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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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