drivers/target/target_core_scdb.c

   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  */
  43 void 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  */
  58 void 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  */
  71 void 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  */
  84 void 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  */
  98 void 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 }