EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/Ia32/WriteIdt.asm

   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 ;   WriteIdt.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetIdtBase function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .586p
  25     .model  flat,C
  26     .mmx
  27     .code
  28
  29 ;------------------------------------------------------------------------------
  30 ; void
  31 ; SetIdtBase (
  32 ;   UINT32  IdtBase,
  33 ;   UINT16  IdtLimit
  34 ;   )
  35 ;
  36 ; Abstract: Set IDTR with the given physical address
  37 ;
  38 SetIdtBase      PROC    C PUBLIC IdtBase:DWORD, IdtLimit:WORD
  39                 LOCAL   IdtrBuf:FWORD
  40
  41                 mov     eax, IdtBase
  42                 mov     cx, IdtLimit
  43                 mov     DWORD PTR IdtrBuf + 2, eax                  ; write IDT base address
  44                 mov     WORD  PTR IdtrBuf, cx                        ; write ITD limit
  45                 lidt    FWORD PTR IdtrBuf
  46                 ret
  47 SetIdtBase      ENDP
  48
  49      END