ea634df03a
prevents booting from tape in the obvious way.
213 lines
4.9 KiB
C
213 lines
4.9 KiB
C
/* $NetBSD: dev_tape.c,v 1.2 1997/12/17 21:28:02 scw Exp $ */
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/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This module implements a "raw device" interface suitable for
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* use by the stand-alone I/O library UFS file-system code, and
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* possibly for direct access (i.e. boot from tape).
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*/
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#include <sys/types.h>
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#include <machine/prom.h>
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#include "stand.h"
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#include "libsa.h"
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extern int debug;
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struct mvmeprom_dskio tape_ioreq;
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static int hackprom_diskrd(struct mvmeprom_dskio *);
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/*
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* This is a special version of devopen() for tape boot.
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* In this version, the file name is a numeric string of
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* one digit, which is passed to the device open so it
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* can open the appropriate tape segment.
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*/
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int
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devopen(f, fname, file)
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struct open_file *f;
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const char *fname; /* normally "1" */
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char **file;
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{
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struct devsw *dp;
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int error;
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*file = (char*)fname;
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dp = &devsw[0];
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f->f_dev = dp;
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/* The following will call tape_open() */
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return (dp->dv_open(f, fname));
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}
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int
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tape_open(f, fname)
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struct open_file *f;
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char *fname; /* partition number, i.e. "1" */
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{
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int part;
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struct mvmeprom_dskio *ti;
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/*
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* Set the tape segment number to the one indicated
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* by the single digit fname passed in above.
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*/
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if ((fname[0] < '0') && (fname[0] > '9')) {
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return ENOENT;
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}
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part = fname[0] - '0';
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/*
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* Setup our part of the saioreq.
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* (determines what gets opened)
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*/
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ti = &tape_ioreq;
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bzero((caddr_t)ti, sizeof(*ti));
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ti->ctrl_lun = bugargs.ctrl_lun;
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ti->dev_lun = bugargs.dev_lun;
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ti->status = 0;
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ti->pbuffer = NULL;
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ti->blk_num = part;
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ti->blk_cnt = 0;
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ti->flag = 0;
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ti->addr_mod = 0;
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f->f_devdata = ti;
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return (0);
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}
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int
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tape_close(f)
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struct open_file *f;
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{
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struct mvmeprom_dskio *ti;
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ti = f->f_devdata;
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f->f_devdata = NULL;
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return 0;
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}
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#define MVMEPROM_SCALE (512/MVMEPROM_BLOCK_SIZE)
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int
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tape_strategy(devdata, flag, dblk, size, buf, rsize)
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void *devdata;
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int flag;
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daddr_t dblk;
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u_int size;
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char *buf;
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u_int *rsize;
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{
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struct mvmeprom_dskio *ti;
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int ret;
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ti = devdata;
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if (flag != F_READ)
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return(EROFS);
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ti->status = 0;
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ti->pbuffer = buf;
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/* don't change block #, set in open */
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ti->blk_cnt = size / (512 / MVMEPROM_SCALE);
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/* work around for stupid '147 prom bug */
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if ( bugargs.cputyp == 0x147 )
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ret = hackprom_diskrd(ti);
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else
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ret = mvmeprom_diskrd(ti);
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if (ret != 0)
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return (EIO);
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*rsize = (ti->blk_cnt / MVMEPROM_SCALE) * 512;
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ti->flag |= IGNORE_FILENUM; /* ignore next time */
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return (0);
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}
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int
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tape_ioctl()
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{
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return EIO;
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}
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static int
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hackprom_diskrd(struct mvmeprom_dskio *ti)
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{
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static int blkoffset = 0;
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#define hackload_addr ((char *) 0x080000) /* Load tape segment here */
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#define hackload_blocks 0x2000 /* 2Mb worth */
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if ( (ti->flag & IGNORE_FILENUM) == 0 ) {
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/*
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* First time through. Load the whole tape segment...
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*/
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struct mvmeprom_dskio nti;
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int ret;
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nti = *ti;
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nti.pbuffer = hackload_addr;
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nti.blk_cnt = hackload_blocks;
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nti.flag |= END_OF_FILE;
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ret = mvmeprom_diskrd(&nti);
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/*
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* PROM returns 1 on end-of-file. This isn't an
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* error in this instance, just in case you're wondering! ;-)
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*/
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if ( ret < 0 || ret > 1 )
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return ret;
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blkoffset = 0;
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}
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/*
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* Grab the required number of block(s)
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*/
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bcopy(&(hackload_addr[blkoffset]), ti->pbuffer,
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ti->blk_cnt * MVMEPROM_BLOCK_SIZE);
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blkoffset += (ti->blk_cnt * MVMEPROM_BLOCK_SIZE);
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return 0;
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}
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