kernel: Make SMP support default (and non-optional).
[dragonfly.git] / sys / platform / pc32 / isa / prof_machdep.c
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1/*-
2 * Copyright (c) 1996 Bruce D. Evans.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/i386/isa/prof_machdep.c,v 1.14.2.1 2000/08/03 00:09:30 ps Exp $
27 */
28
29#ifdef GUPROF
30#include "opt_i586_guprof.h"
31#include "opt_perfmon.h"
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/gmon.h>
36#include <sys/kernel.h>
37#include <sys/sysctl.h>
38
39#include <machine/clock.h>
40#include <machine/perfmon.h>
41#include <machine/profile.h>
42#undef MCOUNT
43#endif
44
45#include <machine/asmacros.h>
46
21ce0dfa 47#include <bus/isa/isa.h>
a9295349 48#include <machine_base/isa/timerreg.h>
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49
50#ifdef GUPROF
51#define CPUTIME_CLOCK_UNINITIALIZED 0
52#define CPUTIME_CLOCK_I8254 1
53#define CPUTIME_CLOCK_TSC 2
54#define CPUTIME_CLOCK_I586_PMC 3
55#define CPUTIME_CLOCK_I8254_SHIFT 7
56
57int cputime_bias = 1; /* initialize for locality of reference */
58
59static int cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
60#ifdef I586_PMC_GUPROF
61static u_int cputime_clock_pmc_conf = I586_PMC_GUPROF;
62static int cputime_clock_pmc_init;
63static struct gmonparam saved_gmp;
64#endif
65#endif /* GUPROF */
66
67#ifdef __GNUC__
68__asm(" \n\
69GM_STATE = 0 \n\
70GMON_PROF_OFF = 3 \n\
71 \n\
72 .text \n\
73 .p2align 4,0x90 \n\
74 .globl __mcount \n\
75 .type __mcount,@function \n\
76__mcount: \n\
77 # \n\
78 # Check that we are profiling. Do it early for speed. \n\
79 # \n\
80 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
81 je .mcount_exit \n\
82 # \n\
83 # __mcount is the same as [.]mcount except the caller \n\
84 # hasn't changed the stack except to call here, so the \n\
85 # caller's raddr is above our raddr. \n\
86 # \n\
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87 pushl %eax \n\
88 pushl %ecx \n\
89 pushl %edx \n\
90 movl 12+4(%esp),%edx \n\
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91 jmp .got_frompc \n\
92 \n\
93 .p2align 4,0x90 \n\
94 .globl " __XSTRING(HIDENAME(mcount)) " \n\
95" __XSTRING(HIDENAME(mcount)) ": \n\
96 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
97 je .mcount_exit \n\
98 # \n\
99 # The caller's stack frame has already been built, so \n\
100 # %ebp is the caller's frame pointer. The caller's \n\
101 # raddr is in the caller's frame following the caller's \n\
102 # caller's frame pointer. \n\
103 # \n\
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104 pushl %eax \n\
105 pushl %ecx \n\
106 pushl %edx \n\
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107 movl 4(%ebp),%edx \n\
108.got_frompc: \n\
109 # \n\
110 # Our raddr is the caller's pc. \n\
111 # \n\
112 movl (%esp),%eax \n\
113 \n\
114 pushfl \n\
115 pushl %eax \n\
116 pushl %edx \n\
117 cli \n\
118 call " __XSTRING(CNAME(mcount)) " \n\
119 addl $8,%esp \n\
120 popfl \n\
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121 popl %edx \n\
122 popl %ecx \n\
123 popl %eax \n\
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124.mcount_exit: \n\
125 ret \n\
126");
127#else /* !__GNUC__ */
128#error
129#endif /* __GNUC__ */
130
131#ifdef GUPROF
132/*
133 * [.]mexitcount saves the return register(s), loads selfpc and calls
134 * mexitcount(selfpc) to do the work. Someday it should be in a machine
135 * dependent file together with cputime(), __mcount and [.]mcount. cputime()
136 * can't just be put in machdep.c because it has to be compiled without -pg.
137 */
138#ifdef __GNUC__
139__asm(" \n\
140 .text \n\
141# \n\
142# Dummy label to be seen when gprof -u hides [.]mexitcount. \n\
143# \n\
144 .p2align 4,0x90 \n\
145 .globl __mexitcount \n\
146 .type __mexitcount,@function \n\
147__mexitcount: \n\
148 nop \n\
149 \n\
150GMON_PROF_HIRES = 4 \n\
151 \n\
152 .p2align 4,0x90 \n\
153 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
154" __XSTRING(HIDENAME(mexitcount)) ": \n\
155 cmpl $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
156 jne .mexitcount_exit \n\
157 pushl %edx \n\
e32aee1c 158 pushl %ecx \n\
984263bc 159 pushl %eax \n\
e32aee1c 160 movl 12(%esp),%eax \n\
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161 pushfl \n\
162 pushl %eax \n\
163 cli \n\
164 call " __XSTRING(CNAME(mexitcount)) " \n\
165 addl $4,%esp \n\
166 popfl \n\
167 popl %eax \n\
e32aee1c 168 popl %ecx \n\
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169 popl %edx \n\
170.mexitcount_exit: \n\
171 ret \n\
172");
173#else /* !__GNUC__ */
174#error
175#endif /* __GNUC__ */
176
177/*
178 * Return the time elapsed since the last call. The units are machine-
179 * dependent.
180 */
181int
f123d5a1 182cputime(void)
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183{
184 u_int count;
185 int delta;
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186 u_char high, low;
187 static u_int prev_count;
188
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189 /*
190 * Read the current value of the 8254 timer counter 0.
191 */
192 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
193 low = inb(TIMER_CNTR0);
194 high = inb(TIMER_CNTR0);
195 count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
196
197 /*
198 * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
199 * While profiling is enabled, this routine is called at least twice
200 * per timer reset (for mcounting and mexitcounting hardclock()),
201 * so at most one reset has occurred since the last call, and one
202 * has occurred iff the current count is larger than the previous
203 * count. This allows counter underflow to be detected faster
204 * than in microtime().
205 */
206 delta = prev_count - count;
207 prev_count = count;
06bb314f 208 if (delta <= 0)
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209 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
210 return (delta);
211}
212
213static int
214sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
215{
216 int clock;
217 int error;
218#if defined(PERFMON) && defined(I586_PMC_GUPROF)
219 int event;
220 struct pmc pmc;
221#endif
222
223 clock = cputime_clock;
224#if defined(PERFMON) && defined(I586_PMC_GUPROF)
225 if (clock == CPUTIME_CLOCK_I586_PMC) {
226 pmc.pmc_val = cputime_clock_pmc_conf;
227 clock += pmc.pmc_event;
228 }
229#endif
230 error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
231 if (error == 0 && req->newptr != NULL) {
232#if defined(PERFMON) && defined(I586_PMC_GUPROF)
233 if (clock >= CPUTIME_CLOCK_I586_PMC) {
234 event = clock - CPUTIME_CLOCK_I586_PMC;
235 if (event >= 256)
236 return (EINVAL);
237 pmc.pmc_num = 0;
238 pmc.pmc_event = event;
239 pmc.pmc_unit = 0;
240 pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
241 pmc.pmc_mask = 0;
242 cputime_clock_pmc_conf = pmc.pmc_val;
243 cputime_clock = CPUTIME_CLOCK_I586_PMC;
244 } else
245#endif
246 {
247 if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
248 return (EINVAL);
249 cputime_clock = clock;
250 }
251 }
252 return (error);
253}
254
255SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
256 0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
257
258/*
259 * The start and stop routines need not be here since we turn off profiling
260 * before calling them. They are here for convenience.
261 */
262
263void
f123d5a1 264startguprof(struct gmonparam *gp)
984263bc 265{
1918fc5c 266 if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED)
984263bc 267 cputime_clock = CPUTIME_CLOCK_I8254;
984263bc 268 gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
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269 cputime_bias = 0;
270 cputime();
271}
272
273void
f123d5a1 274stopguprof(struct gmonparam *gp)
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275{
276#if defined(PERFMON) && defined(I586_PMC_GUPROF)
277 if (cputime_clock_pmc_init) {
278 *gp = saved_gmp;
279 perfmon_fini(0);
280 cputime_clock_pmc_init = FALSE;
281 }
282#endif
283}
284
285#else /* !GUPROF */
286#ifdef __GNUC__
287__asm(" \n\
288 .text \n\
289 .p2align 4,0x90 \n\
290 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
291" __XSTRING(HIDENAME(mexitcount)) ": \n\
292 ret \n\
293");
294#else /* !__GNUC__ */
295#error
296#endif /* __GNUC__ */
297#endif /* GUPROF */