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41 lines
912 B
41 lines
912 B
/** @file
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AsmReadDr4 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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Reads the current value of Debug Register 4 (DR4).
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Reads and returns the current value of DR4. This function is only available
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on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
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x64.
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@return The value of Debug Register 4 (DR4).
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**/
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UINTN
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EFIAPI
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AsmReadDr4 (
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VOID
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)
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{
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__asm {
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_emit 0x0f
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_emit 0x21
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_emit 0xe0
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}
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}
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