Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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 | } |