9df063a06a
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10403 6f19259b-4bc3-4df7-8a09-765794883524
80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
/** @file
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EFI SMM Communication Protocol as defined in the PI 1.2 specification.
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This protocol provides a means of communicating between drivers outside of SMM and SMI
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handlers inside of SMM.
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Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef _SMM_COMMUNICATION_H_
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#define _SMM_COMMUNICATION_H_
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#define EFI_SMM_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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///
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/// To avoid confusion in interpreting frames, the communication buffer should always
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/// begin with EFI_SMM_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_SMM_COMMUNICATE_HEADER;
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typedef struct _EFI_SMM_COMMUNICATION_PROTOCOL EFI_SMM_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_SMM_COMMUNICATION_PROTOCOL instance.
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@param[in] CommBuffer A pointer to the buffer to convey into SMRAM.
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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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@retval EFI_SUCCESS The message was successfully posted.
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@retval EFI_INVALID_PARAMETER The CommBuffer was NULL.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_COMMUNICATE2)(
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IN CONST EFI_SMM_COMMUNICATION_PROTOCOL *This,
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IN OUT VOID *CommBuffer,
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IN OUT UINTN *CommSize
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);
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///
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/// EFI SMM Communication Protocol provides runtime services for communicating
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/// between DXE drivers and a registered SMI handler.
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///
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struct _EFI_SMM_COMMUNICATION_PROTOCOL {
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EFI_SMM_COMMUNICATE2 Communicate;
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};
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extern EFI_GUID gEfiSmmCommunicationProtocolGuid;
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#endif
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