EmbeddedPkg/Library/DxeDtPlatformDtbLoaderLibDefault/DxeDtPlatformDtbLoaderLibDefault.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2017, Linaro, Ltd. All rights reserved.
   4 *
   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 #include <PiDxe.h>
  16
  17 #include <Library/BaseLib.h>
  18 #include <Library/DxeServicesLib.h>
  19 #include <Library/MemoryAllocationLib.h>
  20
  21 /**
  22   Return a pool allocated copy of the DTB image that is appropriate for
  23   booting the current platform via DT.
  24
  25   @param[out]   Dtb                   Pointer to the DTB copy
  26   @param[out]   DtbSize               Size of the DTB copy
  27
  28   @retval       EFI_SUCCESS           Operation completed successfully
  29   @retval       EFI_NOT_FOUND         No suitable DTB image could be located
  30   @retval       EFI_OUT_OF_RESOURCES  No pool memory available
  31
  32 **/
  33 EFI_STATUS
  34 EFIAPI
  35 DtPlatformLoadDtb (
  36   OUT   VOID        **Dtb,
  37   OUT   UINTN       *DtbSize
  38   )
  39 {
  40   EFI_STATUS      Status;
  41   VOID            *OrigDtb;
  42   VOID            *CopyDtb;
  43   UINTN           OrigDtbSize;
  44
  45   Status = GetSectionFromAnyFv (&gDtPlatformDefaultDtbFileGuid,
  46              EFI_SECTION_RAW, 0, &OrigDtb, &OrigDtbSize);
  47   if (EFI_ERROR (Status)) {
  48     return EFI_NOT_FOUND;
  49   }
  50
  51   CopyDtb = AllocateCopyPool (OrigDtbSize, OrigDtb);
  52   if (CopyDtb == NULL) {
  53     return EFI_OUT_OF_RESOURCES;
  54   }
  55
  56   *Dtb = CopyDtb;
  57   *DtbSize = OrigDtbSize;
  58
  59   return EFI_SUCCESS;
  60 }