041b706b2f
sysctl_handle_int is not sizeof the int type you want to export. The type must always be an int or an unsigned int. Remove the instances where a sizeof(variable) is passed to stop people accidently cut and pasting these examples. In a few places this was sysctl_handle_int was being used on 64 bit types, which would truncate the value to be exported. In these cases use sysctl_handle_quad to export them and change the format to Q so that sysctl(1) can still print them.
823 lines
19 KiB
C
823 lines
19 KiB
C
/*-
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
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* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* William Jolitz and Don Ahn.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* Routines to handle clock hardware.
|
|
*/
|
|
|
|
/*
|
|
* inittodr, settodr and support routines written
|
|
* by Christoph Robitschko <chmr@edvz.tu-graz.ac.at>
|
|
*
|
|
* reintroduced and updated by Chris Stenton <chris@gnome.co.uk> 8/10/94
|
|
*/
|
|
|
|
/*
|
|
* modified for PC98 by Kakefuda
|
|
*/
|
|
|
|
#include "opt_apic.h"
|
|
#include "opt_clock.h"
|
|
#include "opt_isa.h"
|
|
#include "opt_mca.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/clock.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/kdb.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/time.h>
|
|
#include <sys/timetc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/module.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/cons.h>
|
|
#include <sys/power.h>
|
|
|
|
#include <machine/clock.h>
|
|
#include <machine/cpu.h>
|
|
#include <machine/cputypes.h>
|
|
#include <machine/frame.h>
|
|
#include <machine/intr_machdep.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/psl.h>
|
|
#ifdef DEV_APIC
|
|
#include <machine/apicvar.h>
|
|
#endif
|
|
#include <machine/specialreg.h>
|
|
#include <machine/ppireg.h>
|
|
#include <machine/timerreg.h>
|
|
|
|
#include <i386/isa/icu.h>
|
|
#include <pc98/cbus/cbus.h>
|
|
#include <pc98/pc98/pc98_machdep.h>
|
|
#ifdef DEV_ISA
|
|
#include <isa/isavar.h>
|
|
#endif
|
|
|
|
#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x))
|
|
|
|
int clkintr_pending;
|
|
int pscnt = 1;
|
|
int psdiv = 1;
|
|
int statclock_disable;
|
|
#ifndef TIMER_FREQ
|
|
#define TIMER_FREQ 2457600
|
|
#endif
|
|
u_int timer_freq = TIMER_FREQ;
|
|
int timer0_max_count;
|
|
int timer0_real_max_count;
|
|
|
|
static int beeping = 0;
|
|
static struct mtx clock_lock;
|
|
static struct intsrc *i8254_intsrc;
|
|
static u_int32_t i8254_lastcount;
|
|
static u_int32_t i8254_offset;
|
|
static int (*i8254_pending)(struct intsrc *);
|
|
static int i8254_ticked;
|
|
static int using_lapic_timer;
|
|
|
|
/* Values for timerX_state: */
|
|
#define RELEASED 0
|
|
#define RELEASE_PENDING 1
|
|
#define ACQUIRED 2
|
|
#define ACQUIRE_PENDING 3
|
|
|
|
static u_char timer1_state;
|
|
static u_char timer2_state;
|
|
static void rtc_serialcombit(int);
|
|
static void rtc_serialcom(int);
|
|
static int rtc_inb(void);
|
|
static void rtc_outb(int);
|
|
|
|
static unsigned i8254_get_timecount(struct timecounter *tc);
|
|
static unsigned i8254_simple_get_timecount(struct timecounter *tc);
|
|
static void set_timer_freq(u_int freq, int intr_freq);
|
|
|
|
static struct timecounter i8254_timecounter = {
|
|
i8254_get_timecount, /* get_timecount */
|
|
0, /* no poll_pps */
|
|
~0u, /* counter_mask */
|
|
0, /* frequency */
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|
"i8254", /* name */
|
|
0 /* quality */
|
|
};
|
|
|
|
static int
|
|
clkintr(struct trapframe *frame)
|
|
{
|
|
|
|
if (timecounter->tc_get_timecount == i8254_get_timecount) {
|
|
mtx_lock_spin(&clock_lock);
|
|
if (i8254_ticked)
|
|
i8254_ticked = 0;
|
|
else {
|
|
i8254_offset += timer0_max_count;
|
|
i8254_lastcount = 0;
|
|
}
|
|
clkintr_pending = 0;
|
|
mtx_unlock_spin(&clock_lock);
|
|
}
|
|
KASSERT(!using_lapic_timer, ("clk interrupt enabled with lapic timer"));
|
|
hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
|
|
return (FILTER_HANDLED);
|
|
}
|
|
|
|
int
|
|
acquire_timer1(int mode)
|
|
{
|
|
|
|
if (timer1_state != RELEASED)
|
|
return (-1);
|
|
timer1_state = ACQUIRED;
|
|
|
|
/*
|
|
* This access to the timer registers is as atomic as possible
|
|
* because it is a single instruction. We could do better if we
|
|
* knew the rate. Use of splclock() limits glitches to 10-100us,
|
|
* and this is probably good enough for timer2, so we aren't as
|
|
* careful with it as with timer0.
|
|
*/
|
|
outb(TIMER_MODE, TIMER_SEL1 | (mode & 0x3f));
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|
|
|
return (0);
|
|
}
|
|
|
|
int
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|
acquire_timer2(int mode)
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|
{
|
|
|
|
if (timer2_state != RELEASED)
|
|
return (-1);
|
|
timer2_state = ACQUIRED;
|
|
|
|
/*
|
|
* This access to the timer registers is as atomic as possible
|
|
* because it is a single instruction. We could do better if we
|
|
* knew the rate. Use of splclock() limits glitches to 10-100us,
|
|
* and this is probably good enough for timer2, so we aren't as
|
|
* careful with it as with timer0.
|
|
*/
|
|
outb(TIMER_MODE, TIMER_SEL2 | (mode & 0x3f));
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
release_timer1()
|
|
{
|
|
|
|
if (timer1_state != ACQUIRED)
|
|
return (-1);
|
|
timer1_state = RELEASED;
|
|
outb(TIMER_MODE, TIMER_SEL1 | TIMER_SQWAVE | TIMER_16BIT);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
release_timer2()
|
|
{
|
|
|
|
if (timer2_state != ACQUIRED)
|
|
return (-1);
|
|
timer2_state = RELEASED;
|
|
outb(TIMER_MODE, TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT);
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
getit(void)
|
|
{
|
|
int high, low;
|
|
|
|
mtx_lock_spin(&clock_lock);
|
|
|
|
/* Select timer0 and latch counter value. */
|
|
outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
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|
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|
low = inb(TIMER_CNTR0);
|
|
high = inb(TIMER_CNTR0);
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|
|
|
mtx_unlock_spin(&clock_lock);
|
|
return ((high << 8) | low);
|
|
}
|
|
|
|
/*
|
|
* Wait "n" microseconds.
|
|
* Relies on timer 1 counting down from (timer_freq / hz)
|
|
* Note: timer had better have been programmed before this is first used!
|
|
*/
|
|
void
|
|
DELAY(int n)
|
|
{
|
|
int delta, prev_tick, tick, ticks_left;
|
|
|
|
#ifdef DELAYDEBUG
|
|
int getit_calls = 1;
|
|
int n1;
|
|
static int state = 0;
|
|
|
|
if (state == 0) {
|
|
state = 1;
|
|
for (n1 = 1; n1 <= 10000000; n1 *= 10)
|
|
DELAY(n1);
|
|
state = 2;
|
|
}
|
|
if (state == 1)
|
|
printf("DELAY(%d)...", n);
|
|
#endif
|
|
/*
|
|
* Read the counter first, so that the rest of the setup overhead is
|
|
* counted. Guess the initial overhead is 20 usec (on most systems it
|
|
* takes about 1.5 usec for each of the i/o's in getit(). The loop
|
|
* takes about 6 usec on a 486/33 and 13 usec on a 386/20. The
|
|
* multiplications and divisions to scale the count take a while).
|
|
*
|
|
* However, if ddb is active then use a fake counter since reading
|
|
* the i8254 counter involves acquiring a lock. ddb must not do
|
|
* locking for many reasons, but it calls here for at least atkbd
|
|
* input.
|
|
*/
|
|
#ifdef KDB
|
|
if (kdb_active)
|
|
prev_tick = 1;
|
|
else
|
|
#endif
|
|
prev_tick = getit();
|
|
n -= 0; /* XXX actually guess no initial overhead */
|
|
/*
|
|
* Calculate (n * (timer_freq / 1e6)) without using floating point
|
|
* and without any avoidable overflows.
|
|
*/
|
|
if (n <= 0)
|
|
ticks_left = 0;
|
|
else if (n < 256)
|
|
/*
|
|
* Use fixed point to avoid a slow division by 1000000.
|
|
* 39099 = 1193182 * 2^15 / 10^6 rounded to nearest.
|
|
* 2^15 is the first power of 2 that gives exact results
|
|
* for n between 0 and 256.
|
|
*/
|
|
ticks_left = ((u_int)n * 39099 + (1 << 15) - 1) >> 15;
|
|
else
|
|
/*
|
|
* Don't bother using fixed point, although gcc-2.7.2
|
|
* generates particularly poor code for the long long
|
|
* division, since even the slow way will complete long
|
|
* before the delay is up (unless we're interrupted).
|
|
*/
|
|
ticks_left = ((u_int)n * (long long)timer_freq + 999999)
|
|
/ 1000000;
|
|
|
|
while (ticks_left > 0) {
|
|
#ifdef KDB
|
|
if (kdb_active) {
|
|
outb(0x5f, 0);
|
|
tick = prev_tick - 1;
|
|
if (tick <= 0)
|
|
tick = timer0_max_count;
|
|
} else
|
|
#endif
|
|
tick = getit();
|
|
#ifdef DELAYDEBUG
|
|
++getit_calls;
|
|
#endif
|
|
delta = prev_tick - tick;
|
|
prev_tick = tick;
|
|
if (delta < 0) {
|
|
delta += timer0_max_count;
|
|
/*
|
|
* Guard against timer0_max_count being wrong.
|
|
* This shouldn't happen in normal operation,
|
|
* but it may happen if set_timer_freq() is
|
|
* traced.
|
|
*/
|
|
if (delta < 0)
|
|
delta = 0;
|
|
}
|
|
ticks_left -= delta;
|
|
}
|
|
#ifdef DELAYDEBUG
|
|
if (state == 1)
|
|
printf(" %d calls to getit() at %d usec each\n",
|
|
getit_calls, (n + 5) / getit_calls);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
sysbeepstop(void *chan)
|
|
{
|
|
ppi_spkr_off(); /* disable counter1 output to speaker */
|
|
timer_spkr_release();
|
|
beeping = 0;
|
|
}
|
|
|
|
int
|
|
sysbeep(int pitch, int period)
|
|
{
|
|
int x = splclock();
|
|
|
|
if (timer_spkr_acquire())
|
|
if (!beeping) {
|
|
/* Something else owns it. */
|
|
splx(x);
|
|
return (-1); /* XXX Should be EBUSY, but nobody cares anyway. */
|
|
}
|
|
mtx_lock_spin(&clock_lock);
|
|
spkr_set_pitch(pitch);
|
|
mtx_unlock_spin(&clock_lock);
|
|
if (!beeping) {
|
|
/* enable counter1 output to speaker */
|
|
ppi_spkr_on();
|
|
beeping = period;
|
|
timeout(sysbeepstop, (void *)NULL, period);
|
|
}
|
|
splx(x);
|
|
return (0);
|
|
}
|
|
|
|
static u_int
|
|
calibrate_clocks(void)
|
|
{
|
|
int timeout;
|
|
u_int count, prev_count, tot_count;
|
|
u_short sec, start_sec;
|
|
|
|
if (bootverbose)
|
|
printf("Calibrating clock(s) ... ");
|
|
/* Check ARTIC. */
|
|
if (!(PC98_SYSTEM_PARAMETER(0x458) & 0x80) &&
|
|
!(PC98_SYSTEM_PARAMETER(0x45b) & 0x04))
|
|
goto fail;
|
|
timeout = 100000000;
|
|
|
|
/* Read the ARTIC. */
|
|
sec = inw(0x5e);
|
|
|
|
/* Wait for the ARTIC to changes. */
|
|
start_sec = sec;
|
|
for (;;) {
|
|
sec = inw(0x5e);
|
|
if (sec != start_sec)
|
|
break;
|
|
if (--timeout == 0)
|
|
goto fail;
|
|
}
|
|
|
|
/* Start keeping track of the i8254 counter. */
|
|
prev_count = getit();
|
|
if (prev_count == 0 || prev_count > timer0_max_count)
|
|
goto fail;
|
|
tot_count = 0;
|
|
|
|
start_sec = sec;
|
|
for (;;) {
|
|
sec = inw(0x5e);
|
|
count = getit();
|
|
if (count == 0 || count > timer0_max_count)
|
|
goto fail;
|
|
if (count > prev_count)
|
|
tot_count += prev_count - (count - timer0_max_count);
|
|
else
|
|
tot_count += prev_count - count;
|
|
prev_count = count;
|
|
if ((sec == start_sec + 1200) || /* 1200 = 307.2KHz >> 8 */
|
|
(sec < start_sec &&
|
|
(u_int)sec + 0x10000 == (u_int)start_sec + 1200))
|
|
break;
|
|
if (--timeout == 0)
|
|
goto fail;
|
|
}
|
|
|
|
if (bootverbose) {
|
|
printf("i8254 clock: %u Hz\n", tot_count);
|
|
}
|
|
return (tot_count);
|
|
|
|
fail:
|
|
if (bootverbose)
|
|
printf("failed, using default i8254 clock of %u Hz\n",
|
|
timer_freq);
|
|
return (timer_freq);
|
|
}
|
|
|
|
static void
|
|
set_timer_freq(u_int freq, int intr_freq)
|
|
{
|
|
int new_timer0_real_max_count;
|
|
|
|
i8254_timecounter.tc_frequency = freq;
|
|
mtx_lock_spin(&clock_lock);
|
|
timer_freq = freq;
|
|
if (using_lapic_timer)
|
|
new_timer0_real_max_count = 0x10000;
|
|
else
|
|
new_timer0_real_max_count = TIMER_DIV(intr_freq);
|
|
if (new_timer0_real_max_count != timer0_real_max_count) {
|
|
timer0_real_max_count = new_timer0_real_max_count;
|
|
if (timer0_real_max_count == 0x10000)
|
|
timer0_max_count = 0xffff;
|
|
else
|
|
timer0_max_count = timer0_real_max_count;
|
|
outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
|
|
outb(TIMER_CNTR0, timer0_real_max_count & 0xff);
|
|
outb(TIMER_CNTR0, timer0_real_max_count >> 8);
|
|
}
|
|
mtx_unlock_spin(&clock_lock);
|
|
}
|
|
|
|
static void
|
|
i8254_restore(void)
|
|
{
|
|
|
|
mtx_lock_spin(&clock_lock);
|
|
outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
|
|
outb(TIMER_CNTR0, timer0_real_max_count & 0xff);
|
|
outb(TIMER_CNTR0, timer0_real_max_count >> 8);
|
|
mtx_unlock_spin(&clock_lock);
|
|
}
|
|
|
|
|
|
/*
|
|
* Restore all the timers non-atomically (XXX: should be atomically).
|
|
*
|
|
* This function is called from pmtimer_resume() to restore all the timers.
|
|
* This should not be necessary, but there are broken laptops that do not
|
|
* restore all the timers on resume.
|
|
*/
|
|
void
|
|
timer_restore(void)
|
|
{
|
|
|
|
i8254_restore(); /* restore timer_freq and hz */
|
|
}
|
|
|
|
/* This is separate from startrtclock() so that it can be called early. */
|
|
void
|
|
i8254_init(void)
|
|
{
|
|
|
|
mtx_init(&clock_lock, "clk", NULL, MTX_SPIN | MTX_NOPROFILE);
|
|
|
|
if (pc98_machine_type & M_8M)
|
|
timer_freq = 1996800L; /* 1.9968 MHz */
|
|
else
|
|
timer_freq = 2457600L; /* 2.4576 MHz */
|
|
|
|
set_timer_freq(timer_freq, hz);
|
|
}
|
|
|
|
void
|
|
startrtclock()
|
|
{
|
|
u_int delta, freq;
|
|
|
|
freq = calibrate_clocks();
|
|
#ifdef CLK_CALIBRATION_LOOP
|
|
if (bootverbose) {
|
|
printf(
|
|
"Press a key on the console to abort clock calibration\n");
|
|
while (cncheckc() == -1)
|
|
calibrate_clocks();
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Use the calibrated i8254 frequency if it seems reasonable.
|
|
* Otherwise use the default, and don't use the calibrated i586
|
|
* frequency.
|
|
*/
|
|
delta = freq > timer_freq ? freq - timer_freq : timer_freq - freq;
|
|
if (delta < timer_freq / 100) {
|
|
#ifndef CLK_USE_I8254_CALIBRATION
|
|
if (bootverbose)
|
|
printf(
|
|
"CLK_USE_I8254_CALIBRATION not specified - using default frequency\n");
|
|
freq = timer_freq;
|
|
#endif
|
|
timer_freq = freq;
|
|
} else {
|
|
if (bootverbose)
|
|
printf(
|
|
"%d Hz differs from default of %d Hz by more than 1%%\n",
|
|
freq, timer_freq);
|
|
}
|
|
|
|
set_timer_freq(timer_freq, hz);
|
|
tc_init(&i8254_timecounter);
|
|
|
|
init_TSC();
|
|
}
|
|
|
|
static void
|
|
rtc_serialcombit(int i)
|
|
{
|
|
outb(IO_RTC, ((i&0x01)<<5)|0x07);
|
|
DELAY(1);
|
|
outb(IO_RTC, ((i&0x01)<<5)|0x17);
|
|
DELAY(1);
|
|
outb(IO_RTC, ((i&0x01)<<5)|0x07);
|
|
DELAY(1);
|
|
}
|
|
|
|
static void
|
|
rtc_serialcom(int i)
|
|
{
|
|
rtc_serialcombit(i&0x01);
|
|
rtc_serialcombit((i&0x02)>>1);
|
|
rtc_serialcombit((i&0x04)>>2);
|
|
rtc_serialcombit((i&0x08)>>3);
|
|
outb(IO_RTC, 0x07);
|
|
DELAY(1);
|
|
outb(IO_RTC, 0x0f);
|
|
DELAY(1);
|
|
outb(IO_RTC, 0x07);
|
|
DELAY(1);
|
|
}
|
|
|
|
static void
|
|
rtc_outb(int val)
|
|
{
|
|
int s;
|
|
int sa = 0;
|
|
|
|
for (s=0;s<8;s++) {
|
|
sa = ((val >> s) & 0x01) ? 0x27 : 0x07;
|
|
outb(IO_RTC, sa); /* set DI & CLK 0 */
|
|
DELAY(1);
|
|
outb(IO_RTC, sa | 0x10); /* CLK 1 */
|
|
DELAY(1);
|
|
}
|
|
outb(IO_RTC, sa & 0xef); /* CLK 0 */
|
|
}
|
|
|
|
static int
|
|
rtc_inb(void)
|
|
{
|
|
int s;
|
|
int sa = 0;
|
|
|
|
for (s=0;s<8;s++) {
|
|
sa |= ((inb(0x33) & 0x01) << s);
|
|
outb(IO_RTC, 0x17); /* CLK 1 */
|
|
DELAY(1);
|
|
outb(IO_RTC, 0x07); /* CLK 0 */
|
|
DELAY(2);
|
|
}
|
|
return sa;
|
|
}
|
|
|
|
/*
|
|
* Initialize the time of day register, based on the time base which is, e.g.
|
|
* from a filesystem.
|
|
*/
|
|
void
|
|
inittodr(time_t base)
|
|
{
|
|
struct timespec ts;
|
|
struct clocktime ct;
|
|
int i;
|
|
|
|
if (base) {
|
|
ts.tv_sec = base;
|
|
ts.tv_nsec = 0;
|
|
tc_setclock(&ts);
|
|
}
|
|
|
|
rtc_serialcom(0x03); /* Time Read */
|
|
rtc_serialcom(0x01); /* Register shift command. */
|
|
DELAY(20);
|
|
|
|
ct.nsec = 0;
|
|
ct.sec = bcd2bin(rtc_inb() & 0xff); /* sec */
|
|
ct.min = bcd2bin(rtc_inb() & 0xff); /* min */
|
|
ct.hour = bcd2bin(rtc_inb() & 0xff); /* hour */
|
|
ct.day = bcd2bin(rtc_inb() & 0xff); /* date */
|
|
i = rtc_inb();
|
|
ct.dow = i & 0x0f; /* dow */
|
|
ct.mon = (i >> 4) & 0x0f; /* month */
|
|
ct.year = bcd2bin(rtc_inb() & 0xff) + 1900; /* year */
|
|
if (ct.year < 1995)
|
|
ct.year += 100;
|
|
clock_ct_to_ts(&ct, &ts);
|
|
ts.tv_sec += utc_offset();
|
|
tc_setclock(&ts);
|
|
}
|
|
|
|
/*
|
|
* Write system time back to RTC
|
|
*/
|
|
void
|
|
resettodr()
|
|
{
|
|
struct timespec ts;
|
|
struct clocktime ct;
|
|
|
|
if (disable_rtc_set)
|
|
return;
|
|
|
|
getnanotime(&ts);
|
|
ts.tv_sec -= utc_offset();
|
|
clock_ts_to_ct(&ts, &ct);
|
|
|
|
rtc_serialcom(0x01); /* Register shift command. */
|
|
|
|
rtc_outb(bin2bcd(ct.sec)); /* Write back Seconds */
|
|
rtc_outb(bin2bcd(ct.min)); /* Write back Minutes */
|
|
rtc_outb(bin2bcd(ct.hour)); /* Write back Hours */
|
|
|
|
rtc_outb(bin2bcd(ct.day)); /* Write back Day */
|
|
rtc_outb((ct.mon << 4) | ct.dow); /* Write back Month and DOW */
|
|
rtc_outb(bin2bcd(ct.year % 100)); /* Write back Year */
|
|
|
|
rtc_serialcom(0x02); /* Time set & Counter hold command. */
|
|
rtc_serialcom(0x00); /* Register hold command. */
|
|
}
|
|
|
|
|
|
/*
|
|
* Start both clocks running.
|
|
*/
|
|
void
|
|
cpu_initclocks()
|
|
{
|
|
|
|
#ifdef DEV_APIC
|
|
using_lapic_timer = lapic_setup_clock();
|
|
#endif
|
|
/*
|
|
* If we aren't using the local APIC timer to drive the kernel
|
|
* clocks, setup the interrupt handler for the 8254 timer 0 so
|
|
* that it can drive hardclock(). Otherwise, change the 8254
|
|
* timecounter to user a simpler algorithm.
|
|
*/
|
|
if (!using_lapic_timer) {
|
|
intr_add_handler("clk", 0, (driver_filter_t *)clkintr, NULL,
|
|
NULL, INTR_TYPE_CLK, NULL);
|
|
i8254_intsrc = intr_lookup_source(0);
|
|
if (i8254_intsrc != NULL)
|
|
i8254_pending =
|
|
i8254_intsrc->is_pic->pic_source_pending;
|
|
} else {
|
|
i8254_timecounter.tc_get_timecount =
|
|
i8254_simple_get_timecount;
|
|
i8254_timecounter.tc_counter_mask = 0xffff;
|
|
set_timer_freq(timer_freq, hz);
|
|
}
|
|
|
|
init_TSC_tc();
|
|
}
|
|
|
|
void
|
|
cpu_startprofclock(void)
|
|
{
|
|
}
|
|
|
|
void
|
|
cpu_stopprofclock(void)
|
|
{
|
|
}
|
|
|
|
static int
|
|
sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
u_int freq;
|
|
|
|
/*
|
|
* Use `i8254' instead of `timer' in external names because `timer'
|
|
* is is too generic. Should use it everywhere.
|
|
*/
|
|
freq = timer_freq;
|
|
error = sysctl_handle_int(oidp, &freq, 0, req);
|
|
if (error == 0 && req->newptr != NULL)
|
|
set_timer_freq(freq, hz);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_machdep, OID_AUTO, i8254_freq, CTLTYPE_INT | CTLFLAG_RW,
|
|
0, sizeof(u_int), sysctl_machdep_i8254_freq, "IU", "");
|
|
|
|
static unsigned
|
|
i8254_simple_get_timecount(struct timecounter *tc)
|
|
{
|
|
|
|
return (timer0_max_count - getit());
|
|
}
|
|
|
|
static unsigned
|
|
i8254_get_timecount(struct timecounter *tc)
|
|
{
|
|
u_int count;
|
|
u_int high, low;
|
|
u_int eflags;
|
|
|
|
eflags = read_eflags();
|
|
mtx_lock_spin(&clock_lock);
|
|
|
|
/* Select timer0 and latch counter value. */
|
|
outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
|
|
|
|
low = inb(TIMER_CNTR0);
|
|
high = inb(TIMER_CNTR0);
|
|
count = timer0_max_count - ((high << 8) | low);
|
|
if (count < i8254_lastcount ||
|
|
(!i8254_ticked && (clkintr_pending ||
|
|
((count < 20 || (!(eflags & PSL_I) && count < timer0_max_count / 2u)) &&
|
|
i8254_pending != NULL && i8254_pending(i8254_intsrc))))) {
|
|
i8254_ticked = 1;
|
|
i8254_offset += timer0_max_count;
|
|
}
|
|
i8254_lastcount = count;
|
|
count += i8254_offset;
|
|
mtx_unlock_spin(&clock_lock);
|
|
return (count);
|
|
}
|
|
|
|
#ifdef DEV_ISA
|
|
/*
|
|
* Attach to the ISA PnP descriptors for the timer and realtime clock.
|
|
*/
|
|
static struct isa_pnp_id attimer_ids[] = {
|
|
{ 0x0001d041 /* PNP0100 */, "AT timer" },
|
|
{ 0x000bd041 /* PNP0B00 */, "AT realtime clock" },
|
|
{ 0 }
|
|
};
|
|
|
|
static int
|
|
attimer_probe(device_t dev)
|
|
{
|
|
int result;
|
|
|
|
if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, attimer_ids)) <= 0)
|
|
device_quiet(dev);
|
|
return(result);
|
|
}
|
|
|
|
static int
|
|
attimer_attach(device_t dev)
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
static device_method_t attimer_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, attimer_probe),
|
|
DEVMETHOD(device_attach, attimer_attach),
|
|
DEVMETHOD(device_detach, bus_generic_detach),
|
|
DEVMETHOD(device_shutdown, bus_generic_shutdown),
|
|
DEVMETHOD(device_suspend, bus_generic_suspend), /* XXX stop statclock? */
|
|
DEVMETHOD(device_resume, bus_generic_resume), /* XXX restart statclock? */
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t attimer_driver = {
|
|
"attimer",
|
|
attimer_methods,
|
|
1, /* no softc */
|
|
};
|
|
|
|
static devclass_t attimer_devclass;
|
|
|
|
DRIVER_MODULE(attimer, isa, attimer_driver, attimer_devclass, 0, 0);
|
|
#endif /* DEV_ISA */
|