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 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   7 ;
   8 ;;
   9
  10     DEFAULT REL
  11     SECTION .text
  12
  13 ;----------------------------------------------------------------------------
  14 ; Procedure:    InterruptRedirectionTemplate: Redirects interrupts 0x68-0x6F
  15 ;
  16 ; Input:        None
  17 ;
  18 ; Output:       None
  19 ;
  20 ; Prototype:    VOID
  21 ;               InterruptRedirectionTemplate (
  22 ;                                VOID
  23 ;                                );
  24 ;
  25 ; Saves:        None
  26 ;
  27 ; Modified:     None
  28 ;
  29 ; Description:  Contains the code that is copied into low memory (below 640K).
  30 ;               This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f.
  31 ;               This template must be copied into low memory, and the IDT entries
  32 ;               0x68-0x6F must be point to the low memory copy of this code.  Each
  33 ;               entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily
  34 ;               computed.
  35 ;
  36 ;----------------------------------------------------------------------------
  37
  38 global ASM_PFX(InterruptRedirectionTemplate)
  39 ASM_PFX(InterruptRedirectionTemplate):
  40   int     0x8
  41   DB      0xcf          ; IRET
  42   nop
  43   int     0x9
  44   DB      0xcf          ; IRET
  45   nop
  46   int     0xa
  47   DB      0xcf          ; IRET
  48   nop
  49   int     0xb
  50   DB      0xcf          ; IRET
  51   nop
  52   int     0xc
  53   DB      0xcf          ; IRET
  54   nop
  55   int     0xd
  56   DB      0xcf          ; IRET
  57   nop
  58   int     0xe
  59   DB      0xcf          ; IRET
  60   nop
  61   int     0xf
  62   DB      0xcf          ; IRET
  63   nop
  64