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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> |
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 | ||
1da177e4 | 33 | #endif /* _ASM_IA64_SCATTERLIST_H */ |