Function pglvl_max_pages

freebsd/x86/iommu/intel_utils.c:177–188

* Calculate the total amount of page table pages needed to map the * whole bus address space on the context with the selected agaw. */

 * whole bus address space on the context with the selected agaw.
 */
vm_pindex_t
pglvl_max_pages(int pglvl)
{
	vm_pindex_t res;
	int i;

	for (res = 0, i = pglvl; i > 0; i--) {
		res *= DMAR_NPTEPG;
		res++;
	}
	return (res);
}

/*
 * Return true if the page table level lvl supports the superpage for