#ifndef __ASM_GENERIC_SCATTERLIST_H #define __ASM_GENERIC_SCATTERLIST_H #include <linux/types.h> struct scatterlist { #ifdef CONFIG_DEBUG_SG unsigned long sg_magic; #endif unsigned long page_link; unsigned int offset; unsigned int length; dma_addr_t dma_address; unsigned int dma_length; }; /* * These macros should be used after a dma_map_sg call has been done * to get bus addresses of each of the SG entries and their lengths. * You should only work with the number of sg entries pci_map_sg * returns, or alternatively stop on the first sg_dma_len(sg) which * is 0. */ #define sg_dma_address(sg) ((sg)->dma_address) #ifndef sg_dma_len /* * Normally, you have an iommu on 64 bit machines, but not on 32 bit * machines. Architectures that are differnt should override this. */ #if __BITS_PER_LONG == 64 #define sg_dma_len(sg) ((sg)->dma_length) #else #define sg_dma_len(sg) ((sg)->length) #endif /* 64 bit */ #endif /* sg_dma_len */ #ifndef ISA_DMA_THRESHOLD #define ISA_DMA_THRESHOLD (~0UL) #endif #define ARCH_HAS_SG_CHAIN #endif /* __ASM_GENERIC_SCATTERLIST_H */