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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: niu_ncu_interface.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 | // ========== Copyright Header Begin ========================================== | |
36 | // | |
37 | // OpenSPARC T2 Processor File: niu_ncu_interface.cpp | |
38 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved | |
39 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. | |
40 | // | |
41 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
42 | // | |
43 | // This program is free software; you can redistribute it and/or modify | |
44 | // it under the terms of the GNU General Public License as published by | |
45 | // the Free Software Foundation; version 2 of the License. | |
46 | // | |
47 | // This program is distributed in the hope that it will be useful, | |
48 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
49 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
50 | // GNU General Public License for more details. | |
51 | // | |
52 | // You should have received a copy of the GNU General Public License | |
53 | // along with this program; if not, write to the Free Software | |
54 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
55 | // | |
56 | // For the avoidance of doubt, and except that if any non-GPL license | |
57 | // choice is available it will apply instead, Sun elects to use only | |
58 | // the General Public License version 2 (GPLv2) at this time for any | |
59 | // software where a choice of GPL license versions is made | |
60 | // available with the language indicating that GPLv2 or any later version | |
61 | // may be used, or where a choice of which version of the GPL is applied is | |
62 | // otherwise unspecified. | |
63 | // | |
64 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
65 | // CA 95054 USA or visit www.sun.com if you need additional information or | |
66 | // have any questions. | |
67 | // | |
68 | // ========== Copyright Header End ============================================ | |
69 | #include <systemc.h> | |
70 | ||
71 | #include "niu_ncu_interface.h" | |
72 | #include "sharedmem.h" | |
73 | ||
74 | extern "C" void vcs_atexit(void(*pfun)(int code)); | |
75 | ||
76 | sharedmem *shmem = NULL; | |
77 | ||
78 | niu_ncu_interface::niu_ncu_interface(sc_module_name) { | |
79 | SC_METHOD(ncu_interface); | |
80 | sensitive << clk.pos(); | |
81 | ||
82 | ncu_niu_vld_d = false; | |
83 | ncu_niu_stall_d = false; | |
84 | niu_ncu_stall_d = false; | |
85 | ncu_word = 0; | |
86 | niu_word = 0; | |
87 | niu_int_word = 0; | |
88 | reset = 1; | |
89 | } | |
90 | ||
91 | void niu_ncu_interface::ncu_interface() { | |
92 | if(reset) { | |
93 | niu_rd.write(false); | |
94 | niu_rd_addr.write(0); | |
95 | niu_rd_data.write(0); | |
96 | niu_ncu_stall.write(false); | |
97 | reset = 0; | |
98 | } | |
99 | ||
100 | ||
101 | //When an interrupt is received from NIU, send it to NCU | |
102 | if(shmem) { | |
103 | unsigned int data; | |
104 | shmem->receiveInterrupt(data); | |
105 | if(data) { | |
106 | niu_interrupt.range(63,57) = 0; | |
107 | niu_interrupt.range(56,51) = 0; | |
108 | niu_interrupt.range(50,19) = 0; | |
109 | niu_interrupt.range(18,10) = data & 0x1ff; | |
110 | niu_interrupt.range(9,7) = 0; | |
111 | niu_interrupt.range(6,4) = 0; | |
112 | niu_interrupt.range(3,0) = "1000"; | |
113 | niu_int_word = 3; | |
114 | } | |
115 | } | |
116 | ||
117 | if(niu_int_word > 1) { | |
118 | niu_ncu_vld.write(true); | |
119 | switch(niu_int_word) { | |
120 | case 3: niu_ncu_data.write(niu_data.get_word(0)); break; | |
121 | case 2: niu_ncu_data.write(niu_data.get_word(1)); break; | |
122 | } | |
123 | niu_int_word--; | |
124 | } else if(niu_int_word == 1) { | |
125 | niu_ncu_vld.write(false); | |
126 | niu_int_word--; | |
127 | } | |
128 | ||
129 | //When the response to ncu is ready, send it to NCU | |
130 | //Total of 5 cycles; 4 x 32-bits + 1 idle cycle | |
131 | if(niu_word > 1) { | |
132 | niu_ncu_vld.write(true); | |
133 | switch(niu_word) { | |
134 | case 5: niu_ncu_data.write(niu_data.get_word(0)); break; | |
135 | case 4: niu_ncu_data.write(niu_data.get_word(1)); break; | |
136 | case 3: niu_ncu_data.write(niu_data.get_word(2)); break; | |
137 | case 2: niu_ncu_data.write(niu_data.get_word(3)); | |
138 | niu_rd.write(true); | |
139 | niu_rd_addr.write(niu_data.range(41,15)); | |
140 | niu_rd_data.write(niu_data.range(127,64)); | |
141 | break; | |
142 | } | |
143 | niu_word--; | |
144 | } else if(niu_word == 1) { | |
145 | niu_ncu_vld.write(false); | |
146 | niu_rd.write(false); | |
147 | niu_word--; | |
148 | } | |
149 | ||
150 | //When ncu_niu_vld deasserts, the request is complete | |
151 | //Send the request to the niu model, and wait for the response | |
152 | if(!ncu_niu_vld.read() && ncu_niu_vld_d) { | |
153 | unsigned long int mem[4]; | |
154 | for(int i=0;i<4;i++) mem[i] = ncu_data.get_word(i); | |
155 | ||
156 | shmem->deliver_ncu_req(mem, 16); | |
157 | //shmem->receive_niu_res(mem, 16); | |
158 | ||
159 | for(int i=0;i<4;i++) { | |
160 | niu_data.set_word(i, mem[i]); | |
161 | niu_data.set_cword(i, 0); //no x or z | |
162 | } | |
163 | if(ncu_data.range(3,0) == "0100") { | |
164 | niu_data.range(3,0) = "0001"; | |
165 | niu_word = 5; | |
166 | } | |
167 | } | |
168 | ||
169 | //Process the request from NCU to NIU | |
170 | //A complete request takes 4 cycles, each with 32-bit data | |
171 | if(!ncu_niu_vld.read()) { | |
172 | ncu_word = 0; | |
173 | ncu_data = 0; | |
174 | } else { | |
175 | if(!niu_ncu_stall_d) { | |
176 | switch(ncu_word) { | |
177 | case 0: ncu_data.range(31,0) = ncu_niu_data.read(); break; | |
178 | case 1: ncu_data.range(63,32) = ncu_niu_data.read(); break; | |
179 | case 2: ncu_data.range(95,64) = ncu_niu_data.read(); break; | |
180 | case 3: ncu_data.range(127,96) = ncu_niu_data.read(); break; | |
181 | } | |
182 | ncu_word++; | |
183 | } | |
184 | } | |
185 | ||
186 | //Delay ncu_niu_stall, niu_ncu_stall, and ncu_niu_vld signals for a cycle | |
187 | ncu_niu_stall_d = ncu_niu_stall.read(); | |
188 | niu_ncu_stall_d = niu_ncu_stall.read(); | |
189 | ncu_niu_vld_d = ncu_niu_vld.read(); | |
190 | } | |
191 | ||
192 | ||
193 |