blob: a1b143a2e6415d8d7a201c58f7467b02f1c72502 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
;------------------------------------------------------------------------------
;
; Copyright (c) 2006, 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.
;
; Module Name:
;
; WriteDr4.Asm
;
; Abstract:
;
; AsmWriteDr4 function
;
; Notes:
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; UINTN
; EFIAPI
; AsmWriteDr4 (
; IN UINTN Value
; );
;------------------------------------------------------------------------------
global ASM_PFX(AsmWriteDr4)
ASM_PFX(AsmWriteDr4):
mov eax, [esp + 4]
;
; DR4 is alias to DR6 only if DE (in CR4) is cleared. Otherwise, writing to
; this register will cause a #UD exception.
;
; MS assembler doesn't support this instruction since no one would use it
; under normal circustances. Here opcode is used.
;
DB 0xf, 0x23, 0xe0
ret
|
