hob.c

EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是EFI BIOS源代码中的与平台无关部分的代码

/*++

Copyright (c) 2004 - 2006, Intel Corporation                                                         
All rights reserved. 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.             

Module Name:

  Hob.c

Abstract:

  EFI PEI Core HOB services

--*/

#include "Tiano.h"
#include "PeiCore.h"
#include "PeiLib.h"

EFI_STATUS
EFIAPI
PeiGetHobList (
  IN EFI_PEI_SERVICES  **PeiServices,
  IN OUT VOID          **HobList
  )
/*++

Routine Description:

  Gets the pointer to the HOB List.

Arguments:

  PeiServices - The PEI core services table.
  HobList     - Pointer to the HOB List.

Returns:

  EFI_SUCCESS                 - Get the pointer of HOB List
  EFI_NOT_AVAILABLE_YET       - the HOB List is not yet published
  EFI_INVALID_PARAMETER       - HobList is NULL (in debug mode)
            
--*/
{
  PEI_CORE_INSTANCE *PrivateData;

  
  //
  // Only check this parameter in debug mode
  //
  
  PEI_DEBUG_CODE (  
    if (HobList == NULL) {
      return EFI_INVALID_PARAMETER;
    }
  )  
  
  PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);

  *HobList = PrivateData->HobList.Raw;


  return EFI_SUCCESS;   
}


EFI_STATUS
EFIAPI
PeiCreateHob (
  IN EFI_PEI_SERVICES  **PeiServices,
  IN UINT16            Type,
  IN UINT16            Length,
  IN OUT VOID          **Hob
  )
/*++

Routine Description:

  Add a new HOB to the HOB List.

Arguments:

  PeiServices - The PEI core services table.
  Type        - Type of the new HOB.
  Length      - Length of the new HOB to allocate.
  Hob         - Pointer to the new HOB.

Returns:

  Status  - EFI_SUCCESS
          - EFI_INVALID_PARAMETER if Hob is NULL
          - EFI_NOT_AVAILABLE_YET if HobList is still not available.
          - EFI_OUT_OF_RESOURCES if there is no more memory to grow the Hoblist.
            
--*/
{
  EFI_STATUS                           Status;
  EFI_HOB_HANDOFF_INFO_TABLE           *HandOffHob;
  EFI_HOB_GENERIC_HEADER               *HobEnd;
  EFI_PHYSICAL_ADDRESS                 FreeMemory;


  Status = PeiGetHobList (PeiServices, Hob);
  if (EFI_ERROR(Status)) {
    return Status;
  }

  HandOffHob = *Hob;

  Length = (UINT16)((Length + 0x7) & (~0x7));

  FreeMemory = HandOffHob->EfiFreeMemoryTop -
               HandOffHob->EfiFreeMemoryBottom;

  if (FreeMemory < Length) {
    PEI_DEBUG_CODE (
      {
        PEI_DEBUG ((PeiServices, EFI_D_ERROR, "PeiCreateHob fail: Length - 0x%08x\n", (UINTN)Length));
        PEI_DEBUG ((PeiServices, EFI_D_ERROR, "  FreeMemoryTop    - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryTop));
        PEI_DEBUG ((PeiServices, EFI_D_ERROR, "  FreeMemoryBottom - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryBottom));
      }
    )
    return EFI_OUT_OF_RESOURCES;
  }
  
  *Hob = (VOID*) (UINTN) HandOffHob->EfiEndOfHobList;
  ((EFI_HOB_GENERIC_HEADER*) *Hob)->HobType = Type;
  ((EFI_HOB_GENERIC_HEADER*) *Hob)->HobLength = Length;
  ((EFI_HOB_GENERIC_HEADER*) *Hob)->Reserved = 0;

  HobEnd = (EFI_HOB_GENERIC_HEADER*) ((UINTN) *Hob + Length);
  HandOffHob->EfiEndOfHobList = (EFI_PHYSICAL_ADDRESS) (UINTN) HobEnd;
 
  HobEnd->HobType   = EFI_HOB_TYPE_END_OF_HOB_LIST;
  HobEnd->HobLength = sizeof(EFI_HOB_GENERIC_HEADER);
  HobEnd->Reserved  = 0;
  HobEnd++;
  HandOffHob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS) (UINTN) HobEnd;


  return EFI_SUCCESS;   
}


EFI_STATUS
PeiCoreBuildHobHandoffInfoTable (
  IN EFI_BOOT_MODE         BootMode,
  IN EFI_PHYSICAL_ADDRESS  MemoryBegin,
  IN UINT64                MemoryLength
  )
/*++

Routine Description:

  Builds a Handoff Information Table HOB

Arguments:

  BootMode      - Current Bootmode
  MemoryBegin   - Start Memory Address.
  MemoryLength  - Length of Memory.

Returns:

  EFI_SUCCESS

--*/
{
  EFI_HOB_HANDOFF_INFO_TABLE   *Hob;
  EFI_HOB_GENERIC_HEADER              *HobEnd;

  Hob = (VOID *)(UINTN)MemoryBegin;
  HobEnd = (EFI_HOB_GENERIC_HEADER*) (Hob+1);
  Hob->Header.HobType  = EFI_HOB_TYPE_HANDOFF;
  Hob->Header.HobLength   = sizeof(EFI_HOB_HANDOFF_INFO_TABLE);
  Hob->Header.Reserved = 0;
  
  HobEnd->HobType     = EFI_HOB_TYPE_END_OF_HOB_LIST;
  HobEnd->HobLength   = sizeof(EFI_HOB_GENERIC_HEADER);
  HobEnd->Reserved    = 0;

  Hob->Version             = EFI_HOB_HANDOFF_TABLE_VERSION;
  Hob->BootMode            = BootMode;
  
  Hob->EfiMemoryTop        = MemoryBegin + MemoryLength;
  Hob->EfiMemoryBottom     = MemoryBegin;
  Hob->EfiFreeMemoryTop    = MemoryBegin + MemoryLength;
  Hob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS) (UINTN) (HobEnd+1);
  Hob->EfiEndOfHobList     = (EFI_PHYSICAL_ADDRESS) (UINTN) HobEnd;

  return EFI_SUCCESS;
}