ref: fe594760ebddac23e673d189d2152062ef75d8b8
dir: /sys/src/9/port/devcons.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include <authsrv.h>
void (*consdebug)(void) = nil;
void (*screenputs)(char*, int) = nil;
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;
char *sysname;
vlong fasthz;
static int readtime(ulong, char*, int);
static int readbintime(char*, int);
static int writetime(char*, int);
static int writebintime(char*, int);
enum
{
CMreboot,
CMpanic,
CMrdb,
};
Cmdtab rebootmsg[] =
{
CMreboot, "reboot", 0,
CMpanic, "panic", 0,
CMrdb, "rdb", 0,
};
void
printinit(void)
{
}
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;
}
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;
int (*wq)(Queue*, void*, int);
/*
* 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.
*/
wq = usewrite && islo() ? qwrite : qiwrite;
if(kprintoq != nil && !qisclosed(kprintoq))
(*wq)(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 != nil) {
m = t-str;
(*wq)(serialoq, str, m);
(*wq)(serialoq, "\r\n", 2);
n -= m+1;
str = t+1;
} else {
(*wq)(serialoq, str, n);
break;
}
}
}
void
putstrn(char *str, int n)
{
putstrn0(str, n, 0);
}
int
print(char *fmt, ...)
{
int n;
va_list arg;
char buf[PRINTSIZE];
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 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);
vseprint(buf+strlen(buf), buf+sizeof(buf), fmt, arg);
va_end(arg);
iprint("%s\n", buf);
if(consdebug)
(*consdebug)();
splx(s);
prflush();
dumpstack();
/* reboot cpu servers and headless machines when not debugging */
if(getconf("*debug") == nil)
if(cpuserver || !conf.monitor)
exit(1);
/* otherwise, just hang */
while(islo()) idlehands();
for(;;);
}
/* 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==nil || (c->flag&CMSG)!=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;
}
enum{
Qdir,
Qbintime,
Qcons,
Qconsctl,
Qcputime,
Qdrivers,
Qkmesg,
Qkprint,
Qhostdomain,
Qhostowner,
Qnull,
Qosversion,
Qpgrpid,
Qpid,
Qppid,
Qrandom,
Qreboot,
Qsysname,
Qsysstat,
Qtime,
Quser,
Qzero,
Qmordor,
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, 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,
"mordor", {Qmordor}, 0, 0666,
};
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();
}
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 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){
/* 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;
char tmp[256];
int i, k, id;
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:
error(Egreg);
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;
readnum(0, tmp+NUMSIZE*i, NUMSIZE, tk2ms(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:
return readstr((ulong)offset, buf, n, eve);
case Qhostdomain:
return readstr((ulong)offset, buf, n, hostdomain);
case Quser:
return readstr((ulong)offset, buf, n, up->user);
case Qnull:
return 0;
case Qconfig:
return readstr((ulong)offset, buf, n, configfile);
case Qsysstat:
b = smalloc(conf.nmach*(NUMSIZE*11+1) + 1); /* +1 for NUL */
bp = b;
for(id = 0; id < MAXMACH; id++) {
if(active.machs[id]) {
mp = MACHP(id);
readnum(0, bp, NUMSIZE, id, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE, mp->cs, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE, mp->intr, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE, mp->syscall, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE, mp->pfault, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE, mp->tlbfault, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE, mp->tlbpurge, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE, mp->load, NUMSIZE);
bp += NUMSIZE;
l = mp->perf.period;
if(l == 0)
l = 1;
readnum(0, bp, NUMSIZE,
(mp->perf.avg_inidle*100)/l, NUMSIZE);
bp += NUMSIZE;
readnum(0, bp, NUMSIZE,
(mp->perf.avg_inintr*100)/l, NUMSIZE);
bp += NUMSIZE;
*bp++ = '\n';
}
}
if(waserror()){
free(b);
nexterror();
}
n = readstr((ulong)offset, buf, n, b);
free(b);
poperror();
return n;
case Qsysname:
if(sysname == nil)
return 0;
return readstr((ulong)offset, buf, n, sysname);
case Qrandom:
return randomread(buf, n);
case Qdrivers:
b = smalloc(READSTR);
k = 0;
for(i = 0; devtab[i] != nil; i++)
k += snprint(b+k, READSTR-k, "#%C %s\n",
devtab[i]->dc, devtab[i]->name);
if(waserror()){
free(b);
nexterror();
}
n = readstr((ulong)offset, buf, n, b);
poperror();
free(b);
return n;
case Qzero:
memset(buf, 0, n);
return n;
case Qmordor:
error("one does not simply read from mordor");
return 0;
case Qosversion:
snprint(tmp, sizeof tmp, "2000");
n = readstr((ulong)offset, buf, n, tmp);
return n;
default:
print("consread %#llux\n", c->qid.path);
error(Egreg);
}
return -1; /* never reached */
}
static long
conswrite(Chan *c, void *va, long n, vlong off)
{
char buf[256];
long l, bp;
char *a;
Mach *mp;
int id;
ulong offset;
Cmdbuf *cb;
Cmdtab *ct;
a = va;
offset = off;
switch((ulong)c->qid.path){
case Qcons:
/*
* Can't page fault in putstrn, so copy the data locally.
*/
l = n;
while(l > 0){
bp = l;
if(bp > sizeof buf)
bp = sizeof buf;
memmove(buf, a, bp);
putstrn0(buf, bp, 1);
a += bp;
l -= bp;
}
break;
case Qconsctl:
error(Egreg);
case Qtime:
if(!iseve())
error(Eperm);
return writetime(a, n);
case Qbintime:
if(!iseve())
error(Eperm);
return writebintime(a, n);
case Qhostowner:
return hostownerwrite(a, n);
case Qhostdomain:
return hostdomainwrite(a, n);
case Quser:
return userwrite(a, n);
case Qnull:
break;
case Qconfig:
error(Eperm);
break;
case Qreboot:
if(!iseve())
error(Eperm);
cb = parsecmd(a, n);
if(waserror()) {
free(cb);
nexterror();
}
ct = lookupcmd(cb, rebootmsg, nelem(rebootmsg));
switch(ct->index) {
case CMreboot:
rebootcmd(cb->nf-1, cb->f+1);
break;
case CMpanic:
*(ulong*)0=0;
panic("/dev/reboot");
case CMrdb:
if(consdebug == nil)
consdebug = rdb;
consdebug();
break;
}
poperror();
free(cb);
break;
case Qsysstat:
for(id = 0; id < MAXMACH; id++) {
if(active.machs[id]) {
mp = MACHP(id);
mp->cs = 0;
mp->intr = 0;
mp->syscall = 0;
mp->pfault = 0;
mp->tlbfault = 0;
mp->tlbpurge = 0;
}
}
break;
case Qsysname:
if(offset != 0)
error(Ebadarg);
if(n <= 0 || n >= sizeof buf)
error(Ebadarg);
strncpy(buf, a, n);
buf[n] = 0;
if(buf[n-1] == '\n')
buf[n-1] = 0;
kstrdup(&sysname, buf);
break;
case Qmordor:
error("one does not simply write into mordor");
return 0;
default:
print("conswrite: %#llux\n", c->qid.path);
error(Egreg);
}
return n;
}
Dev consdevtab = {
'c',
"cons",
devreset,
consinit,
devshutdown,
consattach,
conswalk,
consstat,
consopen,
devcreate,
consclose,
consread,
devbread,
conswrite,
devbwrite,
devremove,
devwstat,
};
static uvlong uvorder = 0x0001020304050607ULL;
static uchar*
le2vlong(vlong *to, uchar *f)
{
uchar *t, *o;
int i;
t = (uchar*)to;
o = (uchar*)&uvorder;
for(i = 0; i < sizeof(vlong); i++)
t[o[i]] = f[i];
return f+sizeof(vlong);
}
static uchar*
vlong2le(uchar *t, vlong from)
{
uchar *f, *o;
int i;
f = (uchar*)&from;
o = (uchar*)&uvorder;
for(i = 0; i < sizeof(vlong); i++)
t[i] = f[o[i]];
return t+sizeof(vlong);
}
static long order = 0x00010203;
static uchar*
le2long(long *to, uchar *f)
{
uchar *t, *o;
int i;
t = (uchar*)to;
o = (uchar*)ℴ
for(i = 0; i < sizeof(long); i++)
t[o[i]] = f[i];
return f+sizeof(long);
}
static uchar*
long2le(uchar *t, long from)
{
uchar *f, *o;
int i;
f = (uchar*)&from;
o = (uchar*)ℴ
for(i = 0; i < sizeof(long); i++)
t[i] = f[o[i]];
return t+sizeof(long);
}
char *Ebadtimectl = "bad time control";
/*
* like the old #c/time but with added info. Return
*
* secs nanosecs fastticks fasthz
*/
static int
readtime(ulong off, char *buf, int n)
{
vlong nsec, ticks;
long sec;
char str[7*NUMSIZE];
nsec = todget(&ticks);
if(fasthz == 0LL)
fastticks((uvlong*)&fasthz);
sec = nsec/1000000000ULL;
snprint(str, sizeof(str), "%*lud %*llud %*llud %*llud ",
NUMSIZE-1, sec,
VLNUMSIZE-1, nsec,
VLNUMSIZE-1, ticks,
VLNUMSIZE-1, fasthz);
return readstr(off, buf, n, str);
}
/*
* set the time in seconds
*/
static int
writetime(char *buf, int n)
{
char b[13];
long i;
vlong now;
if(n >= sizeof(b))
error(Ebadtimectl);
strncpy(b, buf, n);
b[n] = 0;
i = strtol(b, 0, 0);
if(i <= 0)
error(Ebadtimectl);
now = i*1000000000LL;
todset(now, 0, 0);
return n;
}
/*
* read binary time info. all numbers are little endian.
* ticks and nsec are syncronized.
*/
static int
readbintime(char *buf, int n)
{
int i;
vlong nsec, ticks;
uchar *b = (uchar*)buf;
i = 0;
if(fasthz == 0LL)
fastticks((uvlong*)&fasthz);
nsec = todget(&ticks);
if(n >= 3*sizeof(uvlong)){
vlong2le(b+2*sizeof(uvlong), fasthz);
i += sizeof(uvlong);
}
if(n >= 2*sizeof(uvlong)){
vlong2le(b+sizeof(uvlong), ticks);
i += sizeof(uvlong);
}
if(n >= 8){
vlong2le(b, nsec);
i += sizeof(vlong);
}
return i;
}
/*
* set any of the following
* - time in nsec
* - nsec trim applied over some seconds
* - clock frequency
*/
static int
writebintime(char *buf, int n)
{
uchar *p;
vlong delta;
long period;
n--;
p = (uchar*)buf + 1;
switch(*buf){
case 'n':
if(n < sizeof(vlong))
error(Ebadtimectl);
le2vlong(&delta, p);
todset(delta, 0, 0);
break;
case 'd':
if(n < sizeof(vlong)+sizeof(long))
error(Ebadtimectl);
p = le2vlong(&delta, p);
le2long(&period, p);
todset(-1, delta, period);
break;
case 'f':
if(n < sizeof(uvlong))
error(Ebadtimectl);
le2vlong(&fasthz, p);
if(fasthz <= 0)
error(Ebadtimectl);
todsetfreq(fasthz);
break;
}
return n;
}
void
cpushutdown(void)
{
int ms, once;
once = active.machs[m->machno];
active.machs[m->machno] = 0;
active.exiting = 1;
if(once)
iprint("cpu%d: exiting\n", m->machno);
/* wait for any other processors to shutdown */
spllo();
for(ms = 5*1000; ms > 0; ms -= TK2MS(2)){
delay(TK2MS(2));
if(memchr(active.machs, 1, MAXMACH) == nil && consactive() == 0)
break;
}
}