diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2009-10-26 20:30:24 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2009-10-26 20:30:24 +0000 |
| commit | de979dcf7ac047a8b1d687912e3f2849ae6b127d (patch) | |
| tree | 671a6fa9d99a13ddee35565d1012b3169e1ef9a9 /sys | |
| parent | c16d88bf4bfc8e8526f12a85971a6f35865648c5 (diff) | |
Load %mxcsr when initializing the FPU on machines that support SSE.
ok deraadt@
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/i386/isa/npx.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/sys/arch/i386/isa/npx.c b/sys/arch/i386/isa/npx.c index 3f12236881b..5cf28f5d05b 100644 --- a/sys/arch/i386/isa/npx.c +++ b/sys/arch/i386/isa/npx.c @@ -1,4 +1,4 @@ -/* $OpenBSD: npx.c,v 1.45 2009/10/03 21:51:01 kettenis Exp $ */ +/* $OpenBSD: npx.c,v 1.46 2009/10/26 20:30:23 kettenis Exp $ */ /* $NetBSD: npx.c,v 1.57 1996/05/12 23:12:24 mycroft Exp $ */ #if 0 @@ -605,6 +605,7 @@ x86fpflags_to_siginfo(u_int32_t flags) int npxdna_xmm(struct cpu_info *ci) { + union savefpu *addr; struct proc *p; int s; @@ -661,8 +662,12 @@ npxdna_xmm(struct cpu_info *ci) splx(s); uvmexp.fpswtch++; + addr = &p->p_addr->u_pcb.pcb_savefpu; + if ((p->p_md.md_flags & MDP_USEDFPU) == 0) { - fldcw(&p->p_addr->u_pcb.pcb_savefpu.sv_xmm.sv_env.en_cw); + fldcw(&addr->sv_xmm.sv_env.en_cw); + if (i386_has_sse || i386_has_sse2) + ldmxcsr(&addr->sv_xmm.sv_env.en_mxcsr); p->p_md.md_flags |= MDP_USEDFPU; } else { static double zero = 0.0; @@ -673,7 +678,7 @@ npxdna_xmm(struct cpu_info *ci) */ fnclex(); __asm __volatile("ffree %%st(7)\n\tfld %0" : : "m" (zero)); - fxrstor(&p->p_addr->u_pcb.pcb_savefpu.sv_xmm); + fxrstor(&addr->sv_xmm); } return (1); |