iommu-helper.rar_Free!

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