| /** @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; | |
| } |