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; WriteDr5.Asm 15; 16; Abstract: 17; 18; AsmWriteDr5 function 19; 20; Notes: 21; 22;------------------------------------------------------------------------------ 23 24 SECTION .text 25 26;------------------------------------------------------------------------------ 27; UINTN 28; EFIAPI 29; AsmWriteDr5 ( 30; IN UINTN Value 31; ); 32;------------------------------------------------------------------------------ 33global ASM_PFX(AsmWriteDr5) 34ASM_PFX(AsmWriteDr5): 35 mov eax, [esp + 4] 36 ; 37 ; DR5 is alias to DR7 only if DE (in CR4) is cleared. Otherwise, writing to 38 ; this register will cause a #UD exception. 39 ; 40 ; MS assembler doesn't support this instruction since no one would use it 41 ; under normal circustances. Here opcode is used. 42 ; 43 DB 0xf, 0x23, 0xe8 44 ret 45 46