1 /* 2 * Intel 8237 DMA Controller 3 */ 4 5 #define DMA37MD_SINGLE 0x40 /* single pass mode */ 6 #define DMA37MD_CASCADE 0xc0 /* cascade mode */ 7 #define DMA37MD_WRITE 0x04 /* read the device, write memory operation */ 8 #define DMA37MD_READ 0x08 /* write the device, read memory operation */ 9 10