mirror of https://github.com/acidanthera/audk.git
165 lines
4.7 KiB
C
165 lines
4.7 KiB
C
/** @file
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Produces the Legacy Region Protocol.
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This generic implementation of the Legacy Region Protocol does not actually
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perform any lock/unlock operations. This module may be used on platforms
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that do not provide HW locking of the legacy memory regions. It can also
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be used as a template driver for implementing the Legacy Region Protocol on
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a platform that does support HW locking of the legacy memory regions.
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Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiDxe.h>
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#include <Protocol/LegacyRegion.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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/**
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Sets hardware to decode or not decode a region.
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@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
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@param Start Start of region to decode.
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@param Length Size in bytes of the region.
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@param On Decode/nondecode flag.
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@retval EFI_SUCCESS Decode range successfully changed.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegionDecode (
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IN EFI_LEGACY_REGION_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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IN BOOLEAN *On
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)
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{
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return EFI_SUCCESS;
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}
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/**
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Sets a region to read only.
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@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
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@param Start Start of region to lock.
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@param Length Size in bytes of the region.
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@param Granularity Lock attribute affects this granularity in bytes.
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@retval EFI_SUCCESS The region was made read only.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegionLock (
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IN EFI_LEGACY_REGION_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity OPTIONAL
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)
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{
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return EFI_SUCCESS;
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}
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/**
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Sets a region to read only and ensures that flash is locked from being
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inadvertently modified.
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@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
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@param Start Start of region to lock.
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@param Length Size in bytes of the region.
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@param Granularity Lock attribute affects this granularity in bytes.
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@retval EFI_SUCCESS The region was made read only and flash is locked.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegionBootLock (
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IN EFI_LEGACY_REGION_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity OPTIONAL
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)
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{
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return EFI_SUCCESS;
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}
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/**
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Sets a region to read-write.
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@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
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@param Start Start of region to lock.
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@param Length Size in bytes of the region.
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@param Granularity Lock attribute affects this granularity in bytes.
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@retval EFI_SUCCESS The region was successfully made read-write.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegionUnlock (
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IN EFI_LEGACY_REGION_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity OPTIONAL
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)
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{
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return EFI_SUCCESS;
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}
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//
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// Module global for the handle the Legacy Region Protocol is installed
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//
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EFI_HANDLE mLegacyRegionHandle = NULL;
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//
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// Module global for the Legacy Region Protocol instance that is installed onto
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// mLegacyRegionHandle
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//
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EFI_LEGACY_REGION_PROTOCOL mLegacyRegion = {
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LegacyRegionDecode,
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LegacyRegionLock,
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LegacyRegionBootLock,
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LegacyRegionUnlock
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};
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/**
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The user Entry Point for module LegacyRegionDxe. The user code starts with this function.
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@param[in] ImageHandle The firmware allocated handle for the EFI image.
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@param[in] SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The entry point is executed successfully.
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@retval other Some error occurs when executing this entry point.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegionInstall (
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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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//
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// Make sure the Legacy Region Protocol is not already installed in the system
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//
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ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyRegionProtocolGuid);
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//
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// Install the protocol on a new handle.
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//
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Status = gBS->InstallMultipleProtocolInterfaces (
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&mLegacyRegionHandle,
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&gEfiLegacyRegionProtocolGuid, &mLegacyRegion,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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