/** @file

  Copyright (c) 2013-2014, ARM Ltd. All rights reserved.<BR>
  Copyright (c) 2017, Linaro. 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.

**/

#include <Library/AndroidBootImgLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>

#include <Protocol/BlockIo.h>
#include <Protocol/DevicePathFromText.h>

/* Validate the node is media hard drive type */
EFI_STATUS
ValidateAndroidMediaDevicePath (
  IN EFI_DEVICE_PATH                  *DevicePath
  )
{
  EFI_DEVICE_PATH_PROTOCOL            *Node, *NextNode;

  NextNode = DevicePath;
  while (NextNode != NULL) {
    Node = NextNode;
    if (Node->Type == MEDIA_DEVICE_PATH &&
        Node->SubType == MEDIA_HARDDRIVE_DP) {
      return EFI_SUCCESS;
    }
    NextNode = NextDevicePathNode (Node);
  }
  return EFI_INVALID_PARAMETER;
}

EFI_STATUS
EFIAPI
AndroidBootAppEntryPoint (
  IN EFI_HANDLE                            ImageHandle,
  IN EFI_SYSTEM_TABLE                      *SystemTable
  )
{
  EFI_STATUS                          Status;
  CHAR16                              *BootPathStr;
  EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL  *EfiDevicePathFromTextProtocol;
  EFI_DEVICE_PATH                     *DevicePath;
  EFI_BLOCK_IO_PROTOCOL               *BlockIo;
  UINT32                              MediaId, BlockSize;
  VOID                                *Buffer;
  EFI_HANDLE                          Handle;
  UINTN                               BootImgSize;

  BootPathStr = (CHAR16 *)PcdGetPtr (PcdAndroidBootDevicePath);
  ASSERT (BootPathStr != NULL);
  Status = gBS->LocateProtocol (&gEfiDevicePathFromTextProtocolGuid, NULL,
                                (VOID **)&EfiDevicePathFromTextProtocol);
  ASSERT_EFI_ERROR(Status);
  DevicePath = (EFI_DEVICE_PATH *)EfiDevicePathFromTextProtocol->ConvertTextToDevicePath (BootPathStr);
  ASSERT (DevicePath != NULL);

  Status = ValidateAndroidMediaDevicePath (DevicePath);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = gBS->LocateDevicePath (&gEfiDevicePathProtocolGuid,
                                  &DevicePath, &Handle);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = gBS->OpenProtocol (
                  Handle,
                  &gEfiBlockIoProtocolGuid,
                  (VOID **) &BlockIo,
                  gImageHandle,
                  NULL,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "Failed to get BlockIo: %r\n", Status));
    return Status;
  }

  MediaId = BlockIo->Media->MediaId;
  BlockSize = BlockIo->Media->BlockSize;
  Buffer = AllocatePages (EFI_SIZE_TO_PAGES (sizeof(ANDROID_BOOTIMG_HEADER)));
  if (Buffer == NULL) {
    return EFI_BUFFER_TOO_SMALL;
  }
  /* Load header of boot.img */
  Status = BlockIo->ReadBlocks (
                      BlockIo,
                      MediaId,
                      0,
                      BlockSize,
                      Buffer
                      );
  Status = AndroidBootImgGetImgSize (Buffer, &BootImgSize);
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "Failed to get AndroidBootImg Size: %r\n", Status));
    return Status;
  }
  BootImgSize = ALIGN_VALUE (BootImgSize, BlockSize);
  FreePages (Buffer, EFI_SIZE_TO_PAGES (sizeof(ANDROID_BOOTIMG_HEADER)));

  /* Both PartitionStart and PartitionSize are counted as block size. */
  Buffer = AllocatePages (EFI_SIZE_TO_PAGES (BootImgSize));
  if (Buffer == NULL) {
    return EFI_BUFFER_TOO_SMALL;
  }

  /* Load header of boot.img */
  Status = BlockIo->ReadBlocks (
                      BlockIo,
                      MediaId,
                      0,
                      BootImgSize,
                      Buffer
                      );
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "Failed to read blocks: %r\n", Status));
    goto EXIT;
  }

  Status = AndroidBootImgBoot (Buffer, BootImgSize);

EXIT:
  return Status;
}