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/** @file
EFI MM Communication Protocol 2 as defined in the PI 1.7 errata A specification.
This protocol provides a means of communicating between drivers outside of MM and MMI
handlers inside of MM.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2019, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _MM_COMMUNICATION2_H_
#define _MM_COMMUNICATION2_H_
#include <Protocol/MmCommunication.h>
#define EFI_MM_COMMUNICATION2_PROTOCOL_GUID \
{ \
0x378daedc, 0xf06b, 0x4446, { 0x83, 0x14, 0x40, 0xab, 0x93, 0x3c, 0x87, 0xa3 } \
}
typedef struct _EFI_MM_COMMUNICATION2_PROTOCOL EFI_MM_COMMUNICATION2_PROTOCOL;
/**
Communicates with a registered handler.
This function provides a service to send and receive messages from a registered UEFI service.
@param[in] This The EFI_MM_COMMUNICATION_PROTOCOL instance.
@param[in, out] CommBufferPhysical Physical address of the MM communication buffer
@param[in, out] CommBufferVirtual Virtual address of the MM communication buffer
@param[in, out] CommSize The size of the data buffer being passed in. On exit, the
size of data being returned. Zero if the handler does not
wish to reply with any data. This parameter is optional
and may be NULL.
@retval EFI_SUCCESS The message was successfully posted.
@retval EFI_INVALID_PARAMETER CommBufferPhysical was NULL or CommBufferVirtual was NULL.
@retval EFI_BAD_BUFFER_SIZE The buffer is too large for the MM implementation.
If this error is returned, the MessageLength field
in the CommBuffer header or the integer pointed by
CommSize, are updated to reflect the maximum payload
size the implementation can accommodate.
@retval EFI_ACCESS_DENIED The CommunicateBuffer parameter or CommSize parameter,
if not omitted, are in address range that cannot be
accessed by the MM environment.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_MM_COMMUNICATE2)(
IN CONST EFI_MM_COMMUNICATION2_PROTOCOL *This,
IN OUT VOID *CommBufferPhysical,
IN OUT VOID *CommBufferVirtual,
IN OUT UINTN *CommSize OPTIONAL
);
///
/// EFI MM Communication Protocol provides runtime services for communicating
/// between DXE drivers and a registered MMI handler.
///
struct _EFI_MM_COMMUNICATION2_PROTOCOL {
EFI_MM_COMMUNICATE2 Communicate;
};
extern EFI_GUID gEfiMmCommunication2ProtocolGuid;
#endif
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