/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include "all.h"#include "io.h" long	niob;long	nhiob;Hiob	*hiob; /* * Called to allocate permanent data structures * Alignment is in number of bytes. It pertains both to the start and * end of the allocated memory. */void*ialloc(ulong n, int align){	void *p = mallocalign(n, align, 0, 0); 	if (p == nil)		panic("ialloc: out of memory");	memset(p, 0, n);	return p;} voidprbanks(void){	Mbank *mbp; 	for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)		print("bank[%ld]: base 0x%8.8lux, limit 0x%8.8lux (%.0fMB)\n",			mbp - mconf.bank, mbp->base, mbp->limit,			(mbp->limit - mbp->base)/(double)MB);} static voidcmd_memory(int, char *[]){	prbanks();} enum { HWIDTH = 8 };		/* buffers per hash */ /* * allocate rest of mem * for io buffers. */voidiobufinit(void){	long m;	int i;	char *xiop;	Iobuf *p, *q;	Hiob *hp;	Mbank *mbp; 	wlock(&mainlock);	/* init */	wunlock(&mainlock); 	prbanks();	m = 0;	for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)		m += mbp->limit - mbp->base; 	niob = m / (sizeof(Iobuf) + RBUFSIZE + sizeof(Hiob)/HWIDTH);	nhiob = niob / HWIDTH;	while(!prime(nhiob))		nhiob++;	print("\t%ld buffers; %ld hashes\n", niob, nhiob);	hiob = ialloc(nhiob * sizeof(Hiob), 0);	hp = hiob;	for(i=0; i<nhiob; i++) {		lock(hp);		unlock(hp);		hp++;	}	p = ialloc(niob * sizeof(Iobuf), 0);	xiop = ialloc(niob * RBUFSIZE, 0);	hp = hiob;	for(i=0; i < niob; i++) {//		p->name = "buf";		qlock(p);		qunlock(p);		if(hp == hiob)			hp = hiob + nhiob;		hp--;		q = hp->link;		if(q) {			p->fore = q;			p->back = q->back;			q->back = p;			p->back->fore = p;		} else {			hp->link = p;			p->fore = p;			p->back = p;		}		p->dev = devnone;		p->addr = -1;//		p->xiobuf = ialloc(RBUFSIZE, RBUFSIZE);		p->xiobuf = xiop;		p->iobuf = (char*)-1;		p++;		xiop += RBUFSIZE;	} 	/*	 * Make sure that no more of bank[0] can be used.	 */	mconf.bank[0].base = mconf.bank[0].limit; 	i = 0;	for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)		i += mbp->limit - mbp->base;	print("\tmem left = %,d, out of %,ld\n", i, conf.mem);	/* paranoia: add this command as late as is easy */	cmd_install("memory", "-- print ranges of memory banks", cmd_memory);} void*iobufmap(Iobuf *p){	return p->iobuf = p->xiobuf;} voidiobufunmap(Iobuf *p){	p->iobuf = (char*)-1;}