diskconfig.h revision a6391f1006b961ca89d1c79a826375380684a4de 
1/* system/core/include/diskconfig/diskconfig.h
2 *
3 * Copyright 2008, The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#ifndef __LIBS_DISKCONFIG_H
19#define __LIBS_DISKCONFIG_H
20
21#include <stdint.h>
22
23#ifdef __cplusplus
24extern "C" {
25#endif
26
27#define MAX_NAME_LEN                 512
28#define MAX_NUM_PARTS                16
29
30/* known partition schemes */
31#define PART_SCHEME_MBR              0x1
32#define PART_SCHEME_GPT              0x2
33
34/* PC Bios partition status */
35#define PC_PART_ACTIVE               0x80
36#define PC_PART_NORMAL               0x0
37
38/* Known (rather, used by us) partition types */
39#define PC_PART_TYPE_LINUX           0x83
40#define PC_PART_TYPE_EXTENDED        0x05
41#define PC_PART_TYPE_FAT32           0x0c
42
43#define PC_NUM_BOOT_RECORD_PARTS     4
44
45#define PC_EBR_LOGICAL_PART          0
46#define PC_EBR_NEXT_PTR_PART         1
47
48#define PC_BIOS_BOOT_SIG             0xAA55
49
50#define PC_MBR_DISK_OFFSET           0
51#define PC_MBR_SIZE                  512
52
53#define PART_ACTIVE_FLAG             0x1
54
55struct chs {
56    uint8_t head;
57    uint8_t sector;
58    uint8_t cylinder;
59} __attribute__((__packed__));
60
61/* 16 byte pc partition descriptor that sits in MBR and EPBR.
62 * Note: multi-byte entities have little-endian layout on disk */
63struct pc_partition {
64    uint8_t status;     /* byte  0     */
65    struct chs start;   /* bytes 1-3   */
66    uint8_t type;       /* byte  4     */
67    struct chs end;     /* bytes 5-7   */
68    uint32_t start_lba; /* bytes 8-11  */
69    uint32_t len_lba;   /* bytes 12-15 */
70} __attribute__((__packed__));
71
72struct pc_boot_record {
73    uint8_t code[440];                                      /* bytes 0-439   */
74    uint32_t disk_sig;                                      /* bytes 440-443 */
75    uint16_t pad;                                           /* bytes 444-445 */
76    struct pc_partition ptable[PC_NUM_BOOT_RECORD_PARTS];   /* bytes 446-509 */
77    uint16_t mbr_sig;                                       /* bytes 510-511 */
78} __attribute__((__packed__));
79
80struct part_info {
81    char *name;
82    uint8_t flags;
83    uint8_t type;
84    uint32_t len_kb;       /* in 1K-bytes */
85    uint32_t start_lba;    /* the LBA where this partition begins */
86};
87
88struct disk_info {
89    char *device;
90    uint8_t scheme;
91    int sect_size;       /* expected sector size in bytes. MUST BE POWER OF 2 */
92    uint32_t skip_lba;   /* in sectors (1 unit of LBA) */
93    uint32_t num_lba;    /* the size of the disk in LBA units */
94    struct part_info *part_lst;
95    int num_parts;
96};
97
98struct write_list {
99    struct write_list *next;
100    loff_t offset;
101    uint32_t len;
102    uint8_t data[0];
103};
104
105
106struct write_list *alloc_wl(uint32_t data_len);
107void free_wl(struct write_list *item);
108struct write_list *wlist_add(struct write_list **lst, struct write_list *item);
109void wlist_free(struct write_list *lst);
110int wlist_commit(int fd, struct write_list *lst, int test);
111
112struct disk_info *load_diskconfig(const char *fn, char *path_override);
113int dump_disk_config(struct disk_info *dinfo);
114int apply_disk_config(struct disk_info *dinfo, int test);
115char *find_part_device(struct disk_info *dinfo, const char *name);
116int process_disk_config(struct disk_info *dinfo);
117struct part_info *find_part(struct disk_info *dinfo, const char *name);
118
119int write_raw_image(const char *dst, const char *src, loff_t offset, int test);
120
121/* For MBR partition schemes */
122struct write_list *config_mbr(struct disk_info *dinfo);
123char *find_mbr_part(struct disk_info *dinfo, const char *name);
124
125#ifdef __cplusplus
126}
127#endif
128
129#endif /* __LIBS_DISKCONFIG_H */
130