/*  * 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 "u.h"#include "../port/lib.h"#include "mem.h"#include "dat.h"#include "fns.h"#include "io.h"#include "../port/error.h" typedef struct IOMap IOMap;struct IOMap{	IOMap	*next;	char	tag[13];	ulong	start;	ulong	end;}; static struct{	Lock;	IOMap	*m;	IOMap	*free;	IOMap	maps[32];		// some initial free maps 	QLock	ql;			// lock for reading map} iomap; enum {	Qdir = 0,	Qioalloc = 1,	Qiob,	Qiow,	Qiol,	Qbase, 	Qmax = 16,}; typedef long Rdwrfn(Chan*, void*, long, vlong); static Rdwrfn *readfn[Qmax];static Rdwrfn *writefn[Qmax]; static Dirtab archdir[] = {	".",	{ Qdir, 0, QTDIR },	0,	0555,	"ioalloc",	{ Qioalloc, 0 },	0,	0444,	"iob",		{ Qiob, 0 },		0,	0660,	"iow",		{ Qiow, 0 },		0,	0660,	"iol",		{ Qiol, 0 },		0,	0660,};Lock archwlock;	/* the lock is only for changing archdir */int narchdir = Qbase;int (*_pcmspecial)(char *, ISAConf *);void (*_pcmspecialclose)(int); /* * Add a file to the #P listing.  Once added, you can't delete it. * You can't add a file with the same name as one already there, * and you get a pointer to the Dirtab entry so you can do things * like change the Qid version.  Changing the Qid path is disallowed. */Dirtab*addarchfile(char *name, int perm, Rdwrfn *rdfn, Rdwrfn *wrfn){	int i;	Dirtab d;	Dirtab *dp; 	memset(&d, 0, sizeof d);	strcpy(d.name, name);	d.perm = perm; 	lock(&archwlock);	if(narchdir >= Qmax){		unlock(&archwlock);		return nil;	} 	for(i=0; i<narchdir; i++)		if(strcmp(archdir[i].name, name) == 0){			unlock(&archwlock);			return nil;		} 	d.qid.path = narchdir;	archdir[narchdir] = d;	readfn[narchdir] = rdfn;	writefn[narchdir] = wrfn;	dp = &archdir[narchdir++];	unlock(&archwlock); 	return dp;} voidioinit(void){	int i; 	for(i = 0; i < nelem(iomap.maps)-1; i++)		iomap.maps[i].next = &iomap.maps[i+1];	iomap.maps[i].next = nil;	iomap.free = iomap.maps; 	// a dummy entry at 2^17	ioalloc(0x20000, 1, 0, "dummy");} ////	alloc some io port space and remember who it was//	alloced to.  if port < 0, find a free region.//intioalloc(int port, int size, int align, char *tag){	IOMap *m, **l;	int i; 	lock(&iomap);	if(port < 0){		// find a free port above 0x400 and below 0x1000		port = 0x400;		for(l = &iomap.m; *l; l = &(*l)->next){			m = *l;			i = m->start - port;			if(i > size)				break;			if(align > 0)				port = ((port+align-1)/align)*align;			else				port = m->end;		}		if(*l == nil){			unlock(&iomap);			return -1;		}	} else {		// see if the space clashes with previously allocated ports		for(l = &iomap.m; *l; l = &(*l)->next){			m = *l;			if(m->end <= port)				continue;			if(m->start >= port+size)				break;			unlock(&iomap);			return -1;		}	}	m = iomap.free;	if(m == nil){		print("ioalloc: out of maps");		unlock(&iomap);		return port;	}	iomap.free = m->next;	m->next = *l;	m->start = port;	m->end = port + size;	strncpy(m->tag, tag, sizeof(m->tag));	m->tag[sizeof(m->tag)-1] = 0;	*l = m; 	archdir[0].qid.vers++; 	unlock(&iomap);	return m->start;} voidiofree(int port){	IOMap *m, **l; 	lock(&iomap);	for(l = &iomap.m; *l; l = &(*l)->next){		if((*l)->start == port){			m = *l;			*l = m->next;			m->next = iomap.free;			iomap.free = m;			break;		}		if((*l)->start > port)			break;	}	archdir[0].qid.vers++;	unlock(&iomap);} intiounused(int start, int end){	IOMap *m; 	for(m = iomap.m; m; m = m->next){		if(start >= m->start && start < m->end		|| start <= m->start && end > m->start)			return 0; 	}	return 1;} static voidcheckport(int start, int end){	/* standard vga regs are OK */	if(start >= 0x2b0 && end <= 0x2df+1)		return;	if(start >= 0x3c0 && end <= 0x3da+1)		return; 	if(iounused(start, end))		return;	error(Eperm);} static Chan*archattach(char* spec){	return devattach('P', spec);} Walkqid*archwalk(Chan* c, Chan *nc, char** name, int nname){	return devwalk(c, nc, name, nname, archdir, narchdir, devgen);} static intarchstat(Chan* c, uchar* dp, int n){	return devstat(c, dp, n, archdir, narchdir, devgen);} static Chan*archopen(Chan* c, int omode){	return devopen(c, omode, archdir, nelem(archdir), devgen);} static voidarchclose(Chan*){} enum{	Linelen= 31,}; static longarchread(Chan *c, void *a, long n, vlong offset){	char buf[Linelen+1], *p;	int port;	ushort *sp;	ulong *lp;	IOMap *m;	Rdwrfn *fn; 	switch((ulong)c->qid.path){ 	case Qdir:		return devdirread(c, a, n, archdir, nelem(archdir), devgen); 	case Qiob:		port = offset;		checkport(offset, offset+n);		for(p = a; port < offset+n; port++)			*p++ = inb(port);		return n; 	case Qiow:		if((n & 0x01) || (offset & 0x01))			error(Ebadarg);		checkport(offset, offset+n+1);		n /= 2;		sp = a;		for(port = offset; port < offset+n; port += 2)			*sp++ = ins(port);		return n*2; 	case Qiol:		if((n & 0x03) || (offset & 0x03))			error(Ebadarg);		checkport(offset, offset+n+3);		n /= 4;		lp = a;		for(port = offset; port < offset+n; port += 4)			*lp++ = inl(port);		return n*4; 	case Qioalloc:		break; 	default:		if(c->qid.path < narchdir && (fn = readfn[c->qid.path]))			return fn(c, a, n, offset);		error(Eperm);		break;	} 	offset = offset/Linelen;	n = n/Linelen;	p = a;	lock(&iomap);	for(m = iomap.m; n > 0 && m != nil; m = m->next){		if(offset-- > 0)			continue;		if(strcmp(m->tag, "dummy") == 0)			break;		sprint(buf, "%8lux %8lux %-12.12s\n", m->start, m->end-1, m->tag);		memmove(p, buf, Linelen);		p += Linelen;		n--;	}	unlock(&iomap); 	return p - (char*)a;} static longarchwrite(Chan *c, void *a, long n, vlong offset){	char *p;	int port;	ushort *sp;	ulong *lp;	Rdwrfn *fn; 	switch((ulong)c->qid.path){ 	case Qiob:		p = a;		checkport(offset, offset+n);		for(port = offset; port < offset+n; port++)			outb(port, *p++);		return n; 	case Qiow:		if((n & 01) || (offset & 01))			error(Ebadarg);		checkport(offset, offset+n+1);		n /= 2;		sp = a;		for(port = offset; port < offset+n; port += 2)			outs(port, *sp++);		return n*2; 	case Qiol:		if((n & 0x03) || (offset & 0x03))			error(Ebadarg);		checkport(offset, offset+n+3);		n /= 4;		lp = a;		for(port = offset; port < offset+n; port += 4)			outl(port, *lp++);		return n*4; 	default:		if(c->qid.path < narchdir && (fn = writefn[c->qid.path]))			return fn(c, a, n, offset);		error(Eperm);		break;	}	return 0;} Dev archdevtab = {	'P',	"arch", 	devreset,	devinit,	devshutdown,	archattach,	archwalk,	archstat,	archopen,	devcreate,	archclose,	archread,	devbread,	archwrite,	devbwrite,	devremove,	devwstat,}; intpcmspecial(char *idstr, ISAConf *isa){	return (_pcmspecial  != nil)? _pcmspecial(idstr, isa): -1;} voidpcmspecialclose(int a){	if (_pcmspecialclose != nil)		_pcmspecialclose(a);}