pci/ivtv/ivtv-udma.c

14 void ivtv_udma_get_page_info(struct ivtv_dma_page_info *dma_page, unsigned long first, unsigned long size)
16 	dma_page->uaddr = first & PAGE_MASK;
17 	dma_page->offset = first & ~PAGE_MASK;
18 	dma_page->tail = 1 + ((first+size-1) & ~PAGE_MASK);
19 	dma_page->first = (first & PAGE_MASK) >> PAGE_SHIFT;
20 	dma_page->last = ((first+size-1) & PAGE_MASK) >> PAGE_SHIFT;
21 	dma_page->page_count = dma_page->last - dma_page->first + 1;
22 	if (dma_page->page_count == 1) dma_page->tail -= dma_page->offset;
25 int ivtv_udma_fill_sg_list (struct ivtv_user_dma *dma, struct ivtv_dma_page_info *dma_page, int map_offset)
33 	offset = dma_page->offset;
36 	for (i = 0; i < dma_page->page_count; i++) {
37 		unsigned int len = (i == dma_page->page_count - 1) ?
38 			dma_page->tail : PAGE_SIZE - offset;