1991/0802/port/page.c (diff list | history)

1991/0801/sys/src/9/port/page.c:51,82 – 1991/0802/sys/src/9/port/page.c:51,101 (short | long | prev | next)
1991/0705		}
1991/0425
1990/0227		/* * Called to allocate permanent data structures, before calling pageinit().
1991/0802		* Called to allocate permanent data structures, before calling pageinit(). * We assume all of text+data+bss is in the first memory bank.
1990/0227		*/ void* ialloc(ulong n, int align) { ulong p;
1991/0802		ulong *ap;
1990/0227
1990/1212		if(palloc.active && n!=0)
1990/0227		print("ialloc bad\n"); if(palloc.addr == 0) palloc.addr = ((ulong)&end)&~KZERO;
1991/0606		if(align) palloc.addr = PGROUND(palloc.addr);
1991/0801		if(palloc.addr+n > conf.base0 + conf.npage0*BY2PG) palloc.addr = conf.base1;
1991/0802		if(palloc.addr0 == 0){ palloc.addr0 = ((ulong)&end)&~KZERO; palloc.addr1 = conf.base1; }
1991/0801
1990/0227		memset((void*)(palloc.addr|KZERO), 0, n); p = palloc.addr; palloc.addr += n;
1991/0606		if(align) palloc.addr = PGROUND(palloc.addr);
1991/0802		/* * try first bank */ p = align ? PGROUND(palloc.addr0) : palloc.addr0; if(p+n > conf.base0 + (conf.npage0<<PGSHIFT)){ /* * no room in first bank, try second bank */ if(conf.npage1 <= 0) panic("keep bill joy away 1"); p = align ? PGROUND(palloc.addr1) : palloc.addr1; ap = &palloc.addr1; } else ap = &palloc.addr0;
1991/0606
1990/1211		if(palloc.addr >= conf.maxialloc) panic("keep bill joy away");
1991/0802		if(p >= conf.maxialloc) panic("keep bill joy away 2");
1991/0705
1991/0802		/* * zero it */ memset((void*)(p|KZERO), 0, n); /* * don't put anything else into a page aligned ialloc */ *ap = align ? PGROUND(p+n) : (p+n);
1990/0227		return (void*)(p|KZERO); }
1991/0801/sys/src/9/port/page.c:83,126 – 1991/0802/sys/src/9/port/page.c:102,156
1990/0227		void pageinit(void) { ulong pa, nb, ppn;
1991/0802		ulong np, addr, lim;
1991/0705		ulong i, vmem, pmem;
1990/0227		Page *p; palloc.active = 1;
1991/0802		/* * calculate an upper bound to the number of pages structures * we'll need (np). */ np = (conf.npage0<<PGSHIFT) - (palloc.addr0 - conf.base0); np += (conf.npage1<<PGSHIFT) - (palloc.addr1 - conf.base1); np = np>>PGSHIFT;
1990/0227		nb = (conf.npage<<PGSHIFT) - palloc.addr; nb -= ((nb+(BY2PG-1))>>PGSHIFT)*sizeof(Page); /* safe overestimate */ nb &= ~(BY2PG-1);
1991/0705		pa = (conf.npage<<PGSHIFT) - nb; /* physical addr of first free page */ ppn = pa >> PGSHIFT; /* physical page number of first free page */
1990/0227		palloc.page = (Page *)((palloc.addr - ppn*sizeof(Page))|KZERO); /* * Now palloc.page[ppn] describes first free page
1991/0802		* allocate Page structs (no more ialloc's allowed after this). * np is useless after this ialloc since we've just eaten up * some pages for the Page structures.
1990/0227		*/ palloc.minppn = ppn; palloc.addr = ppn<<PGSHIFT;
1991/0802		palloc.head = ialloc(np*sizeof(Page), 0); palloc.active = 1;
1990/0227		palloc.head = &palloc.page[ppn]; palloc.tail = &palloc.page[conf.npage-1]; memset(palloc.head, 0, (conf.npage-ppn)*sizeof(Page));
1991/0705		pmem = ((conf.npage-ppn)*BY2PG)/1024; vmem = pmem + ((conf.nswap)*BY2PG)/1024; palloc.user = conf.npage-ppn; print("%lud free pages, %dK bytes, swap %dK bytes\n", palloc.user, pmem, vmem);
1990/0227		for(p=palloc.head; p<=palloc.tail; p++,ppn++){
1991/0802		/* * for each page in each bank, point a page structure to * the page and chain it into the free list */ p = palloc.head; addr = palloc.addr0 = PGROUND(palloc.addr0); lim = conf.base0 + (conf.npage0<<PGSHIFT); for(; addr < lim; addr += BY2PG){
1990/0227		p->next = p+1; p->prev = p-1;
1990/1211		if(ppn < conf.npage0) p->pa = conf.base0+(ppn<<PGSHIFT); else p->pa = conf.base1+((ppn-conf.npage0)<<PGSHIFT);
1991/0705		palloc.freecount++;
1991/0802		p->pa = addr; p++;
1990/0227		}
1991/0802		addr = palloc.addr1 = PGROUND(palloc.addr1); lim = conf.base1 + (conf.npage1<<PGSHIFT); for(; addr < lim; addr += BY2PG){ p->next = p+1; p->prev = p-1; p->pa = addr; p++; } palloc.tail = p - 1;
1990/0227		palloc.head->prev = 0; palloc.tail->next = 0;
1991/0802		palloc.user = palloc.freecount = p - palloc.head; pmem = palloc.user*BY2PG/1024; vmem = pmem + ((conf.nswap)*BY2PG)/1024; print("%lud free pages, %dK bytes, swap %dK bytes\n", palloc.user, pmem, vmem);
1990/0227		} Page*