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/** @file
Arm Ffa library code for PeilessSec
Copyright (c) 2025, 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 <IndustryStandard/ArmFfaSvc.h>
#include <Guid/ArmFfaRxTxBufferInfo.h>
#include "ArmFfaCommon.h"
#include "ArmFfaRxTxMap.h"
/**
ArmFfaLib Constructor.
@param [in] FileHandle File Handle
@param [in] PeiServices Pei Service Table
@retval EFI_SUCCESS Success
@retval Others Error
**/
EFI_STATUS
EFIAPI
ArmFfaSecLibConstructor (
IN VOID
)
{
EFI_STATUS Status;
ARM_FFA_RX_TX_BUFFER_INFO *BufferInfo;
EFI_HOB_MEMORY_ALLOCATION *RxTxBufferAllocationHob;
UINTN Property1;
UINTN Property2;
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;
}
Status = ArmFfaLibRxTxMap ();
if (EFI_ERROR (Status)) {
if (Status != EFI_UNSUPPORTED) {
return Status;
}
/*
* When ARM_FID_FFA_PARTITION_INFO_GET_REGS is supported,
* Rx/Tx buffer might not be required to request service to
* secure partition.
* So, consider EFI_UNSUPPORTED for Rx/Tx buffer as SUCCESS.
*/
Status = ArmFfaLibGetFeatures (
ARM_FID_FFA_PARTITION_INFO_GET_REGS,
0x00,
&Property1,
&Property2
);
if (!EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO, "%a Rx/Tx buffer doesn't support.\n", __func__));
}
return Status;
}
BufferInfo = BuildGuidHob (
&gArmFfaRxTxBufferInfoGuid,
sizeof (ARM_FFA_RX_TX_BUFFER_INFO)
);
if (BufferInfo == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Failed to create Rx/Tx Buffer Info Hob\n", __func__));
ArmFfaLibRxTxUnmap ();
return EFI_OUT_OF_RESOURCES;
}
RxTxBufferAllocationHob = FindRxTxBufferAllocationHob (FALSE);
ASSERT (RxTxBufferAllocationHob != NULL);
/*
* Set then Name with gArmFfaRxTxBufferInfoGuid, so that ArmFfaPeiLib or
* ArmFfaDxeLib can find the Rx/Tx buffer allocation area.
*/
CopyGuid (
&RxTxBufferAllocationHob->AllocDescriptor.Name,
&gArmFfaRxTxBufferInfoGuid
);
UpdateRxTxBufferInfo (BufferInfo);
BufferInfo->RemapOffset =
(UINTN)(BufferInfo->TxBufferAddr -
RxTxBufferAllocationHob->AllocDescriptor.MemoryBaseAddress);
BufferInfo->RemapRequired = TRUE;
return EFI_SUCCESS;
}
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