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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __ASM_SCATTERLIST_H
2#define __ASM_SCATTERLIST_H
3
Jean Delvarea9dfd282007-03-06 02:45:12 -08004#include <asm/types.h>
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006struct scatterlist {
7 struct page * page;
8 unsigned int offset;
9 dma_addr_t dma_address;
10 unsigned int length;
11};
12
13/*
14 * These macros should be used after a pci_map_sg call has been done
15 * to get bus addresses of each of the SG entries and their lengths.
16 * You should only work with the number of sg entries pci_map_sg
17 * returns, or alternatively stop on the first sg_dma_len(sg) which
18 * is 0.
19 */
20#define sg_dma_address(sg) ((sg)->dma_address)
21#define sg_dma_len(sg) ((sg)->length)
22
23#define ISA_DMA_THRESHOLD (0x00ffffffUL)
24
25#endif /* __ASM_SCATTERLIST_H */