diff options
| author | Philip Guenther <guenther@cvs.openbsd.org> | 2018-07-09 12:58:44 +0000 |
|---|---|---|
| committer | Philip Guenther <guenther@cvs.openbsd.org> | 2018-07-09 12:58:44 +0000 |
| commit | a8b088af2940490a9c39f2006e54bd9743c30d6e (patch) | |
| tree | 762e2d9f0eb58b7d633bc51e71fa909a0a516bd5 /sys/arch/amd64 | |
| parent | 9c82a920fc3bd8495058710133523190be2eb8f0 (diff) | |
Rest the FPU's fcw and mxcsr before initializing the "FPU reset state" area
problem discovered on bluhm@'s old opteron
ok deraadt@ kettenis@
Diffstat (limited to 'sys/arch/amd64')
| -rw-r--r-- | sys/arch/amd64/amd64/cpu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/arch/amd64/amd64/cpu.c b/sys/arch/amd64/amd64/cpu.c index 12489c05a7e..4ad2069c0d7 100644 --- a/sys/arch/amd64/amd64/cpu.c +++ b/sys/arch/amd64/amd64/cpu.c @@ -1,4 +1,4 @@ -/* $OpenBSD: cpu.c,v 1.123 2018/06/19 19:29:52 kettenis Exp $ */ +/* $OpenBSD: cpu.c,v 1.124 2018/07/09 12:58:43 guenther Exp $ */ /* $NetBSD: cpu.c,v 1.1 2003/04/26 18:39:26 fvdl Exp $ */ /*- @@ -571,6 +571,9 @@ cpu_init(struct cpu_info *ci) /* Give proc0 a clean FPU save area */ sfp = &proc0.p_addr->u_pcb.pcb_savefpu; memset(sfp, 0, fpu_save_len); + sfp->fp_fxsave.fx_fcw = __INITIAL_NPXCW__; + sfp->fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__; + fpureset(); if (xsave_mask) { /* must not use xsaveopt here */ xsave(sfp, xsave_mask); |