mirror of https://github.com/acidanthera/audk.git
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/** @file
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MM Communication buffer data.
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Copyright (c) 2024, 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_COMM_BUFFER_H_
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#define MM_COMM_BUFFER_H_
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///
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/// The GUID of the MM Communication buffer HOB.
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///
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#define MM_COMM_BUFFER_HOB_GUID \
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{ 0x6c2a2520, 0x0131, 0x4aee, { 0xa7, 0x50, 0xcc, 0x38, 0x4a, 0xac, 0xe8, 0xc6 }}
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///
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/// The MM communicate buffer facilitates data sharing between non-MM and MM code.
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/// The MM IPL code allocates a "fixed" runtime type memory as the MM communication buffer,
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/// and communicates its address and size to MM Core via MmCommBuffer GUIDed HOB.
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/// Here, "fixed" implies that the buffer's location remains constant throughout the boot process.
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/// Data is exchanged between the MM Communication PPI/Protocol and a software MMI handler
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/// using this fixed MM communication buffer.
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///
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typedef struct {
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///
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/// The address of the 4-KiB aligned fixed MM communication buffer.
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///
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EFI_PHYSICAL_ADDRESS PhysicalStart;
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///
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/// Size of the fixed MM communication buffer, in 4KiB pages.
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///
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UINT64 NumberOfPages;
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///
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/// Point to MM_COMM_BUFFER_STATUS structure.
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///
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EFI_PHYSICAL_ADDRESS Status;
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} MM_COMM_BUFFER;
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typedef struct {
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///
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/// Whether the data in the fixed MM communication buffer is valid when entering from non-MM to MM.
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///
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BOOLEAN IsCommBufferValid;
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///
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/// The return status when returning from MM to non-MM.
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///
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UINT64 ReturnStatus;
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///
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/// The size in bytes of the output buffer when returning from MM to non-MM.
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///
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UINT64 ReturnBufferSize;
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} MM_COMM_BUFFER_STATUS;
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extern EFI_GUID gMmCommBufferHobGuid;
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#endif
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