Function sysctl_kmaps

freebsd/arm64/arm64/pmap.c:7118–7216

}

static int
sysctl_kmaps(SYSCTL_HANDLER_ARGS)
{
	struct pmap_kernel_map_range range;
	struct sbuf sbuf, *sb;
	pd_entry_t l0e, *l1, l1e, *l2, l2e;
	pt_entry_t *l3, l3e;
	vm_offset_t sva;
	vm_paddr_t pa;
	int error, i, j, k, l;

	error = sysctl_wire_old_buffer(req, 0);
	if (error != 0)
		return (error);
	sb = &sbuf;
	sbuf_new_for_sysctl(sb, NULL, PAGE_SIZE, req);

	/* Sentinel value. */
	range.sva = 0xfffffffffffffffful;

	/*
	 * Iterate over the kernel page tables without holding the kernel pmap
	 * lock.  Kernel page table pages are never freed, so at worst we will
	 * observe inconsistencies in the output.
	 */
	for (sva = 0xffff000000000000ul, i = pmap_l0_index(sva); i < Ln_ENTRIES;
	    i++) {
		if (i == pmap_l0_index(DMAP_MIN_ADDRESS))
			sbuf_printf(sb, "\nDirect map:\n");
		else if (i == pmap_l0_index(VM_MIN_KERNEL_ADDRESS))
			sbuf_printf(sb, "\nKernel map:\n");

		l0e = kernel_pmap->pm_l0[i];
		if ((l0e & ATTR_DESCR_VALID) == 0) {
			sysctl_kmaps_dump(sb, &range, sva);
			sva += L0_SIZE;
			continue;
		}
		pa = l0e & ~ATTR_MASK;
		l1 = (pd_entry_t *)PHYS_TO_DMAP(pa);

		for (j = pmap_l1_index(sva); j < Ln_ENTRIES; j++) {
			l1e = l1[j];
			if ((l1e & ATTR_DESCR_VALID) == 0) {
				sysctl_kmaps_dump(sb, &range, sva);
				sva += L1_SIZE;
				continue;
			}
			if ((l1e & ATTR_DESCR_MASK) == L1_BLOCK) {
				sysctl_kmaps_check(sb, &range, sva, l0e, l1e,
				    0, 0);
				range.l1blocks++;
				sva += L1_SIZE;
				continue;
			}
			pa = l1e & ~ATTR_MASK;
			l2 = (pd_entry_t *)PHYS_TO_DMAP(pa);