Function pmap_copy_page

freebsd/arm/arm/pmap-v6.c:5918–5944

* 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. */

 *	time.
 */
void
pmap_copy_page(vm_page_t src, vm_page_t dst)
{
	pt2_entry_t *cmap1_pte2p, *cmap2_pte2p;
	struct pcpu *pc;

	sched_pin();
	pc = get_pcpu();
	cmap1_pte2p = pc->pc_cmap1_pte2p;
	cmap2_pte2p = pc->pc_cmap2_pte2p;
	mtx_lock(&pc->pc_cmap_lock);
	if (pte2_load(cmap1_pte2p) != 0)
		panic("%s: CMAP1 busy", __func__);
	if (pte2_load(cmap2_pte2p) != 0)
		panic("%s: CMAP2 busy", __func__);
	pte2_store(cmap1_pte2p, PTE2_KERN_NG(VM_PAGE_TO_PHYS(src),
	    PTE2_AP_KR | PTE2_NM, vm_page_pte2_attr(src)));
	pte2_store(cmap2_pte2p, PTE2_KERN_NG(VM_PAGE_TO_PHYS(dst),
	    PTE2_AP_KRW, vm_page_pte2_attr(dst)));
	bcopy(pc->pc_cmap1_addr, pc->pc_cmap2_addr, PAGE_SIZE);
	pte2_clear(cmap1_pte2p);
	tlb_flush((vm_offset_t)pc->pc_cmap1_addr);
	pte2_clear(cmap2_pte2p);
	tlb_flush((vm_offset_t)pc->pc_cmap2_addr);
	sched_unpin();
	mtx_unlock(&pc->pc_cmap_lock);
}

int unmapped_buf_allowed = 1;