Add TickCount to Kernel Shared Data

sdk/xtdk/ketypes.h

@@ -462,6 +462,7 @@ typedef struct _KSHARED_DATA
 {
     VOLATILE KSYSTEM_TIME InterruptTime;
     VOLATILE KSYSTEM_TIME SystemTime;
+    VOLATILE KSYSTEM_TIME TickCount;
     ULONG XtMajorVersion;
     ULONG XtMinorVersion;
     WCHAR XtBuild[8];

xtoskrnl/includes/ke/shdata.hh

@@ -24,6 +24,8 @@ namespace KE
             STATIC XTAPI LARGE_INTEGER GetInterruptTime(VOID);
             STATIC XTAPI PKSHARED_DATA GetKernelSharedData(VOID);
             STATIC XTAPI LARGE_INTEGER GetSystemTime(VOID);
+            STATIC XTAPI LARGE_INTEGER GetTickCount(VOID);
+            STATIC XTAPI VOID IncrementTickCount();
             STATIC XTAPI VOID InitializeKernelSharedData(VOID);
             STATIC XTAPI VOID SetInterruptTime(IN LARGE_INTEGER Time);
             STATIC XTAPI VOID SetSystemTime(IN LARGE_INTEGER Time);

xtoskrnl/ke/shdata.cc

@@ -82,6 +82,48 @@ KE::SharedData::GetSystemTime(VOID)
     return CurrentTime;
 }
 
+/**
+ * Retrieves the global system tick count.
+ *
+ * @return This routine returns the current tick count.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+LARGE_INTEGER
+KE::SharedData::GetTickCount(VOID)
+{
+    LARGE_INTEGER Ticks;
+
+    /* Read the 64-bit tick count */
+    Ticks.QuadPart = (*(ULONGLONG*)&KernelSharedData->TickCount);
+
+    /* Return the retrieved tick count */
+    return Ticks;
+}
+
+/**
+ * Increments the global system tick count by one using a strict lock-free write mechanism.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+KE::SharedData::IncrementTickCount()
+{
+    LARGE_INTEGER Ticks;
+
+    /* Increment tick count */
+    Ticks.QuadPart = (*(ULONGLONG*)&KernelSharedData->TickCount) + 1;
+
+    /* Set the new tick count */
+    KernelSharedData->TickCount.High2Part = Ticks.HighPart;
+    KernelSharedData->TickCount.LowPart = Ticks.LowPart;
+    KernelSharedData->TickCount.High1Part = Ticks.HighPart;
+}
+
 /**
  * Maps and initializes the Kernel Shared Data (KSD) structure.
  *