220 lines
7.8 KiB
C
220 lines
7.8 KiB
C
//
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// dpme.h - Disk Partition Map Entry (dpme)
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//
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// Written by Eryk Vershen
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//
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// This file describes structures and values related to the standard
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// Apple SCSI disk partitioning scheme.
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//
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// Each entry is (and shall remain) 512 bytes long.
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//
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// For more information see:
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// "Inside Macintosh: Devices" pages 3-12 to 3-15.
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// "Inside Macintosh - Volume V" pages V-576 to V-582
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// "Inside Macintosh - Volume IV" page IV-292
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//
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// There is a kernel file with much of the same info (under different names):
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// /usr/src/mklinux-1.0DR2/osfmk/src/mach_kernel/ppc/POWERMAC/mac_label.h
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//
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/*
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* Copyright 1996 by Apple Computer, Inc.
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* All Rights Reserved
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies and
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* that both the copyright notice and this permission notice appear in
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* supporting documentation.
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*
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* APPLE COMPUTER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL APPLE COMPUTER BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef __dpme__
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#define __dpme__
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#include "bitfield.h"
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//
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// Defines
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//
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#define BLOCK0_SIGNATURE 0x4552 /* i.e. 'ER' */
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#define DPISTRLEN 32
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#define DPME_SIGNATURE 0x504D /* i.e. 'PM' */
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// A/UX only stuff (tradition!)
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#define dpme_bzb dpme_boot_args
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#define BZBMAGIC 0xABADBABE /* BZB magic number */
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#define FST ((u8) 0x1) /* standard UNIX FS */
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#define FSTEFS ((u8) 0x2) /* Autorecovery FS */
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#define FSTSFS ((u8) 0x3) /* Swap FS */
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//
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// Types
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//
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned long u32;
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// Physical block zero of the disk has this format
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struct Block0 {
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u16 sbSig; /* unique value for SCSI block 0 */
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u16 sbBlkSize; /* block size of device */
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u32 sbBlkCount; /* number of blocks on device */
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u16 sbDevType; /* device type */
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u16 sbDevId; /* device id */
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u32 sbData; /* not used */
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u16 sbDrvrCount; /* driver descriptor count */
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u16 sbMap[247]; /* descriptor map */
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};
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typedef struct Block0 Block0;
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// Where &sbMap[0] is actually an array DDMap[sbDrvrCount]
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// kludge to get around alignment junk
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struct DDMap {
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u32 ddBlock; /* 1st driver's starting block (in sbBlkSize blocks!) */
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u16 ddSize; /* size of 1st driver (512-byte blks) */
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u16 ddType; /* system type (1 for Mac+) */
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};
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typedef struct DDMap DDMap;
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// Each partition map entry (blocks 1 through n) has this format
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struct dpme {
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u16 dpme_signature ;
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u16 dpme_reserved_1 ;
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u32 dpme_map_entries ;
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u32 dpme_pblock_start ;
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u32 dpme_pblocks ;
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char dpme_name[DPISTRLEN] ; /* name of partition */
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char dpme_type[DPISTRLEN] ; /* type of partition */
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u32 dpme_lblock_start ;
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u32 dpme_lblocks ;
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u32 dpme_flags;
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#if 0
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u32 dpme_reserved_2 : 23 ; /* Bit 9 through 31. */
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u32 dpme_os_specific_1 : 1 ; /* Bit 8. */
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u32 dpme_os_specific_2 : 1 ; /* Bit 7. */
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u32 dpme_os_pic_code : 1 ; /* Bit 6. */
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u32 dpme_writable : 1 ; /* Bit 5. */
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u32 dpme_readable : 1 ; /* Bit 4. */
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u32 dpme_bootable : 1 ; /* Bit 3. */
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u32 dpme_in_use : 1 ; /* Bit 2. */
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u32 dpme_allocated : 1 ; /* Bit 1. */
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u32 dpme_valid : 1 ; /* Bit 0. */
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#endif
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u32 dpme_boot_block ;
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u32 dpme_boot_bytes ;
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u8 *dpme_load_addr ;
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u8 *dpme_load_addr_2 ;
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u8 *dpme_goto_addr ;
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u8 *dpme_goto_addr_2 ;
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u32 dpme_checksum ;
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char dpme_process_id[16] ;
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u32 dpme_boot_args[32] ;
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u32 dpme_reserved_3[62] ;
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};
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typedef struct dpme DPME;
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#define dpme_diskdriver_set(p, v) bitfield_set(&p->dpme_flags, 9, 1, v)
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#define dpme_chainable_set(p, v) bitfield_set(&p->dpme_flags, 8, 1, v)
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#define dpme_os_specific_1_set(p, v) bitfield_set(&p->dpme_flags, 8, 1, v)
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#define dpme_os_specific_2_set(p, v) bitfield_set(&p->dpme_flags, 7, 1, v)
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#define dpme_os_pic_code_set(p, v) bitfield_set(&p->dpme_flags, 6, 1, v)
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#define dpme_writable_set(p, v) bitfield_set(&p->dpme_flags, 5, 1, v)
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#define dpme_readable_set(p, v) bitfield_set(&p->dpme_flags, 4, 1, v)
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#define dpme_bootable_set(p, v) bitfield_set(&p->dpme_flags, 3, 1, v)
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#define dpme_in_use_set(p, v) bitfield_set(&p->dpme_flags, 2, 1, v)
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#define dpme_allocated_set(p, v) bitfield_set(&p->dpme_flags, 1, 1, v)
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#define dpme_valid_set(p, v) bitfield_set(&p->dpme_flags, 0, 1, v)
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#define dpme_diskdriver_get(p) bitfield_get(p->dpme_flags, 9, 1)
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#define dpme_chainable_get(p) bitfield_get(p->dpme_flags, 8, 1)
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#define dpme_os_specific_1_get(p) bitfield_get(p->dpme_flags, 8, 1)
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#define dpme_os_specific_2_get(p) bitfield_get(p->dpme_flags, 7, 1)
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#define dpme_os_pic_code_get(p) bitfield_get(p->dpme_flags, 6, 1)
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#define dpme_writable_get(p) bitfield_get(p->dpme_flags, 5, 1)
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#define dpme_readable_get(p) bitfield_get(p->dpme_flags, 4, 1)
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#define dpme_bootable_get(p) bitfield_get(p->dpme_flags, 3, 1)
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#define dpme_in_use_get(p) bitfield_get(p->dpme_flags, 2, 1)
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#define dpme_allocated_get(p) bitfield_get(p->dpme_flags, 1, 1)
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#define dpme_valid_get(p) bitfield_get(p->dpme_flags, 0, 1)
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// A/UX only data structures (sentimental reasons?)
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// Alternate block map (aka bad block remaping) [Never really used]
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struct abm /* altblk map info stored in bzb */
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{
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u32 abm_size; /* size of map in bytes */
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u32 abm_ents; /* number of used entries */
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u32 abm_start; /* start of altblk map */
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};
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typedef struct abm ABM;
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// BZB (Block Zero Block, but I can't remember the etymology)
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// Where &dpme_boot_args[0] is actually the address of a struct bzb
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// kludge to get around alignment junk
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struct bzb /* block zero block format */
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{
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u32 bzb_magic; /* magic number */
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u8 bzb_cluster; /* Autorecovery cluster grouping */
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u8 bzb_type; /* FS type */
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u16 bzb_inode; /* bad block inode number */
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u32 bzb_flags;
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#if 0
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u16 bzb_root:1, /* FS is a root FS */
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bzb_usr:1, /* FS is a usr FS */
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bzb_crit:1, /* FS is a critical FS */
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bzb_rsrvd:8, /* reserved for later use */
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bzb_slice:5; /* slice number to associate with plus one */
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u16 bzb_filler; /* pad bitfield to 32 bits */
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#endif
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u32 bzb_tmade; /* time of FS creation */
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u32 bzb_tmount; /* time of last mount */
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u32 bzb_tumount; /* time of last umount */
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ABM bzb_abm; /* altblk map info */
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u32 bzb_fill2[7]; /* for expansion of ABM (ha!ha!) */
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u8 bzb_mount_point[64]; /* default mount point name */
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};
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typedef struct bzb BZB;
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#define bzb_root_set(p, v) bitfield_set(&p->bzb_flags, 31, 1, v)
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#define bzb_usr_set(p, v) bitfield_set(&p->bzb_flags, 30, 1, v)
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#define bzb_crit_set(p, v) bitfield_set(&p->bzb_flags, 29, 1, v)
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#define bzb_slice_set(p, v) bitfield_set(&p->bzb_flags, 20, 5, v)
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#define bzb_root_get(p) bitfield_get(p->bzb_flags, 31, 1)
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#define bzb_usr_get(p) bitfield_get(p->bzb_flags, 30, 1)
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#define bzb_crit_get(p) bitfield_get(p->bzb_flags, 29, 1)
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#define bzb_slice_get(p) bitfield_get(p->bzb_flags, 20, 5)
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//
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// Global Constants
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//
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//
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// Global Variables
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//
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//
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// Forward declarations
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//
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#endif /* __dpme__ */
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