1#ifndef __ASM_SCATTERLIST_H 2#define __ASM_SCATTERLIST_H 3 4#include <asm/types.h> 5 6struct scatterlist { 7#ifdef CONFIG_DEBUG_SG 8 unsigned long sg_magic; 9#endif 10 unsigned long page_link; 11 unsigned int offset; 12 dma_addr_t dma_address; 13 unsigned int length; 14}; 15 16/* 17 * These macros should be used after a pci_map_sg call has been done 18 * to get bus addresses of each of the SG entries and their lengths. 19 * You should only work with the number of sg entries pci_map_sg 20 * returns, or alternatively stop on the first sg_dma_len(sg) which 21 * is 0. 22 */ 23#define sg_dma_address(sg) ((sg)->dma_address) 24#define sg_dma_len(sg) ((sg)->length) 25 26#define ISA_DMA_THRESHOLD (0x00ffffffUL) 27 28#endif /* __ASM_SCATTERLIST_H */ 29