151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/*
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* BIOS interrupt 13h handler
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#ifdef linux
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#include <linux/fd.h>
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#endif
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#include "miscemu.h"
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/* #define DEBUG_INT */
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#include "debug.h"
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#include "drive.h"
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/**********************************************************************
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* INT_Int13Handler
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*
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* Handler for int 13h (disk I/O).
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*/
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void WINAPI INT_Int13Handler( CONTEXT *context )
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{
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switch(AH_reg(context))
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{
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case 0x00: /* RESET DISK SYSTEM */
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case 0x04: /* VERIFY DISK SECTOR(S) */
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AH_reg(context) = 0;
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break;
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case 0x05: /* FORMAT TRACK */
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case 0x06: /* FORMAT TRACK AND SET BAD SECTOR FLAGS */
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case 0x07: /* FORMAT DRIVE STARTING AT GIVEN TRACK */
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/* despite what Ralf Brown says, 0x06 and 0x07 seem to
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* set CFLAG, too (at least my BIOS does that) */
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AH_reg(context) = 0x0c;
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SET_CFLAG(context);
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break;
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case 0x08: /* GET DRIVE PARAMETERS */
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if (DL_reg(context) & 0x80) { /* hard disk ? */
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AH_reg(context) = 0x07;
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SET_CFLAG(context);
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}
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else { /* floppy disk */
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#ifdef linux
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unsigned int i, nr_of_drives = 0;
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BYTE drive_nr = DL_reg(context);
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int floppy_fd;
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struct floppy_drive_params floppy_parm;
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AH_reg(context) = 0x00; /* success */
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for (i = 0; i < MAX_DOS_DRIVES; i++)
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if (DRIVE_GetType(i) == TYPE_FLOPPY) nr_of_drives++;
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DL_reg(context) = nr_of_drives;
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if (drive_nr > 1) { /* invalid drive ? */
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BX_reg(context) = 0;
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CX_reg(context) = 0;
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DH_reg(context) = 0;
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break;
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}
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if ( (floppy_fd = DRIVE_OpenDevice( drive_nr, O_NONBLOCK)) == -1)
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{
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WARN(int, "(GET DRIVE PARAMETERS): Can't determine floppy geometry !\n");
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BX_reg(context) = 0;
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CX_reg(context) = 0;
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DH_reg(context) = 0;
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break;
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}
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ioctl(floppy_fd, FDGETDRVPRM, &floppy_parm);
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close(floppy_fd);
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BL_reg(context) = floppy_parm.cmos;
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/* CH = low eight bits of max cyl
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CL = max sec nr (bits 5-0),
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hi two bits of max cyl (bits 7-6)
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DH = max head nr */
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DH_reg(context) = 0x01;
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switch (BL_reg(context))
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{
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case 0: /* no drive */
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CX_reg(context) = 0x0;
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DX_reg(context) = 0x0;
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break;
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case 1: /* 360 K */
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CX_reg(context) = 0x2709;
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break;
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case 2: /* 1.2 M */
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CX_reg(context) = 0x4f0f;
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break;
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case 3: /* 720 K */
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CX_reg(context) = 0x4f09;
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break;
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case 4: /* 1.44 M */
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CX_reg(context) = 0x4f12;
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break;
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case 5:
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case 6: /* 2.88 M */
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CX_reg(context) = 0x4f24;
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break;
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}
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ES_reg(context) = 0x0000; /* FIXME: drive parameter table */
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DI_reg(context) = 0x0000;
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#else
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AH_reg(context) = 0x01;
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SET_CFLAG(context);
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break;
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#endif
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}
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break;
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case 0x09: /* INITIALIZE CONTROLLER WITH DRIVE PARAMETERS */
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case 0x0c: /* SEEK TO CYLINDER */
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case 0x0d: /* RESET HARD DISKS */
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case 0x10: /* CHECK IF DRIVE READY */
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case 0x11: /* RECALIBRATE DRIVE */
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case 0x14: /* CONTROLLER INTERNAL DIAGNOSTIC */
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AH_reg(context) = 0;
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break;
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case 0x0e: /* READ SECTOR BUFFER (XT only) */
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case 0x0f: /* WRITE SECTOR BUFFER (XT only) */
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case 0x12: /* CONTROLLER RAM DIAGNOSTIC (XT,PS) */
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case 0x13: /* DRIVE DIAGNOSTIC (XT,PS) */
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AH_reg(context) = 0x01;
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SET_CFLAG(context);
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break;
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case 0x17: /* SET DISK TYPE FOR FORMAT */
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if (DL_reg(context) < 4)
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AH_reg(context) = 0x00; /* successful completion */
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else
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AH_reg(context) = 0x01; /* error */
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break;
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case 0x18:
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if (DL_reg(context) < 4)
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AH_reg(context) = 0x00; /* successful completion */
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else
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AH_reg(context) = 0x01; /* error */
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break;
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default:
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INT_BARF( context, 0x13 );
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}
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}
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