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- /** @file
- Decide whether the firmware should expose an ACPI- and/or a Device Tree-based
- hardware description to the operating system.
- Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
- 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/PcdLib.h>
- #include <Library/UefiBootServicesTableLib.h>
- /** Entry point for the Cloud Hypervisor PlatformHasAcpiDtDxe.
- @param [in] ImageHandle Handle for this image.
- @param [in] SystemTable Pointer to the EFI system table.
- @return EFI_SUCCESS If ACPI or Device Tree based hardware
- description protocol was installed.
- @return EFI_INVALID_PARAMETER A parameter was invalid.
- @return EFI_OUT_OF_RESOURCES Insufficient resources exist to complete
- the request.
- **/
- EFI_STATUS
- EFIAPI
- PlatformHasAcpiDt (
- 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.
- //
- if ((MAX_UINTN == MAX_UINT64) &&
- !PcdGetBool (PcdForceNoAcpi))
- {
- Status = gBS->InstallProtocolInterface (
- &ImageHandle,
- &gEdkiiPlatformHasAcpiGuid,
- EFI_NATIVE_INTERFACE,
- NULL
- );
- if (EFI_ERROR (Status)) {
- goto Failed;
- }
- return Status;
- }
- //
- // Expose the Device Tree otherwise.
- //
- 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;
- }
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