132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/*-
|
|
* Copyright (c) 2003 Jake Burkholder
|
|
* Copyright (c) 2003 Poul-Henning Kamp
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
* Functions to encode or decode struct sun_disklabel into a bytestream
|
|
* of correct endianess and packing.
|
|
*
|
|
* NB! This file must be usable both in kernel and userland.
|
|
*
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/endian.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/sun_disklabel.h>
|
|
|
|
#define SL_TEXT 0x0
|
|
#define SL_TEXT_SIZEOF 0x80
|
|
#define SL_RPM 0x1a4
|
|
#define SL_PCYLINDERS 0x1a6
|
|
#define SL_SPARESPERCYL 0x1a8
|
|
#define SL_INTERLEAVE 0x1ae
|
|
#define SL_NCYLINDERS 0x1b0
|
|
#define SL_ACYLINDERS 0x1b2
|
|
#define SL_NTRACKS 0x1b4
|
|
#define SL_NSECTORS 0x1b6
|
|
#define SL_PART 0x1bc
|
|
#define SL_MAGIC 0x1fc
|
|
#define SL_CKSUM 0x1fe
|
|
|
|
#define SL_LENGTH 0x200
|
|
|
|
#define SL_NPART 0x8
|
|
|
|
#define SDKP_CYLOFFSET 0
|
|
#define SDKP_NSECTORS 0x4
|
|
#define SDKP_SIZEOF 0x8
|
|
|
|
/*
|
|
* Decode the relevant fields of a sun disk label, and return zero if the
|
|
* magic and checksum works out OK.
|
|
*/
|
|
int
|
|
sunlabel_dec(void const *pp, struct sun_disklabel *sl)
|
|
{
|
|
const uint8_t *p;
|
|
size_t i;
|
|
u_int u;
|
|
|
|
p = pp;
|
|
for (i = 0; i < sizeof(sl->sl_text); i++)
|
|
sl->sl_text[i] = p[SL_TEXT + i];
|
|
sl->sl_rpm = be16dec(p + SL_RPM);
|
|
sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
|
|
sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
|
|
sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
|
|
sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
|
|
sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
|
|
sl->sl_ntracks = be16dec(p + SL_NTRACKS);
|
|
sl->sl_nsectors = be16dec(p + SL_NSECTORS);
|
|
for (i = 0; i < SL_NPART; i++) {
|
|
sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
|
|
(i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
|
|
sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
|
|
(i * SDKP_SIZEOF) + SDKP_NSECTORS);
|
|
}
|
|
sl->sl_magic = be16dec(p + SL_MAGIC);
|
|
for (i = u = 0; i < SL_LENGTH; i += 2)
|
|
u ^= be16dec(p + i);
|
|
if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
|
|
return (0);
|
|
else
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Encode the relevant fields into a sun disklabel, compute new checksum.
|
|
*/
|
|
void
|
|
sunlabel_enc(void *pp, struct sun_disklabel *sl)
|
|
{
|
|
uint8_t *p;
|
|
size_t i;
|
|
u_int u;
|
|
|
|
p = pp;
|
|
for (i = 0; i < SL_TEXT_SIZEOF; i++)
|
|
p[SL_TEXT + i] = sl->sl_text[i];
|
|
be16enc(p + SL_RPM, sl->sl_rpm);
|
|
be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
|
|
be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
|
|
be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
|
|
be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
|
|
be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
|
|
be16enc(p + SL_NTRACKS, sl->sl_ntracks);
|
|
be16enc(p + SL_NSECTORS, sl->sl_nsectors);
|
|
for (i = 0; i < SL_NPART; i++) {
|
|
be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
|
|
sl->sl_part[i].sdkp_cyloffset);
|
|
be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
|
|
sl->sl_part[i].sdkp_nsectors);
|
|
}
|
|
be16enc(p + SL_MAGIC, sl->sl_magic);
|
|
for (i = u = 0; i < SL_LENGTH; i += 2)
|
|
u ^= be16dec(p + i);
|
|
be16enc(p + SL_CKSUM, u);
|
|
}
|