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/* $NetBSD: dev_tape.c,v 1.13 2014/03/30 15:20:54 christos Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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 <lib/libkern/libkern.h>
#include <lib/libsa/stand.h>
#include "libsa.h"
#include "dev_tape.h"
extern int debug;
struct mvmeprom_dskio tape_ioreq;
static int hackprom_diskrd(struct mvmeprom_dskio *);
/*
* 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(struct open_file *f, const char *fname, char **file)
{
struct devsw *dp;
*file = (char *)fname;
dp = &devsw[0];
f->f_dev = dp;
/* The following will call tape_open() */
return dp->dv_open(f, fname);
}
int
tape_open(struct open_file *f, ...)
{
char *fname; /* partition number, i.e. "1" */
int part;
struct mvmeprom_dskio *ti;
va_list ap;
va_start(ap, f);
fname = va_arg(ap, char *);
va_end(ap);
/*
* 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';
/*
* Setup our part of the saioreq.
* (determines what gets opened)
*/
ti = &tape_ioreq;
memset((void *)ti, 0, 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(struct open_file *f)
{
f->f_devdata = NULL;
return 0;
}
#define MVMEPROM_SCALE (512/MVMEPROM_BLOCK_SIZE)
int
tape_strategy(void *devdata, int flag, daddr_t dblk, u_int size, void *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);
/* work around for stupid '147 prom bug */
if (bugargs.cputyp == 0x147)
ret = hackprom_diskrd(ti);
else
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(struct open_file *f, u_long cmd, void *data)
{
return EIO;
}
static int
hackprom_diskrd(struct mvmeprom_dskio *ti)
{
static int blkoffset = 0;
#define hackload_addr ((char *)0x080000) /* Load tape segment here */
#define hackload_blocks 0x3000 /* 3Mb worth */
if ((ti->flag & IGNORE_FILENUM) == 0) {
/*
* First time through. Load the whole tape segment...
*/
struct mvmeprom_dskio nti;
int ret;
nti = *ti;
nti.pbuffer = hackload_addr;
nti.blk_cnt = hackload_blocks;
nti.flag |= END_OF_FILE;
ret = mvmeprom_diskrd(&nti);
/*
* PROM returns 1 on end-of-file. This isn't an
* error in this instance, just in case you're wondering! ;-)
*/
if (ret < 0 || ret > 1)
return ret;
blkoffset = 0;
}
/*
* Grab the required number of block(s)
*/
memcpy(ti->pbuffer, &(hackload_addr[blkoffset]),
ti->blk_cnt * MVMEPROM_BLOCK_SIZE);
blkoffset += (ti->blk_cnt * MVMEPROM_BLOCK_SIZE);
return 0;
}
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