mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-29 12:35:53 +01:00
140 lines
5.3 KiB
C
140 lines
5.3 KiB
C
/** @file
|
|
EFI SMM Access PPI definition.
|
|
|
|
This PPI is used to control the visibility of the SMRAM on the platform.
|
|
It abstracts the location and characteristics of SMRAM. The expectation is
|
|
that the north bridge or memory controller would publish this PPI.
|
|
|
|
The principal functionality found in the memory controller includes the following:
|
|
- Exposing the SMRAM to all non-SMM agents, or the "open" state
|
|
- Shrouding the SMRAM to all but the SMM agents, or the "closed" state
|
|
- Preserving the system integrity, or "locking" the SMRAM, such that the settings cannot be
|
|
perturbed by either boot service or runtime agents
|
|
|
|
Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#ifndef _SMM_ACCESS_PPI_H_
|
|
#define _SMM_ACCESS_PPI_H_
|
|
|
|
#define PEI_SMM_ACCESS_PPI_GUID \
|
|
{ 0x268f33a9, 0xcccd, 0x48be, { 0x88, 0x17, 0x86, 0x5, 0x3a, 0xc3, 0x2e, 0xd6 }}
|
|
|
|
typedef struct _PEI_SMM_ACCESS_PPI PEI_SMM_ACCESS_PPI;
|
|
|
|
/**
|
|
Opens the SMRAM area to be accessible by a PEIM driver.
|
|
|
|
This function "opens" SMRAM so that it is visible while not inside of SMM. The function should
|
|
return EFI_UNSUPPORTED if the hardware does not support hiding of SMRAM. The function
|
|
should return EFI_DEVICE_ERROR if the SMRAM configuration is locked.
|
|
|
|
@param PeiServices General purpose services available to every PEIM.
|
|
@param This The pointer to the SMM Access Interface.
|
|
@param DescriptorIndex The region of SMRAM to Open.
|
|
|
|
@retval EFI_SUCCESS The region was successfully opened.
|
|
@retval EFI_DEVICE_ERROR The region could not be opened because locked by chipset.
|
|
@retval EFI_INVALID_PARAMETER The descriptor index was out of bounds.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *PEI_SMM_OPEN)(
|
|
IN EFI_PEI_SERVICES **PeiServices,
|
|
IN PEI_SMM_ACCESS_PPI *This,
|
|
IN UINTN DescriptorIndex
|
|
);
|
|
|
|
/**
|
|
Inhibits access to the SMRAM.
|
|
|
|
This function "closes" SMRAM so that it is not visible while outside of SMM. The function should
|
|
return EFI_UNSUPPORTED if the hardware does not support hiding of SMRAM.
|
|
|
|
@param PeiServices General purpose services available to every PEIM.
|
|
@param This The pointer to the SMM Access Interface.
|
|
@param DescriptorIndex The region of SMRAM to Close.
|
|
|
|
@retval EFI_SUCCESS The region was successfully closed.
|
|
@retval EFI_DEVICE_ERROR The region could not be closed because locked by chipset.
|
|
@retval EFI_INVALID_PARAMETER The descriptor index was out of bounds.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *PEI_SMM_CLOSE)(
|
|
IN EFI_PEI_SERVICES **PeiServices,
|
|
IN PEI_SMM_ACCESS_PPI *This,
|
|
IN UINTN DescriptorIndex
|
|
);
|
|
|
|
/**
|
|
Inhibits access to the SMRAM.
|
|
|
|
This function prohibits access to the SMRAM region. This function is usually implemented such
|
|
that it is a write-once operation.
|
|
|
|
@param PeiServices General purpose services available to every PEIM.
|
|
@param This The pointer to the SMM Access Interface.
|
|
@param DescriptorIndex The region of SMRAM to Close.
|
|
|
|
@retval EFI_SUCCESS The region was successfully locked.
|
|
@retval EFI_DEVICE_ERROR The region could not be locked because at least
|
|
one range is still open.
|
|
@retval EFI_INVALID_PARAMETER The descriptor index was out of bounds.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *PEI_SMM_LOCK)(
|
|
IN EFI_PEI_SERVICES **PeiServices,
|
|
IN PEI_SMM_ACCESS_PPI *This,
|
|
IN UINTN DescriptorIndex
|
|
);
|
|
|
|
/**
|
|
Queries the memory controller for the possible regions that will support SMRAM.
|
|
|
|
@param PeiServices General purpose services available to every PEIM.
|
|
@param This The pointer to the SmmAccessPpi Interface.
|
|
@param SmramMapSize The pointer to the variable containing size of the
|
|
buffer to contain the description information.
|
|
@param SmramMap The buffer containing the data describing the Smram
|
|
region descriptors.
|
|
|
|
@retval EFI_BUFFER_TOO_SMALL The user did not provide a sufficient buffer.
|
|
@retval EFI_SUCCESS The user provided a sufficiently-sized buffer.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *PEI_SMM_CAPABILITIES)(
|
|
IN EFI_PEI_SERVICES **PeiServices,
|
|
IN PEI_SMM_ACCESS_PPI *This,
|
|
IN OUT UINTN *SmramMapSize,
|
|
IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap
|
|
);
|
|
|
|
///
|
|
/// EFI SMM Access PPI is used to control the visibility of the SMRAM on the platform.
|
|
/// It abstracts the location and characteristics of SMRAM. The platform should report
|
|
/// all MMRAM via PEI_SMM_ACCESS_PPI. The expectation is that the north bridge or
|
|
/// memory controller would publish this PPI.
|
|
///
|
|
struct _PEI_SMM_ACCESS_PPI {
|
|
PEI_SMM_OPEN Open;
|
|
PEI_SMM_CLOSE Close;
|
|
PEI_SMM_LOCK Lock;
|
|
PEI_SMM_CAPABILITIES GetCapabilities;
|
|
BOOLEAN LockState;
|
|
BOOLEAN OpenState;
|
|
};
|
|
|
|
extern EFI_GUID gPeiSmmAccessPpiGuid;
|
|
|
|
#endif
|