1 /** @file 2 AsmWriteIdtr function 3 4 Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 16 #include "BaseLibInternals.h" 17 18 /** 19 Writes the current Interrupt Descriptor Table Register(GDTR) descriptor. 20 21 Writes the current IDTR descriptor and returns it in Idtr. This function is 22 only available on IA-32 and x64. 23 24 @param Idtr The pointer to a IDTR descriptor. 25 26 **/ 27 VOID 28 EFIAPI InternalX86WriteIdtr(IN CONST IA32_DESCRIPTOR * Idtr)29InternalX86WriteIdtr ( 30 IN CONST IA32_DESCRIPTOR *Idtr 31 ) 32 { 33 _asm { 34 mov eax, Idtr 35 pushfd 36 cli 37 lidt fword ptr [eax] 38 popfd 39 } 40 } 41 42