sys/boot/ia64/libski/skifs.c

   1 /*-
   2  * Copyright (c) 2001 Doug Rabson
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/boot/ia64/libski/skifs.c,v 1.2 2003/09/08 09:11:32 obrien Exp $
  27  * $DragonFly: src/sys/boot/ia64/libski/skifs.c,v 1.1 2003/11/10 06:08:37 dillon Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/time.h>
  32 #include <stddef.h>
  33 #include <stand.h>
  34 #include <stdarg.h>
  35
  36 #include "libski.h"
  37
  38 struct disk_req {
  39         unsigned long addr;
  40         unsigned len;
  41 };
  42
  43 struct disk_stat {
  44         int fd;
  45         unsigned count;
  46 };
  47
  48 static int
  49 skifs_open(const char *path, struct open_file *f)
  50 {
  51         int fd;
  52
  53         /*
  54          * Skip leading '/' so that our pretend filesystem starts in
  55          * the current working directory.
  56          */
  57         while (*path == '/')
  58                 path++;
  59
  60         fd = ssc((u_int64_t) path, 1, 0, 0, SSC_OPEN);
  61         if (fd > 0) {
  62                 f->f_fsdata = (void*)(u_int64_t) fd;
  63                 return 0;
  64         }
  65         return ENOENT;
  66 }
  67
  68 static int
  69 skifs_close(struct open_file *f)
  70 {
  71         ssc((u_int64_t) f->f_fsdata, 0, 0, 0, SSC_CLOSE);
  72         return 0;
  73 }
  74
  75 static int
  76 skifs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
  77 {
  78         struct disk_req req;
  79         struct disk_stat stat;
  80
  81         req.len = size;
  82         req.addr = (u_int64_t) buf;
  83         ssc((u_int64_t) f->f_fsdata, 1, (u_int64_t) &req, f->f_offset, SSC_READ);
  84         stat.fd = (u_int64_t) f->f_fsdata;
  85         ssc((u_int64_t)&stat, 0, 0, 0, SSC_WAIT_COMPLETION);
  86
  87         *resid = size - stat.count;
  88         f->f_offset += stat.count;
  89         return 0;
  90 }
  91
  92 static off_t
  93 skifs_seek(struct open_file *f, off_t offset, int where)
  94 {
  95         u_int64_t base;
  96
  97         switch (where) {
  98         case SEEK_SET:
  99                 base = 0;
 100                 break;
 101
 102         case SEEK_CUR:
 103                 base = f->f_offset;
 104                 break;
 105
 106         case SEEK_END:
 107                 printf("can't find end of file in SKI\n");
 108                 base = f->f_offset;
 109                 break;
 110         }
 111
 112         f->f_offset = base + offset;
 113         return base;
 114 }
 115
 116 static int
 117 skifs_stat(struct open_file *f, struct stat *sb)
 118 {
 119         bzero(sb, sizeof(*sb));
 120         sb->st_mode = S_IFREG | S_IRUSR;
 121         return 0;
 122 }
 123
 124 static int
 125 skifs_readdir(struct open_file *f, struct dirent *d)
 126 {
 127         return ENOENT;
 128 }
 129
 130 struct fs_ops ski_fsops = {
 131         "fs",
 132         skifs_open,
 133         skifs_close,
 134         skifs_read,
 135         null_write,
 136         skifs_seek,
 137         skifs_stat,
 138         skifs_readdir
 139 };
 140
 141 static int
 142 skifs_dev_init(void)
 143 {
 144         return 0;
 145 }
 146
 147 /*
 148  * Print information about disks
 149  */
 150 static void
 151 skifs_dev_print(int verbose)
 152 {
 153 }
 154
 155 /*
 156  * Attempt to open the disk described by (dev) for use by (f).
 157  *
 158  * Note that the philosophy here is "give them exactly what
 159  * they ask for".  This is necessary because being too "smart"
 160  * about what the user might want leads to complications.
 161  * (eg. given no slice or partition value, with a disk that is
 162  *  sliced - are they after the first BSD slice, or the DOS
 163  *  slice before it?)
 164  */
 165 static int
 166 skifs_dev_open(struct open_file *f, ...)
 167 {
 168         return 0;
 169 }
 170
 171 static int
 172 skifs_dev_close(struct open_file *f)
 173 {
 174
 175         return 0;
 176 }
 177
 178 static int
 179 skifs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
 180 {
 181         return 0;
 182 }
 183
 184 struct devsw skifs_dev = {
 185         "fs",
 186         DEVT_DISK,
 187         skifs_dev_init,
 188         skifs_dev_strategy,
 189         skifs_dev_open,
 190         skifs_dev_close,
 191         noioctl,
 192         skifs_dev_print
 193 };