PUBLIC void save_fpu(struct proc *pr)
{
#ifdef CONFIG_SMP
if (cpuid == pr->p_cpu) {
if (get_cpulocal_var(fpu_owner) == pr) {
disable_fpu_exception();
save_local_fpu(pr);
}
}
else {
int stopped;
/* remember if the process was already stopped */
stopped = RTS_ISSET(pr, RTS_PROC_STOP);
/* stop the remote process and force it's context to be saved */
smp_schedule_stop_proc_save_ctx(pr);
/*
* If the process wasn't stopped let the process run again. The
* process is kept block by the fact that the kernel cannot run
* on its cpu
*/
if (!stopped)
RTS_UNSET(pr, RTS_PROC_STOP);
}
#else
if (get_cpulocal_var(fpu_owner) == pr) {
disable_fpu_exception();
save_local_fpu(pr);
}
#endif
}
void smp_sched_handler(void)
{
unsigned flgs;
unsigned cpu = cpuid;
flgs = sched_ipi_data[cpu].flags;
if (flgs) {
struct proc * p;
p = (struct proc *)sched_ipi_data[cpu].data;
if (flgs & SCHED_IPI_STOP_PROC) {
RTS_SET(p, RTS_PROC_STOP);
}
if (flgs & SCHED_IPI_SAVE_CTX) {
/* all context has been saved already, FPU remains */
if (proc_used_fpu(p) &&
get_cpulocal_var(fpu_owner) == p) {
disable_fpu_exception();
save_local_fpu(p, FALSE /*retain*/);
/* we're preparing to migrate somewhere else */
release_fpu(p);
}
}
if (flgs & SCHED_IPI_VM_INHIBIT) {
RTS_SET(p, RTS_VMINHIBIT);
}
}
__insn_barrier();
sched_ipi_data[cpu].flags = 0;
}
