1 /* $OpenBSD: i8237reg.h,v 1.3 1999/08/04 23:07:49 niklas Exp $ */ 2 /* $NetBSD: i8237reg.h,v 1.5 1996/03/01 22:27:09 mycroft Exp $ */ 3 4 /* 5 * Intel 8237 DMA Controller 6 */ 7 8 #define DMA37MD_DEMAND 0x00 /* demand mode */ 9 #define DMA37MD_WRITE 0x04 /* read the device, write memory operation */ 10 #define DMA37MD_READ 0x08 /* write the device, read memory operation */ 11 #define DMA37MD_LOOP 0x10 /* auto-initialize mode */ 12 #define DMA37MD_SINGLE 0x40 /* single pass 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