| ;------------------------------------------------------------------------------ | |
| ; | |
| ; 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 | |