1 /* 2 * Intel 8237 DMA Controller 3 * 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/pc64/isa/ic/i8237.h,v 1.1 2008/08/29 17:07:21 dillon Exp $ 6 */ 7 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 */ 13 14