msdos/int13.c

   1 /*
   2  * BIOS interrupt 13h handler
   3  */
   4
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <sys/ioctl.h>
  10 #include <fcntl.h>
  11 #ifdef linux
  12 #include <linux/fd.h>
  13 #endif
  14 #include "miscemu.h"
  15 /* #define DEBUG_INT */
  16 #include "debug.h"
  17 #include "drive.h"
  18
  19 /**********************************************************************
  20  *          INT_Int13Handler
  21  *
  22  * Handler for int 13h (disk I/O).
  23  */
  24 void WINAPI INT_Int13Handler( CONTEXT *context )
  25 {
  26     switch(AH_reg(context))
  27     {
  28         case 0x00:                            /* RESET DISK SYSTEM     */
  29                 break; /* no return ? */
  30         case 0x01:                            /* STATUS OF DISK SYSTEM */
  31                 AL_reg(context) = 0; /* successful completion */
  32                 break;
  33         case 0x02:                            /* READ SECTORS INTO MEMORY */
  34                 AL_reg(context) = 0; /* number of sectors read */
  35                 AH_reg(context) = 0; /* status */
  36                 break;
  37         case 0x03:                            /* WRITE SECTORS FROM MEMORY */
  38                 break; /* no return ? */
  39         case 0x04:                            /* VERIFY DISK SECTOR(S) */
  40                 AL_reg(context) = 0; /* number of sectors verified */
  41                 AH_reg(context) = 0;
  42                 break;
  43
  44         case 0x05:                                     /* FORMAT TRACK */
  45         case 0x06:             /* FORMAT TRACK AND SET BAD SECTOR FLAGS */
  46         case 0x07:             /* FORMAT DRIVE STARTING AT GIVEN TRACK  */
  47             /* despite what Ralf Brown says, 0x06 and 0x07 seem to
  48              * set CFLAG, too (at least my BIOS does that) */
  49             AH_reg(context) = 0x0c;
  50             SET_CFLAG(context);
  51             break;
  52
  53         case 0x08:                              /* GET DRIVE PARAMETERS  */
  54                 if (DL_reg(context) & 0x80) { /* hard disk ? */
  55                         AH_reg(context) = 0x07;
  56                         SET_CFLAG(context);
  57                 }
  58                 else { /* floppy disk */
  59 #ifdef linux
  60                         unsigned int i, nr_of_drives = 0;
  61                         BYTE drive_nr = DL_reg(context);
  62                         int floppy_fd;
  63                         struct floppy_drive_params floppy_parm;
  64
  65                         AH_reg(context) = 0x00; /* success */
  66
  67                         for (i = 0; i < MAX_DOS_DRIVES; i++)
  68                         if (DRIVE_GetType(i) == TYPE_FLOPPY) nr_of_drives++;
  69                         DL_reg(context) = nr_of_drives;
  70
  71                         if (drive_nr > 1) { /* invalid drive ? */
  72                                 BX_reg(context) = 0;
  73                                 CX_reg(context) = 0;
  74                                 DH_reg(context) = 0;
  75                                 break;
  76                         }
  77
  78                         if ( (floppy_fd = DRIVE_OpenDevice( drive_nr, O_NONBLOCK)) == -1)
  79                         {
  80                                 WARN(int, "(GET DRIVE PARAMETERS): Can't determine floppy geometry !\n");
  81                                 BX_reg(context) = 0;
  82                                 CX_reg(context) = 0;
  83                                 DH_reg(context) = 0;
  84                                 break;
  85                         }
  86                         ioctl(floppy_fd, FDGETDRVPRM, &floppy_parm);
  87                         close(floppy_fd);
  88
  89                         BL_reg(context) = floppy_parm.cmos;
  90
  91                         /* CH = low eight bits of max cyl
  92                            CL = max sec nr (bits 5-0),
  93                            hi two bits of max cyl (bits 7-6)
  94                            DH = max head nr */
  95                         DH_reg(context) = 0x01;
  96                         switch (BL_reg(context))
  97                         {
  98                             case 0: /* no drive */
  99                                 CX_reg(context) = 0x0;
 100                                 DX_reg(context) = 0x0;
 101                                 break;
 102                             case 1: /* 360 K */
 103                                 CX_reg(context) = 0x2709;
 104                                 break;
 105                             case 2: /* 1.2 M */
 106                                 CX_reg(context) = 0x4f0f;
 107                                 break;
 108                             case 3: /* 720 K */
 109                                 CX_reg(context) = 0x4f09;
 110                                 break;
 111                             case 4: /* 1.44 M */
 112                                 CX_reg(context) = 0x4f12;
 113                                 break;
 114                             case 5:
 115                             case 6: /* 2.88 M */
 116                                 CX_reg(context) = 0x4f24;
 117                                 break;
 118                         }
 119                         ES_reg(context) = 0x0000; /* FIXME: drive parameter table */
 120                         DI_reg(context) = 0x0000;
 121 #else
 122                         AH_reg(context) = 0x01;
 123                         SET_CFLAG(context);
 124                         break;
 125 #endif
 126                 }
 127                 break;
 128
 129         case 0x09:         /* INITIALIZE CONTROLLER WITH DRIVE PARAMETERS */
 130         case 0x0a:         /* FIXED DISK - READ LONG (XT,AT,XT286,PS)     */
 131         case 0x0b:         /* FIXED DISK - WRITE LONG (XT,AT,XT286,PS)    */
 132         case 0x0c:         /* SEEK TO CYLINDER                            */
 133         case 0x0d:         /* ALTERNATE RESET HARD DISKS                  */
 134         case 0x10:         /* CHECK IF DRIVE READY                        */
 135         case 0x11:         /* RECALIBRATE DRIVE                           */
 136         case 0x14:         /* CONTROLLER INTERNAL DIAGNOSTIC              */
 137                 AH_reg(context) = 0;
 138                 break;
 139
 140         case 0x15:         /* GET DISK TYPE (AT,XT2,XT286,CONV,PS) */
 141                 if (DL_reg(context) & 0x80) { /* hard disk ? */
 142                         AH_reg(context) = 3; /* fixed disk */
 143                         SET_CFLAG(context);
 144                 }
 145                 else { /* floppy disk ? */
 146                         AH_reg(context) = 2; /* floppy with change detection */
 147                         SET_CFLAG(context);
 148                 }
 149                 break;
 150         case 0x0e:                    /* READ SECTOR BUFFER (XT only)      */
 151         case 0x0f:                    /* WRITE SECTOR BUFFER (XT only)     */
 152         case 0x12:                    /* CONTROLLER RAM DIAGNOSTIC (XT,PS) */
 153         case 0x13:                    /* DRIVE DIAGNOSTIC (XT,PS)          */
 154                 AH_reg(context) = 0x01;
 155                 SET_CFLAG(context);
 156                 break;
 157
 158         case 0x16:         /* FLOPPY - CHANGE OF DISK STATUS */
 159                 AH_reg(context) = 0; /* FIXME - no change */
 160                 break;
 161         case 0x17:         /* SET DISK TYPE FOR FORMAT */
 162                 if (DL_reg(context) < 4)
 163                     AH_reg(context) = 0x00; /* successful completion */
 164                 else
 165                     AH_reg(context) = 0x01; /* error */
 166                 break;
 167         case 0x18:         /* SET MEDIA TYPE FOR FORMAT */
 168                 if (DL_reg(context) < 4)
 169                     AH_reg(context) = 0x00; /* successful completion */
 170                 else
 171                     AH_reg(context) = 0x01; /* error */
 172                 break;
 173         case 0x19:         /* FIXED DISK - PARK HEADS */
 174         default:
 175                 INT_BARF( context, 0x13 );
 176     }
 177 }