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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 |