1996/0607/pc/dma.c (diff list | history)

1995/0701/sys/src/9/pc/dma.c:4,12 – 1996/0607/sys/src/9/pc/dma.c:4,9 (short | long | prev | next)
1991/0803		#include "dat.h" #include "fns.h" /* * headland chip set for the safari. */ typedef struct DMAport DMAport; typedef struct DMA DMA; typedef struct DMAxfer DMAxfer;
1995/0701/sys/src/9/pc/dma.c:33,40 – 1996/0607/sys/src/9/pc/dma.c:30,38
1991/0803		*/ struct DMAxfer {
1993/0915		Page pg; /* page used by dma */
1991/0803		void *va; /* virtual address destination/src */
1996/0607		ulong bpa; /* bounce buffer physical address */ void* bva; /* bounce buffer virtual address */ void* va; /* virtual address destination/src */
1991/0803		long len; /* bytes to be transferred */ int isread; };
1995/0701/sys/src/9/pc/dma.c:95,102 – 1996/0607/sys/src/9/pc/dma.c:93,100
1993/0915		dp = &dma[i]; for(chan = 0; chan < 4; chan++){ xp = &dp->x[chan]; xp->pg.pa = (ulong)xspanalloc(BY2PG, BY2PG, 0); xp->pg.va = KZERO|xp->pg.pa;
1996/0607		xp->bva = xspanalloc(BY2PG, BY2PG, 0); xp->bpa = PADDR(xp->bva);
1995/0214		xp->len = 0; xp->isread = 0;
1993/0915		}
1995/0701/sys/src/9/pc/dma.c:117,125 – 1996/0607/sys/src/9/pc/dma.c:115,123
1991/0803		dmasetup(int chan, void *va, long len, int isread) { DMA *dp; DMAxfer *xp; ulong pa; uchar mode;
1996/0607		DMAxfer *xp;
1991/0803		dp = &dma[(chan>>2)&1]; chan = chan & 3;
1995/0701/sys/src/9/pc/dma.c:132,147 – 1996/0607/sys/src/9/pc/dma.c:130,146
1993/0915		pa = PADDR(va);
1992/1013		if((((ulong)va)&0xF0000000) != KZERO
1993/0915		|| (pa&0xFFFF0000) != ((pa+len)&0xFFFF0000) || pa > 16*MB){
1996/0607		|| pa > 16*MB) {
1991/0803		if(len > BY2PG) len = BY2PG; if(!isread)
1993/0915		memmove((void*)(xp->pg.va), va, len);
1996/0607		memmove(xp->bva, va, len);
1991/0803		xp->va = va; xp->len = len; xp->isread = isread;
1993/0915		pa = xp->pg.pa;
1991/0925		} else
1996/0607		pa = xp->bpa; } else
1991/0925		xp->len = 0;
1991/0803		/*
1995/0701/sys/src/9/pc/dma.c:149,155 – 1996/0607/sys/src/9/pc/dma.c:148,154
1991/0803		*/
1995/0214		ilock(dp);
1991/0803		mode = (isread ? 0x44 : 0x48) | chan; outb(dp->mode, mode); /* single mode dma (give CPU a chance at mem) */
1996/0607		outb(dp->mode, mode); /* single mode dma (give CPU a chance at mem) */
1991/0803		outb(dp->page[chan], pa>>16);
1995/0214		outb(dp->cbp, 0); /* set count & address to their first byte */ outb(dp->addr[chan], pa>>dp->shift); /* set address */
1995/0701/sys/src/9/pc/dma.c:203,218 – 1996/0607/sys/src/9/pc/dma.c:202,207
1991/0803		/* * copy out of temporary page */
1993/0915		memmove(xp->va, (void*)(xp->pg.va), xp->len);
1996/0607		memmove(xp->va, xp->bva, xp->len);
1991/0925		xp->len = 0;
1991/0803		}
1995/0701		void dmaemode(int chan, int value) { if(chan < 4) outb(0x40b, value|chan); else outb(0x4d6, value|chan);                  }