summaryrefslogtreecommitdiffstats
path: root/arch/ia64/include/asm/scatterlist.h
blob: d6f57874041d0f80e351dcfeafb27aed21d755a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
#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 {
#ifdef CONFIG_DEBUG_SG
	unsigned long sg_magic;
#endif
	unsigned long page_link;
	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 */
OpenPOWER on IntegriCloud