336abda6cd
Enabled timer reprogramming in clock.c (this could use more work). Obtained from: FreeBSD-1.1.5.1
563 lines
14 KiB
C
563 lines
14 KiB
C
/*-
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
|
|
* $Id: clock.c,v 1.21 1994/09/20 21:20:46 bde Exp $
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* Primitive clock interrupt routines.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
#include <machine/frame.h>
|
|
#include <i386/isa/icu.h>
|
|
#include <i386/isa/isa.h>
|
|
#include <i386/isa/rtc.h>
|
|
#include <i386/isa/timerreg.h>
|
|
|
|
/*
|
|
* 32-bit time_t's can't reach leap years before 1904 or after 2036, so we
|
|
* can use a simple formula for leap years.
|
|
*/
|
|
#define LEAPYEAR(y) ((u_int)(y) % 4 == 0)
|
|
#define DAYSPERYEAR (31+28+31+30+31+30+31+31+30+31+30+31)
|
|
|
|
/* X-tals being what they are, it's nice to be able to fudge this one... */
|
|
/* Note, the name changed here from XTALSPEED to TIMER_FREQ rgrimes 4/26/93 */
|
|
#ifndef TIMER_FREQ
|
|
#define TIMER_FREQ 1193182 /* XXX - should be in isa.h */
|
|
#endif
|
|
#define TIMER_DIV(x) ((TIMER_FREQ+(x)/2)/(x))
|
|
|
|
static int beeping;
|
|
int timer0_divisor = TIMER_DIV(100); /* XXX should be hz */
|
|
u_int timer0_prescale;
|
|
int adjkerntz = 0; /* offset from CMOS clock */
|
|
static char timer0_state = 0, timer2_state = 0;
|
|
static char timer0_reprogram = 0;
|
|
static void (*timer_func)() = hardclock;
|
|
static void (*new_function)();
|
|
static u_int new_rate;
|
|
static u_int hardclock_divisor;
|
|
static const u_char daysinmonth[] = {31,28,31,30,31,30,31,31,30,31,30,31};
|
|
static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
|
|
|
|
#ifdef I586_CPU
|
|
int pentium_mhz = 0;
|
|
#endif
|
|
|
|
#if 0
|
|
void
|
|
clkintr(struct clockframe frame)
|
|
{
|
|
hardclock(&frame);
|
|
}
|
|
#else
|
|
void
|
|
clkintr(struct clockframe frame)
|
|
{
|
|
timer_func(&frame);
|
|
switch (timer0_state) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
if ((timer0_prescale+=timer0_divisor) >= hardclock_divisor) {
|
|
hardclock(&frame);
|
|
timer0_prescale = 0;
|
|
}
|
|
break;
|
|
case 2:
|
|
disable_intr();
|
|
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
|
outb(TIMER_CNTR0, TIMER_DIV(new_rate)%256);
|
|
outb(TIMER_CNTR0, TIMER_DIV(new_rate)/256);
|
|
enable_intr();
|
|
timer0_divisor = TIMER_DIV(new_rate);
|
|
timer0_prescale = 0;
|
|
timer_func = new_function;
|
|
timer0_state = 1;
|
|
break;
|
|
case 3:
|
|
if ((timer0_prescale+=timer0_divisor) >= hardclock_divisor) {
|
|
hardclock(&frame);
|
|
disable_intr();
|
|
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
|
outb(TIMER_CNTR0, TIMER_DIV(hz)%256);
|
|
outb(TIMER_CNTR0, TIMER_DIV(hz)/256);
|
|
enable_intr();
|
|
timer0_divisor = TIMER_DIV(hz);
|
|
timer0_prescale = 0;
|
|
timer_func = hardclock;;
|
|
timer0_state = 0;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int
|
|
acquire_timer0(int rate, void (*function)() )
|
|
{
|
|
if (timer0_state || !function)
|
|
return -1;
|
|
new_function = function;
|
|
new_rate = rate;
|
|
timer0_state = 2;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
acquire_timer2(int mode)
|
|
{
|
|
if (timer2_state)
|
|
return -1;
|
|
timer2_state = 1;
|
|
outb(TIMER_MODE, TIMER_SEL2 | (mode &0x3f));
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
release_timer0()
|
|
{
|
|
if (!timer0_state)
|
|
return -1;
|
|
timer0_state = 3;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
release_timer2()
|
|
{
|
|
if (!timer2_state)
|
|
return -1;
|
|
timer2_state = 0;
|
|
outb(TIMER_MODE, TIMER_SEL2|TIMER_SQWAVE|TIMER_16BIT);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This routine receives statistical clock interrupts from the RTC.
|
|
* As explained above, these occur at 128 interrupts per second.
|
|
* When profiling, we receive interrupts at a rate of 1024 Hz.
|
|
*
|
|
* This does not actually add as much overhead as it sounds, because
|
|
* when the statistical clock is active, the hardclock driver no longer
|
|
* needs to keep (inaccurate) statistics on its own. This decouples
|
|
* statistics gathering from scheduling interrupts.
|
|
*
|
|
* The RTC chip requires that we read status register C (RTC_INTR)
|
|
* to acknowledge an interrupt, before it will generate the next one.
|
|
*/
|
|
void
|
|
rtcintr(struct clockframe frame)
|
|
{
|
|
u_char stat;
|
|
stat = rtcin(RTC_INTR);
|
|
if(stat & RTCIR_PERIOD) {
|
|
statclock(&frame);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void
|
|
printrtc(void)
|
|
{
|
|
outb(IO_RTC, RTC_STATUSA);
|
|
printf("RTC status A = %x", inb(IO_RTC+1));
|
|
outb(IO_RTC, RTC_STATUSB);
|
|
printf(", B = %x", inb(IO_RTC+1));
|
|
outb(IO_RTC, RTC_INTR);
|
|
printf(", C = %x\n", inb(IO_RTC+1));
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
getit()
|
|
{
|
|
int high, low;
|
|
|
|
disable_intr();
|
|
/* select timer0 and latch counter value */
|
|
outb(TIMER_MODE, TIMER_SEL0);
|
|
low = inb(TIMER_CNTR0);
|
|
high = inb(TIMER_CNTR0);
|
|
enable_intr();
|
|
return ((high << 8) | low);
|
|
}
|
|
|
|
#ifdef I586_CPU
|
|
static long long cycles_per_sec = 0;
|
|
|
|
/*
|
|
* Figure out how fast the cyclecounter runs. This must be run with
|
|
* clock interrupts disabled, but with the timer/counter programmed
|
|
* and running.
|
|
*/
|
|
void
|
|
calibrate_cyclecounter(void)
|
|
{
|
|
volatile long edx, eax, lasteax, lastedx;
|
|
|
|
__asm __volatile(".byte 0x0f, 0x31" : "=a"(lasteax), "=d"(lastedx) : );
|
|
DELAY(1000000);
|
|
__asm __volatile(".byte 0x0f, 0x31" : "=a"(eax), "=d"(edx) : );
|
|
|
|
/*
|
|
* This assumes that you will never have a clock rate higher
|
|
* than 4GHz, probably a good assumption.
|
|
*/
|
|
cycles_per_sec = (long long)edx + eax;
|
|
cycles_per_sec -= (long long)lastedx + lasteax;
|
|
pentium_mhz = ((long)cycles_per_sec + 500000) / 1000000; /* round up */
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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 prev_tick, tick, ticks_left, sec, usec;
|
|
|
|
#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).
|
|
*/
|
|
prev_tick = getit(0, 0);
|
|
n -= 20;
|
|
/*
|
|
* Calculate (n * (TIMER_FREQ / 1e6)) without using floating point
|
|
* and without any avoidable overflows.
|
|
*/
|
|
sec = n / 1000000;
|
|
usec = n - sec * 1000000;
|
|
ticks_left = sec * TIMER_FREQ
|
|
+ usec * (TIMER_FREQ / 1000000)
|
|
+ usec * ((TIMER_FREQ % 1000000) / 1000) / 1000
|
|
+ usec * (TIMER_FREQ % 1000) / 1000000;
|
|
|
|
while (ticks_left > 0) {
|
|
tick = getit(0, 0);
|
|
#ifdef DELAYDEBUG
|
|
++getit_calls;
|
|
#endif
|
|
if (tick > prev_tick)
|
|
ticks_left -= prev_tick - (tick - timer0_divisor);
|
|
else
|
|
ticks_left -= prev_tick - tick;
|
|
prev_tick = tick;
|
|
}
|
|
#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)
|
|
{
|
|
outb(IO_PPI, inb(IO_PPI)&0xFC); /* disable counter2 output to speaker */
|
|
release_timer2();
|
|
beeping = 0;
|
|
}
|
|
|
|
int
|
|
sysbeep(int pitch, int period)
|
|
{
|
|
|
|
if (acquire_timer2(TIMER_SQWAVE|TIMER_16BIT))
|
|
return -1;
|
|
disable_intr();
|
|
outb(TIMER_CNTR2, pitch);
|
|
outb(TIMER_CNTR2, (pitch>>8));
|
|
enable_intr();
|
|
if (!beeping) {
|
|
outb(IO_PPI, inb(IO_PPI) | 3); /* enable counter2 output to speaker */
|
|
beeping = period;
|
|
timeout(sysbeepstop, (void *)NULL, period);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* RTC support routines
|
|
*/
|
|
static int
|
|
bcd2int(int bcd)
|
|
{
|
|
return(bcd/16 * 10 + bcd%16);
|
|
}
|
|
|
|
static int
|
|
int2bcd(int dez)
|
|
{
|
|
return(dez/10 * 16 + dez%10);
|
|
}
|
|
|
|
static void
|
|
writertc(int port, int val)
|
|
{
|
|
outb(IO_RTC, port);
|
|
outb(IO_RTC+1, val);
|
|
}
|
|
|
|
static int
|
|
readrtc(int port)
|
|
{
|
|
return(bcd2int(rtcin(port)));
|
|
}
|
|
|
|
void
|
|
startrtclock()
|
|
{
|
|
int s;
|
|
|
|
/* initialize 8253 clock */
|
|
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
|
|
|
/* Correct rounding will buy us a better precision in timekeeping */
|
|
outb (IO_TIMER1, TIMER_DIV(hz)%256);
|
|
outb (IO_TIMER1, TIMER_DIV(hz)/256);
|
|
timer0_divisor = hardclock_divisor = TIMER_DIV(hz);
|
|
|
|
/* initialize brain-dead battery powered clock */
|
|
outb (IO_RTC, RTC_STATUSA);
|
|
outb (IO_RTC+1, rtc_statusa);
|
|
outb (IO_RTC, RTC_STATUSB);
|
|
outb (IO_RTC+1, RTCSB_24HR);
|
|
outb (IO_RTC, RTC_DIAG);
|
|
if (s = inb (IO_RTC+1))
|
|
printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
|
|
writertc(RTC_DIAG, 0);
|
|
}
|
|
|
|
/*
|
|
* Initialize the time of day register, based on the time base which is, e.g.
|
|
* from a filesystem.
|
|
*/
|
|
void
|
|
inittodr(time_t base)
|
|
{
|
|
unsigned long sec, days;
|
|
int yd;
|
|
int year, month;
|
|
int y, m, s;
|
|
|
|
s = splclock();
|
|
time.tv_sec = base;
|
|
time.tv_usec = 0;
|
|
splx(s);
|
|
|
|
/* Look if we have a RTC present and the time is valid */
|
|
if (rtcin(RTC_STATUSD) != RTCSD_PWR)
|
|
goto wrong_time;
|
|
|
|
/* wait for time update to complete */
|
|
/* If RTCSA_TUP is zero, we have at least 244us before next update */
|
|
while (rtcin(RTC_STATUSA) & RTCSA_TUP);
|
|
|
|
days = 0;
|
|
year = readrtc(RTC_YEAR) + readrtc(RTC_CENTURY) * 100;
|
|
if (year < 1970)
|
|
goto wrong_time;
|
|
month = readrtc(RTC_MONTH);
|
|
for (m = 1; m < month; m++)
|
|
days += daysinmonth[m-1];
|
|
if ((month > 2) && LEAPYEAR(year))
|
|
days ++;
|
|
days += readrtc(RTC_DAY) - 1;
|
|
yd = days;
|
|
for (y = 1970; y < year; y++)
|
|
days += DAYSPERYEAR + LEAPYEAR(y);
|
|
sec = ((( days * 24 +
|
|
readrtc(RTC_HRS)) * 60 +
|
|
readrtc(RTC_MIN)) * 60 +
|
|
readrtc(RTC_SEC));
|
|
/* sec now contains the number of seconds, since Jan 1 1970,
|
|
in the local time zone */
|
|
|
|
sec += tz.tz_minuteswest * 60;
|
|
|
|
s = splclock();
|
|
time.tv_sec = sec;
|
|
splx(s);
|
|
return;
|
|
|
|
wrong_time:
|
|
printf("Invalid time in real time clock.\n");
|
|
printf("Check and reset the date immediately!\n");
|
|
}
|
|
|
|
/*
|
|
* Write system time back to RTC
|
|
*/
|
|
void resettodr()
|
|
{
|
|
unsigned long tm;
|
|
int y, m, fd, r, s;
|
|
|
|
s = splclock();
|
|
tm = time.tv_sec;
|
|
splx(s);
|
|
|
|
/* First, disable clock updates */
|
|
writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
|
|
|
|
/* Calculate local time to put in CMOS */
|
|
|
|
tm -= tz.tz_minuteswest * 60 + adjkerntz;
|
|
|
|
writertc(RTC_SEC, int2bcd(tm%60)); tm /= 60; /* Write back Seconds */
|
|
writertc(RTC_MIN, int2bcd(tm%60)); tm /= 60; /* Write back Minutes */
|
|
writertc(RTC_HRS, int2bcd(tm%24)); tm /= 24; /* Write back Hours */
|
|
|
|
/* We have now the days since 01-01-1970 in tm */
|
|
writertc(RTC_WDAY, (tm+4)%7); /* Write back Weekday */
|
|
for (y=1970;; y++)
|
|
if ((tm - DAYSPERYEAR - LEAPYEAR(y)) > tm)
|
|
break;
|
|
else
|
|
tm -= DAYSPERYEAR + LEAPYEAR(y);
|
|
|
|
/* Now we have the years in y and the day-of-the-year in tm */
|
|
writertc(RTC_YEAR, int2bcd(y%100)); /* Write back Year */
|
|
writertc(RTC_CENTURY, int2bcd(y/100)); /* ... and Century */
|
|
if (LEAPYEAR(y) && (tm >= 31+29))
|
|
tm--; /* Subtract Feb-29 */
|
|
for (m=1;; m++)
|
|
if (tm - daysinmonth[m-1] > tm)
|
|
break;
|
|
else
|
|
tm -= daysinmonth[m-1];
|
|
|
|
writertc(RTC_MONTH, int2bcd(m)); /* Write back Month */
|
|
writertc(RTC_DAY, int2bcd(tm+1)); /* Write back Day */
|
|
|
|
/* enable time updates */
|
|
writertc(RTC_STATUSB, RTCSB_PINTR | RTCSB_24HR);
|
|
}
|
|
|
|
#ifdef garbage
|
|
/*
|
|
* Initialze the time of day register, based on the time base which is, e.g.
|
|
* from a filesystem.
|
|
*/
|
|
test_inittodr(time_t base)
|
|
{
|
|
|
|
outb(IO_RTC,9); /* year */
|
|
printf("%d ",bcd(inb(IO_RTC+1)));
|
|
outb(IO_RTC,8); /* month */
|
|
printf("%d ",bcd(inb(IO_RTC+1)));
|
|
outb(IO_RTC,7); /* day */
|
|
printf("%d ",bcd(inb(IO_RTC+1)));
|
|
outb(IO_RTC,4); /* hour */
|
|
printf("%d ",bcd(inb(IO_RTC+1)));
|
|
outb(IO_RTC,2); /* minutes */
|
|
printf("%d ",bcd(inb(IO_RTC+1)));
|
|
outb(IO_RTC,0); /* seconds */
|
|
printf("%d\n",bcd(inb(IO_RTC+1)));
|
|
|
|
time.tv_sec = base;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Wire clock interrupt in.
|
|
*/
|
|
void
|
|
enablertclock()
|
|
{
|
|
register_intr(/* irq */ 0, /* XXX id */ 0, /* flags */ 0, clkintr,
|
|
HWI_MASK | SWI_MASK, /* unit */ 0);
|
|
INTREN(IRQ0);
|
|
register_intr(/* irq */ 8, /* XXX id */ 1, /* flags */ 0, rtcintr,
|
|
SWI_CLOCK_MASK, /* unit */ 0);
|
|
INTREN(IRQ8);
|
|
outb(IO_RTC, RTC_STATUSB);
|
|
outb(IO_RTC+1, RTCSB_PINTR | RTCSB_24HR);
|
|
}
|
|
|
|
void
|
|
cpu_initclocks()
|
|
{
|
|
stathz = RTC_NOPROFRATE;
|
|
profhz = RTC_PROFRATE;
|
|
enablertclock();
|
|
}
|
|
|
|
void
|
|
setstatclockrate(int newhz)
|
|
{
|
|
if(newhz == RTC_PROFRATE) {
|
|
rtc_statusa = RTCSA_DIVIDER | RTCSA_PROF;
|
|
} else {
|
|
rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
|
|
}
|
|
outb(IO_RTC, RTC_STATUSA);
|
|
outb(IO_RTC+1, rtc_statusa);
|
|
}
|