Functions to encode and decode Sun Microsystems disk partitioning data
structures. Mostly by: jake
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131
sys/geom/geom_sunlabel_enc.c
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131
sys/geom/geom_sunlabel_enc.c
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/*-
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* Copyright (c) 2003 Jake Burkholder
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* Copyright (c) 2003 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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* Functions to encode or decode struct sun_disklabel into a bytestream
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* of correct endianess and packing.
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*
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* NB! This file must be usable both in kernel and userland.
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*
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*/
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#include <sys/types.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/sun_disklabel.h>
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#define SL_TEXT 0x0
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#define SL_TEXT_SIZEOF 0x80
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#define SL_RPM 0x1a4
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#define SL_PCYLINDERS 0x1a6
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#define SL_SPARESPERCYL 0x1a8
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#define SL_INTERLEAVE 0x1ae
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#define SL_NCYLINDERS 0x1b0
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#define SL_ACYLINDERS 0x1b2
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#define SL_NTRACKS 0x1b4
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#define SL_NSECTORS 0x1b6
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#define SL_PART 0x1bc
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#define SL_MAGIC 0x1fc
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#define SL_CKSUM 0x1fe
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#define SL_LENGTH 0x200
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#define SL_NPART 0x8
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#define SDKP_CYLOFFSET 0
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#define SDKP_NSECTORS 0x4
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#define SDKP_SIZEOF 0x8
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/*
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* Decode the relevant fields of a sun disk label, and return zero if the
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* magic and checksum works out OK.
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*/
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int
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sunlabel_dec(void const *pp, struct sun_disklabel *sl)
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{
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const uint8_t *p;
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size_t i;
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u_int u;
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p = pp;
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for (i = 0; i < sizeof(sl->sl_text); i++)
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sl->sl_text[i] = p[SL_TEXT + i];
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sl->sl_rpm = be16dec(p + SL_RPM);
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sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
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sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
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sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
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sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
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sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
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sl->sl_ntracks = be16dec(p + SL_NTRACKS);
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sl->sl_nsectors = be16dec(p + SL_NSECTORS);
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for (i = 0; i < SL_NPART; i++) {
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sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
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(i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
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sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
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(i * SDKP_SIZEOF) + SDKP_NSECTORS);
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}
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sl->sl_magic = be16dec(p + SL_MAGIC);
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for (i = u = 0; i < SL_LENGTH; i += 2)
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u ^= be16dec(p + i);
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if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
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return (0);
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else
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return (EINVAL);
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}
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/*
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* Encode the relevant fields into a sun disklabel, compute new checksum.
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*/
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void
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sunlabel_enc(void *pp, struct sun_disklabel *sl)
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{
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uint8_t *p;
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size_t i;
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u_int u;
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p = pp;
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for (i = 0; i < SL_TEXT_SIZEOF; i++)
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p[SL_TEXT + i] = sl->sl_text[i];
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be16enc(p + SL_RPM, sl->sl_rpm);
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be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
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be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
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be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
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be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
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be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
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be16enc(p + SL_NTRACKS, sl->sl_ntracks);
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be16enc(p + SL_NSECTORS, sl->sl_nsectors);
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for (i = 0; i < SL_NPART; i++) {
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be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
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sl->sl_part[i].sdkp_cyloffset);
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be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
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sl->sl_part[i].sdkp_nsectors);
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}
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be16enc(p + SL_MAGIC, sl->sl_magic);
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for (i = u = 0; i < SL_LENGTH; i += 2)
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u ^= be16dec(p + i);
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be16enc(p + SL_CKSUM, u);
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}
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