MdeModulePkg/Core/DxeIplPeim/Ia32/IdtVectorAsm.asm

   1 ;/** @file
   2 ;    IDT vector entry.
   3 ;
   4 ;  Copyright (c) 2007 - 2008, Intel Corporation. <BR>
   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     .686p
  16     .model  flat,C
  17     .code
  18
  19 ;
  20 ;------------------------------------------------------------------------------
  21 ;  Generic IDT Vector Handlers for the Host.
  22 ;
  23 ;------------------------------------------------------------------------------
  24
  25 ALIGN   8
  26 PUBLIC  AsmGetVectorTemplatInfo
  27 PUBLIC  AsmVectorFixup
  28
  29 PUBLIC  AsmVectorFixup
  30
  31 @VectorTemplateBase:
  32         push  eax
  33         db    6ah       ; push #VectorNumber
  34 @VectorNum:
  35         db    0
  36         mov   eax, CommonInterruptEntry
  37         jmp   eax
  38 @VectorTemplateEnd:
  39
  40
  41 AsmGetVectorTemplatInfo PROC
  42         mov   ecx, [esp + 4]
  43         mov   [ecx], @VectorTemplateBase
  44         mov   eax, (@VectorTemplateEnd - @VectorTemplateBase)
  45         ret
  46 AsmGetVectorTemplatInfo ENDP
  47
  48
  49 AsmVectorFixup PROC
  50         mov   eax, dword ptr [esp + 8]
  51         mov   ecx, [esp + 4]
  52         mov   [ecx + (@VectorNum - @VectorTemplateBase)], al
  53         ret
  54 AsmVectorFixup ENDP
  55
  56
  57 ;---------------------------------------;
  58 ; CommonInterruptEntry                  ;
  59 ;---------------------------------------;
  60 ; The follow algorithm is used for the common interrupt routine.
  61
  62 ;
  63 ; +---------------------+ <-- 16-byte aligned ensured by processor
  64 ; +    Old SS           +
  65 ; +---------------------+
  66 ; +    Old RSP          +
  67 ; +---------------------+
  68 ; +    RFlags           +
  69 ; +---------------------+
  70 ; +    CS               +
  71 ; +---------------------+
  72 ; +    RIP              +
  73 ; +---------------------+
  74 ; +    Error Code       +
  75 ; +---------------------+
  76 ; +    Vector Number    +
  77 ; +---------------------+
  78
  79 CommonInterruptEntry PROC
  80   cli
  81
  82   jmp $
  83 CommonInterruptEntry ENDP
  84
  85 END
  86
  87