1 /** @file
2 AsmWriteDr0 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 Writes a value to Debug Register 0 (DR0).
17
18 Writes and returns a new value to DR0. This function is only available on
19 IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
20
21 @param Value The value to write to Dr0.
22
23 @return The value written to Debug Register 0 (DR0).
24
25 **/
26 UINTN
27 EFIAPI
AsmWriteDr0(IN UINTN Value)28 AsmWriteDr0 (
29 IN UINTN Value
30 )
31 {
32 _asm {
33 mov eax, Value
34 mov dr0, eax
35 }
36 }
37
38