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devopen.c revision 1.3 
      1 /*	$NetBSD: devopen.c,v 1.3 2005/06/15 19:01:19 junyoung 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 int dev2bios(char *, u_int, int *);
     45 
     46 static int
     47 dev2bios(char *devname, u_int unit, int *biosdev)
     48 {
     49 	if (strcmp(devname, "hd") == 0)
     50 		*biosdev = 0x80 + unit;
     51 	else if (strcmp(devname, "fd") == 0)
     52 		*biosdev = 0x00 + unit;
     53 	else
     54 		return ENXIO;
     55 
     56 	return 0;
     57 }
     58 
     59 int
     60 bios2dev(int biosdev, char **devname, u_int *unit, u_int sector, u_int *ptnp)
     61 {
     62 	if (biosdev & 0x80)
     63 		*devname = "hd";
     64 	else
     65 		*devname = "fd";
     66 
     67 	*unit = biosdev & 0x7f;
     68 	*ptnp = biosdiskfindptn(biosdev, sector);
     69 
     70 	return 0;
     71 }
     72 
     73 #ifdef _STANDALONE
     74 struct btinfo_bootpath bibp;
     75 #endif
     76 
     77 /*
     78  * Open the BIOS disk device
     79  */
     80 int
     81 devopen(struct open_file *f, const char *fname, char **file)
     82 {
     83 	char *fsname, *devname;
     84 	u_int unit, partition;
     85 	int biosdev;
     86 	int error;
     87 
     88 	if ((error = parsebootfile(fname, &fsname, &devname,
     89 				   &unit, &partition, (const char **) file))
     90 	    || (error = dev2bios(devname, unit, &biosdev)))
     91 		return error;
     92 
     93 	f->f_dev = &devsw[0];		/* must be biosdisk */
     94 
     95 #ifdef _STANDALONE
     96 	strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
     97 	BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
     98 #endif
     99 
    100 	return biosdiskopen(f, biosdev, partition);
    101 }
    102