Function pmap_invalidate_range_int

freebsd/i386/i386/pmap.c:1256–1284

#define	PMAP_INVLPG_THRESHOLD	(4 * 1024 * PAGE_SIZE)

static void
pmap_invalidate_range_int(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
{
	cpuset_t *mask, other_cpus;
	vm_offset_t addr;
	u_int cpuid;

	if (eva - sva >= PMAP_INVLPG_THRESHOLD) {
		pmap_invalidate_all_int(pmap);
		return;
	}

	sched_pin();
	if (pmap == kernel_pmap) {
		for (addr = sva; addr < eva; addr += PAGE_SIZE)
			invlpg(addr);
		mask = &all_cpus;
	} else  if (!CPU_CMP(&pmap->pm_active, &all_cpus)) {
		mask = &all_cpus;
	} else {
		cpuid = PCPU_GET(cpuid);
		other_cpus = all_cpus;
		CPU_CLR(cpuid, &other_cpus);
		CPU_AND(&other_cpus, &pmap->pm_active);
		mask = &other_cpus;
	}
	smp_masked_invlpg_range(*mask, sva, eva, pmap, pmap_curcpu_cb_dummy);
	sched_unpin();
}

static void
pmap_invalidate_all_int(pmap_t pmap)