usr.bin/doscmd/int2f.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 int2f.c,v 2.2 1996/04/08 19:32:53 bostic Exp
  31  *
  32  * $FreeBSD: src/usr.bin/doscmd/int2f.c,v 1.3.2.2 2002/04/25 11:04:51 tg Exp $
  33  * $DragonFly: src/usr.bin/doscmd/int2f.c,v 1.2 2003/06/17 04:29:26 dillon Exp $
  34  */
  35
  36 #include "doscmd.h"
  37 #include "dispatch.h"
  38 #include "tty.h"
  39
  40 /*
  41 ** Multiplex interrupt.
  42 **
  43 ** subfunctions 0-0x7f reserved for DOS, some are implemented here.
  44 **
  45 */
  46
  47 /*
  48 ** 2f:00 2f:01 2f:02 2f:03
  49 **
  50 ** Various PRINT.COM functions
  51 */
  52 static int
  53 int2f_printer(regcontext_t *REGS)
  54 {
  55     debug (D_FILE_OPS, "Called printer function 0x%02x", R_AH);
  56     R_AL = FUNC_NUM_IVALID;
  57     return(0);
  58 }
  59
  60 /*
  61 ** 2f:12
  62 **
  63 ** DOS internal functions.  Only one we support is 0x2e, and then only to
  64 ** complain about it.
  65 */
  66 static int
  67 int2f_dosinternal(regcontext_t *REGS)
  68 {
  69     switch (R_AL) {
  70     case 0x2e:          /* XXX - GET/SET ERROR TABLE ADDRESSES */
  71         switch (R_DL) {
  72         case 0x00:
  73         case 0x02:
  74         case 0x04:
  75         case 0x06:
  76             debug(D_ALWAYS,"DOS program attempted to get internal error table.\n");
  77             break;
  78
  79         case 0x01:
  80         case 0x03:
  81         case 0x05:
  82         case 0x07:
  83         case 0x09:
  84             debug(D_ALWAYS,"DOS program attempted to set error table.\n");
  85             break;
  86         }
  87
  88     default:
  89         unknown_int4(0x2f, 0x12, R_AL, R_DL, REGS);
  90         break;
  91     }
  92     R_AL = FUNC_NUM_IVALID;
  93     return(0);
  94 }
  95
  96 /*
  97 ** 2f:16
  98 **
  99 ** Windows Enhanced Mode functions.  Aigh!
 100 */
 101 static int
 102 int2f_windows(regcontext_t *REGS)
 103 {
 104     switch (R_AL) {
 105     case 0x00:
 106         R_AL = 0x00;                    /* Neither Win 3.x nor 2.x running */
 107         return(0);
 108
 109     case 0x80:                          /* installation check */
 110         tty_pause();
 111         R_AL = 0x00;
 112         return(0);
 113
 114     default:
 115         unknown_int3(0x2f, 0x16, R_AL, REGS);
 116         break;
 117     }
 118     R_AL = FUNC_NUM_IVALID;
 119     return(0);
 120 }
 121
 122 /*
 123 ** 2f:43
 124 **
 125 ** XMS interface
 126 */
 127 static int
 128 int2f_xms(regcontext_t *REGS)
 129 {
 130     switch(R_AL) {
 131     case 0:                     /* installation check */
 132         return(0);              /* %al = 0 */
 133     default:
 134         R_AL = FUNC_NUM_IVALID;
 135         return(0);
 136     }
 137 }
 138
 139
 140 static struct intfunc_table int2f_table[] = {
 141
 142     { 0x00,     IFT_NOSUBFUNC,  int2f_printer,          "printer"},
 143     { 0x01,     IFT_NOSUBFUNC,  int2f_printer,          "printer"},
 144     { 0x02,     IFT_NOSUBFUNC,  int2f_printer,          "printer"},
 145     { 0x03,     IFT_NOSUBFUNC,  int2f_printer,          "printer"},
 146     { 0x12,     IFT_NOSUBFUNC,  int2f_dosinternal,      "DOS internal function"},
 147     { 0x16,     IFT_NOSUBFUNC,  int2f_windows,          "Windows detect"},
 148     { 0x43,     IFT_NOSUBFUNC,  int2f_xms,              "XMS"},
 149     { -1,       0,              NULL,                   NULL}
 150 };
 151
 152 /*
 153 ** int2f (multiplex) handler.
 154 **
 155 ** Note that due to the widely varied and inconsistent conventions, handlers
 156 ** called from here are expected to manage their own return values.
 157 */
 158 void
 159 int2f(regcontext_t *REGS)
 160 {
 161     int         idx;
 162
 163     /* look up the handler for the current function */
 164     idx = intfunc_search(int2f_table, R_AH, R_AL);
 165
 166     if (idx >= 0) {             /* respond on multiplex chain */
 167         int2f_table[idx].handler(REGS);
 168     } else {
 169         unknown_int2(0x2f, R_AH, REGS);
 170     }
 171 }
 172
 173
 174