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1#ifndef _ASM_SCATTERLIST_H
2#define _ASM_SCATTERLIST_H
3
4/*
5 * Drivers must set either ->address or (preferred) ->page and ->offset
6 * to indicate where data must be transferred to/from.
7 *
8 * Using ->page is recommended since it handles highmem data as well as
9 * low mem. ->address is restricted to data which has a virtual mapping, and
10 * it will go away in the future. Updating to ->page can be automated very
11 * easily -- something like
12 *
13 * sg->address = some_ptr;
14 *
15 * can be rewritten as
16 *
17 * sg->page = virt_to_page(some_ptr);
18 * sg->offset = (unsigned long) some_ptr & ~PAGE_MASK;
19 *
20 * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
21 */
22struct scatterlist {
23 struct page *page; /* Location for highmem page, if any */
24 unsigned int offset; /* for highmem, page offset */
25
26 dma_addr_t dma_address;
27 unsigned int length;
28};
29
30#define ISA_DMA_THRESHOLD (0xffffffffUL)
31
32#endif /* !_ASM_SCATTERLIST_H */