i82365.c

著名操作系统Plan 9的第三版的部分核心源代码。现在很难找到了。Plan 9是bell实验室开发的Unix后继者。

	meminit(0);

	memset(&isa, 0, sizeof(ISAConf));
	vector = VectorPCMCIA;
	if(isaconfig("pcmcia", 0, &isa) && isa.irq)
		vector = VectorPIC+isa.irq;

	/* look for controllers */
	i82386probe(0x3E0, 0x3E1, 0);
	i82386probe(0x3E0, 0x3E1, 1);
	i82386probe(0x3E2, 0x3E3, 0);
	i82386probe(0x3E2, 0x3E3, 1);
	for(i = 0; i < ncontroller; i++)
		nslot += controller[i]->nslot;
	slot = xalloc(nslot * sizeof(Slot));

	/* if the card is there turn on 5V power to keep its battery alive */
	lastslot = slot;
	for(i = 0; i < ncontroller; i++){
		cp = controller[i];
		print("#y%d: %d slot %s: port 0x%uX irq %d\n",
			i, cp->nslot, chipname[cp->type], cp->xreg, vector-VectorPIC);
		for(j = 0; j < cp->nslot; j++){
			pp = lastslot++;
			pp->slotno = pp - slot;
			pp->memlen = 64*MB;
			pp->base = (cp->dev<<7) | (j<<6);
			pp->cp = cp;
			slotdis(pp);

			/* interrupt on status change */
			wrreg(pp, Rcscic, ((vector-VectorPIC)<<4) | Fchangeena);
			rdreg(pp, Rcsc);
		}
	}

	/* for card management interrupts */
	if(ncontroller)
		intrenable(vector, i82365intr, 0, BUSUNKNOWN);
}

/* a memmove using only bytes */
static void
memmoveb(uchar *to, uchar *from, int n)
{
	while(n-- > 0)
		*to++ = *from++;
}

/* a memmove using only shorts & bytes */
static void
memmoves(uchar *to, uchar *from, int n)
{
	ushort *t, *f;

	if((((ulong)to) & 1) || (((ulong)from) & 1) || (n & 1)){
		while(n-- > 0)
			*to++ = *from++;
	} else {
		n = n/2;
		t = (ushort*)to;
		f = (ushort*)from;
		while(n-- > 0)
			*t++ = *f++;
	}
}

/*
 *  configure the Slot for IO.  We assume very heavily that we can read
 *  configuration info from the CIS.  If not, we won't set up correctly.
 */
static int
pcmio(int slotno, ISAConf *isa)
{
	uchar we, x, *p;
	Slot *pp;
	Conftab *ct, *et, *t;
	PCMmap *m;
	int i, index, irq;
	char *cp;

	irq = isa->irq;
	if(irq == 2)
		irq = 9;

	if(slotno > nslot)
		return -1;
	pp = slot + slotno;

	if(!pp->occupied)
		return -1;

	et = &pp->ctab[pp->nctab];

	ct = 0;
	for(i = 0; i < isa->nopt; i++){
		if(strncmp(isa->opt[i], "index=", 6))
			continue;
		index = strtol(&isa->opt[i][6], &cp, 0);
		if(cp == &isa->opt[i][6] || index >= pp->nctab)
			return -1;
		ct = &pp->ctab[index];
	}
	if(ct == 0){
	
		/* assume default is right */
		if(pp->def)
			ct = pp->def;
		else
			ct = pp->ctab;
	
		/* try for best match */
		if(ct->nioregs == 0 || ct->port != isa->port || ((1<<irq) & ct->irqs) == 0){
			for(t = pp->ctab; t < et; t++)
				if(t->nioregs && t->port == isa->port && ((1<<irq) & t->irqs)){
					ct = t;
					break;
				}
		}
		if(ct->nioregs == 0 || ((1<<irq) & ct->irqs) == 0){
			for(t = pp->ctab; t < et; t++)
				if(t->nioregs && ((1<<irq) & t->irqs)){
					ct = t;
					break;
				}
		}
		if(ct->nioregs == 0){
			for(t = pp->ctab; t < et; t++)
				if(t->nioregs){
					ct = t;
					break;
				}
		}
	}

	if(ct == et || ct->nioregs == 0)
		return -1;
	if(isa->port == 0 && ct->port == 0)
		return -1;

	/* route interrupts */
	isa->irq = irq;
	wrreg(pp, Rigc, irq | Fnotreset | Fiocard);
	
	/* set power and enable device */
	x = vcode(ct->vpp1);
	wrreg(pp, Rpc, x|Fautopower|Foutena|Fcardena);

	/* 16-bit data path */
	if(ct->bit16)
		x = Fiocs16|Fwidth16;
	else
		x = 0;
	wrreg(pp, Rio, Ftiming|x);

	/* enable io port map 0 */
	if(isa->port == 0)
		isa->port = ct->port;
	we = rdreg(pp, Rwe);
	wrreg(pp, Riobtm0lo, isa->port);
	wrreg(pp, Riobtm0hi, isa->port>>8);
	wrreg(pp, Riotop0lo, (isa->port+ct->nioregs-1));
	wrreg(pp, Riotop0hi, (isa->port+ct->nioregs-1)>>8);
	wrreg(pp, Rwe, we | (1<<6));

	/* only touch Rconfig if it is present */
	if(pp->cpresent & (1<<Rconfig)){
		/*  Reset adapter */
		m = pcmmap(slotno, pp->caddr + Rconfig, 1, 1);
		p = (uchar*)(KZERO|(m->isa + pp->caddr + Rconfig - m->ca));

		/* set configuration and interrupt type */
		x = ct->index;
		if((ct->irqtype & 0x20) && ((ct->irqtype & 0x40)==0 || isa->irq>7))
			x |= Clevel;
		*p = x;
		delay(5);

		pcmunmap(slotno, m);
	}
	return 0;
}

/*
 *  read and crack the card information structure enough to set
 *  important parameters like power
 */
static void	tcfig(Slot*, int);
static void	tentry(Slot*, int);
static void	tvers1(Slot*, int);

static void (*parse[256])(Slot*, int) =
{
[0x15]	tvers1,
[0x1A]	tcfig,
[0x1B]	tentry,
};

static int
readc(Slot *pp, uchar *x)
{
	if(pp->cispos >= Mchunk)
		return 0;
	*x = pp->cisbase[2*pp->cispos];
	pp->cispos++;
	return 1;
}

static void
cisread(Slot *pp)
{
	uchar link;
	uchar type;
	int this, i;
	PCMmap *m;

	memset(pp->ctab, 0, sizeof(pp->ctab));
	pp->caddr = 0;
	pp->cpresent = 0;
	pp->configed = 0;
	pp->nctab = 0;

	m = pcmmap(pp->slotno, 0, 0, 1);
	if(m == 0)
{
print("pcmmap fail\n");
		return;
}
	pp->cisbase = (uchar*)(KZERO|m->isa);
print("cisbase %lux\n", pp->cisbase);
	pp->cispos = 0;

	/* loop through all the tuples */
	for(i = 0; i < 1000; i++){
		this = pp->cispos;
		if(readc(pp, &type) != 1)
			break;
print("%x...", type);
		if(type == 0xFF)
			break;
		if(readc(pp, &link) != 1)
			break;
		if(parse[type])
			(*parse[type])(pp, type);
		if(link == 0xff)
			break;
		pp->cispos = this + (2+link);
	}
print("i %d\n", i);
	pcmunmap(pp->slotno, m);
}

static ulong
getlong(Slot *pp, int size)
{
	uchar c;
	int i;
	ulong x;

	x = 0;
	for(i = 0; i < size; i++){
		if(readc(pp, &c) != 1)
			break;
		x |= c<<(i*8);
	}
	return x;
}

static void
tcfig(Slot *pp, int ttype)
{
	uchar size, rasize, rmsize;
	uchar last;

	USED(ttype);
	if(readc(pp, &size) != 1)
		return;
	rasize = (size&0x3) + 1;
	rmsize = ((size>>2)&0xf) + 1;
	if(readc(pp, &last) != 1)
		return;
	pp->caddr = getlong(pp, rasize);
	pp->cpresent = getlong(pp, rmsize);
}

static ulong vexp[8] =
{
	1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
};
static ulong vmant[16] =
{
	10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90,
};

static ulong
microvolt(Slot *pp)
{
	uchar c;
	ulong microvolts;
	ulong exp;

	if(readc(pp, &c) != 1)
		return 0;
	exp = vexp[c&0x7];
	microvolts = vmant[(c>>3)&0xf]*exp;
	while(c & 0x80){
		if(readc(pp, &c) != 1)
			return 0;
		switch(c){
		case 0x7d:
			break;		/* high impedence when sleeping */
		case 0x7e:
		case 0x7f:
			microvolts = 0;	/* no connection */
			break;
		default:
			exp /= 10;
			microvolts += exp*(c&0x7f);
		}
	}
	return microvolts;
}

static ulong
nanoamps(Slot *pp)
{
	uchar c;
	ulong nanoamps;

	if(readc(pp, &c) != 1)
		return 0;
	nanoamps = vexp[c&0x7]*vmant[(c>>3)&0xf];
	while(c & 0x80){
		if(readc(pp, &c) != 1)
			return 0;
		if(c == 0x7d || c == 0x7e || c == 0x7f)
			nanoamps = 0;
	}
	return nanoamps;
}

/*
 *  only nominal voltage is important for config
 */
static ulong
power(Slot *pp)
{
	uchar feature;
	ulong mv;

	mv = 0;
	if(readc(pp, &feature) != 1)
		return 0;
	if(feature & 1)
		mv = microvolt(pp);
	if(feature & 2)
		microvolt(pp);
	if(feature & 4)
		microvolt(pp);
	if(feature & 8)
		nanoamps(pp);
	if(feature & 0x10)
		nanoamps(pp);
	if(feature & 0x20)
		nanoamps(pp);
	if(feature & 0x40)
		nanoamps(pp);
	return mv/1000000;
}

static ulong mantissa[16] =
{ 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, };

static ulong exponent[8] =
{ 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, };

static ulong
ttiming(Slot *pp, int scale)
{
	uchar unscaled;
	ulong nanosecs;

	if(readc(pp, &unscaled) != 1)
		return 0;
	nanosecs = (mantissa[(unscaled>>3)&0xf]*exponent[unscaled&7])/10;
	nanosecs = nanosecs * vexp[scale];
	return nanosecs;
}

static void
timing(Slot *pp, Conftab *ct)
{
	uchar c, i;

	if(readc(pp, &c) != 1)
		return;
	i = c&0x3;
	if(i != 3)
		ct->maxwait = ttiming(pp, i);		/* max wait */
	i = (c>>2)&0x7;
	if(i != 7)
		ct->readywait = ttiming(pp, i);		/* max ready/busy wait */
	i = (c>>5)&0x7;
	if(i != 7)
		ct->otherwait = ttiming(pp, i);		/* reserved wait */
}

static void
iospaces(Slot *pp, Conftab *ct)
{
	uchar c;
	int i;
	ulong len;

	if(readc(pp, &c) != 1)
		return;

	ct->nioregs = 1<<(c&0x1f);
	ct->bit16 = ((c>>5)&3) >= 2;
	if((c & 0x80) == 0)
		return;

	if(readc(pp, &c) != 1)
		return;

	for(i = (c&0xf)+1; i; i--){
		ct->port = getlong(pp, (c>>4)&0x3);
		len = getlong(pp, (c>>6)&0x3);
		USED(len);
	}
}

static void
irq(Slot *pp, Conftab *ct)
{
	uchar c;

	if(readc(pp, &c) != 1)
		return;
	ct->irqtype = c & 0xe0;
	if(c & 0x10)
		ct->irqs = getlong(pp, 2);
	else
		ct->irqs = 1<<(c&0xf);
	ct->irqs &= 0xDEB8;		/* levels available to card */
}

static void
memspace(Slot *pp, int asize, int lsize, int host)
{
	ulong haddress, address, len;

	len = getlong(pp, lsize)*256;
	address = getlong(pp, asize)*256;
	USED(len, address);
	if(host){
		haddress = getlong(pp, asize)*256;
		USED(haddress);
	}
}

static void
tentry(Slot *pp, int ttype)
{
	uchar c, i, feature;
	Conftab *ct;

	USED(ttype);

	if(pp->nctab >= Maxctab)
		return;
	if(readc(pp, &c) != 1)
		return;
	ct = &pp->ctab[pp->nctab++];

	/* copy from last default config */
	if(pp->def)
		*ct = *pp->def;

	ct->index = c & 0x3f;

	/* is this the new default? */
	if(c & 0x40)
		pp->def = ct;

	/* memory wait specified? */
	if(c & 0x80){
		if(readc(pp, &i) != 1)
			return;
		if(i&0x80)
			ct->memwait = 1;
	}

	if(readc(pp, &feature) != 1)
		return;
	switch(feature&0x3){
	case 1:
		ct->vpp1 = ct->vpp2 = power(pp);
		break;
	case 2:
		power(pp);
		ct->vpp1 = ct->vpp2 = power(pp);
		break;
	case 3:
		power(pp);
		ct->vpp1 = power(pp);
		ct->vpp2 = power(pp);
		break;
	default:
		break;
	}
	if(feature&0x4)
		timing(pp, ct);
	if(feature&0x8)
		iospaces(pp, ct);
	if(feature&0x10)
		irq(pp, ct);
	switch((feature>>5)&0x3){
	case 1:
		memspace(pp, 0, 2, 0);
		break;
	case 2:
		memspace(pp, 2, 2, 0);
		break;
	case 3:
		if(readc(pp, &c) != 1)
			return;
		for(i = 0; i <= (c&0x7); i++)
			memspace(pp, (c>>5)&0x3, (c>>3)&0x3, c&0x80);
		break;
	}
	pp->configed++;
}

static void
tvers1(Slot *pp, int ttype)
{
	uchar c, major, minor;
	int  i;

	USED(ttype);
	if(readc(pp, &major) != 1)
{
print("x");
		return;
}
	if(readc(pp, &minor) != 1)
{
print("y");
		return;
}
	for(i = 0; i < sizeof(pp->verstr)-1; i++){
		if(readc(pp, &c) != 1)
			return;
		if(c == 0)
			c = '\n';
		if(c == 0xff)
			break;
		pp->verstr[i] = c;
	}
	pp->verstr[i] = 0;
print("ver %s\n", pp->verstr);
}