OvmfPkg/Sec/Ia32/SecEntry.nasm

   1 ;------------------------------------------------------------------------------
   2 ;*
   3 ;*   Copyright (c) 2006 - 2013, 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 ;*    CpuAsm.asm
  13 ;*
  14 ;*   Abstract:
  15 ;*
  16 ;------------------------------------------------------------------------------
  17
  18 #include <Base.h>
  19
  20     SECTION .text
  21
  22 extern ASM_PFX(SecCoreStartupWithStack)
  23
  24 ;
  25 ; SecCore Entry Point
  26 ;
  27 ; Processor is in flat protected mode
  28 ;
  29 ; @param[in]  EAX   Initial value of the EAX register (BIST: Built-in Self Test)
  30 ; @param[in]  DI    'BP': boot-strap processor, or 'AP': application processor
  31 ; @param[in]  EBP   Pointer to the start of the Boot Firmware Volume
  32 ; @param[in]  DS    Selector allowing flat access to all addresses
  33 ; @param[in]  ES    Selector allowing flat access to all addresses
  34 ; @param[in]  FS    Selector allowing flat access to all addresses
  35 ; @param[in]  GS    Selector allowing flat access to all addresses
  36 ; @param[in]  SS    Selector allowing flat access to all addresses
  37 ;
  38 ; @return     None  This routine does not return
  39 ;
  40 global ASM_PFX(_ModuleEntryPoint)
  41 ASM_PFX(_ModuleEntryPoint):
  42
  43     ;
  44     ; Fill the temporary RAM with the initial stack value.
  45     ; The loop below will seed the heap as well, but that's harmless.
  46     ;
  47     mov     eax, FixedPcdGet32 (PcdInitValueInTempStack)      ; dword to store
  48     mov     edi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase)     ; base address,
  49                                                               ;   relative to
  50                                                               ;   ES
  51     mov     ecx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 4 ; dword count
  52     cld                                                       ; store from base
  53                                                               ;   up
  54     rep stosd
  55
  56     ;
  57     ; Load temporary RAM stack based on PCDs
  58     ;
  59     %define SEC_TOP_OF_STACK (FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) + \
  60                           FixedPcdGet32 (PcdOvmfSecPeiTempRamSize))
  61     mov     eax, SEC_TOP_OF_STACK
  62     mov     esp, eax
  63     nop
  64
  65     ;
  66     ; Setup parameters and call SecCoreStartupWithStack
  67     ;   [esp]   return address for call
  68     ;   [esp+4] BootFirmwareVolumePtr
  69     ;   [esp+8] TopOfCurrentStack
  70     ;
  71     push    eax
  72     push    ebp
  73     call    ASM_PFX(SecCoreStartupWithStack)
  74