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58 lines
2.4 KiB
C
58 lines
2.4 KiB
C
/** @file
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Copyright (c) 2015 - 2018, 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 _PI_SMM_COMMUNICATION_REGION_TABLE_H_
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#define _PI_SMM_COMMUNICATION_REGION_TABLE_H_
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#define EDKII_PI_SMM_COMMUNICATION_REGION_TABLE_GUID {\
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0x4e28ca50, 0xd582, 0x44ac, {0xa1, 0x1f, 0xe3, 0xd5, 0x65, 0x26, 0xdb, 0x34} \
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}
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//
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// This table to declare the generic SMM communication buffer location.
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// If this table is present, it means the SMM communication buffer is restricted to
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// EfiReservedMemoryType, EfiACPIMemoryNVS, or EfiRuntimeServicesData.
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//
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// This table is installed to UEFI configuration table by generic driver
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// or platform driver, at early DXE phase.
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//
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// The EFI_MEMORY_DESCRIPTOR entry must contain at least one entry.
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// The entries must be normal memory region in EfiReservedMemoryType, EfiACPIMemoryNVS,
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// or EfiRuntimeServicesData.
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// If the Entry.Type is EfiConventionalMemory, it means this entry is free to use.
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// If the Entry.Type is other, it means this entry is occupied.
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//
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// Any non-SMM component may put communication data there, then use
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// UEFI defined SMM Communication ACPI Table, or PI defined EFI_SMM_COMMUNICATION_PROTOCOL
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// to communicate with SMI handler. The process is:
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// 1) Find an entry whose type is EfiConventional.
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// 2) Change type to be EfiReservedMemoryType before use.
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// 3) Use it.
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// 4) Restore type be EfiConventional.
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// The step 2) must be performed as an atomic transaction, if there might be conflict during runtime.
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// For example, on IA-32/x64 platforms, this can be done using the CMPXCHG CPU instruction.
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// If there is guarantee on no conflict during boot time, these steps can be skipped.
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// For example, DXE, UEFI driver and UEFI application runs in sequence.
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//
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// For example, FPDT driver can use this communication buffer to get SMM
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// performance data in SMM. Profile driver can use this communication buffer
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// to get SMM profile data in SMM.
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//
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typedef struct {
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UINT32 Version;
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UINT32 NumberOfEntries;
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UINT32 DescriptorSize;
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UINT32 Reserved;
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//EFI_MEMORY_DESCRIPTOR Entry[1];
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} EDKII_PI_SMM_COMMUNICATION_REGION_TABLE;
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#define EDKII_PI_SMM_COMMUNICATION_REGION_TABLE_VERSION 0x00000001
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extern EFI_GUID gEdkiiPiSmmCommunicationRegionTableGuid;
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#endif
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