1 #ifndef _ASM_X86_SCATTERLIST_H
2 #define _ASM_X86_SCATTERLIST_H
3
4 #include <asm/types.h>
5
6 struct scatterlist {
7 #ifdef CONFIG_DEBUG_SG
8 unsigned long sg_magic;
9 #endif
10 unsigned long page_link;
11 unsigned int offset;
12 unsigned int length;
13 dma_addr_t dma_address;
14 unsigned int dma_length;
15 };
16
17 #define ARCH_HAS_SG_CHAIN
18 #define ISA_DMA_THRESHOLD (0x00ffffff)
19
20 /*
21 * These macros should be used after a pci_map_sg call has been done
22 * to get bus addresses of each of the SG entries and their lengths.
23 * You should only work with the number of sg entries pci_map_sg
24 * returns.
25 */
26 #define sg_dma_address(sg) ((sg)->dma_address)
27 #ifdef CONFIG_X86_32
28 # define sg_dma_len(sg) ((sg)->length)
29 #else
30 # define sg_dma_len(sg) ((sg)->dma_length)
31 #endif
32
33 #endif /* _ASM_X86_SCATTERLIST_H */
34
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