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/** @file
Dummy implementation of Legacy Region 2 Protocol.
This generic implementation of the Legacy Region 2 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 2 Protocol on
a platform that does support HW locking of the legacy memory regions.
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <LegacyRegion2.h>
EFI_HANDLE mLegacyRegion2Handle = NULL;
EFI_LEGACY_REGION2_PROTOCOL mLegacyRegion2 = {
LegacyRegion2Decode,
LegacyRegion2Lock,
LegacyRegion2BootLock,
LegacyRegion2Unlock,
LegacyRegionGetInfo
};
/**
Modify the hardware to allow (decode) or disallow (not decode) memory reads in a region.
If the On parameter evaluates to TRUE, this function enables memory reads in the address range
Start to (Start + Length - 1).
If the On parameter evaluates to FALSE, this function disables memory reads in the address range
Start to (Start + Length - 1).
@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
@param Start[in] The beginning of the physical address of the region whose attributes
should be modified.
@param Length[in] The number of bytes of memory whose attributes should be modified.
The actual number of bytes modified may be greater than the number
specified.
@param Granularity[out] The number of bytes in the last region affected. This may be less
than the total number of bytes affected if the starting address
was not aligned to a region's starting address or if the length
was greater than the number of bytes in the first region.
@param On[in] Decode / Non-Decode flag.
@retval EFI_SUCCESS The region's attributes were successfully modified.
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
**/
EFI_STATUS
EFIAPI
LegacyRegion2Decode (
IN EFI_LEGACY_REGION2_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity,
IN BOOLEAN *On
)
{
if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
return EFI_INVALID_PARAMETER;
}
ASSERT (Granularity != NULL);
*Granularity = 0;
return EFI_SUCCESS;
}
/**
Modify the hardware to disallow memory writes in a region.
This function changes the attributes of a memory range to not allow writes.
@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
@param Start[in] The beginning of the physical address of the region whose
attributes should be modified.
@param Length[in] The number of bytes of memory whose attributes should be modified.
The actual number of bytes modified may be greater than the number
specified.
@param Granularity[out] The number of bytes in the last region affected. This may be less
than the total number of bytes affected if the starting address was
not aligned to a region's starting address or if the length was
greater than the number of bytes in the first region.
@retval EFI_SUCCESS The region's attributes were successfully modified.
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
**/
EFI_STATUS
EFIAPI
LegacyRegion2Lock (
IN EFI_LEGACY_REGION2_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity
)
{
if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
return EFI_INVALID_PARAMETER;
}
ASSERT (Granularity != NULL);
*Granularity = 0;
return EFI_SUCCESS;
}
/**
Modify the hardware to disallow memory attribute changes in a region.
This function makes the attributes of a region read only. Once a region is boot-locked with this
function, the read and write attributes of that region cannot be changed until a power cycle has
reset the boot-lock attribute. Calls to Decode(), Lock() and Unlock() will have no effect.
@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
@param Start[in] The beginning of the physical address of the region whose
attributes should be modified.
@param Length[in] The number of bytes of memory whose attributes should be modified.
The actual number of bytes modified may be greater than the number
specified.
@param Granularity[out] The number of bytes in the last region affected. This may be less
than the total number of bytes affected if the starting address was
not aligned to a region's starting address or if the length was
greater than the number of bytes in the first region.
@retval EFI_SUCCESS The region's attributes were successfully modified.
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
@retval EFI_UNSUPPORTED The chipset does not support locking the configuration registers in
a way that will not affect memory regions outside the legacy memory
region.
**/
EFI_STATUS
EFIAPI
LegacyRegion2BootLock (
IN EFI_LEGACY_REGION2_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity
)
{
if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
return EFI_INVALID_PARAMETER;
}
return EFI_UNSUPPORTED;
}
/**
Modify the hardware to allow memory writes in a region.
This function changes the attributes of a memory range to allow writes.
@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
@param Start[in] The beginning of the physical address of the region whose
attributes should be modified.
@param Length[in] The number of bytes of memory whose attributes should be modified.
The actual number of bytes modified may be greater than the number
specified.
@param Granularity[out] The number of bytes in the last region affected. This may be less
than the total number of bytes affected if the starting address was
not aligned to a region's starting address or if the length was
greater than the number of bytes in the first region.
@retval EFI_SUCCESS The region's attributes were successfully modified.
@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
**/
EFI_STATUS
EFIAPI
LegacyRegion2Unlock (
IN EFI_LEGACY_REGION2_PROTOCOL *This,
IN UINT32 Start,
IN UINT32 Length,
OUT UINT32 *Granularity
)
{
if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
return EFI_INVALID_PARAMETER;
}
ASSERT (Granularity != NULL);
*Granularity = 0;
return EFI_SUCCESS;
}
/**
Get region information for the attributes of the Legacy Region.
This function is used to discover the granularity of the attributes for the memory in the legacy
region. Each attribute may have a different granularity and the granularity may not be the same
for all memory ranges in the legacy region.
@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.
@param DescriptorCount[out] The number of region descriptor entries returned in the Descriptor
buffer.
@param Descriptor[out] A pointer to a pointer used to return a buffer where the legacy
region information is deposited. This buffer will contain a list of
DescriptorCount number of region descriptors. This function will
provide the memory for the buffer.
@retval EFI_SUCCESS The information structure was returned.
@retval EFI_UNSUPPORTED This function is not supported.
**/
EFI_STATUS
EFIAPI
LegacyRegionGetInfo (
IN EFI_LEGACY_REGION2_PROTOCOL *This,
OUT UINT32 *DescriptorCount,
OUT EFI_LEGACY_REGION_DESCRIPTOR **Descriptor
)
{
return EFI_UNSUPPORTED;
}
/**
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.
**/
EFI_STATUS
EFIAPI
LegacyRegion2Install (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
//
// Make sure the Legacy Region 2 Protocol is not already installed in the system
//
ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyRegion2ProtocolGuid);
//
// Install the protocol on a new handle.
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mLegacyRegion2Handle,
&gEfiLegacyRegion2ProtocolGuid, &mLegacyRegion2,
NULL
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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