diff --git a/lib/libc/arch/powerpc/gen/syncicache.c b/lib/libc/arch/powerpc/gen/syncicache.c
index 569d4c361645..43501132860d 100644
--- a/lib/libc/arch/powerpc/gen/syncicache.c
+++ b/lib/libc/arch/powerpc/gen/syncicache.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: syncicache.c,v 1.8 2002/03/18 05:10:58 dbj Exp $	*/
+/*	$NetBSD: syncicache.c,v 1.9 2002/03/26 21:20:24 matt Exp $	*/
 
 /*
  * Copyright (C) 1995-1997, 1999 Wolfgang Solfrank.
@@ -92,11 +92,11 @@ getcachelinesize(void)
 #endif
 
 void
-__syncicache(void *from, int len)
+__syncicache(void *from, size_t len)
 {
-	int l, off;
+	size_t l, off;
+	size_t linesz;
 	char *p;
-	int linesz;
 
 #if	!defined(_KERNEL) && !defined(_STANDALONE)
 	if (!_cachelinesize)
@@ -105,24 +105,25 @@ __syncicache(void *from, int len)
 
 	if (CACHEINFO.dcache_size > 0) {
 		linesz = CACHEINFO.dcache_line_size;
-		off = (u_int)from & (linesz - 1);
-		l = len += off;
+		off = (uintptr_t)from & (linesz - 1);
+		l = (len + off + linesz - 1) & ~(linesz - 1);
 		p = (char *)from - off;
 		do {
 			__asm__ __volatile ("dcbst 0,%0" :: "r"(p));
 			p += linesz;
-		} while ((l -= linesz) > 0);
+		} while ((l -= linesz) != 0);
 	}
 	__asm__ __volatile ("sync");
 
 	if (CACHEINFO.icache_size > 0 ) {
 		linesz = CACHEINFO.icache_line_size;
-		off = (u_int)from & (linesz - 1);
+		off = (uintptr_t)from & (linesz - 1);
+		l = (len + off + linesz - 1) & ~(linesz - 1);
 		p = (char *)from - off;
 		do {
 			__asm__ __volatile ("icbi 0,%0" :: "r"(p));
 			p += linesz;
-		} while ((len -= linesz) > 0);
+		} while ((l -= linesz) != 0);
 	}
 	__asm__ __volatile ("isync");
 }
diff --git a/sys/arch/powerpc/include/cpu.h b/sys/arch/powerpc/include/cpu.h
index 4dc6eecdc3ae..3b4ee28e5a15 100644
--- a/sys/arch/powerpc/include/cpu.h
+++ b/sys/arch/powerpc/include/cpu.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: cpu.h,v 1.14 2002/03/13 00:38:13 eeh Exp $	*/
+/*	$NetBSD: cpu.h,v 1.15 2002/03/26 21:20:24 matt Exp $	*/
 
 /*
  * Copyright (C) 1999 Wolfgang Solfrank.
@@ -184,7 +184,7 @@ extern void icache_flush(vaddr_t, vsize_t);
 #endif
 #endif
 
-void __syncicache(void *, int);
+void __syncicache(void *, size_t);
 
 
 /*
diff --git a/sys/lib/libkern/arch/powerpc/syncicache.c b/sys/lib/libkern/arch/powerpc/syncicache.c
index edf8e8704fac..65bb0a8e3aee 100644
--- a/sys/lib/libkern/arch/powerpc/syncicache.c
+++ b/sys/lib/libkern/arch/powerpc/syncicache.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: syncicache.c,v 1.6 2002/03/18 05:10:59 dbj Exp $	*/
+/*	$NetBSD: syncicache.c,v 1.7 2002/03/26 21:20:24 matt Exp $	*/
 
 /*
  * Copyright (C) 1995-1997, 1999 Wolfgang Solfrank.
@@ -92,11 +92,11 @@ getcachelinesize(void)
 #endif
 
 void
-__syncicache(void *from, int len)
+__syncicache(void *from, size_t len)
 {
-	int l, off;
+	size_t l, off;
+	size_t linesz;
 	char *p;
-	int linesz;
 
 #if	!defined(_KERNEL) && !defined(_STANDALONE)
 	if (!_cachelinesize)
@@ -105,24 +105,25 @@ __syncicache(void *from, int len)
 
 	if (CACHEINFO.dcache_size > 0) {
 		linesz = CACHEINFO.dcache_line_size;
-		off = (u_int)from & (linesz - 1);
-		l = len += off;
+		off = (uintptr_t)from & (linesz - 1);
+		l = (len + off + linesz - 1) & ~(linesz - 1);
 		p = (char *)from - off;
 		do {
 			__asm__ __volatile ("dcbst 0,%0" :: "r"(p));
 			p += linesz;
-		} while ((l -= linesz) > 0);
+		} while ((l -= linesz) != 0);
 	}
 	__asm__ __volatile ("sync");
 
 	if (CACHEINFO.icache_size > 0 ) {
 		linesz = CACHEINFO.icache_line_size;
-		off = (u_int)from & (linesz - 1);
+		off = (uintptr_t)from & (linesz - 1);
+		l = (len + off + linesz - 1) & ~(linesz - 1);
 		p = (char *)from - off;
 		do {
 			__asm__ __volatile ("icbi 0,%0" :: "r"(p));
 			p += linesz;
-		} while ((len -= linesz) > 0);
+		} while ((l -= linesz) != 0);
 	}
 	__asm__ __volatile ("isync");
 }