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                 AH_reg(context) = 0x0c;
  29                 SET_CFLAG(context);
  30                 break;
  31
  32         case 0x06:             /* FORMAT TRACK AND SET BAD SECTOR FLAGS */
  33         case 0x07:             /* FORMAT DRIVE STARTING AT GIVEN TRACK  */
  34                 AH_reg(context) = 0x0c;
  35                 break;
  36
  37         case 0x08:                              /* GET DRIVE PARAMETERS  */
  38                 AH_reg(context) = (DL_reg(context) & 0x80) ? 0x07 : 0x01;
  39                 SET_CFLAG(context);
  40                 break;
  41
  42         case 0x09:         /* INITIALIZE CONTROLLER WITH DRIVE PARAMETERS */
  43         case 0x0c:         /* SEEK TO CYLINDER                            */
  44         case 0x0d:         /* RESET HARD DISKS                            */
  45         case 0x10:         /* CHECK IF DRIVE READY                        */
  46         case 0x11:         /* RECALIBRATE DRIVE                           */
  47         case 0x14:         /* CONTROLLER INTERNAL DIAGNOSTIC              */
  48                 AH_reg(context) = 0;
  49                 break;
  50
  51         case 0x0e:                    /* READ SECTOR BUFFER (XT only)      */
  52         case 0x0f:                    /* WRITE SECTOR BUFFER (XT only)     */
  53         case 0x12:                    /* CONTROLLER RAM DIAGNOSTIC (XT,PS) */
  54         case 0x13:                    /* DRIVE DIAGNOSTIC (XT,PS)          */
  55                 AH_reg(context) = 0x01;
  56                 SET_CFLAG(context);
  57                 break;
  58
  59         default:
  60                 INT_BARF( context, 0x13 );
  61     }
  62 }