blob: 4bca8a28546c2474e6300d041e117186175dc0ea [file] [log] [blame]
#include <asm/types.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_set_buf(sg, some_ptr, length);
* and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
struct scatterlist {
unsigned long sg_magic;
unsigned long page_link;
unsigned int offset; /* for highmem, page offset */
dma_addr_t dma_address;
unsigned int length;
* These macros should be used after a pci_map_sg call has been done
* to get bus addresses of each of the SG entries and their lengths.
* You should only work with the number of sg entries pci_map_sg
* returns, or alternatively stop on the first sg_dma_len(sg) which
* is 0.
#define sg_dma_address(sg) ((sg)->dma_address)
#define sg_dma_len(sg) ((sg)->length)
#define ISA_DMA_THRESHOLD (0xffffffffUL)
#endif /* !_ASM_SCATTERLIST_H */