Implement more CPU-related routines

xtoskrnl/includes/i686/ar.h

@@ -58,6 +58,10 @@ XTCDECL
 ULONG_PTR
 ArReadControlRegister(IN USHORT ControlRegister);
 
+XTCDECL
+ULONG_PTR
+ArReadDebugRegister(IN USHORT DebugRegister);
+
 XTCDECL
 ULONG
 ArReadFSDualWord(ULONG Offset);
@@ -66,6 +70,10 @@ XTCDECL
 ULONGLONG
 ArReadModelSpecificRegister(IN ULONG Register);
 
+XTCDECL
+UINT
+ArReadMxCsrRegister();
+
 XTCDECL
 ULONGLONG
 ArReadTimeStampCounter();
@@ -88,6 +96,10 @@ XTCDECL
 VOID
 ArStoreInterruptDescriptorTable(OUT PVOID Destination);
 
+XTCDECL
+VOID
+ArStoreLocalDescriptorTable(OUT PVOID Destination);
+
 XTCDECL
 VOID
 ArStoreSegment(IN USHORT Segment,
@@ -102,6 +114,11 @@ VOID
 ArWriteControlRegister(IN USHORT ControlRegister,
                        IN UINT_PTR Value);
 
+XTCDECL
+VOID
+ArWriteDebugRegister(IN USHORT DebugRegister,
+                     IN UINT_PTR Value);
+
 XTCDECL
 VOID
 ArWriteEflagsRegister(IN UINT_PTR Value);