1 /*
2 * GRUB -- GRand Unified Bootloader
3 * Copyright (C) 1999,2000,2001,2002,2004,2007 Free Software Foundation, Inc.
4 *
5 * GRUB is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * GRUB is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #ifndef GRUB_PC_PARTITION_HEADER
20 #define GRUB_PC_PARTITION_HEADER 1
21
22 #include <grub/symbol.h>
23 #include <grub/types.h>
24 #include <grub/err.h>
25 #include "r_types.h"
26 /* The signature. */
27 #define GRUB_PC_PARTITION_SIGNATURE 0xaa55
28
29 /* This is not a flag actually, but used as if it were a flag. */
30 #define GRUB_PC_PARTITION_TYPE_HIDDEN_FLAG 0x10
31
32 /* DOS partition types. */
33 #define GRUB_PC_PARTITION_TYPE_NONE 0
34 #define GRUB_PC_PARTITION_TYPE_FAT12 1
35 #define GRUB_PC_PARTITION_TYPE_FAT16_LT32M 4
36 #define GRUB_PC_PARTITION_TYPE_EXTENDED 5
37 #define GRUB_PC_PARTITION_TYPE_FAT16_GT32M 6
38 #define GRUB_PC_PARTITION_TYPE_NTFS 7
39 #define GRUB_PC_PARTITION_TYPE_FAT32 0xb
40 #define GRUB_PC_PARTITION_TYPE_FAT32_LBA 0xc
41 #define GRUB_PC_PARTITION_TYPE_FAT16_LBA 0xe
42 #define GRUB_PC_PARTITION_TYPE_WIN95_EXTENDED 0xf
43 #define GRUB_PC_PARTITION_TYPE_EZD 0x55
44 #define GRUB_PC_PARTITION_TYPE_MINIX 0x80
45 #define GRUB_PC_PARTITION_TYPE_LINUX_MINIX 0x81
46 #define GRUB_PC_PARTITION_TYPE_EXT2FS 0x83
47 #define GRUB_PC_PARTITION_TYPE_LINUX_EXTENDED 0x85
48 #define GRUB_PC_PARTITION_TYPE_VSTAFS 0x9e
49 #define GRUB_PC_PARTITION_TYPE_FREEBSD 0xa5
50 #define GRUB_PC_PARTITION_TYPE_OPENBSD 0xa6
51 #define GRUB_PC_PARTITION_TYPE_NETBSD 0xa9
52 #define GRUB_PC_PARTITION_TYPE_HFS 0xaf
53 #define GRUB_PC_PARTITION_TYPE_GPT_DISK 0xee
54 #define GRUB_PC_PARTITION_TYPE_LINUX_RAID 0xfd
55
56 /* The partition entry. */
57 R_PACKED(
58 struct grub_msdos_partition_entry
59 {
60 /* If active, 0x80, otherwise, 0x00. */
61 grub_uint8_t flag;
62
63 /* The head of the start. */
64 grub_uint8_t start_head;
65
66 /* (S | ((C >> 2) & 0xC0)) where S is the sector of the start and C
67 is the cylinder of the start. Note that S is counted from one. */
68 grub_uint8_t start_sector;
69
70 /* (C & 0xFF) where C is the cylinder of the start. */
71 grub_uint8_t start_cylinder;
72
73 /* The partition type. */
74 grub_uint8_t type;
75
76 /* The end versions of start_head, start_sector and start_cylinder,
77 respectively. */
78 grub_uint8_t end_head;
79 grub_uint8_t end_sector;
80 grub_uint8_t end_cylinder;
81
82 /* The start sector. Note that this is counted from zero. */
83 grub_uint32_t start;
84
85 /* The length in sector units. */
86 grub_uint32_t length;
87 });
88
89 /* The structure of MBR. */
90 R_PACKED (
91 struct grub_msdos_partition_mbr
92 {
93 /* The code area (actually, including BPB). */
94 grub_uint8_t code[446];
95
96 /* Four partition entries. */
97 struct grub_msdos_partition_entry entries[4];
98
99 /* The signature 0xaa55. */
100 grub_uint16_t signature;
101 });
102
103
104
105 static inline int
grub_msdos_partition_is_empty(int type)106 grub_msdos_partition_is_empty (int type)
107 {
108 return (type == GRUB_PC_PARTITION_TYPE_NONE);
109 }
110
111 static inline int
grub_msdos_partition_is_extended(int type)112 grub_msdos_partition_is_extended (int type)
113 {
114 return (type == GRUB_PC_PARTITION_TYPE_EXTENDED
115 || type == GRUB_PC_PARTITION_TYPE_WIN95_EXTENDED
116 || type == GRUB_PC_PARTITION_TYPE_LINUX_EXTENDED);
117 }
118
119 #endif /* ! GRUB_PC_PARTITION_HEADER */
120