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      1 /*	$NetBSD: sector.c,v 1.7 2008/04/28 20:23:18 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      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 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: sector.c,v 1.7 2008/04/28 20:23:18 martin Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/buf.h>
     38 #include <machine/sector.h>
     39 
     40 struct sector_rw {
     41 	struct buf *buf;
     42 	void (*strategy)(struct buf *);
     43 	bool busy;
     44 } __context;
     45 
     46 void *
     47 sector_init(dev_t dev, void (*strat)(struct buf *))
     48 {
     49 	struct sector_rw *rw =& __context;
     50 
     51 	if (rw->busy)
     52 		return 0;
     53 	rw->busy = true;
     54 	rw->strategy = strat;
     55 	rw->buf = geteblk(DEV_BSIZE);
     56 	rw->buf->b_dev = dev;
     57 
     58 	return rw;
     59 }
     60 
     61 void
     62 sector_fini(void *self)
     63 {
     64 	struct sector_rw *rw = self;
     65 
     66 	brelse(rw->buf, 0);
     67 	rw->busy = false;
     68 }
     69 
     70 bool
     71 sector_read_n(void *self, uint8_t *buf, daddr_t sector, int count)
     72 {
     73 	int i;
     74 
     75 	for (i = 0; i < count; i++) {
     76 		if (!sector_read(self, buf, sector))
     77 			return false;
     78 		buf += DEV_BSIZE;
     79 		sector++;
     80 	}
     81 
     82 	return true;
     83 }
     84 
     85 bool
     86 sector_read(void *self, uint8_t *buf, daddr_t sector)
     87 {
     88 	struct sector_rw *rw = self;
     89 	struct buf *b = rw->buf;
     90 
     91 	b->b_blkno = sector;
     92 	b->b_cylinder = sector / 100;
     93 	b->b_bcount = DEV_BSIZE;
     94 	b->b_oflags &= ~(BO_DONE);
     95 	b->b_flags |= B_READ;
     96 	rw->strategy(b);
     97 
     98 	if (biowait(b) != 0)
     99 		return false;
    100 
    101 	memcpy(buf, b->b_data, DEV_BSIZE);
    102 
    103 	return true;
    104 }
    105 
    106 bool
    107 sector_write_n(void *self, uint8_t *buf, daddr_t sector, int count)
    108 {
    109 	int i;
    110 
    111 	for (i = 0; i < count; i++) {
    112 		if (!sector_write(self, buf, sector))
    113 			return false;
    114 		buf += DEV_BSIZE;
    115 		sector++;
    116 	}
    117 
    118 	return true;
    119 }
    120 
    121 bool
    122 sector_write(void *self, uint8_t *buf, daddr_t sector)
    123 {
    124 	struct sector_rw *rw = self;
    125 	struct buf *b = rw->buf;
    126 
    127 	b->b_blkno = sector;
    128 	b->b_cylinder = sector / 100;
    129 	b->b_bcount = DEV_BSIZE;
    130 	b->b_flags &= ~(B_READ);
    131 	b->b_oflags &= ~(BO_DONE);
    132 	b->b_flags |= B_WRITE;
    133 	memcpy(b->b_data, buf, DEV_BSIZE);
    134 	rw->strategy(b);
    135 
    136 	if (biowait(b) != 0)
    137 		return false;
    138 
    139 	return true;
    140 }
    141