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