1999/0504/alphapc/dma.c (diff list | history)

1999/0501/sys/src/9/alphapc/dma.c:107,112 – 1999/0504/sys/src/9/alphapc/dma.c:107,142 (short | long | prev | next)
1999/0423		return 0;
1999/0415		}
1999/0504		static void dmastatus(DMA *dp, int chan) { int a, l, s; ilock(dp); outb(dp->cbp, 0); a = inb(dp->addr[chan]); a |= inb(dp->addr[chan])<<8; a |= inb(dp->page[chan])<<16; a |= inb(0x400|dp->page[chan])<<24; outb(dp->cbp, 0); l = inb(dp->count[chan]); l |= inb(dp->count[chan])<<8; s = inb(dp->cmd); iunlock(dp); print("addr %uX len %uX stat %uX\n", a, l, s); } void xdmastatus(int chan) { DMA *dp; dp = &dma[(chan>>2)&1]; chan = chan & 3; dmastatus(dp, chan); }
1999/0415		/* * setup a dma transfer. if the destination is not in kernel * memory, allocate a page for the transfer.
1999/0501/sys/src/9/alphapc/dma.c:174,184 – 1999/0504/sys/src/9/alphapc/dma.c:204,215
1999/0501		#ifdef tryPCI outb(0x400|dp->page[chan], pa>>24); #endif /* tryPCI */
1999/0504		outb(dp->cbp, 0); /* set count & address to their first byte */
1999/0415		outb(dp->count[chan], (len>>dp->shift)-1); /* set count */ outb(dp->count[chan], ((len>>dp->shift)-1)>>8); outb(dp->sbm, chan); /* enable the channel */ iunlock(dp);
1999/0501		//print("pa%lux+", pa);
1999/0504		dmastatus(dp, chan);
1999/0415		return len; }
1999/0501/sys/src/9/alphapc/dma.c:210,215 – 1999/0504/sys/src/9/alphapc/dma.c:241,247
1999/0415		dp = &dma[(chan>>2)&1]; chan = chan & 3;
1999/0504		dmastatus(dp, chan);
1999/0415		/* * disable the channel */
1999/0501/sys/src/9/alphapc/dma.c:216,230 – 1999/0504/sys/src/9/alphapc/dma.c:248,253
1999/0415		ilock(dp); outb(dp->sbm, 4|chan); iunlock(dp);
1999/0424		{ int i; outb(dp->cbp, 0); i = inb(dp->addr[chan]); i |= inb(dp->addr[chan])<<8; i |= inb(dp->page[chan])<<16; i |= inb(0x400|dp->page[chan])<<24;
1999/0501		//print("X%uX+", i);
1999/0424		}
1999/0415		xp = &dp->x[chan]; if(xp->len == 0 || !xp->isread)