blob: 51a7a43ab0ceea1d7a8949522db71a16600ce10a (
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
39
|
#ifndef __ASM_GENERIC_SCATTERLIST_H
#define __ASM_GENERIC_SCATTERLIST_H
#include <linux/types.h>
struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link;
unsigned int offset;
unsigned int length;
dma_addr_t dma_address;
unsigned int dma_length;
};
/*
* These macros should be used after a dma_map_sg call has been done
* to get bus addresses of each of the SG entries and their lengths.
* You should only work with the number of sg entries pci_map_sg
* returns, or alternatively stop on the first sg_dma_len(sg) which
* is 0.
*/
#define sg_dma_address(sg) ((sg)->dma_address)
#ifndef sg_dma_len
/*
* Normally, you have an iommu on 64 bit machines, but not on 32 bit
* machines. Architectures that are differnt should override this.
*/
#if __BITS_PER_LONG == 64
#define sg_dma_len(sg) ((sg)->dma_length)
#else
#define sg_dma_len(sg) ((sg)->length)
#endif /* 64 bit */
#endif /* sg_dma_len */
#define ARCH_HAS_SG_CHAIN
#endif /* __ASM_GENERIC_SCATTERLIST_H */
|
