1 /* 2 * GRUB -- GRand Unified Bootloader 3 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 /* 8 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 9 * Use is subject to license terms. 10 */ 11 12 #ifndef _SYS_VDEV_IMPL_H 13 #define _SYS_VDEV_IMPL_H 14 15 #define VDEV_SKIP_SIZE (8 << 10) 16 #define VDEV_BOOT_HEADER_SIZE (8 << 10) 17 #define VDEV_PHYS_SIZE (112 << 10) 18 #define VDEV_UBERBLOCK_RING (128 << 10) 19 20 /* ZFS boot block */ 21 #define VDEV_BOOT_MAGIC 0x2f5b007b10cULL 22 #define VDEV_BOOT_VERSION 1 /* version number */ 23 24 typedef struct vdev_boot_header { 25 uint64_t vb_magic; /* VDEV_BOOT_MAGIC */ 26 uint64_t vb_version; /* VDEV_BOOT_VERSION */ 27 uint64_t vb_offset; /* start offset (bytes) */ 28 uint64_t vb_size; /* size (bytes) */ 29 char vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof(uint64_t)]; 30 } vdev_boot_header_t; 31 32 typedef struct vdev_phys { 33 char vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)]; 34 zio_eck_t vp_zbt; 35 } vdev_phys_t; 36 37 typedef struct vdev_label { 38 char vl_pad[VDEV_SKIP_SIZE]; /* 8K */ 39 vdev_boot_header_t vl_boot_header; /* 8K */ 40 vdev_phys_t vl_vdev_phys; /* 112K */ 41 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 42 } vdev_label_t; /* 256K total */ 43 44 /* 45 * Size and offset of embedded boot loader region on each label. 46 * The total size of the first two labels plus the boot area is 4MB. 47 */ 48 #define VDEV_BOOT_OFFSET (2 * sizeof(vdev_label_t)) 49 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 50 51 /* 52 * Size of label regions at the start and end of each leaf device. 53 */ 54 #define VDEV_LABEL_START_SIZE (2 * sizeof(vdev_label_t) + VDEV_BOOT_SIZE) 55 #define VDEV_LABEL_END_SIZE (2 * sizeof(vdev_label_t)) 56 #define VDEV_LABELS 4 57 58 #endif /* _SYS_VDEV_IMPL_H */ 59