1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * GRUB -- GRand Unified Bootloader 3*4882a593Smuzhiyun * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun /* 8*4882a593Smuzhiyun * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 9*4882a593Smuzhiyun * Use is subject to license terms. 10*4882a593Smuzhiyun */ 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #ifndef _SYS_VDEV_IMPL_H 13*4882a593Smuzhiyun #define _SYS_VDEV_IMPL_H 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #define VDEV_SKIP_SIZE (8 << 10) 16*4882a593Smuzhiyun #define VDEV_BOOT_HEADER_SIZE (8 << 10) 17*4882a593Smuzhiyun #define VDEV_PHYS_SIZE (112 << 10) 18*4882a593Smuzhiyun #define VDEV_UBERBLOCK_RING (128 << 10) 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun /* ZFS boot block */ 21*4882a593Smuzhiyun #define VDEV_BOOT_MAGIC 0x2f5b007b10cULL 22*4882a593Smuzhiyun #define VDEV_BOOT_VERSION 1 /* version number */ 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun typedef struct vdev_boot_header { 25*4882a593Smuzhiyun uint64_t vb_magic; /* VDEV_BOOT_MAGIC */ 26*4882a593Smuzhiyun uint64_t vb_version; /* VDEV_BOOT_VERSION */ 27*4882a593Smuzhiyun uint64_t vb_offset; /* start offset (bytes) */ 28*4882a593Smuzhiyun uint64_t vb_size; /* size (bytes) */ 29*4882a593Smuzhiyun char vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof(uint64_t)]; 30*4882a593Smuzhiyun } vdev_boot_header_t; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun typedef struct vdev_phys { 33*4882a593Smuzhiyun char vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)]; 34*4882a593Smuzhiyun zio_eck_t vp_zbt; 35*4882a593Smuzhiyun } vdev_phys_t; 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun typedef struct vdev_label { 38*4882a593Smuzhiyun char vl_pad[VDEV_SKIP_SIZE]; /* 8K */ 39*4882a593Smuzhiyun vdev_boot_header_t vl_boot_header; /* 8K */ 40*4882a593Smuzhiyun vdev_phys_t vl_vdev_phys; /* 112K */ 41*4882a593Smuzhiyun char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 42*4882a593Smuzhiyun } vdev_label_t; /* 256K total */ 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun /* 45*4882a593Smuzhiyun * Size and offset of embedded boot loader region on each label. 46*4882a593Smuzhiyun * The total size of the first two labels plus the boot area is 4MB. 47*4882a593Smuzhiyun */ 48*4882a593Smuzhiyun #define VDEV_BOOT_OFFSET (2 * sizeof(vdev_label_t)) 49*4882a593Smuzhiyun #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun /* 52*4882a593Smuzhiyun * Size of label regions at the start and end of each leaf device. 53*4882a593Smuzhiyun */ 54*4882a593Smuzhiyun #define VDEV_LABEL_START_SIZE (2 * sizeof(vdev_label_t) + VDEV_BOOT_SIZE) 55*4882a593Smuzhiyun #define VDEV_LABEL_END_SIZE (2 * sizeof(vdev_label_t)) 56*4882a593Smuzhiyun #define VDEV_LABELS 4 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun #endif /* _SYS_VDEV_IMPL_H */ 59