| Arnd Bergmann | aafe4db | 2009-05-13 22:56:33 +0000 | [diff] [blame] | 1 | #ifndef __ASM_GENERIC_SCATTERLIST_H |
| 2 | #define __ASM_GENERIC_SCATTERLIST_H |
| 3 | |
| 4 | #include <linux/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 | unsigned int length; |
| 13 | dma_addr_t dma_address; |
| 14 | unsigned int dma_length; |
| 15 | }; |
| 16 | |
| 17 | /* |
| 18 | * These macros should be used after a dma_map_sg call has been done |
| 19 | * to get bus addresses of each of the SG entries and their lengths. |
| 20 | * You should only work with the number of sg entries pci_map_sg |
| 21 | * returns, or alternatively stop on the first sg_dma_len(sg) which |
| 22 | * is 0. |
| 23 | */ |
| 24 | #define sg_dma_address(sg) ((sg)->dma_address) |
| 25 | #ifndef sg_dma_len |
| 26 | /* |
| 27 | * Normally, you have an iommu on 64 bit machines, but not on 32 bit |
| 28 | * machines. Architectures that are differnt should override this. |
| 29 | */ |
| 30 | #if __BITS_PER_LONG == 64 |
| 31 | #define sg_dma_len(sg) ((sg)->dma_length) |
| 32 | #else |
| 33 | #define sg_dma_len(sg) ((sg)->length) |
| 34 | #endif /* 64 bit */ |
| 35 | #endif /* sg_dma_len */ |
| 36 | |
| 37 | #ifndef ISA_DMA_THRESHOLD |
| 38 | #define ISA_DMA_THRESHOLD (~0UL) |
| 39 | #endif |
| 40 | |
| 41 | #define ARCH_HAS_SG_CHAIN |
| 42 | |
| 43 | #endif /* __ASM_GENERIC_SCATTERLIST_H */ |