ethermii.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#ifdef FS
#include "all.h"
#include "io.h"
#include "mem.h"
#include "../ip/ip.h"
#else

#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "../port/netif.h"
#endif			/* FS */

#include "etherif.h"
#include "ethermii.h"

#include "compat.h"

int
mii(Mii* mii, int mask)
{
	MiiPhy *miiphy;
	int bit, phyno, r, rmask;

	/*
	 * Probe through mii for PHYs in mask;
	 * return the mask of those found in the current probe.
	 * If the PHY has not already been probed, update
	 * the Mii information.
	 */
	rmask = 0;
	for(phyno = 0; phyno < NMiiPhy; phyno++){
		bit = 1<<phyno;
		if(!(mask & bit))
			continue;
		if(mii->mask & bit){
			rmask |= bit;
			continue;
		}
		if(mii->mir(mii, phyno, Bmsr) == -1)
			continue;
		if((miiphy = malloc(sizeof(MiiPhy))) == nil)
			continue;

		miiphy->mii = mii;
		r = mii->mir(mii, phyno, Phyidr1);
		miiphy->oui = (r & 0x3FFF)<<6;
		r = mii->mir(mii, phyno, Phyidr2);
		miiphy->oui |= r>>10;
		miiphy->phyno = phyno;

		miiphy->anar = ~0;
		miiphy->fc = ~0;
		miiphy->mscr = ~0;

		mii->phy[phyno] = miiphy;
		if(mii->curphy == nil)
			mii->curphy = miiphy;
		mii->mask |= bit;
		mii->nphy++;

		rmask |= bit;
	}
	return rmask;
}

int
miimir(Mii* mii, int r)
{
	if(mii == nil || mii->ctlr == nil || mii->curphy == nil)
		return -1;
	return mii->mir(mii, mii->curphy->phyno, r);
}

int
miimiw(Mii* mii, int r, int data)
{
	if(mii == nil || mii->ctlr == nil || mii->curphy == nil)
		return -1;
	return mii->miw(mii, mii->curphy->phyno, r, data);
}

int
miireset(Mii* mii)
{
	int bmcr;

	if(mii == nil || mii->ctlr == nil || mii->curphy == nil)
		return -1;
	bmcr = mii->mir(mii, mii->curphy->phyno, Bmcr);
	bmcr |= BmcrR;
	mii->miw(mii, mii->curphy->phyno, Bmcr, bmcr);
	microdelay(1);

	return 0;
}

int
miiane(Mii* mii, int a, int p, int e)
{
	int anar, bmsr, mscr, r, phyno;

	if(mii == nil || mii->ctlr == nil || mii->curphy == nil)
		return -1;
	phyno = mii->curphy->phyno;

	bmsr = mii->mir(mii, phyno, Bmsr);
	if(!(bmsr & BmsrAna))
		return -1;

	if(a != ~0)
		anar = (AnaTXFD|AnaTXHD|Ana10FD|Ana10HD) & a;
	else if(mii->curphy->anar != ~0)
		anar = mii->curphy->anar;
	else{
		anar = mii->mir(mii, phyno, Anar);
		anar &= ~(AnaAP|AnaP|AnaT4|AnaTXFD|AnaTXHD|Ana10FD|Ana10HD);
		if(bmsr & Bmsr10THD)
			anar |= Ana10HD;
		if(bmsr & Bmsr10TFD)
			anar |= Ana10FD;
		if(bmsr & Bmsr100TXHD)
			anar |= AnaTXHD;
		if(bmsr & Bmsr100TXFD)
			anar |= AnaTXFD;
	}
	mii->curphy->anar = anar;

	if(p != ~0)
		anar |= (AnaAP|AnaP) & p;
	else if(mii->curphy->fc != ~0)
		anar |= mii->curphy->fc;
	mii->curphy->fc = (AnaAP|AnaP) & anar;

	if(bmsr & BmsrEs){
		mscr = mii->mir(mii, phyno, Mscr);
		mscr &= ~(Mscr1000TFD|Mscr1000THD);
		if(e != ~0)
			mscr |= (Mscr1000TFD|Mscr1000THD) & e;
		else if(mii->curphy->mscr != ~0)
			mscr = mii->curphy->mscr;
		else{
			r = mii->mir(mii, phyno, Esr);
			if(r & Esr1000THD)
				mscr |= Mscr1000THD;
			if(r & Esr1000TFD)
				mscr |= Mscr1000TFD;
		}
		mii->curphy->mscr = mscr;
		mii->miw(mii, phyno, Mscr, mscr);
	}
	mii->miw(mii, phyno, Anar, anar);

	r = mii->mir(mii, phyno, Bmcr);
	if(!(r & BmcrR)){
		r |= BmcrAne|BmcrRan;
		mii->miw(mii, phyno, Bmcr, r);
	}

	return 0;
}

int
miistatus(Mii* mii)
{
	MiiPhy *phy;
	int anlpar, bmsr, p, r, phyno;

	if(mii == nil || mii->ctlr == nil || mii->curphy == nil)
		return -1;
	phy = mii->curphy;
	phyno = phy->phyno;

	/*
	 * Check Auto-Negotiation is complete and link is up.
	 * (Read status twice as the Ls bit is sticky).
	 */
	bmsr = mii->mir(mii, phyno, Bmsr);
	if(!(bmsr & (BmsrAnc|BmsrAna)))
{
//print("miistatus 1\n");
		return -1;
}

	bmsr = mii->mir(mii, phyno, Bmsr);
	if(!(bmsr & BmsrLs)){
//print("miistatus 2\n");
		phy->link = 0;
		return -1;
	}

	phy->speed = phy->fd = phy->rfc = phy->tfc = 0;
	if(phy->mscr){
		r = mii->mir(mii, phyno, Mssr);
		if((phy->mscr & Mscr1000TFD) && (r & Mssr1000TFD)){
			phy->speed = 1000;
			phy->fd = 1;
		}
		else if((phy->mscr & Mscr1000THD) && (r & Mssr1000THD))
			phy->speed = 1000;
	}

	anlpar = mii->mir(mii, phyno, Anlpar);
	if(phy->speed == 0){
		r = phy->anar & anlpar;
		if(r & AnaTXFD){
			phy->speed = 100;
			phy->fd = 1;
		}
		else if(r & AnaTXHD)
			phy->speed = 100;
		else if(r & Ana10FD){
			phy->speed = 10;
			phy->fd = 1;
		}
		else if(r & Ana10HD)
			phy->speed = 10;
	}
	if(phy->speed == 0)
{
//print("miistatus 3\n");
		return -1;
}

	if(phy->fd){
		p = phy->fc;
		r = anlpar & (AnaAP|AnaP);
		if(p == AnaAP && r == (AnaAP|AnaP))
			phy->tfc = 1;
		else if(p == (AnaAP|AnaP) && r == AnaAP)
			phy->rfc = 1;
		else if((p & AnaP) && (r & AnaP))
			phy->rfc = phy->tfc = 1;
	}

	phy->link = 1;

	return 0;
}