//
// dpme.h - Disk Partition Map Entry (dpme)
//
// Written by Eryk Vershen
//
// This file describes structures and values related to the standard
// Apple SCSI disk partitioning scheme.
//
// Each entry is (and shall remain) 512 bytes long.
//
// For more information see:
// "Inside Macintosh: Devices" pages 3-12 to 3-15.
// "Inside Macintosh - Volume V" pages V-576 to V-582
// "Inside Macintosh - Volume IV" page IV-292
//
// There is a kernel file with much of the same info (under different names):
// /usr/src/mklinux-1.0DR2/osfmk/src/mach_kernel/ppc/POWERMAC/mac_label.h
//
/*
* Copyright 1996 by Apple Computer, Inc.
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* APPLE COMPUTER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL APPLE COMPUTER BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __dpme__
#define __dpme__
// Physical block zero of the disk has this format
struct Block0 {
uint16_t sbSig; /* unique value for SCSI block 0 */
uint16_t sbBlkSize; /* block size of device */
uint32_t sbBlkCount; /* number of blocks on device */
uint16_t sbDevType; /* device type */
uint16_t sbDevId; /* device id */
uint32_t sbData; /* not used */
uint16_t sbDrvrCount; /* driver descriptor count */
uint16_t sbMap[247]; /* descriptor map */
};
typedef struct Block0 Block0;
// Where &sbMap[0] is actually an array DDMap[sbDrvrCount]
// kludge to get around alignment junk
struct DDMap {
uint32_t ddBlock; /* 1st driver's starting block (in sbBlkSize blocks!) */
uint16_t ddSize; /* size of 1st driver (512-byte blks) */
uint16_t ddType; /* system type (1 for Mac+) */
};
typedef struct DDMap DDMap;
// Each partition map entry (blocks 1 through n) has this format
struct dpme {
uint16_t dpme_signature ;
uint16_t dpme_reserved_1 ;
uint32_t dpme_map_entries ;
uint32_t dpme_pblock_start ;
uint32_t dpme_pblocks ;
char dpme_name[DPISTRLEN] ; /* name of partition */
char dpme_type[DPISTRLEN] ; /* type of partition */
uint32_t dpme_lblock_start ;
uint32_t dpme_lblocks ;
uint32_t dpme_flags;
#if 0
uint32_t dpme_reserved_2 : 23 ; /* Bit 9 through 31. */
uint32_t dpme_os_specific_1 : 1 ; /* Bit 8. */
uint32_t dpme_os_specific_2 : 1 ; /* Bit 7. */
uint32_t dpme_os_pic_code : 1 ; /* Bit 6. */
uint32_t dpme_writable : 1 ; /* Bit 5. */
uint32_t dpme_readable : 1 ; /* Bit 4. */
uint32_t dpme_bootable : 1 ; /* Bit 3. */
uint32_t dpme_in_use : 1 ; /* Bit 2. */
uint32_t dpme_allocated : 1 ; /* Bit 1. */
uint32_t dpme_valid : 1 ; /* Bit 0. */
#endif
uint32_t dpme_boot_block ;
uint32_t dpme_boot_bytes ;
uint32_t dpme_load_addr ;
uint32_t dpme_load_addr_2 ;
uint32_t dpme_goto_addr ;
uint32_t dpme_goto_addr_2 ;
uint32_t dpme_checksum ;
char dpme_process_id[16] ;
uint32_t dpme_boot_args[32] ;
uint32_t dpme_reserved_3[62] ;
};
typedef struct dpme DPME;
// A/UX only data structures (sentimental reasons?)
// Alternate block map (aka bad block remaping) [Never really used]
struct abm /* altblk map info stored in bzb */
{
uint32_t abm_size; /* size of map in bytes */
uint32_t abm_ents; /* number of used entries */
uint32_t abm_start; /* start of altblk map */
};
typedef struct abm ABM;
// BZB (Block Zero Block, but I can't remember the etymology)
// Where &dpme_boot_args[0] is actually the address of a struct bzb
// kludge to get around alignment junk
struct bzb /* block zero block format */
{
uint32_t bzb_magic; /* magic number */
uint8_t bzb_cluster; /* Autorecovery cluster grouping */
uint8_t bzb_type; /* FS type */
uint16_t bzb_inode; /* bad block inode number */
uint32_t bzb_flags;
#if 0
uint16_t bzb_root:1, /* FS is a root FS */
bzb_usr:1, /* FS is a usr FS */
bzb_crit:1, /* FS is a critical FS */
bzb_rsrvd:8, /* reserved for later use */
bzb_slice:5; /* slice number to associate with plus one */
uint16_t bzb_filler; /* pad bitfield to 32 bits */
#endif
uint32_t bzb_tmade; /* time of FS creation */
uint32_t bzb_tmount; /* time of last mount */
uint32_t bzb_tumount; /* time of last umount */
ABM bzb_abm; /* altblk map info */
uint32_t bzb_fill2[7]; /* for expansion of ABM (ha!ha!) */
uint8_t bzb_mount_point[64]; /* default mount point name */
};
typedef struct bzb BZB;
