Index: kernel/arch/ppc32/include/asm/regname.h
===================================================================
--- kernel/arch/ppc32/include/asm/regname.h	(revision c867756e3dd15aa4c2c589d0d850eb08ffa15ea8)
+++ kernel/arch/ppc32/include/asm/regname.h	(revision de9c5cbc90334782b655fd95ccf8e38ca75bd9be)
@@ -215,6 +215,6 @@
 
 /* MSR bits */
-#define msr_ir	(1 << 4)
-#define msr_dr	(1 << 5)
+#define msr_dr	(1 << 4)
+#define msr_ir	(1 << 5)
 #define msr_pr	(1 << 14)
 #define msr_ee	(1 << 15)
Index: kernel/arch/ppc32/include/exception.h
===================================================================
--- kernel/arch/ppc32/include/exception.h	(revision c867756e3dd15aa4c2c589d0d850eb08ffa15ea8)
+++ kernel/arch/ppc32/include/exception.h	(revision de9c5cbc90334782b655fd95ccf8e38ca75bd9be)
@@ -37,4 +37,5 @@
 
 #include <arch/types.h>
+#include <arch/regutils.h>
 
 typedef struct {
@@ -85,9 +86,8 @@
 
 /** Return true if exception happened while in userspace */
-#include <panic.h>
 static inline int istate_from_uspace(istate_t *istate)
 {
-	panic("istate_from_uspace not yet implemented");
-	return 0;
+	/* true if privilege level PR (copied from MSR) == 1 */
+	return (istate->srr1 & MSR_PR) != 0;
 }
 
Index: kernel/arch/ppc32/include/regutils.h
===================================================================
--- kernel/arch/ppc32/include/regutils.h	(revision de9c5cbc90334782b655fd95ccf8e38ca75bd9be)
+++ kernel/arch/ppc32/include/regutils.h	(revision de9c5cbc90334782b655fd95ccf8e38ca75bd9be)
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2008 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup ppc32
+ * @{
+ */
+/** 
+ * @file
+ * @brief Utilities for convenient manipulation with ppc32 registers.
+ */
+
+#ifndef KERN_ppc32_REGUTILS_H_
+#define KERN_ppc32_REGUTILS_H_
+
+#define MSR_PR (1 << 14)
+
+#endif
+
+/** @}
+ */