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 24 extern "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 55 struct 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 */ 63 struct 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 72 struct 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 80 struct 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 88 struct 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 98 struct write_list { 99 struct write_list *next; 100 loff_t offset; 101 uint32_t len; 102 uint8_t data[0]; 103 }; 104 105 106 struct write_list *alloc_wl(uint32_t data_len); 107 void free_wl(struct write_list *item); 108 struct write_list *wlist_add(struct write_list **lst, struct write_list *item); 109 void wlist_free(struct write_list *lst); 110 int wlist_commit(int fd, struct write_list *lst, int test); 111 112 struct disk_info *load_diskconfig(const char *fn, char *path_override); 113 int dump_disk_config(struct disk_info *dinfo); 114 int apply_disk_config(struct disk_info *dinfo, int test); 115 char *find_part_device(struct disk_info *dinfo, const char *name); 116 int process_disk_config(struct disk_info *dinfo); 117 struct part_info *find_part(struct disk_info *dinfo, const char *name); 118 119 int write_raw_image(const char *dst, const char *src, loff_t offset, int test); 120 121 /* For MBR partition schemes */ 122 struct write_list *config_mbr(struct disk_info *dinfo); 123 char *find_mbr_part(struct disk_info *dinfo, const char *name); 124 125 #ifdef __cplusplus 126 } 127 #endif 128 129 #endif /* __LIBS_DISKCONFIG_H */ 130
