linux-2.6.33/dma_map_single(arm) の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-2.6.33/dma_map_single(arm) へ行く。
  • 1 (2011-06-10 (金) 18:00:12)

参照元†

• linux-2.6.33/dma_map_single()

説明†

• パス: [[linux-2.6.33/]]

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-2.6.33/device
• void *cpu_addr
• size_t size
• enum dma_data_direction dir
  • linux-2.6.33/dma_data_direction

返り値†

• dma_addr_t

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));

• • linux-2.6.33/BUG_ON()
  • linux-2.6.33/valid_dma_direction()

	if (!arch_is_coherent())
		dma_cache_maint(cpu_addr, size, dir);

• • linux-2.6.33/arch_is_coherent()
  • linux-2.6.33/dma_cache_main()

	return virt_to_dma(dev, cpu_addr);

• • linux-2.6.33/virt_to_dma()

}

コメント†