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uintptr_t pa; /**< physical address of buffer */
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uintptr_t ba; /**< bus address of buffer (if it is mapped for DMA operations) */
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size_t size; /**< size of the buffer in bytes */
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size_t alignment_offset; /**< we may request alignment of allocated buffers. To enusre proper alignment the larger buffer will be allocated and the offset will specify the first position in the buffer fullfilling alignment request */