UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
   4 # This program and the accompanying materials
   5 # are licensed and made available under the terms and conditions of the BSD License
   6 # which accompanies this distribution.  The full text of the license may be found at
   7 # http://opensource.org/licenses/bsd-license.php.
   8 #
   9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 #
  12 # Module Name:
  13 #
  14 #   SmmInit.S
  15 #
  16 # Abstract:
  17 #
  18 #   Functions for relocating SMBASE's for all processors
  19 #
  20 #------------------------------------------------------------------------------
  21
  22 ASM_GLOBAL   ASM_PFX(gSmmCr0)
  23 ASM_GLOBAL   ASM_PFX(gSmmCr3)
  24 ASM_GLOBAL   ASM_PFX(gSmmCr4)
  25 ASM_GLOBAL   ASM_PFX(gcSmmInitTemplate)
  26 ASM_GLOBAL   ASM_PFX(gcSmmInitSize)
  27 ASM_GLOBAL   ASM_PFX(gSmmJmpAddr)
  28 ASM_GLOBAL   ASM_PFX(SmmRelocationSemaphoreComplete)
  29 ASM_GLOBAL   ASM_PFX(gSmmInitStack)
  30 ASM_GLOBAL   ASM_PFX(gcSmiInitGdtr)
  31
  32 .equ            PROTECT_MODE_CS, 0x08
  33 .equ            PROTECT_MODE_DS, 0x20
  34
  35     .text
  36
  37 ASM_PFX(gcSmiInitGdtr):
  38             .word      0
  39             .quad      0
  40
  41 SmmStartup:
  42     .byte   0x66,0xb8
  43 ASM_PFX(gSmmCr3):    .space     4
  44     movl    %eax, %cr3
  45     .byte   0x67,0x66
  46     lgdt    %cs:(ASM_PFX(gcSmiInitGdtr) - SmmStartup)(%ebp)
  47     .byte   0x66,0xb8
  48 ASM_PFX(gSmmCr4):    .space     4
  49     movl    %eax, %cr4
  50     .byte   0x66,0xb8
  51 ASM_PFX(gSmmCr0):    .space     4
  52     .byte   0xbf, PROTECT_MODE_DS, 0      # mov di, PROTECT_MODE_DS
  53     movl    %eax, %cr0
  54     .byte   0x66,0xea                     # jmp far [ptr48]
  55 ASM_PFX(gSmmJmpAddr): .long Start32bit
  56     .word   PROTECT_MODE_CS
  57 Start32bit:
  58     movl    %edi,%ds
  59     movl    %edi,%es
  60     movl    %edi,%fs
  61     movl    %edi,%gs
  62     movl    %edi,%ss
  63     .byte   0xbc                        # mov esp, imm32
  64 ASM_PFX(gSmmInitStack):  .space  4
  65     call    ASM_PFX(SmmInitHandler)
  66     rsm
  67
  68 ASM_PFX(gcSmmInitTemplate):
  69
  70 _SmmInitTemplate:
  71     .byte 0x66
  72     movl    $SmmStartup, %ebp
  73     .byte 0x66, 0x81, 0xed, 0, 0, 3, 0  # sub ebp, 0x30000
  74     jmp     *%bp                        # jmp ebp actually
  75
  76 ASM_PFX(gcSmmInitSize):   .word  . - ASM_PFX(gcSmmInitTemplate)
  77
  78
  79 ASM_PFX(SmmRelocationSemaphoreComplete):
  80     pushl   %eax
  81     movl    ASM_PFX(mRebasedFlag), %eax
  82     movb    $1, (%eax)
  83     popl    %eax
  84     jmp     *ASM_PFX(mSmmRelocationOriginalAddress)