UefiCpuPkg/CpuDxe/Ia32/IvtAsm.asm

   1       TITLE   IvtAsm.asm:
   2 ;------------------------------------------------------------------------------
   3 ;*
   4 ;*   Copyright 2008 - 2009, Intel Corporation
   5 ;*   All rights reserved. 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 ;*    IvtAsm.asm
  14 ;*
  15 ;*   Abstract:
  16 ;*
  17 ;------------------------------------------------------------------------------
  18
  19 #include <Base.h>
  20
  21 #ifdef MDE_CPU_IA32
  22     .686
  23     .model  flat,C
  24 #endif
  25     .code
  26
  27 ;------------------------------------------------------------------------------
  28 ;  Generic IDT Vector Handlers for the Host. They are all the same so they
  29 ;  will compress really well.
  30 ;
  31 ;  By knowing the return address for Vector 00 you can can calculate the
  32 ;  vector number by looking at the call CommonInterruptEntry return address.
  33 ;  (return address - (AsmIdtVector00 + 5))/8 == IDT index
  34 ;
  35 ;------------------------------------------------------------------------------
  36
  37 EXTRN CommonInterruptEntry:PROC
  38
  39 ALIGN   8
  40
  41 PUBLIC  AsmIdtVector00
  42
  43 AsmIdtVector00 LABEL BYTE
  44 REPEAT  256
  45     call    CommonInterruptEntry
  46     dw      ($ - AsmIdtVector00 - 5) / 8 ; vector number
  47     nop
  48 ENDM
  49
  50 END
  51