1;------------------------------------------------------------------------------
2;
3; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
4; This program and the accompanying materials
5; are licensed and made available under the terms and conditions of the BSD License
6; which accompanies this distribution.  The full text of the license may be found at
7; http://opensource.org/licenses/bsd-license.php.
8;
9; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11;
12; Module Name:
13;
14;   ReadDr4.Asm
15;
16; Abstract:
17;
18;   AsmReadDr4 function
19;
20; Notes:
21;
22;------------------------------------------------------------------------------
23
24    DEFAULT REL
25    SECTION .text
26
27;------------------------------------------------------------------------------
28; UINTN
29; EFIAPI
30; AsmReadDr4 (
31;   VOID
32;   );
33;------------------------------------------------------------------------------
34global ASM_PFX(AsmReadDr4)
35ASM_PFX(AsmReadDr4):
36    ;
37    ; There's no obvious reason to access this register, since it's aliased to
38    ; DR7 when DE=0 or an exception generated when DE=1
39    ;
40    DB      0xf, 0x21, 0xe0
41    ret
42
43