| /* |
| * BIOS interrupt 13h handler |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/ioctl.h> |
| #include <fcntl.h> |
| #ifdef linux |
| #include <linux/fd.h> |
| #endif |
| #include "miscemu.h" |
| #include "stddebug.h" |
| /* #define DEBUG_INT */ |
| #include "debug.h" |
| #include "drive.h" |
| |
| /********************************************************************** |
| * INT_Int13Handler |
| * |
| * Handler for int 13h (disk I/O). |
| */ |
| void WINAPI INT_Int13Handler( CONTEXT *context ) |
| { |
| switch(AH_reg(context)) |
| { |
| case 0x00: /* RESET DISK SYSTEM */ |
| case 0x04: /* VERIFY DISK SECTOR(S) */ |
| 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; |
| |
| AH_reg(context) = 0x00; /* success */ |
| |
| for (i = 0; i < MAX_DOS_DRIVES; i++) |
| if (DRIVE_GetType(i) == TYPE_FLOPPY) 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) |
| { |
| fprintf(stderr, "INT 0x13 (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; |
| } |
| ES_reg(context) = 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 0x0c: /* SEEK TO CYLINDER */ |
| case 0x0d: /* RESET HARD DISKS */ |
| case 0x10: /* CHECK IF DRIVE READY */ |
| case 0x11: /* RECALIBRATE DRIVE */ |
| case 0x14: /* CONTROLLER INTERNAL DIAGNOSTIC */ |
| AH_reg(context) = 0; |
| 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; |
| |
| default: |
| INT_BARF( context, 0x13 ); |
| } |
| } |