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/** @file
Arm Ffa library code for Dxe Driver
Copyright (c) 2024, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Glossary:
- FF-A - Firmware Framework for Arm A-profile
@par Reference(s):
- Arm Firmware Framework for Arm A-Profile [https://developer.arm.com/documentation/den0077/latest]
**/
#include <Uefi.h>
#include <Pi/PiMultiPhase.h>
#include <Library/ArmLib.h>
#include <Library/ArmSmcLib.h>
#include <Library/ArmFfaLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <IndustryStandard/ArmFfaSvc.h>
#include <Guid/ArmFfaRxTxBufferInfo.h>
#include "ArmFfaCommon.h"
#include "ArmFfaRxTxMap.h"
STATIC EFI_EVENT mFfaExitBootServiceEvent;
/**
Unmap RX/TX buffer on Exit Boot Service.
@param [in] Event Registered exit boot service event.
@param [in] Context Additional data.
**/
STATIC
VOID
EFIAPI
ArmFfaLibExitBootServiceEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
ArmFfaLibRxTxUnmap ();
}
/**
ArmFfaLib Constructor.
@param [in] ImageHandle Image Handle
@param [in] SystemTable System Table
@retval EFI_SUCCESS Success
@retval EFI_INVALID_PARAMETER Invalid alignment of Rx/Tx buffer
@retval EFI_OUT_OF_RESOURCES Out of memory
@retval Others Error
**/
EFI_STATUS
EFIAPI
ArmFfaDxeLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_HOB_GUID_TYPE *RxTxBufferHob;
ARM_FFA_RX_TX_BUFFER_INFO *BufferInfo;
Status = ArmFfaLibCommonInit ();
if (EFI_ERROR (Status)) {
if (Status == EFI_UNSUPPORTED) {
/*
* EFI_UNSUPPORTED return from ArmFfaLibCommonInit() means
* FF-A interface doesn't support.
* However, It doesn't make failure of loading driver/library instance
* (i.e) ArmPkg's MmCommunication Dxe/PEI Driver uses as well as SpmMm.
* So If FF-A is not supported the the MmCommunication Dxe/PEI falls
* back to SpmMm.
* For this case, return EFI_SUCCESS.
*/
return EFI_SUCCESS;
}
return Status;
}
if (PcdGetBool (PcdFfaExitBootEventRegistered)) {
return EFI_SUCCESS;
}
RxTxBufferHob = GetFirstGuidHob (&gArmFfaRxTxBufferInfoGuid);
if (RxTxBufferHob != NULL) {
BufferInfo = GET_GUID_HOB_DATA (RxTxBufferHob);
if (!BufferInfo->RemapRequired) {
/*
* ArmFfaPeiLib handles the Rx/Tx buffer Remap and update the
* BufferInfo with permanant memory. So use it as it is.
*/
PcdSet64S (PcdFfaTxBuffer, (UINTN)BufferInfo->TxBufferAddr);
PcdSet64S (PcdFfaRxBuffer, (UINTN)BufferInfo->RxBufferAddr);
} else {
/*
* SEC maps Rx/Tx buffer, But no PEIM module doesn't use
* ArmFfaPeiLib. In this case, the BufferInfo includes
* temporary Rx/Tx buffer address.
*
* Therefore, remap Rx/Tx buffer with migrated address again.
*/
Status = RemapFfaRxTxBuffer (BufferInfo);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: Failed to remap Rx/Tx buffer... Status: %r\n", __func__, Status));
return Status;
}
BufferInfo->RemapRequired = FALSE;
}
} else {
Status = ArmFfaLibRxTxMap ();
/*
* When first Dxe instance (library or driver) which uses ArmFfaLib loaded,
* It already maps Rx/Tx buffer.
* From Next Dxe instance which uses ArmFfaLib it doesn't need to map Rx/Tx
* buffer again but it uses the mapped one.
* ArmFfaLibRxTxMap() returns EFI_ALREADY_STARTED when the Rx/Tx buffers
* already maps.
*/
if ((Status != EFI_SUCCESS) && (Status != EFI_ALREADY_STARTED)) {
DEBUG ((
DEBUG_ERROR,
"%a: Failed to Map Rx/Tx buffer. Status: %r\n",
__func__,
Status
));
return Status;
}
}
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
ArmFfaLibExitBootServiceEvent,
NULL,
&gEfiEventExitBootServicesGuid,
&mFfaExitBootServiceEvent
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: Failed to register ExitBootService event. Status: %r\n",
__func__,
Status
));
goto ErrorHandler;
}
PcdSetBoolS (PcdFfaExitBootEventRegistered, TRUE);
return EFI_SUCCESS;
ErrorHandler:
if (RxTxBufferHob != NULL) {
ArmFfaLibRxTxUnmap ();
}
return Status;
}
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