/** @file | |
Decide whether the firmware should expose an ACPI- and/or a Device Tree-based | |
hardware description to the operating system. | |
Copyright (c) 2017, Red Hat, Inc. | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <Guid/PlatformHasAcpi.h> | |
#include <Guid/PlatformHasDeviceTree.h> | |
#include <Library/BaseLib.h> | |
#include <Library/DebugLib.h> | |
#include <Library/UefiBootServicesTableLib.h> | |
EFI_STATUS | |
EFIAPI | |
XenPlatformHasAcpiDt ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
EFI_STATUS Status; | |
// | |
// If we fail to install any of the necessary protocols below, the OS will be | |
// unbootable anyway (due to lacking hardware description), so tolerate no | |
// errors here. | |
// | |
// Always make ACPI available on 64-bit systems. | |
// | |
if (MAX_UINTN == MAX_UINT64) { | |
Status = gBS->InstallProtocolInterface ( | |
&ImageHandle, | |
&gEdkiiPlatformHasAcpiGuid, | |
EFI_NATIVE_INTERFACE, | |
NULL | |
); | |
if (EFI_ERROR (Status)) { | |
goto Failed; | |
} | |
} | |
// | |
// Expose the Device Tree unconditionally. | |
// | |
Status = gBS->InstallProtocolInterface ( | |
&ImageHandle, | |
&gEdkiiPlatformHasDeviceTreeGuid, | |
EFI_NATIVE_INTERFACE, | |
NULL | |
); | |
if (EFI_ERROR (Status)) { | |
goto Failed; | |
} | |
return Status; | |
Failed: | |
ASSERT_EFI_ERROR (Status); | |
CpuDeadLoop (); | |
// | |
// Keep compilers happy. | |
// | |
return Status; | |
} |