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/* $OpenBSD: dev_tape.c,v 1.2 2002/03/14 03:15:57 millert Exp $ */
/*
* Copyright (c) 1993 Paul Kranenburg
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* 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.
*/
/*
* This module implements a "raw device" interface suitable for
* use by the stand-alone I/O library UFS file-system code, and
* possibly for direct access (i.e. boot from tape).
*/
#include <sys/types.h>
#include <machine/prom.h>
#include "stand.h"
#include "libsa.h"
struct mvmeprom_dskio tape_ioreq;
/*
* This is a special version of devopen() for tape boot.
* In this version, the file name is a numeric string of
* one digit, which is passed to the device open so it
* can open the appropriate tape segment.
*/
int
devopen(f, fname, file)
struct open_file *f;
const char *fname; /* normally "1" */
char **file;
{
struct devsw *dp;
int errorno;
*file = (char *)fname;
dp = &devsw[0];
f->f_dev = dp;
/* The following will call tape_open() */
errorno = dp->dv_open(f, fname);
return (errorno);
}
int
tape_open(f, fname)
struct open_file *f;
char *fname; /* partition number, i.e. "1" */
{
int error = 0;
int part;
struct mvmeprom_dskio *ti;
/*
* Set the tape segment number to the one indicated
* by the single digit fname passed in above.
*/
if ((fname[0] < '0') && (fname[0] > '9')) {
return ENOENT;
}
part = fname[0] - '0';
fname = NULL;
/*
* Setup our part of the saioreq.
* (determines what gets opened)
*/
ti = &tape_ioreq;
bzero((caddr_t)ti, sizeof(*ti));
ti->ctrl_lun = bugargs.ctrl_lun;
ti->dev_lun = bugargs.dev_lun;
ti->status = 0;
ti->pbuffer = NULL;
ti->blk_num = part;
ti->blk_cnt = 0;
ti->flag = 0;
ti->addr_mod = 0;
f->f_devdata = ti;
return (0);
}
int
tape_close(f)
struct open_file *f;
{
struct mvmeprom_dskio *ti;
ti = f->f_devdata;
f->f_devdata = NULL;
return 0;
}
#define MVMEPROM_SCALE (512/MVMEPROM_BLOCK_SIZE)
int
tape_strategy(devdata, flag, dblk, size, buf, rsize)
void *devdata;
int flag;
daddr_t dblk;
u_int size;
char *buf;
u_int *rsize;
{
struct mvmeprom_dskio *ti;
int ret;
ti = devdata;
if (flag != F_READ)
return(EROFS);
ti->status = 0;
ti->pbuffer = buf;
/* don't change block #, set in open */
ti->blk_cnt = size / (512 / MVMEPROM_SCALE);
ret = mvmeprom_diskrd(ti);
if (ret != 0)
return (EIO);
*rsize = (ti->blk_cnt / MVMEPROM_SCALE) * 512;
ti->flag |= IGNORE_FILENUM; /* ignore next time */
return (0);
}
int
tape_ioctl()
{
return EIO;
}
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