14Srgrimes/* 24Srgrimes * Intel 8237 DMA Controller 3619Srgrimes * 450477Speter * $FreeBSD$ 54Srgrimes */ 64Srgrimes 74Srgrimes#define DMA37MD_SINGLE 0x40 /* single pass mode */ 84Srgrimes#define DMA37MD_CASCADE 0xc0 /* cascade mode */ 94051Sache#define DMA37MD_AUTO 0x50 /* autoinitialise single pass mode */ 104Srgrimes#define DMA37MD_WRITE 0x04 /* read the device, write memory operation */ 114Srgrimes#define DMA37MD_READ 0x08 /* write the device, read memory operation */ 12