system76-edk2/ArmPkg/Library/LinuxBootBootManagerLib/LinuxBootBm.c

/** @file
  Implementation for PlatformBootManagerLib library class interfaces.

  Copyright (C) 2015-2016, Red Hat, Inc.
  Copyright (c) 2014 - 2019, ARM Ltd. All rights reserved.<BR>
  Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
  Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
  Copyright (c) 2020 - 2021, Ampere Computing LLC. All rights reserved.<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <Uefi.h>

#include <Guid/EventGroup.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootManagerLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/PlatformBootManager.h>

/**
  Register a boot option using a file GUID in the FV.

  @param  FileGuid     The file GUID name in the FV.
  @param  Description  The description of the boot option.
  @param  Attributes   The attributes of the boot option.

**/
STATIC
VOID
PlatformRegisterFvBootOption (
  CONST EFI_GUID  *FileGuid,
  CHAR16          *Description,
  UINT32          Attributes
  )
{
  EFI_STATUS                         Status;
  INTN                               OptionIndex;
  EFI_BOOT_MANAGER_LOAD_OPTION       NewOption;
  EFI_BOOT_MANAGER_LOAD_OPTION       *BootOptions;
  UINTN                              BootOptionCount;
  MEDIA_FW_VOL_FILEPATH_DEVICE_PATH  FileNode;
  EFI_LOADED_IMAGE_PROTOCOL          *LoadedImage;
  EFI_DEVICE_PATH_PROTOCOL           *DevicePath;

  Status = gBS->HandleProtocol (
                  gImageHandle,
                  &gEfiLoadedImageProtocolGuid,
                  (VOID **)&LoadedImage
                  );
  ASSERT_EFI_ERROR (Status);

  EfiInitializeFwVolDevicepathNode (&FileNode, FileGuid);
  DevicePath = DevicePathFromHandle (LoadedImage->DeviceHandle);
  ASSERT (DevicePath != NULL);
  DevicePath = AppendDevicePathNode (
                 DevicePath,
                 (EFI_DEVICE_PATH_PROTOCOL *)&FileNode
                 );
  ASSERT (DevicePath != NULL);

  Status = EfiBootManagerInitializeLoadOption (
             &NewOption,
             LoadOptionNumberUnassigned,
             LoadOptionTypeBoot,
             Attributes,
             Description,
             DevicePath,
             NULL,
             0
             );
  ASSERT_EFI_ERROR (Status);
  FreePool (DevicePath);

  BootOptions = EfiBootManagerGetLoadOptions (
                  &BootOptionCount,
                  LoadOptionTypeBoot
                  );

  OptionIndex = EfiBootManagerFindLoadOption (
                  &NewOption,
                  BootOptions,
                  BootOptionCount
                  );

  if (OptionIndex == -1) {
    Status = EfiBootManagerAddLoadOptionVariable (&NewOption, MAX_UINTN);
    ASSERT_EFI_ERROR (Status);
  }

  EfiBootManagerFreeLoadOption (&NewOption);
  EfiBootManagerFreeLoadOptions (BootOptions, BootOptionCount);
}

/**
  Do the platform specific action before the console is connected.

  Such as:
    Update console variable;
    Register new Driver#### or Boot####;
    Signal ReadyToLock event.
**/
VOID
EFIAPI
PlatformBootManagerBeforeConsole (
  VOID
  )
{
  //
  // Signal EndOfDxe PI Event
  //
  EfiEventGroupSignal (&gEfiEndOfDxeEventGroupGuid);
}

/**
  Do the platform specific action after the console is connected.

  Such as:
    Dynamically switch output mode;
    Signal console ready platform customized event;
    Run diagnostics like memory testing;
    Connect certain devices;
    Dispatch additional option roms.
**/
VOID
EFIAPI
PlatformBootManagerAfterConsole (
  VOID
  )
{
  EFI_GUID  LinuxBootFileGuid;

  CopyGuid (&LinuxBootFileGuid, PcdGetPtr (PcdLinuxBootFileGuid));

  if (!CompareGuid (&LinuxBootFileGuid, &gZeroGuid)) {
    //
    // Register LinuxBoot
    //
    PlatformRegisterFvBootOption (
      &LinuxBootFileGuid,
      L"LinuxBoot",
      LOAD_OPTION_ACTIVE
      );
  } else {
    DEBUG ((DEBUG_ERROR, "%a: PcdLinuxBootFileGuid was not set!\n", __FUNCTION__));
  }
}

/**
  This function is called each second during the boot manager waits the
  timeout.

  @param TimeoutRemain  The remaining timeout.
**/
VOID
EFIAPI
PlatformBootManagerWaitCallback (
  UINT16  TimeoutRemain
  )
{
  return;
}

/**
  The function is called when no boot option could be launched,
  including platform recovery options and options pointing to applications
  built into firmware volumes.

  If this function returns, BDS attempts to enter an infinite loop.
**/
VOID
EFIAPI
PlatformBootManagerUnableToBoot (
  VOID
  )
{
  return;
}