b26f0cf9ee
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/**@file
|
|
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.
|
|
|
|
Copyright (C) 2018, Red Hat, Inc.
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
|
|
#include <Library/CacheMaintenanceLib.h>
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/PeiServicesLib.h>
|
|
#include <Ppi/MpServices.h>
|
|
|
|
#include "Platform.h"
|
|
|
|
/**
|
|
Invalidate data & instruction caches.
|
|
All APs execute this function in parallel. The BSP executes the function
|
|
separately.
|
|
|
|
@param[in,out] WorkSpace Pointer to the input/output argument workspace
|
|
shared by all processors.
|
|
**/
|
|
STATIC
|
|
VOID
|
|
EFIAPI
|
|
ClearCache (
|
|
IN OUT VOID *WorkSpace
|
|
)
|
|
{
|
|
WriteBackInvalidateDataCache ();
|
|
InvalidateInstructionCache ();
|
|
}
|
|
|
|
/**
|
|
Notification function called when EFI_PEI_MP_SERVICES_PPI becomes available.
|
|
|
|
@param[in] PeiServices Indirect reference to the PEI Services Table.
|
|
@param[in] NotifyDescriptor Address of the notification descriptor data
|
|
structure.
|
|
@param[in] Ppi Address of the PPI that was installed.
|
|
|
|
@return Status of the notification. The status code returned from this
|
|
function is ignored.
|
|
**/
|
|
STATIC
|
|
EFI_STATUS
|
|
EFIAPI
|
|
ClearCacheOnMpServicesAvailable (
|
|
IN EFI_PEI_SERVICES **PeiServices,
|
|
IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,
|
|
IN VOID *Ppi
|
|
)
|
|
{
|
|
EFI_PEI_MP_SERVICES_PPI *MpServices;
|
|
EFI_STATUS Status;
|
|
|
|
DEBUG ((DEBUG_INFO, "%a: %a\n", gEfiCallerBaseName, __FUNCTION__));
|
|
|
|
//
|
|
// Clear cache on all the APs in parallel.
|
|
//
|
|
MpServices = Ppi;
|
|
Status = MpServices->StartupAllAPs (
|
|
(CONST EFI_PEI_SERVICES **)PeiServices,
|
|
MpServices,
|
|
ClearCache, // Procedure
|
|
FALSE, // SingleThread
|
|
0, // TimeoutInMicroSeconds: inf.
|
|
NULL // ProcedureArgument
|
|
);
|
|
if (EFI_ERROR (Status) && Status != EFI_NOT_STARTED) {
|
|
DEBUG ((DEBUG_ERROR, "%a: StartupAllAps(): %r\n", __FUNCTION__, Status));
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Now clear cache on the BSP too.
|
|
//
|
|
ClearCache (NULL);
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// Notification object for registering the callback, for when
|
|
// EFI_PEI_MP_SERVICES_PPI becomes available.
|
|
//
|
|
STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR mMpServicesNotify = {
|
|
EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | // Flags
|
|
EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
|
|
&gEfiPeiMpServicesPpiGuid, // Guid
|
|
ClearCacheOnMpServicesAvailable // Notify
|
|
};
|
|
|
|
VOID
|
|
InstallClearCacheCallback (
|
|
VOID
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
|
|
Status = PeiServicesNotifyPpi (&mMpServicesNotify);
|
|
if (EFI_ERROR (Status)) {
|
|
DEBUG ((DEBUG_ERROR, "%a: failed to set up MP Services callback: %r\n",
|
|
__FUNCTION__, Status));
|
|
}
|
|
}
|