Function pmap_enter_object

freebsd/amd64/amd64/pmap.c:7204–7235

* Maps a sequence of resident pages belonging to the same object. * The sequence begins with the given page m_start. This page is * mapped at the given virtual address start. Each subsequent page is * mapped at a virtual address that is offset from start by the same * amount as the page is offset from m_start within the object. The * last page in the sequence is the page with the largest o

 * corresponding offset from m_start are mapped.
 */
void
pmap_enter_object(pmap_t pmap, vm_offset_t start, vm_offset_t end,
    vm_page_t m_start, vm_prot_t prot)
{
	struct rwlock *lock;
	vm_offset_t va;
	vm_page_t m, mpte;
	vm_pindex_t diff, psize;

	VM_OBJECT_ASSERT_LOCKED(m_start->object);

	psize = atop(end - start);
	mpte = NULL;
	m = m_start;
	lock = NULL;
	PMAP_LOCK(pmap);
	while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
		va = start + ptoa(diff);
		if ((va & PDRMASK) == 0 && va + NBPDR <= end &&
		    m->psind == 1 && pmap_ps_enabled(pmap) &&
		    pmap_allow_2m_x_page(pmap, (prot & VM_PROT_EXECUTE) != 0) &&
		    pmap_enter_2mpage(pmap, va, m, prot, &lock))
			m = &m[NBPDR / PAGE_SIZE - 1];
		else
			mpte = pmap_enter_quick_locked(pmap, va, m, prot,
			    mpte, &lock);
		m = TAILQ_NEXT(m, listq);
	}
	if (lock != NULL)
		rw_wunlock(lock);
	PMAP_UNLOCK(pmap);
}

/*
 * this code makes some *MAJOR* assumptions: