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      1 /*	$NetBSD: devopen.c,v 1.2 2012/01/18 23:12:21 nonaka Exp $	*/
      2 
      3 /*-
      4  *  Copyright (c) 1993 John Brezak
      5  *  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. The name of the author may not be used to endorse or promote products
     16  *     derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED.	IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/param.h>
     32 #include <sys/disklabel.h>
     33 
     34 #include "boot.h"
     35 #include "bootinfo.h"
     36 #include "disk.h"
     37 #include "unixdev.h"
     38 
     39 static int dev2bios(char *devname, unsigned int unit, int *biosdev);
     40 static int devlookup(char *d);
     41 
     42 static int
     43 dev2bios(char *devname, unsigned int unit, int *biosdev)
     44 {
     45 
     46 	if (strcmp(devname, devname_hd) == 0) {
     47 		*biosdev = 0x80 + unit;
     48 		return 0;
     49 	} else if (strcmp(devname, devname_mmcd) == 0) {
     50 		*biosdev = 0x00 + unit;
     51 		return 0;
     52 	}
     53 	return ENXIO;
     54 }
     55 
     56 static int
     57 devlookup(char *d)
     58 {
     59 	struct devsw *dp = devsw;
     60 	int i;
     61 
     62 	for (i = 0; i < ndevs; i++, dp++) {
     63 		if ((dp->dv_name != NULL) && (strcmp(dp->dv_name, d) == 0)) {
     64 			return i;
     65 		}
     66 	}
     67 
     68 	printf("No such device - Configured devices are:\n");
     69 	for (dp = devsw, i = 0; i < ndevs; i++, dp++) {
     70 		if (dp->dv_name != NULL) {
     71 			printf(" %s", dp->dv_name);
     72 		}
     73 	}
     74 	printf("\n");
     75 	return -1;
     76 }
     77 
     78 int
     79 devopen(struct open_file *f, const char *fname, char **file)
     80 {
     81 	struct devsw *dp;
     82 	char *fsname, *devname;
     83 	u_int dev, unit, partition;
     84 	int biosdev;
     85 	int error;
     86 
     87 #if defined(UNIX_DEBUG)
     88 	printf("devopen: fname = %s\n", fname ? fname : "(null)");
     89 #endif
     90 
     91 	if ((error = parsebootfile(fname, &fsname, &devname, &unit, &partition,
     92 	    (const char **)file)) != 0) {
     93 		return error;
     94 	}
     95 
     96 #if defined(UNIX_DEBUG)
     97 	printf("devopen: devname = %s\n", devname);
     98 #endif
     99 	dev = devlookup(devname);
    100 	if (dev == -1) {
    101 #if defined(UNIX_DEBUG)
    102 		printf("devopen: devlookup failed\n");
    103 #endif
    104 		return ENXIO;
    105 	}
    106 
    107 	dp = &devsw[dev];
    108 	if (dp->dv_open == NULL) {
    109 #if defined(UNIX_DEBUG)
    110 		printf("devopen: dev->dv_open() == NULL\n");
    111 #endif
    112 		return ENODEV;
    113 	}
    114 	f->f_dev = dp;
    115 
    116 	if (dev2bios(devname, unit, &biosdev) == 0) {
    117 #if defined(UNIX_DEBUG)
    118 		printf("devopen: bios disk\n");
    119 #endif
    120 		return unixopen(f, devname, unit, partition, *file);
    121 	}
    122 
    123 #if defined(UNIX_DEBUG)
    124 	printf("devopen: dev->dv_open()\n");
    125 #endif
    126 	if ((error = (*dp->dv_open)(f, devname, unit, partition, *file)) == 0) {
    127 #if defined(UNIX_DEBUG)
    128 		printf("devopen: dev->dv_open() opened\n");
    129 #endif
    130 		return 0;
    131 	}
    132 
    133 	printf("%s%d%c:%s : %s\n", dp->dv_name, unit, partition + 'a', *file,
    134 	    strerror(error));
    135 	return error;
    136 }
    137