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131 lines
5.0 KiB
C
131 lines
5.0 KiB
C
/** @file
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This file declares the SMM SMRAM Access abstraction protocol, which is used to control
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the visibility of the SMRAM on the platform. The expectation is
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that the north bridge or memory controller would publish this protocol.
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For example, the Memory Controller Hub (MCH) has the hardware provision for this
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type of control. Because of the protected, distinguished class of memory for IA-32
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systems, the expectation is that this protocol would be supported only on IA-32 systems.
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Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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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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@par Revision Reference:
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This Protocol is defined in Framework of EFI SMM Core Interface Spec
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Version 0.9.
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**/
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#ifndef _SMM_ACCESS_H_
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#define _SMM_ACCESS_H_
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#include <Guid/SmramMemoryReserve.h>
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typedef struct _EFI_SMM_ACCESS_PROTOCOL EFI_SMM_ACCESS_PROTOCOL;
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#define EFI_SMM_ACCESS_PROTOCOL_GUID \
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{ \
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0x3792095a, 0xe309, 0x4c1e, {0xaa, 0x01, 0x85, 0xf5, 0x65, 0x5a, 0x17, 0xf1 } \
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}
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//
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// SMM Access specification Member Function
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//
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/**
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Opens the SMRAM area to be accessible by a boot-service driver.
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@param This The EFI_SMM_ACCESS_PROTOCOL instance.
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@param DescriptorIndex Indicates that the driver wishes to open
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the memory tagged by this index.
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@retval EFI_SUCCESS The operation was successful.
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@retval EFI_INVALID_PARAMETER The given DescriptorIndex is not supported.
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@retval EFI_NOT_STARTED The SMM base service has not been initialized.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_OPEN)(
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IN EFI_SMM_ACCESS_PROTOCOL *This,
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UINTN DescriptorIndex
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);
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/**
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Inhibits access to the SMRAM.
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@param This The EFI_SMM_ACCESS_PROTOCOL instance.
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@param DescriptorIndex Indicates that the driver wishes to close
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the memory tagged by this index.
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@retval EFI_SUCCESS The operation was successful.
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@retval EFI_DEVICE_ERROR The given DescriptorIndex is not open.
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@retval EFI_INVALID_PARAMETER The given DescriptorIndex is not supported.
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@retval EFI_NOT_STARTED The SMM base service has not been initialized.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_CLOSE)(
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IN EFI_SMM_ACCESS_PROTOCOL *This,
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UINTN DescriptorIndex
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);
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/**
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Inhibits access to the SMRAM.
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@param This The EFI_SMM_ACCESS_PROTOCOL instance.
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@param DescriptorIndex Indicates that the driver wishes to lock
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the memory tagged by this index.
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@retval EFI_SUCCESS The operation was successful.
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@retval EFI_DEVICE_ERROR The given DescriptorIndex is not open.
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@retval EFI_INVALID_PARAMETER The given DescriptorIndex is not supported.
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@retval EFI_NOT_STARTED The SMM base service has not been initialized.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_LOCK)(
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IN EFI_SMM_ACCESS_PROTOCOL *This,
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UINTN DescriptorIndex
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);
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/**
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Queries the memory controller for the possible regions that will support SMRAM.
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@param This The EFI_SMM_ACCESS_PROTOCOL instance.
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@param SmramMapSize A pointer to the size, in bytes, of the SmramMemoryMap buffer.
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@param SmramMap A pointer to the buffer in which firmware places the current memory map.
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@retval EFI_SUCCESS The chipset supported the given resource.
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@retval EFI_BUFFER_TOO_SMALL The SmramMap parameter was too small.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_CAPABILITIES)(
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IN EFI_SMM_ACCESS_PROTOCOL *This,
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IN OUT UINTN *SmramMapSize,
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IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap
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);
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/**
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This protocol is used to control the visibility of the SMRAM on the platform.
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**/
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struct _EFI_SMM_ACCESS_PROTOCOL {
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EFI_SMM_OPEN Open; ///< Opens the SMRAM.
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EFI_SMM_CLOSE Close; ///< Closes the SMRAM.
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EFI_SMM_LOCK Lock; ///< Locks the SMRAM.
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EFI_SMM_CAPABILITIES GetCapabilities; ///< Gets information on possible SMRAM regions.
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BOOLEAN LockState; ///< Indicates the current state of the SMRAM. Set to TRUE if any region is locked.
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BOOLEAN OpenState; ///< Indicates the current state of the SMRAM. Set to TRUE if any region is open.
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};
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extern EFI_GUID gEfiSmmAccessProtocolGuid;
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#endif
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