EmbeddedPkg/Library/DxeDtPlatformDtbLoaderLibDefault/DxeDtPlatformDtbLoaderLibDefault.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2017, Linaro, Ltd. All rights reserved.
   4 *
   5 *  SPDX-License-Identifier: BSD-2-Clause-Patent
   6 *
   7 **/
   8
   9 #include <PiDxe.h>
  10
  11 #include <Library/BaseLib.h>
  12 #include <Library/DxeServicesLib.h>
  13 #include <Library/MemoryAllocationLib.h>
  14
  15 /**
  16   Return a pool allocated copy of the DTB image that is appropriate for
  17   booting the current platform via DT.
  18
  19   @param[out]   Dtb                   Pointer to the DTB copy
  20   @param[out]   DtbSize               Size of the DTB copy
  21
  22   @retval       EFI_SUCCESS           Operation completed successfully
  23   @retval       EFI_NOT_FOUND         No suitable DTB image could be located
  24   @retval       EFI_OUT_OF_RESOURCES  No pool memory available
  25
  26 **/
  27 EFI_STATUS
  28 EFIAPI
  29 DtPlatformLoadDtb (
  30   OUT   VOID        **Dtb,
  31   OUT   UINTN       *DtbSize
  32   )
  33 {
  34   EFI_STATUS      Status;
  35   VOID            *OrigDtb;
  36   VOID            *CopyDtb;
  37   UINTN           OrigDtbSize;
  38
  39   Status = GetSectionFromAnyFv (&gDtPlatformDefaultDtbFileGuid,
  40              EFI_SECTION_RAW, 0, &OrigDtb, &OrigDtbSize);
  41   if (EFI_ERROR (Status)) {
  42     return EFI_NOT_FOUND;
  43   }
  44
  45   CopyDtb = AllocateCopyPool (OrigDtbSize, OrigDtb);
  46   if (CopyDtb == NULL) {
  47     return EFI_OUT_OF_RESOURCES;
  48   }
  49
  50   *Dtb = CopyDtb;
  51   *DtbSize = OrigDtbSize;
  52
  53   return EFI_SUCCESS;
  54 }