kernel/device_manager/dma_resources.cpp

56 	generic_io_vec& vec = fVecs[fVecCount++];
57 	vec.base = base;
58 	vec.length = size;
309 		generic_io_vec& vec = buffer.VecAt(i);
310 		generic_size_t length = vec.length;
322 			vec.length -= toCut;
362 		// see if we can join the bounce buffer with the previously last vec
363 		generic_io_vec& vec = buffer.VecAt(vecCount - 1);
364 		generic_addr_t vecBase = vec.base;
365 		generic_size_t vecLength = vec.length;
371 			generic_size_t lengthDiff = vecLength - vec.length;
378 			vec.length = vecLength;
383 		// We need to add another bounce vec
452 				generic_io_vec& vec = buffer->VecAt(i);
453 				generic_addr_t base = vec.base + vecOffset;
454 				generic_size_t size = vec.length - vecOffset;
517 	// gap to the start of the vec.
554 		const generic_io_vec& vec = vecs[i];
555 		if (vec.length <= vecOffset) {
556 			vecOffset -= vec.length;
561 		generic_addr_t base = vec.base + vecOffset;
562 		generic_size_t maxLength = vec.length - vecOffset;
567 		// Cut the vec according to transfer size, segment size, and boundary.
571 			TRACE("  vec %" B_PRIu32 ": restricting length to %lu due to transfer size "
579 		// Check alignment: if not aligned, use bounce buffer for complete vec.
582 			TRACE("  vec %" B_PRIu32 ": below low address, using bounce buffer: %lu\n", i,
586 			TRACE("  vec %" B_PRIu32 ": misalignment, using bounce buffer: %lu\n", i,
600 		// If length is 0, use bounce buffer for complete vec.
604 			TRACE("  vec %" B_PRIu32 ": 0 length, using bounce buffer: %lu\n", i,
616 				TRACE("  vec %" B_PRIu32 ": out of bounce buffer space\n", i);
621 			TRACE("  vec %" B_PRIu32 ": final bounce length: %lu\n", i, length);
623 			TRACE("  vec %" B_PRIu32 ": final length restriction: %lu\n", i, length);
641 		// vec is a bounce buffer segment shorter than the block size. If so, we
651 				// We can be certain that the last vec is a bounce buffer vec,
687 		// TODO: sometimes we can replace the last vec with the bounce buffer