Subversion Repositories planix.SVN

#include	"u.h"

#include	"../port/lib.h"

#include	"mem.h"

#include	"dat.h"

#include	"fns.h"

#include	"../port/error.h"

#include	"pool.h"

#include	<authsrv.h>

void	(*consdebug)(void) = nil;

void	(*screenputs)(char*, int) = nil;

Queue*	kbdq;			/* unprocessed console input */

Queue*	lineq;			/* processed console input */

Queue*	serialoq;		/* serial console output */

Queue*	kprintoq;		/* console output, for /dev/kprint */

ulong	kprintinuse;		/* test and set whether /dev/kprint is open */

int	iprintscreenputs = 1;

int	panicking;

static struct

{

	QLock;

	int	raw;		/* true if we shouldn't process input */

	Ref	ctl;		/* number of opens to the control file */

	int	x;		/* index into line */

	char	line[1024];	/* current input line */

	int	count;

	int	ctlpoff;

	/* a place to save up characters at interrupt time before dumping them in the queue */

	Lock	lockputc;

	char	istage[1024];

	char	*iw;

	char	*ir;

	char	*ie;

} kbd = {

	.iw	= kbd.istage,

	.ir	= kbd.istage,

	.ie	= kbd.istage + sizeof(kbd.istage),

};

char	*sysname;

vlong	fasthz;

static void	seedrand(void);

static int	readtime(ulong, char*, int);

static int	readbintime(char*, int);

static int	writetime(char*, int);

static int	writebintime(char*, int);

enum

{

	CMhalt,

	CMreboot,

	CMpanic,

};

Cmdtab rebootmsg[] =

{

	CMhalt,		"halt",		1,

	CMreboot,	"reboot",	0,

	CMpanic,	"panic",	0,

};

void

printinit(void)

{

	lineq = qopen(2*1024, 0, nil, nil);

	if(lineq == nil)

		panic("printinit");

	qnoblock(lineq, 1);

}

int

consactive(void)

{

	if(serialoq)

		return qlen(serialoq) > 0;

	return 0;

}

void

prflush(void)

{

	ulong now;

	now = m->ticks;

	while(consactive())

		if(m->ticks - now >= HZ)

			break;

}

/*

 * Log console output so it can be retrieved via /dev/kmesg.

 * This is good for catching boot-time messages after the fact.

 */

struct {

	Lock lk;

	char buf[KMESGSIZE];

	uint n;

} kmesg;

static void

kmesgputs(char *str, int n)

{

	uint nn, d;

	ilock(&kmesg.lk);

	/* take the tail of huge writes */

	if(n > sizeof kmesg.buf){

		d = n - sizeof kmesg.buf;

		str += d;

		n -= d;

	}

	/* slide the buffer down to make room */

	nn = kmesg.n;

	if(nn + n >= sizeof kmesg.buf){

		d = nn + n - sizeof kmesg.buf;

		if(d)

			memmove(kmesg.buf, kmesg.buf+d, sizeof kmesg.buf-d);

		nn -= d;

	}

	/* copy the data in */

	memmove(kmesg.buf+nn, str, n);

	nn += n;

	kmesg.n = nn;

	iunlock(&kmesg.lk);

}

/*

 *   Print a string on the console.  Convert \n to \r\n for serial

 *   line consoles.  Locking of the queues is left up to the screen

 *   or uart code.  Multi-line messages to serial consoles may get

 *   interspersed with other messages.

 */

static void

putstrn0(char *str, int n, int usewrite)

{

	int m;

	char *t;

	if(!islo())

		usewrite = 0;

	/*

	 *  how many different output devices do we need?

	 */

	kmesgputs(str, n);

	/*

	 *  if someone is reading /dev/kprint,

	 *  put the message there.

	 *  if not and there's an attached bit mapped display,

	 *  put the message there.

	 *

	 *  if there's a serial line being used as a console,

	 *  put the message there.

	 */

	if(kprintoq != nil && !qisclosed(kprintoq)){

		if(usewrite)

			qwrite(kprintoq, str, n);

		else

			qiwrite(kprintoq, str, n);

	}else if(screenputs != nil)

		screenputs(str, n);

	if(serialoq == nil){

		uartputs(str, n);

		return;

	}

	while(n > 0) {

		t = memchr(str, '\n', n);

		if(t && !kbd.raw) {

			m = t-str;

			if(usewrite){

				qwrite(serialoq, str, m);

				qwrite(serialoq, "\r\n", 2);

			} else {

				qiwrite(serialoq, str, m);

				qiwrite(serialoq, "\r\n", 2);

			}

			n -= m+1;

			str = t+1;

		} else {

			if(usewrite)

				qwrite(serialoq, str, n);

			else

				qiwrite(serialoq, str, n);

			break;

		}

	}

}

void

putstrn(char *str, int n)

{

	putstrn0(str, n, 0);

}

int noprint;

int

print(char *fmt, ...)

{

	int n;

	va_list arg;

	char buf[PRINTSIZE];

	if(noprint)

		return -1;

	va_start(arg, fmt);

	n = vseprint(buf, buf+sizeof(buf), fmt, arg) - buf;

	va_end(arg);

	putstrn(buf, n);

	return n;

}

/*

 * Want to interlock iprints to avoid interlaced output on 

 * multiprocessor, but don't want to deadlock if one processor

 * dies during print and another has something important to say.

 * Make a good faith effort.

 */

static Lock iprintlock;

static int

iprintcanlock(Lock *l)

{

	int i;

	for(i=0; i<1000; i++){

		if(canlock(l))

			return 1;

		if(l->m == MACHP(m->machno))

			return 0;

		microdelay(100);

	}

	return 0;

}

int

iprint(char *fmt, ...)

{

	int n, s, locked;

	va_list arg;

	char buf[PRINTSIZE];

	s = splhi();

	va_start(arg, fmt);

	n = vseprint(buf, buf+sizeof(buf), fmt, arg) - buf;

	va_end(arg);

	locked = iprintcanlock(&iprintlock);

	if(screenputs != nil && iprintscreenputs)

		screenputs(buf, n);

	uartputs(buf, n);

	if(locked)

		unlock(&iprintlock);

	splx(s);

	return n;

}

void

panic(char *fmt, ...)

{

	int n, s;

	va_list arg;

	char buf[PRINTSIZE];

	kprintoq = nil;	/* don't try to write to /dev/kprint */

	if(panicking)

		for(;;);

	panicking = 1;

	s = splhi();

	strcpy(buf, "panic: ");

	va_start(arg, fmt);

	n = vseprint(buf+strlen(buf), buf+sizeof(buf), fmt, arg) - buf;

	va_end(arg);

	iprint("%s\n", buf);

	if(consdebug)

		(*consdebug)();

	splx(s);

	prflush();

	buf[n] = '\n';

	putstrn(buf, n+1);

	dumpstack();

	exit(1);

}

/* libmp at least contains a few calls to sysfatal; simulate with panic */

void

sysfatal(char *fmt, ...)

{

	char err[256];

	va_list arg;

	va_start(arg, fmt);

	vseprint(err, err + sizeof err, fmt, arg);

	va_end(arg);

	panic("sysfatal: %s", err);

}

void

_assert(char *fmt)

{

	panic("assert failed at %#p: %s", getcallerpc(&fmt), fmt);

}

int

pprint(char *fmt, ...)

{

	int n;

	Chan *c;

	va_list arg;

	char buf[2*PRINTSIZE];

	if(up == nil || up->fgrp == nil)

		return 0;

	c = up->fgrp->fd[2];

	if(c==0 || (c->mode!=OWRITE && c->mode!=ORDWR))

		return 0;

	n = snprint(buf, sizeof buf, "%s %lud: ", up->text, up->pid);

	va_start(arg, fmt);

	n = vseprint(buf+n, buf+sizeof(buf), fmt, arg) - buf;

	va_end(arg);

	if(waserror())

		return 0;

	devtab[c->type]->write(c, buf, n, c->offset);

	poperror();

	lock(c);

	c->offset += n;

	unlock(c);

	return n;

}

static void

echoscreen(char *buf, int n)

{

	char *e, *p;

	char ebuf[128];

	int x;

	p = ebuf;

	e = ebuf + sizeof(ebuf) - 4;

	while(n-- > 0){

		if(p >= e){

			screenputs(ebuf, p - ebuf);

			p = ebuf;

		}

		x = *buf++;

		if(x == 0x15){

			*p++ = '^';

			*p++ = 'U';

			*p++ = '\n';

		} else

			*p++ = x;

	}

	if(p != ebuf)

		screenputs(ebuf, p - ebuf);

}

static void

echoserialoq(char *buf, int n)

{

	char *e, *p;

	char ebuf[128];

	int x;

	p = ebuf;

	e = ebuf + sizeof(ebuf) - 4;

	while(n-- > 0){

		if(p >= e){

			qiwrite(serialoq, ebuf, p - ebuf);

			p = ebuf;

		}

		x = *buf++;

		if(x == '\n'){

			*p++ = '\r';

			*p++ = '\n';

		} else if(x == 0x15){

			*p++ = '^';

			*p++ = 'U';

			*p++ = '\n';

		} else

			*p++ = x;

	}

	if(p != ebuf)

		qiwrite(serialoq, ebuf, p - ebuf);

}

static void

echo(char *buf, int n)

{

	static int ctrlt, pid;

	int x;

	char *e, *p;

	if(n == 0)

		return;

	e = buf+n;

	for(p = buf; p < e; p++){

		switch(*p){

		case 0x10:	/* ^P */

			if(cpuserver && !kbd.ctlpoff){

				active.exiting = 1;

				return;

			}

			break;

		case 0x14:	/* ^T */

			ctrlt++;

			if(ctrlt > 2)

				ctrlt = 2;

			continue;

		}

		if(ctrlt != 2)

			continue;

		/* ^T escapes */

		ctrlt = 0;

		switch(*p){

		case 'S':

			x = splhi();

			dumpstack();

			procdump();

			splx(x);

			return;

		case 's':

			dumpstack();

			return;

		case 'x':

			xsummary();

			ixsummary();

			mallocsummary();

		//	memorysummary();

			pagersummary();

			return;

		case 'd':

			if(consdebug == nil)

				consdebug = rdb;

			else

				consdebug = nil;

			print("consdebug now %#p\n", consdebug);

			return;

		case 'D':

			if(consdebug == nil)

				consdebug = rdb;

			consdebug();

			return;

		case 'p':

			x = spllo();

			procdump();

			splx(x);

			return;

		case 'q':

			scheddump();

			return;

		case 'k':

			killbig("^t ^t k");

			return;

		case 'r':

			exit(0);

			return;

		}

	}

	qproduce(kbdq, buf, n);

	if(kbd.raw)

		return;

	kmesgputs(buf, n);

	if(screenputs != nil)

		echoscreen(buf, n);

	if(serialoq)

		echoserialoq(buf, n);

}

/*

 *  Called by a uart interrupt for console input.

 *

 *  turn '\r' into '\n' before putting it into the queue.

 */

int

kbdcr2nl(Queue*, int ch)

{

	char *next;

	ilock(&kbd.lockputc);		/* just a mutex */

	if(ch == '\r' && !kbd.raw)

		ch = '\n';

	next = kbd.iw+1;

	if(next >= kbd.ie)

		next = kbd.istage;

	if(next != kbd.ir){

		*kbd.iw = ch;

		kbd.iw = next;

	}

	iunlock(&kbd.lockputc);

	return 0;

}

/*

 *  Put character, possibly a rune, into read queue at interrupt time.

 *  Called at interrupt time to process a character.

 */

int

kbdputc(Queue*, int ch)

{

	int i, n;

	char buf[3];

	Rune r;

	char *next;

	if(kbd.ir == nil)

		return 0;		/* in case we're not inited yet */

	ilock(&kbd.lockputc);		/* just a mutex */

	r = ch;

	n = runetochar(buf, &r);

	for(i = 0; i < n; i++){

		next = kbd.iw+1;

		if(next >= kbd.ie)

			next = kbd.istage;

		if(next == kbd.ir)

			break;

		*kbd.iw = buf[i];

		kbd.iw = next;

	}

	iunlock(&kbd.lockputc);

	return 0;

}

/*

 *  we save up input characters till clock time to reduce

 *  per character interrupt overhead.

 */

static void

kbdputcclock(void)

{

	char *iw;

	/* this amortizes cost of qproduce */

	if(kbd.iw != kbd.ir){

		iw = kbd.iw;

		if(iw < kbd.ir){

			echo(kbd.ir, kbd.ie-kbd.ir);

			kbd.ir = kbd.istage;

		}

		if(kbd.ir != iw){

			echo(kbd.ir, iw-kbd.ir);

			kbd.ir = iw;

		}

	}

}

enum{

	Qdir,

	Qbintime,

	Qcons,

	Qconsctl,

	Qcputime,

	Qdrivers,

	Qkmesg,

	Qkprint,

	Qhostdomain,

	Qhostowner,

	Qnull,

	Qosversion,

	Qpgrpid,

	Qpid,

	Qppid,

	Qrandom,

	Qreboot,

	Qswap,

	Qsysname,

	Qsysstat,

	Qtime,

	Quser,

	Qzero,

	Qconfig,

};

enum

{

	VLNUMSIZE=	22,

};

static Dirtab consdir[]={

	".",	{Qdir, 0, QTDIR},	0,		DMDIR|0555,

	"bintime",	{Qbintime},	24,		0664,

	"cons",		{Qcons},	0,		0660,

	"consctl",	{Qconsctl},	0,		0220,

	"cputime",	{Qcputime},	6*NUMSIZE,	0444,

	"drivers",	{Qdrivers},	0,		0444,

	"hostdomain",	{Qhostdomain},	DOMLEN,		0664,

	"hostowner",	{Qhostowner},	0,		0664,

	"kmesg",	{Qkmesg},	0,		0440,

	"kprint",	{Qkprint, 0, QTEXCL},	0,	DMEXCL|0440,

	"null",		{Qnull},	0,		0666,

	"osversion",	{Qosversion},	0,		0444,

	"pgrpid",	{Qpgrpid},	NUMSIZE,	0444,

	"pid",		{Qpid},		NUMSIZE,	0444,

	"ppid",		{Qppid},	NUMSIZE,	0444,

	"random",	{Qrandom},	0,		0444,

	"reboot",	{Qreboot},	0,		0660,

	"swap",		{Qswap},	0,		0664,

	"sysname",	{Qsysname},	0,		0664,

	"sysstat",	{Qsysstat},	0,		0666,

	"time",		{Qtime},	NUMSIZE+3*VLNUMSIZE,	0664,

	"user",		{Quser},	0,		0666,

	"zero",		{Qzero},	0,		0444,

	"config",	{Qconfig},	0,		0444,

};

int

readnum(ulong off, char *buf, ulong n, ulong val, int size)

{

	char tmp[64];

	snprint(tmp, sizeof(tmp), "%*lud", size-1, val);

	tmp[size-1] = ' ';

	if(off >= size)

		return 0;

	if(off+n > size)

		n = size-off;

	memmove(buf, tmp+off, n);

	return n;

}

int

readstr(ulong off, char *buf, ulong n, char *str)

{

	int size;

	size = strlen(str);

	if(off >= size)

		return 0;

	if(off+n > size)

		n = size-off;

	memmove(buf, str+off, n);

	return n;

}

static void

consinit(void)

{

	todinit();

	randominit();

	/*

	 * at 115200 baud, the 1024 char buffer takes 56 ms to process,

	 * processing it every 22 ms should be fine

	 */

	addclock0link(kbdputcclock, 22);

}

static Chan*

consattach(char *spec)

{

	return devattach('c', spec);

}

static Walkqid*

conswalk(Chan *c, Chan *nc, char **name, int nname)

{

	return devwalk(c, nc, name,nname, consdir, nelem(consdir), devgen);

}

static int

consstat(Chan *c, uchar *dp, int n)

{

	return devstat(c, dp, n, consdir, nelem(consdir), devgen);

}

static Chan*

consopen(Chan *c, int omode)

{

	c->aux = nil;

	c = devopen(c, omode, consdir, nelem(consdir), devgen);

	switch((ulong)c->qid.path){

	case Qconsctl:

		incref(&kbd.ctl);

		break;

	case Qkprint:

		if(tas(&kprintinuse) != 0){

			c->flag &= ~COPEN;

			error(Einuse);

		}

		if(kprintoq == nil){

			kprintoq = qopen(8*1024, Qcoalesce, 0, 0);

			if(kprintoq == nil){

				c->flag &= ~COPEN;

				error(Enomem);

			}

			qnoblock(kprintoq, 1);

		}else

			qreopen(kprintoq);

		c->iounit = qiomaxatomic;

		break;

	}

	return c;

}

static void

consclose(Chan *c)

{

	switch((ulong)c->qid.path){

	/* last close of control file turns off raw */

	case Qconsctl:

		if(c->flag&COPEN){

			if(decref(&kbd.ctl) == 0)

				kbd.raw = 0;

		}

		break;

	/* close of kprint allows other opens */

	case Qkprint:

		if(c->flag & COPEN){

			kprintinuse = 0;

			qhangup(kprintoq, nil);

		}

		break;

	}

}

static long

consread(Chan *c, void *buf, long n, vlong off)

{

	ulong l;

	Mach *mp;

	char *b, *bp, ch;

	char tmp[256];		/* must be >= 18*NUMSIZE (Qswap) */

	int i, k, id, send;

	vlong offset = off;

	extern char configfile[];

	if(n <= 0)

		return n;

	switch((ulong)c->qid.path){

	case Qdir:

		return devdirread(c, buf, n, consdir, nelem(consdir), devgen);

	case Qcons:

		qlock(&kbd);

		if(waserror()) {

			qunlock(&kbd);

			nexterror();

		}

		while(!qcanread(lineq)){

			if(qread(kbdq, &ch, 1) == 0)

				continue;

			send = 0;

			if(ch == 0){

				/* flush output on rawoff -> rawon */

				if(kbd.x > 0)

					send = !qcanread(kbdq);

			}else if(kbd.raw){

				kbd.line[kbd.x++] = ch;

				send = !qcanread(kbdq);

			}else{

				switch(ch){

				case '\b':

					if(kbd.x > 0)

						kbd.x--;

					break;

				case 0x15:	/* ^U */

					kbd.x = 0;

					break;

				case '\n':

				case 0x04:	/* ^D */

					send = 1;

				default:

					if(ch != 0x04)

						kbd.line[kbd.x++] = ch;

					break;

				}

			}

			if(send || kbd.x == sizeof kbd.line){

				qwrite(lineq, kbd.line, kbd.x);

				kbd.x = 0;

			}

		}

		n = qread(lineq, buf, n);

		qunlock(&kbd);

		poperror();

		return n;

	case Qcputime:

		k = offset;

		if(k >= 6*NUMSIZE)

			return 0;

		if(k+n > 6*NUMSIZE)

			n = 6*NUMSIZE - k;

		/* easiest to format in a separate buffer and copy out */

		for(i=0; i<6 && NUMSIZE*i<k+n; i++){

			l = up->time[i];

			if(i == TReal)

				l = MACHP(0)->ticks - l;

			l = TK2MS(l);

			readnum(0, tmp+NUMSIZE*i, NUMSIZE, l, NUMSIZE);

		}

		memmove(buf, tmp+k, n);

		return n;

	case Qkmesg:

		/*

		 * This is unlocked to avoid tying up a process

		 * that's writing to the buffer.  kmesg.n never 

		 * gets smaller, so worst case the reader will

		 * see a slurred buffer.

		 */

		if(off >= kmesg.n)

			n = 0;

		else{

			if(off+n > kmesg.n)

				n = kmesg.n - off;

			memmove(buf, kmesg.buf+off, n);

		}

		return n;

	case Qkprint:

		return qread(kprintoq, buf, n);

	case Qpgrpid:

		return readnum((ulong)offset, buf, n, up->pgrp->pgrpid, NUMSIZE);

	case Qpid:

		return readnum((ulong)offset, buf, n, up->pid, NUMSIZE);

	case Qppid:

		return readnum((ulong)offset, buf, n, up->parentpid, NUMSIZE);

	case Qtime:

		return readtime((ulong)offset, buf, n);

	case Qbintime:

		return readbintime(buf, n);

	case Qhostowner: