参照元

説明

引数

返り値

参考

実装

/**
 * dma_map_single - map a single buffer for streaming DMA
 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 * @cpu_addr: CPU direct mapped address of buffer
 * @size: size of buffer to map
 * @dir: DMA transfer direction
 *
 * Ensure that any data held in the cache is appropriately discarded
 * or written back.
 *
 * The device owns this memory once this call has completed.  The CPU
 * can regain ownership by calling dma_unmap_single() or
 * dma_sync_single_for_cpu().
 */
static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
		size_t size, enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
	if (!arch_is_coherent())
		dma_cache_maint(cpu_addr, size, dir);
	return virt_to_dma(dev, cpu_addr);
}

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Last-modified: 2014-09-13 (土) 08:26:41