1991/0607/port/fault.c (diff list | history)

1991/0606/sys/src/9/port/fault.c:9,15 – 1991/0607/sys/src/9/port/fault.c:9,15 (short | long | prev | next)
1990/1212		int fault(ulong addr, int read)
1990/0227		{
1991/0606		ulong mmuvirt, mmuphys = 0, n;
1991/0607		ulong mmuvirt, mmuphys, uncache = 0, n;
1990/0227		Seg *s; PTE *opte, *pte, *npte; Orig *o;
1991/0606/sys/src/9/port/fault.c:67,73 – 1991/0607/sys/src/9/port/fault.c:67,77
1991/0606		/* Make a new bss or lock segment page */ if(s - u->p->seg == LSEG) { pte->page = lkpage(o, addr); mmuphys = PTEUNCACHE;
1991/0607		if(pte->page == 0) { unlock(o); return -1; } uncache = PTEUNCACHED;
1991/0606		} else pte->page = newpage(0, o, addr);
1991/0606/sys/src/9/port/fault.c:115,123 – 1991/0607/sys/src/9/port/fault.c:119,130
1990/0227		/*
1990/1212		* Copy on reference (conf.copymode==1) or write (conf.copymode==0)
1990/0227		*/
1990/1212		if((o->flag & OWRPERM) && (conf.copymode || !read)
1991/0607		if((o->flag & (OWRPERM|OSHARED))==OWRPERM && (conf.copymode || !read)
1990/0227		&& ((head && ((o->flag&OPURE) || o->nproc>1)) || (!head && pte->page->ref>1))){
1991/0607		if(!(o->flag&OISMEM)) panic("copy on ref/wr to non memory");
1991/0425		touched = 1;
1990/0227		/* * Look for the easy way out: are we the last non-modified?
1991/0606/sys/src/9/port/fault.c:163,168 – 1991/0607/sys/src/9/port/fault.c:170,176
1991/0606		* increment on the mod list which must be removed */ if(zeroed){
1991/0607		pg->ref--;
1990/0227		o->npage--; opte->page = 0; }else{ /* copy page */
1991/0606/sys/src/9/port/fault.c:174,198 – 1991/0607/sys/src/9/port/fault.c:182,208
1990/1212		kunmap(k1);
1990/0227		if(pg->ref <= 1) panic("pg->ref <= 1");
1991/0607		pg->ref--;
1990/0227		}
1991/0606		pg->ref--;
1990/0227		easy:
1991/0606		mmuphys |= PTEWRITE;
1991/0607		mmuphys = PTEWRITE;
1990/0227		}else{
1991/0606		mmuphys |= PTERONLY;
1991/0607		mmuphys = PTERONLY;
1990/0227		if(o->flag & OWRPERM) if(o->flag & OPURE){ if(!head && pte->page->ref==1)
1991/0606		mmuphys |= PTEWRITE;
1991/0607		mmuphys = PTEWRITE;
1990/0227		}else if((head && o->nproc==1) || (!head && pte->page->ref==1))
1991/0606		mmuphys |= PTEWRITE;
1991/0607		mmuphys = PTEWRITE;
1990/0227		} mmuvirt = addr;
1990/1212		mmuphys |= PPN(pte->page->pa) | PTEVALID;
1990/0227		usepage(pte->page, 1);
1991/0607		mmuphys |= PPN(pte->page->pa) | PTEVALID | uncache; if(o->flag&OISMEM) usepage(pte->page, 1);
1990/0227		if(pte->page->va != addr) panic("wrong addr in tail %lux %lux", pte->page->va, addr); if(pte->proc && pte->proc != u->p){
1991/0606/sys/src/9/port/fault.c:200,208 – 1991/0607/sys/src/9/port/fault.c:210,220
1990/0227		print("u->p %lux pte->proc %lux\n", u->p, pte->proc); panic("addr %lux seg %d wrong proc in tail", addr, s-u->p->seg); }
1991/0607
1990/0227		unlock(o);
1991/0425		if(touched == 0) m->tlbfault++;
1991/0607
1990/0227		putmmu(mmuvirt, mmuphys);
1990/1212		return 0;
1990/0227		}