| #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 */ |