1 /* $OpenBSD: pctr.h,v 1.12 2003/05/27 23:52:01 fgsch Exp $ */
2
3 /*
4 * Pentium performance counter driver for OpenBSD.
5 * Copyright 1996 David Mazieres <dm@lcs.mit.edu>.
6 *
7 * Modification and redistribution in source and binary forms is
8 * permitted provided that due credit is given to the author and the
9 * OpenBSD project by leaving this copyright notice intact.
10 */
11
12 #ifndef _I386_PCTR_H_
13 #define _I386_PCTR_H_
14
15 #include <sys/ioccom.h>
16
17 typedef u_quad_t pctrval;
18
19 #define PCTR_NUM 2
20
21 struct pctrst {
22 u_int pctr_fn[PCTR_NUM]; /* Current settings of hardware counters */
23 pctrval pctr_tsc; /* Free-running 64-bit cycle counter */
24 pctrval pctr_hwc[PCTR_NUM]; /* Values of the hardware counters */
25 pctrval pctr_idl; /* Iterations of the idle loop */
26 };
27
28 /* Bit values in fn fields and PIOCS ioctl's */
29 #define P5CTR_K 0x40 /* Monitor kernel-level events */
30 #define P5CTR_U 0x80 /* Monitor user-level events */
31 #define P5CTR_C 0x100 /* count cycles rather than events */
32
33 #define P6CTR_U 0x010000 /* Monitor user-level events */
34 #define P6CTR_K 0x020000 /* Monitor kernel-level events */
35 #define P6CTR_E 0x040000 /* Edge detect */
36 #define P6CTR_EN 0x400000 /* Enable counters (counter 0 only) */
37 #define P6CTR_I 0x800000 /* Invert counter mask */
38
39 /* Unit Mask bits */
40 #define P6CTR_UM_M 0x0800 /* Modified cache lines */
41 #define P6CTR_UM_E 0x0400 /* Exclusive cache lines */
42 #define P6CTR_UM_S 0x0200 /* Shared cache lines */
43 #define P6CTR_UM_I 0x0100 /* Invalid cache lines */
44 #define P6CTR_UM_MESI (P6CTR_UM_M|P6CTR_UM_E|P6CTR_UM_S|P6CTR_UM_I)
45 #define P6CTR_UM_A 0x2000 /* Any initiator (as opposed to self) */
46
47 #define P6CTR_CM_SHIFT 24 /* Left shift for counter mask */
48
49 /* ioctl to set which counter a device tracks. */
50 #define PCIOCRD _IOR('c', 1, struct pctrst) /* Read counter value */
51 #define PCIOCS0 _IOW('c', 8, unsigned int) /* Set counter 0 function */
52 #define PCIOCS1 _IOW('c', 9, unsigned int) /* Set counter 1 function */
53
54 #define _PATH_PCTR "/dev/pctr"
55
56 #define rdtsc() \
57 ({ \
58 pctrval v; \
59 __asm __volatile ("rdtsc" : "=A" (v)); \
60 v; \
61 })
62
63 /* Read the performance counters (Pentium Pro only) */
64 #define rdpmc(ctr) \
65 ({ \
66 pctrval v; \
67 __asm __volatile ("rdpmc\n" \
68 "\tandl $0xff, %%edx" \
69 : "=A" (v) : "c" (ctr)); \
70 v; \
71 })
72
73 #ifdef _KERNEL
74
75 #define rdmsr(msr) \
76 ({ \
77 pctrval v; \
78 __asm __volatile ("rdmsr" : "=A" (v) : "c" (msr)); \
79 v; \
80 })
81
82 #define wrmsr(msr, v) \
83 __asm __volatile ("wrmsr" :: "A" ((u_quad_t) (v)), "c" (msr));
84
85 #endif /* _KERNEL */
86 #endif /* ! _I386_PCTR_H_ */