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Annotation of XNU/iokit/IOKit/storage/IOApplePartitionScheme.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: 
        !            23: #ifndef _IOAPPLEPARTITIONSCHEME_H
        !            24: #define _IOAPPLEPARTITIONSCHEME_H
        !            25: 
        !            26: #include <IOKit/IOTypes.h>
        !            27: 
        !            28: /*
        !            29:  * Apple Partition Map Definitions
        !            30:  *
        !            31:  * o  "dpme" is short for disk partition map entry
        !            32:  * o  "dpme" and "Block0" are, and shall remain, 512 bytes long
        !            33:  * o  for more information see:
        !            34:  *    o  "Inside Macintosh: Devices" pages 3-12 to 3-15
        !            35:  *    o  "Inside Macintosh - Volume V" pages V-576 to V-582
        !            36:  *    o  "Inside Macintosh - Volume IV" page IV-292
        !            37:  */
        !            38: 
        !            39: #pragma pack(4)     /* (enable 32-bit struct packing for dpme, DDMap, Block0) */
        !            40: 
        !            41: /*
        !            42:  * General constants.
        !            43:  */
        !            44: 
        !            45: #define BLOCK0_SIGNATURE  0x4552  /* (unique value for block zero, 'ER')      */
        !            46: #define DPME_SIGNATURE    0x504D  /* (unique value for partition entry, 'PM') */
        !            47: #define DPISTRLEN         32
        !            48: 
        !            49: /*
        !            50:  * Partition map entry, as found in blocks 1..n of the disk.
        !            51:  */
        !            52: 
        !            53: struct dpme
        !            54: {
        !            55:     UInt16  dpme_signature;       /* (unique value for partition entry, 'PM') */
        !            56:     UInt16  dpme_reserved_1;      /* (reserved for future use)                */
        !            57:     UInt32  dpme_map_entries;     /* (number of partition entries)            */
        !            58:     UInt32  dpme_pblock_start;    /* (physical block start of partition)      */
        !            59:     UInt32  dpme_pblocks;         /* (physical block count of partition)      */
        !            60:     char    dpme_name[DPISTRLEN]; /* (name of partition)                      */
        !            61:     char    dpme_type[DPISTRLEN]; /* (type of partition, eg. Apple_HFS)       */
        !            62:     UInt32  dpme_lblock_start;    /* (logical block start of partition)       */
        !            63:     UInt32  dpme_lblocks;         /* (logical block count of partition)       */
        !            64:     UInt32  dpme_flags;           /* (partition flags, see defines below)     */
        !            65:     UInt32  dpme_boot_block;
        !            66:     UInt32  dpme_boot_bytes;
        !            67:     UInt8 * dpme_load_addr;
        !            68:     UInt8 * dpme_load_addr_2;
        !            69:     UInt8 * dpme_goto_addr;
        !            70:     UInt8 * dpme_goto_addr_2;
        !            71:     UInt32  dpme_checksum;
        !            72:     UInt8   dpme_process_id[16];
        !            73:     UInt32  dpme_boot_args[32];
        !            74:     UInt32  dpme_reserved_3[62];
        !            75: };
        !            76: typedef struct dpme DPME;
        !            77: 
        !            78: /*
        !            79:  * Partition map entry flags (dpme_flags).
        !            80:  */
        !            81: 
        !            82: #define DPME_FLAGS_VALID          0x00000001                   /* (bit 0)     */
        !            83: #define DPME_FLAGS_ALLOCATED      0x00000002                   /* (bit 1)     */
        !            84: #define DPME_FLAGS_IN_USE         0x00000004                   /* (bit 2)     */
        !            85: #define DPME_FLAGS_BOOTABLE       0x00000008                   /* (bit 3)     */
        !            86: #define DPME_FLAGS_READABLE       0x00000010                   /* (bit 4)     */
        !            87: #define DPME_FLAGS_WRITABLE       0x00000020                   /* (bit 5)     */
        !            88: #define DPME_FLAGS_OS_PIC_CODE    0x00000040                   /* (bit 6)     */
        !            89: #define DPME_FLAGS_OS_SPECIFIC_2  0x00000080                   /* (bit 7)     */
        !            90: #define DPME_FLAGS_OS_SPECIFIC_1  0x00000100                   /* (bit 8)     */
        !            91: #define DPME_FLAGS_RESERVED_2     0xFFFFFE00                   /* (bit 9..31) */
        !            92: 
        !            93: /*
        !            94:  * Driver descriptor map entry, as found in block zero of the disk. 
        !            95:  */
        !            96: 
        !            97: struct DDMap
        !            98: {
        !            99:     UInt32  ddBlock;              /* (driver's block count, sbBlkSize-blocks) */
        !           100:     UInt16  ddSize;               /* (driver's block count, 512-blocks)       */
        !           101:     UInt16  ddType;               /* (driver's system type)                   */
        !           102: };
        !           103: typedef struct DDMap DDMap;
        !           104: 
        !           105: /*
        !           106:  * Block zero of the disk.
        !           107:  */
        !           108: 
        !           109: struct Block0
        !           110: {
        !           111:     UInt16  sbSig;                     /* (unique value for block zero, 'ER') */
        !           112:     UInt16  sbBlkSize;                 /* (block size for this device)        */
        !           113:     UInt32  sbBlkCount;                /* (block count for this device)       */
        !           114:     UInt16  sbDevType;                 /* (device type)                       */
        !           115:     UInt16  sbDevId;                   /* (device id)                         */
        !           116:     UInt32  sbData;                    /* (not used)                          */
        !           117:     UInt16  sbDrvrCount;               /* (driver descriptor count)           */
        !           118:     UInt16  sbMap[247];                /* (driver descriptor table)           */
        !           119: };
        !           120: typedef struct Block0 Block0;
        !           121: 
        !           122: #pragma options align=reset              /* (reset to default struct packing) */
        !           123: 
        !           124: /*
        !           125:  * Kernel
        !           126:  */
        !           127: 
        !           128: #if defined(KERNEL) && defined(__cplusplus)
        !           129: 
        !           130: #include <IOKit/IOBufferMemoryDescriptor.h>
        !           131: #include <IOKit/storage/IOPartitionScheme.h>
        !           132: 
        !           133: /*
        !           134:  * Class
        !           135:  */
        !           136: 
        !           137: class IOApplePartitionScheme : public IOPartitionScheme
        !           138: {
        !           139:     OSDeclareDefaultStructors(IOApplePartitionScheme);
        !           140: 
        !           141: protected:
        !           142:     IOBufferMemoryDescriptor * _buffer;      /* (necessarily one media block) */
        !           143:     UInt32                     _bufferSize;  /* (necessarily one media block) */
        !           144: 
        !           145:     bool                       _masteredAt512;
        !           146: 
        !           147:     /*
        !           148:      * Free all of this object's outstanding resources.
        !           149:      */
        !           150: 
        !           151:     virtual void free(void);
        !           152: 
        !           153:     /*
        !           154:      * Searches for the existence of an apple partition map on the given media.
        !           155:      */
        !           156: 
        !           157:     virtual bool identify(IOMedia * media);
        !           158: 
        !           159: public:
        !           160: 
        !           161:     /*
        !           162:      * Initialize this object's minimal state.
        !           163:      */
        !           164: 
        !           165:     virtual bool init(OSDictionary * properties = 0);
        !           166: 
        !           167:     /*
        !           168:      * Determine whether the provider media contains an apple partition map.  If
        !           169:      * it does, we return "this" to indicate success, otherwise we return zero.
        !           170:      */
        !           171: 
        !           172:     virtual IOService * probe(IOService * provider, SInt32 * score);
        !           173: 
        !           174:     /*
        !           175:      * This method is called once we have been attached to the media object.  We
        !           176:      * generate the new media objects that will represent our partitions here.
        !           177:      */
        !           178: 
        !           179:     virtual bool start(IOService * provider);
        !           180: };
        !           181: 
        !           182: #endif /* defined(KERNEL) && defined(__cplusplus) */
        !           183: 
        !           184: #endif /* !_IOAPPLEPARTITIONSCHEME_H */

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