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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10593 6f19259b-4bc3-4df7-8a09-765794883524
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/** @file
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AsmWriteMsr64 function
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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/**
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Writes a 64-bit value to a Machine Specific Register(MSR), and returns the
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value.
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Writes the 64-bit value specified by Value to the MSR specified by Index. The
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64-bit value written to the MSR is returned. No parameter checking is
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performed on Index or Value, and some of these may cause CPU exceptions. The
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caller must either guarantee that Index and Value are valid, or the caller
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must establish proper exception handlers. This function is only available on
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IA-32 and x64.
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@param Index The 32-bit MSR index to write.
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@param Value The 64-bit value to write to the MSR.
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@return Value
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**/
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UINT64
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EFIAPI
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AsmWriteMsr64 (
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IN UINT32 Index,
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IN UINT64 Value
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)
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{
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_asm {
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mov edx, dword ptr [Value + 4]
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mov eax, dword ptr [Value + 0]
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mov ecx, Index
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wrmsr
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}
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}
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