cam_machdep.c

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    1 /*-
    2  * Copyright (c) 2011 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 <sys/systm.h>
   32 
   33 #include <cam/cam.h>
   34 #include <cam/cam_ccb.h>
   35 
   36 #include <machine/md_var.h>
   37 
   38 int
   39 scsi_da_bios_params(struct ccb_calc_geometry *ccg)
   40 {
   41         uint32_t secs_per_cylinder, size_mb;
   42 
   43         /*
   44          * The VTOC8 disk label only uses 16-bit fields for cylinders, heads
   45          * and sectors so the geometry of large disks has to be adjusted.
   46          * We generally use the sizing used by cam_calc_geometry(9), except
   47          * when it would overflow the cylinders, in which case we use 255
   48          * heads and sectors.  This allows disks up to the 2TB limit of the
   49          * extended VTOC8.
   50          * XXX this doesn't match the sizing used by OpenSolaris, as that
   51          * would exceed the 8-bit ccg->heads and ccg->secs_per_track.
   52          */
   53         if (ccg->block_size == 0)
   54                 return (0);
   55         size_mb = (1024L * 1024L) / ccg->block_size;
   56         if (size_mb == 0)
   57                 return (0);
   58         size_mb = ccg->volume_size / size_mb;
   59         if (ccg->volume_size > (uint64_t)65535 * 255 * 63) {
   60                 ccg->heads = 255;
   61                 ccg->secs_per_track = 255;
   62         } else if (size_mb > 1024) {
   63                 ccg->heads = 255;
   64                 ccg->secs_per_track = 63;
   65         } else {
   66                 ccg->heads = 64;
   67                 ccg->secs_per_track = 32;
   68         }
   69         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
   70         if (secs_per_cylinder == 0)
   71                 return (0);
   72         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
   73         return (1);
   74 }

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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/cam_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/cam_machdep.c