scatterlist.h

来自「linux 内核源代码」· C头文件 代码 · 共 29 行

#ifndef _BLACKFIN_SCATTERLIST_H
#define _BLACKFIN_SCATTERLIST_H

#include <linux/mm.h>

struct scatterlist {
#ifdef CONFIG_DEBUG_SG
	unsigned long sg_magic;
#endif
	unsigned long page_link;
	unsigned int 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	(0xffffffff)

#endif				/* !(_BLACKFIN_SCATTERLIST_H) */