scatterlist.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:1k
- #ifndef _ASM_PARISC_SCATTERLIST_H
- #define _ASM_PARISC_SCATTERLIST_H
- #include <asm/page.h>
- struct scatterlist {
- /* This will disappear in 2.5.x */
- char *address;
- /* page/offset only valid if ADDRESS member is NULL.
- ** Needed to support CONFIG_HIGHMEM on x386.
- ** I still think davem is a dork for forcing other
- ** arches to add this to 2.4.x. -ggg
- */
- struct page *page;
- unsigned int offset;
- unsigned int length;
- /* an IOVA can be 64-bits on some PA-Risc platforms. */
- dma_addr_t iova; /* I/O Virtual Address */
- __u32 iova_length; /* bytes mapped */
- };
- #define sg_virt_addr(sg) (((sg)->address) ? ((sg)->address) :
- ((sg)->page->virtual + (sg)->offset))
- #define sg_dma_address(sg) ((sg)->iova)
- #define sg_dma_len(sg) ((sg)->iova_length)
- #define ISA_DMA_THRESHOLD (~0UL)
- #endif /* _ASM_PARISC_SCATTERLIST_H */