Index: kernel/arch/ppc32/src/exception.S
===================================================================
--- kernel/arch/ppc32/src/exception.S	(revision 0867321c69ae9c3f09757e7ced1c100a578f28e3)
+++ kernel/arch/ppc32/src/exception.S	(revision e4d540b9c02c4c2607e9446c3b12b4db4c9ba97b)
@@ -28,4 +28,5 @@
 
 #include <arch/asm/regname.h>
+#include <arch/cpu.h>
 #include <arch/mm/page.h>
 
@@ -34,7 +35,7 @@
 .macro CONTEXT_STORE
 	
-	# save R12 in SPRG1, backup CR in R12
+	# save r12 in SPRG1, backup CR in r12
 	# save SP in SPRG2
-
+	
 	mtsprg1 r12
 	mfcr r12
@@ -288,5 +289,5 @@
 	
 	mfmsr r12
-	ori r12, r12, (msr_ir | msr_dr)@l
+	ori r12, r12, (MSR_IR | MSR_DR)@l
 	mtsrr1 r12
 	
@@ -307,5 +308,5 @@
 	
 	mfmsr r12
-	ori r12, r12, (msr_ir | msr_dr)@l
+	ori r12, r12, (MSR_IR | MSR_DR)@l
 	mtsrr1 r12