From 4784e99b74b932c40b3290e6084cb87b4e05a40b Mon Sep 17 00:00:00 2001
From: Dibyamartanda Samanta <dibyaxp@noreply.codingworkshop.git>
Date: Fri, 24 May 2024 10:32:14 +0200
Subject: [PATCH] [NTOSKRNL:CC] Implementation of CcGetNumberOfMappedPages

Added CcGetNumberOfMappedPages,
---
 NTOSKRNL/CC/ccloghandler.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/NTOSKRNL/CC/ccloghandler.cpp b/NTOSKRNL/CC/ccloghandler.cpp
index 9e32236..d63709e 100644
--- a/NTOSKRNL/CC/ccloghandler.cpp
+++ b/NTOSKRNL/CC/ccloghandler.cpp
@@ -477,4 +477,22 @@ CcGetCachedDirtyPageCountForFile(PSECTION_OBJECT_POINTERS SectionObjectPointer)
   return DIRTYPAGES;
 }
 
+VOID NTAPI CcGetNumberOfMappedPages(
+    PSECTION_OBJECT_POINTERS SectionObjectPointers,
+    PULONG NoMappedVacbPage,
+    PULONG NoActivePages) 
+{
+    PSHARED_CACHE_MAP SharedCacheMap = SectionObjectPointers->SharedCacheMap;
+    *NoMappedVacbPage = nullptr;
+    *NoActivePages = nullptr;
+    if (SharedCacheMap) 
+    {
+        
+        SpinLockSharedGuard guard(&SharedCacheMap->VacbLock);
+        /*Calculate the number of pages based on NumMappedVacb and NumActiveVacb by Doing Half Page Shift*/
+        NoMappedVacbPage = &SharedCacheMap->NumMappedVacb << 6;
+        NoActivePages = &SharedCacheMap->NumActiveVacb << 6;  
+    } 
 
+   return; 
+}