diff --git a/reactos/lib/rosrtl/misc/intrlck.c b/reactos/lib/rosrtl/misc/intrlck.c
index 780176dcd3f..3ccabe0ce20 100644
--- a/reactos/lib/rosrtl/misc/intrlck.c
+++ b/reactos/lib/rosrtl/misc/intrlck.c
@@ -15,6 +15,29 @@
  * Copied from kernel32
  */
 
+/* PowerPC Functions from gatomic.c in glib
+ *
+ * GLIB - Library of useful routines for C programming
+ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * g_atomic_*: atomic operations.
+ * Copyright (C) 2003 Sebastian Wilhelmi
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
 
 /************************************************************************
 *           InterlockedIncrement			                *
@@ -36,6 +59,7 @@ STDCALL
 InterlockedIncrement(PLONG Addend)
 {
 	long ret = 0;
+#ifdef _M_IX86
 	__asm__
 	(	  	 
 	   "\tlock\n"	/* for SMP systems */
@@ -48,6 +72,10 @@ InterlockedIncrement(PLONG Addend)
 	   "2:\n"
 	   :"=r" (ret):"r" (Addend), "0" (0): "memory"
 	);
+#elif defined(_M_PPC)
+        ret = *Addend;
+        ret = InterlockedExchangeAdd( Addend, ret + 1 );
+#endif
 	return ret;
 }
 
@@ -67,6 +95,7 @@ STDCALL
 InterlockedDecrement(LPLONG lpAddend)
 {
 	long ret;
+#ifdef _M_IX86
 	__asm__
 	(	  	 
 	   "\tlock\n"	/* for SMP systems */
@@ -79,6 +108,10 @@ InterlockedDecrement(LPLONG lpAddend)
 	   "2:\n"
 	   :"=r" (ret):"r" (lpAddend), "0" (0): "memory"          
 	);
+#elif defined(_M_PPC)
+        ret = *lpAddend;
+        ret = InterlockedExchangeAdd( lpAddend, ret - 1 );
+#endif
 	return ret;
 
 
@@ -97,14 +130,16 @@ LONG
 STDCALL 
 InterlockedExchange(LPLONG target, LONG value )
 {
-	
 	long ret;
+#ifdef _M_IX86
 	__asm__ ( /* lock for SMP systems */
                   "lock\n\txchgl %0,(%1)"
                   :"=r" (ret):"r" (target), "0" (value):"memory" );
+#elif defined(_M_PPC)
+        ret = *target;
+        while( InterlockedCompareExchange( target, value, ret ) != value );
+#endif
 	return ret;
-
-
 }
 
 /************************************************************************
@@ -124,8 +159,21 @@ InterlockedCompareExchange(
             LONG Comperand     ) 
 {
     LONG ret;
+#ifdef _M_IX86
     __asm__ __volatile__( "lock; cmpxchgl %2,(%1)"
                           : "=a" (ret) : "r" (Destination), "r" (Exchange), "0" (Comperand) : "memory" );
+#elif defined(_M_PPC)
+    __asm__ __volatile__ ("sync\n"
+                          "1: lwarx   %0,0,%1\n"
+                          "   subf.   %0,%2,%0\n"
+                          "   bne     2f\n"
+                          "   stwcx.  %3,0,%1\n"
+                          "   bne-    1b\n"
+                          "2: isync"
+                          : "=&r" (ret)
+                          : "b" (Destination), "r" (Comperand), "r" (Exchange)
+                          : "cr0", "memory"); 
+#endif
     return ret;
 }
 
@@ -145,14 +193,18 @@ InterlockedExchangeAdd(
 	    LONG Increment 
 ) 
 {
-
 	LONG ret;
+#ifdef _M_IX86
 	__asm__ ( /* lock for SMP systems */
                   "lock\n\t"
                   "xaddl %0,(%1)"
                   :"=r" (ret)
                   :"r" (Addend), "0" (Increment)
                   :"memory" );
+#elif defined(_M_PPC)
+        do
+            ret = *Addend;
+        while (!InterlockedCompareExchange(Addend, ret, ret + Increment));
+#endif
 	return ret;
-
 }