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/* system/core/include/diskconfig/diskconfig.h
*
* Copyright 2008, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __LIBS_DISKCONFIG_H
#define __LIBS_DISKCONFIG_H
#include <stdint.h>
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_NAME_LEN 512
#define MAX_NUM_PARTS 16
/* known partition schemes */
#define PART_SCHEME_MBR 0x1
#define PART_SCHEME_GPT 0x2
/* PC Bios partition status */
#define PC_PART_ACTIVE 0x80
#define PC_PART_NORMAL 0x0
/* Known (rather, used by us) partition types */
#define PC_PART_TYPE_LINUX 0x83
#define PC_PART_TYPE_EXTENDED 0x05
#define PC_PART_TYPE_FAT32 0x0c
#define PC_NUM_BOOT_RECORD_PARTS 4
#define PC_EBR_LOGICAL_PART 0
#define PC_EBR_NEXT_PTR_PART 1
#define PC_BIOS_BOOT_SIG 0xAA55
#define PC_MBR_DISK_OFFSET 0
#define PC_MBR_SIZE 512
#define PART_ACTIVE_FLAG 0x1
struct chs {
uint8_t head;
uint8_t sector;
uint8_t cylinder;
} __attribute__((__packed__));
/* 16 byte pc partition descriptor that sits in MBR and EPBR.
* Note: multi-byte entities have little-endian layout on disk */
struct pc_partition {
uint8_t status; /* byte 0 */
struct chs start; /* bytes 1-3 */
uint8_t type; /* byte 4 */
struct chs end; /* bytes 5-7 */
uint32_t start_lba; /* bytes 8-11 */
uint32_t len_lba; /* bytes 12-15 */
} __attribute__((__packed__));
struct pc_boot_record {
uint8_t code[440]; /* bytes 0-439 */
uint32_t disk_sig; /* bytes 440-443 */
uint16_t pad; /* bytes 444-445 */
struct pc_partition ptable[PC_NUM_BOOT_RECORD_PARTS]; /* bytes 446-509 */
uint16_t mbr_sig; /* bytes 510-511 */
} __attribute__((__packed__));
struct part_info {
char *name;
uint8_t flags;
uint8_t type;
uint32_t len_kb; /* in 1K-bytes */
uint32_t start_lba; /* the LBA where this partition begins */
};
struct disk_info {
char *device;
uint8_t scheme;
int sect_size; /* expected sector size in bytes. MUST BE POWER OF 2 */
uint32_t skip_lba; /* in sectors (1 unit of LBA) */
uint32_t num_lba; /* the size of the disk in LBA units */
struct part_info *part_lst;
int num_parts;
};
struct write_list {
struct write_list *next;
loff_t offset;
uint32_t len;
uint8_t data[0];
};
struct write_list *alloc_wl(uint32_t data_len);
void free_wl(struct write_list *item);
struct write_list *wlist_add(struct write_list **lst, struct write_list *item);
void wlist_free(struct write_list *lst);
int wlist_commit(int fd, struct write_list *lst, int test);
struct disk_info *load_diskconfig(const char *fn, char *path_override);
int dump_disk_config(struct disk_info *dinfo);
int apply_disk_config(struct disk_info *dinfo, int test);
char *find_part_device(struct disk_info *dinfo, const char *name);
int process_disk_config(struct disk_info *dinfo);
struct part_info *find_part(struct disk_info *dinfo, const char *name);
int write_raw_image(const char *dst, const char *src, loff_t offset, int test);
/* For MBR partition schemes */
struct write_list *config_mbr(struct disk_info *dinfo);
char *find_mbr_part(struct disk_info *dinfo, const char *name);
#ifdef __cplusplus
}
#endif
#endif /* __LIBS_DISKCONFIG_H */
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