OvmfPkg/Sec/X64/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 DEFAULT REL
  21 SECTION .text
  22
  23 extern ASM_PFX(SecCoreStartupWithStack)
  24
  25 ;
  26 ; SecCore Entry Point
  27 ;
  28 ; Processor is in flat protected mode
  29 ;
  30 ; @param[in]  RAX   Initial value of the EAX register (BIST: Built-in Self Test)
  31 ; @param[in]  DI    'BP': boot-strap processor, or 'AP': application processor
  32 ; @param[in]  RBP   Pointer to the start of the Boot Firmware Volume
  33 ; @param[in]  DS    Selector allowing flat access to all addresses
  34 ; @param[in]  ES    Selector allowing flat access to all addresses
  35 ; @param[in]  FS    Selector allowing flat access to all addresses
  36 ; @param[in]  GS    Selector allowing flat access to all addresses
  37 ; @param[in]  SS    Selector allowing flat access to all addresses
  38 ;
  39 ; @return     None  This routine does not return
  40 ;
  41 global ASM_PFX(_ModuleEntryPoint)
  42 ASM_PFX(_ModuleEntryPoint):
  43
  44     ;
  45     ; Fill the temporary RAM with the initial stack value.
  46     ; The loop below will seed the heap as well, but that's harmless.
  47     ;
  48     mov     rax, (FixedPcdGet32 (PcdInitValueInTempStack) << 32) | FixedPcdGet32 (PcdInitValueInTempStack)
  49                                                               ; qword to store
  50     mov     rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase)     ; base address,
  51                                                               ;   relative to
  52                                                               ;   ES
  53     mov     rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 8 ; qword count
  54     cld                                                       ; store from base
  55                                                               ;   up
  56     rep stosq
  57
  58     ;
  59     ; Load temporary RAM stack based on PCDs
  60     ;
  61     %define SEC_TOP_OF_STACK (FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) + \
  62                           FixedPcdGet32 (PcdOvmfSecPeiTempRamSize))
  63     mov     rsp, SEC_TOP_OF_STACK
  64     nop
  65
  66     ;
  67     ; Setup parameters and call SecCoreStartupWithStack
  68     ;   rcx: BootFirmwareVolumePtr
  69     ;   rdx: TopOfCurrentStack
  70     ;
  71     mov     rcx, rbp
  72     mov     rdx, rsp
  73     sub     rsp, 0x20
  74     call    ASM_PFX(SecCoreStartupWithStack)
  75