1 /*
2 * No copyright is claimed. This code is in the public domain; do with
3 * it what you wish.
4 */
5 #ifndef UTIL_LINUX_PT_MBR_H
6 #define UTIL_LINUX_PT_MBR_H
7
8 #include <assert.h>
9
10 struct dos_partition {
11 unsigned char boot_ind; /* 0x80 - active */
12 unsigned char bh, bs, bc; /* begin CHS */
13 unsigned char sys_ind;
14 unsigned char eh, es, ec; /* end CHS */
15 unsigned char start_sect[4];
16 unsigned char nr_sects[4];
17 } __attribute__((packed));
18
19 #define MBR_PT_OFFSET 0x1be
20 #define MBR_PT_BOOTBITS_SIZE 440
21
22 static inline struct dos_partition *mbr_get_partition(unsigned char *mbr, int i)
23 {
24 return (struct dos_partition *)
25 (mbr + MBR_PT_OFFSET + (i * sizeof(struct dos_partition)));
26 }
27
28 /* assemble badly aligned little endian integer */
29 static inline uint32_t __dos_assemble_4le(const unsigned char *p)
30 {
31 uint32_t last_byte = p[3];
32
33 return p[0] | (p[1] << 8) | (p[2] << 16) | (last_byte << 24);
34 }
35
36 static inline void __dos_store_4le(unsigned char *p, unsigned int val)
37 {
38 assert(!(p == NULL));
39 p[0] = (val & 0xff);
40 p[1] = ((val >> 8) & 0xff);
41 p[2] = ((val >> 16) & 0xff);
42 p[3] = ((val >> 24) & 0xff);
43 }
44
45 static inline unsigned int dos_partition_get_start(struct dos_partition *p)
46 {
47 return __dos_assemble_4le(&(p->start_sect[0]));
48 }
49
50 static inline void dos_partition_set_start(struct dos_partition *p, unsigned int n)
51 {
52 __dos_store_4le(p->start_sect, n);
53 }
54
55 static inline unsigned int dos_partition_get_size(struct dos_partition *p)
56 {
57 return __dos_assemble_4le(&(p->nr_sects[0]));
58 }
59
60 static inline void dos_partition_set_size(struct dos_partition *p, unsigned int n)
61 {
62 __dos_store_4le(p->nr_sects, n);
63 }
64
65 static inline void dos_partition_sync_chs(struct dos_partition *p, unsigned long long int part_offset, unsigned int geom_sectors, unsigned int geom_heads)
66 {
67 unsigned long long int start = part_offset + dos_partition_get_start(p);
68 unsigned long long int stop = start + dos_partition_get_size(p) - 1;
69 unsigned int spc = geom_heads * geom_sectors;
70
71 if (start / spc > 1023)
72 start = spc * 1024 - 1;
73 if (stop / spc > 1023)
74 stop = spc * 1024 - 1;
75
76 p->bc = (start / spc) & 0xff;
77 p->bh = (start / geom_sectors) % geom_heads;
78 p->bs = ((start % geom_sectors + 1) & 0x3f) |
79 (((start / spc) >> 2) & 0xc0);
80
81 p->ec = (stop / spc) & 0xff;
82 p->eh = (stop / geom_sectors) % geom_heads;
83 p->es = ((stop % geom_sectors + 1) & 0x3f) |
84 (((stop / spc) >> 2) & 0xc0);
85 }
86
87 static inline int mbr_is_valid_magic(const unsigned char *mbr)
88 {
89 return mbr[510] == 0x55 && mbr[511] == 0xaa ? 1 : 0;
90 }
91
92 static inline void mbr_set_magic(unsigned char *b)
93 {
94 b[510] = 0x55;
95 b[511] = 0xaa;
96 }
97
98 static inline unsigned int mbr_get_id(const unsigned char *mbr)
99 {
100 return __dos_assemble_4le(&mbr[440]);
101 }
102
103 static inline void mbr_set_id(unsigned char *b, unsigned int id)
104 {
105 __dos_store_4le(&b[440], id);
106 }
107
108 enum {
109 MBR_EMPTY_PARTITION = 0x00,
110 MBR_FAT12_PARTITION = 0x01,
111 MBR_XENIX_ROOT_PARTITION = 0x02,
112 MBR_XENIX_USR_PARTITION = 0x03,
113 MBR_FAT16_LESS32M_PARTITION = 0x04,
114 MBR_DOS_EXTENDED_PARTITION = 0x05,
115 MBR_FAT16_PARTITION = 0x06, /* DOS 16-bit >=32M */
116 MBR_HPFS_NTFS_PARTITION = 0x07, /* OS/2 IFS, eg, HPFS or NTFS or QNX */
117 MBR_AIX_PARTITION = 0x08, /* AIX boot (AIX -- PS/2 port) or SplitDrive */
118 MBR_AIX_BOOTABLE_PARTITION = 0x09, /* AIX data or Coherent */
119 MBR_OS2_BOOTMNGR_PARTITION = 0x0a, /* OS/2 Boot Manager */
120 MBR_W95_FAT32_PARTITION = 0x0b,
121 MBR_W95_FAT32_LBA_PARTITION = 0x0c, /* LBA really is `Extended Int 13h' */
122 MBR_W95_FAT16_LBA_PARTITION = 0x0e,
123 MBR_W95_EXTENDED_PARTITION = 0x0f,
124 MBR_OPUS_PARTITION = 0x10,
125 MBR_HIDDEN_FAT12_PARTITION = 0x11,
126 MBR_COMPAQ_DIAGNOSTICS_PARTITION = 0x12,
127 MBR_HIDDEN_FAT16_L32M_PARTITION = 0x14,
128 MBR_HIDDEN_FAT16_PARTITION = 0x16,
129 MBR_HIDDEN_HPFS_NTFS_PARTITION = 0x17,
130 MBR_AST_SMARTSLEEP_PARTITION = 0x18,
131 MBR_HIDDEN_W95_FAT32_PARTITION = 0x1b,
132 MBR_HIDDEN_W95_FAT32LBA_PARTITION = 0x1c,
133 MBR_HIDDEN_W95_FAT16LBA_PARTITION = 0x1e,
134 MBR_NEC_DOS_PARTITION = 0x24,
135 MBR_PLAN9_PARTITION = 0x39,
136 MBR_PARTITIONMAGIC_PARTITION = 0x3c,
137 MBR_VENIX80286_PARTITION = 0x40,
138 MBR_PPC_PREP_BOOT_PARTITION = 0x41,
139 MBR_SFS_PARTITION = 0x42,
140 MBR_QNX_4X_PARTITION = 0x4d,
141 MBR_QNX_4X_2ND_PARTITION = 0x4e,
142 MBR_QNX_4X_3RD_PARTITION = 0x4f,
143 MBR_DM_PARTITION = 0x50,
144 MBR_DM6_AUX1_PARTITION = 0x51, /* (or Novell) */
145 MBR_CPM_PARTITION = 0x52, /* CP/M or Microport SysV/AT */
146 MBR_DM6_AUX3_PARTITION = 0x53,
147 MBR_DM6_PARTITION = 0x54,
148 MBR_EZ_DRIVE_PARTITION = 0x55,
149 MBR_GOLDEN_BOW_PARTITION = 0x56,
150 MBR_PRIAM_EDISK_PARTITION = 0x5c,
151 MBR_SPEEDSTOR_PARTITION = 0x61,
152 MBR_GNU_HURD_PARTITION = 0x63, /* GNU HURD or Mach or Sys V/386 (such as ISC UNIX) */
153 MBR_UNIXWARE_PARTITION = MBR_GNU_HURD_PARTITION,
154 MBR_NETWARE_286_PARTITION = 0x64,
155 MBR_NETWARE_386_PARTITION = 0x65,
156 MBR_DISKSECURE_MULTIBOOT_PARTITION = 0x70,
157 MBR_PC_IX_PARTITION = 0x75,
158 MBR_OLD_MINIX_PARTITION = 0x80, /* Minix 1.4a and earlier */
159 MBR_MINIX_PARTITION = 0x81, /* Minix 1.4b and later */
160 MBR_LINUX_SWAP_PARTITION = 0x82,
161 MBR_SOLARIS_X86_PARTITION = MBR_LINUX_SWAP_PARTITION,
162 MBR_LINUX_DATA_PARTITION = 0x83,
163 MBR_OS2_HIDDEN_DRIVE_PARTITION = 0x84, /* also hibernation MS APM, Intel Rapid Start */
164 MBR_INTEL_HIBERNATION_PARTITION = MBR_OS2_HIDDEN_DRIVE_PARTITION,
165 MBR_LINUX_EXTENDED_PARTITION = 0x85,
166 MBR_NTFS_VOL_SET1_PARTITION = 0x86,
167 MBR_NTFS_VOL_SET2_PARTITION = 0x87,
168 MBR_LINUX_PLAINTEXT_PARTITION = 0x88,
169 MBR_LINUX_LVM_PARTITION = 0x8e,
170 MBR_AMOEBA_PARTITION = 0x93,
171 MBR_AMOEBA_BBT_PARTITION = 0x94, /* (bad block table) */
172 MBR_BSD_OS_PARTITION = 0x9f, /* BSDI */
173 MBR_THINKPAD_HIBERNATION_PARTITION = 0xa0,
174 MBR_FREEBSD_PARTITION = 0xa5, /* various BSD flavours */
175 MBR_OPENBSD_PARTITION = 0xa6,
176 MBR_NEXTSTEP_PARTITION = 0xa7,
177 MBR_DARWIN_UFS_PARTITION = 0xa8,
178 MBR_NETBSD_PARTITION = 0xa9,
179 MBR_DARWIN_BOOT_PARTITION = 0xab,
180 MBR_HFS_HFS_PARTITION = 0xaf,
181 MBR_BSDI_FS_PARTITION = 0xb7,
182 MBR_BSDI_SWAP_PARTITION = 0xb8,
183 MBR_BOOTWIZARD_HIDDEN_PARTITION = 0xbb,
184 MBR_ACRONIS_FAT32LBA_PARTITION = 0xbc, /* Acronis Secure Zone with ipl for loader F11.SYS */
185 MBR_SOLARIS_BOOT_PARTITION = 0xbe,
186 MBR_SOLARIS_PARTITION = 0xbf,
187 MBR_DRDOS_FAT12_PARTITION = 0xc1,
188 MBR_DRDOS_FAT16_L32M_PARTITION = 0xc4,
189 MBR_DRDOS_FAT16_PARTITION = 0xc6,
190 MBR_SYRINX_PARTITION = 0xc7,
191 MBR_NONFS_DATA_PARTITION = 0xda,
192 MBR_CPM_CTOS_PARTITION = 0xdb, /* CP/M or Concurrent CP/M or Concurrent DOS or CTOS */
193 MBR_DELL_UTILITY_PARTITION = 0xde, /* Dell PowerEdge Server utilities */
194 MBR_BOOTIT_PARTITION = 0xdf, /* BootIt EMBRM */
195 MBR_DOS_ACCESS_PARTITION = 0xe1, /* DOS access or SpeedStor 12-bit FAT extended partition */
196 MBR_DOS_RO_PARTITION = 0xe3, /* DOS R/O or SpeedStor */
197 MBR_SPEEDSTOR_EXTENDED_PARTITION = 0xe4, /* SpeedStor 16-bit FAT extended partition < 1024 cyl. */
198 MBR_RUFUS_EXTRA_PARTITION = 0xea, /* Rufus extra partition for alignment */
199 MBR_BEOS_FS_PARTITION = 0xeb,
200 MBR_GPT_PARTITION = 0xee, /* Intel EFI GUID Partition Table */
201 MBR_EFI_SYSTEM_PARTITION = 0xef, /* Intel EFI System Partition */
202 MBR_LINUX_PARISC_BOOT_PARTITION = 0xf0, /* Linux/PA-RISC boot loader */
203 MBR_SPEEDSTOR1_PARTITION = 0xf1,
204 MBR_SPEEDSTOR2_PARTITION = 0xf4, /* SpeedStor large partition */
205 MBR_DOS_SECONDARY_PARTITION = 0xf2, /* DOS 3.3+ secondary */
206 MBR_EBBR_PROTECTIVE_PARTITION = 0xf8, /* Arm EBBR firmware protective partition */
207 MBR_VMWARE_VMFS_PARTITION = 0xfb,
208 MBR_VMWARE_VMKCORE_PARTITION = 0xfc, /* VMware kernel dump partition */
209 MBR_LINUX_RAID_PARTITION = 0xfd, /* Linux raid partition with autodetect using persistent superblock */
210 MBR_LANSTEP_PARTITION = 0xfe, /* SpeedStor >1024 cyl. or LANstep */
211 MBR_XENIX_BBT_PARTITION = 0xff, /* Xenix Bad Block Table */
212 };
213
214 #endif /* UTIL_LINUX_PT_MBR_H */