[deliverable/linux.git] / include / asm-ia64 / scatterlist.h

#ifndef _ASM_IA64_SCATTERLIST_H
#define _ASM_IA64_SCATTERLIST_H

/*
 * Modified 1998-1999, 2001-2002, 2004
 *	David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
 */

#include <asm/types.h>

struct scatterlist {
	struct page *page;
	unsigned int offset;
	unsigned int length;	/* buffer length */

	dma_addr_t dma_address;
	unsigned int dma_length;
};

/*
 * It used to be that ISA_DMA_THRESHOLD had something to do with the
 * DMA-limits of ISA-devices.  Nowadays, its only remaining use (apart
 * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
 * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
 * address of a page is that is allocated with GFP_DMA.  On IA-64,
 * that's 4GB - 1.
 */
#define ISA_DMA_THRESHOLD	0xffffffff

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

#define	ARCH_HAS_SG_CHAIN

#endif /* _ASM_IA64_SCATTERLIST_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_IA64_SCATTERLIST_H
	2	#define _ASM_IA64_SCATTERLIST_H
	3
	4	/*
	5	* Modified 1998-1999, 2001-2002, 2004
	6	* David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
	7	*/
	8
a9dfd281 JD	9	#include <asm/types.h>
a9dfd281 JD	10
1da177e4 LT	11	struct scatterlist {
	12	struct page *page;
	13	unsigned int offset;
	14	unsigned int length; /* buffer length */
	15
	16	dma_addr_t dma_address;
	17	unsigned int dma_length;
	18	};
	19
	20	/*
	21	* It used to be that ISA_DMA_THRESHOLD had something to do with the
	22	* DMA-limits of ISA-devices. Nowadays, its only remaining use (apart
	23	* from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
	24	* tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
	25	* address of a page is that is allocated with GFP_DMA. On IA-64,
	26	* that's 4GB - 1.
	27	*/
	28	#define ISA_DMA_THRESHOLD 0xffffffff
	29
7806ca89 TL	30	#define sg_dma_len(sg) ((sg)->dma_length)
	31	#define sg_dma_address(sg) ((sg)->dma_address)
	32
9b6eccfc JA	33	#define ARCH_HAS_SG_CHAIN
9b6eccfc JA	34
1da177e4	35	#endif /* _ASM_IA64_SCATTERLIST_H */