1 /* $NetBSD: bootfs.c,v 1.5 2019/01/09 03:28:31 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by UCHIYAMA Yasushi.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <lib/libsa/stand.h>
33 #include <lib/libkern/libkern.h>
34
35 #include <sys/param.h>
36 #include <machine/bfs.h>
37 #include <machine/sector.h>
38
39 #include "local.h"
40
41 /* System V bfs */
42
43 FS_DEF(bfs);
44
45 struct fs_ops bfs_ops = {
46 bfs_open, bfs_close, bfs_read, bfs_write, bfs_seek, bfs_stat
47 };
48
49 struct bfs_file {
50 struct bfs *bfs;
51 int start, end;
52 size_t size;
53 int cur;
54 uint8_t buf[DEV_BSIZE];
55 };
56
57 int
bfs_open(const char * name,struct open_file * f)58 bfs_open(const char *name, struct open_file *f)
59 {
60 struct bfs_file *file;
61
62 if ((file = alloc(sizeof *file)) == 0)
63 return -1;
64 memset(file, 0, sizeof *file);
65
66 if (bfs_init(&file->bfs) != 0) {
67 dealloc(file, sizeof *file);
68 return -2;
69 }
70
71 if (!bfs_file_lookup(file->bfs, name, &file->start, &file->end,
72 &file->size)) {
73 bfs_fini(file->bfs);
74 dealloc(file, sizeof *file);
75 return -3;
76 }
77
78 printf("%s: %s %d %d %d\n", __func__, name, file->start,
79 file->end, file->size);
80
81 f->f_fsdata = file;
82
83 return 0;
84 }
85
86 int
bfs_close(struct open_file * f)87 bfs_close(struct open_file *f)
88 {
89 struct bfs_file *file = f->f_fsdata;
90
91 bfs_fini(file->bfs);
92
93 return 0;
94 }
95
96 int
bfs_read(struct open_file * f,void * buf,size_t size,size_t * resid)97 bfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
98 {
99 struct bfs_file *file = f->f_fsdata;
100 int n, start, end;
101 uint8_t *p = buf;
102 size_t bufsz = size;
103 int cur = file->cur;
104
105 if (cur + size > file->size)
106 size = file->size - cur;
107
108 start = file->start + (cur >> DEV_BSHIFT);
109 end = file->start + ((cur + size) >> DEV_BSHIFT);
110
111 /* first sector */
112 if (!sector_read(0, file->buf, start))
113 return -2;
114 n = TRUNC_SECTOR(cur) + DEV_BSIZE - cur;
115 if (n >= size) {
116 memcpy(p, file->buf + DEV_BSIZE - n, size);
117 goto done;
118 }
119 memcpy(p, file->buf + DEV_BSIZE - n, n);
120 p += n;
121
122 if ((end - start - 1) > 0) {
123 if (!sector_read_n(0, p, start + 1, end - start - 1))
124 return -2;
125 p += (end - start - 1) * DEV_BSIZE;
126 }
127
128 /* last sector */
129 if (!sector_read(0, file->buf, end))
130 return -2;
131 n = cur + size - TRUNC_SECTOR(cur + size);
132 memcpy(p, file->buf, n);
133
134 done:
135 file->cur += size;
136
137 if (resid)
138 *resid = bufsz - size;
139
140 return 0;
141 }
142
143 int
bfs_write(struct open_file * f,void * start,size_t size,size_t * resid)144 bfs_write(struct open_file *f, void *start, size_t size, size_t *resid)
145 {
146
147 return -1;
148 }
149
150 off_t
bfs_seek(struct open_file * f,off_t offset,int where)151 bfs_seek(struct open_file *f, off_t offset, int where)
152 {
153 struct bfs_file *file = f->f_fsdata;
154 int cur;
155
156 switch (where) {
157 case SEEK_SET:
158 cur = offset;
159 break;
160 case SEEK_CUR:
161 cur = file->cur + offset;
162 break;
163 case SEEK_END:
164 cur = file->size + offset;
165 break;
166 default:
167 return EINVAL;
168 }
169
170 if (cur < 0 || cur >= file->size) {
171 return EINVAL;
172 }
173
174 file->cur = cur;
175
176 return (off_t)cur;
177 }
178
179 int
bfs_stat(struct open_file * f,struct stat * stat)180 bfs_stat(struct open_file *f, struct stat *stat)
181 {
182 struct bfs_file *file = f->f_fsdata;
183
184 stat->st_size = file->size;
185
186 return 0;
187 }
188