IOMMU_PAGE_OFFSET
pg_offset &= IOMMU_PAGE_OFFSET;
offset = (ulong_t)vaddr & IOMMU_PAGE_OFFSET;
pg_off = dvma_addr & IOMMU_PAGE_OFFSET; /* offset in 1st pg */
offset = (uint32_t)(uintptr_t)a & IOMMU_PAGE_OFFSET;
ASSERT(!(win_size & IOMMU_PAGE_OFFSET));
#define IOMMU_BTOPR(x) IOMMU_BTOP((x) + IOMMU_PAGE_OFFSET)