IntelFspPkg/FspSecCore/Ia32/ResetVec.asm16

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Abstract:
   7 ;
   8 ;  Reset Vector Data structure
   9 ;  This structure is located at 0xFFFFFFC0
  10 ;
  11 ;------------------------------------------------------------------------------
  12
  13     .model  tiny
  14     .686p
  15     .stack  0h
  16     .code
  17
  18 ;
  19 ; The layout of this file is fixed. The build tool makes assumption of the layout.
  20 ;
  21
  22     ORG     0h
  23 ;
  24 ; Reserved
  25 ;
  26 ReservedData         DD 0eeeeeeeeh, 0eeeeeeeeh
  27
  28     ORG     10h
  29 ;
  30 ; This is located at 0xFFFFFFD0h
  31 ;
  32     mov     di, "AP"
  33     jmp     ApStartup
  34
  35     ORG     20h
  36 ;
  37 ; Pointer to the entry point of the PEI core
  38 ; It is located at 0xFFFFFFE0, and is fixed up by some build tool
  39 ; So if the value 8..1 appears in the final FD image, tool failure occurs.
  40 ;
  41 PeiCoreEntryPoint       DD      12345678h
  42
  43 ;
  44 ; This is the handler for all kinds of exceptions. Since it's for debugging
  45 ; purpose only, nothing except a deadloop would be done here. Developers could
  46 ; analyze the cause of the exception if a debugger had been attached.
  47 ;
  48 InterruptHandler    PROC
  49     jmp     $
  50     iret
  51 InterruptHandler    ENDP
  52
  53     ORG     30h
  54 ;
  55 ; For IA32, the reset vector must be at 0xFFFFFFF0, i.e., 4G-16 byte
  56 ; Execution starts here upon power-on/platform-reset.
  57 ;
  58 ResetHandler:
  59     nop
  60     nop
  61
  62 ApStartup:
  63     ;
  64     ; Jmp Rel16 instruction
  65     ; Use machine code directly in case of the assembler optimization
  66     ; SEC entry point relatvie address will be fixed up by some build tool.
  67     ;
  68     ; Typically, SEC entry point is the function _ModuleEntryPoint() defined in
  69     ; SecEntry.asm
  70     ;
  71     DB      0e9h
  72     DW      -3
  73
  74
  75     ORG     38h
  76 ;
  77 ; Ap reset vector segment address is at 0xFFFFFFF8
  78 ; This will be fixed up by some build tool,
  79 ; so if the value 1..8 appears in the final FD image,
  80 ; tool failure occurs
  81 ;
  82 ApSegAddress    dd      12345678h
  83
  84     ORG     3ch
  85 ;
  86 ; BFV Base is at 0xFFFFFFFC
  87 ; This will be fixed up by some build tool,
  88 ; so if the value 1..8 appears in the final FD image,
  89 ; tool failure occurs.
  90 ;
  91 BfvBase     DD      12345678h
  92
  93 ;
  94 ; Nothing can go here, otherwise the layout of this file would change.
  95 ;
  96
  97     END