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| author | David Xu <davidxu@FreeBSD.org> | 2006-05-28 04:40:45 +0000 |
|---|---|---|
| committer | David Xu <davidxu@FreeBSD.org> | 2006-05-28 04:40:45 +0000 |
| commit | 40310f021dcc3d82235e0dd9debb9a50d2ddf1fe (patch) | |
| tree | 29ddd8a99f3511bbe777d9eee2fbc81561ed8d55 /sys/i386 | |
| parent | 38fd748725dcbeabf82d6f82c16d0307e849f1ea (diff) | |
| download | src-40310f021dcc3d82235e0dd9debb9a50d2ddf1fe.tar.gz src-40310f021dcc3d82235e0dd9debb9a50d2ddf1fe.zip | |
If parent thread never used FPU, the only work is to clear flag
PCB_NPXINITDONE for new thread and let trap code initialize it.
Notes
Notes:
svn path=/head/; revision=158996
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/isa/npx.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/i386/isa/npx.c b/sys/i386/isa/npx.c index 7b7f3a5c670d..129a853f20ed 100644 --- a/sys/i386/isa/npx.c +++ b/sys/i386/isa/npx.c @@ -952,9 +952,14 @@ npx_fork_thread(struct thread *td, struct thread *newtd) u_int32_t mxcsr; u_int32_t cw; + if (!(td->td_pcb->pcb_flags & PCB_NPXINITDONE)) { + newtd->td_pcb->pcb_flags &= ~PCB_NPXINITDONE; + return; + } + state = &newtd->td_pcb->pcb_save; /* get control word */ - if (npxgetregs(td, &newtd->td_pcb->pcb_save)) + if (npxgetregs(td, state)) return; if (cpu_fxsr) { mxcsr = state->sv_xmm.sv_env.en_mxcsr; |