1999/0713/pc/dma.c (diff list | history)

1999/0713/sys/src/9/pc/dma.c:8,30 – 1999/0714/sys/src/9/pc/dma.c:8,13 (short | long | prev)
Use ioalloc. rsc Fri Mar 4 12:44:25 2005
1991/0803		typedef struct DMA DMA; typedef struct DMAxfer DMAxfer; enum { /* * the byte registers for DMA0 are all one byte apart */ Dma0= 0x00, Dma0status= Dma0+0x8, /* status port */ Dma0reset= Dma0+0xD, /* reset port */                  /* * the byte registers for DMA1 are all two bytes apart (why?) */ Dma1= 0xC0, Dma1status= Dma1+2*0x8, /* status port */ Dma1reset= Dma1+2*0xD, /* reset port */ };                  /* * state of a dma transfer */
1999/0713/sys/src/9/pc/dma.c:89,99 – 1999/0714/sys/src/9/pc/dma.c:72,86
1993/0915		{ DMA *dp; DMAxfer *xp;
1999/0714		static int once;
1993/0915
1999/0713		if(ioalloc(0x00, 0x10, 0) < 0 || ioalloc(0x80, 0x10, 0) < 0 || ioalloc(0xd0, 0x10, 0) < 0) panic("dmainit");
1999/0714		if(once == 0){ if(ioalloc(0x00, 0x10, 0, "dma") < 0 || ioalloc(0x80, 0x10, 0, "dma") < 0 || ioalloc(0xd0, 0x10, 0, "dma") < 0) panic("dmainit"); once = 1; }
1999/0713
1999/0403		if(maxtransfer > 64*1024) maxtransfer = 64*1024;