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/** @file
Copyright (c) 2020 - 2021, Ampere Computing LLC. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Protocol/MmCommunication2.h>
#include "NVParamLibCommon.h"
STATIC EFI_MM_COMMUNICATION2_PROTOCOL *mMmCommunicationProtocol = NULL;
/**
This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE
event. It converts a pointer to a new virtual address.
@param Event Event whose notification function is being invoked.
@param Context Pointer to the notification function's context
**/
VOID
EFIAPI
NVParamLibAddressChangeEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
gRT->ConvertPointer (0x0, (VOID **)&mMmCommunicationProtocol);
}
/**
Constructor function of the RuntimeNVParamLib.
@param ImageHandle The image handle.
@param SystemTable The system table.
@retval EFI_SUCCESS Operation succeeded.
@retval Others An error has occurred
**/
EFI_STATUS
EFIAPI
NVParamLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_EVENT VirtualAddressChangeEvent = NULL;
EFI_STATUS Status;
Status = gBS->LocateProtocol (
&gEfiMmCommunication2ProtocolGuid,
NULL,
(VOID **)&mMmCommunicationProtocol
);
ASSERT_EFI_ERROR (Status);
Status = gBS->CreateEvent (
EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
TPL_CALLBACK,
NVParamLibAddressChangeEvent,
NULL,
&VirtualAddressChangeEvent
);
ASSERT_EFI_ERROR (Status);
return Status;
}
/**
Provides an interface to access the NVParam services via MM interface.
@param[in] Request Pointer to the request buffer
@param[in] RequestDataSize Size of the request buffer.
@param[out] Response Pointer to the response buffer
@param[in] ResponseDataSize Size of the response buffer.
@retval EFI_SUCCESS Operation succeeded.
@retval EFI_INVALID_PARAMETER An invalid data parameter or an invalid
combination of data parameters.
@retval Others An error has occurred.
**/
EFI_STATUS
NVParamMmCommunicate (
IN VOID *Request,
IN UINT32 RequestDataSize,
OUT VOID *Response,
IN UINT32 ResponseDataSize
)
{
EFI_MM_COMMUNICATE_REQUEST CommBuffer;
EFI_STATUS Status;
if ( (Request == NULL) || (RequestDataSize == 0)
|| (RequestDataSize > EFI_MM_MAX_PAYLOAD_SIZE)
|| ((ResponseDataSize == 0) && (Response == NULL)))
{
return EFI_INVALID_PARAMETER;
}
CopyGuid (&CommBuffer.HeaderGuid, &gNVParamMmGuid);
CommBuffer.MessageLength = RequestDataSize;
CopyMem (CommBuffer.Data, Request, RequestDataSize);
if (mMmCommunicationProtocol == NULL) {
return EFI_INVALID_PARAMETER;
}
Status = mMmCommunicationProtocol->Communicate (
mMmCommunicationProtocol,
&CommBuffer,
&CommBuffer,
NULL
);
if (EFI_ERROR (Status)) {
return Status;
}
if (ResponseDataSize > 0) {
CopyMem (Response, CommBuffer.Data, ResponseDataSize);
}
return EFI_SUCCESS;
}
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