1991/0821/gnot/mmu.c (diff list | history)

1991/0817/sys/src/9/gnot/mmu.c:9,15 – 1991/0821/sys/src/9/gnot/mmu.c:9,15 (short | long | prev | next)
1990/06021		Lock; int init; KMap *free; KMap arena[4*1024*1024/BY2PG]; /* kernel mmu maps up to 4MB */
1991/0821		KMap arena[MB4/BY2PG]; /* kernel mmu maps up to 4MB */
1990/06021		}kmapalloc;
1990/03091		/*
1991/0817/sys/src/9/gnot/mmu.c:120,134 – 1991/0821/sys/src/9/gnot/mmu.c:120,137
1990/06021		if(kmapalloc.init == 0){ k = &kmapalloc.arena[0];
1990/0709		k->va = KZERO|(4*1024*1024-256*1024-BY2PG);
1991/0821		k->va = KZERO|(MB4-256*1024-BY2PG);
1990/06021		k->next = 0; kmapalloc.free = k; kmapalloc.init = 1; return; } e = (4*1024*1024 - 256*1024)/BY2PG; /* screen lives at top 256K */
1991/0821		e = (MB4 - 256*1024)/BY2PG; /* screen lives at top 256K */
1991/0802		i = PGROUND(((ulong)ialloc(0, 0))&~KZERO)/BY2PG;
1991/0821
1990/0709		print("%lud free map registers\n", e-i);
1991/0821
1990/06021		kmapalloc.free = 0; for(k=&kmapalloc.arena[i]; i<e; i++,k++){ k->va = i*BY2PG|KZERO;
1991/0817/sys/src/9/gnot/mmu.c:140,151 – 1991/0821/sys/src/9/gnot/mmu.c:143,149
1990/06021		kmap(Page *pg) { KMap *k;
1991/0817		int s;
1990/06021
1991/0817		if(u && u->p){ s = u->p->state; u->p->state = MMUing; }
1990/06021		lock(&kmapalloc); k = kmapalloc.free;
1990/0709		if(k == 0){
1991/0817/sys/src/9/gnot/mmu.c:154,163 – 1991/0821/sys/src/9/gnot/mmu.c:152,160
1990/0709		}
1990/06021		kmapalloc.free = k->next; unlock(&kmapalloc);
1991/0821
1990/06021		k->pa = pg->pa; putkmmu(k->va, PPN(k->pa) | PTEVALID | PTEKERNEL);
1991/0817		if(u && u->p) u->p->state = s;
1990/06021		return k; }
1991/0817/sys/src/9/gnot/mmu.c:165,174 – 1991/0821/sys/src/9/gnot/mmu.c:162,172
1990/06021		kunmap(KMap *k) { k->pa = 0;
1991/0821		putkmmu(k->va, INVALIDPTE);
1990/06021		lock(&kmapalloc); k->next = kmapalloc.free; kmapalloc.free = k; putkmmu(k->va, INVALIDPTE); unlock(&kmapalloc);
1990/1211		}