1991/0706/port/segment.c (diff list | history)

1991/0705/sys/src/9/port/segment.c:11,16 – 1991/0706/sys/src/9/port/segment.c:11,17 (short | long | prev | next)
1991/0705		Page *lkpage(ulong addr); Page *snewpage(ulong addr); void lkpgfree(Page*);
1991/0706		void imagereclaim(void);
1991/0705		/* System specific segattach devices */ #include "segment.h"
1991/0705/sys/src/9/port/segment.c:30,35 – 1991/0706/sys/src/9/port/segment.c:31,38
1991/0705		Segment *free; }segalloc;
1991/0706		static QLock ireclaim;
1991/0705		void initseg(void) {
1991/0705/sys/src/9/port/segment.c:75,80 – 1991/0706/sys/src/9/port/segment.c:78,84
1991/0705		s->flen = 0; s->pgalloc = 0; s->pgfree = 0;
1991/0706		s->flushme = 0;
1991/0705		memset(s->map, 0, sizeof(s->map)); return s;
1991/0705/sys/src/9/port/segment.c:135,149 – 1991/0706/sys/src/9/port/segment.c:139,160
1991/0705		int i; switch(s->type&SG_TYPE) { case SG_TEXT: /* new segment shares pte set */
1991/0706		case SG_TEXT: /* New segment shares pte set */
1991/0705		case SG_SHARED: case SG_PHYSICAL: incref(s); return s; case SG_DATA: /* copy on write both old and new plus demand load info */ lock(s);
1991/0706		case SG_BSS: /* Just copy on write */ case SG_STACK: qlock(&s->lk);
1991/0705		n = newseg(s->type, s->base, s->size);
1991/0706		goto copypte;
1991/0705
1991/0706		case SG_DATA: /* Copy on write plus demand load info */ qlock(&s->lk); n = newseg(s->type, s->base, s->size);
1991/0705		incref(s->image); n->image = s->image; n->fstart = s->fstart;
1991/0705/sys/src/9/port/segment.c:152,164 – 1991/0706/sys/src/9/port/segment.c:163,172
1991/0705		for(i = 0; i < SEGMAPSIZE; i++) if(pte = s->map[i]) n->map[i] = ptecpy(pte); unlock(s);
1991/0706		n->flushme = s->flushme; qunlock(&s->lk);
1991/0705		return n; case SG_BSS: /* Just copy on write */ case SG_STACK: lock(s); n = newseg(s->type, s->base, s->size); goto copypte; } panic("dupseg");
1991/0705/sys/src/9/port/segment.c:188,193 – 1991/0706/sys/src/9/port/segment.c:196,202
1991/0705		lock(&imagealloc);
1991/0706		/* Search the image cache for remains of the text from a previous incarnation */
1991/0705		for(i = ihash(c->qid.path); i; i = i->hash) { if(c->qid.path == i->qid.path) { lock(i);
1991/0705/sys/src/9/port/segment.c:204,209 – 1991/0706/sys/src/9/port/segment.c:213,219
1991/0705		while(!(i = imagealloc.free)) { unlock(&imagealloc);
1991/0706		imagereclaim();
1991/0705		resrcwait("no images"); lock(&imagealloc); }
1991/0705/sys/src/9/port/segment.c:236,241 – 1991/0706/sys/src/9/port/segment.c:246,277
1991/0705		} void
1991/0706		imagereclaim(void) { Page *p; if(!canqlock(&ireclaim)) /* Somebody is already cleaning the page cache */ return; lock(&palloc); for(p = palloc.head; p; p = p->next) { if(p->image == 0) continue; unlock(&palloc); lockpage(p); if(p->ref == 0 && p->image != &swapimage) uncachepage(p); unlockpage(p); lock(&palloc); } unlock(&palloc); qunlock(&ireclaim); } void
1991/0705		putimage(Image *i) { Image *f, **l;
1991/0705/sys/src/9/port/segment.c:271,277 – 1991/0706/sys/src/9/port/segment.c:307,313
1991/0705		} long ibrk(ulong addr, int seg) /* Called with a locked segment */
1991/0706		ibrk(ulong addr, int seg)
1991/0705		{ Segment *s, *ns; ulong newtop, newsize;
1991/0705/sys/src/9/port/segment.c:427,432 – 1991/0706/sys/src/9/port/segment.c:463,470
1991/0705		s = seg(u->p, arg[0], 1); if(s == 0) errors("bad segment address");
1991/0706		s->flushme = 1;
1991/0705		soff = arg[0]-s->base; j = (soff&(PTEMAPMEM-1))/BY2PG;