[edk2-devel] [PATCH v2 3/4] MdeModulePkg: PeiMain: Introduce implementation of delayed dispatch
Kun Qin
kuqin12 at gmail.com
Tue Oct 10 00:18:54 UTC 2023
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4496
This change adds the implementation that fits the needs and description
of PI spec defined Delayed Dispatch PPI in Pei Core.
The PPI would allow minimal delay for registered callbacks. As well as
allowing other functions to wait for GUIDed delayed dispatch callbacks.
Cc: Jian J Wang <jian.j.wang at intel.com>
Cc: Dandan Bi <dandan.bi at intel.com>
Cc: Liming Gao <gaoliming at byosoft.com.cn>
Cc: Debkumar De <debkumar.de at intel.com>
Cc: Catharine West <catharine.west at intel.com>
Co-authored-by: Mike Turner <mikeyt at pobox.com>
Signed-off-by: Kun Qin <kuqin12 at gmail.com>
---
Notes:
v2:
- Fixed function documentation [Liming]
- Removed GUID declaration internal to PEI core [Liming]
- Removed max entry PCD declaration and use macro instead [Liming]
- Added "PRODUCED" in inf [Liming]
MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c | 366 ++++++++++++++++++++
MdeModulePkg/Core/Pei/PeiMain/PeiMain.c | 3 +
MdeModulePkg/Core/Pei/PeiMain.h | 76 ++++
MdeModulePkg/Core/Pei/PeiMain.inf | 5 +
MdeModulePkg/MdeModulePkg.dec | 8 +
5 files changed, 458 insertions(+)
diff --git a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
index 5f32ebb560ae..f7f4cce84174 100644
--- a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
+++ b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
@@ -3,14 +3,354 @@
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
+Copyright (c) Microsoft Corporation.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "PeiMain.h"
+//
+// Maximal number of Delayed Dispatch entries supported
+//
+#define DELAYED_DISPATCH_MAX_ENTRIES 8
+
+//
+// Utility global variables
+//
+
+// Delayed Dispatch table GUID
+EFI_GUID gEfiDelayedDispatchTableGuid = {
+ 0x4b733449, 0x8eff, 0x488c, { 0x92, 0x1a, 0x15, 0x4a, 0xda, 0x25, 0x18, 0x07 }
+};
+
+/**
+ DelayedDispatchDispatcher
+
+ ayed Dispach cycle (ie one pass) through each entry, calling functions when their
+ e has expired. When UniqueId is specified, if there are any of the specified entries
+ the dispatch queue during dispatch, repeat the DelayedDispatch cycle.
+
+ @param DelayedDispatchTable Pointer to dispatch table
+ @param OPTIONAL UniqueId used to insure particular time is met.
+
+ @return BOOLEAN
+**/
+BOOLEAN
+DelayedDispatchDispatcher (
+ IN DELAYED_DISPATCH_TABLE *DelayedDispatchTable,
+ IN EFI_GUID *UniqueId OPTIONAL
+ );
+
+/**
+ DelayedDispatch End of PEI callback function. Insure that all of the delayed dispatch
+ entries are complete before exiting PEI.
+
+ @param[in] PeiServices - Pointer to PEI Services Table.
+ @param[in] NotifyDesc - Pointer to the descriptor for the Notification event that
+ caused this function to execute.
+ @param[in] Ppi - Pointer to the PPI data associated with this function.
+
+ @retval EFI_STATUS - Always return EFI_SUCCESS
+**/
+EFI_STATUS
+EFIAPI
+PeiDelayedDispatchOnEndOfPei (
+ IN EFI_PEI_SERVICES **PeiServices,
+ IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDesc,
+ IN VOID *Ppi
+ );
+
+EFI_DELAYED_DISPATCH_PPI mDelayedDispatchPpi = { PeiDelayedDispatchRegister, PeiDelayedDispatchWaitOnUniqueId };
+EFI_PEI_PPI_DESCRIPTOR mDelayedDispatchDesc = {
+ (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
+ &gEfiPeiDelayedDispatchPpiGuid,
+ &mDelayedDispatchPpi
+};
+
+EFI_PEI_NOTIFY_DESCRIPTOR mDelayedDispatchNotifyDesc = {
+ EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
+ &gEfiEndOfPeiSignalPpiGuid,
+ PeiDelayedDispatchOnEndOfPei
+};
+
+/**
+ Helper function to look up DELAYED_DISPATCH_TABLE published in HOB.
+
+ @return Pointer to DELAYED_DISPATCH_TABLE from HOB
+**/
+DELAYED_DISPATCH_TABLE *
+GetDelayedDispatchTable (
+ VOID
+ )
+{
+ EFI_HOB_GUID_TYPE *GuidHob;
+
+ GuidHob = GetFirstGuidHob (&gEfiDelayedDispatchTableGuid);
+ if (NULL == GuidHob) {
+ DEBUG ((DEBUG_ERROR, "Delayed Dispatch PPI ERROR - Delayed Dispatch Hob not available.\n"));
+ ASSERT (FALSE);
+ return NULL;
+ }
+
+ return (DELAYED_DISPATCH_TABLE *)GET_GUID_HOB_DATA (GuidHob);
+}
+
+/**
+ Register a callback to be called after a minimum delay has occurred.
+
+ This service is the single member function of the EFI_DELAYED_DISPATCH_PPI
+
+ @param[in] This Pointer to the EFI_DELAYED_DISPATCH_PPI instance
+ @param[in] Function Function to call back
+ @param[in] Context Context data
+ @param[in] UniqueId GUID for this Delayed Dispatch request.
+ @param[in] Delay Delay interval
+
+ @retval EFI_SUCCESS Function successfully loaded
+ @retval EFI_INVALID_PARAMETER One of the Arguments is not supported
+ @retval EFI_OUT_OF_RESOURCES No more entries
+
+**/
+EFI_STATUS
+EFIAPI
+PeiDelayedDispatchRegister (
+ IN EFI_DELAYED_DISPATCH_PPI *This,
+ IN EFI_DELAYED_DISPATCH_FUNCTION Function,
+ IN UINT64 Context,
+ IN EFI_GUID *UniqueId OPTIONAL,
+ IN UINT32 Delay
+ )
+{
+ DELAYED_DISPATCH_TABLE *DelayedDispatchTable;
+ DELAYED_DISPATCH_ENTRY *Entry;
+
+ // Check input parameters
+ if ((NULL == Function) || (Delay > FixedPcdGet32 (PcdDelayedDispatchMaxDelayUs)) || (NULL == This)) {
+ DEBUG ((DEBUG_ERROR, "%a Invalid parameter\n", __func__));
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // Get delayed dispatch table
+ DelayedDispatchTable = GetDelayedDispatchTable ();
+ if (NULL == DelayedDispatchTable) {
+ DEBUG ((DEBUG_ERROR, "%a Unable to locate dispatch table\n", __func__));
+ return EFI_UNSUPPORTED;
+ }
+
+ // Check for available entry slots
+ if (DelayedDispatchTable->Count >= DELAYED_DISPATCH_MAX_ENTRIES) {
+ ASSERT (DelayedDispatchTable->Count < DELAYED_DISPATCH_MAX_ENTRIES);
+ DEBUG ((DEBUG_ERROR, "%a Too many entries requested\n", __func__));
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ Entry = &(DelayedDispatchTable->Entry[DelayedDispatchTable->Count]);
+ Entry->Function = Function;
+ Entry->Context = Context;
+ Entry->DispatchTime = GET_TIME_IN_US () + Delay;
+ if (NULL != UniqueId) {
+ CopyGuid (&Entry->UniqueId, UniqueId);
+ } else {
+ ZeroMem (&Entry->UniqueId, sizeof (EFI_GUID));
+ }
+
+ Entry->MicrosecondDelay = Delay;
+ DelayedDispatchTable->Count++;
+
+ DEBUG ((DEBUG_INFO, "%a Adding dispatch Entry\n", __func__));
+ DEBUG ((DEBUG_INFO, " Requested Delay = %d\n", Delay));
+ DEBUG ((DEBUG_INFO, " Trigger Time = %d\n", Entry->DispatchTime));
+ DEBUG ((DEBUG_INFO, " Context = 0x%08lx\n", Entry->Context));
+ DEBUG ((DEBUG_INFO, " Function = %p\n", Entry->Function));
+ DEBUG ((DEBUG_INFO, " GuidHandle = %g\n", &(Entry->UniqueId)));
+
+ if (0 == Delay) {
+ // Force early dispatch point
+ DelayedDispatchDispatcher (DelayedDispatchTable, NULL);
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ DelayedDispatchDispatcher
+
+ Delayed Dispach cycle (ie one pass) through each entry, calling functions when their
+ time has expired. When UniqueId is specified, if there are any of the specified entries
+ in the dispatch queue during dispatch, repeat the DelayedDispatch cycle.
+
+ @param DelayedDispatchTable Pointer to dispatch table
+ @param OPTIONAL UniqueId used to insure particular time is met.
+
+ @return BOOLEAN
+**/
+BOOLEAN
+DelayedDispatchDispatcher (
+ IN DELAYED_DISPATCH_TABLE *DelayedDispatchTable,
+ IN EFI_GUID *UniqueId OPTIONAL
+ )
+{
+ BOOLEAN Dispatched;
+ UINT32 TimeCurrent;
+ UINT32 MaxDispatchTime;
+ UINTN Index1;
+ BOOLEAN UniqueIdPresent;
+ DELAYED_DISPATCH_ENTRY *Entry;
+
+ Dispatched = FALSE;
+ UniqueIdPresent = TRUE;
+ MaxDispatchTime = GET_TIME_IN_US () + FixedPcdGet32 (PcdDelayedDispatchCompletionTimeoutUs);
+ while ((DelayedDispatchTable->Count > 0) && (UniqueIdPresent)) {
+ UniqueIdPresent = FALSE;
+ DelayedDispatchTable->DispCount++;
+
+ // If dispatching is messed up, clear DelayedDispatchTable and exit.
+ TimeCurrent = GET_TIME_IN_US ();
+ if (TimeCurrent > MaxDispatchTime) {
+ DEBUG ((DEBUG_ERROR, "%a - DelayedDispatch Completion timeout!\n", __func__));
+ ReportStatusCode ((EFI_ERROR_MAJOR | EFI_ERROR_CODE), (EFI_SOFTWARE_PEI_CORE | EFI_SW_EC_ABORTED));
+ ASSERT (FALSE);
+ DelayedDispatchTable->Count = 0;
+ break;
+ }
+
+ // Check each entry in the table for possible dispatch
+ for (Index1 = 0; Index1 < DelayedDispatchTable->Count;) {
+ Entry = &(DelayedDispatchTable->Entry[Index1]);
+ // If UniqueId is present, insure there is an additional check of the table.
+ if (NULL != UniqueId) {
+ if (CompareGuid (UniqueId, &Entry->UniqueId)) {
+ UniqueIdPresent = TRUE;
+ }
+ }
+
+ TimeCurrent = GET_TIME_IN_US ();
+ if (TimeCurrent >= Entry->DispatchTime) {
+ // Time expired, invoked the function
+ DEBUG ((
+ DEBUG_ERROR,
+ "Delayed dispatch entry %d @ %p, Target=%d, Act=%d Disp=%d\n",
+ Index1,
+ Entry->Function,
+ Entry->DispatchTime,
+ TimeCurrent,
+ DelayedDispatchTable->DispCount
+ ));
+ Dispatched = TRUE;
+ Entry->MicrosecondDelay = 0;
+ Entry->Function (
+ &Entry->Context,
+ &Entry->MicrosecondDelay
+ );
+ DEBUG ((DEBUG_ERROR, "Delayed dispatch Function returned delay=%d\n", Entry->MicrosecondDelay));
+ if (0 == Entry->MicrosecondDelay) {
+ // NewTime = 0 = delete this entry from the table
+ DelayedDispatchTable->Count--;
+ CopyMem (Entry, Entry+1, sizeof (DELAYED_DISPATCH_ENTRY) * (DelayedDispatchTable->Count - Index1));
+ } else {
+ if (Entry->MicrosecondDelay > FixedPcdGet32 (PcdDelayedDispatchMaxDelayUs)) {
+ DEBUG ((DEBUG_ERROR, "%a Illegal new delay %d requested\n", __func__, Entry->MicrosecondDelay));
+ ASSERT (FALSE);
+ Entry->MicrosecondDelay = FixedPcdGet32 (PcdDelayedDispatchMaxDelayUs);
+ }
+
+ // NewTime != 0 - update the time from us to Dispatch time
+ Entry->DispatchTime = GET_TIME_IN_US () + Entry->MicrosecondDelay;
+ Index1++;
+ }
+ } else {
+ Index1++;
+ }
+ }
+ }
+
+ return Dispatched;
+}
+
+/**
+ Wait on a registered Delayed Dispatch unit that has a UniqueId. Continue
+ to dispatch all registered delayed dispatch entries until *ALL* entries with
+ UniqueId have completed.
+
+ @param[in] This The Delayed Dispatch PPI pointer.
+ @param[in] UniqueId UniqueId of delayed dispatch entry.
+
+ @retval EFI_SUCCESS The operation succeeds.
+ @retval EFI_INVALID_PARAMETER The parameters are invalid.
+
+**/
+EFI_STATUS
+EFIAPI
+PeiDelayedDispatchWaitOnUniqueId (
+ IN EFI_DELAYED_DISPATCH_PPI *This,
+ IN EFI_GUID *UniqueId
+ )
+{
+ PERF_FUNCTION_BEGIN ();
+ DELAYED_DISPATCH_TABLE *DelayedDispatchTable;
+
+ // Get delayed dispatch table
+ DelayedDispatchTable = GetDelayedDispatchTable ();
+ if (NULL == DelayedDispatchTable) {
+ PERF_FUNCTION_END ();
+ return EFI_UNSUPPORTED;
+ }
+
+ if ((NULL == UniqueId) || (IsZeroGuid (UniqueId))) {
+ ASSERT (FALSE);
+ PERF_FUNCTION_END ();
+ return EFI_UNSUPPORTED;
+ }
+
+ DEBUG ((DEBUG_INFO, "Delayed dispatch on %g. Count=%d, DispatchCount=%d\n", UniqueId, DelayedDispatchTable->Count, DelayedDispatchTable->DispCount));
+ PERF_EVENT_SIGNAL_BEGIN (UniqueId);
+ DelayedDispatchDispatcher (DelayedDispatchTable, UniqueId);
+ PERF_EVENT_SIGNAL_END (UniqueId);
+
+ PERF_FUNCTION_END ();
+ return EFI_SUCCESS;
+}
+
/**
+ DelayedDispatch End of PEI callback function. Insure that all of the delayed dispatch
+ entries are complete before exiting PEI.
+ @param[in] PeiServices - Pointer to PEI Services Table.
+ @param[in] NotifyDesc - Pointer to the descriptor for the Notification event that
+ caused this function to execute.
+ @param[in] Ppi - Pointer to the PPI data associated with this function.
+
+ @retval EFI_STATUS - Always return EFI_SUCCESS
+**/
+EFI_STATUS
+EFIAPI
+PeiDelayedDispatchOnEndOfPei (
+ IN EFI_PEI_SERVICES **PeiServices,
+ IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDesc,
+ IN VOID *Ppi
+ )
+{
+ DELAYED_DISPATCH_TABLE *DelayedDispatchTable;
+
+ // Get delayed dispatch table
+ DelayedDispatchTable = GetDelayedDispatchTable ();
+ if (NULL == DelayedDispatchTable) {
+ return EFI_UNSUPPORTED;
+ }
+
+ PERF_INMODULE_BEGIN ("PerfDelayedDispatchEndOfPei");
+ while (DelayedDispatchTable->Count > 0) {
+ DelayedDispatchDispatcher (DelayedDispatchTable, NULL);
+ }
+
+ DEBUG ((DEBUG_ERROR, "%a Count of dispatch cycles is %d\n", __func__, DelayedDispatchTable->DispCount));
+ PERF_INMODULE_END ("PerfDelayedDispatchEndOfPei");
+
+ return EFI_SUCCESS;
+}
+
+/**
Discover all PEIMs and optional Apriori file in one FV. There is at most one
Apriori file in one FV.
@@ -1365,12 +1705,31 @@ PeiDispatcher (
EFI_PEI_FILE_HANDLE SaveCurrentFileHandle;
EFI_FV_FILE_INFO FvFileInfo;
PEI_CORE_FV_HANDLE *CoreFvHandle;
+ EFI_HOB_GUID_TYPE *GuidHob;
+ UINT32 TableSize;
PeiServices = (CONST EFI_PEI_SERVICES **)&Private->Ps;
PeimEntryPoint = NULL;
PeimFileHandle = NULL;
EntryPoint = 0;
+ if (NULL == Private->DelayedDispatchTable) {
+ GuidHob = GetFirstGuidHob (&gEfiDelayedDispatchTableGuid);
+ if (NULL != GuidHob) {
+ Private->DelayedDispatchTable = (DELAYED_DISPATCH_TABLE *)(GET_GUID_HOB_DATA (GuidHob));
+ } else {
+ TableSize = sizeof (DELAYED_DISPATCH_TABLE) + ((DELAYED_DISPATCH_MAX_ENTRIES - 1) * sizeof (DELAYED_DISPATCH_ENTRY));
+ Private->DelayedDispatchTable = BuildGuidHob (&gEfiDelayedDispatchTableGuid, TableSize);
+ if (NULL != Private->DelayedDispatchTable) {
+ ZeroMem (Private->DelayedDispatchTable, TableSize);
+ Status = PeiServicesInstallPpi (&mDelayedDispatchDesc);
+ ASSERT_EFI_ERROR (Status);
+ Status = PeiServicesNotifyPpi (&mDelayedDispatchNotifyDesc);
+ ASSERT_EFI_ERROR (Status);
+ }
+ }
+ }
+
if ((Private->PeiMemoryInstalled) &&
(PcdGetBool (PcdMigrateTemporaryRamFirmwareVolumes) ||
(Private->HobList.HandoffInformationTable->BootMode != BOOT_ON_S3_RESUME) ||
@@ -1621,6 +1980,13 @@ PeiDispatcher (
}
}
}
+
+ // Dispatch pending delalyed dispatch requests
+ if (NULL != Private->DelayedDispatchTable) {
+ if (DelayedDispatchDispatcher (Private->DelayedDispatchTable, NULL)) {
+ ProcessDispatchNotifyList (Private);
+ }
+ }
}
//
diff --git a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
index bf1719d7941a..e5643adf7027 100644
--- a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
+++ b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
@@ -277,6 +277,9 @@ PeiCore (
OldCoreData->TempFileHandles = (EFI_PEI_FILE_HANDLE *)((UINT8 *)OldCoreData->TempFileHandles - OldCoreData->HeapOffset);
}
+ // Force relocating the dispatch table
+ OldCoreData->DelayedDispatchTable = NULL;
+
//
// Fixup for PeiService's address
//
diff --git a/MdeModulePkg/Core/Pei/PeiMain.h b/MdeModulePkg/Core/Pei/PeiMain.h
index 556beddad533..542b680c099c 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.h
+++ b/MdeModulePkg/Core/Pei/PeiMain.h
@@ -11,6 +11,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include <PiPei.h>
#include <Ppi/DxeIpl.h>
+#include <Ppi/DelayedDispatch.h>
+#include <Ppi/EndOfPeiPhase.h>
#include <Ppi/MemoryDiscovered.h>
#include <Ppi/StatusCode.h>
#include <Ppi/Reset.h>
@@ -41,6 +43,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include <IndustryStandard/PeImage.h>
#include <Library/PeiServicesTablePointerLib.h>
#include <Library/MemoryAllocationLib.h>
+#include <Library/TimerLib.h>
#include <Guid/FirmwareFileSystem2.h>
#include <Guid/FirmwareFileSystem3.h>
#include <Guid/AprioriFileName.h>
@@ -207,6 +210,29 @@ EFI_STATUS
#define PEI_CORE_HANDLE_SIGNATURE SIGNATURE_32('P','e','i','C')
+#define GET_TIME_IN_US() ((UINT32)DivU64x32(GetTimeInNanoSecond(GetPerformanceCounter ()), 1000))
+
+//
+// Internal structure for delayed dispatch entries.
+//
+#pragma pack (push, 1)
+
+typedef struct {
+ EFI_GUID UniqueId;
+ UINT64 Context;
+ EFI_DELAYED_DISPATCH_FUNCTION Function;
+ UINT32 DispatchTime;
+ UINT32 MicrosecondDelay;
+} DELAYED_DISPATCH_ENTRY;
+
+typedef struct {
+ UINT32 Count;
+ UINT32 DispCount;
+ DELAYED_DISPATCH_ENTRY Entry[1]; // Actual size based on usage, and cannot exceed DELAYED_DISPATCH_MAX_ENTRIES;
+} DELAYED_DISPATCH_TABLE;
+
+#pragma pack (pop)
+
///
/// Pei Core private data structure instance
///
@@ -307,6 +333,11 @@ struct _PEI_CORE_INSTANCE {
// Those Memory Range will be migrated into physical memory.
//
HOLE_MEMORY_DATA HoleData[HOLE_MAX_NUMBER];
+
+ //
+ // Table of delayed dispatch requests
+ //
+ DELAYED_DISPATCH_TABLE *DelayedDispatchTable;
};
///
@@ -2038,4 +2069,49 @@ PeiReinitializeFv (
IN PEI_CORE_INSTANCE *PrivateData
);
+/**
+Register a callback to be called after a minimum delay has occurred.
+
+This service is the single member function of the EFI_DELAYED_DISPATCH_PPI
+
+ @param[in] This Pointer to the EFI_DELAYED_DISPATCH_PPI instance
+ @param[in] Function Function to call back
+ @param[in] Context Context data
+ @param[in] UniqueId GUID for this Delayed Dispatch request.
+ @param[in] Delay Delay interval
+
+ @retval EFI_SUCCESS Function successfully loaded
+ @retval EFI_INVALID_PARAMETER One of the Arguments is not supported
+ @retval EFI_OUT_OF_RESOURCES No more entries
+
+**/
+EFI_STATUS
+EFIAPI
+PeiDelayedDispatchRegister (
+ IN EFI_DELAYED_DISPATCH_PPI *This,
+ IN EFI_DELAYED_DISPATCH_FUNCTION Function,
+ IN UINT64 Context,
+ IN EFI_GUID *UniqueId OPTIONAL,
+ IN UINT32 Delay
+ );
+
+/**
+ Wait on a registered Delayed Dispatch unit that has a UniqueId. Continue
+ to dispatch all registered delayed dispatch entries until *ALL* entries with
+ UniqueId have completed.
+
+ @param[in] This The Delayed Dispatch PPI pointer.
+ @param[in] UniqueId UniqueId of delayed dispatch entry.
+
+ @retval EFI_SUCCESS The operation succeeds.
+ @retval EFI_INVALID_PARAMETER The parameters are invalid.
+
+**/
+EFI_STATUS
+EFIAPI
+PeiDelayedDispatchWaitOnUniqueId (
+ IN EFI_DELAYED_DISPATCH_PPI *This,
+ IN EFI_GUID *UniqueId
+ );
+
#endif
diff --git a/MdeModulePkg/Core/Pei/PeiMain.inf b/MdeModulePkg/Core/Pei/PeiMain.inf
index 0cf357371a16..b2c1e53949de 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.inf
+++ b/MdeModulePkg/Core/Pei/PeiMain.inf
@@ -66,6 +66,7 @@ [LibraryClasses]
PeCoffLib
PeiServicesTablePointerLib
PcdLib
+ TimerLib
[Guids]
gPeiAprioriFileNameGuid ## SOMETIMES_CONSUMES ## File
@@ -100,6 +101,8 @@ [Ppis]
gEfiPeiReset2PpiGuid ## SOMETIMES_CONSUMES
gEfiSecHobDataPpiGuid ## SOMETIMES_CONSUMES
gEfiPeiCoreFvLocationPpiGuid ## SOMETIMES_CONSUMES
+ gEfiPeiDelayedDispatchPpiGuid ## PRODUCES
+ gEfiEndOfPeiSignalPpiGuid ## CONSUMES
[Pcd]
gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreMaxPeiStackSize ## CONSUMES
@@ -112,6 +115,8 @@ [Pcd]
gEfiMdeModulePkgTokenSpaceGuid.PcdShadowPeimOnBoot ## CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack ## CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdMigrateTemporaryRamFirmwareVolumes ## CONSUMES
+ gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs ## CONSUMES
+ gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeoutUs ## CONSUMES
# [BootMode]
# S3_RESUME ## SOMETIMES_CONSUMES
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index dd182c02fdf6..cb49ef50b864 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -994,6 +994,14 @@ [PcdsFixedAtBuild]
# @ValidList 0x80000006 | 0x03058002
gEfiMdeModulePkgTokenSpaceGuid.PcdErrorCodeSetVariable|0x03058002|UINT32|0x30001040
+ ## Delayed Dispatch Maximum Delay in us (microseconds)
+ # Maximum delay for any particular delay request - 5 seconds
+ gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs|5000000|UINT32|0x3000104A
+
+ ## Delayed Dispatch timeout in us (microseconds)
+ # Maximum delay when waiting for completion (ie EndOfPei) - 10 seconds
+ gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeoutUs|10000000|UINT32|0x3000104B
+
## Mask to control the NULL address detection in code for different phases.
# If enabled, accessing NULL address in UEFI or SMM code can be caught.<BR><BR>
# BIT0 - Enable NULL pointer detection for UEFI.<BR>
--
2.42.0.windows.2
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