt <= 0)
poll_cnt = HWM;
}
void
reset_poll(void)
{
poll_cnt = HWM;
}
void
sleep_poll(void)
{
#if 0
printf("sleep_poll: poll_cnt=%d\n", poll_cnt);
if (poll_cnt == 14)
tmode = 1;
#endif
if (--poll_cnt <= 0) {
poll_cnt = 0;
while (KbdEmpty() && poll_cnt <= 0) {
#if 0
softint(0x28);
#endif
if (KbdEmpty() && poll_cnt <= 0)
tty_pause();
}
}
}
void
int16(regcontext_t *REGS)
{
int c;
if (!xmode && !raw_kbd) {
if (vflag) dump_regs(REGS);
fatal ("int16 func 0x%x only supported in X mode\n", R_AH);
}
switch(R_AH) {
case 0x00:
case 0x10: /* Get enhanced keystroke */
poll_cnt = 16;
while (KbdEmpty())
tty_pause();
R_AX = KbdRead();
break;
case 0x01: /* Get keystroke */
case 0x11: /* Get enhanced keystroke */
if (!raw_kbd)
sleep_poll();
if (KbdEmpty()) {
R_FLAGS |= PSL_Z;
break;
}
R_FLAGS &= ~PSL_Z;
R_AX = KbdPeek();
break;
case 0x02:
R_AL = tty_state();
break;
case 0x12:
R_AH = tty_estate();
R_AL = tty_state();
break;
case 0x03: /* Set typematic and delay rate */
break;
case 0x05:
KbdWrite(R_CX);
break;
case 0x55:
R_AX = 0x43af; /* Empirical value ... */
break;
case 0x92:
R_AH = 0x00;
break;
case 0xa2:
debug(D_HALF, "122-key keyboard support check\n");
break;
default:
unknown_int2(0x16, R_AH, REGS);
break;
}
}
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