Function mips_ipi_handler

freebsd/mips/mips/mp_machdep.c:115–180

* Handle an IPI sent to this processor. */

 * Handle an IPI sent to this processor.
 */
static int
mips_ipi_handler(void *arg)
{
	u_int	cpu, ipi, ipi_bitmap;
	int	bit;

	cpu = PCPU_GET(cpuid);

	platform_ipi_clear();	/* quiesce the pending ipi interrupt */

	ipi_bitmap = atomic_readandclear_int(PCPU_PTR(pending_ipis));
	if (ipi_bitmap == 0)
		return (FILTER_STRAY);

	CTR1(KTR_SMP, "smp_handle_ipi(), ipi_bitmap=%x", ipi_bitmap);

	while ((bit = ffs(ipi_bitmap))) {
		bit = bit - 1;
		ipi = 1 << bit;
		ipi_bitmap &= ~ipi;
		switch (ipi) {
		case IPI_RENDEZVOUS:
			CTR0(KTR_SMP, "IPI_RENDEZVOUS");
			smp_rendezvous_action();
			break;

		case IPI_AST:
			CTR0(KTR_SMP, "IPI_AST");
			break;

		case IPI_STOP:
			/*
			 * IPI_STOP_HARD is mapped to IPI_STOP so it is not
			 * necessary to add it in the switch.
			 */
			CTR0(KTR_SMP, "IPI_STOP or IPI_STOP_HARD");

			savectx(&stoppcbs[cpu]);
			tlb_save();

			/* Indicate we are stopped */
			CPU_SET_ATOMIC(cpu, &stopped_cpus);

			/* Wait for restart */
			while (!CPU_ISSET(cpu, &started_cpus))
				cpu_spinwait();

			CPU_CLR_ATOMIC(cpu, &started_cpus);
			CPU_CLR_ATOMIC(cpu, &stopped_cpus);
			CTR0(KTR_SMP, "IPI_STOP (restart)");
			break;
		case IPI_PREEMPT:
			CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__);
			sched_preempt(curthread);
			break;
		case IPI_HARDCLOCK:
			CTR1(KTR_SMP, "%s: IPI_HARDCLOCK", __func__);
			hardclockintr();