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2026-05-07 02:22:25 +03:00
commit 1a9fd27a31
226 changed files with 29188 additions and 0 deletions
@@ -0,0 +1,52 @@
+#ifndef PARTITION_H
+#define PARTITION_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "blkdev.h"
+
+#define MBR_SIGNATURE       0xAA55
+#define MBR_SIGNATURE_OFF   510
+#define MBR_PARTITION_OFF   446
+#define MBR_MAX_PARTITIONS  4
+
+#define MBR_TYPE_EMPTY      0x00
+#define MBR_TYPE_FAT12      0x01
+#define MBR_TYPE_FAT16_S    0x04
+#define MBR_TYPE_EXTENDED   0x05
+#define MBR_TYPE_FAT16      0x06
+#define MBR_TYPE_FAT32_CHS  0x0B
+#define MBR_TYPE_FAT32_LBA  0x0C
+#define MBR_TYPE_FAT16_LBA  0x0E
+#define MBR_TYPE_LINUX      0x83
+#define MBR_TYPE_ESP        0xEF
+
+typedef struct __attribute__((packed)) {
+    uint8_t  boot_flag;
+    uint8_t  chs_start[3];
+    uint8_t  type;
+    uint8_t  chs_end[3];
+    uint32_t lba_start;
+    uint32_t sector_count;
+} mbr_partition_t;
+
+typedef struct __attribute__((packed)) {
+    uint8_t         bootstrap[440];
+    uint32_t        disk_signature;
+    uint16_t        reserved;
+    mbr_partition_t partitions[4];
+    uint16_t        signature;
+} mbr_t;
+
+_Static_assert(sizeof(mbr_t) == 512, "mbr size must be 512");
+
+int partition_scan(blkdev_t *disk);
+
+int partition_write_mbr(blkdev_t *disk, const mbr_partition_t parts[4],
+                        uint32_t disk_signature);
+
+int partition_read_mbr(blkdev_t *disk, mbr_t *out);
+
+blkdev_t *partition_get(const char *name);
+
+#endif