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5135ae9b JJ |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r | |
9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
5135ae9b JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; WriteDr4.Asm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; AsmWriteDr4 function\r | |
13 | ;\r | |
14 | ; Notes:\r | |
15 | ;\r | |
16 | ;------------------------------------------------------------------------------\r | |
17 | \r | |
18 | SECTION .text\r | |
19 | \r | |
20 | ;------------------------------------------------------------------------------\r | |
21 | ; UINTN\r | |
22 | ; EFIAPI\r | |
23 | ; AsmWriteDr4 (\r | |
24 | ; IN UINTN Value\r | |
25 | ; );\r | |
26 | ;------------------------------------------------------------------------------\r | |
27 | global ASM_PFX(AsmWriteDr4)\r | |
28 | ASM_PFX(AsmWriteDr4):\r | |
29 | mov eax, [esp + 4]\r | |
30 | ;\r | |
31 | ; DR4 is alias to DR6 only if DE (in CR4) is cleared. Otherwise, writing to\r | |
32 | ; this register will cause a #UD exception.\r | |
33 | ;\r | |
34 | ; MS assembler doesn't support this instruction since no one would use it\r | |
35 | ; under normal circustances. Here opcode is used.\r | |
36 | ;\r | |
37 | DB 0xf, 0x23, 0xe0\r | |
38 | ret\r | |
39 | \r |