OvmfPkg/Sec/Ia32: seed the temporary RAM with PcdInitValueInTempStack

[mirror_edk2.git] / OvmfPkg / Sec / Ia32 / SecEntry.nasm

;------------------------------------------------------------------------------\r
;*\r
;*   Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>\r
;*   This program and the accompanying materials\r
;*   are licensed and made available under the terms and conditions of the BSD License\r
;*   which accompanies this distribution.  The full text of the license may be found at\r
;*   http://opensource.org/licenses/bsd-license.php\r
;*\r
;*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
;*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;*\r
;*    CpuAsm.asm\r
;*\r
;*   Abstract:\r
;*\r
;------------------------------------------------------------------------------\r
\r
#include <Base.h>\r
\r
    SECTION .text\r
\r
extern ASM_PFX(SecCoreStartupWithStack)\r
\r
;\r
; SecCore Entry Point\r
;\r
; Processor is in flat protected mode\r
;\r
; @param[in]  EAX   Initial value of the EAX register (BIST: Built-in Self Test)\r
; @param[in]  DI    'BP': boot-strap processor, or 'AP': application processor\r
; @param[in]  EBP   Pointer to the start of the Boot Firmware Volume\r
; @param[in]  DS    Selector allowing flat access to all addresses\r
; @param[in]  ES    Selector allowing flat access to all addresses\r
; @param[in]  FS    Selector allowing flat access to all addresses\r
; @param[in]  GS    Selector allowing flat access to all addresses\r
; @param[in]  SS    Selector allowing flat access to all addresses\r
;\r
; @return     None  This routine does not return\r
;\r
global ASM_PFX(_ModuleEntryPoint)\r
ASM_PFX(_ModuleEntryPoint):\r
\r
    ;\r
    ; Fill the temporary RAM with the initial stack value.\r
    ; The loop below will seed the heap as well, but that's harmless.\r
    ;\r
    mov     eax, FixedPcdGet32 (PcdInitValueInTempStack)      ; dword to store\r
    mov     edi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase)     ; base address,\r
                                                              ;   relative to\r
                                                              ;   ES\r
    mov     ecx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 4 ; dword count\r
    cld                                                       ; store from base\r
                                                              ;   up\r
    rep stosd\r
\r
    ;\r
    ; Load temporary RAM stack based on PCDs\r
    ;\r
    %define SEC_TOP_OF_STACK (FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) + \\r
                          FixedPcdGet32 (PcdOvmfSecPeiTempRamSize))\r
    mov     eax, SEC_TOP_OF_STACK\r
    mov     esp, eax\r
    nop\r
\r
    ;\r
    ; Setup parameters and call SecCoreStartupWithStack\r
    ;   [esp]   return address for call\r
    ;   [esp+4] BootFirmwareVolumePtr\r
    ;   [esp+8] TopOfCurrentStack\r
    ;\r
    push    eax\r
    push    ebp\r
    call    ASM_PFX(SecCoreStartupWithStack)\r
\r