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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 |