xref: /freebsd/sys/dev/ic/i8237.h (revision f81cdf24ba5436367377f7c8e8f51f6df2a75ca7)
1 /*
2  * Intel 8237 DMA Controller
3  */
4 
5 #define	DMA37MD_SINGLE	0x40	/* single pass mode */
6 #define	DMA37MD_CASCADE	0xc0	/* cascade mode */
7 #define	DMA37MD_AUTO	0x50	/* autoinitialise single pass mode */
8 #define	DMA37MD_WRITE	0x04	/* read the device, write memory operation */
9 #define	DMA37MD_READ	0x08	/* write the device, read memory operation */
10