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devopen.c revision 1.2 
      1 /*	$NetBSD: devopen.c,v 1.2 2004/03/24 16:54:18 drochner Exp $	 */
      2 
      3 /*
      4  * Copyright (c) 1996, 1997
      5  *	Matthias Drochner.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 
     29 #include <sys/types.h>
     30 
     31 #include <lib/libsa/stand.h>
     32 #include <lib/libkern/libkern.h>
     33 
     34 #include <libi386.h>
     35 #include <biosdisk.h>
     36 #include "devopen.h"
     37 #ifdef _STANDALONE
     38 #include <bootinfo.h>
     39 #endif
     40 #ifdef SUPPORT_PS2
     41 #include <biosmca.h>
     42 #endif
     43 
     44 static __inline int dev2bios __P((char *, unsigned int, int *));
     45 
     46 static __inline int
     47 dev2bios(devname, unit, biosdev)
     48 	char           *devname;
     49 	unsigned int    unit;
     50 	int            *biosdev;
     51 {
     52 	if (strcmp(devname, "hd") == 0)
     53 		*biosdev = 0x80 + unit;
     54 	else if (strcmp(devname, "fd") == 0)
     55 		*biosdev = 0x00 + unit;
     56 	else
     57 		return (ENXIO);
     58 
     59 	return (0);
     60 }
     61 
     62 int
     63 bios2dev(int biosdev, char **devname, u_int *unit, u_int sector, u_int *ptnp)
     64 {
     65 	if (biosdev & 0x80)
     66 		*devname = "hd";
     67 	else
     68 		*devname = "fd";
     69 
     70 	*unit = biosdev & 0x7f;
     71 	*ptnp = biosdiskfindptn(biosdev, sector);
     72 
     73 	return 0;
     74 }
     75 
     76 #ifdef _STANDALONE
     77 struct btinfo_bootpath bibp;
     78 #endif
     79 
     80 /*
     81  * Open the BIOS disk device
     82  */
     83 int
     84 devopen(f, fname, file)
     85 	struct open_file *f;
     86 	const char     *fname;
     87 	char          **file;
     88 {
     89 	char           *fsname, *devname;
     90 	unsigned int    unit, partition;
     91 	int             biosdev;
     92 	int             error;
     93 	struct devsw   *dp;
     94 
     95 	if ((error = parsebootfile(fname, &fsname, &devname,
     96 				   &unit, &partition, (const char **) file))
     97 	    || (error = dev2bios(devname, unit, &biosdev)))
     98 		return (error);
     99 
    100 	dp = &devsw[0];		/* must be biosdisk */
    101 	f->f_dev = dp;
    102 
    103 #ifdef _STANDALONE
    104 	strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
    105 	BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
    106 #endif
    107 
    108 	return (biosdiskopen(f, biosdev, partition));
    109 }
    110