#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.h>
#include <Ppi/MpServices.h>
#include "Platform.h"

Functions
STATIC VOID EFIAPI	ClearCache (IN OUT VOID *WorkSpace)

STATIC EFI_STATUS EFIAPI	ClearCacheOnMpServicesAvailable (IN EFI_PEI_SERVICES *PeiServices, IN EFI_PEI_NOTIFY_DESCRIPTOR NotifyDescriptor, IN VOID *Ppi)

VOID	InstallClearCacheCallback (VOID)

Variables
STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR	mMpServicesNotify

Detailed Description

Install a callback to clear cache on all processors. This is for conformance with the TCG "Platform Reset Attack Mitigation Specification". Because clearing the CPU caches at boot doesn't impact performance significantly, do it unconditionally, for simplicity's sake.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file ClearCache.c.

Function Documentation

◆ ClearCache()

STATIC VOID EFIAPI ClearCache ( IN OUT VOID * WorkSpace )

Invalidate data & instruction caches. All APs execute this function in parallel. The BSP executes the function separately.

Parameters

[in,out] WorkSpace Pointer to the input/output argument workspace shared by all processors.

Definition at line 32 of file ClearCache.c.

◆ ClearCacheOnMpServicesAvailable()

STATIC EFI_STATUS EFIAPI ClearCacheOnMpServicesAvailable	(	IN EFI_PEI_SERVICES **	PeiServices,
		IN EFI_PEI_NOTIFY_DESCRIPTOR *	NotifyDescriptor,
		IN VOID *	Ppi
	)

Notification function called when EFI_PEI_MP_SERVICES_PPI becomes available.

Parameters

[in]	PeiServices	Indirect reference to the PEI Services Table.
[in]	NotifyDescriptor	Address of the notification descriptor data structure.
[in]	Ppi	Address of the PPI that was installed.

Returns: Status of the notification. The status code returned from this function is ignored.

Definition at line 54 of file ClearCache.c.

◆ InstallClearCacheCallback()

VOID InstallClearCacheCallback ( VOID )

Definition at line 101 of file ClearCache.c.

Variable Documentation

◆ mMpServicesNotify

STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR mMpServicesNotify

Initial value:

= {
  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | 
  EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
  &gEfiPeiMpServicesPpiGuid,               
  ClearCacheOnMpServicesAvailable          
}

Definition at line 93 of file ClearCache.c.

Functions