IntelFrameworkModulePkg/Csm/LegacyBiosDxe/IA32/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 ASM_GLOBAL ASM_PFX(InterruptRedirectionTemplate)
  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 ASM_PFX(InterruptRedirectionTemplate):
  44   int     $0x8
  45   .byte   0xcf
  46   nop
  47   int     $0x9
  48   .byte   0xcf
  49   nop
  50   int     $0xa
  51   .byte   0xcf
  52   nop
  53   int     $0xb
  54   .byte   0xcf
  55   nop
  56   int     $0xc
  57   .byte   0xcf
  58   nop
  59   int     $0xd
  60   .byte   0xcf
  61   nop
  62   int     $0xe
  63   .byte   0xcf
  64   nop
  65   int     $0xf
  66   .byte   0xcf
  67   nop