/** @file | |
AsmReadDr4 function | |
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
This program and the accompanying materials | |
are licensed and made available under the terms and conditions of the BSD License | |
which accompanies this distribution. The full text of the license may be found at | |
http://opensource.org/licenses/bsd-license.php. | |
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
**/ | |
/** | |
Reads the current value of Debug Register 4 (DR4). | |
Reads and returns the current value of DR4. This function is only available | |
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on | |
x64. | |
@return The value of Debug Register 4 (DR4). | |
**/ | |
UINTN | |
EFIAPI | |
AsmReadDr4 ( | |
VOID | |
) | |
{ | |
__asm { | |
_emit 0x0f | |
_emit 0x21 | |
_emit 0xe0 | |
} | |
} | |