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dev_tape.c revision 1.4.8.1 
      1 /*	$NetBSD: dev_tape.c,v 1.4.8.1 2009/01/19 13:17:01 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * This module implements a "raw device" interface suitable for
     34  * use by the stand-alone I/O library UFS file-system code, and
     35  * possibly for direct access (i.e. boot from tape).
     36  *
     37  * The implementation is deceptively simple because it uses the
     38  * drivers provided by the Sun PROM monitor.  Note that only the
     39  * PROM driver used to load the boot program is available here.
     40  */
     41 
     42 #include <sys/types.h>
     43 #include <machine/mon.h>
     44 #include <machine/stdarg.h>
     45 #include <stand.h>
     46 
     47 #include "libsa.h"
     48 #include "dvma.h"
     49 #include "saio.h"
     50 #include "dev_tape.h"
     51 
     52 extern int debug;
     53 
     54 struct saioreq tape_ioreq;
     55 
     56 /*
     57  * This is a special version of devopen() for tape boot.
     58  * In this version, the file name is a numeric string of
     59  * one digit, which is passed to the device open so it
     60  * can open the appropriate tape segment.
     61  */
     62 int
     63 devopen(struct open_file *f, const char *fname,	char **file)
     64 {
     65 	struct devsw *dp;
     66 
     67 	*file = (char *)fname;
     68 	dp = &devsw[0];
     69 	f->f_dev = dp;
     70 
     71 	/* The following will call tape_open() */
     72 	return (dp->dv_open(f, fname));
     73 }
     74 
     75 int
     76 tape_open(struct open_file *f, ...)
     77 {
     78 	struct bootparam *bp;
     79 	struct saioreq *si;
     80 	int error, part;
     81 	char *fname;		/* partition number, i.e. "1" */
     82 	va_list ap;
     83 
     84 	va_start(ap, f);
     85 	fname = va_arg(ap, char *);
     86 #ifdef DEBUG
     87 	printf("tape_open: part=%s\n", fname);
     88 #endif
     89 	va_end(ap);
     90 
     91 	/*
     92 	 * Set the tape segment number to the one indicated
     93 	 * by the single digit fname passed in above.
     94 	 */
     95 	if ((fname[0] < '0') && (fname[0] > '9')) {
     96 		return ENOENT;
     97 	}
     98 	part = fname[0] - '0';
     99 
    100 	/*
    101 	 * Setup our part of the saioreq.
    102 	 * (determines what gets opened)
    103 	 */
    104 	si = &tape_ioreq;
    105 	memset(si, 0, sizeof(*si));
    106 
    107 	bp = *romVectorPtr->bootParam;
    108 	si->si_boottab = bp->bootDevice;
    109 	si->si_ctlr = bp->ctlrNum;
    110 	si->si_unit = bp->unitNum;
    111 	si->si_boff = part; 	/* default = bp->partNum + 1; */
    112 
    113 	error = prom_iopen(si);
    114 
    115 #ifdef DEBUG
    116 	printf("tape_open: prom_iopen returned 0x%x\n", error);
    117 #endif
    118 
    119 	if (!error)
    120 		f->f_devdata = si;
    121 
    122 	return (error);
    123 }
    124 
    125 int
    126 tape_close(struct open_file *f)
    127 {
    128 	struct saioreq *si;
    129 
    130 #ifdef DEBUG
    131 	printf("tape_close: calling prom_iclose\n");
    132 #endif
    133 
    134 	si = f->f_devdata;
    135 	prom_iclose(si);
    136 	f->f_devdata = NULL;
    137 	return 0;
    138 }
    139 
    140 int
    141 tape_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf,
    142     size_t *rsize)
    143 {
    144 	struct saioreq *si;
    145 	struct boottab *ops;
    146 	char *dmabuf;
    147 	int	si_flag, xcnt;
    148 
    149 	si = devdata;
    150 	ops = si->si_boottab;
    151 
    152 #ifdef DEBUG
    153 	if (debug > 1)
    154 		printf("tape_strategy: size=%d dblk=%d\n", size, dblk);
    155 #endif
    156 
    157 	dmabuf = dvma_mapin(buf, size);
    158 
    159 	si->si_bn = dblk;
    160 	si->si_ma = dmabuf;
    161 	si->si_cc = size;
    162 
    163 	si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE;
    164 	xcnt = (*ops->b_strategy)(si, si_flag);
    165 	dvma_mapout(dmabuf, size);
    166 
    167 #ifdef DEBUG
    168 	if (debug > 1)
    169 		printf("tape_strategy: xcnt = %x\n", xcnt);
    170 #endif
    171 
    172 	/* At end of tape, xcnt == 0 (not an error) */
    173 	if (xcnt < 0)
    174 		return (EIO);
    175 
    176 	*rsize = xcnt;
    177 	return (0);
    178 }
    179 
    180 int
    181 tape_ioctl(struct open_file *f, u_long cmd, void *data)
    182 {
    183 	return EIO;
    184 }
    185 
    186