27 строки
737 B
C
27 строки
737 B
C
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#ifndef _BLACKFIN_SCATTERLIST_H
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#define _BLACKFIN_SCATTERLIST_H
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#include <linux/mm.h>
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struct scatterlist {
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struct page *page;
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unsigned int offset;
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dma_addr_t dma_address;
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unsigned int length;
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};
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/*
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* These macros should be used after a pci_map_sg call has been done
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* to get bus addresses of each of the SG entries and their lengths.
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* You should only work with the number of sg entries pci_map_sg
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* returns, or alternatively stop on the first sg_dma_len(sg) which
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* is 0.
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*/
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#define sg_address(sg) (page_address((sg)->page) + (sg)->offset)
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#define sg_dma_address(sg) ((sg)->dma_address)
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#define sg_dma_len(sg) ((sg)->length)
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#define ISA_DMA_THRESHOLD (0xffffffff)
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#endif /* !(_BLACKFIN_SCATTERLIST_H) */
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