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#include "all.h"
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#include "io.h"
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long	niob;
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long	nhiob;
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Hiob	*hiob;
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/*
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 * Called to allocate permanent data structures
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 * Alignment is in number of bytes. It pertains both to the start and
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 * end of the allocated memory.
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 */
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void*
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ialloc(ulong n, int align)
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{
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	void *p = mallocalign(n, align, 0, 0);
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	if (p == nil)
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		panic("ialloc: out of memory");
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	memset(p, 0, n);
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	return p;
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}
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void
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prbanks(void)
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{
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	Mbank *mbp;
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	for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)
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		print("bank[%ld]: base 0x%8.8lux, limit 0x%8.8lux (%.0fMB)\n",
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			mbp - mconf.bank, mbp->base, mbp->limit,
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			(mbp->limit - mbp->base)/(double)MB);
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}
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static void
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cmd_memory(int, char *[])
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{
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	prbanks();
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}
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enum { HWIDTH = 8 };		/* buffers per hash */
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/*
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 * allocate rest of mem
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 * for io buffers.
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 */
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void
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iobufinit(void)
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{
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	long m;
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	int i;
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	char *xiop;
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	Iobuf *p, *q;
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	Hiob *hp;
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	Mbank *mbp;
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	wlock(&mainlock);	/* init */
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	wunlock(&mainlock);
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	prbanks();
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	m = 0;
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	for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)
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		m += mbp->limit - mbp->base;
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	niob = m / (sizeof(Iobuf) + RBUFSIZE + sizeof(Hiob)/HWIDTH);
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	nhiob = niob / HWIDTH;
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	while(!prime(nhiob))
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		nhiob++;
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	print("\t%ld buffers; %ld hashes\n", niob, nhiob);
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	hiob = ialloc(nhiob * sizeof(Hiob), 0);
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	hp = hiob;
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	for(i=0; i<nhiob; i++) {
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		lock(hp);
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		unlock(hp);
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		hp++;
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	}
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	p = ialloc(niob * sizeof(Iobuf), 0);
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	xiop = ialloc(niob * RBUFSIZE, 0);
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	hp = hiob;
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	for(i=0; i < niob; i++) {
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//		p->name = "buf";
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		qlock(p);
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		qunlock(p);
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		if(hp == hiob)
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			hp = hiob + nhiob;
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		hp--;
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		q = hp->link;
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		if(q) {
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			p->fore = q;
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			p->back = q->back;
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			q->back = p;
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			p->back->fore = p;
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		} else {
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			hp->link = p;
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			p->fore = p;
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			p->back = p;
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		}
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		p->dev = devnone;
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		p->addr = -1;
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//		p->xiobuf = ialloc(RBUFSIZE, RBUFSIZE);
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		p->xiobuf = xiop;
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		p->iobuf = (char*)-1;
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		p++;
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		xiop += RBUFSIZE;
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	}
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	/*
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	 * Make sure that no more of bank[0] can be used.
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	 */
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	mconf.bank[0].base = mconf.bank[0].limit;
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	i = 0;
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	for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)
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		i += mbp->limit - mbp->base;
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	print("\tmem left = %,d, out of %,ld\n", i, conf.mem);
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	/* paranoia: add this command as late as is easy */
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	cmd_install("memory", "-- print ranges of memory banks", cmd_memory);
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}
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void*
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iobufmap(Iobuf *p)
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{
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	return p->iobuf = p->xiobuf;
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}
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void
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iobufunmap(Iobuf *p)
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{
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	p->iobuf = (char*)-1;
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}