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#ifndef _I386_SCATTERLIST_H
#define _I386_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 {
    char *  address;    /* Location data is to be transferred to, NULL for
			 * highmem page */
    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 (0x00ffffff)
 
#endif /* !(_I386_SCATTERLIST_H) */