freebsd-nq/sys/dev/ic/i8237.h
1994-11-01 17:26:50 +00:00

13 lines
406 B
C

/*
* Intel 8237 DMA Controller
*
* $Id: i8237.h,v 1.2 1993/10/16 13:48:48 rgrimes Exp $
*/
#define DMA37MD_SINGLE 0x40 /* single pass mode */
#define DMA37MD_CASCADE 0xc0 /* cascade mode */
#define DMA37MD_AUTO 0x50 /* autoinitialise single pass mode */
#define DMA37MD_WRITE 0x04 /* read the device, write memory operation */
#define DMA37MD_READ 0x08 /* write the device, read memory operation */