mirror of
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39a1ad8654
o Make the dos emulation treat c: and C: the same way. Sourcer was doing a chdir("c:\\") rather than a chdir("C:\\"); o use drlton() in all places where we used to use -'A' so that we're always case independent. o use drntol() in all places where we used to use + 'A' for similar reasons
873 lines
20 KiB
C
873 lines
20 KiB
C
/*
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* Copyright (c) 1992, 1993, 1996
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* Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Berkeley Software
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* Design, Inc.
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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* BSDI int13.c,v 2.3 1996/04/08 19:32:43 bostic Exp
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*
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* $Id: int13.c,v 1.1 1997/08/09 01:42:46 dyson Exp $
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*/
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#include "doscmd.h"
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#include <sys/ioctl.h>
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#define FDCHANGED _IOR('F', 64, int)
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#define INT13_ERR_NONE 0x00
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#define INT13_ERR_BAD_COMMAND 0x01
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#define INT13_ERR_BAD_ADDRESS_MARK 0x02
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#define INT13_ERR_WRITE_PROTECT 0x03
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#define INT13_ERR_SECTOR_ID_BAD 0x04
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#define INT13_ERR_RESET_FAILURE 0x05
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#define INT13_ERR_CLL_ACTIVE 0x06
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#define INT13_ERR_ACT_FAILED 0x07
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#define INT13_ERR_DMA_OVERRUN 0x08
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#define INT13_ERR_DMA_BOUNDARY 0x09
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#define INT13_ERR_BAD_TRACK_FLAG 0x0B
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#define INT13_ERR_MEDIA_TYP_UNKNOWN 0x0C
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#define INT13_ERR_CRC 0x10
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#define INT13_ERR_CORRECTED 0x11
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#define INT13_ERR_CTRLR_FAILURE 0x20
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#define INT13_ERR_SEEK 0x40
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#define INT13_ERR_TIME_OUT 0x80
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#define INT13_ERR_NOT_READY 0xAA
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#define INT13_ERR_UNDEFINED 0xBB
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#define INT13_ERR_SENSE_OPERATION 0xFF
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typedef struct {
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u_char bootIndicator;
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u_char beginHead;
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u_char beginSector;
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u_char beginCyl;
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u_char systemID;
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u_char endHead;
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u_char endSector;
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u_char endCyl;
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u_long relSector;
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u_long numSectors;
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} PTAB;
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struct diskinfo {
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int type;
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int sectors;
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int cylinders;
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int sides;
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int secsize;
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int fd;
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char *path;
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u_long location;
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u_char *sector0;
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u_long offset;
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char *list[4]; /* Up to 4 devices allowed */
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unsigned multi:2;
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int read_only:1;
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int removeable:1;
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int changed:1; /* Set if we change format */
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};
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#define hd_status (*(u_char *)0x474)
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#define fd_status (*(u_char *)0x441)
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static inline int
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disize(struct diskinfo *di)
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{
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return(di->sectors * di->cylinders * di->sides);
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}
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static inline int
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cylsize(struct diskinfo *di)
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{
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return(di->sectors * di->sides);
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}
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static u_long ftable = 0xF1000; /* Floppy table */
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static u_long htable = 0xF1020; /* Hard disk table */
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static struct diskinfo diskinfo[26] = { 0 };
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static struct diskinfo floppyinfo[] = {
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{ 0, 9, 40, 1, 512, -1, 0, 0, }, /* Probably not correct */
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{ 1, 9, 40, 2, 512, -1, 0, 0, },
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{ 2, 9, 80, 2, 512, -1, 0, 0, },
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{ 3, 15, 80, 2, 512, -1, 0, 0, },
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{ 4, 18, 80, 2, 512, -1, 0, 0, },
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{ 6, 36, 80, 2, 512, -1, 0, 0, },
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{ -1, 0, 0, 0, 0, 0, 0, 0, },
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};
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static struct diskinfo *
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getdisk(int drive)
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{
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struct diskinfo *di;
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if (drive >= 2 && drive < 0x80) {
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return(0);
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}
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if (drive >= 0x80) {
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drive -= 0x80;
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drive += 2;
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}
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if (drive > 25 || diskinfo[drive].path == 0) {
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return(0);
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}
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di = &diskinfo[drive];
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if (di->fd < 0) {
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if (di->removeable) {
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di->read_only = 0;
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if (!(di->path = di->list[di->multi]))
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di->path = di->list[di->multi = 0];
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}
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if ((di->fd = open(di->path, di->read_only ? O_RDONLY
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: O_RDWR|O_FSYNC)) < 0 &&
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(di->read_only = 1) &&
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(di->fd = open(di->path, O_RDONLY)) < 0) {
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return(0);
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}
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di->fd = squirrel_fd(di->fd);
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}
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return(di);
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}
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int
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disk_fd(int drive)
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{
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struct diskinfo *di;
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if (drive > 1)
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drive += 0x80 - 2;
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di = getdisk(drive);
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if (!di)
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return(-1);
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return(di->fd);
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}
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void
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make_readonly(int drive)
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{
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if (drive < 0 || drive >= 26)
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return;
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diskinfo[drive].read_only = 1;
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}
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int
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init_hdisk(int drive, int cyl, int head, int tracksize, char *file, char *fake_ptab)
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{
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struct diskinfo *di;
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u_long table;
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if (drive < 0) {
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for (drive = 2; drive < 26; ++drive) {
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if (diskinfo[drive].path == 0)
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break;
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}
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}
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if (drive < 2) {
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fprintf(stderr, "Only floppies may be assigned to A: or B:\n");
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return(-1);
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}
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if (drive >= 26) {
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fprintf(stderr, "Too many disk drives (only 24 allowed)\n");
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return(-1);
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}
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di = &diskinfo[drive];
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if (di->path) {
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fprintf(stderr, "Drive %c: already assigned to %s\n", drntol(drive),
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di->path);
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return(-1);
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}
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di->fd = -1;
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di->sectors = tracksize;
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di->cylinders = cyl;
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di->sides = head;
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di->sector0 = 0;
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di->offset = 0;
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if (fake_ptab) {
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u_char buf[512];
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int fd;
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PTAB *ptab;
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int clusters;
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if ((fd = open(fake_ptab, 0)) < 0) {
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perror(fake_ptab);
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return(-1);
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}
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di->sector0 = malloc(512);
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if (!di->sector0) {
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perror("malloc in init_hdisk");
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quit(1);
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}
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read(fd, di->sector0, 512);
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close(fd);
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ptab = (PTAB *)(di->sector0 + 0x01BE);
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for (fd = 0; fd < 4; ++fd) {
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if (*(u_short *)(di->sector0 + 0x1FE) == 0xAA55 &&
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ptab[fd].numSectors == head * tracksize * cyl &&
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(ptab[fd].systemID == 1 || ptab[fd].systemID == 4))
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break;
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}
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if (fd < 4) {
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if (fd)
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memcpy(ptab, ptab + fd, sizeof(PTAB));
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memset(ptab + 1, 0, sizeof(PTAB) * 3);
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di->offset = ptab[fd].relSector;
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di->cylinders += di->offset / cylsize(di);
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} else {
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memset(ptab, 0, sizeof(PTAB) * 4);
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ptab->beginHead = 0;
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ptab->beginSector = 1; /* this is 1 based */
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ptab->beginCyl = 1;
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ptab->endHead = head - 1;
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ptab->endSector = tracksize; /* this is 1 based */
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ptab->endCyl = cyl & 0xff;
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ptab->endSector |= (cyl & 0x300) >> 2;
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ptab->relSector = head * tracksize;
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ptab->numSectors = head * tracksize * cyl;
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*(u_short *)(di->sector0 + 0x1FE) = 0xAA55;
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fd = open(file, 0);
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if (fd < 0) {
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perror(file);
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return(-1);
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}
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memset(buf, 0, 512);
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read(fd, buf, 512);
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close(fd);
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if ((clusters = buf[0x0D]) == 0) {
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if (disize(di) <= 128 * 2048)
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clusters = 4;
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else if (disize(di) <= 256 * 2048)
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clusters = 8;
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else if (disize(di) <= 8 * 1024 * 2048)
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clusters = 16;
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else if (disize(di) <= 16 * 1024 * 2048)
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clusters = 32;
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else
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clusters = 64;
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}
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if ((disize(di) / clusters) <= 4096) {
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ptab->systemID = 0x01;
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} else {
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ptab->systemID = 0x04;
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}
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di->cylinders += 1; /* Extra cylinder for partition table, etc. */
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}
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ptab->bootIndicator = 0x80;
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}
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di->type = 0xf8;
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di->path = file;
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di->secsize = 512;
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di->path = strdup(file);
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di->location = ((table & 0xf0000) << 12) | (table & 0xffff);
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if (drive == 0) {
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ivec[0x41] = di->location;
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} else if (drive == 1) {
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ivec[0x46] = di->location;
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}
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table = htable + (drive - 2) * 0x10;
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*(u_short *)(table+0x00) = di->cylinders-1; /* Cylinders */
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*(u_char *)(table+0x02) = di->sides; /* Heads */
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*(u_short *)(table+0x03) = 0; /* 0 */
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*(u_short *)(table+0x05) = 0xffff; /* write pre-comp */
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*(u_char *)(table+0x07) = 0; /* ECC Burst length */
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*(u_char *)(table+0x08) = 0; /* Control Byte */
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*(u_char *)(table+0x09) = 0; /* standard timeout */
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*(u_char *)(table+0x0a) = 0; /* formatting timeout */
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*(u_char *)(table+0x0b) = 0; /* timeout for checking drive */
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*(u_short *)(table+0x0c) = di->cylinders-1; /* landing zone */
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*(u_char *)(table+0x0e) = di->sectors; /* sectors/track */
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*(u_char *)(table+0x0f) = 0;
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if ((drive - 1) >= ndisks)
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ndisks = drive - 1;
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return(drive);
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}
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static inline
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bps(int size)
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{
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switch (size) {
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case 128: return(0);
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case 256: return(1);
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case 512: return(2);
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case 1024: return(3);
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default:
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fprintf(stderr, "Invalid sector size: %d\n", size);
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quit(1);
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}
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}
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int
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init_floppy(int drive, int type, char *file)
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{
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struct diskinfo *di = floppyinfo;
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u_long table;
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struct stat sb;
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while (di->type >= 0 && di->type != type && disize(di)/2 != type)
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++di;
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if (!di->type) {
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fprintf(stderr, "Invalid floppy type: %d\n", type);
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return(-1);
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}
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if (drive < 0) {
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if (diskinfo[0].path == 0) {
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drive = 0;
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} else if (diskinfo[1].path == 0) {
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drive = 1;
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} else {
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fprintf(stderr, "Too many floppy drives (only 2 allowed)\n");
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return(-1);
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}
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}
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if (drive > 1) {
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fprintf(stderr, "Floppies must be either drive A: or B:\n");
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return(-1);
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}
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if (drive >= nfloppies)
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nfloppies = drive + 1;
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if (diskinfo[drive].path == 0) {
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diskinfo[drive] = *di;
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}
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di = &diskinfo[drive];
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if (stat(file, &sb) < 0) {
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fprintf(stderr, "Drive %c: Could not stat %s\n", drntol(drive), file);
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return(-1);
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}
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if (drive < 2 && (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode))) {
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if (di->path && !di->removeable) {
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fprintf(stderr, "Drive %c: is not removeable and hence can only have one assignment\n", drntol(drive));
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return(-1);
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}
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di->removeable = 1;
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} else if (di->removeable) {
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fprintf(stderr, "Drive %c: already assigned to %s\n", drntol(drive),
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di->path);
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return(-1);
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}
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if (di->removeable) {
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#if 0 /*XXXXX*/
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if (di->multi == 4) {
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fprintf(stderr, "Drive %c: already assigned 4 devices\n",
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drntol(drive));
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return(-1);
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}
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#endif
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di->path = di->list[di->multi++] = strdup(file);
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} else {
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if (di->path) {
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fprintf(stderr, "Drive %c: already assigned to %s\n",
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drntol(drive), di->path);
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return(-1);
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}
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di->path = strdup(file);
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}
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di->fd = -1;
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di->location = ((table & 0xf0000) << 12) | (table & 0xffff);
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di->sector0 = 0;
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di->offset = 0;
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ivec[0x1e] = ((ftable & 0xf0000) << 12) | (ftable & 0xffff);
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table = ftable + drive * 0x0a;
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*(u_char *)(table+0x00) = 0xdf; /* First Specify Byte */
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*(u_char *)(table+0x01) = 0x02; /* Second Specify Byte */
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*(u_char *)(table+0x02) = 0x25; /* Timer ticks to wait 'til motor OFF */
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*(u_char *)(table+0x03) = bps(di->secsize); /* Number of bytes/sector */
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*(u_char *)(table+0x04) = di->sectors; /* Number of sectors/track */
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*(u_char *)(table+0x05) = 0x1b; /* Gap length, in bytes */
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*(u_char *)(table+0x06) = 0xff; /* Data length, in bytes */
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*(u_char *)(table+0x07) = 0x6c; /* Gap length for format */
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*(u_char *)(table+0x09) = 0xf6; /* Fill byte for formatting */
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*(u_char *)(table+0x09) = 0x0f; /* Head settle time, in milliseconds */
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*(u_char *)(table+0x0a) = 0x08; /* Motor startup time, in 1/8 seconds */
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return(drive);
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}
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int
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search_floppy(int i)
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{
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return(i < nfloppies ? diskinfo[i].type : 0);
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}
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static int icnt = 0;
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#define seterror(err) { \
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if (drive & 0x80) \
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hd_status = err; \
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else \
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fd_status = err; \
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R_AH = err; \
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R_FLAGS |= PSL_C; \
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}
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static int
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trynext(struct diskinfo *di)
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{
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close(di->fd);
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di->fd = -1;
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di->changed = 1;
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#if 0 /*XXXXX*/
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if (di->multi++ >= 4)
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return(0);
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#endif
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if (di->list[di->multi] && (di = getdisk(di - diskinfo))) {
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di->multi = 0;
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return(1);
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}
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return(0);
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}
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static int
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diread(struct diskinfo *di, regcontext_t *REGS,
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off_t start, char *addr, int sectors)
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{
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off_t res;
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int drive = di - diskinfo;
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di->multi = -1;
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if (drive > 1) {
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drive -= 2;
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drive |= 0x80;
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}
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again:
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res = lseek(di->fd, start * di->secsize, 0);
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if (res < 0 && di->removeable && trynext(di))
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goto again;
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if (res < 0) {
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seterror(INT13_ERR_SEEK);
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return(-1);
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}
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res = read(di->fd, addr, sectors * di->secsize);
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if (res < 0 && di->removeable && trynext(di))
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goto again;
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if (di->removeable) {
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if (res < 0) {
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seterror(INT13_ERR_NOT_READY);
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return(-1);
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}
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return(res / di->secsize);
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}
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/*
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* reads always work, if if they don't.
|
|
* Just pretend any byte not read was actually a 0
|
|
*/
|
|
if (res < 0)
|
|
memset(addr, 0, sectors * di->secsize);
|
|
else if (res < sectors * di->secsize)
|
|
memset(addr + res, 0, sectors * di->secsize - res);
|
|
|
|
return(sectors);
|
|
}
|
|
|
|
static int
|
|
diwrite(struct diskinfo *di, regcontext_t *REGS,
|
|
off_t start, char *addr, int sectors)
|
|
{
|
|
off_t res;
|
|
int drive = di - diskinfo;
|
|
di->multi = -1;
|
|
|
|
if (drive > 1) {
|
|
drive -= 2;
|
|
drive |= 0x80;
|
|
}
|
|
|
|
again:
|
|
res = lseek(di->fd, start * di->secsize, 0);
|
|
|
|
if (res < 0 && di->removeable && trynext(di))
|
|
goto again;
|
|
|
|
if (res < 0) {
|
|
seterror(INT13_ERR_SEEK);
|
|
return(-1);
|
|
}
|
|
|
|
res = write(di->fd, addr, sectors * di->secsize);
|
|
|
|
if (res < 0 && di->removeable && trynext(di))
|
|
goto again;
|
|
|
|
if (di->removeable) {
|
|
if (res < 0) {
|
|
seterror(INT13_ERR_NOT_READY);
|
|
return(-1);
|
|
}
|
|
} else if (res < 0) {
|
|
seterror(INT13_ERR_WRITE_PROTECT);
|
|
return(-1);
|
|
}
|
|
return(res / di->secsize);
|
|
}
|
|
|
|
static void
|
|
int13(regcontext_t *REGS)
|
|
{
|
|
char *addr;
|
|
int sectors;
|
|
struct diskinfo *di;
|
|
off_t start;
|
|
int did;
|
|
|
|
int cyl;
|
|
int sector;
|
|
int side;
|
|
int drive;
|
|
|
|
reset_poll();
|
|
|
|
R_FLAGS &= ~PSL_C;
|
|
|
|
drive = R_DL;
|
|
|
|
if (R_AX != 0x01) {
|
|
if (drive & 0x80)
|
|
hd_status = 0;
|
|
else
|
|
fd_status = 0;
|
|
}
|
|
|
|
switch (R_AH) {
|
|
case 0x00: /* Reset */
|
|
break;
|
|
case 0x01: /* Read disk status */
|
|
if (drive & 0x80)
|
|
R_AH = hd_status;
|
|
else
|
|
R_AH = fd_status;
|
|
if (R_AH)
|
|
R_FLAGS |= PSL_C;
|
|
break;
|
|
case 0x02: /* Read */
|
|
R_AH = 0;
|
|
addr = (char *)N_GETPTR(R_ES, R_BX);
|
|
sectors = R_AL;
|
|
side = R_DH;
|
|
R_AL = 0; /* Start out with nothing read */
|
|
|
|
if (drive & 0x80) {
|
|
cyl = R_CH | ((R_CL & 0xc0) << 2);
|
|
sector = (R_CL & 0x3f) - 1;
|
|
} else {
|
|
sector = R_CL - 1;
|
|
cyl = R_CH;
|
|
}
|
|
|
|
if ((di = getdisk(drive)) == 0) {
|
|
debug(D_DISK, "Bad drive: %02x (%d : %d : %d)\n",
|
|
drive, cyl, side, sector);
|
|
seterror(INT13_ERR_BAD_COMMAND);
|
|
break;
|
|
}
|
|
start = cyl * di->sectors * di->sides +
|
|
side * di->sectors +
|
|
sector;
|
|
|
|
if (start >= disize(di)) {
|
|
debug(D_DISK, "Read past end of disk\n");
|
|
seterror(INT13_ERR_SEEK);
|
|
break;
|
|
}
|
|
if (sectors + start >= disize(di)) {
|
|
sectors = disize(di) - start;
|
|
}
|
|
|
|
if (di->sector0) {
|
|
if (start < di->offset) {
|
|
R_AL = sectors;
|
|
if (start == 0) {
|
|
memcpy(addr, di->sector0, di->secsize);
|
|
addr += di->secsize;
|
|
--sectors;
|
|
}
|
|
memset(addr, 0, sectors * di->secsize);
|
|
break;
|
|
} else {
|
|
start -= di->offset;
|
|
}
|
|
}
|
|
debug(D_DISK, "%02x: Read %2d sectors from %qd to %04x:%04x\n",
|
|
drive, sectors, start, R_ES, R_BX);
|
|
|
|
if ((did = diread(di, REGS, start, addr, sectors)) >= 0)
|
|
R_AL = did;
|
|
#if 0
|
|
callint(0x0d);
|
|
callint(0x76);
|
|
#endif
|
|
break;
|
|
|
|
case 0x03: /* Write */
|
|
R_AH = 0;
|
|
addr = (char *)GETPTR(R_ES, R_BX);
|
|
sectors = R_AL;
|
|
side = R_DH;
|
|
R_AL = 0; /* Start out with nothing written */
|
|
|
|
if (drive & 0x80) {
|
|
cyl = R_CH | ((R_CL & 0xc0) << 2);
|
|
sector = (R_CL & 0x3f) - 1;
|
|
} else {
|
|
sector = R_CL - 1;
|
|
cyl = R_CH;
|
|
}
|
|
|
|
if ((di = getdisk(drive)) == 0) {
|
|
debug(D_DISK, "Bad drive: %d (%d : %d : %d)\n",
|
|
drive, cyl, side, sector);
|
|
seterror(INT13_ERR_BAD_COMMAND);
|
|
break;
|
|
}
|
|
if (di->read_only) {
|
|
debug(D_DISK, "%02x: Attempt to write readonly disk\n", drive);
|
|
seterror(INT13_ERR_WRITE_PROTECT);
|
|
break;
|
|
}
|
|
start = cyl * di->sectors * di->sides +
|
|
side * di->sectors +
|
|
sector;
|
|
|
|
if (start >= disize(di)) {
|
|
debug(D_DISK, "Write past end of disk\n");
|
|
seterror(INT13_ERR_SEEK);
|
|
break;
|
|
}
|
|
|
|
if (sectors + start >= disize(di))
|
|
sectors = disize(di) - start;
|
|
|
|
if (di->sector0) {
|
|
if (start < di->offset) {
|
|
R_AL = sectors;
|
|
break;
|
|
} else {
|
|
start -= di->offset;
|
|
}
|
|
}
|
|
|
|
debug(D_DISK, "%02x: Write %2d sectors from %qd to %04x:%04x\n",
|
|
drive, sectors, start, R_ES, R_BX);
|
|
|
|
if ((did = diwrite(di, REGS, start, addr, sectors)) >= 0)
|
|
R_AL = did;
|
|
#if 0
|
|
callint(0x0d);
|
|
callint(0x76);
|
|
#endif
|
|
break;
|
|
|
|
case 0x04: /* Verify */
|
|
R_AH = 0;
|
|
sectors = R_AL;
|
|
side = R_DH;
|
|
|
|
if (drive & 0x80) {
|
|
cyl = R_CH | ((R_CL & 0xc0) << 2);
|
|
sector = (R_CL & 0x3f) - 1;
|
|
} else {
|
|
sector = R_CL - 1;
|
|
cyl = R_CH;
|
|
}
|
|
|
|
if ((di = getdisk(drive)) == 0) {
|
|
debug(D_DISK, "Bad drive: %d (%d : %d : %d)\n",
|
|
drive, cyl, side, sector);
|
|
seterror(INT13_ERR_BAD_COMMAND);
|
|
break;
|
|
}
|
|
start = cyl * di->sectors * di->sides +
|
|
side * di->sectors +
|
|
sector;
|
|
|
|
if (start >= disize(di)) {
|
|
debug(D_DISK, "Verify past end of disk\n");
|
|
seterror(INT13_ERR_SEEK);
|
|
break;
|
|
}
|
|
|
|
if (sectors + start >= disize(di))
|
|
sectors = disize(di) - start;
|
|
|
|
if (di->sector0) {
|
|
if (start < di->offset)
|
|
break;
|
|
else
|
|
start -= di->offset;
|
|
}
|
|
|
|
debug(D_DISK, "Verify %2d sectors from %d\n",
|
|
sectors, start);
|
|
if (lseek(di->fd, start * di->secsize, 0) < 0) {
|
|
debug(D_DISK, "Seek error\n");
|
|
seterror(INT13_ERR_SEEK);
|
|
break;
|
|
}
|
|
while (sectors > 0) {
|
|
char buf[512];
|
|
if (read(di->fd, buf, di->secsize) != di->secsize) {
|
|
debug(D_DISK, "Verify error\n");
|
|
seterror(0x04);
|
|
break;
|
|
}
|
|
--sectors;
|
|
}
|
|
#if 0
|
|
callint(0x0d);
|
|
callint(0x76);
|
|
#endif
|
|
break;
|
|
|
|
case 0x05: /* Format track */
|
|
seterror(INT13_ERR_BAD_COMMAND);
|
|
break;
|
|
|
|
case 0x08: /* Status */
|
|
R_AH = 0;
|
|
|
|
if ((di = getdisk(drive)) == 0) {
|
|
debug(D_DISK, "Bad drive: %d\n", drive);
|
|
seterror(INT13_ERR_BAD_COMMAND);
|
|
break;
|
|
}
|
|
R_AX = 0;
|
|
|
|
R_BX = di->type;
|
|
if ((drive & 0x80) == 0)
|
|
N_PUTVEC(R_ES, R_DI, di->location);
|
|
|
|
R_CL = di->sectors | ((di->cylinders >> 2) & 0xc0);
|
|
R_CH = di->cylinders & 0xff;
|
|
R_DL = (drive & 0x80) ? ndisks : nfloppies;
|
|
R_DH = di->sides - 1;
|
|
debug(D_DISK, "%02x: Status requested: sec %d cyl %d side %d drive %d\n",
|
|
drive, R_CL, R_CH, R_DH, R_DL);
|
|
#if 0
|
|
callint(0x0d);
|
|
callint(0x76);
|
|
#endif
|
|
break;
|
|
|
|
case 0x0c: /* Move read/write head */
|
|
case 0x0d: /* Reset */
|
|
break;
|
|
|
|
case 0x10: /* check for disk ready */
|
|
R_AH = 0; /* always open for business */
|
|
break;
|
|
|
|
case 0x15:
|
|
if ((di = getdisk(drive)) == 0) {
|
|
R_AH = 0;
|
|
R_FLAGS |= PSL_C;
|
|
break;
|
|
}
|
|
|
|
if (drive & 0x80) {
|
|
start = di->sectors * di->cylinders * di->sides;
|
|
R_CX = start >> 16;
|
|
R_DX = start;
|
|
R_AH = 3;
|
|
} else {
|
|
R_AH = 1; /* Non-changeable disk */
|
|
}
|
|
break;
|
|
|
|
case 0x16: /* Media change */
|
|
R_AH = 0;
|
|
if ((di = getdisk(drive)) && di->changed) {
|
|
di->changed = 0;
|
|
R_AH = 6;
|
|
}
|
|
break;
|
|
|
|
case 0x17: /* Determine floppy disk format */
|
|
seterror(INT13_ERR_BAD_COMMAND);
|
|
break;
|
|
|
|
case 0x18: /* Determine disk format */
|
|
if ((di = getdisk(drive)) == 0) {
|
|
R_AH = 0;
|
|
R_FLAGS |= PSL_C;
|
|
break;
|
|
}
|
|
/* XXX incomplete? */
|
|
break;
|
|
|
|
default:
|
|
unknown_int2(0x13, R_AH, REGS);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
disk_bios_init(void)
|
|
{
|
|
u_long vec;
|
|
|
|
vec = insert_softint_trampoline();
|
|
ivec[0x13] = vec;
|
|
register_callback(vec, int13, "int 13");
|
|
|
|
vec = insert_null_trampoline();
|
|
ivec[0x76] = vec;
|
|
}
|