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dpme.h

//
// dpme.h - Disk Partition Map Entry (dpme)
//
// Written by Eryk Vershen (eryk@apple.com)
//
// 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. 
 */

#include "bitfield.h"

//
// Defines
//
#define     BLOCK0_SIGNATURE  0x4552      /* Signature value.         */

#define     DPISTRLEN   32
#define     DPME_SIGNATURE    0x504D

// A/UX only stuff (tradition!)
#define     dpme_bzb    dpme_boot_args
#define     BZBMAGIC 0xABADBABE     /* BZB magic number */
#define     FST   ((u8) 0x1)  /* standard UNIX FS */
#define     FSTEFS      ((u8) 0x2)  /* Autorecovery FS */
#define     FSTSFS      ((u8) 0x3)  /* Swap FS */


//
// Types
//
typedef     unsigned char     u8;
typedef     unsigned short    u16;
typedef     unsigned int      u32;


// Physical block zero of the disk has this format
struct Block0 {
    u16     sbSig;            /* unique value for SCSI block 0 */
    u16     sbBlkSize;  /* block size of device */
    u32     sbBlkCount; /* number of blocks on device */
    u16     sbDevType;  /* device type */
    u16     sbDevId;    /* device id */
    u32     sbData;           /* not used */
    u16     sbDrvrCount;      /* driver descriptor count */
    u16     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 {
    u32     ddBlock;    /* 1st driver's starting block */
    u16     ddSize;           /* size of 1st driver (512-byte blks) */
    u16     ddType;           /* system type (1 for Mac+) */
};
typedef struct DDMap DDMap;


// Each partition map entry (blocks 1 through n) has this format
struct dpme {
    u16     dpme_signature          ;
    u16     dpme_reserved_1         ;
    u32     dpme_map_entries        ;
    u32     dpme_pblock_start       ;
    u32     dpme_pblocks            ;
    char    dpme_name[DPISTRLEN]    ;  /* name of partition */
    char    dpme_type[DPISTRLEN]    ;  /* type of partition */
    u32     dpme_lblock_start       ;
    u32     dpme_lblocks            ;
    u32     dpme_flags;
#if 0
    u32     dpme_reserved_2    : 23 ;  /* Bit 9 through 31.        */
    u32     dpme_os_specific_1 :  1 ;  /* Bit 8.                   */
    u32     dpme_os_specific_2 :  1 ;  /* Bit 7.                   */
    u32     dpme_os_pic_code   :  1 ;  /* Bit 6.                   */
    u32     dpme_writable      :  1 ;  /* Bit 5.                   */
    u32     dpme_readable      :  1 ;  /* Bit 4.                   */
    u32     dpme_bootable      :  1 ;  /* Bit 3.                   */
    u32     dpme_in_use        :  1 ;  /* Bit 2.                   */
    u32     dpme_allocated     :  1 ;  /* Bit 1.                   */
    u32     dpme_valid         :  1 ;  /* Bit 0.                   */
#endif
    u32     dpme_boot_block         ;
    u32     dpme_boot_bytes         ;
#ifdef __linux__
    u32     dpme_load_addr          ;
    u32     dpme_load_addr_2        ;
    u32     dpme_goto_addr          ;
    u32     dpme_goto_addr_2        ;
#else
    u8     *dpme_load_addr          ;
    u8     *dpme_load_addr_2        ;
    u8     *dpme_goto_addr          ;
    u8     *dpme_goto_addr_2        ;
#endif
    u32     dpme_checksum           ;
    char    dpme_process_id[16]     ;
    u32     dpme_boot_args[32]      ;
    u32     dpme_reserved_3[62]     ;
};
typedef struct dpme DPME;

#define     dpme_automount_set(p, v)      bitfield_set(&p->dpme_flags, 30, 1, v) /* MSch */
#define     dpme_os_specific_1_set(p, v)  bitfield_set(&p->dpme_flags, 8, 1, v)
#define     dpme_os_specific_2_set(p, v)  bitfield_set(&p->dpme_flags, 7, 1, v)
#define     dpme_os_pic_code_set(p, v)    bitfield_set(&p->dpme_flags, 6, 1, v)
#define     dpme_writable_set(p, v)       bitfield_set(&p->dpme_flags, 5, 1, v)
#define     dpme_readable_set(p, v)       bitfield_set(&p->dpme_flags, 4, 1, v)
#define     dpme_bootable_set(p, v)       bitfield_set(&p->dpme_flags, 3, 1, v)
#define     dpme_in_use_set(p, v)         bitfield_set(&p->dpme_flags, 2, 1, v)
#define     dpme_allocated_set(p, v)      bitfield_set(&p->dpme_flags, 1, 1, v)
#define     dpme_valid_set(p, v)          bitfield_set(&p->dpme_flags, 0, 1, v)

#define     dpme_automount_get(p)         bitfield_get(p->dpme_flags, 30, 1)  /* MSch */
#define     dpme_os_specific_1_get(p)     bitfield_get(p->dpme_flags, 8, 1)
#define     dpme_os_specific_2_get(p)     bitfield_get(p->dpme_flags, 7, 1)
#define     dpme_os_pic_code_get(p)       bitfield_get(p->dpme_flags, 6, 1)
#define     dpme_writable_get(p)          bitfield_get(p->dpme_flags, 5, 1)
#define     dpme_readable_get(p)          bitfield_get(p->dpme_flags, 4, 1)
#define     dpme_bootable_get(p)          bitfield_get(p->dpme_flags, 3, 1)
#define     dpme_in_use_get(p)            bitfield_get(p->dpme_flags, 2, 1)
#define     dpme_allocated_get(p)         bitfield_get(p->dpme_flags, 1, 1)
#define     dpme_valid_get(p)       bitfield_get(p->dpme_flags, 0, 1)


// 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 */
{
    u32  abm_size;      /* size of map in bytes */
    u32  abm_ents;      /* number of used entries */
    u32  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 */
{
    u32  bzb_magic;           /* magic number */
    u8   bzb_cluster;         /* Autorecovery cluster grouping */
    u8   bzb_type;            /* FS type */
    u16  bzb_inode;           /* bad block inode number */
    u32  bzb_flags;
#if 0
    u16  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 */
    u16  bzb_filler;          /* pad bitfield to 32 bits */
#endif
    u32  bzb_tmade;           /* time of FS creation */
    u32  bzb_tmount;          /* time of last mount */
    u32  bzb_tumount;         /* time of last umount */
    ABM  bzb_abm;       /* altblk map info */
    u32  bzb_fill2[7];        /* for expansion of ABM (ha!ha!) */
    u8   bzb_mount_point[64]; /* default mount point name */
};
typedef     struct bzb  BZB;

#define     bzb_root_set(p, v)            bitfield_set(&p->bzb_flags, 31, 1, v)
#define     bzb_usr_set(p, v)       bitfield_set(&p->bzb_flags, 30, 1, v)
#define     bzb_crit_set(p, v)            bitfield_set(&p->bzb_flags, 29, 1, v)
#define     bzb_slice_set(p, v)           bitfield_set(&p->bzb_flags, 20, 5, v)

#define     bzb_root_get(p)               bitfield_get(p->bzb_flags, 31, 1)
#define     bzb_usr_get(p)                bitfield_get(p->bzb_flags, 30, 1)
#define     bzb_crit_get(p)               bitfield_get(p->bzb_flags, 29, 1)
#define     bzb_slice_get(p)        bitfield_get(p->bzb_flags, 20, 5)


//
// Global Constants
//


//
// Global Variables
//


//
// Forward declarations
//

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