1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
7 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
8 * Use is subject to license terms.
11 #ifndef _SYS_VDEV_IMPL_H
12 #define _SYS_VDEV_IMPL_H
14 #define VDEV_SKIP_SIZE (8 << 10)
15 #define VDEV_BOOT_HEADER_SIZE (8 << 10)
16 #define VDEV_PHYS_SIZE (112 << 10)
17 #define VDEV_UBERBLOCK_RING (128 << 10)
20 #define VDEV_BOOT_MAGIC 0x2f5b007b10cULL
21 #define VDEV_BOOT_VERSION 1 /* version number */
23 typedef struct vdev_boot_header {
24 uint64_t vb_magic; /* VDEV_BOOT_MAGIC */
25 uint64_t vb_version; /* VDEV_BOOT_VERSION */
26 uint64_t vb_offset; /* start offset (bytes) */
27 uint64_t vb_size; /* size (bytes) */
28 char vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof(uint64_t)];
31 typedef struct vdev_phys {
32 char vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)];
36 typedef struct vdev_label {
37 char vl_pad[VDEV_SKIP_SIZE]; /* 8K */
38 vdev_boot_header_t vl_boot_header; /* 8K */
39 vdev_phys_t vl_vdev_phys; /* 112K */
40 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
41 } vdev_label_t; /* 256K total */
44 * Size and offset of embedded boot loader region on each label.
45 * The total size of the first two labels plus the boot area is 4MB.
47 #define VDEV_BOOT_OFFSET (2 * sizeof(vdev_label_t))
48 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
51 * Size of label regions at the start and end of each leaf device.
53 #define VDEV_LABEL_START_SIZE (2 * sizeof(vdev_label_t) + VDEV_BOOT_SIZE)
54 #define VDEV_LABEL_END_SIZE (2 * sizeof(vdev_label_t))
57 #endif /* _SYS_VDEV_IMPL_H */