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/i386/isa/Attic/prof_machdep.c,v 1.2 2003/06/17 04:28:37 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 <i386/isa/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\
96 .globl " __XSTRING(HIDENAME(mcount)) " \n\
97 " __XSTRING(HIDENAME(mcount)) ": \n\
98 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
101 # The caller's stack frame has already been built, so \n\
102 # %ebp is the caller's frame pointer. The caller's \n\
103 # raddr is in the caller's frame following the caller's \n\
104 # caller's frame pointer. \n\
106 movl 4(%ebp),%edx \n\
109 # Our raddr is the caller's pc. \n\
117 call " __XSTRING(CNAME(mcount)) " \n\
123 #else /* !__GNUC__ */
125 #endif /* __GNUC__ */
129 * [.]mexitcount saves the return register(s), loads selfpc and calls
130 * mexitcount(selfpc) to do the work. Someday it should be in a machine
131 * dependent file together with cputime(), __mcount and [.]mcount. cputime()
132 * can't just be put in machdep.c because it has to be compiled without -pg.
138 # Dummy label to be seen when gprof -u hides [.]mexitcount. \n\
141 .globl __mexitcount \n\
142 .type __mexitcount,@function \n\
146 GMON_PROF_HIRES = 4 \n\
149 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
150 " __XSTRING(HIDENAME(mexitcount)) ": \n\
151 cmpl $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
152 jne .mexitcount_exit \n\
155 movl 8(%esp),%eax \n\
159 call " __XSTRING(CNAME(mexitcount)) " \n\
164 .mexitcount_exit: \n\
167 #else /* !__GNUC__ */
169 #endif /* __GNUC__ */
172 * Return the time elapsed since the last call. The units are machine-
180 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
181 defined(PERFMON) && defined(I586_PMC_GUPROF)
182 u_quad_t event_count;
185 static u_int prev_count;
187 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
188 if (cputime_clock == CPUTIME_CLOCK_TSC) {
189 count = (u_int)rdtsc();
190 delta = (int)(count - prev_count);
194 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
195 if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
197 * XXX permon_read() should be inlined so that the
198 * perfmon module doesn't need to be compiled with
199 * profiling disabled and so that it is fast.
201 perfmon_read(0, &event_count);
203 count = (u_int)event_count;
204 delta = (int)(count - prev_count);
208 #endif /* PERFMON && I586_PMC_GUPROF */
209 #endif /* (I586_CPU || I686_CPU) && !SMP */
212 * Read the current value of the 8254 timer counter 0.
214 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
215 low = inb(TIMER_CNTR0);
216 high = inb(TIMER_CNTR0);
217 count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
220 * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
221 * While profiling is enabled, this routine is called at least twice
222 * per timer reset (for mcounting and mexitcounting hardclock()),
223 * so at most one reset has occurred since the last call, and one
224 * has occurred iff the current count is larger than the previous
225 * count. This allows counter underflow to be detected faster
226 * than in microtime().
228 delta = prev_count - count;
230 if ((int) delta <= 0)
231 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
236 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
240 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
245 clock = cputime_clock;
246 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
247 if (clock == CPUTIME_CLOCK_I586_PMC) {
248 pmc.pmc_val = cputime_clock_pmc_conf;
249 clock += pmc.pmc_event;
252 error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
253 if (error == 0 && req->newptr != NULL) {
254 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
255 if (clock >= CPUTIME_CLOCK_I586_PMC) {
256 event = clock - CPUTIME_CLOCK_I586_PMC;
260 pmc.pmc_event = event;
262 pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
264 cputime_clock_pmc_conf = pmc.pmc_val;
265 cputime_clock = CPUTIME_CLOCK_I586_PMC;
269 if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
271 cputime_clock = clock;
277 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
278 0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
281 * The start and stop routines need not be here since we turn off profiling
282 * before calling them. They are here for convenience.
287 struct gmonparam *gp;
289 if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
290 cputime_clock = CPUTIME_CLOCK_I8254;
291 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
293 cputime_clock = CPUTIME_CLOCK_TSC;
296 gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
297 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
298 if (cputime_clock == CPUTIME_CLOCK_TSC)
299 gp->profrate = tsc_freq;
300 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
301 else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
302 if (perfmon_avail() &&
303 perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
304 if (perfmon_start(0) != 0)
307 /* XXX 1 event == 1 us. */
308 gp->profrate = 1000000;
312 /* Zap overheads. They are invalid. */
313 gp->cputime_overhead = 0;
314 gp->mcount_overhead = 0;
315 gp->mcount_post_overhead = 0;
316 gp->mcount_pre_overhead = 0;
317 gp->mexitcount_overhead = 0;
318 gp->mexitcount_post_overhead = 0;
319 gp->mexitcount_pre_overhead = 0;
321 cputime_clock_pmc_init = TRUE;
325 #endif /* PERFMON && I586_PMC_GUPROF */
326 #endif /* (I586_CPU || I686_CPU) && !SMP */
333 struct gmonparam *gp;
335 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
336 if (cputime_clock_pmc_init) {
339 cputime_clock_pmc_init = FALSE;
349 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
350 " __XSTRING(HIDENAME(mexitcount)) ": \n\
353 #else /* !__GNUC__ */
355 #endif /* __GNUC__ */