Index: sys/sys/mman.h
===================================================================
RCS file: /usr/cvs/FreeBSD/src/sys/sys/mman.h,v
retrieving revision 1.40
diff -u -r1.40 mman.h
--- sys/sys/mman.h	2 Apr 2005 12:33:31 -0000	1.40
+++ sys/sys/mman.h	16 Jun 2005 15:20:32 -0000
@@ -87,6 +87,7 @@
  * Extended flags
  */
 #define	MAP_NOCORE	 0x00020000 /* dont include these pages in a coredump */
+#define	MAP_TRYFIXED	 0x00040000 /* take hint more seriously */
 #endif /* __BSD_VISIBLE */
 
 #if __POSIX_VISIBLE >= 199309
Index: sys/vm/vm_mmap.c
===================================================================
RCS file: /usr/cvs/FreeBSD/src/sys/vm/vm_mmap.c,v
retrieving revision 1.200
diff -u -r1.200 vm_mmap.c
--- sys/vm/vm_mmap.c	14 Apr 2005 16:03:30 -0000	1.200
+++ sys/vm/vm_mmap.c	17 Jun 2005 17:34:32 -0000
@@ -256,6 +256,8 @@
 		addr -= pageoff;
 		if (addr & PAGE_MASK)
 			return (EINVAL);
+        }
+	if (flags & (MAP_FIXED | MAP_TRYFIXED)) {
 		/* Address range must be all in user VM space. */
 		if (addr < vm_map_min(&vms->vm_map) ||
 		    addr + size > vm_map_max(&vms->vm_map))