MdeModulePkg/Core/DxeIplPeim/Ia32/IdtVectorAsm.S

   1 #/**@file
   2 # IDT vector entry.
   3 #
   4 # Copyright (c) 2007 - 2008, Intel Corporation
   5 # All rights reserved. This program and the accompanying materials
   6 # are licensed and made available under the terms and conditions of the BSD License
   7 # which accompanies this distribution.  The full text of the license may be found at
   8 # http://opensource.org/licenses/bsd-license.php
   9 #
  10 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 #
  13 #**/
  14
  15     .text
  16     .code32
  17
  18
  19     .align  8
  20     .globl  ASM_PFX(AsmGetVectorTemplatInfo)
  21     .globl      ASM_PFX(AsmVectorFixup)
  22 /*
  23 ;
  24 ;-----------------------------------------------------------------------
  25 ;  Template of IDT Vector Handlers.
  26 ;
  27 ;-----------------------------------------------------------------------
  28 */
  29 @VectorTemplateBase:
  30         pushl %eax
  31         .byte 0x6a    #  push #VectorNum
  32 @VectorNum:
  33         .byte 0
  34         movl  CommonInterruptEntry, %eax
  35         jmp   *%eax
  36 @VectorTemplateEnd:
  37
  38
  39 ASM_PFX(AsmGetVectorTemplatInfo):
  40         movl  4(%esp), %ecx
  41         movl  $@VectorTemplateBase, (%ecx)
  42         movl  $(@VectorTemplateEnd - @VectorTemplateBase), %eax
  43         ret
  44
  45 ASM_PFX(AsmVectorFixup):
  46         movl  8(%esp), %eax
  47         movl  4(%esp), %ecx
  48         movb  %al, (@VectorNum - @VectorTemplateBase)(%ecx)
  49         ret
  50
  51 /*
  52 ; The follow algorithm is used for the common interrupt routine.
  53
  54 ;
  55 ; +---------------------+ <-- 16-byte aligned ensured by processor
  56 ; +    Old SS           +
  57 ; +---------------------+
  58 ; +    Old RSP          +
  59 ; +---------------------+
  60 ; +    RFlags           +
  61 ; +---------------------+
  62 ; +    CS               +
  63 ; +---------------------+
  64 ; +    RIP              +
  65 ; +---------------------+
  66 ; +    Error Code       +
  67 ; +---------------------+
  68 ; +    Vector Number    +
  69 ; +---------------------+
  70 */
  71
  72 CommonInterruptEntry:
  73         cli
  74 @@:
  75         jmp   @@
  76
  77
  78
  79