UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;  ResetVec.nasmb
   9 ;
  10 ; Abstract:
  11 ;
  12 ;  Reset Vector Data structure
  13 ;  This structure is located at 0xFFFFFFC0
  14 ;
  15 ;------------------------------------------------------------------------------
  16
  17 ;    .stack  0x0
  18 ;    SECTION .text
  19 USE16
  20
  21 ;
  22 ; The layout of this file is fixed. The build tool makes assumption of the layout.
  23 ;
  24
  25     ORG     0h
  26 ;
  27 ; Reserved
  28 ;
  29 ReservedData:            DD 0eeeeeeeeh, 0eeeeeeeeh
  30
  31     TIMES 0x10-($-$$) DB 0
  32 ;
  33 ; This is located at 0xFFFFFFD0h
  34 ;
  35     mov     di, "PA"
  36     jmp     ApStartup
  37
  38     TIMES 0x20-($-$$) DB 0
  39 ;
  40 ; Pointer to the entry point of the PEI core
  41 ; It is located at 0xFFFFFFE0, and is fixed up by some build tool
  42 ; So if the value 8..1 appears in the final FD image, tool failure occurs.
  43 ;
  44 PeiCoreEntryPoint:       DD      87654321h
  45
  46 ;
  47 ; This is the handler for all kinds of exceptions. Since it's for debugging
  48 ; purpose only, nothing except a dead loop would be done here. Developers could
  49 ; analyze the cause of the exception if a debugger had been attached.
  50 ;
  51 global ASM_PFX(InterruptHandler)
  52 ASM_PFX(InterruptHandler):
  53     jmp     $
  54     iret
  55
  56     TIMES 0x30-($-$$) DB 0
  57 ;
  58 ; For IA32, the reset vector must be at 0xFFFFFFF0, i.e., 4G-16 byte
  59 ; Execution starts here upon power-on/platform-reset.
  60 ;
  61 ResetHandler:
  62     nop
  63     nop
  64 ApStartup:
  65     ;
  66     ; Jmp Rel16 instruction
  67     ; Use machine code directly in case of the assembler optimization
  68     ; SEC entry point relative address will be fixed up by some build tool.
  69     ;
  70     ; Typically, SEC entry point is the function _ModuleEntryPoint() defined in
  71     ; SecEntry.asm
  72     ;
  73     DB      0e9h
  74     DW      -3
  75
  76
  77     TIMES 0x38-($-$$) DB 0
  78 ;
  79 ; Ap reset vector segment address is at 0xFFFFFFF8
  80 ; This will be fixed up by some build tool,
  81 ; so if the value 1..8 appears in the final FD image,
  82 ; tool failure occurs
  83 ;
  84 ApSegAddress:    dd      12345678h
  85
  86     TIMES 0x3c-($-$$) DB 0
  87 ;
  88 ; BFV Base is at 0xFFFFFFFC
  89 ; This will be fixed up by some build tool,
  90 ; so if the value 1..8 appears in the final FD image,
  91 ; tool failure occurs.
  92 ;
  93 BfvBase:     DD      12345678h
  94
  95 ;
  96 ; Nothing can go here, otherwise the layout of this file would change.
  97 ;