152130Smckusick /* 252130Smckusick * Copyright (c) 1992 Regents of the University of California. 352130Smckusick * All rights reserved. 452130Smckusick * 552130Smckusick * This code is derived from software contributed to Berkeley by 652130Smckusick * Ralph Campbell. 752130Smckusick * 852130Smckusick * %sccs.include.redist.c% 952130Smckusick * 10*53205Sralph * @(#)dec_boot.h 7.2 (Berkeley) 04/19/92 1152130Smckusick * 1252130Smckusick * devDiskLabel.h -- 1352130Smckusick * 1452130Smckusick * This defines the disk label that Sun writes on the 0'th sector of 1552130Smckusick * the 0'th cylinder of its SMD disks. The disk label contains some 1652130Smckusick * geometry information and also the division of the disk into a 1752130Smckusick * number of partitions. Each partition is identified to the drive 1852130Smckusick * by a different unit number. 1952130Smckusick * 2052130Smckusick * from: $Header: /sprite/src/kernel/dev/RCS/devDiskLabel.h, 2152130Smckusick * v 9.4 90/03/01 12:22:36 jhh Exp $ SPRITE (Berkeley) 2252130Smckusick */ 2352130Smckusick 2452130Smckusick /* 2552130Smckusick * Boot block information on the 0th sector. 2652130Smckusick * The boot program is stored in sequences of contiguous blocks. 2752130Smckusick * If mode is 0, there is just one sequence of blocks and one Dec_BootMap 2852130Smckusick * is used. If mode is 1, there are multiple sequences of blocks 2952130Smckusick * and multiple Dec_BootMaps are used, the last with numBlocks = 0. 30*53205Sralph * 31*53205Sralph * NOTE: The standard disk label offset is 64 which is 32*53205Sralph * after the boot information expected by the PROM boot loader. 3352130Smckusick */ 34*53205Sralph 35*53205Sralph struct Dec_BootMap { 36*53205Sralph int numBlocks; /* Number of blocks to read. */ 37*53205Sralph int startBlock; /* Starting block on disk. */ 38*53205Sralph }; 39*53205Sralph 40*53205Sralph struct Dec_DiskBoot { 41*53205Sralph char pad[8]; 42*53205Sralph int magic; /* DEC_BOOT_MAGIC */ 43*53205Sralph int mode; /* Mode for boot info. */ 44*53205Sralph int loadAddr; /* Address to start loading. */ 45*53205Sralph int execAddr; /* Address to start execing. */ 46*53205Sralph struct Dec_BootMap map[61]; /* boot program sections. */ 47*53205Sralph }; 4852130Smckusick 4952130Smckusick #define DEC_BOOT_MAGIC 0x02757a 50*53205Sralph #define DEC_BOOT_SECTOR 0 51