IntelFrameworkModulePkg/Csm/LegacyBiosDxe/X64/InterruptTable.S

   1 ## @file
   2 #  Interrupt Redirection Template
   3 #
   4 # Copyright (c) 2006, 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 #text SEGMENT
  18
  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 ASM_GLOBAL ASM_PFX(InterruptRedirectionTemplate)
  46 ASM_PFX(InterruptRedirectionTemplate):
  47   int     $0x08
  48   .byte      0x0cf          # IRET
  49   nop
  50   int     $0x09
  51   .byte      0x0cf          # IRET
  52   nop
  53   int     $0x0a
  54   .byte      0x0cf          # IRET
  55   nop
  56   int     $0x0b
  57   .byte      0x0cf          # IRET
  58   nop
  59   int     $0x0c
  60   .byte      0x0cf          # IRET
  61   nop
  62   int     $0x0d
  63   .byte      0x0cf          # IRET
  64   nop
  65   int     $0x0e
  66   .byte      0x0cf          # IRET
  67   nop
  68   int     $0x0f
  69   .byte      0x0cf          # IRET
  70   nop
  71
  72 #END