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79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/** @file
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EFI SMM Configuration Protocol as defined in the PI 1.2 specification.
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This protocol is used to:
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1) report the portions of SMRAM regions which cannot be used for the SMRAM heap.
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2) register the SMM Foundation entry point with the processor code. The entry
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point will be invoked by the SMM processor entry code.
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Copyright (c) 2009 - 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 _SMM_CONFIGURATION_H_
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#define _SMM_CONFIGURATION_H_
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#include <Protocol/MmConfiguration.h>
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#include <Pi/PiSmmCis.h>
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#define EFI_SMM_CONFIGURATION_PROTOCOL_GUID EFI_MM_CONFIGURATION_PROTOCOL_GUID
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///
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/// Structure describing a SMRAM region which cannot be used for the SMRAM heap.
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///
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typedef struct _EFI_SMM_RESERVED_SMRAM_REGION {
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///
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/// Starting address of the reserved SMRAM area, as it appears while SMRAM is open.
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/// Ignored if SmramReservedSize is 0.
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///
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EFI_PHYSICAL_ADDRESS SmramReservedStart;
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///
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/// Number of bytes occupied by the reserved SMRAM area. A size of zero indicates the
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/// last SMRAM area.
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///
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UINT64 SmramReservedSize;
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} EFI_SMM_RESERVED_SMRAM_REGION;
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typedef struct _EFI_SMM_CONFIGURATION_PROTOCOL EFI_SMM_CONFIGURATION_PROTOCOL;
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/**
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Register the SMM Foundation entry point.
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This function registers the SMM Foundation entry point with the processor code. This entry point
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will be invoked by the SMM Processor entry code.
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@param[in] This The EFI_SMM_CONFIGURATION_PROTOCOL instance.
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@param[in] SmmEntryPoint SMM Foundation entry point.
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@retval EFI_SUCCESS Success to register SMM Entry Point.
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@retval EFI_INVALID_PARAMETER SmmEntryPoint is NULL.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_REGISTER_SMM_ENTRY)(
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IN CONST EFI_SMM_CONFIGURATION_PROTOCOL *This,
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IN EFI_SMM_ENTRY_POINT SmmEntryPoint
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);
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///
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/// The EFI SMM Configuration Protocol is a mandatory protocol published by a DXE CPU driver to
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/// indicate which areas within SMRAM are reserved for use by the CPU for any purpose,
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/// such as stack, save state or SMM entry point.
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///
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/// The RegisterSmmEntry() function allows the SMM IPL DXE driver to register the SMM
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/// Foundation entry point with the SMM entry vector code.
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///
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struct _EFI_SMM_CONFIGURATION_PROTOCOL {
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///
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/// A pointer to an array SMRAM ranges used by the initial SMM entry code.
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///
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EFI_SMM_RESERVED_SMRAM_REGION *SmramReservedRegions;
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EFI_SMM_REGISTER_SMM_ENTRY RegisterSmmEntry;
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};
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extern EFI_GUID gEfiSmmConfigurationProtocolGuid;
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#endif
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