Data Structures
struct	EFI_MM_COMMUNICATE_HEADER

struct	_EFI_MM_COMMUNICATION_PROTOCOL

Macros
#define	EFI_MM_COMMUNICATION_PROTOCOL_GUID

Typedefs
typedef struct _EFI_MM_COMMUNICATION_PROTOCOL	EFI_MM_COMMUNICATION_PROTOCOL

typedef EFI_STATUS(EFIAPI *	EFI_MM_COMMUNICATE )(IN CONST EFI_MM_COMMUNICATION_PROTOCOL This, IN OUT VOID CommBuffer, IN OUT UINTN *CommSize)

Variables
EFI_GUID	gEfiMmCommunicationProtocolGuid

Detailed Description

EFI MM Communication Protocol as defined in the PI 1.5 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.
SPDX-License-Identifier: BSD-2-Clause-Patent

Macro Definition Documentation

#define EFI_MM_COMMUNICATION_PROTOCOL_GUID

Value:

{ \
    0xc68ed8e2, 0x9dc6, 0x4cbd, { 0x9d, 0x94, 0xdb, 0x65, 0xac, 0xc5, 0xc3, 0x32 } \
  }

Communicates with a registered handler.

This function provides a service to send and receive messages from a registered UEFI service.

Parameters

[in]	This	The EFI_MM_COMMUNICATION_PROTOCOL instance.
[in]	CommBuffer	A pointer to the buffer to convey into MMRAM.
[in]	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.

Return values

EFI_SUCCESS	The message was successfully posted.
EFI_INVALID_PARAMETER	The CommBuffer was NULL.
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.
EFI_ACCESS_DENIED	The CommunicateBuffer parameter or CommSize parameter, if not omitted, are in address range that cannot be accessed by the MM environment.

EFI_GUID gEfiMmCommunicationProtocolGuid