usr.bin/doscmd/int16.c

   1 /*
   2  * Copyright (c) 1992, 1993, 1996
   3  *      Berkeley Software Design, Inc.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Berkeley Software
  16  *      Design, Inc.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      BSDI int16.c,v 2.2 1996/04/08 19:32:47 bostic Exp
  31  *
  32  * $FreeBSD: src/usr.bin/doscmd/int16.c,v 1.2.2.2 2002/04/25 11:04:51 tg Exp $
  33  * $DragonFly: src/usr.bin/doscmd/int16.c,v 1.2 2003/06/17 04:29:26 dillon Exp $
  34  */
  35
  36 #include "doscmd.h"
  37 #include "tty.h"
  38
  39 #define K_NEXT          *(u_short *)0x41a
  40 #define K_FREE          *(u_short *)0x41c
  41
  42 #define HWM     16
  43 volatile int    poll_cnt = 0;
  44
  45 void
  46 wakeup_poll(void)
  47 {
  48     if (poll_cnt <= 0)
  49         poll_cnt = HWM;
  50 }
  51
  52 void
  53 reset_poll(void)
  54 {
  55     poll_cnt = HWM;
  56 }
  57
  58 void
  59 sleep_poll(void)
  60 {
  61 #if 0
  62     printf("sleep_poll: poll_cnt=%d\n", poll_cnt);
  63     if (poll_cnt == 14)
  64         tmode = 1;
  65 #endif
  66     if (--poll_cnt <= 0) {
  67         poll_cnt = 0;
  68         while (KbdEmpty() && poll_cnt <= 0) {
  69 #if 0
  70             softint(0x28);
  71 #endif
  72             if (KbdEmpty() && poll_cnt <= 0)
  73                 tty_pause();
  74         }
  75     }
  76 }
  77
  78 void
  79 int16(regcontext_t *REGS)
  80 {
  81     if (!xmode && !raw_kbd) {
  82         if (vflag) dump_regs(REGS);
  83         fatal ("int16 func 0x%x only supported in X mode\n", R_AH);
  84     }
  85     switch(R_AH) {
  86     case 0x00:
  87     case 0x10: /* Get enhanced keystroke */
  88         poll_cnt = 16;
  89         while (KbdEmpty())
  90             tty_pause();
  91         R_AX = KbdRead();
  92         break;
  93
  94     case 0x01: /* Get keystroke */
  95     case 0x11: /* Get enhanced keystroke */
  96         if (KbdEmpty()) {
  97             R_FLAGS |= PSL_Z;
  98             break;
  99         }
 100         R_FLAGS &= ~PSL_Z;
 101         R_AX = KbdPeek();
 102         break;
 103
 104     case 0x02:
 105         R_AL = tty_state();
 106         break;
 107
 108     case 0x12:
 109         R_AH = tty_estate();
 110         R_AL = tty_state();
 111         break;
 112
 113     case 0x03:          /* Set typematic and delay rate */
 114         break;
 115
 116     case 0x05:
 117         KbdWrite(R_CX);
 118         break;
 119
 120     case 0x55:
 121         R_AX = 0x43af;  /* Empirical value ... */
 122         break;
 123
 124     case 0x92:
 125         R_AH = 0x00;
 126         break;
 127
 128     case 0xa2:
 129         debug(D_HALF, "122-key keyboard support check\n");
 130         break;
 131
 132     default:
 133         unknown_int2(0x16, R_AH, REGS);
 134         break;
 135     }
 136 }