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 * $Id: prof_machdep.c,v 1.11 1998/12/14 18:21:34 bde Exp $
30 #include "opt_i586_guprof.h"
31 #include "opt_perfmon.h"
33 #include <sys/param.h>
34 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/sysctl.h>
39 #include <machine/clock.h>
40 #include <machine/perfmon.h>
41 #include <machine/profile.h>
45 #include <machine/asmacros.h>
48 #include <pc98/pc98/pc98.h>
50 #include <i386/isa/isa.h>
52 #include <i386/isa/timerreg.h>
55 #define CPUTIME_CLOCK_UNINITIALIZED 0
56 #define CPUTIME_CLOCK_I8254 1
57 #define CPUTIME_CLOCK_TSC 2
58 #define CPUTIME_CLOCK_I586_PMC 3
59 #define CPUTIME_CLOCK_I8254_SHIFT 7
61 int cputime_bias = 1; /* initialize for locality of reference */
63 static int cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
64 #ifdef I586_PMC_GUPROF
65 static u_int cputime_clock_pmc_conf = I586_PMC_GUPROF;
66 static int cputime_clock_pmc_init;
67 static struct gmonparam saved_gmp;
79 .type __mcount,@function \n\
82 # Check that we are profiling. Do it early for speed. \n\
84 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
87 # __mcount is the same as [.]mcount except the caller \n\
88 # hasn't changed the stack except to call here, so the \n\
89 # caller's raddr is above our raddr. \n\
95 .globl " __XSTRING(HIDENAME(mcount)) " \n\
96 " __XSTRING(HIDENAME(mcount)) ": \n\
97 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
100 # The caller's stack frame has already been built, so \n\
101 # %ebp is the caller's frame pointer. The caller's \n\
102 # raddr is in the caller's frame following the caller's \n\
103 # caller's frame pointer. \n\
105 movl 4(%ebp),%edx \n\
108 # Our raddr is the caller's pc. \n\
116 call " __XSTRING(CNAME(mcount)) " \n\
122 #else /* !__GNUC__ */
124 #endif /* __GNUC__ */
128 * [.]mexitcount saves the return register(s), loads selfpc and calls
129 * mexitcount(selfpc) to do the work. Someday it should be in a machine
130 * dependent file together with cputime(), __mcount and [.]mcount. cputime()
131 * can't just be put in machdep.c because it has to be compiled without -pg.
137 # Dummy label to be seen when gprof -u hides [.]mexitcount. \n\
140 .globl __mexitcount \n\
141 .type __mexitcount,@function \n\
145 GMON_PROF_HIRES = 4 \n\
148 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
149 " __XSTRING(HIDENAME(mexitcount)) ": \n\
150 cmpl $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
151 jne .mexitcount_exit \n\
154 movl 8(%esp),%eax \n\
158 call " __XSTRING(CNAME(mexitcount)) " \n\
163 .mexitcount_exit: \n\
166 #else /* !__GNUC__ */
168 #endif /* __GNUC__ */
171 * Return the time elapsed since the last call. The units are machine-
179 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
180 defined(PERFMON) && defined(I586_PMC_GUPROF)
181 u_quad_t event_count;
184 static u_int prev_count;
186 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
187 if (cputime_clock == CPUTIME_CLOCK_TSC) {
188 count = (u_int)rdtsc();
189 delta = (int)(count - prev_count);
193 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
194 if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
196 * XXX permon_read() should be inlined so that the
197 * perfmon module doesn't need to be compiled with
198 * profiling disabled and so that it is fast.
200 perfmon_read(0, &event_count);
202 count = (u_int)event_count;
203 delta = (int)(count - prev_count);
207 #endif /* PERFMON && I586_PMC_GUPROF */
208 #endif /* (I586_CPU || I686_CPU) && !SMP */
211 * Read the current value of the 8254 timer counter 0.
213 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
214 low = inb(TIMER_CNTR0);
215 high = inb(TIMER_CNTR0);
216 count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
219 * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
220 * While profiling is enabled, this routine is called at least twice
221 * per timer reset (for mcounting and mexitcounting hardclock()),
222 * so at most one reset has occurred since the last call, and one
223 * has occurred iff the current count is larger than the previous
224 * count. This allows counter underflow to be detected faster
225 * than in microtime().
227 delta = prev_count - count;
229 if ((int) delta <= 0)
230 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
235 sysctl_machdep_cputime_clock SYSCTL_HANDLER_ARGS
239 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
244 clock = cputime_clock;
245 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
246 if (clock == CPUTIME_CLOCK_I586_PMC) {
247 pmc.pmc_val = cputime_clock_pmc_conf;
248 clock += pmc.pmc_event;
251 error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
252 if (error == 0 && req->newptr != NULL) {
253 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
254 if (clock >= CPUTIME_CLOCK_I586_PMC) {
255 event = clock - CPUTIME_CLOCK_I586_PMC;
259 pmc.pmc_event = event;
261 pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
263 cputime_clock_pmc_conf = pmc.pmc_val;
264 cputime_clock = CPUTIME_CLOCK_I586_PMC;
268 if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
270 cputime_clock = clock;
276 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
277 0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
280 * The start and stop routines need not be here since we turn off profiling
281 * before calling them. They are here for convenience.
286 struct gmonparam *gp;
288 if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
289 cputime_clock = CPUTIME_CLOCK_I8254;
290 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
292 cputime_clock = CPUTIME_CLOCK_TSC;
295 gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
296 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
297 if (cputime_clock == CPUTIME_CLOCK_TSC)
298 gp->profrate = tsc_freq;
299 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
300 else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
301 if (perfmon_avail() &&
302 perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
303 if (perfmon_start(0) != 0)
306 /* XXX 1 event == 1 us. */
307 gp->profrate = 1000000;
311 /* Zap overheads. They are invalid. */
312 gp->cputime_overhead = 0;
313 gp->mcount_overhead = 0;
314 gp->mcount_post_overhead = 0;
315 gp->mcount_pre_overhead = 0;
316 gp->mexitcount_overhead = 0;
317 gp->mexitcount_post_overhead = 0;
318 gp->mexitcount_pre_overhead = 0;
320 cputime_clock_pmc_init = TRUE;
324 #endif /* PERFMON && I586_PMC_GUPROF */
325 #endif /* (I586_CPU || I686_CPU) && !SMP */
332 struct gmonparam *gp;
334 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
335 if (cputime_clock_pmc_init) {
338 cputime_clock_pmc_init = FALSE;
348 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
349 " __XSTRING(HIDENAME(mexitcount)) ": \n\
352 #else /* !__GNUC__ */
354 #endif /* __GNUC__ */