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1700 lines
43 KiB
1700 lines
43 KiB
/*++
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Copyright (c) 1999 Microsoft Corporation
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Module Name:
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prefparm.c
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Abstract:
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This module contains the code for prefetcher parameter handling.
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Author:
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Cenk Ergan (cenke) 15-Mar-2000
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Revision History:
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--*/
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#include "cc.h"
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#include "zwapi.h"
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#include "prefetch.h"
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#include "preftchp.h"
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#include "stdio.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(INIT, CcPfParametersInitialize)
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#pragma alloc_text(INIT, CcPfParametersSetDefaults)
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#pragma alloc_text(PAGE, CcPfParametersRead)
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#pragma alloc_text(PAGE, CcPfParametersSave)
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#pragma alloc_text(PAGE, CcPfParametersVerify)
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#pragma alloc_text(PAGE, CcPfParametersWatcher)
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#pragma alloc_text(PAGE, CcPfParametersSetChangedEvent)
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#pragma alloc_text(PAGE, CcPfGetParameter)
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#pragma alloc_text(PAGE, CcPfSetParameter)
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#pragma alloc_text(PAGE, CcPfDetermineEnablePrefetcher)
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#pragma alloc_text(PAGE, CcPfIsHostingApplication)
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#endif // ALLOC_PRAGMA
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//
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// Globals:
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//
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extern CCPF_PREFETCHER_GLOBALS CcPfGlobals;
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//
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// Constants:
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//
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//
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// The following are used as prefixs for the value names for registry
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// parameters that are per scenario type.
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//
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WCHAR *CcPfAppLaunchScenarioTypePrefix = L"AppLaunch";
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WCHAR *CcPfBootScenarioTypePrefix = L"Boot";
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//
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// Routines for prefetcher parameter handling.
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//
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NTSTATUS
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CcPfParametersInitialize (
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PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters
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)
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/*++
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Routine Description:
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Initializes specified prefetcher parameters structure.
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Arguments:
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PrefetcherParameters - Pointer to structure to initialize.
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Return Value:
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Status.
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Environment:
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Kernel mode. IRQL == PASSIVE_LEVEL.
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Notes:
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The code & local constants for this function gets discarded after system boots.
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--*/
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{
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OBJECT_ATTRIBUTES ObjectAttributes;
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UNICODE_STRING KeyName;
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NTSTATUS Status;
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//
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// Zero out the structure. This initializes:
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// ParametersVersion
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//
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RtlZeroMemory(PrefetcherParameters, sizeof(*PrefetcherParameters));
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//
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// Initialize the lock protecting the parameters and parameters
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// version. Each time parameters are updated, the version is
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// bumped.
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//
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ExInitializeResourceLite(&PrefetcherParameters->ParametersLock);
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//
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// Initialize the workitem used for registry notifications on the
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// parameters key.
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//
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ExInitializeWorkItem(&PrefetcherParameters->RegistryWatchWorkItem,
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CcPfParametersWatcher,
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PrefetcherParameters);
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//
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// Set default parameters.
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//
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CcPfParametersSetDefaults(PrefetcherParameters);
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//
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// Create / Open the registry key that contains our parameters.
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//
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RtlInitUnicodeString(&KeyName, CCPF_PARAMETERS_KEY);
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InitializeObjectAttributes(&ObjectAttributes,
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&KeyName,
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OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
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NULL,
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NULL);
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Status = ZwCreateKey(&PrefetcherParameters->ParametersKey,
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KEY_ALL_ACCESS,
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&ObjectAttributes,
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0,
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NULL,
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REG_OPTION_NON_VOLATILE,
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0);
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if (NT_SUCCESS(Status)) {
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//
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// Update the default parameters with those in the registry.
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//
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Status = CcPfParametersRead(PrefetcherParameters);
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if (!NT_SUCCESS(Status)) {
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DBGPR((CCPFID,PFERR,"CCPF: Init-FailedReadParams=%x\n",Status));
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}
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//
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// Request notification when something changes in the
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// prefetcher parameters key.
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//
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Status = ZwNotifyChangeKey(PrefetcherParameters->ParametersKey,
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NULL,
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(PIO_APC_ROUTINE)&PrefetcherParameters->RegistryWatchWorkItem,
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(PVOID)(UINT_PTR)(unsigned int)DelayedWorkQueue,
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&PrefetcherParameters->RegistryWatchIosb,
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REG_LEGAL_CHANGE_FILTER,
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FALSE,
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&PrefetcherParameters->RegistryWatchBuffer,
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sizeof(PrefetcherParameters->RegistryWatchBuffer),
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TRUE);
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if (!NT_SUCCESS(Status)) {
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//
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// Although we could not register a notification, this
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// is not a fatal error.
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//
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DBGPR((CCPFID,PFERR,"CCPF: Init-FailedSetParamNotify=%x\n",Status));
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}
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} else {
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DBGPR((CCPFID,PFERR,"CCPF: Init-FailedCreateParamKey=%x\n",Status));
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}
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return Status;
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}
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VOID
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CcPfParametersSetDefaults (
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PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters
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)
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/*++
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Routine Description:
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Initializes specified parameters structure to default values.
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Arguments:
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Parameters - Pointer to structure to initialize.
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Return Value:
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None.
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Environment:
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Kernel mode. IRQL == PASSIVE_LEVEL.
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Notes:
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The code & local constants for this function gets discarded after system boots.
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--*/
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{
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PPF_SYSTEM_PREFETCH_PARAMETERS Parameters;
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PPF_TRACE_LIMITS TraceLimits;
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PF_SCENARIO_TYPE ScenarioType;
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//
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// Initialize locals.
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//
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Parameters = &PrefetcherParameters->Parameters;
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for (ScenarioType = 0; ScenarioType < PfMaxScenarioType; ScenarioType++) {
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//
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// PfSvNotSpecified is currently treated as disabled.
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//
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Parameters->EnableStatus[ScenarioType] = PfSvNotSpecified;
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//
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// Trace limits are determined based on scenario type.
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//
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TraceLimits = &Parameters->TraceLimits[ScenarioType];
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switch(ScenarioType) {
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case PfApplicationLaunchScenarioType:
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TraceLimits->MaxNumPages = 4000;
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TraceLimits->MaxNumSections = 170;
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TraceLimits->TimerPeriod = (-1 * 1000 * 1000 * 10);
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PrefetcherParameters->ScenarioTypePrefixes[ScenarioType] =
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CcPfAppLaunchScenarioTypePrefix;
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break;
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case PfSystemBootScenarioType:
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TraceLimits->MaxNumPages = 128000;
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TraceLimits->MaxNumSections = 4080;
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TraceLimits->TimerPeriod = (-1 * 12000 * 1000 * 10);
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PrefetcherParameters->ScenarioTypePrefixes[ScenarioType] =
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CcPfBootScenarioTypePrefix;
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break;
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default:
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//
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// We should be handling all scenario types above.
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//
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CCPF_ASSERT(FALSE);
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TraceLimits->MaxNumPages = PF_MAXIMUM_PAGES;
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TraceLimits->MaxNumSections = PF_MAXIMUM_SECTIONS;
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TraceLimits->TimerPeriod = (-1 * 1000 * 1000 * 10);
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PrefetcherParameters->ScenarioTypePrefixes[ScenarioType] = L"XXX";
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}
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}
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//
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// These limits ensure that we don't monopolize system resources
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// for prefetching.
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//
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Parameters->MaxNumActiveTraces = 8;
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Parameters->MaxNumSavedTraces = 8;
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//
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// This is the default directory under SystemRoot where we
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// find prefetch instructions for scenarios. During upgrades
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// we remove the contents of this directory, so "Prefetch" is
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// hardcoded in txtsetup.inx.
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//
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wcsncpy(Parameters->RootDirPath,
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L"Prefetch",
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PF_MAX_PREFETCH_ROOT_PATH);
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Parameters->RootDirPath[PF_MAX_PREFETCH_ROOT_PATH - 1] = 0;
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//
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// This is the default list of known hosting applications.
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//
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wcsncpy(Parameters->HostingApplicationList,
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L"DLLHOST.EXE,MMC.EXE,RUNDLL32.EXE",
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PF_HOSTING_APP_LIST_MAX_CHARS);
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Parameters->HostingApplicationList[PF_HOSTING_APP_LIST_MAX_CHARS - 1] = 0;
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//
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// Make sure the default parameters make sense.
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//
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CCPF_ASSERT(NT_SUCCESS(CcPfParametersVerify(Parameters)));
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}
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NTSTATUS
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CcPfParametersRead (
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PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters
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)
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/*++
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Routine Description:
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This routine updates the parameters structure with the
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parameters in the registry.
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Keep the value names that are used in sync with the function to
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save the parameters.
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Arguments:
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PrefetcherParameters - Pointer to parameters.
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Return Value:
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Status.
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Environment:
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Kernel mode. IRQL == PASSIVE_LEVEL.
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--*/
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{
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NTSTATUS Status;
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PF_SYSTEM_PREFETCH_PARAMETERS Parameters;
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PPF_TRACE_LIMITS TraceLimits;
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PF_SCENARIO_TYPE ScenarioType;
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WCHAR ValueName[CCPF_MAX_PARAMETER_NAME_LENGTH];
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WCHAR *ValueNamePrefix;
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HANDLE ParametersKey;
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BOOLEAN EnableStatusSpecified;
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ULONG EnablePrefetcher;
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BOOLEAN AcquiredParametersLock;
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ULONG Length;
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LONG CurrentVersion;
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ULONG RetryCount;
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PKTHREAD CurrentThread;
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//
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// Initialize locals.
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//
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CurrentThread = KeGetCurrentThread ();
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AcquiredParametersLock = FALSE;
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RetryCount = 0;
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DBGPR((CCPFID,PFTRC,"CCPF: ParametersRead()\n"));
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//
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// If we could not initialize the parameters key, we would fail
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// all the following ops miserably.
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//
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if (!PrefetcherParameters->ParametersKey) {
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Status = STATUS_REINITIALIZATION_NEEDED;
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goto cleanup;
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}
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do {
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//
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// Get the parameters lock shared.
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//
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KeEnterCriticalRegionThread(CurrentThread);
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ExAcquireResourceSharedLite(&PrefetcherParameters->ParametersLock, TRUE);
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AcquiredParametersLock = TRUE;
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ParametersKey = PrefetcherParameters->ParametersKey;
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//
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// Save current version of parameters. Each time parameters gets
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// updated, the version is bumped.
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//
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CurrentVersion = PrefetcherParameters->ParametersVersion;
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//
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// Copy over existing parameters to the parameters structure we
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// are building. This way, if we cannot get a value from the
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// registry we'll keep the value we already have.
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//
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Parameters = PrefetcherParameters->Parameters;
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//
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// Read the prefetcher enable value. Depending on whether it is
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// specified and if so its value we will set enable status for
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// prefetch scenario types.
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//
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Length = sizeof(EnablePrefetcher);
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Status = CcPfGetParameter(ParametersKey,
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L"EnablePrefetcher",
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REG_DWORD,
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&EnablePrefetcher,
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&Length);
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if (!NT_SUCCESS(Status)) {
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//
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// Enable status is not specified or we cannot access it.
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//
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EnableStatusSpecified = FALSE;
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} else {
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EnableStatusSpecified = TRUE;
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}
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//
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// Get per scenario parameters.
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//
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for (ScenarioType = 0; ScenarioType < PfMaxScenarioType; ScenarioType++) {
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ValueNamePrefix = PrefetcherParameters->ScenarioTypePrefixes[ScenarioType];
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//
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// Determine enable status. If EnableStatusSpecified, whether
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// prefeching for this scenario type is on or off is
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// determined by the ScenarioType'th bit in EnablePrefetcher.
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//
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if (EnableStatusSpecified) {
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if (EnablePrefetcher & (1 << ScenarioType)) {
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Parameters.EnableStatus[ScenarioType] = PfSvEnabled;
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} else {
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Parameters.EnableStatus[ScenarioType] = PfSvDisabled;
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}
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} else {
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Parameters.EnableStatus[ScenarioType] = PfSvNotSpecified;
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}
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//
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// Update trace limits for this scenario type. Ignore return
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// value from GetParameter since the value may not be
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// specified in the registry. If so the current value is kept
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// intact.
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//
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TraceLimits = &Parameters.TraceLimits[ScenarioType];
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wcscpy(ValueName, ValueNamePrefix);
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wcscat(ValueName, L"MaxNumPages");
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Length = sizeof(TraceLimits->MaxNumPages);
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CcPfGetParameter(ParametersKey,
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ValueName,
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REG_DWORD,
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&TraceLimits->MaxNumPages,
|
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&Length);
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wcscpy(ValueName, ValueNamePrefix);
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wcscat(ValueName, L"MaxNumSections");
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Length = sizeof(TraceLimits->MaxNumSections);
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CcPfGetParameter(ParametersKey,
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ValueName,
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REG_DWORD,
|
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&TraceLimits->MaxNumSections,
|
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&Length);
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|
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wcscpy(ValueName, ValueNamePrefix);
|
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wcscat(ValueName, L"TimerPeriod");
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Length = sizeof(TraceLimits->TimerPeriod);
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CcPfGetParameter(ParametersKey,
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ValueName,
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REG_BINARY,
|
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&TraceLimits->TimerPeriod,
|
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&Length);
|
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}
|
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|
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//
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// Update maximum number of active traces.
|
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//
|
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Length = sizeof(Parameters.MaxNumActiveTraces);
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CcPfGetParameter(ParametersKey,
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L"MaxNumActiveTraces",
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REG_DWORD,
|
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&Parameters.MaxNumActiveTraces,
|
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&Length);
|
|
|
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//
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// Update maximum number of saved traces.
|
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//
|
|
|
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Length = sizeof(Parameters.MaxNumSavedTraces);
|
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CcPfGetParameter(ParametersKey,
|
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L"MaxNumSavedTraces",
|
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REG_DWORD,
|
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&Parameters.MaxNumSavedTraces,
|
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&Length);
|
|
|
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//
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// Update the root directory path.
|
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//
|
|
|
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Length = sizeof(Parameters.RootDirPath);
|
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CcPfGetParameter(ParametersKey,
|
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L"RootDirPath",
|
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REG_SZ,
|
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Parameters.RootDirPath,
|
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&Length);
|
|
|
|
//
|
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// Update list of known hosting applications.
|
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//
|
|
|
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Length = sizeof(Parameters.HostingApplicationList);
|
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CcPfGetParameter(ParametersKey,
|
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L"HostingAppList",
|
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REG_SZ,
|
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Parameters.HostingApplicationList,
|
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&Length);
|
|
|
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Parameters.HostingApplicationList[PF_HOSTING_APP_LIST_MAX_CHARS - 1] = 0;
|
|
_wcsupr(Parameters.HostingApplicationList);
|
|
|
|
//
|
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// Verify the parameters updated from the registry.
|
|
//
|
|
|
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Status = CcPfParametersVerify(&Parameters);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
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goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Release the shared lock and acquire it exclusive.
|
|
//
|
|
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
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KeLeaveCriticalRegionThread(CurrentThread);
|
|
|
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KeEnterCriticalRegionThread(CurrentThread);
|
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ExAcquireResourceExclusiveLite(&PrefetcherParameters->ParametersLock, TRUE);
|
|
|
|
//
|
|
// Check if somebody already updated the parameters before us.
|
|
//
|
|
|
|
if (CurrentVersion != PrefetcherParameters->ParametersVersion) {
|
|
|
|
//
|
|
// Bummer. Somebody updated parameters when we released
|
|
// our shared lock to acquire it exclusive. We have to try
|
|
// again. The default values we used for parameters that
|
|
// were not in the registry may have been changed.
|
|
//
|
|
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
AcquiredParametersLock = FALSE;
|
|
|
|
RetryCount++;
|
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continue;
|
|
}
|
|
|
|
//
|
|
// We are updating the parameters, bump the version.
|
|
//
|
|
|
|
PrefetcherParameters->ParametersVersion++;
|
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|
|
PrefetcherParameters->Parameters = Parameters;
|
|
|
|
//
|
|
// Release the exclusive lock and break out.
|
|
//
|
|
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
AcquiredParametersLock = FALSE;
|
|
|
|
break;
|
|
|
|
} while (RetryCount < 10);
|
|
|
|
//
|
|
// See if we looped too many times and could not achive updating
|
|
// the parameters.
|
|
//
|
|
|
|
if (RetryCount >= 10) {
|
|
Status = STATUS_RETRY;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Otherwise we were successful.
|
|
//
|
|
|
|
Status = STATUS_SUCCESS;
|
|
|
|
cleanup:
|
|
|
|
if (AcquiredParametersLock) {
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
}
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersRead()=%x\n", Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
NTSTATUS
|
|
CcPfParametersSave (
|
|
PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine updates the registry with the specified prefetch
|
|
parameters.
|
|
|
|
Arguments:
|
|
|
|
PrefetcherParameters - Pointer to parameters structure.
|
|
|
|
Return Value:
|
|
|
|
Status.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status;
|
|
PPF_TRACE_LIMITS TraceLimits;
|
|
PF_SCENARIO_TYPE ScenarioType;
|
|
WCHAR ValueName[CCPF_MAX_PARAMETER_NAME_LENGTH];
|
|
WCHAR *ValueNamePrefix;
|
|
HANDLE ParametersKey;
|
|
BOOLEAN EnableStatusSpecified;
|
|
ULONG EnablePrefetcher;
|
|
BOOLEAN AcquiredParametersLock;
|
|
ULONG Length;
|
|
PPF_SYSTEM_PREFETCH_PARAMETERS Parameters;
|
|
PKTHREAD CurrentThread;
|
|
|
|
//
|
|
// Initialize locals.
|
|
//
|
|
|
|
CurrentThread = KeGetCurrentThread ();
|
|
ParametersKey = PrefetcherParameters->ParametersKey;
|
|
Parameters = &PrefetcherParameters->Parameters;
|
|
AcquiredParametersLock = FALSE;
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersSave()\n"));
|
|
|
|
//
|
|
// If we could not initialize the parameters key, we would fail
|
|
// all the following ops miserably.
|
|
//
|
|
|
|
if (!PrefetcherParameters->ParametersKey) {
|
|
Status = STATUS_REINITIALIZATION_NEEDED;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Get the parameters lock shared.
|
|
//
|
|
|
|
KeEnterCriticalRegionThread(CurrentThread);
|
|
ExAcquireResourceSharedLite(&PrefetcherParameters->ParametersLock, TRUE);
|
|
AcquiredParametersLock = TRUE;
|
|
|
|
//
|
|
// Build up the prefetcher enable value.
|
|
//
|
|
|
|
EnableStatusSpecified = FALSE;
|
|
EnablePrefetcher = 0;
|
|
|
|
for (ScenarioType = 0; ScenarioType < PfMaxScenarioType; ScenarioType++) {
|
|
|
|
//
|
|
// By default prefetching for all scenario types will be
|
|
// disabled, except it is explicitly enabled.
|
|
//
|
|
|
|
if (Parameters->EnableStatus[ScenarioType] == PfSvEnabled) {
|
|
EnablePrefetcher |= (1 << ScenarioType);
|
|
}
|
|
|
|
//
|
|
// Even if enable status for one scenario type is specified,
|
|
// we have to save the enable prefetcher key.
|
|
//
|
|
|
|
if (Parameters->EnableStatus[ScenarioType] != PfSvNotSpecified) {
|
|
EnableStatusSpecified = TRUE;
|
|
}
|
|
}
|
|
|
|
if (EnableStatusSpecified) {
|
|
|
|
//
|
|
// Save the prefetcher enable key.
|
|
//
|
|
|
|
Length = sizeof(EnablePrefetcher);
|
|
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
L"EnablePrefetcher",
|
|
REG_DWORD,
|
|
&EnablePrefetcher,
|
|
Length);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Save per scenario parameters.
|
|
//
|
|
|
|
for (ScenarioType = 0; ScenarioType < PfMaxScenarioType; ScenarioType++) {
|
|
|
|
ValueNamePrefix = PrefetcherParameters->ScenarioTypePrefixes[ScenarioType];
|
|
|
|
//
|
|
// Update trace limits for this scenario type.
|
|
//
|
|
|
|
TraceLimits = &Parameters->TraceLimits[ScenarioType];
|
|
|
|
wcscpy(ValueName, ValueNamePrefix);
|
|
wcscat(ValueName, L"MaxNumPages");
|
|
Length = sizeof(TraceLimits->MaxNumPages);
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
ValueName,
|
|
REG_DWORD,
|
|
&TraceLimits->MaxNumPages,
|
|
Length);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
wcscpy(ValueName, ValueNamePrefix);
|
|
wcscat(ValueName, L"MaxNumSections");
|
|
Length = sizeof(TraceLimits->MaxNumSections);
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
ValueName,
|
|
REG_DWORD,
|
|
&TraceLimits->MaxNumSections,
|
|
Length);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
wcscpy(ValueName, ValueNamePrefix);
|
|
wcscat(ValueName, L"TimerPeriod");
|
|
Length = sizeof(TraceLimits->TimerPeriod);
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
ValueName,
|
|
REG_BINARY,
|
|
&TraceLimits->TimerPeriod,
|
|
Length);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Update maximum number of active traces.
|
|
//
|
|
|
|
Length = sizeof(Parameters->MaxNumActiveTraces);
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
L"MaxNumActiveTraces",
|
|
REG_DWORD,
|
|
&Parameters->MaxNumActiveTraces,
|
|
Length);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Update maximum number of saved traces.
|
|
//
|
|
|
|
Length = sizeof(Parameters->MaxNumSavedTraces);
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
L"MaxNumSavedTraces",
|
|
REG_DWORD,
|
|
&Parameters->MaxNumSavedTraces,
|
|
Length);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Update the root directory path.
|
|
//
|
|
|
|
Length = (wcslen(Parameters->RootDirPath) + 1) * sizeof(WCHAR);
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
L"RootDirPath",
|
|
REG_SZ,
|
|
Parameters->RootDirPath,
|
|
Length);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Update the hosting application list path.
|
|
//
|
|
|
|
Length = (wcslen(Parameters->HostingApplicationList) + 1) * sizeof(WCHAR);
|
|
Status = CcPfSetParameter(ParametersKey,
|
|
L"HostingAppList",
|
|
REG_SZ,
|
|
Parameters->HostingApplicationList,
|
|
Length);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
Status = STATUS_SUCCESS;
|
|
|
|
cleanup:
|
|
|
|
if (AcquiredParametersLock) {
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
}
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersSave()=%x\n", Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
NTSTATUS
|
|
CcPfParametersVerify (
|
|
PPF_SYSTEM_PREFETCH_PARAMETERS Parameters
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine verifies that the specified parameters structure is
|
|
valid and within sanity limits.
|
|
|
|
Arguments:
|
|
|
|
Parameters - Pointer to parameters structure.
|
|
|
|
Return Value:
|
|
|
|
Status.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status;
|
|
ULONG FailedCheckId;
|
|
ULONG CharIdx;
|
|
BOOLEAN FoundNUL;
|
|
PF_SCENARIO_TYPE ScenarioType;
|
|
PPF_TRACE_LIMITS TraceLimits;
|
|
|
|
//
|
|
// Initialize locals.
|
|
//
|
|
|
|
Status = STATUS_INVALID_PARAMETER;
|
|
FailedCheckId = 0;
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersVerify\n"));
|
|
|
|
//
|
|
// Make sure RootDirPath is NUL terminated.
|
|
//
|
|
|
|
FoundNUL = FALSE;
|
|
|
|
for (CharIdx = 0; CharIdx < PF_MAX_PREFETCH_ROOT_PATH; CharIdx++) {
|
|
if (Parameters->RootDirPath[CharIdx] == 0) {
|
|
FoundNUL = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (FoundNUL == FALSE) {
|
|
FailedCheckId = 10;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Make sure HostingApplicationList is NUL terminated.
|
|
//
|
|
|
|
FoundNUL = FALSE;
|
|
|
|
for (CharIdx = 0; CharIdx < PF_HOSTING_APP_LIST_MAX_CHARS; CharIdx++) {
|
|
if (Parameters->HostingApplicationList[CharIdx] == 0) {
|
|
FoundNUL = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (FoundNUL == FALSE) {
|
|
FailedCheckId = 15;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Make sure all per scenario type parameters types are within
|
|
// sanity limits.
|
|
//
|
|
|
|
for (ScenarioType = 0; ScenarioType < PfMaxScenarioType; ScenarioType++) {
|
|
|
|
if (Parameters->EnableStatus[ScenarioType] >= PfSvMaxEnableStatus) {
|
|
FailedCheckId = 20;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Check trace limits.
|
|
//
|
|
|
|
TraceLimits = &Parameters->TraceLimits[ScenarioType];
|
|
|
|
if (TraceLimits->MaxNumPages > PF_MAXIMUM_PAGES) {
|
|
FailedCheckId = 30;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (TraceLimits->MaxNumSections > PF_MAXIMUM_SECTIONS) {
|
|
FailedCheckId = 40;
|
|
goto cleanup;
|
|
}
|
|
|
|
if ((TraceLimits->TimerPeriod < PF_MAXIMUM_TIMER_PERIOD) ||
|
|
(TraceLimits->TimerPeriod >= 0)) {
|
|
FailedCheckId = 50;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Check limits on active/saved traces.
|
|
//
|
|
|
|
if (Parameters->MaxNumActiveTraces > PF_MAXIMUM_ACTIVE_TRACES) {
|
|
FailedCheckId = 60;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (Parameters->MaxNumSavedTraces > PF_MAXIMUM_SAVED_TRACES) {
|
|
FailedCheckId = 70;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// We passed all the checks.
|
|
//
|
|
|
|
Status = STATUS_SUCCESS;
|
|
|
|
cleanup:
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersVerify()=%x,%d\n", Status, FailedCheckId));
|
|
|
|
return Status;
|
|
}
|
|
|
|
VOID
|
|
CcPfParametersWatcher(
|
|
IN PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine gets called when our parameters in the registry change.
|
|
|
|
Arguments:
|
|
|
|
PrefetcherParameters - Pointer to parameters structure.
|
|
|
|
Return Value:
|
|
|
|
None.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status;
|
|
UNICODE_STRING KeyName;
|
|
OBJECT_ATTRIBUTES ObjectAttributes;
|
|
HANDLE ParametersKey;
|
|
PKTHREAD CurrentThread;
|
|
HANDLE TempHandle;
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersWatcher()\n"));
|
|
|
|
//
|
|
// In order to have setup a registry watch, we should have
|
|
// initialized the parameters key successfully.
|
|
//
|
|
|
|
CCPF_ASSERT(PrefetcherParameters->ParametersKey);
|
|
|
|
//
|
|
// Our change notify triggered. Request further notification. But
|
|
// first wait until we can get the parameters lock exclusive, so
|
|
// while we are saving parameters to the registry we don't kick
|
|
// off a notification for each key.
|
|
//
|
|
|
|
CurrentThread = KeGetCurrentThread ();
|
|
KeEnterCriticalRegionThread(CurrentThread);
|
|
ExAcquireResourceExclusiveLite(&PrefetcherParameters->ParametersLock, TRUE);
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
|
|
Status = ZwNotifyChangeKey(PrefetcherParameters->ParametersKey,
|
|
NULL,
|
|
(PIO_APC_ROUTINE)&PrefetcherParameters->RegistryWatchWorkItem,
|
|
(PVOID)(UINT_PTR)(unsigned int)DelayedWorkQueue,
|
|
&PrefetcherParameters->RegistryWatchIosb,
|
|
REG_LEGAL_CHANGE_FILTER,
|
|
FALSE,
|
|
&PrefetcherParameters->RegistryWatchBuffer,
|
|
sizeof(PrefetcherParameters->RegistryWatchBuffer),
|
|
TRUE);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
|
|
//
|
|
// Somebody may have deleted the key. We have to recreate it then.
|
|
//
|
|
|
|
if (Status == STATUS_KEY_DELETED) {
|
|
|
|
RtlInitUnicodeString(&KeyName, CCPF_PARAMETERS_KEY);
|
|
|
|
InitializeObjectAttributes(&ObjectAttributes,
|
|
&KeyName,
|
|
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
|
|
NULL,
|
|
NULL);
|
|
|
|
Status = ZwCreateKey(&ParametersKey,
|
|
KEY_ALL_ACCESS,
|
|
&ObjectAttributes,
|
|
0,
|
|
NULL,
|
|
REG_OPTION_NON_VOLATILE,
|
|
0);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
DBGPR((CCPFID,PFERR,"CCPF: ParametersWatcher-FailedRecreate=%x\n",Status));
|
|
return;
|
|
}
|
|
|
|
//
|
|
// Update global key handle.
|
|
//
|
|
|
|
KeEnterCriticalRegionThread(CurrentThread);
|
|
ExAcquireResourceExclusiveLite(&PrefetcherParameters->ParametersLock, TRUE);
|
|
|
|
TempHandle = PrefetcherParameters->ParametersKey;
|
|
PrefetcherParameters->ParametersKey = ParametersKey;
|
|
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
|
|
ZwClose(TempHandle);
|
|
|
|
//
|
|
// Retry setting a notification again.
|
|
//
|
|
|
|
Status = ZwNotifyChangeKey(PrefetcherParameters->ParametersKey,
|
|
NULL,
|
|
(PIO_APC_ROUTINE)&PrefetcherParameters->RegistryWatchWorkItem,
|
|
(PVOID)(UINT_PTR)(unsigned int)DelayedWorkQueue,
|
|
&PrefetcherParameters->RegistryWatchIosb,
|
|
REG_LEGAL_CHANGE_FILTER,
|
|
FALSE,
|
|
&PrefetcherParameters->RegistryWatchBuffer,
|
|
sizeof(PrefetcherParameters->RegistryWatchBuffer),
|
|
TRUE);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
DBGPR((CCPFID,PFERR,"CCPF: ParametersWatcher-FailedReSetNotify=%x\n",Status));
|
|
return;
|
|
}
|
|
|
|
} else {
|
|
DBGPR((CCPFID,PFERR,"CCPF: ParametersWatcher-FailedSetNotify=%x\n",Status));
|
|
return;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Update the global parameters.
|
|
//
|
|
|
|
Status = CcPfParametersRead(PrefetcherParameters);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
//
|
|
// Determine if prefetching is enabled.
|
|
//
|
|
|
|
CcPfDetermineEnablePrefetcher();
|
|
|
|
//
|
|
// Set the event so the service queries for the latest parameters.
|
|
//
|
|
|
|
CcPfParametersSetChangedEvent(PrefetcherParameters);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
NTSTATUS
|
|
CcPfParametersSetChangedEvent(
|
|
PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine tries to open and set the event that tells the
|
|
service system prefetch parameters have changed.
|
|
|
|
Arguments:
|
|
|
|
None.
|
|
|
|
Return Value:
|
|
|
|
Status.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status;
|
|
UNICODE_STRING EventName;
|
|
OBJECT_ATTRIBUTES EventObjAttr;
|
|
HANDLE EventHandle;
|
|
PKTHREAD CurrentThread;
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersSetChangedEvent()\n"));
|
|
|
|
//
|
|
// If we have already opened the event, just signal it.
|
|
//
|
|
|
|
if (PrefetcherParameters->ParametersChangedEvent) {
|
|
|
|
ZwSetEvent(PrefetcherParameters->ParametersChangedEvent, NULL);
|
|
|
|
Status = STATUS_SUCCESS;
|
|
|
|
} else {
|
|
|
|
//
|
|
// Try to open the event. We don't open this at initialization
|
|
// because our service may not have started to create this
|
|
// event yet. If csrss.exe has not initialized, we may not
|
|
// even have the BaseNamedObjects object directory created, in
|
|
// which Win32 events reside.
|
|
//
|
|
|
|
RtlInitUnicodeString(&EventName, PF_PARAMETERS_CHANGED_EVENT_NAME);
|
|
|
|
InitializeObjectAttributes(&EventObjAttr,
|
|
&EventName,
|
|
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
|
|
NULL,
|
|
NULL);
|
|
|
|
Status = ZwOpenEvent(&EventHandle,
|
|
EVENT_ALL_ACCESS,
|
|
&EventObjAttr);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
//
|
|
// Acquire the lock and set the global handle.
|
|
//
|
|
CurrentThread = KeGetCurrentThread ();
|
|
|
|
KeEnterCriticalRegionThread(CurrentThread);
|
|
ExAcquireResourceExclusiveLite(&PrefetcherParameters->ParametersLock, TRUE);
|
|
|
|
if (!PrefetcherParameters->ParametersChangedEvent) {
|
|
|
|
//
|
|
// Set the global handle.
|
|
//
|
|
|
|
PrefetcherParameters->ParametersChangedEvent = EventHandle;
|
|
CCPF_ASSERT(EventHandle);
|
|
|
|
EventHandle = NULL;
|
|
}
|
|
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
|
|
if (EventHandle != NULL) {
|
|
//
|
|
// Somebody already initialized the global handle
|
|
// before us. Close our handle and use the one they
|
|
// initialized.
|
|
//
|
|
|
|
ZwClose(EventHandle);
|
|
}
|
|
|
|
|
|
//
|
|
// We have an event now. Signal it.
|
|
//
|
|
|
|
ZwSetEvent(PrefetcherParameters->ParametersChangedEvent, NULL);
|
|
}
|
|
}
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: ParametersSetChangedEvent()=%x\n", Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
NTSTATUS
|
|
CcPfGetParameter (
|
|
HANDLE ParametersKey,
|
|
WCHAR *ValueNameBuffer,
|
|
ULONG ValueType,
|
|
PVOID Value,
|
|
ULONG *ValueSize
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine queries a value under the specified registry into the
|
|
specified buffer. Contents of Value and ValueSize are not changed
|
|
if returning failure.
|
|
|
|
Arguments:
|
|
|
|
ParametersKey - Handle to key to query value under.
|
|
|
|
ValueNameBuffer - Name of the value.
|
|
|
|
ValueType - What the type of that value should be. (e.g. REG_DWORD).
|
|
|
|
Value - Queried value data gets put here.
|
|
|
|
ValueSize - Size of Value buffer in bytes. On successful return
|
|
this is set to number of bytes copied into Value.
|
|
|
|
Return Value:
|
|
|
|
Status.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
UNICODE_STRING ValueName;
|
|
CHAR Buffer[CCPF_MAX_PARAMETER_VALUE_BUFFER];
|
|
PKEY_VALUE_PARTIAL_INFORMATION ValueBuffer;
|
|
ULONG Length;
|
|
NTSTATUS Status;
|
|
|
|
//
|
|
// Initialize locals.
|
|
//
|
|
|
|
ValueBuffer = (PKEY_VALUE_PARTIAL_INFORMATION) Buffer;
|
|
Length = CCPF_MAX_PARAMETER_VALUE_BUFFER;
|
|
RtlInitUnicodeString(&ValueName, ValueNameBuffer);
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: GetParameter(%ws,%x)\n", ValueNameBuffer, ValueType));
|
|
|
|
//
|
|
// Query value.
|
|
//
|
|
|
|
Status = ZwQueryValueKey(ParametersKey,
|
|
&ValueName,
|
|
KeyValuePartialInformation,
|
|
ValueBuffer,
|
|
Length,
|
|
&Length);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Make sure ZwQueryValue returns valid information.
|
|
//
|
|
|
|
if (Length < sizeof(KEY_VALUE_PARTIAL_INFORMATION)) {
|
|
CCPF_ASSERT(Length >= sizeof(KEY_VALUE_PARTIAL_INFORMATION));
|
|
Status = STATUS_UNSUCCESSFUL;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Check value type.
|
|
//
|
|
|
|
if (ValueBuffer->Type != ValueType) {
|
|
Status = STATUS_OBJECT_TYPE_MISMATCH;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Check if data will fit into the buffer caller passed in.
|
|
//
|
|
|
|
if (ValueBuffer->DataLength > *ValueSize) {
|
|
Status = STATUS_BUFFER_TOO_SMALL;
|
|
goto cleanup;
|
|
}
|
|
|
|
//
|
|
// Copy data into user's buffer.
|
|
//
|
|
|
|
RtlCopyMemory(Value, ValueBuffer->Data, ValueBuffer->DataLength);
|
|
|
|
//
|
|
// Set copied number of bytes.
|
|
//
|
|
|
|
*ValueSize = ValueBuffer->DataLength;
|
|
|
|
Status = STATUS_SUCCESS;
|
|
|
|
cleanup:
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: GetParameter(%ws)=%x\n", ValueNameBuffer, Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
NTSTATUS
|
|
CcPfSetParameter (
|
|
HANDLE ParametersKey,
|
|
WCHAR *ValueNameBuffer,
|
|
ULONG ValueType,
|
|
PVOID Value,
|
|
ULONG ValueSize
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine sets a parameter under the specified registry.
|
|
|
|
Arguments:
|
|
|
|
ParametersKey - Handle to key to query value under.
|
|
|
|
ValueNameBuffer - Name of the value.
|
|
|
|
ValueType - What the type of that value should be. (e.g. REG_DWORD).
|
|
|
|
Value - Data to save.
|
|
|
|
ValueSize - Size of Value buffer in bytes.
|
|
|
|
Return Value:
|
|
|
|
Status.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
UNICODE_STRING ValueName;
|
|
NTSTATUS Status;
|
|
|
|
//
|
|
// Initialize locals.
|
|
//
|
|
|
|
RtlInitUnicodeString(&ValueName, ValueNameBuffer);
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: SetParameter(%ws,%x)\n", ValueNameBuffer, ValueType));
|
|
|
|
//
|
|
// Save the value.
|
|
//
|
|
|
|
Status = ZwSetValueKey(ParametersKey,
|
|
&ValueName,
|
|
0,
|
|
ValueType,
|
|
Value,
|
|
ValueSize);
|
|
|
|
//
|
|
// Return the status.
|
|
//
|
|
|
|
DBGPR((CCPFID,PFTRC,"CCPF: SetParameter(%ws)=%x\n", ValueNameBuffer, Status));
|
|
|
|
return Status;
|
|
}
|
|
|
|
LOGICAL
|
|
CcPfDetermineEnablePrefetcher(
|
|
VOID
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine sets the global CcPfEnablePrefetcher based on the
|
|
EnableStatus'es for all scenario types in global parameters as
|
|
well as other factors, such as whether we have booted safe mode.
|
|
|
|
Note: Acquires Parameters lock exclusive.
|
|
|
|
Arguments:
|
|
|
|
None.
|
|
|
|
Return Value:
|
|
|
|
New value of CcPfEnablePrefetcher.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
PF_SCENARIO_TYPE ScenarioType;
|
|
LOGICAL EnablePrefetcher;
|
|
PKTHREAD CurrentThread;
|
|
BOOLEAN IgnoreBootScenarioType;
|
|
PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters;
|
|
|
|
extern PF_BOOT_PHASE_ID CcPfBootPhase;
|
|
|
|
//
|
|
// Initialize locals.
|
|
//
|
|
|
|
EnablePrefetcher = FALSE;
|
|
PrefetcherParameters = &CcPfGlobals.Parameters;
|
|
CurrentThread = KeGetCurrentThread ();
|
|
|
|
//
|
|
// Ignore whether prefetching is enabled for boot, if we've
|
|
// already past the point in boot where this matters.
|
|
//
|
|
|
|
IgnoreBootScenarioType = (CcPfBootPhase >= PfSessionManagerInitPhase) ? TRUE : FALSE;
|
|
|
|
KeEnterCriticalRegionThread(CurrentThread);
|
|
ExAcquireResourceExclusiveLite(&PrefetcherParameters->ParametersLock, TRUE);
|
|
|
|
//
|
|
// If we have booted to safe mode, the prefetcher will be disabled.
|
|
//
|
|
|
|
if (InitSafeBootMode) {
|
|
|
|
EnablePrefetcher = FALSE;
|
|
|
|
} else {
|
|
|
|
//
|
|
// By default prefetching is disabled. If prefetching is
|
|
// enabled for any scenario type, then the prefetcher is
|
|
// enabled.
|
|
//
|
|
|
|
for (ScenarioType = 0; ScenarioType < PfMaxScenarioType; ScenarioType++) {
|
|
|
|
//
|
|
// Skip enable status for the boot scenario if requested.
|
|
//
|
|
|
|
if (IgnoreBootScenarioType) {
|
|
if (ScenarioType == PfSystemBootScenarioType) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (PrefetcherParameters->Parameters.EnableStatus[ScenarioType] == PfSvEnabled) {
|
|
EnablePrefetcher = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Update global enable status.
|
|
//
|
|
|
|
CcPfEnablePrefetcher = EnablePrefetcher;
|
|
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
|
|
return CcPfEnablePrefetcher;
|
|
}
|
|
|
|
BOOLEAN
|
|
CcPfIsHostingApplication(
|
|
IN PWCHAR ExecutableName
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine determines whether the specified executable is in the
|
|
list of known hosting applications, e.g. rundll32, dllhost etc.
|
|
|
|
Arguments:
|
|
|
|
ExecutableName - NUL terminated UPCASED executable name, e.g. "MMC.EXE"
|
|
|
|
Return Value:
|
|
|
|
TRUE - Executable is for a known hosting application.
|
|
|
|
FALSE - It is not.
|
|
|
|
Environment:
|
|
|
|
Kernel mode. IRQL == PASSIVE_LEVEL.
|
|
|
|
--*/
|
|
|
|
{
|
|
PCCPF_PREFETCHER_PARAMETERS PrefetcherParameters;
|
|
PKTHREAD CurrentThread;
|
|
PWCHAR CurrentPosition;
|
|
PWCHAR ListStart;
|
|
PWCHAR ListEnd;
|
|
ULONG ExecutableNameLength;
|
|
BOOLEAN FoundInList;
|
|
|
|
//
|
|
// Initialize locals.
|
|
//
|
|
|
|
PrefetcherParameters = &CcPfGlobals.Parameters;
|
|
CurrentThread = KeGetCurrentThread();
|
|
ExecutableNameLength = wcslen(ExecutableName);
|
|
FoundInList = FALSE;
|
|
|
|
//
|
|
// Get the parameters lock for read.
|
|
//
|
|
|
|
KeEnterCriticalRegionThread(CurrentThread);
|
|
ExAcquireResourceSharedLite(&PrefetcherParameters->ParametersLock, TRUE);
|
|
|
|
//
|
|
// Search for executable in hosting application list.
|
|
//
|
|
|
|
ListStart = PrefetcherParameters->Parameters.HostingApplicationList;
|
|
ListEnd = ListStart + wcslen(PrefetcherParameters->Parameters.HostingApplicationList);
|
|
|
|
for (CurrentPosition = wcsstr(ListStart, ExecutableName);
|
|
CurrentPosition != NULL;
|
|
CurrentPosition = wcsstr(CurrentPosition + 1, ExecutableName)) {
|
|
|
|
//
|
|
// We should not go beyond the limits.
|
|
//
|
|
|
|
if (CurrentPosition < ListStart || CurrentPosition >= ListEnd) {
|
|
CCPF_ASSERT(CurrentPosition >= ListStart);
|
|
CCPF_ASSERT(CurrentPosition < ListEnd);
|
|
break;
|
|
}
|
|
|
|
//
|
|
// It should be the first item in the list or be preceded by a comma.
|
|
//
|
|
|
|
if (CurrentPosition != ListStart && *(CurrentPosition - 1) != L',') {
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// It should be the last item in the list or be followed by a comma.
|
|
//
|
|
|
|
if (CurrentPosition + ExecutableNameLength != ListEnd &&
|
|
CurrentPosition[ExecutableNameLength] != L',') {
|
|
continue;
|
|
}
|
|
|
|
//
|
|
// We found it in the list.
|
|
//
|
|
|
|
FoundInList = TRUE;
|
|
break;
|
|
|
|
}
|
|
|
|
//
|
|
// Release the parameters lock.
|
|
//
|
|
|
|
ExReleaseResourceLite(&PrefetcherParameters->ParametersLock);
|
|
KeLeaveCriticalRegionThread(CurrentThread);
|
|
|
|
//
|
|
// Return whether the executable was found in the list.
|
|
//
|
|
|
|
return FoundInList;
|
|
}
|
|
|