1/* $NetBSD: sector.c,v 1.6 2008/01/02 11:48:24 ad 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 1.6 2008/01/02 11:48:24 ad Exp $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/buf.h> 38#include <machine/sector.h> 39 40struct sector_rw { 41 struct buf *buf; 42 void (*strategy)(struct buf *); 43 bool busy; 44} __context; 45 46void * 47sector_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 61void 62sector_fini(void *self) 63{ 64 struct sector_rw *rw = self; 65 66 brelse(rw->buf, 0); 67 rw->busy = false; 68} 69 70bool 71sector_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 85bool 86sector_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 106bool 107sector_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 121bool 122sector_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