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#ifndef _ASM_SCATTERLIST_H
#define _ASM_SCATTERLIST_H
/*
* Drivers must set either ->address or (preferred) ->page and ->offset
* to indicate where data must be transferred to/from.
*
* Using ->page is recommended since it handles highmem data as well as
* low mem. ->address is restricted to data which has a virtual mapping, and
* it will go away in the future. Updating to ->page can be automated very
* easily -- something like
*
* sg->address = some_ptr;
*
* can be rewritten as
*
* sg->page = virt_to_page(some_ptr);
* sg->offset = (unsigned long) some_ptr & ~PAGE_MASK;
*
* and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
*/
struct scatterlist {
struct page *page; /* Location for highmem page, if any */
unsigned int offset; /* for highmem, page offset */
dma_addr_t dma_address;
unsigned int length;
};
#define ISA_DMA_THRESHOLD (0xffffffffUL)
#endif /* !_ASM_SCATTERLIST_H */
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