psb_gtt_mask_pte
pte = psb_gtt_mask_pte(pfn_base + i, PSB_MMU_CACHED_MEMORY);
pte = psb_gtt_mask_pte(page_to_pfn(pdev->scratch_page), PSB_MMU_CACHED_MEMORY);
pte = psb_gtt_mask_pte(pfn_base, PSB_MMU_CACHED_MEMORY);
pte = psb_gtt_mask_pte(page_to_pfn(pages[i]), PSB_MMU_CACHED_MEMORY);
uint32_t psb_gtt_mask_pte(uint32_t pfn, int type);