1991/0608/port/fault.c (diff list | history)

1991/0607/sys/src/9/port/fault.c:9,15 – 1991/0608/sys/src/9/port/fault.c:9,15 (short | long | prev | next)
1990/1212		int fault(ulong addr, int read)
1990/0227		{
1991/0607		ulong mmuvirt, mmuphys, uncache = 0, n;
1991/0608		ulong mmuvirt, mmuphys, n;
1990/0227		Seg *s; PTE *opte, *pte, *npte; Orig *o;
1991/0607/sys/src/9/port/fault.c:71,77 – 1991/0608/sys/src/9/port/fault.c:71,76
1991/0607		unlock(o); return -1; } uncache = PTEUNCACHED;
1991/0606		} else pte->page = newpage(0, o, addr);
1991/0607/sys/src/9/port/fault.c:116,127 – 1991/0608/sys/src/9/port/fault.c:115,133
1990/0227		} } } /*
1990/1212		* Copy on reference (conf.copymode==1) or write (conf.copymode==0)
1990/0227		*/
1991/0607		if((o->flag & (OWRPERM|OSHARED))==OWRPERM && (conf.copymode || !read)
1991/0608		if(o->flag&OSHARED) { /* BUG: Does not cover enough flag options to shared data */ mmuphys = PTERONLY; if(o->flag & OWRPERM) mmuphys = PTEWRITE; } else if((o->flag&OWRPERM) && (conf.copymode || !read)
1990/0227		&& ((head && ((o->flag&OPURE) || o->nproc>1)) || (!head && pte->page->ref>1))){
1991/0608		/* * Copy on reference (conf.copymode==1) or write (conf.copymode==0) */
1991/0607		if(!(o->flag&OISMEM)) panic("copy on ref/wr to non memory");
1991/0607/sys/src/9/port/fault.c:199,207 – 1991/0608/sys/src/9/port/fault.c:205,217
1991/0607		mmuphys = PTEWRITE;
1990/0227		} mmuvirt = addr;
1991/0607		mmuphys |= PPN(pte->page->pa) | PTEVALID | uncache; if(o->flag&OISMEM)
1991/0608		/* Non memory is always uncached */ if(o->flag&OISMEM) { mmuphys |= PPN(pte->page->pa) | PTEVALID;
1991/0607		usepage(pte->page, 1);
1991/0608		}else mmuphys |= PPN(pte->page->pa) | PTEVALID | PTEUNCACHED;
1991/0607
1990/0227		if(pte->page->va != addr) panic("wrong addr in tail %lux %lux", pte->page->va, addr);
1991/0607/sys/src/9/port/fault.c:216,221 – 1991/0608/sys/src/9/port/fault.c:226,235
1991/0425		m->tlbfault++;
1991/0607
1990/0227		putmmu(mmuvirt, mmuphys);
1991/0608		/* if(s - u->p->seg == LSEG) print("%d: f %lux v %lux p %lux\n", u->p->pid, o->flag, mmuvirt, mmuphys); */
1990/1212		return 0;
1990/0227		}