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f1baef62 1/** @file\r
2 CpuBreakpoint function.\r
3\r
dc4d4230 4 Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>\r
9344f092 5 SPDX-License-Identifier: BSD-2-Clause-Patent\r
f1baef62 6\r
7**/\r
8\r
42eedea9 9/**\r
10 Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.\r
11**/\r
7e43ed89 12\r
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13#include <Library/RegisterFilterLib.h>\r
14\r
2f88bd3a
MK
15void\r
16__writemsr (\r
17 unsigned long Register,\r
18 unsigned __int64 Value\r
19 );\r
f1baef62 20\r
21#pragma intrinsic(__writemsr)\r
22\r
42eedea9 23/**\r
24 Write data to MSR.\r
25\r
127010dd 26 @param Index The register index of MSR.\r
42eedea9 27 @param Value Data wants to be written.\r
28\r
29 @return Value written to MSR.\r
30\r
31**/\r
f1baef62 32UINT64\r
33EFIAPI\r
34AsmWriteMsr64 (\r
35 IN UINT32 Index,\r
36 IN UINT64 Value\r
37 )\r
38{\r
2f88bd3a 39 BOOLEAN Flag;\r
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40\r
41 Flag = FilterBeforeMsrWrite (Index, &Value);\r
42 if (Flag) {\r
43 __writemsr (Index, Value);\r
44 }\r
2f88bd3a 45\r
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46 FilterAfterMsrWrite (Index, &Value);\r
47\r
f1baef62 48 return Value;\r
49}\r