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/* $OpenBSD: pctr.c,v 1.10 1997/08/16 16:31:18 mickey Exp $ */
/*
* Pentium performance counter driver for OpenBSD.
* Copyright 1996 David Mazieres <dm@lcs.mit.edu>.
*
* Modification and redistribution in source and binary forms is
* permitted provided that due credit is given to the author and the
* OpenBSD project (for instance by leaving this copyright notice
* intact).
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/ioccom.h>
#include <sys/systm.h>
#include <machine/cputypes.h>
#include <machine/psl.h>
#include <machine/pctr.h>
#include <machine/cpu.h>
pctrval pctr_idlcnt; /* Gets incremented in locore.s */
static int usetsc;
static int usep5ctr;
static int usep6ctr;
void pctrattach __P((int));
int pctropen __P((dev_t, int, int, struct proc *));
int pctrclose __P((dev_t, int, int, struct proc *));
int pctrioctl __P((dev_t, int, caddr_t, int, struct proc *));
void
pctrattach (int num)
{
pctrval id;
if (num > 1) {
printf ("Ignoring pctr device #%d\n", num);
printf ("(config file should read `pseudo-device pctr 1')\n");
return;
}
id = __cpuid ();
usetsc = __hastsc (id);
usep5ctr = __hasp5ctr (id);
usep6ctr = __hasp6ctr (id);
if (usep6ctr)
/* Enable RDTSC and RDPMC instructions from user-level. */
__asm __volatile (".byte 0xf,0x20,0xe0 # movl %%cr4,%%eax\n"
"\tandl %0,%%eax\n"
"\torl %1,%%eax\n"
"\t.byte 0xf,0x22,0xe0 # movl %%cr4,%%eax"
:: "i" (~CR4_TSD), "i" (CR4_PCE) : "eax");
else if (usetsc)
/* Enable RDTSC instruction from user-level. */
__asm __volatile (".byte 0xf,0x20,0xe0 # movl %%cr4,%%eax\n"
"\tandl %0,%%eax\n"
"\t.byte 0xf,0x22,0xe0 # movl %%cr4,%%eax"
:: "i" (~CR4_TSD) : "eax");
if (usep6ctr)
printf ("pctr: Pentium Pro user-level "
"performance counters enabled\n");
else if (usep5ctr)
printf ("pctr: Pentium performance counters and user-level "
"cycle counter enabled\n");
else if (usetsc)
printf ("pctr: user-level cycle counter enabled\n");
else
printf ("pctr: no performance counters in CPU\n");
}
int
pctropen (dev_t dev, int oflags, int devtype, struct proc *p)
{
if (minor (dev))
return ENXIO;
return 0;
}
int
pctrclose (dev_t dev, int oflags, int devtype, struct proc *p)
{
return 0;
}
static int
p5ctrsel (int fflag, u_int cmd, u_int fn)
{
pctrval msr11;
int msr;
int shift;
cmd -= PCIOCS0;
if (cmd > 1)
return EINVAL;
msr = P5MSR_CTR0 + cmd;
shift = cmd ? 0x10 : 0;
if (! (fflag & FWRITE))
return EPERM;
if (fn >= 0x200)
return EINVAL;
msr11 = rdmsr (0x11);
msr11 &= ~(0x1ffLL << shift);
msr11 |= fn << shift;
wrmsr (0x11, msr11);
wrmsr (msr, 0);
return 0;
}
static __inline void
p5ctrrd (struct pctrst *st)
{
u_int msr11;
msr11 = rdmsr (P5MSR_CTRSEL);
st->pctr_fn[0] = msr11 & 0xffff;
st->pctr_fn[1] = msr11 >> 16;
__asm __volatile ("cli");
st->pctr_tsc = rdtsc ();
st->pctr_hwc[0] = rdmsr (P5MSR_CTR0);
st->pctr_hwc[1] = rdmsr (P5MSR_CTR1);
__asm __volatile ("sti");
}
static int
p6ctrsel (int fflag, u_int cmd, u_int fn)
{
int msrsel, msrval;
cmd -= PCIOCS0;
if (cmd > 1)
return EINVAL;
msrsel = P6MSR_CTRSEL0 + cmd;
msrval = P6MSR_CTR0 + cmd;
if (! (fflag & FWRITE))
return EPERM;
if (fn & 0x380000)
return EINVAL;
wrmsr (msrval, 0);
wrmsr (msrsel, fn);
wrmsr (msrval, 0);
return 0;
}
static __inline void
p6ctrrd (struct pctrst *st)
{
st->pctr_fn[0] = rdmsr (P6MSR_CTRSEL0);
st->pctr_fn[1] = rdmsr (P6MSR_CTRSEL1);
__asm __volatile ("cli");
st->pctr_tsc = rdtsc ();
st->pctr_hwc[0] = rdpmc (0);
st->pctr_hwc[1] = rdpmc (1);
__asm __volatile ("sti");
}
int
pctrioctl (dev_t dev, int cmd, caddr_t data, int fflag, struct proc *p)
{
switch (cmd) {
case PCIOCRD:
{
struct pctrst *st = (void *) data;
if (usep6ctr)
p6ctrrd (st);
else if (usep5ctr)
p5ctrrd (st);
else {
bzero (st, sizeof (*st));
if (usetsc)
st->pctr_tsc = rdtsc ();
}
st->pctr_idl = pctr_idlcnt;
return 0;
}
case PCIOCS0:
case PCIOCS1:
if (usep6ctr)
return p6ctrsel (fflag, cmd, *(u_int *) data);
if (usep5ctr)
return p5ctrsel (fflag, cmd, *(u_int *) data);
return ENODEV;
default:
return EINVAL;
}
}
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