1/* 2 * Intel 8237 DMA Controller 3 * 4 * $FreeBSD: releng/10.2/sys/dev/ic/i8237.h 146214 2005-05-14 10:14:56Z nyan $ 5 */ 6 7#define DMA37MD_SINGLE 0x40 /* single pass mode */ 8#define DMA37MD_CASCADE 0xc0 /* cascade mode */ 9#define DMA37MD_AUTO 0x50 /* autoinitialise single pass mode */ 10#define DMA37MD_WRITE 0x04 /* read the device, write memory operation */ 11#define DMA37MD_READ 0x08 /* write the device, read memory operation */ 12