scatterlist.h

《嵌入式系统设计与实例开发实验教材二源码》Linux内核移植与编译实验

#ifndef _ALPHA_SCATTERLIST_H
#define _ALPHA_SCATTERLIST_H

#include <asm/page.h>
  
struct scatterlist {
	/* This will disappear in 2.5.x */
	char *address;

	/* These two are only valid if ADDRESS member of this
	   struct is NULL.  */
	struct page *page;
	unsigned int offset;

	unsigned int length;

	dma_addr_t dma_address;
	__u32 dma_length;
};

#define sg_dma_address(sg)	((sg)->dma_address)
#define sg_dma_len(sg)		((sg)->dma_length)

#define ISA_DMA_THRESHOLD (~0UL)

#endif /* !(_ALPHA_SCATTERLIST_H) */