| #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; |
| #ifdef CONFIG_NEED_SG_DMA_LENGTH |
| unsigned int dma_length; |
| #endif |
| }; |
| |
| /* |
| * 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) |
| |
| #ifdef CONFIG_NEED_SG_DMA_LENGTH |
| #define sg_dma_len(sg) ((sg)->dma_length) |
| #else |
| #define sg_dma_len(sg) ((sg)->length) |
| #endif |
| |
| #endif /* __ASM_GENERIC_SCATTERLIST_H */ |