#ifndef _ASM_X86_SCATTERLIST_H #define _ASM_X86_SCATTERLIST_H #include <asm/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; #ifdef CONFIG_X86_64 unsigned int dma_length; #endif }; #define ARCH_HAS_SG_CHAIN #define ISA_DMA_THRESHOLD (0x00ffffff) /* * These macros should be used after a pci_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. */ #define sg_dma_address(sg) ((sg)->dma_address) #ifdef CONFIG_X86_32 # define sg_dma_len(sg) ((sg)->length) #else # define sg_dma_len(sg) ((sg)->dma_length) #endif #endif