1/*-
2 * Copyright (c) 2008 Marius Strobl <marius@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <geom/geom_disk.h>
32#include <machine/md_var.h>
33
34void
35sparc64_ata_disk_firmware_geom_adjust(struct disk *disk)
36{
37
38	/*
39	 * The VTOC8 disk label only uses 16-bit fields for cylinders, heads
40	 * and sectors so the geometry of large disks has to be adjusted.
41	 * If the disk is > 32GB at 16 heads and 63 sectors, adjust to 255
42	 * sectors (this matches what the OpenSolaris dad(7D) driver does).
43	 * If the disk is even > 128GB, additionally adjust the heads to
44	 * 255.  This allows disks up to the 2TB limit of the extended VTOC8.
45	 * XXX the OpenSolaris dad(7D) driver limits the mediasize to 128GB.
46	 */
47	if (disk->d_mediasize > (off_t)65535 * 16 * 63 * disk->d_sectorsize)
48		disk->d_fwsectors = 255;
49	if (disk->d_mediasize > (off_t)65535 * 16 * 255 * disk->d_sectorsize)
50		disk->d_fwheads = 255;
51}
52