msdos/int13.c

   1 /*
   2  * BIOS interrupt 13h handler
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include "miscemu.h"
   8 #include "stddebug.h"
   9 /* #define DEBUG_INT */
  10 #include "debug.h"
  11
  12
  13 /**********************************************************************
  14  *          INT_Int13Handler
  15  *
  16  * Handler for int 13h (disk I/O).
  17  */
  18 void WINAPI INT_Int13Handler( CONTEXT *context )
  19 {
  20     switch(AH_reg(context))
  21     {
  22         case 0x00:                            /* RESET DISK SYSTEM     */
  23         case 0x04:                            /* VERIFY DISK SECTOR(S) */
  24                 AH_reg(context) = 0;
  25                 break;
  26
  27         case 0x05:                                     /* FORMAT TRACK */
  28         case 0x06:             /* FORMAT TRACK AND SET BAD SECTOR FLAGS */
  29         case 0x07:             /* FORMAT DRIVE STARTING AT GIVEN TRACK  */
  30        /* despite of what Ralf Brown says, 0x06 and 0x07 seem to set CFLAG, too (at least my BIOS does that) */
  31                 AH_reg(context) = 0x0c;
  32                 SET_CFLAG(context);
  33                 break;
  34
  35         case 0x08:                              /* GET DRIVE PARAMETERS  */
  36                 AH_reg(context) = (DL_reg(context) & 0x80) ? 0x07 : 0x01;
  37                 SET_CFLAG(context);
  38                 break;
  39
  40         case 0x09:         /* INITIALIZE CONTROLLER WITH DRIVE PARAMETERS */
  41         case 0x0c:         /* SEEK TO CYLINDER                            */
  42         case 0x0d:         /* RESET HARD DISKS                            */
  43         case 0x10:         /* CHECK IF DRIVE READY                        */
  44         case 0x11:         /* RECALIBRATE DRIVE                           */
  45         case 0x14:         /* CONTROLLER INTERNAL DIAGNOSTIC              */
  46                 AH_reg(context) = 0;
  47                 break;
  48
  49         case 0x0e:                    /* READ SECTOR BUFFER (XT only)      */
  50         case 0x0f:                    /* WRITE SECTOR BUFFER (XT only)     */
  51         case 0x12:                    /* CONTROLLER RAM DIAGNOSTIC (XT,PS) */
  52         case 0x13:                    /* DRIVE DIAGNOSTIC (XT,PS)          */
  53                 AH_reg(context) = 0x01;
  54                 SET_CFLAG(context);
  55                 break;
  56
  57         default:
  58                 INT_BARF( context, 0x13 );
  59     }
  60 }