| #ifndef _LINUX_IOMMU_HELPER_H | |
| #define _LINUX_IOMMU_HELPER_H | |
| #include <linux/kernel.h> | |
| static inline unsigned long iommu_device_max_index(unsigned long size, | |
| unsigned long offset, | |
| u64 dma_mask) | |
| { | |
| if (size + offset > dma_mask) | |
| return dma_mask - offset + 1; | |
| else | |
| return size; | |
| } | |
| extern int iommu_is_span_boundary(unsigned int index, unsigned int nr, | |
| unsigned long shift, | |
| unsigned long boundary_size); | |
| extern 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); | |
| static inline unsigned long iommu_num_pages(unsigned long addr, | |
| unsigned long len, | |
| unsigned long io_page_size) | |
| { | |
| unsigned long size = (addr & (io_page_size - 1)) + len; | |
| return DIV_ROUND_UP(size, io_page_size); | |
| } | |
| #endif |