2 * Intel 8237 DMA Controller
4 * $FreeBSD: src/sys/i386/isa/ic/i8237.h,v 1.7 1999/08/28 00:45:14 peter Exp $
5 * $DragonFly: src/sys/platform/pc32/isa/ic/i8237.h,v 1.2 2003/06/17 04:28:37 dillon Exp $
8 #define DMA37MD_SINGLE 0x40 /* single pass mode */
9 #define DMA37MD_CASCADE 0xc0 /* cascade mode */
10 #define DMA37MD_AUTO 0x50 /* autoinitialise single pass mode */
11 #define DMA37MD_WRITE 0x04 /* read the device, write memory operation */
12 #define DMA37MD_READ 0x08 /* write the device, read memory operation */