118 lines
4.6 KiB
C
118 lines
4.6 KiB
C
/* $NetBSD: dec_boot.h,v 1.8 1999/11/27 01:51:20 simonb Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)dec_boot.h 8.1 (Berkeley) 6/10/93
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*
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* devDiskLabel.h --
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*
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* This defines the disk label that Sun writes on the 0'th sector of
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* the 0'th cylinder of its SMD disks. The disk label contains some
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* geometry information and also the division of the disk into a
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* number of partitions. Each partition is identified to the drive
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* by a different unit number.
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*
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* from: Header: /sprite/src/kernel/dev/RCS/devDiskLabel.h,
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* v 9.4 90/03/01 12:22:36 jhh Exp SPRITE (Berkeley)
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*/
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/*
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* Boot block information on the 0th sector.
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* The boot program is stored in sequences of contiguous blocks.
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* If mode is 0, there is just one sequence of blocks and one Dec_BootMap
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* is used. If mode is 1, there are multiple sequences of blocks
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* and multiple Dec_BootMaps are used, the last with numBlocks = 0.
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*
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* NOTE: The standard disk label offset is 64 which is
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* after the boot information expected by the PROM boot loader.
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*/
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struct boot_map {
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int32_t num_blocks; /* Number of blocks to read. */
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int32_t start_block; /* Starting block on disk. */
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};
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/*
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* This is the structure of a disk or tape boot block. The boot_map
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* can either be a single boot count and start block (contiguous mode)
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* or a list of up to 61 (to fill a 512 byte sector) block count and
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* start block pairs. Under NetBSD, contiguous mode is always used.
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*/
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struct boot_block {
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char pad[8];
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int32_t magic; /* DEC_BOOT_MAGIC */
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int32_t mode; /* Mode for boot info. */
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u_int32_t load_addr; /* Address to start loading. */
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u_int32_t exec_addr; /* Address to start execing. */
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struct boot_map map[61]; /* boot program section(s). */
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};
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#define DEC_BOOT_MAGIC 0x0002757a
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#define DEC_BOOTMODE_CONTIGUOUS 0
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#define DEC_BOOTMODE_SCATTERED 1
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#define BOOT_BLOCK_OFFSET 0
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#define BOOT_BLOCK_BLOCKSIZE 512
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/*
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* DEC_NUM_DISK_PARTS is the number of partitions that are recorded in
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* the label information. The size of the padding in the Dec_DiskLabel
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* type is dependent on this number...
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*/
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#define DEC_NUM_DISK_PARTS 8
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/*
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* A disk is divided into partitions and this type specifies where a
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* partition starts and how many bytes it contains.
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*/
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typedef struct dec_disk_map {
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int32_t num_blocks; /* Number of 512 byte blocks in partition. */
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int32_t start_block; /* Start of partition in blocks. */
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} dec_disk_map;
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/*
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* Label information on the 31st (DEC_LABEL_SECTOR) sector.
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*/
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typedef struct dec_disklabel {
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char pad0[440]; /* DIFFERENT from sprite!!! */
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int32_t magic; /* DEC_LABEL_MAGIC */
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int32_t is_partitioned; /* 1 if disk is partitioned. */
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dec_disk_map map[DEC_NUM_DISK_PARTS]; /* Indicates disk partitions. */
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} dec_disklabel;
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#define DEC_LABEL_MAGIC 0x00032957
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#define DEC_LABEL_SECTOR 31
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