xref: /netbsd-src/sys/arch/evbmips/stand/sbmips/common/blkdev.c (revision 7991f5a7b8fc83a3d55dc2a1767cca3b84103969)
1*7991f5a7Sandvar /* $NetBSD: blkdev.c,v 1.3 2021/07/24 21:31:33 andvar Exp $ */
2b1431b71Smrg 
3b1431b71Smrg /*
4b1431b71Smrg  * Copyright (c) 1999 Christopher G. Demetriou.  All rights reserved.
5b1431b71Smrg  *
6b1431b71Smrg  * Redistribution and use in source and binary forms, with or without
7b1431b71Smrg  * modification, are permitted provided that the following conditions
8b1431b71Smrg  * are met:
9b1431b71Smrg  * 1. Redistributions of source code must retain the above copyright
10b1431b71Smrg  *    notice, this list of conditions and the following disclaimer.
11b1431b71Smrg  * 2. Redistributions in binary form must reproduce the above copyright
12b1431b71Smrg  *    notice, this list of conditions and the following disclaimer in the
13b1431b71Smrg  *    documentation and/or other materials provided with the distribution.
14b1431b71Smrg  * 3. All advertising materials mentioning features or use of this software
15b1431b71Smrg  *    must display the following acknowledgement:
16b1431b71Smrg  *      This product includes software developed by Christopher G. Demetriou
17b1431b71Smrg  *	for the NetBSD Project.
18b1431b71Smrg  * 4. The name of the author may not be used to endorse or promote products
19b1431b71Smrg  *    derived from this software without specific prior written permission
20b1431b71Smrg  *
21b1431b71Smrg  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22b1431b71Smrg  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23b1431b71Smrg  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24b1431b71Smrg  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25b1431b71Smrg  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26b1431b71Smrg  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27b1431b71Smrg  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28b1431b71Smrg  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29b1431b71Smrg  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30b1431b71Smrg  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31b1431b71Smrg  */
32b1431b71Smrg 
33b1431b71Smrg /*
34b1431b71Smrg  * Copyright (c) 1992, 1993
35b1431b71Smrg  *	The Regents of the University of California.  All rights reserved.
36b1431b71Smrg  *
37b1431b71Smrg  * This code is derived from software contributed to Berkeley by
38b1431b71Smrg  * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
39b1431b71Smrg  *
40b1431b71Smrg  * Redistribution and use in source and binary forms, with or without
41b1431b71Smrg  * modification, are permitted provided that the following conditions
42b1431b71Smrg  * are met:
43b1431b71Smrg  * 1. Redistributions of source code must retain the above copyright
44b1431b71Smrg  *    notice, this list of conditions and the following disclaimer.
45b1431b71Smrg  * 2. Redistributions in binary form must reproduce the above copyright
46b1431b71Smrg  *    notice, this list of conditions and the following disclaimer in the
47b1431b71Smrg  *    documentation and/or other materials provided with the distribution.
48b1431b71Smrg  * 3. Neither the name of the University nor the names of its contributors
49b1431b71Smrg  *    may be used to endorse or promote products derived from this software
50b1431b71Smrg  *    without specific prior written permission.
51b1431b71Smrg  *
52b1431b71Smrg  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53b1431b71Smrg  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54b1431b71Smrg  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55b1431b71Smrg  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56b1431b71Smrg  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57b1431b71Smrg  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58b1431b71Smrg  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59b1431b71Smrg  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60b1431b71Smrg  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61b1431b71Smrg  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62b1431b71Smrg  * SUCH DAMAGE.
63b1431b71Smrg  *
64b1431b71Smrg  *	@(#)rz.c	8.1 (Berkeley) 6/10/93
65b1431b71Smrg  */
66b1431b71Smrg 
67b1431b71Smrg #include <lib/libsa/stand.h>
68b1431b71Smrg #include <lib/libkern/libkern.h>
69b1431b71Smrg 
70b1431b71Smrg #include <sys/param.h>
71b1431b71Smrg #include <sys/disklabel.h>
72b1431b71Smrg 
735edf0f54Smrg #include "stand/sbmips/common/cfe_api.h"
74b1431b71Smrg 
755edf0f54Smrg #include "stand/sbmips/common/common.h"
76b1431b71Smrg #include "blkdev.h"
77b1431b71Smrg 
78b1431b71Smrg /*
79b1431b71Smrg  * If BOOTXX_FS_TYPE is defined, we'll try to find and use the first
80b1431b71Smrg  * partition with that type mentioned in the disklabel, else default to
81b1431b71Smrg  * using block 0.
82b1431b71Smrg  *
83b1431b71Smrg  * The old boot blocks used to look for a file system starting at block
84b1431b71Smrg  * 0.  It's not immediately obvious that change here is necessary or good,
85b1431b71Smrg  * so for now we don't bother looking for the specific type.
86b1431b71Smrg  */
87b1431b71Smrg #undef BOOTXX_FS_TYPE
88b1431b71Smrg 
89b1431b71Smrg int		blkdev_is_open;
90b1431b71Smrg u_int32_t	blkdev_part_offset;
91b1431b71Smrg 
92b1431b71Smrg /*
93b1431b71Smrg  * Since we have only one device, and want to squeeze space, we just
94b1431b71Smrg  * short-circuit devopen() to do the disk open as well.
95b1431b71Smrg  *
96b1431b71Smrg  * Devopen is supposed to decode the string 'fname', open the device,
97b1431b71Smrg  * and make 'file' point to the remaining file name.  Since we don't
98b1431b71Smrg  * do any device munging, we can just set *file to fname.
99b1431b71Smrg  */
100b1431b71Smrg int
devopen(struct open_file * f,const char * fname,char ** file)101b1431b71Smrg devopen(struct open_file *f, const char *fname, char **file)
102b1431b71Smrg 	/* file:	 out */
103b1431b71Smrg {
104b1431b71Smrg #if defined(BOOTXX_FS_TYPE)
105b1431b71Smrg 	int i;
106b1431b71Smrg 	size_t cnt;
107b1431b71Smrg 	char *msg, buf[DEV_BSIZE];
108b1431b71Smrg 	struct disklabel l;
109b1431b71Smrg #endif /* defined(BOOTXX_FS_TYPE) */
110b1431b71Smrg 
111b1431b71Smrg 	if (blkdev_is_open) {
112b1431b71Smrg 		return (EBUSY);
113b1431b71Smrg 	    }
114b1431b71Smrg 
115b1431b71Smrg 	*file = (char *)fname;
116b1431b71Smrg 
117b1431b71Smrg #if 0
118b1431b71Smrg 	f->f_devdata = NULL;			/* no point */
119b1431b71Smrg #endif
120b1431b71Smrg 
121b1431b71Smrg 	/* Try to read disk label and partition table information. */
122b1431b71Smrg 	blkdev_part_offset = 0;
123b1431b71Smrg #if defined(BOOTXX_FS_TYPE)
124b1431b71Smrg 
125b1431b71Smrg 	i = diskstrategy(NULL, F_READ,
126b1431b71Smrg 	    (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
127b1431b71Smrg 	if (i || cnt != DEV_BSIZE) {
128b1431b71Smrg 		return (ENXIO);
129b1431b71Smrg 	}
130b1431b71Smrg 	msg = getdisklabel(buf, &l);
131b1431b71Smrg 	if (msg == NULL) {
132b1431b71Smrg 		/*
133b1431b71Smrg 		 * there's a label.  find the first partition of the
134b1431b71Smrg 		 * type we want and use its offset.  if none are
135b1431b71Smrg 		 * found, we just use offset 0.
136b1431b71Smrg 		 */
137b1431b71Smrg 		for (i = 0; i < l.d_npartitions; i++) {
138b1431b71Smrg 			if (l.d_partitions[i].p_fstype == BOOTXX_FS_TYPE) {
139b1431b71Smrg 				blkdev_part_offset = l.d_partitions[i].p_offset;
140b1431b71Smrg 				break;
141b1431b71Smrg 			}
142b1431b71Smrg 		}
143b1431b71Smrg 	} else {
144b1431b71Smrg 		/* just use offset 0; it's already set that way */
145b1431b71Smrg 	}
146b1431b71Smrg #endif /* defined(BOOTXX_FS_TYPE) */
147b1431b71Smrg 
148b1431b71Smrg 	blkdev_is_open = 1;
149b1431b71Smrg 	return (0);
150b1431b71Smrg }
151b1431b71Smrg 
152b1431b71Smrg int
blkdevstrategy(void * devdata,int rw,daddr_t bn,size_t reqcnt,void * addrvoid,size_t * cnt)153b1431b71Smrg blkdevstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addrvoid, size_t *cnt)
154*7991f5a7Sandvar 	/* cnt:	 out: number of bytes transferred */
155b1431b71Smrg {
156b1431b71Smrg 	unsigned char *addr = addrvoid;
157b1431b71Smrg 	int res;
158b1431b71Smrg 
159b1431b71Smrg #if !defined(LIBSA_NO_TWIDDLE)
160b1431b71Smrg 	twiddle();
161b1431b71Smrg #endif
162b1431b71Smrg 
163b1431b71Smrg 	/* Partial-block transfers not handled. */
164b1431b71Smrg 	if (reqcnt & (DEV_BSIZE - 1)) {
165b1431b71Smrg 		*cnt = 0;
166b1431b71Smrg 		return (EINVAL);
167b1431b71Smrg 	}
168b1431b71Smrg 	res = cfe_readblk(booted_dev_fd,(bn+blkdev_part_offset)*DEV_BSIZE,addr,reqcnt);
169b1431b71Smrg 	if (res < 0) return EIO;
170b1431b71Smrg 
171b1431b71Smrg 	*cnt = res;
172b1431b71Smrg 	return (0);
173b1431b71Smrg }
174b1431b71Smrg 
175b1431b71Smrg #if !defined(LIBSA_NO_FS_CLOSE)
176b1431b71Smrg int
blkdevclose(struct open_file * f)177b1431b71Smrg blkdevclose(struct open_file *f)
178b1431b71Smrg {
179b1431b71Smrg 
180b1431b71Smrg 	blkdev_is_open = 0;
181b1431b71Smrg 	return (0);
182b1431b71Smrg }
183b1431b71Smrg #endif /* !defined(LIBSA_NO_FS_CLOSE) */
184