1 #ifndef __ASM_GENERIC_SCATTERLIST_H
2 #define __ASM_GENERIC_SCATTERLIST_H
4 #include <linux/types.h>
8 unsigned long sg_magic
;
10 unsigned long page_link
;
13 dma_addr_t dma_address
;
14 unsigned int dma_length
;
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
24 #define sg_dma_address(sg) ((sg)->dma_address)
27 * Normally, you have an iommu on 64 bit machines, but not on 32 bit
28 * machines. Architectures that are differnt should override this.
30 #if __BITS_PER_LONG == 64
31 #define sg_dma_len(sg) ((sg)->dma_length)
33 #define sg_dma_len(sg) ((sg)->length)
35 #endif /* sg_dma_len */
37 #ifndef ISA_DMA_THRESHOLD
38 #define ISA_DMA_THRESHOLD (~0UL)
41 #define ARCH_HAS_SG_CHAIN
43 #endif /* __ASM_GENERIC_SCATTERLIST_H */
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