diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 2008-10-15 23:23:52 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 2008-10-15 23:23:52 +0000 |
| commit | 402af595bcaa120a104360ebebeb3d8f5eac8859 (patch) | |
| tree | 246ce2dffcd538c7674e8ed19b552cbadd811192 /sys/arch/amd64 | |
| parent | 01ed2ea8940e2739cafb585b7d5f8d8db553c397 (diff) | |
make random(9) return per-cpu values (by saving the seed in the cpuinfo),
which are uniform for the profclock on each cpu in a SMP system (but using
a different seed for each cpu). on all cpus, avoid seeding with a value out
of the [0, 2^31-1] range (since that is not stable)
ok kettenis drahn
Diffstat (limited to 'sys/arch/amd64')
| -rw-r--r-- | sys/arch/amd64/amd64/cpu.c | 3 | ||||
| -rw-r--r-- | sys/arch/amd64/include/cpu.h | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/sys/arch/amd64/amd64/cpu.c b/sys/arch/amd64/amd64/cpu.c index c7222a901d4..ee47764724e 100644 --- a/sys/arch/amd64/amd64/cpu.c +++ b/sys/arch/amd64/amd64/cpu.c @@ -1,4 +1,4 @@ -/* $OpenBSD: cpu.c,v 1.20 2008/10/06 20:42:02 chl Exp $ */ +/* $OpenBSD: cpu.c,v 1.21 2008/10/15 23:23:46 deraadt Exp $ */ /* $NetBSD: cpu.c,v 1.1 2003/04/26 18:39:26 fvdl Exp $ */ /*- @@ -397,6 +397,7 @@ cpu_boot_secondary_processors(void) ci = cpu_info[i]; if (ci == NULL) continue; + ci->ci_randseed = random(); if (ci->ci_idle_pcb == NULL) continue; if ((ci->ci_flags & CPUF_PRESENT) == 0) diff --git a/sys/arch/amd64/include/cpu.h b/sys/arch/amd64/include/cpu.h index 248a9659c6e..8bbe67e6ebc 100644 --- a/sys/arch/amd64/include/cpu.h +++ b/sys/arch/amd64/include/cpu.h @@ -1,4 +1,4 @@ -/* $OpenBSD: cpu.h,v 1.37 2008/07/18 23:43:31 art Exp $ */ +/* $OpenBSD: cpu.h,v 1.38 2008/10/15 23:23:46 deraadt Exp $ */ /* $NetBSD: cpu.h,v 1.1 2003/04/26 18:39:39 fvdl Exp $ */ /*- @@ -71,6 +71,7 @@ struct cpu_info { u_int ci_apicid; u_long ci_spin_locks; u_long ci_simple_locks; + u_int32_t ci_randseed; u_int64_t ci_scratch; |