1 /* libs/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 #define MAX_NAME_LEN 512 24 #define MAX_NUM_PARTS 16 25 26 /* known partition schemes */ 27 #define PART_SCHEME_MBR 0x1 28 #define PART_SCHEME_GPT 0x2 29 30 /* PC Bios partition status */ 31 #define PC_PART_ACTIVE 0x80 32 #define PC_PART_NORMAL 0x0 33 34 /* Known (rather, used by us) partition types */ 35 #define PC_PART_TYPE_LINUX 0x83 36 #define PC_PART_TYPE_EXTENDED 0x05 37 38 #define PC_NUM_BOOT_RECORD_PARTS 4 39 40 #define PC_EBR_LOGICAL_PART 0 41 #define PC_EBR_NEXT_PTR_PART 1 42 43 #define PC_BIOS_BOOT_SIG 0xAA55 44 45 #define PC_MBR_DISK_OFFSET 0 46 #define PC_MBR_SIZE 512 47 48 #define PART_ACTIVE_FLAG 0x1 49 50 struct chs { 51 uint8_t head; 52 uint8_t sector; 53 uint8_t cylinder; 54 } __attribute__((__packed__)); 55 56 /* 16 byte pc partition descriptor that sits in MBR and EPBR. 57 * Note: multi-byte entities have little-endian layout on disk */ 58 struct pc_partition { 59 uint8_t status; /* byte 0 */ 60 struct chs start; /* bytes 1-3 */ 61 uint8_t type; /* byte 4 */ 62 struct chs end; /* bytes 5-7 */ 63 uint32_t start_lba; /* bytes 8-11 */ 64 uint32_t len_lba; /* bytes 12-15 */ 65 } __attribute__((__packed__)); 66 67 struct pc_boot_record { 68 uint8_t code[440]; /* bytes 0-439 */ 69 uint32_t disk_sig; /* bytes 440-443 */ 70 uint16_t pad; /* bytes 444-445 */ 71 struct pc_partition ptable[PC_NUM_BOOT_RECORD_PARTS]; /* bytes 446-509 */ 72 uint16_t mbr_sig; /* bytes 510-511 */ 73 } __attribute__((__packed__)); 74 75 struct part_info { 76 char *name; 77 uint8_t flags; 78 uint8_t type; 79 uint32_t len_kb; /* in 1K-bytes */ 80 uint32_t start_lba; /* the LBA where this partition begins */ 81 }; 82 83 struct disk_info { 84 char *device; 85 uint8_t scheme; 86 int sect_size; /* expected sector size in bytes. MUST BE POWER OF 2 */ 87 uint32_t skip_lba; /* in sectors (1 unit of LBA) */ 88 uint32_t num_lba; /* the size of the disk in LBA units */ 89 struct part_info *part_lst; 90 int num_parts; 91 }; 92 93 struct write_list { 94 struct write_list *next; 95 loff_t offset; 96 uint32_t len; 97 uint8_t data[0]; 98 }; 99 100 101 struct write_list *alloc_wl(uint32_t data_len); 102 void free_wl(struct write_list *item); 103 struct write_list *wlist_add(struct write_list **lst, struct write_list *item); 104 void wlist_free(struct write_list *lst); 105 int wlist_commit(int fd, struct write_list *lst, int test); 106 107 struct disk_info *load_diskconfig(const char *fn, char *path_override); 108 int dump_disk_config(struct disk_info *dinfo); 109 int apply_disk_config(struct disk_info *dinfo, int test); 110 char *find_part_device(struct disk_info *dinfo, const char *name); 111 int process_disk_config(struct disk_info *dinfo); 112 struct part_info *find_part(struct disk_info *dinfo, const char *name); 113 114 int write_raw_image(const char *dst, const char *src, loff_t offset, int test); 115 116 /* For MBR partition schemes */ 117 struct write_list *config_mbr(struct disk_info *dinfo); 118 char *find_mbr_part(struct disk_info *dinfo, const char *name); 119 120 #endif /* __LIBS_DISKCONFIG_H */ 121
