1 #ifndef __ASM_SCATTERLIST_H 2 #define __ASM_SCATTERLIST_H 3 4 #include <asm/types.h> 5 6 struct 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