| 1 | /* |
| 2 | * Copyright (c) 1992 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Ralph Campbell. |
| 7 | * |
| 8 | * %sccs.include.redist.c% |
| 9 | * |
| 10 | * @(#)dec_boot.h 7.2 (Berkeley) %G% |
| 11 | * |
| 12 | * devDiskLabel.h -- |
| 13 | * |
| 14 | * This defines the disk label that Sun writes on the 0'th sector of |
| 15 | * the 0'th cylinder of its SMD disks. The disk label contains some |
| 16 | * geometry information and also the division of the disk into a |
| 17 | * number of partitions. Each partition is identified to the drive |
| 18 | * by a different unit number. |
| 19 | * |
| 20 | * from: $Header: /sprite/src/kernel/dev/RCS/devDiskLabel.h, |
| 21 | * v 9.4 90/03/01 12:22:36 jhh Exp $ SPRITE (Berkeley) |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Boot block information on the 0th sector. |
| 26 | * The boot program is stored in sequences of contiguous blocks. |
| 27 | * If mode is 0, there is just one sequence of blocks and one Dec_BootMap |
| 28 | * is used. If mode is 1, there are multiple sequences of blocks |
| 29 | * and multiple Dec_BootMaps are used, the last with numBlocks = 0. |
| 30 | * |
| 31 | * NOTE: The standard disk label offset is 64 which is |
| 32 | * after the boot information expected by the PROM boot loader. |
| 33 | */ |
| 34 | |
| 35 | struct Dec_BootMap { |
| 36 | int numBlocks; /* Number of blocks to read. */ |
| 37 | int startBlock; /* Starting block on disk. */ |
| 38 | }; |
| 39 | |
| 40 | struct Dec_DiskBoot { |
| 41 | char pad[8]; |
| 42 | int magic; /* DEC_BOOT_MAGIC */ |
| 43 | int mode; /* Mode for boot info. */ |
| 44 | int loadAddr; /* Address to start loading. */ |
| 45 | int execAddr; /* Address to start execing. */ |
| 46 | struct Dec_BootMap map[61]; /* boot program sections. */ |
| 47 | }; |
| 48 | |
| 49 | #define DEC_BOOT_MAGIC 0x02757a |
| 50 | #define DEC_BOOT_SECTOR 0 |