path: root/EdkNt32Pkg/Pei/FlashMap/FlashMap.c

/*++

Copyright (c) 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:

  FlashMap.c
   
Abstract:

  PEIM to build GUIDed HOBs for platform specific flash map

--*/


#include <FlashLayout.h>

EFI_STATUS
EFIAPI
GetAreaInfo (
  IN  EFI_PEI_SERVICES            **PeiServices,
  IN PEI_FLASH_MAP_PPI            *This,
  IN  EFI_FLASH_AREA_TYPE         AreaType,
  IN  EFI_GUID                    *AreaTypeGuid,
  OUT UINT32                      *NumEntries,
  OUT EFI_FLASH_SUBAREA_ENTRY     **Entries
  );

EFI_STATUS
EFIAPI
MemoryDiscoveredPpiNotifyCallback (
  IN EFI_PEI_SERVICES           **PeiServices,
  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDescriptor,
  IN VOID                       *Ppi
  );

//
// Module globals
//
static PEI_FLASH_MAP_PPI      mFlashMapPpi = { GetAreaInfo };

static EFI_PEI_PPI_DESCRIPTOR mPpiListFlashMap = {
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  &gPeiFlashMapPpiGuid,
  &mFlashMapPpi
};

static EFI_FLASH_AREA_DATA    mFlashAreaData[] = {
  //
  // Variable area
  //
  {
    EFI_VARIABLE_STORE_OFFSET,
    EFI_VARIABLE_STORE_LENGTH,
    EFI_FLASH_AREA_SUBFV | EFI_FLASH_AREA_MEMMAPPED_FV,
    EFI_FLASH_AREA_EFI_VARIABLES
  },
  //
  // FTW spare (backup) block
  //
  {
    EFI_WINNT_FTW_SPARE_BLOCK_OFFSET,
    EFI_WINNT_FTW_SPARE_BLOCK_LENGTH,
    EFI_FLASH_AREA_SUBFV | EFI_FLASH_AREA_MEMMAPPED_FV,
    EFI_FLASH_AREA_FTW_BACKUP
  },
  //
  // FTW private working (state) area
  //
  {
    EFI_FTW_WORKING_OFFSET,
    EFI_FTW_WORKING_LENGTH,
    EFI_FLASH_AREA_SUBFV | EFI_FLASH_AREA_MEMMAPPED_FV,
    EFI_FLASH_AREA_FTW_STATE
  },
  //
  // Recovery FV
  //
  {
    EFI_WINNT_FIRMWARE_OFFSET,
    EFI_WINNT_FIRMWARE_LENGTH,
    EFI_FLASH_AREA_FV | EFI_FLASH_AREA_MEMMAPPED_FV,
    EFI_FLASH_AREA_RECOVERY_BIOS
  },
  //
  // System Non-Volatile Storage FV
  //
  {
    EFI_WINNT_RUNTIME_UPDATABLE_OFFSET,
    EFI_WINNT_RUNTIME_UPDATABLE_LENGTH + EFI_WINNT_FTW_SPARE_BLOCK_LENGTH,
    EFI_FLASH_AREA_FV | EFI_FLASH_AREA_MEMMAPPED_FV,
    EFI_FLASH_AREA_GUID_DEFINED
  },
};


EFI_STATUS
EFIAPI
PeimInitializeFlashMap (
  IN EFI_FFS_FILE_HEADER       *FfsHeader,
  IN EFI_PEI_SERVICES          **PeiServices
  )
/*++

Routine Description:
  Build GUIDed HOBs for platform specific flash map
  
Arguments:
  FfsHeader   - A pointer to the EFI_FFS_FILE_HEADER structure.
  PeiServices - General purpose services available to every PEIM.
    
Returns:
  EFI_STATUS

--*/
// TODO:    EFI_SUCCESS - add return value to function comment
{
  EFI_STATUS              Status;
  NT_FWH_PPI              *NtFwhPpi;
  EFI_PEI_PPI_DESCRIPTOR  *PpiDescriptor;
  EFI_PHYSICAL_ADDRESS    FdBase;
  UINT64                  FdSize;
  UINTN                   NumOfHobData;
  UINTN                   Index;
  EFI_FLASH_AREA_HOB_DATA FlashHobData;

  DEBUG ((EFI_D_ERROR, "NT 32 Flash Map PEIM Loaded\n"));

  //
  // Install FlashMap PPI
  //
  Status = PeiServicesInstallPpi (&mPpiListFlashMap);
  ASSERT_EFI_ERROR (Status);


  //
  // Get the Fwh Information PPI
  //
  Status = PeiServicesLocatePpi (
            &gNtFwhPpiGuid, // GUID
            0,              // INSTANCE
            &PpiDescriptor, // EFI_PEI_PPI_DESCRIPTOR
            &NtFwhPpi       // PPI
            );
  ASSERT_EFI_ERROR (Status);

  //
  // Assume that FD0 contains the Flash map.
  //
  Status = NtFwhPpi->NtFwh (0, &FdBase, &FdSize);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Get number of types
  //
  NumOfHobData = sizeof (mFlashAreaData) / sizeof (EFI_FLASH_AREA_DATA);

  //
  // Build flash area entries as GUIDed HOBs.
  //
  for (Index = 0; Index < NumOfHobData; Index++) {
    (*PeiServices)->SetMem (&FlashHobData, sizeof (EFI_FLASH_AREA_HOB_DATA), 0);

    FlashHobData.AreaType               = mFlashAreaData[Index].AreaType;
    FlashHobData.NumberOfEntries        = 1;
    FlashHobData.SubAreaData.Attributes = mFlashAreaData[Index].Attributes;
    FlashHobData.SubAreaData.Base       = FdBase + (EFI_PHYSICAL_ADDRESS) (UINTN) mFlashAreaData[Index].Base;
    FlashHobData.SubAreaData.Length     = (EFI_PHYSICAL_ADDRESS) (UINTN) mFlashAreaData[Index].Length;

    switch (FlashHobData.AreaType) {
    case EFI_FLASH_AREA_RECOVERY_BIOS:
    case EFI_FLASH_AREA_MAIN_BIOS:
      (*PeiServices)->CopyMem (
                        &FlashHobData.AreaTypeGuid,
                        &gEfiFirmwareFileSystemGuid,
                        sizeof (EFI_GUID)
                        );
      (*PeiServices)->CopyMem (
                        &FlashHobData.SubAreaData.FileSystem,
                        &gEfiFirmwareVolumeBlockProtocolGuid,
                        sizeof (EFI_GUID)
                        );
      break;

    case EFI_FLASH_AREA_GUID_DEFINED:
      (*PeiServices)->CopyMem (
                        &FlashHobData.AreaTypeGuid,
                        &gEfiSystemNvDataHobGuid,
                        sizeof (EFI_GUID)
                        );
      (*PeiServices)->CopyMem (
                        &FlashHobData.SubAreaData.FileSystem,
                        &gEfiFirmwareVolumeBlockProtocolGuid,
                        sizeof (EFI_GUID)
                        );

      //
      // We also update a PCD entry so that any driver that depend on
      // PCD entry PcdFlashNvStorageVariableBase will get the information.
      //
      PcdSet32 (PcdFlashNvStorageVariableBase, (UINT32) FlashHobData.SubAreaData.Base);
      break;

    default:
      break;
    }

    BuildGuidDataHob (
      &gEfiFlashMapHobGuid,
      &FlashHobData,
      sizeof (EFI_FLASH_AREA_HOB_DATA)
      );
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
GetAreaInfo (
  IN  EFI_PEI_SERVICES            **PeiServices,
  IN PEI_FLASH_MAP_PPI            *This,
  IN  EFI_FLASH_AREA_TYPE         AreaType,
  IN  EFI_GUID                    *AreaTypeGuid,
  OUT UINT32                      *NumEntries,
  OUT EFI_FLASH_SUBAREA_ENTRY     **Entries
  )
/*++

  Routine Description:    
    Implementation of Flash Map PPI
    
--*/
// TODO: function comment is missing 'Arguments:'
// TODO: function comment is missing 'Returns:'
// TODO:    PeiServices - add argument and description to function comment
// TODO:    This - add argument and description to function comment
// TODO:    AreaType - add argument and description to function comment
// TODO:    AreaTypeGuid - add argument and description to function comment
// TODO:    NumEntries - add argument and description to function comment
// TODO:    Entries - add argument and description to function comment
// TODO:    EFI_SUCCESS - add return value to function comment
// TODO:    EFI_NOT_FOUND - add return value to function comment
{
  EFI_STATUS                    Status;
  EFI_PEI_HOB_POINTERS          Hob;
  EFI_HOB_FLASH_MAP_ENTRY_TYPE  *FlashMapEntry;

  Status = PeiServicesGetHobList (&Hob.Raw);
  while (!END_OF_HOB_LIST (Hob)) {
    if (Hob.Header->HobType == EFI_HOB_TYPE_GUID_EXTENSION && CompareGuid (&Hob.Guid->Name, &gEfiFlashMapHobGuid)) {
      FlashMapEntry = (EFI_HOB_FLASH_MAP_ENTRY_TYPE *) Hob.Raw;
      if (AreaType == FlashMapEntry->AreaType) {
        if (AreaType == EFI_FLASH_AREA_GUID_DEFINED) {
          if (!CompareGuid (AreaTypeGuid, &FlashMapEntry->AreaTypeGuid)) {
            continue;
          }
        }

        *NumEntries = FlashMapEntry->NumEntries;
        *Entries    = FlashMapEntry->Entries;
        return EFI_SUCCESS;
      }
    }

    Hob.Raw = GET_NEXT_HOB (Hob);
  }

  return EFI_NOT_FOUND;
}