diff options
| author | Philip Guenther <guenther@cvs.openbsd.org> | 2015-02-07 03:29:28 +0000 |
|---|---|---|
| committer | Philip Guenther <guenther@cvs.openbsd.org> | 2015-02-07 03:29:28 +0000 |
| commit | f8b39c127abbdd72c5b0b1c74d92005f6822c3ef (patch) | |
| tree | 68b70a94ff4bcc896f028c5f0ccad1d15bd0f48a /sys/arch | |
| parent | 16e8f4a1afc82f3414c69478b0e501616da4602f (diff) | |
Document a non-obvious aspect of identifycpu() use on i386
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/i386/i386/machdep.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c index 76cdf11851a..4c45ad25921 100644 --- a/sys/arch/i386/i386/machdep.c +++ b/sys/arch/i386/i386/machdep.c @@ -1,4 +1,4 @@ -/* $OpenBSD: machdep.c,v 1.565 2015/02/06 05:17:48 mlarkin Exp $ */ +/* $OpenBSD: machdep.c,v 1.566 2015/02/07 03:29:27 guenther Exp $ */ /* $NetBSD: machdep.c,v 1.214 1996/11/10 03:16:17 thorpej Exp $ */ /*- @@ -1666,6 +1666,14 @@ cyrix3_cpu_name(int model, int step) * information; however, the chance of multi-vendor SMP actually * ever *working* is sufficiently low that it's probably safe to assume * all processors are of the same vendor. + * + * Note that identifycpu() is called twice for the primary CPU: the first + * is very early (right after the "OpenBSD X.Y" line) with the CPUF_PRIMARY + * flag *not* set, then again later in the config sequence with CPUF_PRIMARY + * set. Thus, the tests here for ((ci->ci_flags & CPUF_PRIMARY) == 0) are + * actually saying "do this on the first call for each CPU". Don't change + * them to use CPU_IS_PRIMARY() because then they would be done on both + * calls in the SP build. */ void |