x86/isa/isa_dma.c

45  * isa_dmastart()
71 static u_int8_t	dma_busy = 0;		/* Used in isa_dmastart() */
226  * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
230 isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
241 		panic("isa_dmastart: channel out of range");
245 		panic("isa_dmastart: impossible request");
249 		printf("isa_dmastart: channel %d not acquired\n", chan);
257 	 * isa_dmastart() once because they use Auto DMA mode.  If we
261 		printf("isa_dmastart: channel %d busy\n", chan);
269 			panic("isa_dmastart: bad bounce buffer");