NetBSD/sys/dev/ic/i8237reg.h

17 lines
580 B
C

/* $NetBSD: i8237reg.h,v 1.8 2005/12/11 12:21:26 christos Exp $ */
/*
* Intel 8237 DMA Controller
*/
#define DMA37MD_WRITE 0x04 /* read the device, write memory operation */
#define DMA37MD_READ 0x08 /* write the device, read memory operation */
#define DMA37MD_LOOP 0x10 /* auto-initialize mode */
#define DMA37MD_DEMAND 0x00 /* demand mode */
#define DMA37MD_SINGLE 0x40 /* single mode */
#define DMA37MD_BLOCK 0x80 /* block mode */
#define DMA37MD_CASCADE 0xc0 /* cascade mode */
#define DMA37SM_CLEAR 0x00 /* clear mask bit */
#define DMA37SM_SET 0x04 /* set mask bit */