| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: calculate_lcrc.cpp |
| 4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
| 5 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. |
| 6 | // |
| 7 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 8 | // |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; version 2 of the License. |
| 12 | // |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | // |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | // |
| 22 | // For the avoidance of doubt, and except that if any non-GPL license |
| 23 | // choice is available it will apply instead, Sun elects to use only |
| 24 | // the General Public License version 2 (GPLv2) at this time for any |
| 25 | // software where a choice of GPL license versions is made |
| 26 | // available with the language indicating that GPLv2 or any later version |
| 27 | // may be used, or where a choice of which version of the GPL is applied is |
| 28 | // otherwise unspecified. |
| 29 | // |
| 30 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 31 | // CA 95054 USA or visit www.sun.com if you need additional information or |
| 32 | // have any questions. |
| 33 | // |
| 34 | // ========== Copyright Header End ============================================ |
| 35 | #include "dll_top.hpp" |
| 36 | |
| 37 | namespace pcie { |
| 38 | |
| 39 | /** |
| 40 | This function calculates the LCRC value |
| 41 | **/ |
| 42 | sc_uint<32> dll_top::calculate_lcrc(RefPciePacket received_packet,int pkt_begin,int pkt_end) |
| 43 | { |
| 44 | int index,byte_index;; |
| 45 | sc_uint<32> tmp_lcrc; |
| 46 | sc_uint<8> byte; |
| 47 | sc_uint<32> lcrc_mapped; |
| 48 | |
| 49 | /// Resetting the initial lcrc value |
| 50 | lcrc = 0xffffffff; |
| 51 | |
| 52 | for(byte_index=pkt_begin; byte_index < pkt_end; byte_index++) |
| 53 | { |
| 54 | byte = received_packet->get_byte(byte_index); |
| 55 | for (index=0; index < 8; index++) |
| 56 | { |
| 57 | tmp_lcrc = lcrc; |
| 58 | lcrc[0] = byte[index] ^ tmp_lcrc[31]; |
| 59 | lcrc[1] = byte[index] ^ tmp_lcrc[0] ^ tmp_lcrc[31]; |
| 60 | lcrc[2] = byte[index] ^ tmp_lcrc[1] ^ tmp_lcrc[31]; |
| 61 | lcrc[3] = tmp_lcrc[2]; |
| 62 | lcrc[4] = byte[index] ^ tmp_lcrc[3] ^ tmp_lcrc[31]; |
| 63 | lcrc[5] = byte[index] ^ tmp_lcrc[4] ^ tmp_lcrc[31]; |
| 64 | lcrc[6] = tmp_lcrc[5]; |
| 65 | lcrc[7] = byte[index] ^ tmp_lcrc[6] ^ tmp_lcrc[31]; |
| 66 | lcrc[8] = byte[index] ^ tmp_lcrc[7] ^ tmp_lcrc[31]; |
| 67 | lcrc[9] = tmp_lcrc[8]; |
| 68 | lcrc[10] = byte[index] ^ tmp_lcrc[9] ^ tmp_lcrc[31]; |
| 69 | lcrc[11] = byte[index] ^ tmp_lcrc[10] ^ tmp_lcrc[31]; |
| 70 | lcrc[12] = byte[index] ^ tmp_lcrc[11] ^ tmp_lcrc[31]; |
| 71 | lcrc[13] = tmp_lcrc[12]; |
| 72 | lcrc[14] = tmp_lcrc[13]; |
| 73 | lcrc[15] = tmp_lcrc[14]; |
| 74 | lcrc[16] = byte[index] ^ tmp_lcrc[15] ^ tmp_lcrc[31]; |
| 75 | lcrc[17] = tmp_lcrc[16]; |
| 76 | lcrc[18] = tmp_lcrc[17]; |
| 77 | lcrc[19] = tmp_lcrc[18]; |
| 78 | lcrc[20] = tmp_lcrc[19]; |
| 79 | lcrc[21] = tmp_lcrc[20]; |
| 80 | lcrc[22] = byte[index] ^ tmp_lcrc[21] ^ tmp_lcrc[31]; |
| 81 | lcrc[23] = byte[index] ^ tmp_lcrc[22] ^ tmp_lcrc[31]; |
| 82 | lcrc[24] = tmp_lcrc[23]; |
| 83 | lcrc[25] = tmp_lcrc[24]; |
| 84 | lcrc[26] = byte[index] ^ tmp_lcrc[25] ^ tmp_lcrc[31]; |
| 85 | lcrc[27] = tmp_lcrc[26]; |
| 86 | lcrc[28] = tmp_lcrc[27]; |
| 87 | lcrc[29] = tmp_lcrc[28]; |
| 88 | lcrc[30] = tmp_lcrc[29]; |
| 89 | lcrc[31] = tmp_lcrc[30]; |
| 90 | |
| 91 | lcrc_mapped[0] = ~lcrc[7]; |
| 92 | lcrc_mapped[1] = ~lcrc[6]; |
| 93 | lcrc_mapped[2] = ~lcrc[5]; |
| 94 | lcrc_mapped[3] = ~lcrc[4]; |
| 95 | lcrc_mapped[4] = ~lcrc[3]; |
| 96 | lcrc_mapped[5] = ~lcrc[2]; |
| 97 | lcrc_mapped[6] = ~lcrc[1]; |
| 98 | lcrc_mapped[7] = ~lcrc[0]; |
| 99 | |
| 100 | lcrc_mapped[8] = ~lcrc[15]; |
| 101 | lcrc_mapped[9] = ~lcrc[14]; |
| 102 | lcrc_mapped[10] = ~lcrc[13]; |
| 103 | lcrc_mapped[11] = ~lcrc[12]; |
| 104 | lcrc_mapped[12] = ~lcrc[11]; |
| 105 | lcrc_mapped[13] = ~lcrc[10]; |
| 106 | lcrc_mapped[14] = ~lcrc[9]; |
| 107 | lcrc_mapped[15] = ~lcrc[8]; |
| 108 | |
| 109 | lcrc_mapped[16] = ~lcrc[23]; |
| 110 | lcrc_mapped[17] = ~lcrc[22]; |
| 111 | lcrc_mapped[18] = ~lcrc[21]; |
| 112 | lcrc_mapped[19] = ~lcrc[20]; |
| 113 | lcrc_mapped[20] = ~lcrc[19]; |
| 114 | lcrc_mapped[21] = ~lcrc[18]; |
| 115 | lcrc_mapped[22] = ~lcrc[17]; |
| 116 | lcrc_mapped[23] = ~lcrc[16]; |
| 117 | |
| 118 | lcrc_mapped[24] = ~lcrc[31]; |
| 119 | lcrc_mapped[25] = ~lcrc[30]; |
| 120 | lcrc_mapped[26] = ~lcrc[29]; |
| 121 | lcrc_mapped[27] = ~lcrc[28]; |
| 122 | lcrc_mapped[28] = ~lcrc[27]; |
| 123 | lcrc_mapped[29] = ~lcrc[26]; |
| 124 | lcrc_mapped[30] = ~lcrc[25]; |
| 125 | lcrc_mapped[31] = ~lcrc[24]; |
| 126 | }// for |
| 127 | } // for |
| 128 | return lcrc_mapped; |
| 129 | }// void calculate_lcrc |
| 130 | } |
| 131 | |