IntelFrameworkModulePkg/Csm/LegacyBiosDxe/IA32/InterruptTable.nasm

   1 ;; @file
   2 ;  Interrupt Redirection Template
   3 ;
   4 ; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
   5 ;
   6 ; This program and the accompanying materials
   7 ; are licensed and made available under the terms and conditions
   8 ; of the BSD License which accompanies this distribution.  The
   9 ; full text of the license may be found at
  10 ; http://opensource.org/licenses/bsd-license.php
  11 ;
  12 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 ;
  15 ;;
  16
  17 SECTION .text
  18
  19 ;----------------------------------------------------------------------------
  20 ; Procedure:    InterruptRedirectionTemplate: Redirects interrupts 0x68-0x6F
  21 ;
  22 ; Input:        None
  23 ;
  24 ; Output:       None
  25 ;
  26 ; Prototype:    VOID
  27 ;               InterruptRedirectionTemplate (
  28 ;                                VOID
  29 ;                                );
  30 ;
  31 ; Saves:        None
  32 ;
  33 ; Modified:     None
  34 ;
  35 ; Description:  Contains the code that is copied into low memory (below 640K).
  36 ;               This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f.
  37 ;               This template must be copied into low memory, and the IDT entries
  38 ;               0x68-0x6F must be point to the low memory copy of this code.  Each
  39 ;               entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily
  40 ;               computed.
  41 ;
  42 ;----------------------------------------------------------------------------
  43
  44 global ASM_PFX(InterruptRedirectionTemplate)
  45 ASM_PFX(InterruptRedirectionTemplate):
  46   int     0x8
  47   DB      0xcf          ; IRET
  48   nop
  49   int     0x9
  50   DB      0xcf          ; IRET
  51   nop
  52   int     0xa
  53   DB      0xcf          ; IRET
  54   nop
  55   int     0xb
  56   DB      0xcf          ; IRET
  57   nop
  58   int     0xc
  59   DB      0xcf          ; IRET
  60   nop
  61   int     0xd
  62   DB      0xcf          ; IRET
  63   nop
  64   int     0xe
  65   DB      0xcf          ; IRET
  66   nop
  67   int     0xf
  68   DB      0xcf          ; IRET
  69   nop
  70