mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-30 12:43:41 +01:00
128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/** @file
|
|
EFI MM Access Protocol as defined in the PI 1.5 specification.
|
|
|
|
This protocol is used to control the visibility of the MMRAM on the platform.
|
|
It abstracts the location and characteristics of MMRAM. The expectation is
|
|
that the north bridge or memory controller would publish this protocol.
|
|
|
|
The principal functionality found in the memory controller includes the following:
|
|
- Exposing the MMRAM to all non-MM agents, or the "open" state
|
|
- Shrouding the MMRAM to all but the MM agents, or the "closed" state
|
|
- Preserving the system integrity, or "locking" the MMRAM, such that the settings cannot be
|
|
perturbed by either boot service or runtime agents
|
|
|
|
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#ifndef _MM_ACCESS_H_
|
|
#define _MM_ACCESS_H_
|
|
|
|
#define EFI_MM_ACCESS_PROTOCOL_GUID \
|
|
{ \
|
|
0xc2702b74, 0x800c, 0x4131, {0x87, 0x46, 0x8f, 0xb5, 0xb8, 0x9c, 0xe4, 0xac } \
|
|
}
|
|
|
|
|
|
typedef struct _EFI_MM_ACCESS_PROTOCOL EFI_MM_ACCESS_PROTOCOL;
|
|
|
|
/**
|
|
Opens the MMRAM area to be accessible by a boot-service driver.
|
|
|
|
This function "opens" MMRAM so that it is visible while not inside of MM. The function should
|
|
return EFI_UNSUPPORTED if the hardware does not support hiding of MMRAM. The function
|
|
should return EFI_DEVICE_ERROR if the MMRAM configuration is locked.
|
|
|
|
@param[in] This The EFI_MM_ACCESS_PROTOCOL instance.
|
|
|
|
@retval EFI_SUCCESS The operation was successful.
|
|
@retval EFI_UNSUPPORTED The system does not support opening and closing of MMRAM.
|
|
@retval EFI_DEVICE_ERROR MMRAM cannot be opened, perhaps because it is locked.
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_MM_OPEN)(
|
|
IN EFI_MM_ACCESS_PROTOCOL *This
|
|
);
|
|
|
|
/**
|
|
Inhibits access to the MMRAM.
|
|
|
|
This function "closes" MMRAM so that it is not visible while outside of MM. The function should
|
|
return EFI_UNSUPPORTED if the hardware does not support hiding of MMRAM.
|
|
|
|
@param[in] This The EFI_MM_ACCESS_PROTOCOL instance.
|
|
|
|
@retval EFI_SUCCESS The operation was successful.
|
|
@retval EFI_UNSUPPORTED The system does not support opening and closing of MMRAM.
|
|
@retval EFI_DEVICE_ERROR MMRAM cannot be closed.
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_MM_CLOSE)(
|
|
IN EFI_MM_ACCESS_PROTOCOL *This
|
|
);
|
|
|
|
/**
|
|
Inhibits access to the MMRAM.
|
|
|
|
This function prohibits access to the MMRAM region. This function is usually implemented such
|
|
that it is a write-once operation.
|
|
|
|
@param[in] This The EFI_MM_ACCESS_PROTOCOL instance.
|
|
|
|
@retval EFI_SUCCESS The device was successfully locked.
|
|
@retval EFI_UNSUPPORTED The system does not support locking of MMRAM.
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_MM_LOCK)(
|
|
IN EFI_MM_ACCESS_PROTOCOL *This
|
|
);
|
|
|
|
/**
|
|
Queries the memory controller for the possible regions that will support MMRAM.
|
|
|
|
@param[in] This The EFI_MM_ACCESS_PROTOCOL instance.
|
|
@param[in,out] MmramMapSize A pointer to the size, in bytes, of the MmramMemoryMap buffer.
|
|
@param[in,out] MmramMap A pointer to the buffer in which firmware places the current memory map.
|
|
|
|
@retval EFI_SUCCESS The chipset supported the given resource.
|
|
@retval EFI_BUFFER_TOO_SMALL The MmramMap parameter was too small. The current buffer size
|
|
needed to hold the memory map is returned in MmramMapSize.
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_MM_CAPABILITIES)(
|
|
IN CONST EFI_MM_ACCESS_PROTOCOL *This,
|
|
IN OUT UINTN *MmramMapSize,
|
|
IN OUT EFI_MMRAM_DESCRIPTOR *MmramMap
|
|
);
|
|
|
|
///
|
|
/// EFI MM Access Protocol is used to control the visibility of the MMRAM on the platform.
|
|
/// It abstracts the location and characteristics of MMRAM. The platform should report all
|
|
/// MMRAM via EFI_MM_ACCESS_PROTOCOL. The expectation is that the north bridge or memory
|
|
/// controller would publish this protocol.
|
|
///
|
|
struct _EFI_MM_ACCESS_PROTOCOL {
|
|
EFI_MM_OPEN Open;
|
|
EFI_MM_CLOSE Close;
|
|
EFI_MM_LOCK Lock;
|
|
EFI_MM_CAPABILITIES GetCapabilities;
|
|
///
|
|
/// Indicates the current state of the MMRAM. Set to TRUE if MMRAM is locked.
|
|
///
|
|
BOOLEAN LockState;
|
|
///
|
|
/// Indicates the current state of the MMRAM. Set to TRUE if MMRAM is open.
|
|
///
|
|
BOOLEAN OpenState;
|
|
};
|
|
|
|
extern EFI_GUID gEfiMmAccessProtocolGuid;
|
|
|
|
#endif
|
|
|