2 * IOMMU helper functions for the free area management
5 #include <linux/export.h>
6 #include <linux/bitmap.h>
9 int iommu_is_span_boundary(unsigned int index
, unsigned int nr
,
11 unsigned long boundary_size
)
13 BUG_ON(!is_power_of_2(boundary_size
));
15 shift
= (shift
+ index
) & (boundary_size
- 1);
16 return shift
+ nr
> boundary_size
;
19 unsigned long iommu_area_alloc(unsigned long *map
, unsigned long size
,
20 unsigned long start
, unsigned int nr
,
21 unsigned long shift
, unsigned long boundary_size
,
22 unsigned long align_mask
)
26 /* We don't want the last of the limit */
29 index
= bitmap_find_next_zero_area(map
, size
, start
, nr
, align_mask
);
31 if (iommu_is_span_boundary(index
, nr
, shift
, boundary_size
)) {
32 /* we could do more effectively */
36 bitmap_set(map
, index
, nr
);
41 EXPORT_SYMBOL(iommu_area_alloc
);
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