mirror of https://github.com/acidanthera/audk.git
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/**@file
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Install a callback to clear cache on all processors.
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This is for conformance with the TCG "Platform Reset Attack Mitigation
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Specification". Because clearing the CPU caches at boot doesn't impact
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performance significantly, do it unconditionally, for simplicity's
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sake.
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Copyright (C) 2018, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/CacheMaintenanceLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PeiServicesLib.h>
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#include <Ppi/MpServices.h>
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#include "Platform.h"
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/**
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Invalidate data & instruction caches.
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All APs execute this function in parallel. The BSP executes the function
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separately.
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@param[in,out] WorkSpace Pointer to the input/output argument workspace
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shared by all processors.
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**/
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STATIC
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VOID
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EFIAPI
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ClearCache (
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IN OUT VOID *WorkSpace
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)
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{
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WriteBackInvalidateDataCache ();
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InvalidateInstructionCache ();
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}
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/**
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Notification function called when EFI_PEI_MP_SERVICES_PPI becomes available.
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@param[in] PeiServices Indirect reference to the PEI Services Table.
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@param[in] NotifyDescriptor Address of the notification descriptor data
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structure.
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@param[in] Ppi Address of the PPI that was installed.
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@return Status of the notification. The status code returned from this
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function is ignored.
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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ClearCacheOnMpServicesAvailable (
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,
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IN VOID *Ppi
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)
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{
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EFI_PEI_MP_SERVICES_PPI *MpServices;
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EFI_STATUS Status;
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DEBUG ((DEBUG_INFO, "%a: %a\n", gEfiCallerBaseName, __FUNCTION__));
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//
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// Clear cache on all the APs in parallel.
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//
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MpServices = Ppi;
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Status = MpServices->StartupAllAPs (
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(CONST EFI_PEI_SERVICES **)PeiServices,
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MpServices,
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ClearCache, // Procedure
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FALSE, // SingleThread
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0, // TimeoutInMicroSeconds: inf.
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NULL // ProcedureArgument
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);
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if (EFI_ERROR (Status) && Status != EFI_NOT_STARTED) {
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DEBUG ((DEBUG_ERROR, "%a: StartupAllAps(): %r\n", __FUNCTION__, Status));
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return Status;
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}
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//
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// Now clear cache on the BSP too.
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//
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ClearCache (NULL);
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return EFI_SUCCESS;
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}
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//
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// Notification object for registering the callback, for when
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// EFI_PEI_MP_SERVICES_PPI becomes available.
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//
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STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR mMpServicesNotify = {
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EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | // Flags
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EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
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&gEfiPeiMpServicesPpiGuid, // Guid
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ClearCacheOnMpServicesAvailable // Notify
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};
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VOID
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InstallClearCacheCallback (
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VOID
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)
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{
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EFI_STATUS Status;
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Status = PeiServicesNotifyPpi (&mMpServicesNotify);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, "%a: failed to set up MP Services callback: %r\n",
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__FUNCTION__, Status));
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}
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}
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