Allow redefiniton of KERNBASE. Because the type of this constant is

different for locore.S and the rest of the kernel, if you redefine
it from the default value, you must also define KERNBASE_LOCORE -- this
is ugly, but so is having the same constant with two different types
depending where in the kernel it's used...

sys/arch/i386/include/param.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: param.h,v 1.54 2003/02/26 21:29:02 fvdl Exp $	*/
+/*	$NetBSD: param.h,v 1.55 2003/07/18 17:33:05 tls Exp $	*/
 
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
@@ -80,11 +80,24 @@
 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
 #define	NPTEPG		(NBPG/(sizeof (pt_entry_t)))
 
+#ifdef KERNBASE
+#ifndef KERNBASE_LOCORE
+#error you must define KERNBASE_LOCORE if you define KERNBASE.
+#endif
+#ifdef _LOCORE
+#undef KERNBASE
+#define KERNBASE KERNBASE_LOCORE
+#endif /* _LOCORE */
+#endif /* KERNBASE */
+
+#ifndef KERNBASE
 #ifndef _LOCORE
 #define	KERNBASE	0xc0000000UL	/* start of kernel virtual space */
 #else
 #define	KERNBASE	0xc0000000	/* start of kernel virtual space */
-#endif
+#endif /* _LOCORE */
+#endif /* KERNBASE */
+
 #define	KERNTEXTOFF	(KERNBASE + 0x100000) /* start of kernel text */
 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)