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      1 /*
      2  *  GRUB  --  GRand Unified Bootloader
      3  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
      4  *
      5  *  This program is free software; you can redistribute it and/or modify
      6  *  it under the terms of the GNU General Public License as published by
      7  *  the Free Software Foundation; either version 2 of the License, or
      8  *  (at your option) any later version.
      9  *
     10  *  This program is distributed in the hope that it will be useful,
     11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13  *  GNU General Public License for more details.
     14  *
     15  *  You should have received a copy of the GNU General Public License
     16  *  along with this program; if not, write to the Free Software
     17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     18  */
     19 /*
     20  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
     21  * Use is subject to license terms.
     22  */
     23 
     24 #ifndef _SYS_VDEV_IMPL_H
     25 #define	_SYS_VDEV_IMPL_H
     26 
     27 #define	VDEV_PAD_SIZE 		(8 << 10)
     28 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
     29 #define	VDEV_SKIP_SIZE		VDEV_PAD_SIZE * 2
     30 #define	VDEV_PHYS_SIZE		(112 << 10)
     31 #define	VDEV_UBERBLOCK_RING	(128 << 10)
     32 
     33 typedef struct vdev_phys {
     34 	char		vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_block_tail_t)];
     35 	zio_block_tail_t vp_zbt;
     36 } vdev_phys_t;
     37 
     38 typedef struct vdev_label {
     39 	char		vl_pad1[VDEV_PAD_SIZE];			/*  8K	*/
     40 	char		vl_pad2[VDEV_PAD_SIZE];			/*  8K	*/
     41 	vdev_phys_t	vl_vdev_phys;				/* 112K	*/
     42 	char		vl_uberblock[VDEV_UBERBLOCK_RING];	/* 128K	*/
     43 } vdev_label_t;							/* 256K total */
     44 
     45 /*
     46  * Size and offset of embedded boot loader region on each label.
     47  * The total size of the first two labels plus the boot area is 4MB.
     48  */
     49 #define	VDEV_BOOT_OFFSET	(2 * sizeof (vdev_label_t))
     50 #define	VDEV_BOOT_SIZE		(7ULL << 19)			/* 3.5M	*/
     51 
     52 /*
     53  * Size of label regions at the start and end of each leaf device.
     54  */
     55 #define	VDEV_LABEL_START_SIZE	(2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
     56 #define	VDEV_LABEL_END_SIZE	(2 * sizeof (vdev_label_t))
     57 #define	VDEV_LABELS		4
     58 
     59 #endif	/* _SYS_VDEV_IMPL_H */
     60