2 * Copyright (c) 1996 Bruce D. Evans.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/i386/isa/prof_machdep.c,v 1.14.2.1 2000/08/03 00:09:30 ps Exp $
27 * $DragonFly: src/sys/platform/pc32/isa/prof_machdep.c,v 1.4 2003/08/15 18:37:15 dillon Exp $
31 #include "opt_i586_guprof.h"
32 #include "opt_perfmon.h"
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/sysctl.h>
40 #include <machine/clock.h>
41 #include <machine/perfmon.h>
42 #include <machine/profile.h>
46 #include <machine/asmacros.h>
49 #include <pc98/pc98/pc98.h>
51 #include <bus/isa/i386/isa.h>
53 #include <i386/isa/timerreg.h>
56 #define CPUTIME_CLOCK_UNINITIALIZED 0
57 #define CPUTIME_CLOCK_I8254 1
58 #define CPUTIME_CLOCK_TSC 2
59 #define CPUTIME_CLOCK_I586_PMC 3
60 #define CPUTIME_CLOCK_I8254_SHIFT 7
62 int cputime_bias = 1; /* initialize for locality of reference */
64 static int cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
65 #ifdef I586_PMC_GUPROF
66 static u_int cputime_clock_pmc_conf = I586_PMC_GUPROF;
67 static int cputime_clock_pmc_init;
68 static struct gmonparam saved_gmp;
80 .type __mcount,@function \n\
83 # Check that we are profiling. Do it early for speed. \n\
85 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
88 # __mcount is the same as [.]mcount except the caller \n\
89 # hasn't changed the stack except to call here, so the \n\
90 # caller's raddr is above our raddr. \n\
95 movl 12+4(%esp),%edx \n\
99 .globl " __XSTRING(HIDENAME(mcount)) " \n\
100 " __XSTRING(HIDENAME(mcount)) ": \n\
101 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
104 # The caller's stack frame has already been built, so \n\
105 # %ebp is the caller's frame pointer. The caller's \n\
106 # raddr is in the caller's frame following the caller's \n\
107 # caller's frame pointer. \n\
112 movl 4(%ebp),%edx \n\
115 # Our raddr is the caller's pc. \n\
123 call " __XSTRING(CNAME(mcount)) " \n\
132 #else /* !__GNUC__ */
134 #endif /* __GNUC__ */
138 * [.]mexitcount saves the return register(s), loads selfpc and calls
139 * mexitcount(selfpc) to do the work. Someday it should be in a machine
140 * dependent file together with cputime(), __mcount and [.]mcount. cputime()
141 * can't just be put in machdep.c because it has to be compiled without -pg.
147 # Dummy label to be seen when gprof -u hides [.]mexitcount. \n\
150 .globl __mexitcount \n\
151 .type __mexitcount,@function \n\
155 GMON_PROF_HIRES = 4 \n\
158 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
159 " __XSTRING(HIDENAME(mexitcount)) ": \n\
160 cmpl $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
161 jne .mexitcount_exit \n\
165 movl 12(%esp),%eax \n\
169 call " __XSTRING(CNAME(mexitcount)) " \n\
175 .mexitcount_exit: \n\
178 #else /* !__GNUC__ */
180 #endif /* __GNUC__ */
183 * Return the time elapsed since the last call. The units are machine-
191 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
192 defined(PERFMON) && defined(I586_PMC_GUPROF)
193 u_quad_t event_count;
196 static u_int prev_count;
198 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
199 if (cputime_clock == CPUTIME_CLOCK_TSC) {
200 count = (u_int)rdtsc();
201 delta = (int)(count - prev_count);
205 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
206 if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
208 * XXX permon_read() should be inlined so that the
209 * perfmon module doesn't need to be compiled with
210 * profiling disabled and so that it is fast.
212 perfmon_read(0, &event_count);
214 count = (u_int)event_count;
215 delta = (int)(count - prev_count);
219 #endif /* PERFMON && I586_PMC_GUPROF */
220 #endif /* (I586_CPU || I686_CPU) && !SMP */
223 * Read the current value of the 8254 timer counter 0.
225 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
226 low = inb(TIMER_CNTR0);
227 high = inb(TIMER_CNTR0);
228 count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
231 * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
232 * While profiling is enabled, this routine is called at least twice
233 * per timer reset (for mcounting and mexitcounting hardclock()),
234 * so at most one reset has occurred since the last call, and one
235 * has occurred iff the current count is larger than the previous
236 * count. This allows counter underflow to be detected faster
237 * than in microtime().
239 delta = prev_count - count;
241 if ((int) delta <= 0)
242 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
247 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
251 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
256 clock = cputime_clock;
257 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
258 if (clock == CPUTIME_CLOCK_I586_PMC) {
259 pmc.pmc_val = cputime_clock_pmc_conf;
260 clock += pmc.pmc_event;
263 error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
264 if (error == 0 && req->newptr != NULL) {
265 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
266 if (clock >= CPUTIME_CLOCK_I586_PMC) {
267 event = clock - CPUTIME_CLOCK_I586_PMC;
271 pmc.pmc_event = event;
273 pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
275 cputime_clock_pmc_conf = pmc.pmc_val;
276 cputime_clock = CPUTIME_CLOCK_I586_PMC;
280 if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
282 cputime_clock = clock;
288 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
289 0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
292 * The start and stop routines need not be here since we turn off profiling
293 * before calling them. They are here for convenience.
298 struct gmonparam *gp;
300 if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
301 cputime_clock = CPUTIME_CLOCK_I8254;
302 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
304 cputime_clock = CPUTIME_CLOCK_TSC;
307 gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
308 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
309 if (cputime_clock == CPUTIME_CLOCK_TSC)
310 gp->profrate = tsc_freq;
311 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
312 else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
313 if (perfmon_avail() &&
314 perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
315 if (perfmon_start(0) != 0)
318 /* XXX 1 event == 1 us. */
319 gp->profrate = 1000000;
323 /* Zap overheads. They are invalid. */
324 gp->cputime_overhead = 0;
325 gp->mcount_overhead = 0;
326 gp->mcount_post_overhead = 0;
327 gp->mcount_pre_overhead = 0;
328 gp->mexitcount_overhead = 0;
329 gp->mexitcount_post_overhead = 0;
330 gp->mexitcount_pre_overhead = 0;
332 cputime_clock_pmc_init = TRUE;
336 #endif /* PERFMON && I586_PMC_GUPROF */
337 #endif /* (I586_CPU || I686_CPU) && !SMP */
344 struct gmonparam *gp;
346 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
347 if (cputime_clock_pmc_init) {
350 cputime_clock_pmc_init = FALSE;
360 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
361 " __XSTRING(HIDENAME(mexitcount)) ": \n\
364 #else /* !__GNUC__ */
366 #endif /* __GNUC__ */