| * IOMMU helper functions for the free area management |
| #include <linux/export.h> |
| #include <linux/bitmap.h> |
| int iommu_is_span_boundary(unsigned int index, unsigned int nr, |
| unsigned long boundary_size) |
| BUG_ON(!is_power_of_2(boundary_size)); |
| shift = (shift + index) & (boundary_size - 1); |
| return shift + nr > boundary_size; |
| unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, |
| unsigned long start, unsigned int nr, |
| unsigned long shift, unsigned long boundary_size, |
| unsigned long align_mask) |
| /* We don't want the last of the limit */ |
| index = bitmap_find_next_zero_area(map, size, start, nr, align_mask); |
| if (iommu_is_span_boundary(index, nr, shift, boundary_size)) { |
| /* we could do more effectively */ |
| bitmap_set(map, index, nr); |
| EXPORT_SYMBOL(iommu_area_alloc); |