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      1 /*	$NetBSD: devopen.c,v 1.7 2016/06/26 04:17:17 isaki Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Minoura Makoto
      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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/param.h>
     30 #include <sys/disklabel.h>
     31 #include <machine/bootinfo.h>
     32 #include <lib/libkern/libkern.h>
     33 #include <lib/libsa/stand.h>
     34 #include "libx68k.h"
     35 
     36 extern struct devspec devspec[]; /* defined in conf.c */
     37 int devopen_open_dir = 0;
     38 
     39 /*
     40  * Parse a device spec.
     41  *
     42  * [ha@]<dev><unit><part>:<file>
     43  *  ha   - host adaptor ("spc0", "spc1", "mha0")
     44  *  dev  - device name (e.g., "sd")
     45  *  unit - 0-7
     46  *  part - a-p
     47  */
     48 int
     49 devparse(const char *fname, int *ha, int *dev, int *unit, int *part,
     50 	char **file)
     51 {
     52 	char const *s;
     53 	int i;
     54 
     55 	s = fname;
     56 
     57 	if (strncmp(s, "spc0@", 5) == 0) {
     58 		*ha = (X68K_BOOT_SCSIIF_SPC << 4) | 0;
     59 		s += 5;
     60 	} else if (strncmp(s, "spc1@", 5) == 0) {
     61 		*ha = (X68K_BOOT_SCSIIF_SPC << 4) | 1;
     62 		s += 5;
     63 	} else if (strncmp(s, "mha0@", 5) == 0) {
     64 		*ha = (X68K_BOOT_SCSIIF_MHA << 4) | 0;
     65 		s += 5;
     66 	} else {
     67 		*ha = 0;
     68 	}
     69 
     70 	for (i = 0; devspec[i].ds_name != 0; i++) {
     71 		if (strncmp (devspec[i].ds_name, s,
     72 			     strlen(devspec[i].ds_name)) == 0)
     73 			break;
     74 	}
     75 
     76 	if (devspec[i].ds_name == 0)
     77 		return ENODEV;
     78 	s += strlen(devspec[i].ds_name);
     79 	*dev = devspec[i].ds_dev;
     80 
     81 	if (devspec[i].ds_net) {
     82 		*unit = 0;
     83 		*part = 0;
     84 	} else {
     85 		*unit = *s++ - '0';
     86 		if (*unit < 0 || *unit > devspec[i].ds_maxunit)
     87 			/* bad unit */
     88 			return ENODEV;
     89 		*part = *s++ - 'a';
     90 		if (*part < 0 || *part > MAXPARTITIONS)
     91 			/* bad partition */
     92 			return ENODEV;
     93 	}
     94 
     95 	if (*s++ != ':')
     96 		return ENODEV;
     97 
     98 	if (*s == '/') {
     99 		s++;
    100 		if (devopen_open_dir && *s == 0)
    101 			s--;
    102 	}
    103 	*file = __UNCONST(s);
    104 
    105 	return 0;
    106 }
    107 
    108 int
    109 devopen(struct open_file *f, const char *fname, char **file)
    110 {
    111 	int error;
    112 	int ha, dev, unit, part;
    113 	struct devsw *dp = &devsw[0];
    114 
    115 	error = devparse(fname, &ha, &dev, &unit, &part, file);
    116 	if (error)
    117 		return error;
    118 
    119 	dp = &devsw[dev];
    120 
    121 	if (dp->dv_open == NULL)
    122 		return ENODEV;
    123 
    124 	f->f_dev = dp;
    125 
    126 	if ((error = (*dp->dv_open)(f, unit, part)) == 0)
    127 		return 0;
    128 
    129 	return error;
    130 }
    131