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1 /** @file
2   AsmReadDr0 function
3 
4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5   This program and the accompanying materials
6   are licensed and made available under the terms and conditions of the BSD License
7   which accompanies this distribution.  The full text of the license may be found at
8   http://opensource.org/licenses/bsd-license.php.
9 
10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12 
13 **/
14 
15 
16 
17 
18 /**
19   Reads the current value of Debug Register 0 (DR0).
20 
21   Reads and returns the current value of DR0. This function is only available
22   on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
23   x64.
24 
25   @return The value of Debug Register 0 (DR0).
26 
27 **/
28 UINTN
29 EFIAPI
AsmReadDr0(VOID)30 AsmReadDr0 (
31   VOID
32   )
33 {
34   __asm {
35     mov     eax, dr0
36   }
37 }
38 
39