mirror of https://github.com/acidanthera/audk.git
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/** @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/PcdLib.h>
|
|
#include <Library/QemuFwCfgLib.h>
|
|
#include <Library/UefiBootServicesTableLib.h>
|
|
|
|
EFI_STATUS
|
|
EFIAPI
|
|
PlatformHasAcpiDt (
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
FIRMWARE_CONFIG_ITEM FwCfgItem;
|
|
UINTN FwCfgSize;
|
|
|
|
//
|
|
// 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) &&
|
|
!EFI_ERROR (
|
|
QemuFwCfgFindFile (
|
|
"etc/table-loader",
|
|
&FwCfgItem,
|
|
&FwCfgSize
|
|
)
|
|
)) {
|
|
//
|
|
// Only make ACPI available on 64-bit systems, and only if QEMU generates
|
|
// (a subset of) the ACPI tables.
|
|
//
|
|
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;
|
|
}
|