Function pmap_copy_pages

freebsd/mips/mips/pmap.c:2680–2723

int unmapped_buf_allowed;

void
pmap_copy_pages(vm_page_t ma[], vm_offset_t a_offset, vm_page_t mb[],
    vm_offset_t b_offset, int xfersize)
{
	char *a_cp, *b_cp;
	vm_page_t a_m, b_m;
	vm_offset_t a_pg_offset, b_pg_offset;
	vm_paddr_t a_phys, b_phys;
	int cnt;

	while (xfersize > 0) {
		a_pg_offset = a_offset & PAGE_MASK;
		cnt = min(xfersize, PAGE_SIZE - a_pg_offset);
		a_m = ma[a_offset >> PAGE_SHIFT];
		a_phys = VM_PAGE_TO_PHYS(a_m);
		b_pg_offset = b_offset & PAGE_MASK;
		cnt = min(cnt, PAGE_SIZE - b_pg_offset);
		b_m = mb[b_offset >> PAGE_SHIFT];
		b_phys = VM_PAGE_TO_PHYS(b_m);
		if (MIPS_DIRECT_MAPPABLE(a_phys) &&
		    MIPS_DIRECT_MAPPABLE(b_phys)) {
			pmap_flush_pvcache(a_m);
			mips_dcache_wbinv_range_index(
			    MIPS_PHYS_TO_DIRECT(b_phys), PAGE_SIZE);
			a_cp = (char *)MIPS_PHYS_TO_DIRECT(a_phys) +
			    a_pg_offset;
			b_cp = (char *)MIPS_PHYS_TO_DIRECT(b_phys) +
			    b_pg_offset;
			bcopy(a_cp, b_cp, cnt);
			mips_dcache_wbinv_range((vm_offset_t)b_cp, cnt);
		} else {
			a_cp = (char *)pmap_lmem_map2(a_phys, b_phys);
			b_cp = (char *)a_cp + PAGE_SIZE;
			a_cp += a_pg_offset;
			b_cp += b_pg_offset;
			bcopy(a_cp, b_cp, cnt);
			mips_dcache_wbinv_range((vm_offset_t)b_cp, cnt);
			pmap_lmem_unmap();
		}
		a_offset += cnt;
		b_offset += cnt;
		xfersize -= cnt;
	}
}

vm_offset_t
pmap_quick_enter_page(vm_page_t m)