Function pmap_init

freebsd/arm64/arm64/pmap.c:1078–1173

* Initialize the pmap module. * Called by vm_init, to initialize any structures that the pmap * system needs to map virtual memory. */

 *	system needs to map virtual memory.
 */
void
pmap_init(void)
{
	struct vm_phys_seg *seg, *next_seg;
	struct md_page *pvh;
	vm_size_t s;
	uint64_t mmfr1;
	int i, pv_npg, vmid_bits;

	/*
	 * Are large page mappings enabled?
	 */
	TUNABLE_INT_FETCH("vm.pmap.superpages_enabled", &superpages_enabled);
	if (superpages_enabled) {
		KASSERT(MAXPAGESIZES > 1 && pagesizes[1] == 0,
		    ("pmap_init: can't assign to pagesizes[1]"));
		pagesizes[1] = L2_SIZE;
		KASSERT(MAXPAGESIZES > 2 && pagesizes[2] == 0,
		    ("pmap_init: can't assign to pagesizes[2]"));
		pagesizes[2] = L1_SIZE;
	}

	/*
	 * Initialize the ASID allocator.
	 */
	pmap_init_asids(&asids,
	    (READ_SPECIALREG(tcr_el1) & TCR_ASID_16) != 0 ? 16 : 8);

	if (has_hyp()) {
		mmfr1 = READ_SPECIALREG(id_aa64mmfr1_el1);
		vmid_bits = 8;

		if (ID_AA64MMFR1_VMIDBits_VAL(mmfr1) ==
		    ID_AA64MMFR1_VMIDBits_16)
			vmid_bits = 16;
		pmap_init_asids(&vmids, vmid_bits);
	}

	/*
	 * Initialize the pv chunk list mutex.
	 */
	mtx_init(&pv_chunks_mutex, "pmap pv chunk list", NULL, MTX_DEF);

	/*
	 * Initialize the pool of pv list locks.
	 */
	for (i = 0; i < NPV_LIST_LOCKS; i++)
		rw_init(&pv_list_locks[i], "pmap pv list");

	/*
	 * Calculate the size of the pv head table for superpages.
	 */
	pv_npg = 0;
	for (i = 0; i < vm_phys_nsegs; i++) {
		seg = &vm_phys_segs[i];
		pv_npg += pmap_l2_pindex(roundup2(seg->end, L2_SIZE)) -
		    pmap_l2_pindex(seg->start);
	}