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Annotation of XNU/iokit/IOKit/storage/IOFDiskPartitionScheme.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 _IOFDISKPARTITIONSCHEME_H
        !            24: #define _IOFDISKPARTITIONSCHEME_H
        !            25: 
        !            26: #include <IOKit/IOTypes.h>
        !            27: 
        !            28: /*
        !            29:  * FDisk Partition Map Definitions
        !            30:  */
        !            31: 
        !            32: #pragma pack(2)   /* (enable 16-bit struct packing for fdisk_part, disk_blk0) */
        !            33: 
        !            34: /*
        !            35:  * General constants.
        !            36:  */
        !            37: 
        !            38: #define DISK_BLK0SZ    sizeof(struct disk_blk0)       /* (size of block zero) */
        !            39: #define DISK_BOOTSZ    446               /* (size of boot code in block zero) */
        !            40: #define DISK_SIGNATURE 0xAA55                /* (unique value for block zero) */
        !            41: #define DISK_NPART     4                     /* (number of partition entries) */
        !            42: 
        !            43: /*
        !            44:  * Partition map entry, as found in blocks zero of the disk.
        !            45:  */
        !            46: 
        !            47: struct fdisk_part
        !            48: {
        !            49:     UInt8   bootid;    /* (is bootable?)                                      */
        !            50:     UInt8   beghead;   /* (beginning head)                                    */
        !            51:     UInt8   begsect;   /* (beginning sector; beginning cylinder, high 2 bits) */
        !            52:     UInt8   begcyl;    /* (beginning cylinder, low 8 bits)                    */
        !            53:     UInt8   systid;    /* (type of partition)                                 */
        !            54:     UInt8   endhead;   /* (ending head)                                       */
        !            55:     UInt8   endsect;   /* (ending sector; ending cylinder, high 2 bits)       */
        !            56:     UInt8   endcyl;    /* (ending cylinder, low 8 bits)                       */
        !            57:     UInt32  relsect;   /* (physical block start of partition)                 */
        !            58:     UInt32  numsect;   /* (physical block count of partition)                 */
        !            59: };
        !            60: 
        !            61: /*
        !            62:  * Block zero of the disk.
        !            63:  */
        !            64: 
        !            65: struct disk_blk0
        !            66: {
        !            67:     UInt8             bootcode[DISK_BOOTSZ]; /* (boot code)                   */
        !            68:     struct fdisk_part parts[DISK_NPART];     /* (partition entries)           */
        !            69:     UInt16            signature;             /* (unique value for block zero) */
        !            70: };
        !            71: 
        !            72: #pragma options align=reset              /* (reset to default struct packing) */
        !            73: 
        !            74: /*
        !            75:  * Kernel
        !            76:  */
        !            77: 
        !            78: #if defined(KERNEL) && defined(__cplusplus)
        !            79: 
        !            80: #include <IOKit/IOBufferMemoryDescriptor.h>
        !            81: #include <IOKit/storage/IOPartitionScheme.h>
        !            82: 
        !            83: /*
        !            84:  * Class
        !            85:  */
        !            86: 
        !            87: class IOFDiskPartitionScheme : public IOPartitionScheme
        !            88: {
        !            89:     OSDeclareDefaultStructors(IOFDiskPartitionScheme);
        !            90: 
        !            91: protected:
        !            92:     IOBufferMemoryDescriptor * _buffer;      /* (necessarily one media block) */
        !            93:     UInt32                     _bufferSize;  /* (necessarily one media block) */
        !            94: 
        !            95:     /*
        !            96:      * Free all of this object's outstanding resources.
        !            97:      */
        !            98: 
        !            99:     virtual void free(void);
        !           100: 
        !           101:     /*
        !           102:      * Searches for the existence of an fdisk partition map on the given media.
        !           103:      */
        !           104: 
        !           105:     virtual bool identify(IOMedia * media);
        !           106: 
        !           107: public:
        !           108: 
        !           109:     /*
        !           110:      * Initialize this object's minimal state.
        !           111:      */
        !           112: 
        !           113:     virtual bool init(OSDictionary * properties = 0);
        !           114: 
        !           115:     /*
        !           116:      * Determine whether the provider media contains an fdisk partition map.  If
        !           117:      * it does, we return "this" to indicate success, otherwise we return zero.
        !           118:      */
        !           119: 
        !           120:     virtual IOService * probe(IOService * provider, SInt32 * score);
        !           121: 
        !           122:     /*
        !           123:      * This method is called once we have been attached to the media object.  We
        !           124:      * generate the new media objects that will represent our partitions here.
        !           125:      */
        !           126: 
        !           127:     virtual bool start(IOService * provider);
        !           128: };
        !           129: 
        !           130: #endif /* defined(KERNEL) && defined(__cplusplus) */
        !           131: 
        !           132: #endif /* !_IOFDISKPARTITIONSCHEME_H */

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