diff options
Diffstat (limited to 'sys/arch/mvmeppc/stand/libsa/rawfs.c')
| -rw-r--r-- | sys/arch/mvmeppc/stand/libsa/rawfs.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/sys/arch/mvmeppc/stand/libsa/rawfs.c b/sys/arch/mvmeppc/stand/libsa/rawfs.c new file mode 100644 index 00000000000..3784175b92d --- /dev/null +++ b/sys/arch/mvmeppc/stand/libsa/rawfs.c @@ -0,0 +1,178 @@ +/* $OpenBSD: rawfs.c,v 1.1 2001/06/26 21:58:08 smurph Exp $ */ + +/* + * Copyright (c) 1995 Gordon W. Ross + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * 4. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Gordon W. Ross + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Raw file system - for stream devices like tapes. + * No random access, only sequential read allowed. + * This exists only to allow upper level code to be + * shielded from the fact that the device must be + * read only with whole block position and size. + */ + +#include <sys/param.h> +#include <stand.h> +#include <rawfs.h> + +#define RAWFS_BSIZE 512 + +/* + * In-core open file. + */ +struct cfile { + daddr_t fs_nextblk; /* block number to read next */ + int fs_len; /* amount left in f_buf */ + char * fs_ptr; /* read pointer into f_buf */ + char fs_buf[RAWFS_BSIZE]; +}; + +static int +rawfs_get_block __P((struct open_file *)); + +int rawfs_open(path, f) + char *path; + struct open_file *f; +{ + struct cfile *fs; + + /* + * The actual PROM driver has already been opened. + * Just allocate the I/O buffer, etc. + */ + fs = alloc(sizeof(struct cfile)); + fs->fs_nextblk = 0; + fs->fs_len = 0; + fs->fs_ptr = fs->fs_buf; + + f->f_fsdata = fs; + return (0); +} + +int rawfs_close(f) + struct open_file *f; +{ + struct cfile *fs; + + fs = (struct cfile *) f->f_fsdata; + f->f_fsdata = (void *)0; + + if (fs != (struct cfile *)0) + free(fs, sizeof(*fs)); + + return (0); +} + +int rawfs_read(f, start, size, resid) + struct open_file *f; + void *start; + u_int size; + u_int *resid; +{ + struct cfile *fs = (struct cfile *)f->f_fsdata; + char *addr = start; + int error = 0; + size_t csize; + + while (size != 0) { + + if (fs->fs_len == 0) + if ((error = rawfs_get_block(f)) != 0) + break; + + if (fs->fs_len <= 0) + break; /* EOF */ + + csize = size; + if (csize > fs->fs_len) + csize = fs->fs_len; + + bcopy(fs->fs_ptr, addr, csize); + fs->fs_ptr += csize; + fs->fs_len -= csize; + addr += csize; + size -= csize; + } + if (resid) + *resid = size; + return (error); +} + +int rawfs_write(f, start, size, resid) + struct open_file *f; + void *start; + size_t size; + size_t *resid; /* out */ +{ + return (EROFS); +} + +off_t rawfs_seek(f, offset, where) + struct open_file *f; + off_t offset; + int where; +{ + return (EFTYPE); +} + +int rawfs_stat(f, sb) + struct open_file *f; + struct stat *sb; +{ + return (EFTYPE); +} + + +/* + * Read a block from the underlying stream device + * (In our case, a tape drive.) + */ +static int +rawfs_get_block(f) + struct open_file *f; +{ + struct cfile *fs; + int error, len; + + fs = (struct cfile *)f->f_fsdata; + fs->fs_ptr = fs->fs_buf; + + twiddle(); + error = f->f_dev->dv_strategy(f->f_devdata, F_READ, + fs->fs_nextblk, RAWFS_BSIZE, fs->fs_buf, &len); + + if (!error) { + fs->fs_len = len; + fs->fs_nextblk += (RAWFS_BSIZE / DEV_BSIZE); + } + + return (error); +} + |