1/* $NetBSD: i8237reg.h,v 1.6.56.1 2005/03/04 16:41:28 skrll Exp $ */ 2 3/* 4 * Intel 8237 DMA Controller 5 */ 6 7#define DMA37MD_WRITE 0x04 /* read the device, write memory operation */ 8#define DMA37MD_READ 0x08 /* write the device, read memory operation */ 9#define DMA37MD_LOOP 0x10 /* auto-initialize mode */ 10#define DMA37MD_DEMAND 0x00 /* demand mode */ 11#define DMA37MD_SINGLE 0x40 /* single mode */ 12#define DMA37MD_BLOCK 0x80 /* block mode */ 13#define DMA37MD_CASCADE 0xc0 /* cascade mode */ 14 15#define DMA37SM_CLEAR 0x00 /* clear mask bit */ 16#define DMA37SM_SET 0x04 /* set mask bit */ 17