MdePkg/Library/PeiCoreEntryPoint/PeiCoreEntryPoint.c

   1 /** @file
   2   Entry point to a the PEI Core.
   3
   4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php.
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15
  16 #include <PiPei.h>
  17
  18 //
  19 // The Library classes this module produced
  20 //
  21 #include <Library/PeiCoreEntryPoint.h>
  22 #include <Library/BaseLib.h>
  23 #include <Library/DebugLib.h>
  24
  25 /**
  26   The entry point of PE/COFF Image for the PEI Core.
  27
  28   This function is the entry point for the PEI Foundation, which allows the SEC phase
  29   to pass information about the stack, temporary RAM and the Boot Firmware Volume.
  30   In addition, it also allows the SEC phase to pass services and data forward for use
  31   during the PEI phase in the form of one or more PPIs.
  32   There is no limit to the number of additional PPIs that can be passed from SEC into
  33   the PEI Foundation. As part of its initialization phase, the PEI Foundation will add
  34   these SEC-hosted PPIs to its PPI database such that both the PEI Foundation and any
  35   modules can leverage the associated service calls and/or code in these early PPIs.
  36   This function is required to call ProcessModuleEntryPointList() with the Context
  37   parameter set to NULL.  ProcessModuleEntryPoint() is never expected to return.
  38   The PEI Core is responsible for calling ProcessLibraryConstructorList() as soon as
  39   the PEI Services Table and the file handle for the PEI Core itself have been established.
  40   If ProcessModuleEntryPointList() returns, then ASSERT() and halt the system.
  41
  42   @param SecCoreData  Points to a data structure containing information about the
  43                       PEI core's operating environment, such as the size and
  44                       location of temporary RAM, the stack location and the BFV
  45                       location.
  46
  47   @param PpiList      Points to a list of one or more PPI descriptors to be
  48                       installed initially by the PEI core. An empty PPI list
  49                       consists of a single descriptor with the end-tag
  50                       EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST.
  51                       As part of its initialization phase, the PEI Foundation will
  52                       add these SEC-hosted PPIs to its PPI database, such that both
  53                       the PEI Foundation and any modules can leverage the associated
  54                       service calls and/or code in these early PPIs.
  55
  56 **/
  57 VOID
  58 EFIAPI
  59 _ModuleEntryPoint(
  60   IN CONST  EFI_SEC_PEI_HAND_OFF    *SecCoreData,
  61   IN CONST  EFI_PEI_PPI_DESCRIPTOR  *PpiList
  62 )
  63 {
  64   ProcessModuleEntryPointList (SecCoreData, PpiList, NULL);
  65
  66   //
  67   // Should never return
  68   //
  69   ASSERT(FALSE);
  70   CpuDeadLoop ();
  71 }
  72
  73
  74 /**
  75   Required by the EBC compiler and identical in functionality to _ModuleEntryPoint().
  76
  77   This function is required to call _ModuleEntryPoint() passing in SecCoreData and PpiList.
  78
  79   @param SecCoreData  Points to a data structure containing information about the PEI core's
  80                       operating environment, such as the size and location of temporary RAM,
  81                       the stack location and the BFV location.
  82
  83   @param PpiList      Points to a list of one or more PPI descriptors to be installed
  84                       initially by the PEI core.  An empty PPI list consists of
  85                       a single descriptor with the end-tag
  86                       EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST.
  87                       As part of its initialization phase, the PEI Foundation will
  88                       add these SEC-hosted PPIs to its PPI database, such that both
  89                       the PEI Foundationand any modules can leverage the associated
  90                       service calls and/or code in these early PPIs.
  91
  92 **/
  93 VOID
  94 EFIAPI
  95 EfiMain (
  96   IN CONST  EFI_SEC_PEI_HAND_OFF    *SecCoreData,
  97   IN CONST  EFI_PEI_PPI_DESCRIPTOR  *PpiList
  98   )
  99 {
 100   _ModuleEntryPoint (SecCoreData, PpiList);
 101 }