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/* $OpenBSD: pctr.h,v 1.17 2014/03/29 18:09:29 guenther 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 by leaving this copyright notice intact.
*/
#ifndef _MACHINE_PCTR_H_
#define _MACHINE_PCTR_H_
#include <sys/ioccom.h>
typedef u_int64_t pctrval;
#define PCTR_NUM 4
struct pctrst {
u_int pctr_fn[PCTR_NUM]; /* Current settings of counters */
pctrval pctr_tsc; /* Free-running 64-bit cycle counter */
pctrval pctr_hwc[PCTR_NUM]; /* Values of the hardware counters */
};
/* Bit values in fn fields and PIOCS ioctl's */
#define P5CTR_K 0x40 /* Monitor kernel-level events */
#define P5CTR_U 0x80 /* Monitor user-level events */
#define P5CTR_C 0x100 /* count cycles rather than events */
#define PCTR_U 0x010000 /* Monitor user-level events */
#define PCTR_K 0x020000 /* Monitor kernel-level events */
#define PCTR_E 0x040000 /* Edge detect */
#define PCTR_EN 0x400000 /* Enable counters (counter 0 only) */
#define PCTR_I 0x800000 /* Invert counter mask */
/* Unit Mask bits */
#define PCTR_UM_M 0x0800 /* Modified cache lines */
#define PCTR_UM_E 0x0400 /* Exclusive cache lines */
#define PCTR_UM_S 0x0200 /* Shared cache lines */
#define PCTR_UM_I 0x0100 /* Invalid cache lines */
#define PCTR_UM_MESI (PCTR_UM_M|PCTR_UM_E|PCTR_UM_S|PCTR_UM_I)
#define PCTR_UM_A 0x2000 /* Any initiator */
#define PCTR_UM_SHIFT 8 /* Left shift for unit mask */
#define PCTR_CM_SHIFT 24 /* Left shift for counter mask */
/* ioctl to set which counter a device tracks */
#define PCIOCRD _IOR('c', 1, struct pctrst) /* Read counter value */
#define PCIOCS0 _IOW('c', 8, unsigned int) /* Set counter 0 function */
#define PCIOCS1 _IOW('c', 9, unsigned int) /* Set counter 1 function */
#define PCIOCS2 _IOW('c', 10, unsigned int) /* Set counter 0 function */
#define PCIOCS3 _IOW('c', 11, unsigned int) /* Set counter 1 function */
#define _PATH_PCTR "/dev/pctr"
#define rdtsc() \
({ \
pctrval v; \
__asm volatile ("rdtsc" : "=A" (v)); \
v; \
})
/* Read the performance counters (Pentium Pro only) */
#define rdpmc(ctr) \
({ \
pctrval v; \
__asm volatile ("rdpmc\n" \
"\tandl $0xff, %%edx" \
: "=A" (v) : "c" (ctr)); \
v; \
})
#ifdef _KERNEL
#define rdmsr(msr) \
({ \
pctrval v; \
__asm volatile ("rdmsr" : "=A" (v) : "c" (msr)); \
v; \
})
#define wrmsr(msr, v) \
__asm volatile ("wrmsr" :: "A" ((u_int64_t) (v)), "c" (msr));
void pctrattach(int);
int pctropen(dev_t, int, int, struct proc *);
int pctrclose(dev_t, int, int, struct proc *);
int pctrioctl(dev_t, u_long, caddr_t, int, struct proc *);
#endif /* _KERNEL */
#endif /* ! _MACHINE_PCTR_H_ */
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