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; ReadDr5.Asm 15; 16; Abstract: 17; 18; AsmReadDr5 function 19; 20; Notes: 21; 22;------------------------------------------------------------------------------ 23 24 SECTION .text 25 26;------------------------------------------------------------------------------ 27; UINTN 28; EFIAPI 29; AsmReadDr5 ( 30; VOID 31; ); 32;------------------------------------------------------------------------------ 33global ASM_PFX(AsmReadDr5) 34ASM_PFX(AsmReadDr5): 35 ; 36 ; DR5 is alias to DR7 only if DE (in CR4) is cleared. Otherwise, reading 37 ; this register will cause a #UD exception. 38 ; 39 ; MS assembler doesn't support this instruction since no one would use it 40 ; under normal circustances. Here opcode is used. 41 ; 42 DB 0xf, 0x21, 0xe8 43 ret 44 45