| #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) */ |
