Extend KSD with InterruptTime

sdk/xtdk/ketypes.h

@@ -460,6 +460,7 @@ typedef struct _KSYSTEM_TIME
 /* Kernel Shared Data (KSD) structure definition */
 typedef struct _KSHARED_DATA
 {
+    VOLATILE KSYSTEM_TIME InterruptTime;
     VOLATILE KSYSTEM_TIME SystemTime;
     ULONG XtMajorVersion;
     ULONG XtMinorVersion;

xtoskrnl/includes/ke/shdata.hh

@@ -21,9 +21,11 @@ namespace KE
             STATIC PKSHARED_DATA KernelSharedData;
 
         public:
+            STATIC XTAPI LARGE_INTEGER GetInterruptTime(VOID);
             STATIC XTAPI PKSHARED_DATA GetKernelSharedData(VOID);
             STATIC XTAPI LARGE_INTEGER GetSystemTime(VOID);
             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

@@ -9,6 +9,35 @@
 #include <xtos.hh>
 
 
+/**
+ * Retrieves the current interrupt time using a lock-free read mechanism.
+ *
+ * @return This routine returns a LARGE_INTEGER containing the interrupt time.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+LARGE_INTEGER
+KE::SharedData::GetInterruptTime(VOID)
+{
+    LARGE_INTEGER InterruptTime;
+
+    /* Initialize to zero */
+    InterruptTime.QuadPart = 0;
+
+    /* Perform a lock-free read sequence */
+    do
+    {
+        /* Read the primary high part and low part */
+        InterruptTime.HighPart = KernelSharedData->SystemTime.High1Part;
+        InterruptTime.LowPart = KernelSharedData->SystemTime.LowPart;
+    }
+    while(InterruptTime.HighPart != KernelSharedData->SystemTime.High2Part);
+
+    /* Return the 64-bit time */
+    return InterruptTime;
+}
+
 /**
  * Retrieves a pointer to the memory-mapped Kernel Shared Data.
  *
@@ -108,6 +137,26 @@ KE::SharedData::InitializeKernelSharedData(VOID)
                                     (sizeof(KernelSharedData->XtFullDate) / sizeof(WCHAR)) - 1);
 }
 
+/**
+ * Updates the global interrupt time using a strict lock-free write mechanism.
+ *
+ * @param Time
+ *        Supplies the new interrupt time as a 64-bit LARGE_INTEGER value.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+KE::SharedData::SetInterruptTime(IN LARGE_INTEGER Time)
+{
+    /* Set the new interrupt time */
+    KernelSharedData->InterruptTime.High2Part = Time.HighPart;
+    KernelSharedData->InterruptTime.LowPart = Time.LowPart;
+    KernelSharedData->InterruptTime.High1Part = Time.HighPart;
+}
+
 /**
  * Updates the global system time using a strict lock-free write mechanism.
  *