OvmfPkg/Sec/X64/SecEntry.nasm

   1 ;------------------------------------------------------------------------------
   2 ;*
   3 ;*   Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
   4 ;*   SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;*
   6 ;*    CpuAsm.asm
   7 ;*
   8 ;*   Abstract:
   9 ;*
  10 ;------------------------------------------------------------------------------
  11
  12 #include <Base.h>
  13
  14 DEFAULT REL
  15 SECTION .text
  16
  17 extern ASM_PFX(SecCoreStartupWithStack)
  18
  19 ;
  20 ; SecCore Entry Point
  21 ;
  22 ; Processor is in flat protected mode
  23 ;
  24 ; @param[in]  RAX   Initial value of the EAX register (BIST: Built-in Self Test)
  25 ; @param[in]  DI    'BP': boot-strap processor, or 'AP': application processor
  26 ; @param[in]  RBP   Pointer to the start of the Boot Firmware Volume
  27 ; @param[in]  DS    Selector allowing flat access to all addresses
  28 ; @param[in]  ES    Selector allowing flat access to all addresses
  29 ; @param[in]  FS    Selector allowing flat access to all addresses
  30 ; @param[in]  GS    Selector allowing flat access to all addresses
  31 ; @param[in]  SS    Selector allowing flat access to all addresses
  32 ;
  33 ; @return     None  This routine does not return
  34 ;
  35 global ASM_PFX(_ModuleEntryPoint)
  36 ASM_PFX(_ModuleEntryPoint):
  37
  38     ;
  39     ; Fill the temporary RAM with the initial stack value.
  40     ; The loop below will seed the heap as well, but that's harmless.
  41     ;
  42     mov     rax, (FixedPcdGet32 (PcdInitValueInTempStack) << 32) | FixedPcdGet32 (PcdInitValueInTempStack)
  43                                                               ; qword to store
  44     mov     rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase)     ; base address,
  45                                                               ;   relative to
  46                                                               ;   ES
  47     mov     rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 8 ; qword count
  48     cld                                                       ; store from base
  49                                                               ;   up
  50     rep stosq
  51
  52     ;
  53     ; Load temporary RAM stack based on PCDs
  54     ;
  55     %define SEC_TOP_OF_STACK (FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) + \
  56                           FixedPcdGet32 (PcdOvmfSecPeiTempRamSize))
  57     mov     rsp, SEC_TOP_OF_STACK
  58     nop
  59
  60     ;
  61     ; Setup parameters and call SecCoreStartupWithStack
  62     ;   rcx: BootFirmwareVolumePtr
  63     ;   rdx: TopOfCurrentStack
  64     ;
  65     mov     rcx, rbp
  66     mov     rdx, rsp
  67     sub     rsp, 0x20
  68     call    ASM_PFX(SecCoreStartupWithStack)
  69