Function devmap_vtop

freebsd/kern/subr_devmap.c:233–249

* Look up the given virtual address in the static mapping data and return the * corresponding physical address, or DEVMAP_PADDR_NOTFOUND if not found. */

 * corresponding physical address, or DEVMAP_PADDR_NOTFOUND if not found.
 */
vm_paddr_t
devmap_vtop(void * vpva, vm_size_t size)
{
	const struct devmap_entry *pd;
	vm_offset_t va;

	if (devmap_table == NULL)
		return (DEVMAP_PADDR_NOTFOUND);

	va = (vm_offset_t)vpva;
	for (pd = devmap_table; pd->pd_size != 0; ++pd) {
		if (va >= pd->pd_va && va + size <= pd->pd_va + pd->pd_size)
			return ((vm_paddr_t)(pd->pd_pa + (va - pd->pd_va)));
	}

	return (DEVMAP_PADDR_NOTFOUND);
}

/*
 * Map a set of physical memory pages into the kernel virtual address space.