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      1 /*	$NetBSD: devopen.c,v 1.11 2012/12/19 13:53:47 kiyohara 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 <lib/libsa/stand.h>
     32 #include <lib/libkern/libkern.h>
     33 #include <sys/param.h>
     34 #include <sys/reboot.h>
     35 
     36 static int devparse(const char *, int *, int *, int *, int *, int *, char **);
     37 
     38 
     39 /*
     40  * Parse a device spec.
     41  *   i.e.
     42  *     /dev/disk/floppy
     43  *     /dev/disk/ide/0/master/0_n
     44  *     /dev/disk/ide/0/slave/0_n
     45  *     /dev/disk/scsi/000/0_n
     46  *     /dev/disk/scsi/030/0_n
     47  */
     48 static int
     49 devparse(const char *fname, int *dev, int *ctlr, int *unit, int *lunit,
     50 	 int *part, char **file)
     51 {
     52 	int i;
     53 	char devdir[] = "/dev/disk/";
     54 	char floppy[] = "floppy";
     55 	char ide[] = "ide";
     56 	char scsi[] = "scsi";
     57 	char *p;
     58 
     59 	if (strncmp(fname, devdir, strlen(devdir)) != 0)
     60 		return EINVAL;
     61 	p = __UNCONST(fname) + strlen(devdir);
     62 
     63 	if (strncmp(p, floppy, strlen(floppy)) == 0) {
     64 		p += strlen(floppy);
     65 		for (i = 0; devsw[i].dv_name != NULL; i++)
     66 			if (strcmp(devsw[i].dv_name, "fd") == 0) {
     67 				*dev = i;
     68 				*ctlr = 0;
     69 				*unit = 1;
     70 				*lunit = 0;
     71 				break;
     72 			}
     73 	} else if (strncmp(p, ide, strlen(ide)) == 0) {
     74 		char master[] = "master";
     75 		char slave[] = "slave";
     76 
     77 		p += strlen(ide);
     78 		if (*p++ != '/' ||
     79 		    !isdigit(*p++) ||
     80 		    *p++ != '/')
     81 			return EINVAL;
     82 		*ctlr = *(p - 2) - '0';
     83 		if (strncmp(p, master, strlen(master)) == 0) {
     84 			*unit = 0;
     85 			p += strlen(master);
     86 		} else if (strncmp(p, slave, strlen(slave)) == 0) {
     87 			*unit = 1;
     88 			p += strlen(slave);
     89 		} else
     90 			return EINVAL;
     91 		if (*p++ != '/' ||
     92 		    !isdigit(*p++) ||
     93 		    *p++ != '_' ||
     94 		    !isdigit(*p++))
     95 			return EINVAL;
     96 		*lunit = *(p - 3) - '0';
     97 		*part = *(p - 1) - '0';
     98 		for (i = 0; devsw[i].dv_name != NULL; i++)
     99 			if (strcmp(devsw[i].dv_name, "wd") == 0) {
    100 				*dev = i;
    101 				break;
    102 			}
    103 		if (devsw[i].dv_name == NULL)
    104 			return EINVAL;
    105 	} else if (strncmp(p, scsi, strlen(scsi)) == 0) {
    106 		p += strlen(scsi);
    107 		if (*p++ != '/' ||
    108 		    !isdigit(*p++) ||
    109 		    !isdigit(*p++) ||
    110 		    !isdigit(*p++) ||
    111 		    *p++ != '/' ||
    112 		    !isdigit(*p++) ||
    113 		    *p++ != '_' ||
    114 		    !isdigit(*p++))
    115 			return EINVAL;
    116 		*ctlr = *(p - 7) - '0';
    117 		*unit = *(p - 6) - '0';
    118 		*lunit = *(p - 5) - '0';
    119 		*part = *(p - 1) - '0';
    120 		for (i = 0; devsw[i].dv_name != NULL; i++)
    121 			if (strcmp(devsw[i].dv_name, "sd") == 0) {
    122 				*dev = i;
    123 				break;
    124 			}
    125 		if (devsw[i].dv_name == NULL)
    126 			return EINVAL;
    127 	}
    128 
    129 	if (*p++ != ':')
    130 		return EINVAL;
    131 	*file = p;
    132 	return 0;
    133 }
    134 
    135 int
    136 devopen(struct open_file *f, const char *fname, char **file)
    137 {
    138 	int error;
    139 	int dev = 0, ctlr = 0, unit = 0, lunit = 0, part = 0;
    140 	struct devsw *dp = &devsw[0];
    141 	extern struct devsw pseudo_devsw;
    142 
    143 	**file = '\0';
    144 	error = devparse(fname, &dev, &ctlr, &unit, &lunit, &part, file);
    145 	if (error == 0) {
    146 		dp = &devsw[dev];
    147 		if (!dp->dv_open)
    148 			return ENODEV;
    149 	} else {
    150 		if (strcmp(fname, "in") == 0)
    151 			/* special case: kernel in memory */
    152 			dp = &pseudo_devsw;
    153 		else
    154 			return error;
    155 	}
    156 
    157 	f->f_dev = dp;
    158 	if ((error = (*dp->dv_open)(f, ctlr, unit, lunit, part)) == 0)
    159 		return 0;
    160 
    161 	printf("%s %s\n", fname, strerror(error));
    162 
    163 	return error;
    164 }
    165