system: libdiskconfig: Add libdiskconfig

Change-Id: Ie7a7b5d8016dec60cdfb17228c3f519789c98564
Signed-off-by: San Mehat <san@google.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/include/diskconfig/diskconfig.h b/include/diskconfig/diskconfig.h
new file mode 100644
index 0000000..d4f468c
--- /dev/null
+++ b/include/diskconfig/diskconfig.h
@@ -0,0 +1,129 @@
+/* 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>
+
+#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 */