MdeModulePkg/Core/DxeIplPeim/Ia32/IdtVectorAsm.S

   1 /*
   2 ;-------------------------------------------------------------------------------
   3 ;
   4 ; Copyright (c) 2007, 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 ; Module Name:
  15 ;
  16 ;   IdtVectorAsm.S
  17 ;
  18 ; Abstract:
  19 ;
  20 ;
  21 ;--------------------------------------------------------------------   --------
  22 */
  23
  24     .text
  25     .code32
  26
  27
  28     .align  8
  29     .globl  ASM_PFX(AsmGetVectorTemplatInfo)
  30     .globl      ASM_PFX(AsmVectorFixup)
  31 /*
  32 ;
  33 ;-----------------------------------------------------------------------
  34 ;  Template of IDT Vector Handlers.
  35 ;
  36 ;-----------------------------------------------------------------------
  37 */
  38 @VectorTemplateBase:
  39         pushl %eax
  40         .byte 0x6a    #  push #VectorNum
  41 @VectorNum:
  42         .byte 0
  43         movl  CommonInterruptEntry, %eax
  44         jmp   *%eax
  45 @VectorTemplateEnd:
  46
  47
  48 ASM_PFX(AsmGetVectorTemplatInfo):
  49         movl  4(%esp), %ecx
  50         movl  $@VectorTemplateBase, (%ecx)
  51         movl  $(@VectorTemplateEnd - @VectorTemplateBase), %eax
  52         ret
  53
  54 ASM_PFX(AsmVectorFixup):
  55         movl  8(%esp), %eax
  56         movl  4(%esp), %ecx
  57         movb  %al, (@VectorNum - @VectorTemplateBase)(%ecx)
  58         ret
  59
  60 /*
  61 ; The follow algorithm is used for the common interrupt routine.
  62
  63 ;
  64 ; +---------------------+ <-- 16-byte aligned ensured by processor
  65 ; +    Old SS           +
  66 ; +---------------------+
  67 ; +    Old RSP          +
  68 ; +---------------------+
  69 ; +    RFlags           +
  70 ; +---------------------+
  71 ; +    CS               +
  72 ; +---------------------+
  73 ; +    RIP              +
  74 ; +---------------------+
  75 ; +    Error Code       +
  76 ; +---------------------+
  77 ; +    Vector Number    +
  78 ; +---------------------+
  79 */
  80
  81 CommonInterruptEntry:
  82         cli
  83 @@:
  84         jmp   @@
  85
  86
  87
  88