UefiPayloadPkg/SecCore/Ia32/SecEntry.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Abstract:
   7 ;
   8 ;   Entry point for the coreboot UEFI payload.
   9 ;
  10 ;------------------------------------------------------------------------------
  11
  12 SECTION .text
  13
  14 ; C Functions
  15 extern  ASM_PFX(SecStartup)
  16
  17 ; Pcds
  18 extern  ASM_PFX(PcdGet32 (PcdPayloadFdMemBase))
  19 extern  ASM_PFX(PcdGet32 (PcdPayloadStackTop))
  20
  21 ;
  22 ; SecCore Entry Point
  23 ;
  24 ; Processor is in flat protected mode
  25 ;
  26 ; @param[in]  EAX   Initial value of the EAX register (BIST: Built-in Self Test)
  27 ; @param[in]  DI    'BP': boot-strap processor, or 'AP': application processor
  28 ; @param[in]  EBP   Pointer to the start of the Boot Firmware Volume
  29 ;
  30 ; @return     None  This routine does not return
  31 ;
  32 global ASM_PFX(_ModuleEntryPoint)
  33 ASM_PFX(_ModuleEntryPoint):
  34   ;
  35   ; Disable all the interrupts
  36   ;
  37   cli
  38
  39   ;
  40   ; Save the Payload HOB base address before switching the stack
  41   ;
  42   mov     eax, [esp + 4]
  43
  44   ;
  45   ; Construct the temporary memory at 0x80000, length 0x10000
  46   ;
  47   mov     esp, DWORD [ASM_PFX(PcdGet32 (PcdPayloadStackTop))]
  48
  49   ;
  50   ; Push the Payload HOB base address onto new stack
  51   ;
  52   push    eax
  53
  54   ;
  55   ; Pass BFV into the PEI Core
  56   ;
  57   push    DWORD [ASM_PFX(PcdGet32 (PcdPayloadFdMemBase))]
  58
  59   ;
  60   ; Pass stack base into the PEI Core
  61   ;
  62   push    BASE_512KB
  63
  64   ;
  65   ; Pass stack size into the PEI Core
  66   ;
  67   push    SIZE_64KB
  68
  69   ;
  70   ; Pass Control into the PEI Core
  71   ;
  72   call    ASM_PFX(SecStartup)
  73
  74   ;
  75   ; Should never return
  76   ;
  77   jmp     $
  78