kernels/linux-2.4.0/include/asm-i386/pci.h
/* Map a single buffer of the indicated size for DMA in streaming mode.
 * The 32-bit bus address to use is returned.
 *
 * Once the device is given the dma address, the device owns this memory
 * until either pci_unmap_single or pci_dma_sync_single is performed.
 */
Map a single buffer of the indicated size for DMA in streaming mode.
The 32-bit bus address to use is returned.

Once the device is given the dma address, the device owns this memory
until either pci_unmap_single or pci_dma_sync_single is performed.
Map a single buffer of the indicated size for DMA in streaming mode . The 32 - bit bus address to use is returned . Once the device is given the dma address the device owns this memory until either pci_unmap_single or pci_dma_sync_single is performed .
extern inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
					size_t size, int direction)
{
	if (direction == PCI_DMA_NONE)
		BUG();
	return virt_to_bus(ptr);
}
extern inline dma_addr_t pci_map_single ( struct pci_dev * hwdev , void * ptr , size_t size , int direction ) { if ( direction == PCI_DMA_NONE ) BUG ( ) ; return virt_to_bus ( ptr ) ; }
Map a single buffer of the indicated size for DMA in streaming mode.
Map a single buffer of the indicated size for DMA in streaming mode .