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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: iommu_demap.v | |
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 "defines.vh" | |
36 | `include "dispmonDefines.vh" | |
37 | ||
38 | module iommu_demap (); | |
39 | ||
40 | ||
41 | ||
42 | wire clk = `CPU.dmu.dmc.mmu.clk; | |
43 | wire [63:0] nxt_vld; | |
44 | wire [63:0] ptb2vtb_inv; | |
45 | wire csr2ptb_inv; | |
46 | integer i; | |
47 | ||
48 | reg csr2ptb_inv_local; | |
49 | reg enable; | |
50 | ||
51 | ||
52 | assign csr2ptb_inv = `CPU.dmu.dmc.mmu.csr.csr2ptb_inv ; | |
53 | assign nxt_vld = `CPU.dmu.dmc.mmu.vtb.nxt_vld ; | |
54 | assign ptb2vtb_inv = `CPU.dmu.dmc.mmu.vtb.ptb2vtb_inv ; | |
55 | ||
56 | initial | |
57 | begin | |
58 | enable = 0; | |
59 | i = 0; | |
60 | if ($test$plusargs("turn_on_iommu_demap")) enable = 1; | |
61 | end | |
62 | ||
63 | ||
64 | ||
65 | ||
66 | always @ (posedge clk) | |
67 | begin | |
68 | csr2ptb_inv_local <= #1 csr2ptb_inv; | |
69 | if(csr2ptb_inv_local == 1 ) | |
70 | begin | |
71 | for(i=0;i<63;i=i+1) | |
72 | begin | |
73 | if(ptb2vtb_inv[i] == 1) begin | |
74 | if ((nxt_vld[i] == 0) && (enable ==1)) | |
75 | begin | |
76 | $dispmon("IOMMU_DEMAP", `ALWAYS, "invalidating %d entry",i); | |
77 | end | |
78 | else if (nxt_vld[i] == 1) begin | |
79 | $dispmon("IOMMU_DEMAP", `ERROR, "valid bit in not zero for %d entry",i); | |
80 | end | |
81 | end | |
82 | end | |
83 | end | |
84 | ||
85 | end | |
86 | ||
87 | endmodule |