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The VariableRuntimeDxe links with NvVarStoreFormattedLib which is required to establish the dependency on OvmfPkg\VirtNorFlashDxe. The VirtNorFlashDxe installs the gEdkiiNvVarStoreFormattedGuid to indicate it has finished initialising the flash variable storage and that the variable service can be dispatched. However, the kvmtool guest firmware dynamically detects if CFI flash is absent and sets PcdEmuVariableNvModeEnable to TRUE indicating emulated runtime variable must be used. Therefore, in this scenario install the gEdkiiNvVarStoreFormattedGuid so that the variable service can be dispatched. Also link the NorFlashKvmtoolLib as a NULL library so that it can discover if the CFI flash is absent and setup the PCD PcdEmuVariableNvModeEnable. This is required in case the NorFlashDxe is not yet dispatched. Signed-off-by: Sami Mujawar <sami.mujawar@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
94 lines
2.7 KiB
C
94 lines
2.7 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 - 2023, 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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if (PcdGetBool (PcdEmuVariableNvModeEnable)) {
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// The driver implementing the variable service can now be dispatched.
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Status = gBS->InstallProtocolInterface (
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&gImageHandle,
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&gEdkiiNvVarStoreFormattedGuid,
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EFI_NATIVE_INTERFACE,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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}
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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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