UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm

   1 ;------------------------------------------------------------------------------ ;
   2 ; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
   3 ; This program and the accompanying materials
   4 ; are licensed and made available under the terms and conditions of the BSD License
   5 ; which accompanies this distribution.  The full text of the license may be found at
   6 ; http://opensource.org/licenses/bsd-license.php.
   7 ;
   8 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10 ;
  11 ; Module Name:
  12 ;
  13 ;   SmmInit.Asm
  14 ;
  15 ; Abstract:
  16 ;
  17 ;   Functions for relocating SMBASE's for all processors
  18 ;
  19 ;-------------------------------------------------------------------------------
  20
  21     .686p
  22     .xmm
  23     .model  flat,C
  24
  25 SmmInitHandler  PROTO   C
  26
  27 EXTERNDEF   C   gSmmCr0:DWORD
  28 EXTERNDEF   C   gSmmCr3:DWORD
  29 EXTERNDEF   C   gSmmCr4:DWORD
  30 EXTERNDEF   C   gcSmmInitTemplate:BYTE
  31 EXTERNDEF   C   gcSmmInitSize:WORD
  32 EXTERNDEF   C   gSmmJmpAddr:QWORD
  33 EXTERNDEF   C   mRebasedFlag:PTR BYTE
  34 EXTERNDEF   C   mSmmRelocationOriginalAddress:DWORD
  35 EXTERNDEF   C   gSmmInitStack:DWORD
  36 EXTERNDEF   C   gcSmiInitGdtr:FWORD
  37
  38 PROTECT_MODE_CS EQU   08h
  39 PROTECT_MODE_DS EQU   20h
  40
  41     .code
  42
  43 gcSmiInitGdtr   LABEL   FWORD
  44             DW      0
  45             DQ      0
  46
  47 SmmStartup  PROC
  48     DB      66h, 0b8h
  49 gSmmCr3     DD      ?
  50     mov     cr3, eax
  51     DB      67h, 66h
  52     lgdt    fword ptr cs:[ebp + (offset gcSmiInitGdtr - SmmStartup)]
  53     DB      66h, 0b8h
  54 gSmmCr4     DD      ?
  55     mov     cr4, eax
  56     DB      66h, 0b8h
  57 gSmmCr0     DD      ?
  58     DB      0bfh, PROTECT_MODE_DS, 0    ; mov di, PROTECT_MODE_DS
  59     mov     cr0, eax
  60     DB      66h, 0eah                   ; jmp far [ptr48]
  61 gSmmJmpAddr LABEL   QWORD
  62     DD      @32bit
  63     DW      PROTECT_MODE_CS
  64 @32bit:
  65     mov     ds, edi
  66     mov     es, edi
  67     mov     fs, edi
  68     mov     gs, edi
  69     mov     ss, edi
  70     DB      0bch                        ; mov esp, imm32
  71 gSmmInitStack  DD ?
  72     call    SmmInitHandler
  73     rsm
  74 SmmStartup  ENDP
  75
  76 gcSmmInitTemplate   LABEL   BYTE
  77
  78 _SmmInitTemplate    PROC
  79     DB      66h
  80     mov     ebp, SmmStartup
  81     DB      66h, 81h, 0edh, 00h, 00h, 03h, 00  ; sub ebp, 30000h
  82     jmp     bp                          ; jmp ebp actually
  83 _SmmInitTemplate    ENDP
  84
  85 gcSmmInitSize   DW  $ - gcSmmInitTemplate
  86
  87 SmmRelocationSemaphoreComplete PROC
  88     push    eax
  89     mov     eax, mRebasedFlag
  90     mov     byte ptr [eax], 1
  91     pop     eax
  92     jmp     [mSmmRelocationOriginalAddress]
  93 SmmRelocationSemaphoreComplete ENDP
  94     END