Sweden-Number/msdos/int13.c

180 lines
5.6 KiB
C

/*
* BIOS interrupt 13h handler
*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#ifdef linux
# include <linux/fd.h>
#endif
#include "miscemu.h"
/* #define DEBUG_INT */
#include "debugtools.h"
#include "drive.h"
DEFAULT_DEBUG_CHANNEL(int);
/**********************************************************************
* INT_Int13Handler
*
* Handler for int 13h (disk I/O).
*/
void WINAPI INT_Int13Handler( CONTEXT86 *context )
{
switch(AH_reg(context))
{
case 0x00: /* RESET DISK SYSTEM */
break; /* no return ? */
case 0x01: /* STATUS OF DISK SYSTEM */
AL_reg(context) = 0; /* successful completion */
break;
case 0x02: /* READ SECTORS INTO MEMORY */
AL_reg(context) = 0; /* number of sectors read */
AH_reg(context) = 0; /* status */
break;
case 0x03: /* WRITE SECTORS FROM MEMORY */
break; /* no return ? */
case 0x04: /* VERIFY DISK SECTOR(S) */
AL_reg(context) = 0; /* number of sectors verified */
AH_reg(context) = 0;
break;
case 0x05: /* FORMAT TRACK */
case 0x06: /* FORMAT TRACK AND SET BAD SECTOR FLAGS */
case 0x07: /* FORMAT DRIVE STARTING AT GIVEN TRACK */
/* despite what Ralf Brown says, 0x06 and 0x07 seem to
* set CFLAG, too (at least my BIOS does that) */
AH_reg(context) = 0x0c;
SET_CFLAG(context);
break;
case 0x08: /* GET DRIVE PARAMETERS */
if (DL_reg(context) & 0x80) { /* hard disk ? */
AH_reg(context) = 0x07;
SET_CFLAG(context);
}
else { /* floppy disk */
#ifdef linux
unsigned int i, nr_of_drives = 0;
BYTE drive_nr = DL_reg(context);
int floppy_fd;
struct floppy_drive_params floppy_parm;
char root[] = "A:\\";
AH_reg(context) = 0x00; /* success */
for (i = 0; i < MAX_DOS_DRIVES; i++, root[0]++)
if (GetDriveTypeA(root) == DRIVE_REMOVABLE) nr_of_drives++;
DL_reg(context) = nr_of_drives;
if (drive_nr > 1) { /* invalid drive ? */
BX_reg(context) = 0;
CX_reg(context) = 0;
DH_reg(context) = 0;
break;
}
if ( (floppy_fd = DRIVE_OpenDevice( drive_nr, O_NONBLOCK)) == -1)
{
WARN("(GET DRIVE PARAMETERS): Can't determine floppy geometry !\n");
BX_reg(context) = 0;
CX_reg(context) = 0;
DH_reg(context) = 0;
break;
}
ioctl(floppy_fd, FDGETDRVPRM, &floppy_parm);
close(floppy_fd);
BL_reg(context) = floppy_parm.cmos;
/* CH = low eight bits of max cyl
CL = max sec nr (bits 5-0),
hi two bits of max cyl (bits 7-6)
DH = max head nr */
DH_reg(context) = 0x01;
switch (BL_reg(context))
{
case 0: /* no drive */
CX_reg(context) = 0x0;
DX_reg(context) = 0x0;
break;
case 1: /* 360 K */
CX_reg(context) = 0x2709;
break;
case 2: /* 1.2 M */
CX_reg(context) = 0x4f0f;
break;
case 3: /* 720 K */
CX_reg(context) = 0x4f09;
break;
case 4: /* 1.44 M */
CX_reg(context) = 0x4f12;
break;
case 5:
case 6: /* 2.88 M */
CX_reg(context) = 0x4f24;
break;
}
context->SegEs = 0x0000; /* FIXME: drive parameter table */
DI_reg(context) = 0x0000;
#else
AH_reg(context) = 0x01;
SET_CFLAG(context);
break;
#endif
}
break;
case 0x09: /* INITIALIZE CONTROLLER WITH DRIVE PARAMETERS */
case 0x0a: /* FIXED DISK - READ LONG (XT,AT,XT286,PS) */
case 0x0b: /* FIXED DISK - WRITE LONG (XT,AT,XT286,PS) */
case 0x0c: /* SEEK TO CYLINDER */
case 0x0d: /* ALTERNATE RESET HARD DISKS */
case 0x10: /* CHECK IF DRIVE READY */
case 0x11: /* RECALIBRATE DRIVE */
case 0x14: /* CONTROLLER INTERNAL DIAGNOSTIC */
AH_reg(context) = 0;
break;
case 0x15: /* GET DISK TYPE (AT,XT2,XT286,CONV,PS) */
if (DL_reg(context) & 0x80) { /* hard disk ? */
AH_reg(context) = 3; /* fixed disk */
SET_CFLAG(context);
}
else { /* floppy disk ? */
AH_reg(context) = 2; /* floppy with change detection */
SET_CFLAG(context);
}
break;
case 0x0e: /* READ SECTOR BUFFER (XT only) */
case 0x0f: /* WRITE SECTOR BUFFER (XT only) */
case 0x12: /* CONTROLLER RAM DIAGNOSTIC (XT,PS) */
case 0x13: /* DRIVE DIAGNOSTIC (XT,PS) */
AH_reg(context) = 0x01;
SET_CFLAG(context);
break;
case 0x16: /* FLOPPY - CHANGE OF DISK STATUS */
AH_reg(context) = 0; /* FIXME - no change */
break;
case 0x17: /* SET DISK TYPE FOR FORMAT */
if (DL_reg(context) < 4)
AH_reg(context) = 0x00; /* successful completion */
else
AH_reg(context) = 0x01; /* error */
break;
case 0x18: /* SET MEDIA TYPE FOR FORMAT */
if (DL_reg(context) < 4)
AH_reg(context) = 0x00; /* successful completion */
else
AH_reg(context) = 0x01; /* error */
break;
case 0x19: /* FIXED DISK - PARK HEADS */
default:
INT_BARF( context, 0x13 );
}
}