| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: calculate_dllp_crc.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 crc in the DLL packet |
| 41 | **/ |
| 42 | sc_uint<16> dll_top::calculate_dllp_crc(RefPciePacket received_packet,int pkt_begin, int pkt_end) |
| 43 | { |
| 44 | int index, byte_index; |
| 45 | sc_uint<8> byte; |
| 46 | sc_uint<16> tmp_dllp_crc; |
| 47 | sc_uint<16> dllp_crc_mapped; |
| 48 | |
| 49 | /// Reset initial dllp crc value |
| 50 | dllp_crc = 0xffff; |
| 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_dllp_crc = dllp_crc; |
| 58 | dllp_crc[0] = byte[index] ^ tmp_dllp_crc[15]; |
| 59 | dllp_crc[1] = tmp_dllp_crc[0] ^ tmp_dllp_crc[15] ^ byte[index]; |
| 60 | dllp_crc[2] = tmp_dllp_crc[1]; |
| 61 | dllp_crc[3] = tmp_dllp_crc[2] ^ tmp_dllp_crc[15] ^ byte[index];; |
| 62 | dllp_crc[4] = tmp_dllp_crc[3] ; |
| 63 | dllp_crc[5] = tmp_dllp_crc[4]; |
| 64 | dllp_crc[6] = tmp_dllp_crc[5]; |
| 65 | dllp_crc[7] = tmp_dllp_crc[6]; |
| 66 | dllp_crc[8] = tmp_dllp_crc[7]; |
| 67 | dllp_crc[9] = tmp_dllp_crc[8]; |
| 68 | dllp_crc[10] = tmp_dllp_crc[9]; |
| 69 | dllp_crc[11] = tmp_dllp_crc[10]; |
| 70 | dllp_crc[12] = tmp_dllp_crc[11] ^ tmp_dllp_crc[15] ^ byte[index]; |
| 71 | dllp_crc[13] = tmp_dllp_crc[12]; |
| 72 | dllp_crc[14] = tmp_dllp_crc[13]; |
| 73 | dllp_crc[15] = tmp_dllp_crc[14]; |
| 74 | |
| 75 | dllp_crc_mapped[0] = ~dllp_crc[7]; |
| 76 | dllp_crc_mapped[1] = ~dllp_crc[6]; |
| 77 | dllp_crc_mapped[2] = ~dllp_crc[5]; |
| 78 | dllp_crc_mapped[3] = ~dllp_crc[4]; |
| 79 | dllp_crc_mapped[4] = ~dllp_crc[3]; |
| 80 | dllp_crc_mapped[5] = ~dllp_crc[2]; |
| 81 | dllp_crc_mapped[6] = ~dllp_crc[1]; |
| 82 | dllp_crc_mapped[7] = ~dllp_crc[0]; |
| 83 | |
| 84 | dllp_crc_mapped[8] = ~dllp_crc[15]; |
| 85 | dllp_crc_mapped[9] = ~dllp_crc[14]; |
| 86 | dllp_crc_mapped[10] = ~dllp_crc[13]; |
| 87 | dllp_crc_mapped[11] = ~dllp_crc[12]; |
| 88 | dllp_crc_mapped[12] = ~dllp_crc[11]; |
| 89 | dllp_crc_mapped[13] = ~dllp_crc[10]; |
| 90 | dllp_crc_mapped[14] = ~dllp_crc[9]; |
| 91 | dllp_crc_mapped[15] = ~dllp_crc[8]; |
| 92 | |
| 93 | |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | return dllp_crc_mapped; |
| 98 | } |
| 99 | |
| 100 | } |
| 101 | |