1/*******************************************************************************
  2 * Filename:  target_core_scdb.c
  3 *
  4 * This file contains the generic target engine Split CDB related functions.
  5 *
  6 * Copyright (c) 2004-2005 PyX Technologies, Inc.
  7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
  8 * Copyright (c) 2007-2010 Rising Tide Systems
  9 * Copyright (c) 2008-2010 Linux-iSCSI.org
 10 *
 11 * Nicholas A. Bellinger <nab@kernel.org>
 12 *
 13 * This program is free software; you can redistribute it and/or modify
 14 * it under the terms of the GNU General Public License as published by
 15 * the Free Software Foundation; either version 2 of the License, or
 16 * (at your option) any later version.
 17 *
 18 * This program is distributed in the hope that it will be useful,
 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21 * GNU General Public License for more details.
 22 *
 23 * You should have received a copy of the GNU General Public License
 24 * along with this program; if not, write to the Free Software
 25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 26 *
 27 ******************************************************************************/
 28
 29#include <linux/net.h>
 30#include <linux/string.h>
 31#include <scsi/scsi.h>
 32#include <asm/unaligned.h>
 33
 34#include <target/target_core_base.h>
 35#include <target/target_core_transport.h>
 36
 37#include "target_core_scdb.h"
 38
 39/*	split_cdb_XX_6():
 40 *
 41 *      21-bit LBA w/ 8-bit SECTORS
 42 */
 43void split_cdb_XX_6(
 44	unsigned long long lba,
 45	u32 sectors,
 46	unsigned char *cdb)
 47{
 48	cdb[1] = (lba >> 16) & 0x1f;
 49	cdb[2] = (lba >> 8) & 0xff;
 50	cdb[3] = lba & 0xff;
 51	cdb[4] = sectors & 0xff;
 52}
 53
 54/*	split_cdb_XX_10():
 55 *
 56 *	32-bit LBA w/ 16-bit SECTORS
 57 */
 58void split_cdb_XX_10(
 59	unsigned long long lba,
 60	u32 sectors,
 61	unsigned char *cdb)
 62{
 63	put_unaligned_be32(lba, &cdb[2]);
 64	put_unaligned_be16(sectors, &cdb[7]);
 65}
 66
 67/*	split_cdb_XX_12():
 68 *
 69 *	32-bit LBA w/ 32-bit SECTORS
 70 */
 71void split_cdb_XX_12(
 72	unsigned long long lba,
 73	u32 sectors,
 74	unsigned char *cdb)
 75{
 76	put_unaligned_be32(lba, &cdb[2]);
 77	put_unaligned_be32(sectors, &cdb[6]);
 78}
 79
 80/*	split_cdb_XX_16():
 81 *
 82 *	64-bit LBA w/ 32-bit SECTORS
 83 */
 84void split_cdb_XX_16(
 85	unsigned long long lba,
 86	u32 sectors,
 87	unsigned char *cdb)
 88{
 89	put_unaligned_be64(lba, &cdb[2]);
 90	put_unaligned_be32(sectors, &cdb[10]);
 91}
 92
 93/*
 94 *	split_cdb_XX_32():
 95 *
 96 * 	64-bit LBA w/ 32-bit SECTORS such as READ_32, WRITE_32 and emulated XDWRITEREAD_32
 97 */
 98void split_cdb_XX_32(
 99	unsigned long long lba,
100	u32 sectors,
101	unsigned char *cdb)
102{
103	put_unaligned_be64(lba, &cdb[12]);
104	put_unaligned_be32(sectors, &cdb[28]);
105}