/* * Intel 8237 DMA Controller * * $FreeBSD: src/sys/dev/ic/i8237.h,v 1.8 2001/06/30 05:29:11 imp 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 */