Function vmem_init

freebsd/kern/subr_vmem.c:1235–1283

* vmem_init: Initializes vmem arena. */

 * vmem_init: Initializes vmem arena.
 */
vmem_t *
vmem_init(vmem_t *vm, const char *name, vmem_addr_t base, vmem_size_t size,
    vmem_size_t quantum, vmem_size_t qcache_max, int flags)
{
	vmem_size_t i;

	MPASS(quantum > 0);
	MPASS((quantum & (quantum - 1)) == 0);

	bzero(vm, sizeof(*vm));

	VMEM_CONDVAR_INIT(vm, name);
	VMEM_LOCK_INIT(vm, name);
	vm->vm_nfreetags = 0;
	LIST_INIT(&vm->vm_freetags);
	strlcpy(vm->vm_name, name, sizeof(vm->vm_name));
	vm->vm_quantum_mask = quantum - 1;
	vm->vm_quantum_shift = flsl(quantum) - 1;
	vm->vm_nbusytag = 0;
	vm->vm_size = 0;
	vm->vm_limit = 0;
	vm->vm_inuse = 0;
	qc_init(vm, qcache_max);

	TAILQ_INIT(&vm->vm_seglist);
	vm->vm_cursor.bt_start = vm->vm_cursor.bt_size = 0;
	vm->vm_cursor.bt_type = BT_TYPE_CURSOR;
	TAILQ_INSERT_TAIL(&vm->vm_seglist, &vm->vm_cursor, bt_seglist);

	for (i = 0; i < VMEM_MAXORDER; i++)
		LIST_INIT(&vm->vm_freelist[i]);

	memset(&vm->vm_hash0, 0, sizeof(vm->vm_hash0));
	vm->vm_hashsize = VMEM_HASHSIZE_MIN;
	vm->vm_hashlist = vm->vm_hash0;

	if (size != 0) {
		if (vmem_add(vm, base, size, flags) != 0) {
			vmem_destroy1(vm);
			return NULL;
		}
	}

	mtx_lock(&vmem_list_lock);
	LIST_INSERT_HEAD(&vmem_list, vm, vm_alllist);
	mtx_unlock(&vmem_list_lock);

	return vm;
}

/*
 * vmem_create: create an arena.