git.sur5r.net Git - u-boot/blob - include/zfs/vdev_impl.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   5  */
   6 /*
   7  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
   8  * Use is subject to license terms.
   9  */
  10
  11 #ifndef _SYS_VDEV_IMPL_H
  12 #define _SYS_VDEV_IMPL_H
  13
  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)
  18
  19 /* ZFS boot block */
  20 #define VDEV_BOOT_MAGIC         0x2f5b007b10cULL
  21 #define VDEV_BOOT_VERSION       1               /* version number       */
  22
  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)];
  29 } vdev_boot_header_t;
  30
  31 typedef struct vdev_phys {
  32         char            vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)];
  33         zio_eck_t       vp_zbt;
  34 } vdev_phys_t;
  35
  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 */
  42
  43 /*
  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.
  46  */
  47 #define VDEV_BOOT_OFFSET        (2 * sizeof(vdev_label_t))
  48 #define VDEV_BOOT_SIZE          (7ULL << 19)                    /* 3.5M */
  49
  50 /*
  51  * Size of label regions at the start and end of each leaf device.
  52  */
  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))
  55 #define VDEV_LABELS             4
  56
  57 #endif  /* _SYS_VDEV_IMPL_H */