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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#define LRES 3 /* log of PC resolution */
#define SZ 4 /* sizeof of count cell; well known as 4 */
struct
{
int minpc;
int maxpc;
int nbuf;
int time;
ulong *buf;
}kprof;
enum{
Kprofdirqid,
Kprofdataqid,
Kprofctlqid,
};
Dirtab kproftab[]={
".", {Kprofdirqid, 0, QTDIR}, 0, DMDIR|0550,
"kpdata", {Kprofdataqid}, 0, 0600,
"kpctl", {Kprofctlqid}, 0, 0600,
};
static void
_kproftimer(ulong pc)
{
extern void spldone(void);
if(kprof.time == 0)
return;
/*
* if the pc is coming out of spllo or splx,
* use the pc saved when we went splhi.
*/
if(pc>=(ulong)spllo && pc<=(ulong)spldone)
pc = m->splpc;
kprof.buf[0] += TK2MS(1);
if(kprof.minpc<=pc && pc<kprof.maxpc){
pc -= kprof.minpc;
pc >>= LRES;
kprof.buf[pc] += TK2MS(1);
}else
kprof.buf[1] += TK2MS(1);
}
static void
kprofinit(void)
{
if(SZ != sizeof kprof.buf[0])
panic("kprof size");
kproftimer = _kproftimer;
}
static Chan*
kprofattach(char *spec)
{
ulong n;
/* allocate when first used */
kprof.minpc = KTZERO;
kprof.maxpc = (ulong)etext;
kprof.nbuf = (kprof.maxpc-kprof.minpc) >> LRES;
n = kprof.nbuf*SZ;
if(kprof.buf == 0) {
kprof.buf = xalloc(n);
if(kprof.buf == 0)
error(Enomem);
}
kproftab[1].length = n;
return devattach('K', spec);
}
static Walkqid*
kprofwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, kproftab, nelem(kproftab), devgen);
}
static int
kprofstat(Chan *c, uchar *db, int n)
{
return devstat(c, db, n, kproftab, nelem(kproftab), devgen);
}
static Chan*
kprofopen(Chan *c, int omode)
{
if(c->qid.type == QTDIR){
if(omode != OREAD)
error(Eperm);
}
c->mode = openmode(omode);
c->flag |= COPEN;
c->offset = 0;
return c;
}
static void
kprofclose(Chan*)
{
}
static long
kprofread(Chan *c, void *va, long n, vlong off)
{
ulong end;
ulong w, *bp;
uchar *a, *ea;
ulong offset = off;
switch((int)c->qid.path){
case Kprofdirqid:
return devdirread(c, va, n, kproftab, nelem(kproftab), devgen);
case Kprofdataqid:
end = kprof.nbuf*SZ;
if(offset & (SZ-1))
error(Ebadarg);
if(offset >= end){
n = 0;
break;
}
if(offset+n > end)
n = end-offset;
n &= ~(SZ-1);
a = va;
ea = a + n;
bp = kprof.buf + offset/SZ;
while(a < ea){
w = *bp++;
*a++ = w>>24;
*a++ = w>>16;
*a++ = w>>8;
*a++ = w>>0;
}
break;
default:
n = 0;
break;
}
return n;
}
static long
kprofwrite(Chan *c, void *a, long n, vlong)
{
switch((int)(c->qid.path)){
case Kprofctlqid:
if(strncmp(a, "startclr", 8) == 0){
memset((char *)kprof.buf, 0, kprof.nbuf*SZ);
kprof.time = 1;
}else if(strncmp(a, "start", 5) == 0)
kprof.time = 1;
else if(strncmp(a, "stop", 4) == 0)
kprof.time = 0;
break;
default:
error(Ebadusefd);
}
return n;
}
Dev kprofdevtab = {
'K',
"kprof",
devreset,
kprofinit,
devshutdown,
kprofattach,
kprofwalk,
kprofstat,
kprofopen,
devcreate,
kprofclose,
kprofread,
devbread,
kprofwrite,
devbwrite,
devremove,
devwstat,
};
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