The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/lib/iommu-helper.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
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    1 /*
    2  * IOMMU helper functions for the free area management
    3  */
    4 
    5 #include <linux/export.h>
    6 #include <linux/bitmap.h>
    7 #include <linux/bug.h>
    8 
    9 int iommu_is_span_boundary(unsigned int index, unsigned int nr,
   10                            unsigned long shift,
   11                            unsigned long boundary_size)
   12 {
   13         BUG_ON(!is_power_of_2(boundary_size));
   14 
   15         shift = (shift + index) & (boundary_size - 1);
   16         return shift + nr > boundary_size;
   17 }
   18 
   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)
   23 {
   24         unsigned long index;
   25 
   26         /* We don't want the last of the limit */
   27         size -= 1;
   28 again:
   29         index = bitmap_find_next_zero_area(map, size, start, nr, align_mask);
   30         if (index < size) {
   31                 if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
   32                         /* we could do more effectively */
   33                         start = index + 1;
   34                         goto again;
   35                 }
   36                 bitmap_set(map, index, nr);
   37                 return index;
   38         }
   39         return -1;
   40 }
   41 EXPORT_SYMBOL(iommu_area_alloc);

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