/** @file
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The KvmtoolPlatformDxe performs the platform specific initialization like:
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- It decides if the firmware should expose ACPI or Device Tree-based
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hardware description to the operating system.
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Copyright (c) 2018 - 2020, ARM Limited. All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Guid/VariableFormat.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Protocol/FdtClient.h>
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/** Decide if the firmware should expose ACPI tables or Device Tree and
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install the appropriate protocol interface.
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Note: This function is derived from "ArmVirtPkg/PlatformHasAcpiDtDxe",
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by dropping the word size check, and the fw_cfg check.
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@param [in] ImageHandle Handle for this image.
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@retval EFI_SUCCESS Success.
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@retval EFI_OUT_OF_RESOURCES There was not enough memory to install the
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protocols.
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@retval EFI_INVALID_PARAMETER A parameter is invalid.
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**/
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STATIC
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EFI_STATUS
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PlatformHasAcpiDt (
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IN EFI_HANDLE ImageHandle
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)
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{
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if (!PcdGetBool (PcdForceNoAcpi)) {
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// Expose ACPI tables
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return gBS->InstallProtocolInterface (
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&ImageHandle,
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&gEdkiiPlatformHasAcpiGuid,
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EFI_NATIVE_INTERFACE,
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NULL
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);
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}
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// Expose the Device Tree.
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return gBS->InstallProtocolInterface (
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&ImageHandle,
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&gEdkiiPlatformHasDeviceTreeGuid,
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EFI_NATIVE_INTERFACE,
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NULL
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);
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}
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/** Entry point for Kvmtool Platform Dxe
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@param [in] ImageHandle Handle for this image.
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@param [in] SystemTable Pointer to the EFI system table.
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@retval EFI_SUCCESS Success.
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@retval EFI_OUT_OF_RESOURCES There was not enough memory to install the
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protocols.
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@retval EFI_INVALID_PARAMETER A parameter is invalid.
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**/
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EFI_STATUS
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EFIAPI
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KvmtoolPlatformDxeEntryPoint (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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Status = PlatformHasAcpiDt (ImageHandle);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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