2 * Copyright (c) 2008 Marius Strobl <marius@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <geom/geom_disk.h>
32 #include <machine/md_var.h>
35 sparc64_ata_disk_firmware_geom_adjust(struct disk *disk)
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.
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;