1990/0802/port/page.c (diff list | history)

1990/0801/sys/src/9/port/page.c:4,9 – 1990/0802/sys/src/9/port/page.c:4,10 (short | long | prev | next)
1990/0227		#include "dat.h" #include "fns.h" #include "ureg.h"
1990/0802		#include "errno.h"
1990/0227		struct {
1990/0801/sys/src/9/port/page.c:257,263 – 1990/0802/sys/src/9/port/page.c:258,263
1990/0801		void unusepage(Page *p, int dolock) { return; if(dolock) lock(&palloc); /*
1990/0801/sys/src/9/port/page.c:339,345 – 1990/0802/sys/src/9/port/page.c:339,354
1990/0303		o->mqid = -1; o->mchan = 0;
1990/0227		}
1990/0802		lock(o); if(u && u->p && waserror()){ unlock(o); unlock(&origalloc); nexterror(); }
1990/0227		growpte(o, npte);
1990/0802		if(u && u->p) poperror(); unlock(o);
1990/0227		unlock(&origalloc); return o; }
1990/0801/sys/src/9/port/page.c:527,533 – 1990/0802/sys/src/9/port/page.c:536,541
1990/0227		if(max < min) return 0;
1990/0801		if(max > 20*1024*1024) {pprint("segaddr %lux\n", max);print("segaddr %lux\n", max);}
1990/0227		if(min != s->minva) /* can't grow down yet (stacks: fault.c) */ return 0; max = (max+(BY2PG-1)) & ~(BY2PG-1);
1990/0801/sys/src/9/port/page.c:539,546 – 1990/0802/sys/src/9/port/page.c:547,561
1990/0227		* Grow */ /* BUG: check spill onto other segments */
1990/0802		lock(o); if(waserror()){ unlock(o); nexterror(); }
1990/0227		if(o->va+BY2PG*o->npte < max) growpte(o, (max-o->va)>>PGSHIFT);
1990/0802		unlock(o); poperror();
1990/0227		s->maxva = max; return 1; }
1990/0801/sys/src/9/port/page.c:593,599 – 1990/0802/sys/src/9/port/page.c:608,613
1990/0227		ulong nfree; lock(&ptealloc); lock(o); if(o->pte){
1990/0728		if(o->npte == n){ if(u && u->p) print("%s: ", u->p->text);
1990/0801/sys/src/9/port/page.c:613,623 – 1990/0802/sys/src/9/port/page.c:627,639
1990/0227		}else{ n++; if(p+p->n == ptealloc.free){ compactpte(o, n - p->n);
1990/0802		if(!compactpte(o, n - p->n)) goto Trouble;
1990/0227		p = (PTEA*)(o->pte - 1); ptealloc.free += n - p->n; }else{ compactpte(o, n);
1990/0802		if(!compactpte(o, n)) goto Trouble;
1990/0227		p = ptealloc.free; ptealloc.free += n; memcpy(p+1, o->pte, o->npte*sizeof(PTE));
1990/0801/sys/src/9/port/page.c:632,638 – 1990/0802/sys/src/9/port/page.c:648,655
1990/0728		goto Return;
1990/0227		} n++; compactpte(o, n);
1990/0802		if(!compactpte(o, n)) goto Trouble;
1990/0227		p = ptealloc.free; ptealloc.free += n; memset(p, 0, n*sizeof(PTE));
1990/0801/sys/src/9/port/page.c:641,651 – 1990/0802/sys/src/9/port/page.c:658,674
1990/0227		o->pte = p+1; o->npte = n-1;
1990/0728		Return:
1990/0227		unlock(o); unlock(&ptealloc);
1990/0802		return; Trouble: unlock(&ptealloc); if(u && u->p) error(0, Enovmem); panic("growpte fails %d %lux %d\n", n, o->va, o->npte);
1990/0227		} void
1990/0802		int
1990/0227		compactpte(Orig *o, ulong n) { PTEA *p1, *p2;
1990/0801/sys/src/9/port/page.c:652,658 – 1990/0802/sys/src/9/port/page.c:675,681
1990/0227		Orig *p2o; if(ptealloc.end-ptealloc.free >= n) return;
1990/0802		return 1;
1990/0227		p1 = ptealloc.arena; /* dest */ p2 = ptealloc.arena; /* source */ while(p2 < ptealloc.free){
1990/0801/sys/src/9/port/page.c:681,688 – 1990/0802/sys/src/9/port/page.c:704,714
1990/0227		} ptealloc.free = p1; if(ptealloc.end-ptealloc.free >= n) return;
1990/0802		return 1;
1990/0227		unlock(o); unlock(&ptealloc); panic("compactpte %d %lux %d", n, o->va, o->npte);
1990/0802		if(u && u->p) print("%s: %s: ", u->p->text, u->p->pgrp->user); print("compactpte fails addr %lux\n", o->va+n*BY2PG); return 0;
1990/0227		}