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MFC: Explicitly switch to the new TSS when adding one in i386_extend_pcb().

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Approved by:	re (kensmith)
This commit is contained in:
jhb 2005-09-26 19:38:12 +00:00
parent 02ea2b090c
commit 0f21530145
2 changed files with 7 additions and 4 deletions
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10
sys/i386/i386/sys_machdep.c
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@ -263,13 +263,15 @@ i386_extend_pcb(struct thread *td)
ssd.ssd_limit -= ((unsigned)&ext->ext_tss - (unsigned)ext);
ssdtosd(&ssd, &ext->ext_tssd);
KASSERT(td->td_proc == curthread->td_proc, ("giving TSS to !curproc"));
KASSERT(td == curthread, ("giving TSS to !curthread"));
KASSERT(td->td_pcb->pcb_ext == 0, ("already have a TSS!"));
/* Switch to the new TSS. */
mtx_lock_spin(&sched_lock);
td->td_pcb->pcb_ext = ext;
/* switch to the new TSS after syscall completes */
td->td_flags |= TDF_NEEDRESCHED;
private_tss |= PCPU_GET(cpumask);
*PCPU_GET(tss_gdt) = ext->ext_tssd;
ltr(GSEL(GPROC0_SEL, SEL_KPL));
mtx_unlock_spin(&sched_lock);
return 0;

1
sys/i386/include/pcb_ext.h
View File

@ -44,6 +44,7 @@ struct pcb_ext {
};
#ifdef _KERNEL
extern int private_tss;
int i386_extend_pcb(struct thread *);