projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| e1f414b6 | 1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| bb817c56 HT |
3 | ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r |
| 4 | ; This program and the accompanying materials\r | |
| e1f414b6 | 5 | ; are licensed and made available under the terms and conditions of the BSD License\r |
| 6 | ; which accompanies this distribution. The full text of the license may be found at\r | |
| e4a34497 | 7 | ; http://opensource.org/licenses/bsd-license.php.\r |
| e1f414b6 | 8 | ;\r |
| 9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 11 | ;\r | |
| 12 | ; Module Name:\r | |
| 13 | ;\r | |
| 14 | ; WriteDr4.Asm\r | |
| 15 | ;\r | |
| 16 | ; Abstract:\r | |
| 17 | ;\r | |
| 18 | ; AsmWriteDr4 function\r | |
| 19 | ;\r | |
| 20 | ; Notes:\r | |
| 21 | ;\r | |
| 22 | ;------------------------------------------------------------------------------\r | |
| 23 | \r | |
| 24 | .586p\r | |
| 25 | .model flat,C\r | |
| 26 | .code\r | |
| 27 | \r | |
| 28 | ;------------------------------------------------------------------------------\r | |
| 29 | ; UINTN\r | |
| 30 | ; EFIAPI\r | |
| 31 | ; AsmWriteDr4 (\r | |
| 32 | ; IN UINTN Value\r | |
| 33 | ; );\r | |
| 34 | ;------------------------------------------------------------------------------\r | |
| 35 | AsmWriteDr4 PROC\r | |
| 36 | mov eax, [esp + 4]\r | |
| 37 | ;\r | |
| 38 | ; DR4 is alias to DR6 only if DE (in CR4) is cleared. Otherwise, writing to\r | |
| 39 | ; this register will cause a #UD exception.\r | |
| 40 | ;\r | |
| 41 | ; MS assembler doesn't support this instruction since no one would use it\r | |
| 42 | ; under normal circustances. Here opcode is used.\r | |
| 43 | ;\r | |
| 44 | DB 0fh, 23h, 0e0h\r | |
| 45 | ret\r | |
| 46 | AsmWriteDr4 ENDP\r | |
| 47 | \r | |
| 48 | END\r |