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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) 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;
}
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