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1 | /* |
2 | * ========== Copyright Header Begin ========================================== | |
3 | * | |
4 | * OpenSPARC T2 Processor File: data_scrambler.h | |
5 | * Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved | |
6 | * 4150 Network Circle, Santa Clara, California 95054, U.S.A. | |
7 | * | |
8 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; version 2 of the License. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * For the avoidance of doubt, and except that if any non-GPL license | |
24 | * choice is available it will apply instead, Sun elects to use only | |
25 | * the General Public License version 2 (GPLv2) at this time for any | |
26 | * software where a choice of GPL license versions is made | |
27 | * available with the language indicating that GPLv2 or any later version | |
28 | * may be used, or where a choice of which version of the GPL is applied is | |
29 | * otherwise unspecified. | |
30 | * | |
31 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
32 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
33 | * have any questions. | |
34 | * | |
35 | * | |
36 | * ========== Copyright Header End ============================================ | |
37 | */ | |
38 | // ========== Copyright Header Begin ========================================== | |
39 | // | |
40 | // OpenSPARC T2 Processor File: data_scrambler.h | |
41 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved | |
42 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. | |
43 | // | |
44 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
45 | // | |
46 | // This program is free software; you can redistribute it and/or modify | |
47 | // it under the terms of the GNU General Public License as published by | |
48 | // the Free Software Foundation; version 2 of the License. | |
49 | // | |
50 | // This program is distributed in the hope that it will be useful, | |
51 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
52 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
53 | // GNU General Public License for more details. | |
54 | // | |
55 | // You should have received a copy of the GNU General Public License | |
56 | // along with this program; if not, write to the Free Software | |
57 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
58 | // | |
59 | // For the avoidance of doubt, and except that if any non-GPL license | |
60 | // choice is available it will apply instead, Sun elects to use only | |
61 | // the General Public License version 2 (GPLv2) at this time for any | |
62 | // software where a choice of GPL license versions is made | |
63 | // available with the language indicating that GPLv2 or any later version | |
64 | // may be used, or where a choice of which version of the GPL is applied is | |
65 | // otherwise unspecified. | |
66 | // | |
67 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
68 | // CA 95054 USA or visit www.sun.com if you need additional information or | |
69 | // have any questions. | |
70 | // | |
71 | // ========== Copyright Header End ============================================ | |
72 | #ifndef INC_data_scrambler_h__ | |
73 | #define INC_data_scrambler_h__ | |
74 | ||
75 | #ifndef __EDG__ | |
76 | ||
77 | #include "systemc.h" | |
78 | #define LOG_SERVICE | |
79 | #include "pcie_common/logger.hpp" | |
80 | #include "pl/encode_map.h" | |
81 | ||
82 | #define LINK_WIDTH 8 | |
83 | ||
84 | USING_NAMESPACE(Logger) | |
85 | ||
86 | /// Static scrambler class | |
87 | /// As the name suggests, it scrambles an 8 bit input | |
88 | /// according to the PCIex standard LFSR | |
89 | ||
90 | class data_scrambler | |
91 | { | |
92 | public : | |
93 | bool init_done; | |
94 | bool scramble_enable; | |
95 | bool start_scramble_reg[LINK_WIDTH]; | |
96 | ||
97 | static data_scrambler *scramble() | |
98 | { | |
99 | if(scrambler == NULL) | |
100 | scrambler = new data_scrambler(); | |
101 | return scrambler; | |
102 | } | |
103 | ||
104 | static data_scrambler *descramble() | |
105 | { | |
106 | if(descrambler == NULL) | |
107 | descrambler = new data_scrambler(); | |
108 | return descrambler; | |
109 | } | |
110 | ||
111 | protected : data_scrambler() | |
112 | { | |
113 | int i; | |
114 | for(i=0;i<LINK_WIDTH;i++) | |
115 | { | |
116 | lfsr[i] = 0xffff; | |
117 | start_scramble_reg[i] = 0; | |
118 | } | |
119 | scramble_enable = 0; | |
120 | init_done = 0; | |
121 | } | |
122 | ||
123 | public : | |
124 | int data_scrambler::scramble_descramble_all(int inbyte,int is_scrambler,int is_control) | |
125 | { | |
126 | int i,outbyte; | |
127 | for(i=0;i<LINK_WIDTH;i++) | |
128 | outbyte = scramble_descramble(inbyte,is_scrambler,is_control,i); | |
129 | ||
130 | return outbyte; | |
131 | ||
132 | } | |
133 | ||
134 | public : | |
135 | int data_scrambler::scramble_descramble(int inbyte,int is_scrambler,int is_control,int lane_num) | |
136 | { | |
137 | static int scrambit[16][LINK_WIDTH]; | |
138 | static int bit[16][LINK_WIDTH]; | |
139 | static int bit_out[16][LINK_WIDTH]; | |
140 | int i, outbyte; | |
141 | if(inbyte == COM && (is_control == 1)) | |
142 | { | |
143 | lfsr[lane_num] = 0xffff; | |
144 | return(COM); | |
145 | } | |
146 | ||
147 | if(inbyte == SKP && (is_scrambler == 0) && (is_control == 1)) | |
148 | { | |
149 | return(SKP); | |
150 | } | |
151 | for(i=0 ; i< 16; i++) | |
152 | { | |
153 | bit[i][lane_num] = (lfsr[lane_num] >> i) &1; | |
154 | } | |
155 | ||
156 | for(i=0 ; i<8 ; i++) | |
157 | { | |
158 | scrambit[i][lane_num] = (inbyte >> i) &1; | |
159 | } | |
160 | ||
161 | if(start_scramble_reg[lane_num]) | |
162 | { | |
163 | scrambit[0][lane_num] ^= bit[15][lane_num]; | |
164 | scrambit[1][lane_num] ^= bit[14][lane_num]; | |
165 | scrambit[2][lane_num] ^= bit[13][lane_num]; | |
166 | scrambit[3][lane_num] ^= bit[12][lane_num]; | |
167 | scrambit[4][lane_num] ^= bit[11][lane_num]; | |
168 | scrambit[5][lane_num] ^= bit[10][lane_num]; | |
169 | scrambit[6][lane_num] ^= bit[9][lane_num]; | |
170 | scrambit[7][lane_num] ^= bit[8][lane_num]; | |
171 | } | |
172 | ||
173 | // Now advance the LFSR 8 serial clocks | |
174 | bit_out[ 0][lane_num] = bit[ 8][lane_num]; | |
175 | bit_out[ 1][lane_num] = bit[ 9][lane_num]; | |
176 | bit_out[ 2][lane_num] = bit[10][lane_num]; | |
177 | bit_out[ 3][lane_num] = bit[11][lane_num] ^ bit[ 8][lane_num]; | |
178 | bit_out[ 4][lane_num] = bit[12][lane_num] ^ bit[ 9][lane_num] ^ bit[ 8][lane_num]; | |
179 | bit_out[ 5][lane_num] = bit[13][lane_num] ^ bit[10][lane_num] ^ bit[ 9][lane_num] ^ bit[ 8][lane_num]; | |
180 | bit_out[ 6][lane_num] = bit[14][lane_num] ^ bit[11][lane_num] ^ bit[10][lane_num] ^ bit[ 9][lane_num]; | |
181 | bit_out[ 7][lane_num] = bit[15][lane_num] ^ bit[12][lane_num] ^ bit[11][lane_num] ^ bit[10][lane_num]; | |
182 | bit_out[ 8][lane_num] = bit[ 0][lane_num] ^ bit[13][lane_num] ^ bit[12][lane_num] ^ bit[11][lane_num]; | |
183 | bit_out[ 9][lane_num] = bit[ 1][lane_num] ^ bit[14][lane_num] ^ bit[13][lane_num] ^ bit[12][lane_num]; | |
184 | bit_out[10][lane_num] = bit[ 2][lane_num] ^ bit[15][lane_num] ^ bit[14][lane_num] ^ bit[13][lane_num]; | |
185 | bit_out[11][lane_num] = bit[ 3][lane_num] ^ bit[15][lane_num] ^ bit[14][lane_num]; | |
186 | bit_out[12][lane_num] = bit[ 4][lane_num] ^ bit[15][lane_num]; | |
187 | bit_out[13][lane_num] = bit[ 5][lane_num]; | |
188 | bit_out[14][lane_num] = bit[ 6][lane_num]; | |
189 | bit_out[15][lane_num] = bit[ 7][lane_num]; | |
190 | ||
191 | lfsr[lane_num] = 0; | |
192 | for (i=0; i <16; i++) // convert the LFSR back to an integer | |
193 | lfsr[lane_num] += (bit_out[i][lane_num] << i); | |
194 | outbyte = 0; | |
195 | for (i= 0; i<8; i++) // convert data back to an integer | |
196 | outbyte += (scrambit[i][lane_num] << i); | |
197 | ||
198 | wait(SC_ZERO_TIME); | |
199 | ||
200 | return outbyte; | |
201 | } | |
202 | ||
203 | void reset() | |
204 | { | |
205 | int i; | |
206 | for(i=0;i<LINK_WIDTH;i++) | |
207 | { | |
208 | lfsr[i] = 0xffff; | |
209 | start_scramble_reg[i] = 0; | |
210 | } | |
211 | scramble_enable = 0; | |
212 | } | |
213 | ||
214 | unsigned short get_lfsr(int lane_num) | |
215 | { | |
216 | return lfsr[lane_num]; | |
217 | } | |
218 | ||
219 | void set_lfsr(unsigned short val,int lane_num) | |
220 | { | |
221 | lfsr[lane_num] = val; | |
222 | } | |
223 | ||
224 | private : | |
225 | static data_scrambler *scrambler; | |
226 | static data_scrambler *descrambler; | |
227 | unsigned short lfsr[LINK_WIDTH]; | |
228 | }; | |
229 | ||
230 | #endif // __EDG__ | |
231 | ||
232 | #endif //INC_data_scrambler_h__ |