1994/1206/pc/dma.c (diff list | history)

1994/1206/sys/src/9/pc/dma.c:56,68 – 1995/0214/sys/src/9/pc/dma.c:56,67 (short | long | prev | next)
1991/0803		uchar mc; /* master clear */ uchar cmask; /* clear mask register */ uchar wam; /* write all mask register bit */                  Lock; }; struct DMA { DMAport;
1995/0214		int shift;
1991/0803		Lock; DMAxfer x[4]; };
1994/1206/sys/src/9/pc/dma.c:71,81 – 1995/0214/sys/src/9/pc/dma.c:70,83
1991/0803		{ 0x00, 0x02, 0x04, 0x06, 0x01, 0x03, 0x05, 0x07, 0x87, 0x83, 0x81, 0x82, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, { 0xc0, 0xc6, 0xca, 0xce, 0xc4, 0xc8, 0xcc, 0xcf, 0x80, 0x8b, 0x89, 0x8a, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde },
1995/0214		0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0 }, { 0xc0, 0xc4, 0xc8, 0xcc, 0xc2, 0xc6, 0xca, 0xce, 0x8f, 0x8b, 0x89, 0x8a, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, 1 },
1991/0803		}; /*
1994/1206/sys/src/9/pc/dma.c:95,100 – 1995/0214/sys/src/9/pc/dma.c:97,104
1993/0915		xp = &dp->x[chan]; xp->pg.pa = (ulong)xspanalloc(BY2PG, BY2PG, 0); xp->pg.va = KZERO|xp->pg.pa;
1995/0214		xp->len = 0; xp->isread = 0;
1993/0915		} } }
1994/1206/sys/src/9/pc/dma.c:143,159 – 1995/0214/sys/src/9/pc/dma.c:147,163
1991/0803		/* * this setup must be atomic */ lock(dp); outb(dp->cbp, 0); /* set count & address to their first byte */
1995/0214		ilock(dp);
1991/0803		mode = (isread ? 0x44 : 0x48) | chan; outb(dp->mode, mode); /* single mode dma (give CPU a chance at mem) */ outb(dp->addr[chan], pa); /* set address */ outb(dp->addr[chan], pa>>8); outb(dp->page[chan], pa>>16); outb(dp->count[chan], len-1); /* set count */ outb(dp->count[chan], (len-1)>>8);
1995/0214		outb(dp->cbp, 0); /* set count & address to their first byte */ outb(dp->addr[chan], pa>>dp->shift); /* set address */ outb(dp->addr[chan], pa>>(8+dp->shift)); outb(dp->count[chan], (len>>dp->shift)-1); /* set count */ outb(dp->count[chan], ((len>>dp->shift)-1)>>8);
1991/0803		outb(dp->sbm, chan); /* enable the channel */ unlock(dp);
1995/0214		iunlock(dp);
1991/0803		return len; }
1994/1206/sys/src/9/pc/dma.c:177,185 – 1995/0214/sys/src/9/pc/dma.c:181,189
1991/0803		/* * disable the channel */ lock(dp);
1995/0214		ilock(dp);
1991/0803		outb(dp->sbm, 4|chan); unlock(dp);
1995/0214		iunlock(dp);
1991/0803		xp = &dp->x[chan];
1994/1206		if(xp->len == 0 || !xp->isread)