xref: /openbsd-src/sys/arch/alpha/stand/nboot/devopen.c (revision 0eebeeb2dbf36e23abff0d7d1ae8704fee387bdb)
1 /*	$OpenBSD: devopen.c,v 1.1 2023/03/11 20:56:01 miod Exp $	*/
2 
3 /*
4  * Copyright (c) 2023 Miodrag Vallat.
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include "libsa.h"
20 
21 int
devopen(struct open_file * f,const char * fname,char ** file)22 devopen(struct open_file *f, const char *fname, char **file)
23 {
24 	struct devsw *dp;
25 	const char *s;
26 
27 	/*
28 	 * Unfortunately for us, the BOOTDEF_DEV environment variable
29 	 * contents does not match the DKA/DQA/DRA/DVA/MKA/EWA... SRM
30 	 * device names, and we can't convert between them.
31 	 * So we can only boot files from the same device the boot loader
32 	 * was loaded from, and ignore any device specification here.
33 	 */
34 	s = strchr(fname, ':');
35 	if (s != NULL)
36 		*file = (char *)++s;
37 	else
38 		*file = (char *)fname;
39 
40 	dp = &devsw[0];
41 	f->f_dev = dp;
42 	return (*dp->dv_open)(f);
43 }
44