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Linux kernel mirror (for testing)
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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
9#include <asm/types.h>
10
11struct scatterlist {
12#ifdef CONFIG_DEBUG_SG
13 unsigned long sg_magic;
14#endif
15 unsigned long page_link;
16 unsigned int offset;
17 unsigned int length; /* buffer length */
18
19 dma_addr_t dma_address;
20 unsigned int dma_length;
21};
22
23/*
24 * It used to be that ISA_DMA_THRESHOLD had something to do with the
25 * DMA-limits of ISA-devices. Nowadays, its only remaining use (apart
26 * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
27 * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
28 * address of a page is that is allocated with GFP_DMA. On IA-64,
29 * that's 4GB - 1.
30 */
31#define ISA_DMA_THRESHOLD 0xffffffff
32
33#define sg_dma_len(sg) ((sg)->dma_length)
34#define sg_dma_address(sg) ((sg)->dma_address)
35
36#define ARCH_HAS_SG_CHAIN
37
38#endif /* _ASM_IA64_SCATTERLIST_H */