Subversion Repositories or1k

#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) */