Function pmap_copy_page

freebsd/mips/mips/pmap.c:2649–2676

* pmap_copy_page copies the specified (machine independent) * page by mapping the page into virtual memory and using * bcopy to copy the page, one machine dependent page at a * time. * * Use XKPHYS for 64 bit, and KSEG0 where possible for 32 bit. */

 * 	Use XKPHYS for 64 bit, and KSEG0 where possible for 32 bit.
 */
void
pmap_copy_page(vm_page_t src, vm_page_t dst)
{
	vm_offset_t va_src, va_dst;
	vm_paddr_t phys_src = VM_PAGE_TO_PHYS(src);
	vm_paddr_t phys_dst = VM_PAGE_TO_PHYS(dst);

	if (MIPS_DIRECT_MAPPABLE(phys_src) && MIPS_DIRECT_MAPPABLE(phys_dst)) {
		/* easy case, all can be accessed via KSEG0 */
		/*
		 * Flush all caches for VA that are mapped to this page
		 * to make sure that data in SDRAM is up to date
		 */
		pmap_flush_pvcache(src);
		mips_dcache_wbinv_range_index(
		    MIPS_PHYS_TO_DIRECT(phys_dst), PAGE_SIZE);
		va_src = MIPS_PHYS_TO_DIRECT(phys_src);
		va_dst = MIPS_PHYS_TO_DIRECT(phys_dst);
		bcopy((caddr_t)va_src, (caddr_t)va_dst, PAGE_SIZE);
		mips_dcache_wbinv_range(va_dst, PAGE_SIZE);
	} else {
		va_src = pmap_lmem_map2(phys_src, phys_dst);
		va_dst = va_src + PAGE_SIZE;
		bcopy((void *)va_src, (void *)va_dst, PAGE_SIZE);
		mips_dcache_wbinv_range(va_dst, PAGE_SIZE);
		pmap_lmem_unmap();
	}
}

int unmapped_buf_allowed;