Function pmap_mapdev_attr

freebsd/mips/mips/pmap.c:3217–3245

* Map a set of physical memory pages into the kernel virtual * address space. Return a pointer to where it is mapped. This * routine is intended to be used for mapping device memory, * NOT real memory. * * Use XKPHYS uncached for 64 bit, and KSEG1 where possible for 32 bit. */

 * Use XKPHYS uncached for 64 bit, and KSEG1 where possible for 32 bit.
 */
void *
pmap_mapdev_attr(vm_paddr_t pa, vm_size_t size, vm_memattr_t ma)
{
        vm_offset_t va, tmpva, offset;

	/*
	 * KSEG1 maps only first 512M of phys address space. For
	 * pa > 0x20000000 we should make proper mapping * using pmap_kenter.
	 */
	if (MIPS_DIRECT_MAPPABLE(pa + size - 1) && ma == VM_MEMATTR_UNCACHEABLE)
		return ((void *)MIPS_PHYS_TO_DIRECT_UNCACHED(pa));
	else {
		offset = pa & PAGE_MASK;
		size = roundup(size + offset, PAGE_SIZE);

		va = kva_alloc(size);
		if (!va)
			panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
		pa = trunc_page(pa);
		for (tmpva = va; size > 0;) {
			pmap_kenter_attr(tmpva, pa, ma);
			size -= PAGE_SIZE;
			tmpva += PAGE_SIZE;
			pa += PAGE_SIZE;
		}
	}

	return ((void *)(va + offset));
}

void *
pmap_mapdev(vm_paddr_t pa, vm_size_t size)