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devopen.c revision 1.1 
      1 /*	$NetBSD: devopen.c,v 1.1 2003/04/16 22:36:14 dsl 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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed for the NetBSD Project
     18  *	by Matthias Drochner.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 
     35 #include <sys/types.h>
     36 
     37 #include <lib/libsa/stand.h>
     38 #include <lib/libkern/libkern.h>
     39 
     40 #include <libi386.h>
     41 #include <biosdisk.h>
     42 #include "devopen.h"
     43 #ifdef _STANDALONE
     44 #include <bootinfo.h>
     45 #endif
     46 #ifdef SUPPORT_PS2
     47 #include <biosmca.h>
     48 #endif
     49 
     50 static __inline int dev2bios __P((char *, unsigned int, int *));
     51 
     52 static __inline int
     53 dev2bios(devname, unit, biosdev)
     54 	char           *devname;
     55 	unsigned int    unit;
     56 	int            *biosdev;
     57 {
     58 	if (strcmp(devname, "hd") == 0)
     59 		*biosdev = 0x80 + unit;
     60 	else if (strcmp(devname, "fd") == 0)
     61 		*biosdev = 0x00 + unit;
     62 	else
     63 		return (ENXIO);
     64 
     65 	return (0);
     66 }
     67 
     68 int
     69 bios2dev(int biosdev, char **devname, u_int *unit, u_int sector, u_int *ptnp)
     70 {
     71 	if (biosdev & 0x80)
     72 		*devname = "hd";
     73 	else
     74 		*devname = "fd";
     75 
     76 	*unit = biosdev & 0x7f;
     77 	*ptnp = biosdiskfindptn(biosdev, sector);
     78 
     79 	return 0;
     80 }
     81 
     82 #ifdef _STANDALONE
     83 struct btinfo_bootpath bibp;
     84 #endif
     85 
     86 /*
     87  * Open the BIOS disk device
     88  */
     89 int
     90 devopen(f, fname, file)
     91 	struct open_file *f;
     92 	const char     *fname;
     93 	char          **file;
     94 {
     95 	char           *fsname, *devname;
     96 	unsigned int    unit, partition;
     97 	int             biosdev;
     98 	int             error;
     99 	struct devsw   *dp;
    100 
    101 	if ((error = parsebootfile(fname, &fsname, &devname,
    102 				   &unit, &partition, (const char **) file))
    103 	    || (error = dev2bios(devname, unit, &biosdev)))
    104 		return (error);
    105 
    106 	dp = &devsw[0];		/* must be biosdisk */
    107 	f->f_dev = dp;
    108 
    109 #ifdef _STANDALONE
    110 	strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
    111 	BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
    112 #endif
    113 
    114 	return (biosdiskopen(f, biosdev, partition));
    115 }
    116