1 /* $NetBSD: i8237reg.h,v 1.6 1997/05/29 21:42:28 mycroft 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