audk/OvmfPkg/Sec/X64/SecEntry.nasm

;------------------------------------------------------------------------------
;*
;*   Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
;*   This program and the accompanying materials
;*   are licensed and made available under the terms and conditions of the BSD License
;*   which accompanies this distribution.  The full text of the license may be found at
;*   http://opensource.org/licenses/bsd-license.php
;*
;*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
;*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;*
;*    CpuAsm.asm
;*
;*   Abstract:
;*
;------------------------------------------------------------------------------

#include <Base.h>

DEFAULT REL
SECTION .text

extern ASM_PFX(SecCoreStartupWithStack)

;
; SecCore Entry Point
;
; Processor is in flat protected mode
;
; @param[in]  RAX   Initial value of the EAX register (BIST: Built-in Self Test)
; @param[in]  DI    'BP': boot-strap processor, or 'AP': application processor
; @param[in]  RBP   Pointer to the start of the Boot Firmware Volume
; @param[in]  DS    Selector allowing flat access to all addresses
; @param[in]  ES    Selector allowing flat access to all addresses
; @param[in]  FS    Selector allowing flat access to all addresses
; @param[in]  GS    Selector allowing flat access to all addresses
; @param[in]  SS    Selector allowing flat access to all addresses
;
; @return     None  This routine does not return
;
global ASM_PFX(_ModuleEntryPoint)
ASM_PFX(_ModuleEntryPoint):

    ;
    ; Fill the temporary RAM with the initial stack value.
    ; The loop below will seed the heap as well, but that's harmless.
    ;
    mov     rax, (FixedPcdGet32 (PcdInitValueInTempStack) << 32) | FixedPcdGet32 (PcdInitValueInTempStack)
                                                              ; qword to store
    mov     rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase)     ; base address,
                                                              ;   relative to
                                                              ;   ES
    mov     rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 8 ; qword count
    cld                                                       ; store from base
                                                              ;   up
    rep stosq

    ;
    ; Load temporary RAM stack based on PCDs
    ;
    %define SEC_TOP_OF_STACK (FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) + \
                          FixedPcdGet32 (PcdOvmfSecPeiTempRamSize))
    mov     rsp, SEC_TOP_OF_STACK
    nop

    ;
    ; Setup parameters and call SecCoreStartupWithStack
    ;   rcx: BootFirmwareVolumePtr
    ;   rdx: TopOfCurrentStack
    ;
    mov     rcx, rbp
    mov     rdx, rsp
    sub     rsp, 0x20
    call    ASM_PFX(SecCoreStartupWithStack)