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144 lines
5.3 KiB
C
144 lines
5.3 KiB
C
/** @file
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EFI SMM Access2 Protocol as defined in the PI 1.2 specification.
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This protocol is used to control the visibility of the SMRAM on the platform.
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It abstracts the location and characteristics of SMRAM. The expectation is
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that the north bridge or memory controller would publish this protocol.
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The principal functionality found in the memory controller includes the following:
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- Exposing the SMRAM to all non-SMM agents, or the "open" state
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- Shrouding the SMRAM to all but the SMM agents, or the "closed" state
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- Preserving the system integrity, or "locking" the SMRAM, such that the settings cannot be
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perturbed by either boot service or runtime agents
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Copyright (c) 2009 - 2010, Intel Corporation
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All rights reserved. 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_ACCESS2_H_
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#define _SMM_ACCESS2_H_
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///
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/// Note:
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/// To avoid name conflict between PI and Framework SMM spec, the following names defined
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/// in PI 1.2 SMM spec are renamed. These renamings are not yet in a public PI spec and errta.
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///
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/// EFI_SMM_OPEN -> EFI_SMM_OPEN2
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/// EFI_SMM_CLOSE -> EFI_SMM_CLOSE2
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/// EFI_SMM_LOCK -> EFI_SMM_LOCK2
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/// EFI_SMM_CAPABILITIES -> EFI_SMM_CAPABILITIES2
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///
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#define EFI_SMM_ACCESS2_PROTOCOL_GUID \
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{ \
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0xc2702b74, 0x800c, 0x4131, {0x87, 0x46, 0x8f, 0xb5, 0xb8, 0x9c, 0xe4, 0xac } \
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}
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typedef struct _EFI_SMM_ACCESS2_PROTOCOL EFI_SMM_ACCESS2_PROTOCOL;
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/**
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Opens the SMRAM area to be accessible by a boot-service driver.
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This function "opens" SMRAM so that it is visible while not inside of SMM. The function should
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return EFI_UNSUPPORTED if the hardware does not support hiding of SMRAM. The function
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should return EFI_DEVICE_ERROR if the SMRAM configuration is locked.
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@param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
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@retval EFI_SUCCESS The operation was successful.
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@retval EFI_UNSUPPORTED The system does not support opening and closing of SMRAM.
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@retval EFI_DEVICE_ERROR SMRAM cannot be opened, perhaps because it is locked.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_OPEN2)(
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IN EFI_SMM_ACCESS2_PROTOCOL *This
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);
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/**
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Inhibits access to the SMRAM.
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This function "closes" SMRAM so that it is not visible while outside of SMM. The function should
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return EFI_UNSUPPORTED if the hardware does not support hiding of SMRAM.
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@param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
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@retval EFI_SUCCESS The operation was successful.
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@retval EFI_UNSUPPORTED The system does not support opening and closing of SMRAM.
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@retval EFI_DEVICE_ERROR SMRAM cannot be closed.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_CLOSE2)(
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IN EFI_SMM_ACCESS2_PROTOCOL *This
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);
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/**
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Inhibits access to the SMRAM.
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This function prohibits access to the SMRAM region. This function is usually implemented such
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that it is a write-once operation.
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@param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
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@retval EFI_SUCCESS The device was successfully locked.
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@retval EFI_UNSUPPORTED The system does not support locking of SMRAM.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_LOCK2)(
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IN EFI_SMM_ACCESS2_PROTOCOL *This
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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[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
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@param[in,out] SmramMapSize A pointer to the size, in bytes, of the SmramMemoryMap buffer.
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@param[in,out] 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. The current buffer size
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needed to hold the memory map is returned in SmramMapSize.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_CAPABILITIES2)(
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IN CONST EFI_SMM_ACCESS2_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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/// EFI SMM Access2 Protocol is used to control the visibility of the SMRAM on the platform.
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/// It abstracts the location and characteristics of SMRAM. The expectation is
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/// that the north bridge or memory controller would publish this protocol.
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///
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struct _EFI_SMM_ACCESS2_PROTOCOL {
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EFI_SMM_OPEN2 Open;
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EFI_SMM_CLOSE2 Close;
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EFI_SMM_LOCK2 Lock;
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EFI_SMM_CAPABILITIES2 GetCapabilities;
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///
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/// Indicates the current state of the SMRAM. Set to TRUE if SMRAM is locked.
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///
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BOOLEAN LockState;
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///
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/// Indicates the current state of the SMRAM. Set to TRUE if SMRAM is open.
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///
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BOOLEAN OpenState;
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};
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extern EFI_GUID gEfiSmmAccess2ProtocolGuid;
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#endif
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