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88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/** @file
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EFI MM Communication Protocol as defined in the PI 1.5 specification.
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This protocol provides a means of communicating between drivers outside of MM and MMI
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handlers inside of MM.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _MM_COMMUNICATION_H_
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#define _MM_COMMUNICATION_H_
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#pragma pack(1)
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///
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/// To avoid confusion in interpreting frames, the communication buffer should always
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/// begin with EFI_MM_COMMUNICATE_HEADER
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///
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typedef struct {
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///
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/// Allows for disambiguation of the message format.
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///
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EFI_GUID HeaderGuid;
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///
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/// Describes the size of Data (in bytes) and does not include the size of the header.
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///
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UINTN MessageLength;
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///
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/// Designates an array of bytes that is MessageLength in size.
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///
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UINT8 Data[1];
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} EFI_MM_COMMUNICATE_HEADER;
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#pragma pack()
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#define EFI_MM_COMMUNICATION_PROTOCOL_GUID \
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{ \
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0xc68ed8e2, 0x9dc6, 0x4cbd, { 0x9d, 0x94, 0xdb, 0x65, 0xac, 0xc5, 0xc3, 0x32 } \
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}
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typedef struct _EFI_MM_COMMUNICATION_PROTOCOL EFI_MM_COMMUNICATION_PROTOCOL;
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/**
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Communicates with a registered handler.
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This function provides a service to send and receive messages from a registered UEFI service.
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@param[in] This The EFI_MM_COMMUNICATION_PROTOCOL instance.
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@param[in] CommBuffer A pointer to the buffer to convey into MMRAM.
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@param[in] CommSize The size of the data buffer being passed in. On exit, the size of data
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being returned. Zero if the handler does not wish to reply with any data.
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This parameter is optional and may be NULL.
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@retval EFI_SUCCESS The message was successfully posted.
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@retval EFI_INVALID_PARAMETER The CommBuffer was NULL.
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@retval EFI_BAD_BUFFER_SIZE The buffer is too large for the MM implementation.
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If this error is returned, the MessageLength field
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in the CommBuffer header or the integer pointed by
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CommSize, are updated to reflect the maximum payload
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size the implementation can accommodate.
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@retval EFI_ACCESS_DENIED The CommunicateBuffer parameter or CommSize parameter,
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if not omitted, are in address range that cannot be
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accessed by the MM environment.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_COMMUNICATE)(
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IN CONST EFI_MM_COMMUNICATION_PROTOCOL *This,
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IN OUT VOID *CommBuffer,
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IN OUT UINTN *CommSize OPTIONAL
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);
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///
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/// EFI MM Communication Protocol provides runtime services for communicating
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/// between DXE drivers and a registered MMI handler.
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///
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struct _EFI_MM_COMMUNICATION_PROTOCOL {
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EFI_MM_COMMUNICATE Communicate;
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};
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extern EFI_GUID gEfiMmCommunicationProtocolGuid;
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#endif
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