diff --git a/sys/dev/usb/usb_busdma.c b/sys/dev/usb/usb_busdma.c
index d31aeec..4c613cf 100644
--- a/sys/dev/usb/usb_busdma.c
+++ b/sys/dev/usb/usb_busdma.c
@@ -369,7 +369,7 @@ usb_dma_tag_create(struct usb_dma_tag *udt,
 	    (2 + (size / USB_PAGE_SIZE)) : 1,
 	     /* maxsegsz  */ (align == 1 && size > USB_PAGE_SIZE) ?
 	    USB_PAGE_SIZE : size,
-	     /* flags     */ BUS_DMA_KEEP_PG_OFFSET,
+	     /* flags     */ BUS_DMA_KEEP_PG_OFFSET | BUS_DMA_NO_PAGEZERO,
 	     /* lockfn    */ &usb_dma_lock_cb,
 	     /* lockarg   */ NULL,
 	    &tag)) {
diff --git a/sys/sys/bus_dma.h b/sys/sys/bus_dma.h
index 0dad326..7771d32 100644
--- a/sys/sys/bus_dma.h
+++ b/sys/sys/bus_dma.h
@@ -109,6 +109,9 @@
  */
 #define	BUS_DMA_KEEP_PG_OFFSET	0x400
 
+/* Do not use the physical page zero. */
+#define	BUS_DMA_NO_PAGEZERO	0x800
+
 /* Forwards needed by prototypes below. */
 struct mbuf;
 struct uio;
diff --git a/sys/x86/x86/busdma_machdep.c b/sys/x86/x86/busdma_machdep.c
index 70dd72b..02a0602 100644
--- a/sys/x86/x86/busdma_machdep.c
+++ b/sys/x86/x86/busdma_machdep.c
@@ -171,8 +171,10 @@ run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
 		 && (dmat->filter == NULL
 		  || (*dmat->filter)(dmat->filterarg, paddr) != 0))
 			retval = 1;
+		else if ((dmat->flags & BUS_DMA_NO_PAGEZERO) != 0 && paddr == 0)
+			retval = 1;
 
-		dmat = dmat->parent;		
+		dmat = dmat->parent;
 	} while (retval == 0 && dmat != NULL);
 	return (retval);
 }
@@ -293,8 +295,11 @@ bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
 			atomic_add_int(&parent->ref_count, 1);
 	}
 
-	if (newtag->lowaddr < ptoa((vm_paddr_t)Maxmem)
-	 || newtag->alignment > 1)
+	if (newtag->lowaddr < ptoa((vm_paddr_t)Maxmem) ||
+	    newtag->alignment > 1)
+		newtag->flags |= BUS_DMA_COULD_BOUNCE;
+
+	if ((newtag->flags & BUS_DMA_NO_PAGEZERO) != 0)
 		newtag->flags |= BUS_DMA_COULD_BOUNCE;
 
 	if (((newtag->flags & BUS_DMA_COULD_BOUNCE) != 0) &&
@@ -523,7 +528,8 @@ bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
 	 */
 	if ((dmat->maxsize <= PAGE_SIZE) &&
 	   (dmat->alignment < dmat->maxsize) &&
-	    dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem)) {
+	    dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem) &&
+	    (dmat->flags & BUS_DMA_NO_PAGEZERO) == 0) {
 		*vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags);
 	} else {
 		/*
@@ -533,7 +539,8 @@ bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
 		 * XXX Certain AGP hardware does.
 		 */
 		*vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags,
-		    0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul,
+		    (dmat->flags & BUS_DMA_NO_PAGEZERO) != 0 ? PAGE_SIZE : 0,
+		    dmat->lowaddr, dmat->alignment ? dmat->alignment : 1ul,
 		    dmat->boundary);
 	}
 	if (*vaddr == NULL) {
@@ -567,7 +574,8 @@ bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
 	pmap_change_attr((vm_offset_t)vaddr, dmat->maxsize, PAT_WRITE_BACK);
 	if ((dmat->maxsize <= PAGE_SIZE) &&
 	   (dmat->alignment < dmat->maxsize) &&
-	    dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem))
+	    dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem) &&
+	    (dmat->flags & BUS_DMA_NO_PAGEZERO) == 0)
 		free(vaddr, M_DEVBUF);
 	else {
 		contigfree(vaddr, dmat->maxsize, M_DEVBUF);
@@ -1086,15 +1094,13 @@ alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
 		struct bounce_page *bpage;
 
 		bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF,
-						     M_NOWAIT | M_ZERO);
-
+		    M_NOWAIT | M_ZERO);
 		if (bpage == NULL)
 			break;
 		bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
-							 M_NOWAIT, 0ul,
-							 bz->lowaddr,
-							 PAGE_SIZE,
-							 0);
+		    M_NOWAIT,
+		    (dmat->flags & BUS_DMA_NO_PAGEZERO) != 0 ? PAGE_SIZE : 0,
+		    bz->lowaddr, PAGE_SIZE, 0);
 		if (bpage->vaddr == 0) {
 			free(bpage, M_DEVBUF);
 			break;