miscemu/int13.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "miscemu.h"
   4 #include "stddebug.h"
   5 /* #define DEBUG_INT */
   6 #include "debug.h"
   7
   8
   9 /**********************************************************************
  10  *          INT_Int13Handler
  11  *
  12  * Handler for int 13h (disk I/O).
  13  */
  14 void INT_Int13Handler( SIGCONTEXT *context )
  15 {
  16     switch(AH_reg(context))
  17     {
  18         case 0x00:                            /* RESET DISK SYSTEM     */
  19         case 0x04:                            /* VERIFY DISK SECTOR(S) */
  20                 AH_reg(context) = 0;
  21                 break;
  22
  23         case 0x05:                                     /* FORMAT TRACK */
  24                 AH_reg(context) = 0x0c;
  25                 SET_CFLAG(context);
  26                 break;
  27
  28         case 0x06:             /* FORMAT TRACK AND SET BAD SECTOR FLAGS */
  29         case 0x07:             /* FORMAT DRIVE STARTING AT GIVEN TRACK  */
  30                 AH_reg(context) = 0x0c;
  31                 break;
  32
  33         case 0x08:                              /* GET DRIVE PARAMETERS  */
  34                 AH_reg(context) = (DL_reg(context) & 0x80) ? 0x07 : 0x01;
  35                 SET_CFLAG(context);
  36                 break;
  37
  38         case 0x09:         /* INITIALIZE CONTROLLER WITH DRIVE PARAMETERS */
  39         case 0x0c:         /* SEEK TO CYLINDER                            */
  40         case 0x0d:         /* RESET HARD DISKS                            */
  41         case 0x10:         /* CHECK IF DRIVE READY                        */
  42         case 0x11:         /* RECALIBRATE DRIVE                           */
  43         case 0x14:         /* CONTROLLER INTERNAL DIAGNOSTIC              */
  44                 AH_reg(context) = 0;
  45                 break;
  46
  47         case 0x0e:                    /* READ SECTOR BUFFER (XT only)      */
  48         case 0x0f:                    /* WRITE SECTOR BUFFER (XT only)     */
  49         case 0x12:                    /* CONTROLLER RAM DIAGNOSTIC (XT,PS) */
  50         case 0x13:                    /* DRIVE DIAGNOSTIC (XT,PS)          */
  51                 AH_reg(context) = 0x01;
  52                 SET_CFLAG(context);
  53                 break;
  54
  55         default:
  56                 INT_BARF( context, 0x13 );
  57     }
  58 }