Function devmap_bootstrap

freebsd/kern/subr_devmap.c:178–207

* Map all of the static regions in the devmap table, and remember the devmap * table so the mapdev, ptov, and vtop functions can do lookups later. * * If a non-NULL table pointer is given it is used unconditionally, otherwise * the previously-registered table is used. This smooths transition from legacy * code that fills in a local table then calls this function passing that table, * and ne

 * with a NULL pointer.
 */
void
devmap_bootstrap(vm_offset_t l1pt, const struct devmap_entry *table)
{
	const struct devmap_entry *pd;

	devmap_bootstrap_done = true;

	/*
	 * If given a table pointer, use it.  Otherwise, if a table was
	 * previously registered, use it.  Otherwise, no work to do.
	 */
	if (table != NULL)
		devmap_table = table;
	else if (devmap_table == NULL)
		return;

	for (pd = devmap_table; pd->pd_size != 0; ++pd) {
#if defined(__arm__)
#if __ARM_ARCH >= 6
		pmap_preboot_map_attr(pd->pd_pa, pd->pd_va, pd->pd_size,
		    VM_PROT_READ | VM_PROT_WRITE, VM_MEMATTR_DEVICE);
#else
		pmap_map_chunk(l1pt, pd->pd_va, pd->pd_pa, pd->pd_size,
		    VM_PROT_READ | VM_PROT_WRITE, PTE_DEVICE);
#endif
#elif defined(__aarch64__) || defined(__riscv)
		pmap_kenter_device(pd->pd_va, pd->pd_size, pd->pd_pa);
#endif
	}
}

/*
 * Look up the given physical address in the static mapping data and return the