+ iommu->dummy_page = __get_free_pages(GFP_KERNEL, 0);
+ if (!iommu->dummy_page) {
+ prom_printf("PSYCHO_IOMMU: Error, gfp(dummy_page) failed.\n");
+ prom_halt();
+ }
+ memset((void *)iommu->dummy_page, 0, PAGE_SIZE);
+ iommu->dummy_page_pa = (unsigned long) __pa(iommu->dummy_page);
+