blob: 834a189ef1898368e91c525fa3c4a228cc256478 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
9struct scatterlist {
10 struct page *page;
11 unsigned int offset;
12 unsigned int length; /* buffer length */
13
14 dma_addr_t dma_address;
15 unsigned int dma_length;
16};
17
18/*
19 * It used to be that ISA_DMA_THRESHOLD had something to do with the
20 * DMA-limits of ISA-devices. Nowadays, its only remaining use (apart
21 * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
22 * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
23 * address of a page is that is allocated with GFP_DMA. On IA-64,
24 * that's 4GB - 1.
25 */
26#define ISA_DMA_THRESHOLD 0xffffffff
27
28#endif /* _ASM_IA64_SCATTERLIST_H */