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/** @file
Produces the Legacy Region Protocol.
This generic implementation of the Legacy Region Protocol does not actually
perform any lock/unlock operations. This module may be used on platforms
that do not provide HW locking of the legacy memory regions. It can also
be used as a template driver for implementing the Legacy Region Protocol on
a platform that does support HW locking of the legacy memory regions.
Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <PiDxe.h>
#include <Protocol/LegacyRegion.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
/**
Sets hardware to decode or not decode a region.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
@param Start Start of region to decode.
@param Length Size in bytes of the region.
@param On Decode/nondecode flag.
@retval EFI_SUCCESS Decode range successfully changed.
**/
EFI_STATUS
EFIAPI
LegacyRegionDecode (
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
IN BOOLEAN *On
)
{
return EFI_SUCCESS;
}
/**
Sets a region to read only.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
@param Start Start of region to lock.
@param Length Size in bytes of the region.
@param Granularity Lock attribute affects this granularity in bytes.
@retval EFI_SUCCESS The region was made read only.
**/
EFI_STATUS
EFIAPI
LegacyRegionLock (
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity OPTIONAL
)
{
return EFI_SUCCESS;
}
/**
Sets a region to read only and ensures that flash is locked from being
inadvertently modified.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
@param Start Start of region to lock.
@param Length Size in bytes of the region.
@param Granularity Lock attribute affects this granularity in bytes.
@retval EFI_SUCCESS The region was made read only and flash is locked.
**/
EFI_STATUS
EFIAPI
LegacyRegionBootLock (
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity OPTIONAL
)
{
return EFI_SUCCESS;
}
/**
Sets a region to read-write.
@param This Indicates the EFI_LEGACY_REGION_PROTOCOL instance
@param Start Start of region to lock.
@param Length Size in bytes of the region.
@param Granularity Lock attribute affects this granularity in bytes.
@retval EFI_SUCCESS The region was successfully made read-write.
**/
EFI_STATUS
EFIAPI
LegacyRegionUnlock (
IN EFI_LEGACY_REGION_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity OPTIONAL
)
{
return EFI_SUCCESS;
}
//
// Module global for the handle the Legacy Region Protocol is installed
//
EFI_HANDLE mLegacyRegionHandle = NULL;
//
// Module global for the Legacy Region Protocol instance that is installed onto
// mLegacyRegionHandle
//
EFI_LEGACY_REGION_PROTOCOL mLegacyRegion = {
LegacyRegionDecode,
LegacyRegionLock,
LegacyRegionBootLock,
LegacyRegionUnlock
};
/**
The user Entry Point for module LegacyRegionDxe. The user code starts with this function.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval other Some error occurs when executing this entry point.
**/
EFI_STATUS
EFIAPI
LegacyRegionInstall (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
//
// Make sure the Legacy Region Protocol is not already installed in the system
//
ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyRegionProtocolGuid);
//
// Install the protocol on a new handle.
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mLegacyRegionHandle,
&gEfiLegacyRegionProtocolGuid, &mLegacyRegion,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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