Function sysctl_kmaps

freebsd/amd64/amd64/pmap.c:11281–11418

}

static int
sysctl_kmaps(SYSCTL_HANDLER_ARGS)
{
	struct pmap_kernel_map_range range;
	struct sbuf sbuf, *sb;
	pml4_entry_t pml4e;
	pdp_entry_t *pdp, pdpe;
	pd_entry_t *pd, pde;
	pt_entry_t *pt, pte;
	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 = la57 ? KV5ADDR(NPML5EPG - 1, NPML4EPG - 1, NPDPEPG - 1,
	    NPDEPG - 1, NPTEPG - 1) : KV4ADDR(NPML4EPG - 1, NPDPEPG - 1,
	    NPDEPG - 1, NPTEPG - 1);

	/*
	 * Iterate over the kernel page tables without holding the kernel pmap
	 * lock.  Outside of the large map, kernel page table pages are never
	 * freed, so at worst we will observe inconsistencies in the output.
	 * Within the large map, ensure that PDP and PD page addresses are
	 * valid before descending.
	 */
	for (sva = 0, i = pmap_pml4e_index(sva); i < NPML4EPG; i++) {
		switch (i) {
		case PML4PML4I:
			sbuf_printf(sb, "\nRecursive map:\n");
			break;
		case DMPML4I:
			sbuf_printf(sb, "\nDirect map:\n");
			break;
		case KPML4BASE:
			sbuf_printf(sb, "\nKernel map:\n");
			break;
		case LMSPML4I:
			sbuf_printf(sb, "\nLarge map:\n");
			break;
		}

		/* Convert to canonical form. */
		if (sva == 1ul << 47)
			sva |= -1ul << 48;

restart:
		pml4e = kernel_pml4[i];
		if ((pml4e & X86_PG_V) == 0) {
			sva = rounddown2(sva, NBPML4);
			sysctl_kmaps_dump(sb, &range, sva);
			sva += NBPML4;
			continue;