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128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/** @file
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EFI MM Access Protocol as defined in the PI 1.5 specification.
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This protocol is used to control the visibility of the MMRAM on the platform.
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It abstracts the location and characteristics of MMRAM. 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 MMRAM to all non-MM agents, or the "open" state
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- Shrouding the MMRAM to all but the MM agents, or the "closed" state
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- Preserving the system integrity, or "locking" the MMRAM, such that the settings cannot be
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perturbed by either boot service or runtime agents
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Copyright (c) 2017, 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_ACCESS_H_
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#define _MM_ACCESS_H_
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#define EFI_MM_ACCESS_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_MM_ACCESS_PROTOCOL EFI_MM_ACCESS_PROTOCOL;
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/**
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Opens the MMRAM area to be accessible by a boot-service driver.
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This function "opens" MMRAM so that it is visible while not inside of MM. The function should
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return EFI_UNSUPPORTED if the hardware does not support hiding of MMRAM. The function
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should return EFI_DEVICE_ERROR if the MMRAM configuration is locked.
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@param[in] This The EFI_MM_ACCESS_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 MMRAM.
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@retval EFI_DEVICE_ERROR MMRAM 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_MM_OPEN)(
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IN EFI_MM_ACCESS_PROTOCOL *This
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);
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/**
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Inhibits access to the MMRAM.
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This function "closes" MMRAM so that it is not visible while outside of MM. The function should
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return EFI_UNSUPPORTED if the hardware does not support hiding of MMRAM.
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@param[in] This The EFI_MM_ACCESS_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 MMRAM.
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@retval EFI_DEVICE_ERROR MMRAM cannot be closed.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_CLOSE)(
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IN EFI_MM_ACCESS_PROTOCOL *This
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);
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/**
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Inhibits access to the MMRAM.
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This function prohibits access to the MMRAM 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_MM_ACCESS_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 MMRAM.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_LOCK)(
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IN EFI_MM_ACCESS_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 MMRAM.
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@param[in] This The EFI_MM_ACCESS_PROTOCOL instance.
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@param[in,out] MmramMapSize A pointer to the size, in bytes, of the MmramMemoryMap buffer.
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@param[in,out] MmramMap 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 MmramMap parameter was too small. The current buffer size
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needed to hold the memory map is returned in MmramMapSize.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_CAPABILITIES)(
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IN CONST EFI_MM_ACCESS_PROTOCOL *This,
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IN OUT UINTN *MmramMapSize,
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IN OUT EFI_MMRAM_DESCRIPTOR *MmramMap
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);
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///
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/// EFI MM Access Protocol is used to control the visibility of the MMRAM on the platform.
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/// It abstracts the location and characteristics of MMRAM. The platform should report all
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/// MMRAM via EFI_MM_ACCESS_PROTOCOL. The expectation is that the north bridge or memory
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/// controller would publish this protocol.
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///
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struct _EFI_MM_ACCESS_PROTOCOL {
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EFI_MM_OPEN Open;
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EFI_MM_CLOSE Close;
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EFI_MM_LOCK Lock;
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EFI_MM_CAPABILITIES GetCapabilities;
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///
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/// Indicates the current state of the MMRAM. Set to TRUE if MMRAM 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 MMRAM. Set to TRUE if MMRAM is open.
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///
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BOOLEAN OpenState;
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};
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extern EFI_GUID gEfiMmAccessProtocolGuid;
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#endif
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