diff --git a/sys/arch/mips/include/cpuregs.h b/sys/arch/mips/include/cpuregs.h
index 2ac0b9825ee3..ab62983ae6f8 100644
--- a/sys/arch/mips/include/cpuregs.h
+++ b/sys/arch/mips/include/cpuregs.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: cpuregs.h,v 1.5 1996/03/28 11:34:05 jonathan Exp $	*/
+/*	$NetBSD: cpuregs.h,v 1.6 1997/05/18 03:19:41 jonathan Exp $	*/
 
 /*
  * Copyright (c) 1992, 1993
@@ -265,6 +265,19 @@
 #define MACH_SOFT_INT_MASK_1	0x0200
 #define MACH_SOFT_INT_MASK_0	0x0100
 
+/*
+ * nesting interrupt masks.
+ */
+#define MACH_INT_MASK_SPL_SOFT0	MACH_SOFT_INT_MASK_0
+#define MACH_INT_MASK_SPL_SOFT1	(MACH_SOFT_INT_MASK_1|MACH_SOFT_INT_MASK_1)
+#define MACH_INT_MASK_SPL0	(MACH_INT_MASK_0|MACH_INT_MASK_SPL_SOFT1)
+#define MACH_INT_MASK_SPL1	(MACH_INT_MASK_1|MACH_INT_MASK_SPL0)
+#define MACH_INT_MASK_SPL2	(MACH_INT_MASK_2|MACH_INT_MASK_SPL1)
+#define MACH_INT_MASK_SPL3	(MACH_INT_MASK_3|MACH_INT_MASK_SPL2)
+#define MACH_INT_MASK_SPL4	(MACH_INT_MASK_4|MACH_INT_MASK_SPL3)
+#define MACH_INT_MASK_SPL5	(MACH_INT_MASK_5|MACH_INT_MASK_SPL4)
+
+
 #ifdef pmax
 #define MACH_INT_MASK		MIPS_INT_MASK
 #define MACH_HARD_INT_MASK	MIPS_HARD_INT_MASK