Re: [PATCH 4/7] MdeModulePkg PeiCore: Remove the using of PcdPeiCoreMaxPpiSupported

["Chiu, Chasel" <chasel.chiu@intel.com>]

Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>


-----Original Message-----
From: Zeng, Star 
Sent: Friday, December 14, 2018 6:29 PM
To: edk2-devel@lists.01.org
Cc: Zeng, Star <star.zeng@intel.com>; Wang, Jian J <jian.j.wang@intel.com>; Wu, Hao A <hao.a.wu@intel.com>; Gao, Liming <liming.gao@intel.com>; Ni, Ruiyu <ruiyu.ni@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>; Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>; Chiu, Chasel <chasel.chiu@intel.com>
Subject: [PATCH 4/7] MdeModulePkg PeiCore: Remove the using of PcdPeiCoreMaxPpiSupported

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1405

Background as below.

Problem:
As static configuration from the PCDs, the binary PeiCore (for example in FSP binary with dispatch mode) could not predict how many FVs, Files or PPIs for different platforms.

Burden:
Platform developers need configure the PCDs accordingly for different platforms.

To solve the problem and remove the burden, we can update code to remove the using of PcdPeiCoreMaxFvSupported, PcdPeiCoreMaxPeimPerFv and PcdPeiCoreMaxPpiSupported by extending buffer dynamically for FV, File and PPI management.

This patch removes the using of PcdPeiCoreMaxPpiSupported in PeiCore.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
---
 MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c |   8 +-
 MdeModulePkg/Core/Pei/PeiMain.h               |  59 +++--
 MdeModulePkg/Core/Pei/PeiMain.inf             |   1 -
 MdeModulePkg/Core/Pei/PeiMain/PeiMain.c       |  30 ++-
 MdeModulePkg/Core/Pei/Ppi/Ppi.c               | 355 ++++++++++++++------------
 5 files changed, 254 insertions(+), 199 deletions(-)

diff --git a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
index 71440bab9488..55a300adbdb8 100644
--- a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
+++ b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
@@ -1062,7 +1062,7 @@ PeiDispatcher (
           // Process the Notify list and dispatch any notifies for
           // newly installed PPIs.
           //
-          ProcessNotifyList (Private);
+          ProcessDispatchNotifyList (Private);
         }
       }
     }
@@ -1209,10 +1209,10 @@ PeiDispatcher (
             // Process the Notify list and dispatch any notifies for
             // newly installed PPIs.
             //
-            ProcessNotifyList (Private);
+            ProcessDispatchNotifyList (Private);
 
             //
-            // Recheck SwitchStackSignal after ProcessNotifyList()
+            // Recheck SwitchStackSignal after 
+ ProcessDispatchNotifyList()
             // in case PeiInstallPeiMemory() is done in a callback with
             // EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH.
             //
@@ -1253,7 +1253,7 @@ PeiDispatcher (
               // Process the Notify list and dispatch any notifies for
               // newly installed PPIs.
               //
-              ProcessNotifyList (Private);
+              ProcessDispatchNotifyList (Private);
             }
           }
         }
diff --git a/MdeModulePkg/Core/Pei/PeiMain.h b/MdeModulePkg/Core/Pei/PeiMain.h index b248118087ad..c6c932c3e233 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.h
+++ b/MdeModulePkg/Core/Pei/PeiMain.h
@@ -66,37 +66,60 @@ typedef union {
 } PEI_PPI_LIST_POINTERS;
 
 ///
-/// PPI database structure which contains two link: PpiList and NotifyList. PpiList -/// is in head of PpiListPtrs array and notify is in end of PpiListPtrs.
+/// Number of PEI_PPI_LIST_POINTERS to grow by each time we run out of 
+room
 ///
+#define PPI_GROWTH_STEP             64
+#define CALLBACK_NOTIFY_GROWTH_STEP 32
+#define DISPATCH_NOTIFY_GROWTH_STEP 8
+
 typedef struct {
+  UINTN                 CurrentCount;
+  UINTN                 MaxCount;
+  UINTN                 LastDispatchedCount;
   ///
-  /// index of end of PpiList link list.
+  /// MaxCount number of entries.
   ///
-  INTN                    PpiListEnd;
+  PEI_PPI_LIST_POINTERS *PpiPtrs;
+} PEI_PPI_LIST;
+
+typedef struct {
+  UINTN                 CurrentCount;
+  UINTN                 MaxCount;
   ///
-  /// index of end of notify link list.
+  /// MaxCount number of entries.
   ///
-  INTN                    NotifyListEnd;
+  PEI_PPI_LIST_POINTERS *NotifyPtrs;
+} PEI_CALLBACK_NOTIFY_LIST;
+
+typedef struct {
+  UINTN                 CurrentCount;
+  UINTN                 MaxCount;
+  UINTN                 LastDispatchedCount;
   ///
-  /// index of the dispatched notify list.
+  /// MaxCount number of entries.
   ///
-  INTN                    DispatchListEnd;
+  PEI_PPI_LIST_POINTERS *NotifyPtrs;
+} PEI_DISPATCH_NOTIFY_LIST;
+
+///
+/// PPI database structure which contains three links:
+/// PpiList, CallbackNotifyList and DispatchNotifyList.
+///
+typedef struct {
   ///
-  /// index of last installed Ppi description in PpiList link list.
+  /// PPI List.
   ///
-  INTN                    LastDispatchedInstall;
+  PEI_PPI_LIST              PpiList;
   ///
-  /// index of last dispatched notify in Notify link list.
+  /// Notify List at dispatch level.
   ///
-  INTN                    LastDispatchedNotify;
+  PEI_CALLBACK_NOTIFY_LIST  CallbackNotifyList;
   ///
-  /// Ppi database has the PcdPeiCoreMaxPpiSupported number of entries.
+  /// Notify List at callback level.
   ///
-  PEI_PPI_LIST_POINTERS   *PpiListPtrs;
+  PEI_DISPATCH_NOTIFY_LIST  DispatchNotifyList;
 } PEI_PPI_DATABASE;
 
-
 //
 // PEI_CORE_FV_HANDE.PeimState
 // Do not change these values as there is code doing math to change states.
@@ -550,13 +573,13 @@ PeiNotifyPpi (
 
 **/
 VOID
-ProcessNotifyList (
+ProcessDispatchNotifyList (
   IN PEI_CORE_INSTANCE  *PrivateData
   );
 
 /**
 
-  Dispatch notifications.
+  Process notifications.
 
   @param PrivateData        PeiCore's private data structure
   @param NotifyType         Type of notify to fire.
@@ -567,7 +590,7 @@ ProcessNotifyList (
 
 **/
 VOID
-DispatchNotify (
+ProcessNotify (
   IN PEI_CORE_INSTANCE  *PrivateData,
   IN UINTN               NotifyType,
   IN INTN                InstallStartIndex,
diff --git a/MdeModulePkg/Core/Pei/PeiMain.inf b/MdeModulePkg/Core/Pei/PeiMain.inf
index dd41fe41bc89..140c4444b107 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.inf
+++ b/MdeModulePkg/Core/Pei/PeiMain.inf
@@ -104,7 +104,6 @@ [Ppis]
   gEfiSecHobDataPpiGuid                         ## SOMETIMES_CONSUMES
 
 [Pcd]
-  gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreMaxPpiSupported                  ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreMaxPeiStackSize                  ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreImageLoaderSearchTeSectionFirst  ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdFrameworkCompatibilitySupport           ## CONSUMES
diff --git a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
index 4869bf18f005..4da80a8222bc 100644
--- a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
+++ b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
@@ -190,7 +190,15 @@ PeiCore (
         if (OldCoreData->CurrentFvFileHandles != NULL) {
           OldCoreData->CurrentFvFileHandles = (EFI_PEI_FILE_HANDLE *) ((UINT8 *) OldCoreData->CurrentFvFileHandles + OldCoreData->HeapOffset);
         }
-        OldCoreData->PpiData.PpiListPtrs  = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.PpiListPtrs + OldCoreData->HeapOffset);
+        if (OldCoreData->PpiData.PpiList.PpiPtrs != NULL) {
+          OldCoreData->PpiData.PpiList.PpiPtrs = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.PpiList.PpiPtrs + OldCoreData->HeapOffset);
+        }
+        if (OldCoreData->PpiData.CallbackNotifyList.NotifyPtrs != NULL) {
+          OldCoreData->PpiData.CallbackNotifyList.NotifyPtrs = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.CallbackNotifyList.NotifyPtrs + OldCoreData->HeapOffset);
+        }
+        if (OldCoreData->PpiData.DispatchNotifyList.NotifyPtrs != NULL) {
+          OldCoreData->PpiData.DispatchNotifyList.NotifyPtrs = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.DispatchNotifyList.NotifyPtrs + OldCoreData->HeapOffset);
+        }
         OldCoreData->Fv                   = (PEI_CORE_FV_HANDLE *) ((UINT8 *) OldCoreData->Fv + OldCoreData->HeapOffset);
         for (Index = 0; Index < OldCoreData->FvCount; Index ++) {
           if (OldCoreData->Fv[Index].PeimState != NULL) { @@ -210,7 +218,15 @@ PeiCore (
         if (OldCoreData->CurrentFvFileHandles != NULL) {
           OldCoreData->CurrentFvFileHandles = (EFI_PEI_FILE_HANDLE *) ((UINT8 *) OldCoreData->CurrentFvFileHandles - OldCoreData->HeapOffset);
         }
-        OldCoreData->PpiData.PpiListPtrs  = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.PpiListPtrs - OldCoreData->HeapOffset);
+        if (OldCoreData->PpiData.PpiList.PpiPtrs != NULL) {
+          OldCoreData->PpiData.PpiList.PpiPtrs = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.PpiList.PpiPtrs - OldCoreData->HeapOffset);
+        }
+        if (OldCoreData->PpiData.CallbackNotifyList.NotifyPtrs != NULL) {
+          OldCoreData->PpiData.CallbackNotifyList.NotifyPtrs = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.CallbackNotifyList.NotifyPtrs - OldCoreData->HeapOffset);
+        }
+        if (OldCoreData->PpiData.DispatchNotifyList.NotifyPtrs != NULL) {
+          OldCoreData->PpiData.DispatchNotifyList.NotifyPtrs = (PEI_PPI_LIST_POINTERS *) ((UINT8 *) OldCoreData->PpiData.DispatchNotifyList.NotifyPtrs - OldCoreData->HeapOffset);
+        }
         OldCoreData->Fv                   = (PEI_CORE_FV_HANDLE *) ((UINT8 *) OldCoreData->Fv - OldCoreData->HeapOffset);
         for (Index = 0; Index < OldCoreData->FvCount; Index ++) {
           if (OldCoreData->Fv[Index].PeimState != NULL) { @@ -337,14 +353,6 @@ PeiCore (
   // Initialize PEI Core Services
   //
   InitializeMemoryServices   (&PrivateData, SecCoreData, OldCoreData);
-  if (OldCoreData == NULL) {
-    //
-    // Initialize PEI Core Private Data Buffer
-    //
-    PrivateData.PpiData.PpiListPtrs  = AllocateZeroPool (sizeof (PEI_PPI_LIST_POINTERS) * PcdGet32 (PcdPeiCoreMaxPpiSupported));
-    ASSERT (PrivateData.PpiData.PpiListPtrs != NULL);
-  }
-  InitializePpiServices      (&PrivateData,    OldCoreData);
 
   //
   // Update performance measurements
@@ -414,7 +422,7 @@ PeiCore (
     //
     // Process the Notify list and dispatch any notifies for the Memory Discovered PPI
     //
-    ProcessNotifyList (&PrivateData);
+    ProcessDispatchNotifyList (&PrivateData);
 
     PERF_INMODULE_END ("DisMem");
   }
diff --git a/MdeModulePkg/Core/Pei/Ppi/Ppi.c b/MdeModulePkg/Core/Pei/Ppi/Ppi.c index 6f03858b8a94..907b2bbcf466 100644
--- a/MdeModulePkg/Core/Pei/Ppi/Ppi.c
+++ b/MdeModulePkg/Core/Pei/Ppi/Ppi.c
@@ -16,28 +16,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 /**
 
-  Initialize PPI services.
-
-  @param PrivateData     Pointer to the PEI Core data.
-  @param OldCoreData     Pointer to old PEI Core data.
-                         NULL if being run in non-permament memory mode.
-
-**/
-VOID
-InitializePpiServices (
-  IN PEI_CORE_INSTANCE *PrivateData,
-  IN PEI_CORE_INSTANCE *OldCoreData
-  )
-{
-  if (OldCoreData == NULL) {
-    PrivateData->PpiData.NotifyListEnd = PcdGet32 (PcdPeiCoreMaxPpiSupported)-1;
-    PrivateData->PpiData.DispatchListEnd = PcdGet32 (PcdPeiCoreMaxPpiSupported)-1;
-    PrivateData->PpiData.LastDispatchedNotify = PcdGet32 (PcdPeiCoreMaxPpiSupported)-1;
-  }
-}
-
-/**
-
   Migrate Pointer from the temporary memory to PEI installed memory.
 
   @param Pointer         Pointer to the Pointer needs to be converted.
@@ -192,14 +170,37 @@ ConvertPpiPointers (  {
   UINT8                 Index;
 
-  for (Index = 0; Index < PcdGet32 (PcdPeiCoreMaxPpiSupported); Index++) {
-    if (Index < PrivateData->PpiData.PpiListEnd || Index > PrivateData->PpiData.NotifyListEnd) {
-      ConvertSinglePpiPointer (
-        SecCoreData,
-        PrivateData,
-        &PrivateData->PpiData.PpiListPtrs[Index]
-        );
-    }
+  //
+  // Convert normal PPIs.
+  //
+  for (Index = 0; Index < PrivateData->PpiData.PpiList.CurrentCount; Index++) {
+    ConvertSinglePpiPointer (
+      SecCoreData,
+      PrivateData,
+      &PrivateData->PpiData.PpiList.PpiPtrs[Index]
+      );
+  }
+
+  //
+  // Convert Callback Notification PPIs.
+  //
+  for (Index = 0; Index < PrivateData->PpiData.CallbackNotifyList.CurrentCount; Index++) {
+    ConvertSinglePpiPointer (
+      SecCoreData,
+      PrivateData,
+      &PrivateData->PpiData.CallbackNotifyList.NotifyPtrs[Index]
+      );
+  }
+
+  //
+  // Convert Dispatch Notification PPIs.
+  //
+  for (Index = 0; Index < PrivateData->PpiData.DispatchNotifyList.CurrentCount; Index++) {
+    ConvertSinglePpiPointer (
+      SecCoreData,
+      PrivateData,
+      &PrivateData->PpiData.DispatchNotifyList.NotifyPtrs[Index]
+      );
   }
 }
 
@@ -228,10 +229,11 @@ InternalPeiInstallPpi (
   IN BOOLEAN                       Single
   )
 {
-  PEI_CORE_INSTANCE *PrivateData;
-  INTN              Index;
-  INTN              LastCallbackInstall;
-
+  PEI_CORE_INSTANCE     *PrivateData;
+  PEI_PPI_LIST          *PpiListPointer;
+  UINTN                 Index;
+  UINTN                 LastCount;
+  VOID                  *TempPtr;
 
   if (PpiList == NULL) {
     return EFI_INVALID_PARAMETER;
@@ -239,8 +241,9 @@ InternalPeiInstallPpi (
 
   PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);
 
-  Index = PrivateData->PpiData.PpiListEnd;
-  LastCallbackInstall = Index;
+  PpiListPointer = &PrivateData->PpiData.PpiList;  Index = 
+ PpiListPointer->CurrentCount;  LastCount = Index;
 
   //
   // This is loop installs all PPI descriptors in the PpiList.  It is terminated @@ -250,27 +253,37 @@ InternalPeiInstallPpi (
 
   for (;;) {
     //
-    // Since PpiData is used for NotifyList and PpiList, max resource
-    // is reached if the Install reaches the NotifyList
-    // PcdPeiCoreMaxPpiSupported can be set to a larger value in DSC to satisfy more PPI requirement.
-    //
-    if (Index == PrivateData->PpiData.NotifyListEnd + 1) {
-      return  EFI_OUT_OF_RESOURCES;
-    }
-    //
     // Check if it is a valid PPI.
     // If not, rollback list to exclude all in this list.
     // Try to indicate which item failed.
     //
     if ((PpiList->Flags & EFI_PEI_PPI_DESCRIPTOR_PPI) == 0) {
-      PrivateData->PpiData.PpiListEnd = LastCallbackInstall;
+      PpiListPointer->CurrentCount = LastCount;
       DEBUG((EFI_D_ERROR, "ERROR -> InstallPpi: %g %p\n", PpiList->Guid, PpiList->Ppi));
       return  EFI_INVALID_PARAMETER;
     }
 
+    if (Index == PpiListPointer->MaxCount) {
+      //
+      // Run out of room, grow the buffer.
+      //
+      TempPtr = AllocateZeroPool (
+                  sizeof (PEI_PPI_LIST_POINTERS) * (PpiListPointer->MaxCount + PPI_GROWTH_STEP)
+                  );
+      ASSERT (TempPtr != NULL);
+      CopyMem (
+        TempPtr,
+        PpiListPointer->PpiPtrs,
+        sizeof (PEI_PPI_LIST_POINTERS) * PpiListPointer->MaxCount
+        );
+      PpiListPointer->PpiPtrs = TempPtr;
+      PpiListPointer->MaxCount = PpiListPointer->MaxCount + PPI_GROWTH_STEP;
+    }
+
     DEBUG((EFI_D_INFO, "Install PPI: %g\n", PpiList->Guid));
-    PrivateData->PpiData.PpiListPtrs[Index].Ppi = (EFI_PEI_PPI_DESCRIPTOR*) PpiList;
-    PrivateData->PpiData.PpiListEnd++;
+    PpiListPointer->PpiPtrs[Index].Ppi = (EFI_PEI_PPI_DESCRIPTOR *) PpiList;
+    Index++;
+    PpiListPointer->CurrentCount++;
 
     if (Single) {
       //
@@ -284,23 +297,24 @@ InternalPeiInstallPpi (
       //
       break;
     }
+    //
+    // Go to the next descriptor.
+    //
     PpiList++;
-    Index++;
   }
 
   //
-  // Dispatch any callback level notifies for newly installed PPIs.
+  // Process any callback level notifies for newly installed PPIs.
   //
-  DispatchNotify (
+  ProcessNotify (
     PrivateData,
     EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,
-    LastCallbackInstall,
-    PrivateData->PpiData.PpiListEnd,
-    PrivateData->PpiData.DispatchListEnd,
-    PrivateData->PpiData.NotifyListEnd
+    LastCount,
+    PpiListPointer->CurrentCount,
+    0,
+    PrivateData->PpiData.CallbackNotifyList.CurrentCount
     );
 
-
   return EFI_SUCCESS;
 }
 
@@ -355,7 +369,7 @@ PeiReInstallPpi (
   )
 {
   PEI_CORE_INSTANCE   *PrivateData;
-  INTN                Index;
+  UINTN               Index;
 
 
   if ((OldPpi == NULL) || (NewPpi == NULL)) { @@ -372,35 +386,33 @@ PeiReInstallPpi (
   // Find the old PPI instance in the database.  If we can not find it,
   // return the EFI_NOT_FOUND error.
   //
-  for (Index = 0; Index < PrivateData->PpiData.PpiListEnd; Index++) {
-    if (OldPpi == PrivateData->PpiData.PpiListPtrs[Index].Ppi) {
+  for (Index = 0; Index < PrivateData->PpiData.PpiList.CurrentCount; Index++) {
+    if (OldPpi == PrivateData->PpiData.PpiList.PpiPtrs[Index].Ppi) {
       break;
     }
   }
-  if (Index == PrivateData->PpiData.PpiListEnd) {
+  if (Index == PrivateData->PpiData.PpiList.CurrentCount) {
     return EFI_NOT_FOUND;
   }
 
   //
-  // Remove the old PPI from the database, add the new one.
+  // Replace the old PPI with the new one.
   //
   DEBUG((EFI_D_INFO, "Reinstall PPI: %g\n", NewPpi->Guid));
-  ASSERT (Index < (INTN)(PcdGet32 (PcdPeiCoreMaxPpiSupported)));
-  PrivateData->PpiData.PpiListPtrs[Index].Ppi = (EFI_PEI_PPI_DESCRIPTOR *) NewPpi;
+  PrivateData->PpiData.PpiList.PpiPtrs[Index].Ppi = 
+ (EFI_PEI_PPI_DESCRIPTOR *) NewPpi;
 
   //
-  // Dispatch any callback level notifies for the newly installed PPI.
+  // Process any callback level notifies for the newly installed PPI.
   //
-  DispatchNotify (
+  ProcessNotify (
     PrivateData,
     EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,
     Index,
     Index+1,
-    PrivateData->PpiData.DispatchListEnd,
-    PrivateData->PpiData.NotifyListEnd
+    0,
+    PrivateData->PpiData.CallbackNotifyList.CurrentCount
     );
 
-
   return EFI_SUCCESS;
 }
 
@@ -430,10 +442,10 @@ PeiLocatePpi (
   IN OUT VOID                      **Ppi
   )
 {
-  PEI_CORE_INSTANCE   *PrivateData;
-  INTN                Index;
-  EFI_GUID            *CheckGuid;
-  EFI_PEI_PPI_DESCRIPTOR  *TempPtr;
+  PEI_CORE_INSTANCE         *PrivateData;
+  UINTN                     Index;
+  EFI_GUID                  *CheckGuid;
+  EFI_PEI_PPI_DESCRIPTOR    *TempPtr;
 
 
   PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);
@@ -441,8 +453,8 @@ PeiLocatePpi (
   //
   // Search the data base for the matching instance of the GUIDed PPI.
   //
-  for (Index = 0; Index < PrivateData->PpiData.PpiListEnd; Index++) {
-    TempPtr = PrivateData->PpiData.PpiListPtrs[Index].Ppi;
+  for (Index = 0; Index < PrivateData->PpiData.PpiList.CurrentCount; Index++) {
+    TempPtr = PrivateData->PpiData.PpiList.PpiPtrs[Index].Ppi;
     CheckGuid = TempPtr->Guid;
 
     //
@@ -498,15 +510,14 @@ InternalPeiNotifyPpi (
   IN BOOLEAN                          Single
   )
 {
-  PEI_CORE_INSTANCE                *PrivateData;
-  INTN                             Index;
-  INTN                             NotifyIndex;
-  INTN                             LastCallbackNotify;
-  EFI_PEI_NOTIFY_DESCRIPTOR        *NotifyPtr;
-  UINTN                            NotifyDispatchCount;
-
-
-  NotifyDispatchCount = 0;
+  PEI_CORE_INSTANCE         *PrivateData;
+  PEI_CALLBACK_NOTIFY_LIST  *CallbackNotifyListPointer;
+  UINTN                     CallbackNotifyIndex;
+  UINTN                     LastCallbackNotifyCount;
+  PEI_DISPATCH_NOTIFY_LIST  *DispatchNotifyListPointer;
+  UINTN                     DispatchNotifyIndex;
+  UINTN                     LastDispatchNotifyCount;
+  VOID                      *TempPtr;
 
   if (NotifyList == NULL) {
     return EFI_INVALID_PARAMETER;
@@ -514,8 +525,13 @@ InternalPeiNotifyPpi (
 
   PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);
 
-  Index = PrivateData->PpiData.NotifyListEnd;
-  LastCallbackNotify = Index;
+  CallbackNotifyListPointer = &PrivateData->PpiData.CallbackNotifyList;
+  CallbackNotifyIndex = CallbackNotifyListPointer->CurrentCount;
+  LastCallbackNotifyCount = CallbackNotifyIndex;
+
+  DispatchNotifyListPointer = &PrivateData->PpiData.DispatchNotifyList;
+  DispatchNotifyIndex = DispatchNotifyListPointer->CurrentCount;
+  LastDispatchNotifyCount = DispatchNotifyIndex;
 
   //
   // This is loop installs all Notify descriptors in the NotifyList.  It is @@ -525,31 +541,59 @@ InternalPeiNotifyPpi (
 
   for (;;) {
     //
-    // Since PpiData is used for NotifyList and InstallList, max resource
-    // is reached if the Install reaches the PpiList
-    // PcdPeiCoreMaxPpiSupported can be set to a larger value in DSC to satisfy more Notify PPIs requirement.
-    //
-    if (Index == PrivateData->PpiData.PpiListEnd - 1) {
-      return  EFI_OUT_OF_RESOURCES;
-    }
-
-    //
     // If some of the PPI data is invalid restore original Notify PPI database value
     //
     if ((NotifyList->Flags & EFI_PEI_PPI_DESCRIPTOR_NOTIFY_TYPES) == 0) {
-        PrivateData->PpiData.NotifyListEnd = LastCallbackNotify;
-        DEBUG((EFI_D_ERROR, "ERROR -> InstallNotify: %g %p\n", NotifyList->Guid, NotifyList->Notify));
+        CallbackNotifyListPointer->CurrentCount = LastCallbackNotifyCount;
+        DispatchNotifyListPointer->CurrentCount = LastDispatchNotifyCount;
+        DEBUG((EFI_D_ERROR, "ERROR -> NotifyPpi: %g %p\n", 
+ NotifyList->Guid, NotifyList->Notify));
       return  EFI_INVALID_PARAMETER;
     }
 
-    if ((NotifyList->Flags & EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH) != 0) {
-      NotifyDispatchCount ++;
+    if ((NotifyList->Flags & EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK) != 0) {
+      if (CallbackNotifyIndex == CallbackNotifyListPointer->MaxCount) {
+        //
+        // Run out of room, grow the buffer.
+        //
+        TempPtr = AllocateZeroPool (
+                    sizeof (PEI_PPI_LIST_POINTERS) * (CallbackNotifyListPointer->MaxCount + CALLBACK_NOTIFY_GROWTH_STEP)
+                    );
+        ASSERT (TempPtr != NULL);
+        CopyMem (
+          TempPtr,
+          CallbackNotifyListPointer->NotifyPtrs,
+          sizeof (PEI_PPI_LIST_POINTERS) * CallbackNotifyListPointer->MaxCount
+          );
+        CallbackNotifyListPointer->NotifyPtrs = TempPtr;
+        CallbackNotifyListPointer->MaxCount = CallbackNotifyListPointer->MaxCount + CALLBACK_NOTIFY_GROWTH_STEP;
+      }
+      CallbackNotifyListPointer->NotifyPtrs[CallbackNotifyIndex].Notify = (EFI_PEI_NOTIFY_DESCRIPTOR *) NotifyList;
+      CallbackNotifyIndex++;
+      CallbackNotifyListPointer->CurrentCount++;
+    } else {
+      if (DispatchNotifyIndex == DispatchNotifyListPointer->MaxCount) {
+        //
+        // Run out of room, grow the buffer.
+        //
+        TempPtr = AllocateZeroPool (
+                    sizeof (PEI_PPI_LIST_POINTERS) * (DispatchNotifyListPointer->MaxCount + DISPATCH_NOTIFY_GROWTH_STEP)
+                    );
+        ASSERT (TempPtr != NULL);
+        CopyMem (
+          TempPtr,
+          DispatchNotifyListPointer->NotifyPtrs,
+          sizeof (PEI_PPI_LIST_POINTERS) * DispatchNotifyListPointer->MaxCount
+          );
+        DispatchNotifyListPointer->NotifyPtrs = TempPtr;
+        DispatchNotifyListPointer->MaxCount = DispatchNotifyListPointer->MaxCount + DISPATCH_NOTIFY_GROWTH_STEP;
+      }
+      DispatchNotifyListPointer->NotifyPtrs[DispatchNotifyIndex].Notify = (EFI_PEI_NOTIFY_DESCRIPTOR *) NotifyList;
+      DispatchNotifyIndex++;
+      DispatchNotifyListPointer->CurrentCount++;
     }
 
-    PrivateData->PpiData.PpiListPtrs[Index].Notify = (EFI_PEI_NOTIFY_DESCRIPTOR *) NotifyList;
-
-    PrivateData->PpiData.NotifyListEnd--;
     DEBUG((EFI_D_INFO, "Register PPI Notify: %g\n", NotifyList->Guid));
+
     if (Single) {
       //
       // Only single entry in the NotifyList.
@@ -563,41 +607,21 @@ InternalPeiNotifyPpi (
       break;
     }
     //
-    // Go the next descriptor. Remember the NotifyList moves down.
+    // Go to the next descriptor.
     //
     NotifyList++;
-    Index--;
-  }
-
-  //
-  // If there is Dispatch Notify PPI installed put them on the bottom
-  //
-  if (NotifyDispatchCount > 0) {
-    for (NotifyIndex = LastCallbackNotify; NotifyIndex > PrivateData->PpiData.NotifyListEnd; NotifyIndex--) {
-      if ((PrivateData->PpiData.PpiListPtrs[NotifyIndex].Notify->Flags & EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH) != 0) {
-        NotifyPtr = PrivateData->PpiData.PpiListPtrs[NotifyIndex].Notify;
-
-        for (Index = NotifyIndex; Index < PrivateData->PpiData.DispatchListEnd; Index++){
-          PrivateData->PpiData.PpiListPtrs[Index].Notify = PrivateData->PpiData.PpiListPtrs[Index + 1].Notify;
-        }
-        PrivateData->PpiData.PpiListPtrs[Index].Notify = NotifyPtr;
-        PrivateData->PpiData.DispatchListEnd--;
-      }
-    }
-
-    LastCallbackNotify -= NotifyDispatchCount;
   }
 
   //
-  // Dispatch any callback level notifies for all previously installed PPIs.
+  // Process any callback level notifies for all previously installed PPIs.
   //
-  DispatchNotify (
+  ProcessNotify (
     PrivateData,
     EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,
     0,
-    PrivateData->PpiData.PpiListEnd,
-    LastCallbackNotify,
-    PrivateData->PpiData.NotifyListEnd
+    PrivateData->PpiData.PpiList.CurrentCount,
+    LastCallbackNotifyCount,
+    CallbackNotifyListPointer->CurrentCount
     );
 
   return  EFI_SUCCESS;
@@ -627,7 +651,6 @@ PeiNotifyPpi (
   return InternalPeiNotifyPpi (PeiServices, NotifyList, FALSE);  }
 
-
 /**
 
   Process the Notify List at dispatch level.
@@ -636,55 +659,56 @@ PeiNotifyPpi (
 
 **/
 VOID
-ProcessNotifyList (
+ProcessDispatchNotifyList (
   IN PEI_CORE_INSTANCE  *PrivateData
   )
 {
-  INTN                    TempValue;
+  UINTN                 TempValue;
 
   while (TRUE) {
     //
     // Check if the PEIM that was just dispatched resulted in any
     // Notifies getting installed.  If so, go process any dispatch
     // level Notifies that match the previouly installed PPIs.
-    // Use "while" instead of "if" since DispatchNotify can modify
-    // DispatchListEnd (with NotifyPpi) so we have to iterate until the same.
+    // Use "while" instead of "if" since ProcessNotify can modify
+    // DispatchNotifyList.CurrentCount (with NotifyPpi) so we have
+    // to iterate until the same.
     //
-    while (PrivateData->PpiData.LastDispatchedNotify != PrivateData->PpiData.DispatchListEnd) {
-      TempValue = PrivateData->PpiData.DispatchListEnd;
-      DispatchNotify (
+    while (PrivateData->PpiData.DispatchNotifyList.LastDispatchedCount != PrivateData->PpiData.DispatchNotifyList.CurrentCount) {
+      TempValue = PrivateData->PpiData.DispatchNotifyList.CurrentCount;
+      ProcessNotify (
         PrivateData,
         EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH,
         0,
-        PrivateData->PpiData.LastDispatchedInstall,
-        PrivateData->PpiData.LastDispatchedNotify,
-        PrivateData->PpiData.DispatchListEnd
+        PrivateData->PpiData.PpiList.LastDispatchedCount,
+        PrivateData->PpiData.DispatchNotifyList.LastDispatchedCount,
+        PrivateData->PpiData.DispatchNotifyList.CurrentCount
         );
-      PrivateData->PpiData.LastDispatchedNotify = TempValue;
+      PrivateData->PpiData.DispatchNotifyList.LastDispatchedCount = 
+ TempValue;
     }
 
-
     //
     // Check if the PEIM that was just dispatched resulted in any
     // PPIs getting installed.  If so, go process any dispatch
     // level Notifies that match the installed PPIs.
-    // Use "while" instead of "if" since DispatchNotify can modify
-    // PpiListEnd (with InstallPpi) so we have to iterate until the same.
+    // Use "while" instead of "if" since ProcessNotify can modify
+    // PpiList.CurrentCount (with InstallPpi) so we have to iterate
+    // until the same.
     //
-    while (PrivateData->PpiData.LastDispatchedInstall != PrivateData->PpiData.PpiListEnd) {
-      TempValue = PrivateData->PpiData.PpiListEnd;
-      DispatchNotify (
+    while (PrivateData->PpiData.PpiList.LastDispatchedCount != PrivateData->PpiData.PpiList.CurrentCount) {
+      TempValue = PrivateData->PpiData.PpiList.CurrentCount;
+      ProcessNotify (
         PrivateData,
         EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH,
-        PrivateData->PpiData.LastDispatchedInstall,
-        PrivateData->PpiData.PpiListEnd,
-        PcdGet32 (PcdPeiCoreMaxPpiSupported)-1,
-        PrivateData->PpiData.DispatchListEnd
+        PrivateData->PpiData.PpiList.LastDispatchedCount,
+        PrivateData->PpiData.PpiList.CurrentCount,
+        0,
+        PrivateData->PpiData.DispatchNotifyList.LastDispatchedCount
         );
-      PrivateData->PpiData.LastDispatchedInstall = TempValue;
+      PrivateData->PpiData.PpiList.LastDispatchedCount = TempValue;
     }
 
-    if (PrivateData->PpiData.LastDispatchedNotify == PrivateData->PpiData.DispatchListEnd) {
+    if (PrivateData->PpiData.DispatchNotifyList.LastDispatchedCount == 
+ PrivateData->PpiData.DispatchNotifyList.CurrentCount) {
       break;
     }
   }
@@ -693,7 +717,7 @@ ProcessNotifyList (
 
 /**
 
-  Dispatch notifications.
+  Process notifications.
 
   @param PrivateData        PeiCore's private data structure
   @param NotifyType         Type of notify to fire.
@@ -704,7 +728,7 @@ ProcessNotifyList (
 
 **/
 VOID
-DispatchNotify (
+ProcessNotify (
   IN PEI_CORE_INSTANCE  *PrivateData,
   IN UINTN               NotifyType,
   IN INTN                InstallStartIndex,
@@ -713,22 +737,23 @@ DispatchNotify (
   IN INTN                NotifyStopIndex
   )
 {
-  INTN                   Index1;
-  INTN                   Index2;
-  EFI_GUID                *SearchGuid;
-  EFI_GUID                *CheckGuid;
-  EFI_PEI_NOTIFY_DESCRIPTOR   *NotifyDescriptor;
-
-  //
-  // Remember that Installs moves up and Notifies moves down.
-  //
-  for (Index1 = NotifyStartIndex; Index1 > NotifyStopIndex; Index1--) {
-    NotifyDescriptor = PrivateData->PpiData.PpiListPtrs[Index1].Notify;
+  INTN                          Index1;
+  INTN                          Index2;
+  EFI_GUID                      *SearchGuid;
+  EFI_GUID                      *CheckGuid;
+  EFI_PEI_NOTIFY_DESCRIPTOR     *NotifyDescriptor;
+
+  for (Index1 = NotifyStartIndex; Index1 < NotifyStopIndex; Index1++) {
+    if (NotifyType == EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK) {
+      NotifyDescriptor = PrivateData->PpiData.CallbackNotifyList.NotifyPtrs[Index1].Notify;
+    } else {
+      NotifyDescriptor = PrivateData->PpiData.DispatchNotifyList.NotifyPtrs[Index1].Notify;
+    }
 
     CheckGuid = NotifyDescriptor->Guid;
 
     for (Index2 = InstallStartIndex; Index2 < InstallStopIndex; Index2++) {
-      SearchGuid = PrivateData->PpiData.PpiListPtrs[Index2].Ppi->Guid;
+      SearchGuid = 
+ PrivateData->PpiData.PpiList.PpiPtrs[Index2].Ppi->Guid;
       //
       // Don't use CompareGuid function here for performance reasons.
       // Instead we compare the GUID as INT32 at a time and branch @@ -745,7 +770,7 @@ DispatchNotify (
         NotifyDescriptor->Notify (
                             (EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),
                             NotifyDescriptor,
-                            (PrivateData->PpiData.PpiListPtrs[Index2].Ppi)->Ppi
+                            
+ (PrivateData->PpiData.PpiList.PpiPtrs[Index2].Ppi)->Ppi
                             );
       }
     }
--
2.7.0.windows.1