IntelFrameworkModulePkg/Csm/LegacyBiosDxe/X64/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     DEFAULT REL
  18     SECTION .text
  19
  20 ;----------------------------------------------------------------------------
  21 ; Procedure:    InterruptRedirectionTemplate: Redirects interrupts 0x68-0x6F
  22 ;
  23 ; Input:        None
  24 ;
  25 ; Output:       None
  26 ;
  27 ; Prototype:    VOID
  28 ;               InterruptRedirectionTemplate (
  29 ;                                VOID
  30 ;                                );
  31 ;
  32 ; Saves:        None
  33 ;
  34 ; Modified:     None
  35 ;
  36 ; Description:  Contains the code that is copied into low memory (below 640K).
  37 ;               This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f.
  38 ;               This template must be copied into low memory, and the IDT entries
  39 ;               0x68-0x6F must be point to the low memory copy of this code.  Each
  40 ;               entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily
  41 ;               computed.
  42 ;
  43 ;----------------------------------------------------------------------------
  44
  45 global ASM_PFX(InterruptRedirectionTemplate)
  46 ASM_PFX(InterruptRedirectionTemplate):
  47   int     0x8
  48   DB      0xcf          ; IRET
  49   nop
  50   int     0x9
  51   DB      0xcf          ; IRET
  52   nop
  53   int     0xa
  54   DB      0xcf          ; IRET
  55   nop
  56   int     0xb
  57   DB      0xcf          ; IRET
  58   nop
  59   int     0xc
  60   DB      0xcf          ; IRET
  61   nop
  62   int     0xd
  63   DB      0xcf          ; IRET
  64   nop
  65   int     0xe
  66   DB      0xcf          ; IRET
  67   nop
  68   int     0xf
  69   DB      0xcf          ; IRET
  70   nop
  71