MdeModulePkg/Core/DxeIplPeim/Ia32/IdtVectorAsm.S

   1 #/** @file
   2 #
   3 #    IDT vector entry.
   4 #
   5 #  Copyright (c) 2007 - 2009, Intel Corporation. <BR>
   6 #  All rights reserved. This program and the accompanying materials
   7 #  are licensed and made available under the terms and conditions of the BSD License
   8 #  which accompanies this distribution.  The full text of the license may be found at
   9 #  http://opensource.org/licenses/bsd-license.php
  10 #
  11 #  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 #  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 #
  14 #**/
  15
  16     .text
  17     .code32
  18
  19
  20     .p2align 3
  21     ASM_GLOBAL  ASM_PFX(AsmGetVectorTemplatInfo)
  22     ASM_GLOBAL  ASM_PFX(AsmVectorFixup)
  23 /*
  24 ;
  25 ;-----------------------------------------------------------------------
  26 ;  Template of IDT Vector Handlers.
  27 ;
  28 ;-----------------------------------------------------------------------
  29 */
  30 VectorTemplateBase:
  31         pushl %eax
  32         .byte 0x6a    #  push #VectorNum
  33 VectorNum:
  34         .byte 0
  35         movl  CommonInterruptEntry, %eax
  36         jmp   *%eax
  37 VectorTemplateEnd:
  38
  39
  40 ASM_PFX(AsmGetVectorTemplatInfo):
  41         movl  4(%esp), %ecx
  42         movl  $VectorTemplateBase, (%ecx)
  43         movl  $(VectorTemplateEnd - VectorTemplateBase), %eax
  44         ret
  45
  46 ASM_PFX(AsmVectorFixup):
  47         movl  8(%esp), %eax
  48         movl  4(%esp), %ecx
  49         movb  %al, (VectorNum - VectorTemplateBase)(%ecx)
  50         ret
  51
  52 /*
  53 ; The follow algorithm is used for the common interrupt routine.
  54
  55 ;
  56 ; +---------------------+ <-- 16-byte aligned ensured by processor
  57 ; +    Old SS           +
  58 ; +---------------------+
  59 ; +    Old RSP          +
  60 ; +---------------------+
  61 ; +    RFlags           +
  62 ; +---------------------+
  63 ; +    CS               +
  64 ; +---------------------+
  65 ; +    RIP              +
  66 ; +---------------------+
  67 ; +    Error Code       +
  68 ; +---------------------+
  69 ; +    Vector Number    +
  70 ; +---------------------+
  71 */
  72
  73 CommonInterruptEntry:
  74         cli
  75 1:
  76         jmp   1b
  77
  78
  79
  80