431 lines
9.7 KiB
C
431 lines
9.7 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 1.6 1994/02/06 22:48:13 davidg Exp $
|
|
*/
|
|
|
|
/*
|
|
* Primitive clock interrupt routines.
|
|
*/
|
|
#include "param.h"
|
|
#include "systm.h"
|
|
#include "time.h"
|
|
#include "kernel.h"
|
|
#include "machine/segments.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"
|
|
|
|
/* 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))
|
|
|
|
void hardclock();
|
|
static int beeping;
|
|
int timer0_divisor = TIMER_DIV(100); /* XXX should be hz */
|
|
u_int timer0_prescale;
|
|
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;
|
|
|
|
|
|
void
|
|
timerintr(struct intrframe 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;
|
|
}
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 counter_limit, 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()
|
|
{
|
|
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, 0, period);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
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, 0x26);
|
|
outb (IO_RTC, RTC_STATUSB);
|
|
outb (IO_RTC+1, 2);
|
|
|
|
outb (IO_RTC, RTC_DIAG);
|
|
if (s = inb (IO_RTC+1))
|
|
printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
|
|
}
|
|
|
|
|
|
/* convert 2 digit BCD number */
|
|
int
|
|
bcd(int i)
|
|
{
|
|
return ((i/16)*10 + (i%16));
|
|
}
|
|
|
|
|
|
/* convert years to seconds (from 1970) */
|
|
unsigned long
|
|
ytos(int y)
|
|
{
|
|
int i;
|
|
unsigned long ret;
|
|
|
|
ret = 0;
|
|
for(i = 1970; i < y; i++) {
|
|
if (i % 4) ret += 365*24*60*60;
|
|
else ret += 366*24*60*60;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* convert months to seconds */
|
|
unsigned long
|
|
mtos(int m, int leap)
|
|
{
|
|
int i;
|
|
unsigned long ret;
|
|
|
|
ret = 0;
|
|
for(i=1; i<m; i++) {
|
|
switch(i){
|
|
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
|
|
ret += 31*24*60*60; break;
|
|
case 4: case 6: case 9: case 11:
|
|
ret += 30*24*60*60; break;
|
|
case 2:
|
|
if (leap) ret += 29*24*60*60;
|
|
else ret += 28*24*60*60;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
int leap, day_week, t, yd;
|
|
int sa,s;
|
|
|
|
/* do we have a realtime clock present? (otherwise we loop below) */
|
|
sa = rtcin(RTC_STATUSA);
|
|
if (sa == 0xff || sa == 0) return;
|
|
|
|
/* ready for a read? */
|
|
while ((sa&RTCSA_TUP) == RTCSA_TUP)
|
|
sa = rtcin(RTC_STATUSA);
|
|
|
|
sec = bcd(rtcin(RTC_YEAR)) + 1900;
|
|
if (sec < 1970)
|
|
sec += 100;
|
|
|
|
leap = !(sec % 4); sec = ytos(sec); /* year */
|
|
yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec+=yd; /* month */
|
|
t = (bcd(rtcin(RTC_DAY))-1) * 24*60*60; sec+=t; yd+=t; /* date */
|
|
day_week = rtcin(RTC_WDAY); /* day */
|
|
sec += bcd(rtcin(RTC_HRS)) * 60*60; /* hour */
|
|
sec += bcd(rtcin(RTC_MIN)) * 60; /* minutes */
|
|
sec += bcd(rtcin(RTC_SEC)); /* seconds */
|
|
sec += tz.tz_minuteswest * 60;
|
|
time.tv_sec = sec;
|
|
}
|
|
|
|
|
|
#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
|
|
|
|
|
|
/*
|
|
* Restart the clock.
|
|
*/
|
|
void
|
|
resettodr()
|
|
{
|
|
}
|
|
|
|
|
|
/*
|
|
* Wire clock interrupt in.
|
|
*/
|
|
#define V(s) __CONCAT(V, s)
|
|
extern void V(clk)();
|
|
|
|
|
|
void
|
|
enablertclock()
|
|
{
|
|
setidt(ICU_OFFSET+0, &V(clk), SDT_SYS386IGT, SEL_KPL);
|
|
INTREN(IRQ0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Delay for some number of milliseconds.
|
|
*/
|
|
void
|
|
spinwait(int millisecs)
|
|
{
|
|
DELAY(1000 * millisecs);
|
|
}
|