Date: Mon, 14 Jul 2003 20:05:14 +0100 From: Josef Karthauser <joe@FreeBSD.org> To: arch@freebsd.org Subject: Importing 'mstohz' from NetBSD. Message-ID: <20030714190514.GA3270@genius.tao.org.uk>
next in thread | raw e-mail | index | archive | help
--LZvS9be/3tNcYl/X
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
It looks like NetBSD have a net function defined in the kernel.
--- param.h 2002/03/17 19:43:07 1.137
+++ param.h 2002/04/05 18:27:57 1.138
@@ -1,4 +1,4 @@
-/* $NetBSD: param.h,v 1.136 2002/03/09 01:42:13 thorpej Exp $ */
+/* $NetBSD: param.h,v 1.137 2002/03/17 19:43:07 atatat Exp $ */
=20
/*-
* Copyright (c) 1982, 1986, 1989, 1993
@@ -274,5 +274,20 @@
#ifndef UBC_NWINS
#define UBC_NWINS 1024
#endif
+
+#ifdef _KERNEL
+/*
+ * macro to convert from milliseconds to hz without integer overflow
+ * Default version using only 32bits arithmetics.
+ * 64bit port can define 64bit version in their <machine/param.h>
+ * 0x20000 is safe for hz < 20000
+ */
+#ifndef mstohz
+#define mstohz(ms) \
+ (__predict_false((ms) >=3D 0x20000) ? \
+ ((ms +0u) / 1000u) * hz : \
+ ((ms +0u) * hz) / 1000u)
+#endif
+#endif /* _KERNEL */
=20
#endif /* !_SYS_PARAM_H_ */
They have replaced TICKS_TO_HZ with calls to 'mstohz' in the usb stack
as well as in other places. Is this something that we want to do also?
Joe
--=20
Josef Karthauser (joe@tao.org.uk) http://www.josef-k.net/
FreeBSD (cvs meister, admin and hacker) http://www.uk.FreeBSD.org/
Physics Particle Theory (student) http://www.pact.cpes.sussex.ac.uk/
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D An eclectic mix of fact an=
d theory. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--LZvS9be/3tNcYl/X
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.2 (FreeBSD)
iEYEARECAAYFAj8S/uoACgkQXVIcjOaxUBaKHgCfVLa4RfUMCoCBfN0aKmqWlpZ3
rwwAnRizAO3TlWVsZ/zGmKtwwTNAyTC3
=bUOR
-----END PGP SIGNATURE-----
--LZvS9be/3tNcYl/X--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030714190514.GA3270>