39d76b2596
Kvmtool is a virtual machine manager that enables hosting KVM guests. It essentially provides a virtual hardware platform for guest operating systems. Kvmtool hands of a device tree containing the current hardware configuration to the firmware. A standards-based operating system would use ACPI to consume the platform hardware information, while some operating systems may prefer to use Device Tree. The KvmtoolPlatformDxe performs the platform actions like determining if the firmware should expose ACPI or the Device Tree based hardware description to the operating system. Signed-off-by: Sami Mujawar <sami.mujawar@arm.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/** @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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