New support for sharing the timers
acquire_timer / release_timer Pulled in timer related functions from isa.c
This commit is contained in:
Søren Schmidt
parent
b5194b236c
commit
5194771d25
@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.5 1993/12/19 00:50:30 wollman Exp $
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* $Id: clock.c,v 1.6 1994/02/06 22:48:13 davidg Exp $
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*/
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/*
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@ -45,6 +45,7 @@
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#include "time.h"
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#include "kernel.h"
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#include "machine/segments.h"
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#include "machine/frame.h"
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#include "i386/isa/icu.h"
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#include "i386/isa/isa.h"
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#include "i386/isa/rtc.h"
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@ -55,9 +56,193 @@
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#ifndef TIMER_FREQ
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#define TIMER_FREQ 1193182 /* XXX - should be in isa.h */
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#endif
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#define TIMER_DIV(x) ((TIMER_FREQ+(x)/2)/(x))
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void hardclock();
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static void findcpuspeed(void);
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static char timer0_in_use = 0, timer2_in_use = 0;
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static int timer0_rate = 100; /* XXX should be hz */
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static void (*timer_func)() = hardclock;
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static unsigned int prescale = 0;
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static unsigned int hardclock_prescale;
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static int beeping;
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unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
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void
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timerintr(struct intrframe frame)
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{
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timer_func(frame);
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if (timer0_in_use)
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if (prescale++ >= hardclock_prescale) {
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hardclock(frame);
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prescale = 0;
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}
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}
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int
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acquire_timer0(int rate, void (*function)() )
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{
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if (timer0_in_use) /* XXX || (rate < 20000 && rate % hz)) */
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return -1;
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timer0_in_use = 1;
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timer0_rate = rate;
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prescale = 0;
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hardclock_prescale = rate/hz;
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outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
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outb(TIMER_CNTR0, TIMER_DIV(rate)%256);
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outb(TIMER_CNTR0, TIMER_DIV(rate)/256);
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if (function)
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timer_func = function;
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return 0;
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}
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int
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acquire_timer2(int mode)
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{
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if (timer2_in_use)
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return -1;
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timer2_in_use = 1;
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outb(TIMER_MODE, TIMER_SEL2 | (mode &0x3f));
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return 0;
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}
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int
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release_timer0()
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{
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if (!timer0_in_use)
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return -1;
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timer0_in_use = 0;
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timer0_rate = hz;
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outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
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outb(TIMER_CNTR0, TIMER_DIV(hz)%256);
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outb(TIMER_CNTR0, TIMER_DIV(hz)/256);
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timer_func = hardclock;
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return 0;
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}
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int
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release_timer2()
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{
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if (!timer2_in_use)
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return -1;
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timer2_in_use = 0;
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outb(TIMER_MODE, TIMER_SEL2|TIMER_SQWAVE|TIMER_16BIT);
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return 0;
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}
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static int
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getit()
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{
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int high, low;
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disable_intr();
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/* select timer0 and latch counter value */
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outb(TIMER_MODE, TIMER_SEL0);
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low = inb(TIMER_CNTR0);
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high = inb(TIMER_CNTR0);
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enable_intr();
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return ((high << 8) | low);
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}
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/*
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* Wait "n" microseconds.
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* Relies on timer 1 counting down from (TIMER_FREQ / hz)
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* Note: timer had better have been programmed before this is first used!
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*/
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void
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DELAY(int n)
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{
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int counter_limit, prev_tick, tick, ticks_left, sec, usec;
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#ifdef DELAYDEBUG
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int getit_calls = 1;
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int n1;
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static int state = 0;
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if (state == 0) {
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state = 1;
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for (n1 = 1; n1 <= 10000000; n1 *= 10)
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DELAY(n1);
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state = 2;
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}
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if (state == 1)
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printf("DELAY(%d)...", n);
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#endif
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/*
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* Read the counter first, so that the rest of the setup overhead is
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* counted. Guess the initial overhead is 20 usec (on most systems it
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* takes about 1.5 usec for each of the i/o's in getit(). The loop
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* takes about 6 usec on a 486/33 and 13 usec on a 386/20. The
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* multiplications and divisions to scale the count take a while).
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*/
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prev_tick = getit(0, 0);
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n -= 20;
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/*
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* Calculate (n * (TIMER_FREQ / 1e6)) without using floating point
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* and without any avoidable overflows.
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*/
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sec = n / 1000000;
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usec = n - sec * 1000000;
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ticks_left = sec * TIMER_FREQ
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+ usec * (TIMER_FREQ / 1000000)
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+ usec * ((TIMER_FREQ % 1000000) / 1000) / 1000
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+ usec * (TIMER_FREQ % 1000) / 1000000;
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counter_limit = TIMER_FREQ/timer0_rate;
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while (ticks_left > 0) {
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tick = getit(0, 0);
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#ifdef DELAYDEBUG
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++getit_calls;
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#endif
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if (tick > prev_tick)
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ticks_left -= prev_tick - (tick - counter_limit);
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else
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ticks_left -= prev_tick - tick;
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prev_tick = tick;
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}
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#ifdef DELAYDEBUG
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if (state == 1)
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printf(" %d calls to getit() at %d usec each\n",
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getit_calls, (n + 5) / getit_calls);
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#endif
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}
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static void
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sysbeepstop() /* SOS XXX dummy is not needed */
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{
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outb(IO_PPI, inb(IO_PPI)&0xFC); /* disable counter2 output to speaker */
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release_timer2();
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beeping = 0;
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}
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int
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sysbeep(int pitch, int period)
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{
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if (acquire_timer2(TIMER_SQWAVE|TIMER_16BIT))
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return -1;
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outb(TIMER_CNTR2, pitch);
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outb(TIMER_CNTR2, (pitch>>8));
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if (!beeping) {
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outb(IO_PPI, inb(IO_PPI) | 3); /* enable counter2 output to speaker */
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beeping = period;
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timeout(sysbeepstop, 0, period);
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}
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return 0;
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}
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void
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startrtclock()
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{
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@ -69,8 +254,9 @@ startrtclock()
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outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
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/* Correct rounding will buy us a better precision in timekeeping */
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outb (IO_TIMER1, (TIMER_FREQ+hz/2)/hz);
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outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);
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outb (IO_TIMER1, TIMER_DIV(hz)%256);
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outb (IO_TIMER1, TIMER_DIV(hz)/256);
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timer0_rate = hz;
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/* initialize brain-dead battery powered clock */
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outb (IO_RTC, RTC_STATUSA);
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@ -83,7 +269,6 @@ startrtclock()
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printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
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}
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unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
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#define FIRST_GUESS 0x2000
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static void
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@ -93,7 +278,7 @@ findcpuspeed()
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unsigned int remainder;
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/* Put counter in count down mode */
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outb(IO_TIMER1+3, 0x34);
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outb(TIMER_MODE, TIMER_16BIT|TIMER_RATEGEN);
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outb(IO_TIMER1, 0xff);
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outb(IO_TIMER1, 0xff);
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delaycount = FIRST_GUESS;
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@ -111,16 +296,15 @@ findcpuspeed()
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/* convert 2 digit BCD number */
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int
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bcd(i)
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int i;
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bcd(int i)
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{
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return ((i/16)*10 + (i%16));
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}
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/* convert years to seconds (from 1970) */
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unsigned long
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ytos(y)
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int y;
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ytos(int y)
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{
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int i;
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unsigned long ret;
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@ -133,16 +317,16 @@ int y;
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return ret;
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}
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/* convert months to seconds */
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unsigned long
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mtos(m,leap)
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int m,leap;
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mtos(int m, int leap)
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{
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int i;
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unsigned long ret;
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ret = 0;
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for(i=1;i<m;i++) {
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for(i=1; i<m; i++) {
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switch(i){
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case 1: case 3: case 5: case 7: case 8: case 10: case 12:
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ret += 31*24*60*60; break;
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@ -162,11 +346,10 @@ int m,leap;
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* from a filesystem.
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*/
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void
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inittodr(base)
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time_t base;
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inittodr(time_t base)
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{
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unsigned long sec;
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int leap,day_week,t,yd;
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int leap, day_week, t, yd;
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int sa,s;
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/* do we have a realtime clock present? (otherwise we loop below) */
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@ -180,26 +363,25 @@ inittodr(base)
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sec = bcd(rtcin(RTC_YEAR)) + 1900;
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if (sec < 1970)
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sec += 100;
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leap = !(sec % 4); sec = ytos(sec); /* year */
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yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec += yd; /* month */
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t = (bcd(rtcin(RTC_DAY))-1) * 24*60*60; sec += t; yd += t; /* date */
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yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec+=yd; /* month */
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t = (bcd(rtcin(RTC_DAY))-1) * 24*60*60; sec+=t; yd+=t; /* date */
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day_week = rtcin(RTC_WDAY); /* day */
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sec += bcd(rtcin(RTC_HRS)) * 60*60; /* hour */
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sec += bcd(rtcin(RTC_MIN)) * 60; /* minutes */
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sec += bcd(rtcin(RTC_SEC)); /* seconds */
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sec += tz.tz_minuteswest * 60;
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time.tv_sec = sec;
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}
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#ifdef garbage
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/*
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* Initialze the time of day register, based on the time base which is, e.g.
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* from a filesystem.
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*/
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test_inittodr(base)
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time_t base;
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test_inittodr(time_t base)
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{
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outb(IO_RTC,9); /* year */
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@ -219,6 +401,7 @@ test_inittodr(base)
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}
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#endif
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/*
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* Restart the clock.
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*/
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@ -227,12 +410,14 @@ resettodr()
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{
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}
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/*
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* Wire clock interrupt in.
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*/
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#define V(s) __CONCAT(V, s)
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extern void V(clk)();
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void
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enablertclock()
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{
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@ -240,12 +425,12 @@ enablertclock()
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INTREN(IRQ0);
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}
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/*
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* Delay for some number of milliseconds.
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*/
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void
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spinwait(millisecs)
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int millisecs;
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spinwait(int millisecs)
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{
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DELAY(1000 * millisecs);
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}
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.5 1993/12/19 00:50:30 wollman Exp $
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* $Id: clock.c,v 1.6 1994/02/06 22:48:13 davidg Exp $
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*/
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/*
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@ -45,6 +45,7 @@
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#include "time.h"
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#include "kernel.h"
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#include "machine/segments.h"
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#include "machine/frame.h"
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#include "i386/isa/icu.h"
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#include "i386/isa/isa.h"
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#include "i386/isa/rtc.h"
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@ -55,9 +56,193 @@
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#ifndef TIMER_FREQ
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#define TIMER_FREQ 1193182 /* XXX - should be in isa.h */
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#endif
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#define TIMER_DIV(x) ((TIMER_FREQ+(x)/2)/(x))
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void hardclock();
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static void findcpuspeed(void);
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static char timer0_in_use = 0, timer2_in_use = 0;
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static int timer0_rate = 100; /* XXX should be hz */
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static void (*timer_func)() = hardclock;
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static unsigned int prescale = 0;
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static unsigned int hardclock_prescale;
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static int beeping;
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unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
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void
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timerintr(struct intrframe frame)
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{
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timer_func(frame);
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if (timer0_in_use)
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if (prescale++ >= hardclock_prescale) {
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hardclock(frame);
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prescale = 0;
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}
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}
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int
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acquire_timer0(int rate, void (*function)() )
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{
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if (timer0_in_use) /* XXX || (rate < 20000 && rate % hz)) */
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return -1;
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timer0_in_use = 1;
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timer0_rate = rate;
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prescale = 0;
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hardclock_prescale = rate/hz;
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outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
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outb(TIMER_CNTR0, TIMER_DIV(rate)%256);
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outb(TIMER_CNTR0, TIMER_DIV(rate)/256);
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if (function)
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timer_func = function;
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return 0;
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}
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int
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acquire_timer2(int mode)
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{
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if (timer2_in_use)
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return -1;
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timer2_in_use = 1;
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outb(TIMER_MODE, TIMER_SEL2 | (mode &0x3f));
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return 0;
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}
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int
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release_timer0()
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{
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if (!timer0_in_use)
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return -1;
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timer0_in_use = 0;
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timer0_rate = hz;
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outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
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outb(TIMER_CNTR0, TIMER_DIV(hz)%256);
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outb(TIMER_CNTR0, TIMER_DIV(hz)/256);
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timer_func = hardclock;
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return 0;
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}
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int
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release_timer2()
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{
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if (!timer2_in_use)
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return -1;
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timer2_in_use = 0;
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outb(TIMER_MODE, TIMER_SEL2|TIMER_SQWAVE|TIMER_16BIT);
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return 0;
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}
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static int
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getit()
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{
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int high, low;
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disable_intr();
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/* select timer0 and latch counter value */
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outb(TIMER_MODE, TIMER_SEL0);
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low = inb(TIMER_CNTR0);
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high = inb(TIMER_CNTR0);
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enable_intr();
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return ((high << 8) | low);
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}
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/*
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* Wait "n" microseconds.
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* Relies on timer 1 counting down from (TIMER_FREQ / hz)
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* Note: timer had better have been programmed before this is first used!
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*/
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void
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DELAY(int n)
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{
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int counter_limit, prev_tick, tick, ticks_left, sec, usec;
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#ifdef DELAYDEBUG
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int getit_calls = 1;
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int n1;
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static int state = 0;
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if (state == 0) {
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state = 1;
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for (n1 = 1; n1 <= 10000000; n1 *= 10)
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DELAY(n1);
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state = 2;
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}
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if (state == 1)
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printf("DELAY(%d)...", n);
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#endif
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/*
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* 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;
|
||||
|
||||
counter_limit = TIMER_FREQ/timer0_rate;
|
||||
while (ticks_left > 0) {
|
||||
tick = getit(0, 0);
|
||||
#ifdef DELAYDEBUG
|
||||
++getit_calls;
|
||||
#endif
|
||||
if (tick > prev_tick)
|
||||
ticks_left -= prev_tick - (tick - counter_limit);
|
||||
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() /* SOS XXX dummy is not needed */
|
||||
{
|
||||
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;
|
||||
outb(TIMER_CNTR2, pitch);
|
||||
outb(TIMER_CNTR2, (pitch>>8));
|
||||
if (!beeping) {
|
||||
outb(IO_PPI, inb(IO_PPI) | 3); /* enable counter2 output to speaker */
|
||||
beeping = period;
|
||||
timeout(sysbeepstop, 0, period);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
startrtclock()
|
||||
{
|
||||
@ -69,8 +254,9 @@ startrtclock()
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
|
||||
/* Correct rounding will buy us a better precision in timekeeping */
|
||||
outb (IO_TIMER1, (TIMER_FREQ+hz/2)/hz);
|
||||
outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)%256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)/256);
|
||||
timer0_rate = hz;
|
||||
|
||||
/* initialize brain-dead battery powered clock */
|
||||
outb (IO_RTC, RTC_STATUSA);
|
||||
@ -83,7 +269,6 @@ startrtclock()
|
||||
printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
|
||||
}
|
||||
|
||||
unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
|
||||
|
||||
#define FIRST_GUESS 0x2000
|
||||
static void
|
||||
@ -93,7 +278,7 @@ findcpuspeed()
|
||||
unsigned int remainder;
|
||||
|
||||
/* Put counter in count down mode */
|
||||
outb(IO_TIMER1+3, 0x34);
|
||||
outb(TIMER_MODE, TIMER_16BIT|TIMER_RATEGEN);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
delaycount = FIRST_GUESS;
|
||||
@ -111,16 +296,15 @@ findcpuspeed()
|
||||
|
||||
/* convert 2 digit BCD number */
|
||||
int
|
||||
bcd(i)
|
||||
int i;
|
||||
bcd(int i)
|
||||
{
|
||||
return ((i/16)*10 + (i%16));
|
||||
}
|
||||
|
||||
|
||||
/* convert years to seconds (from 1970) */
|
||||
unsigned long
|
||||
ytos(y)
|
||||
int y;
|
||||
ytos(int y)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
@ -133,16 +317,16 @@ int y;
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/* convert months to seconds */
|
||||
unsigned long
|
||||
mtos(m,leap)
|
||||
int m,leap;
|
||||
mtos(int m, int leap)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
|
||||
ret = 0;
|
||||
for(i=1;i<m;i++) {
|
||||
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;
|
||||
@ -162,11 +346,10 @@ int m,leap;
|
||||
* from a filesystem.
|
||||
*/
|
||||
void
|
||||
inittodr(base)
|
||||
time_t base;
|
||||
inittodr(time_t base)
|
||||
{
|
||||
unsigned long sec;
|
||||
int leap,day_week,t,yd;
|
||||
int leap, day_week, t, yd;
|
||||
int sa,s;
|
||||
|
||||
/* do we have a realtime clock present? (otherwise we loop below) */
|
||||
@ -180,26 +363,25 @@ inittodr(base)
|
||||
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 */
|
||||
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(base)
|
||||
time_t base;
|
||||
test_inittodr(time_t base)
|
||||
{
|
||||
|
||||
outb(IO_RTC,9); /* year */
|
||||
@ -219,6 +401,7 @@ test_inittodr(base)
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* Restart the clock.
|
||||
*/
|
||||
@ -227,12 +410,14 @@ resettodr()
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Wire clock interrupt in.
|
||||
*/
|
||||
#define V(s) __CONCAT(V, s)
|
||||
extern void V(clk)();
|
||||
|
||||
|
||||
void
|
||||
enablertclock()
|
||||
{
|
||||
@ -240,12 +425,12 @@ enablertclock()
|
||||
INTREN(IRQ0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Delay for some number of milliseconds.
|
||||
*/
|
||||
void
|
||||
spinwait(millisecs)
|
||||
int millisecs;
|
||||
spinwait(int millisecs)
|
||||
{
|
||||
DELAY(1000 * millisecs);
|
||||
}
|
||||
|
||||
@ -34,7 +34,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
|
||||
* $Id: clock.c,v 1.5 1993/12/19 00:50:30 wollman Exp $
|
||||
* $Id: clock.c,v 1.6 1994/02/06 22:48:13 davidg Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -45,6 +45,7 @@
|
||||
#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"
|
||||
@ -55,9 +56,193 @@
|
||||
#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 void findcpuspeed(void);
|
||||
|
||||
static char timer0_in_use = 0, timer2_in_use = 0;
|
||||
static int timer0_rate = 100; /* XXX should be hz */
|
||||
static void (*timer_func)() = hardclock;
|
||||
static unsigned int prescale = 0;
|
||||
static unsigned int hardclock_prescale;
|
||||
static int beeping;
|
||||
unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
|
||||
|
||||
|
||||
void
|
||||
timerintr(struct intrframe frame)
|
||||
{
|
||||
timer_func(frame);
|
||||
if (timer0_in_use)
|
||||
if (prescale++ >= hardclock_prescale) {
|
||||
hardclock(frame);
|
||||
prescale = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
acquire_timer0(int rate, void (*function)() )
|
||||
{
|
||||
if (timer0_in_use) /* XXX || (rate < 20000 && rate % hz)) */
|
||||
return -1;
|
||||
timer0_in_use = 1;
|
||||
timer0_rate = rate;
|
||||
prescale = 0;
|
||||
hardclock_prescale = rate/hz;
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(rate)%256);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(rate)/256);
|
||||
if (function)
|
||||
timer_func = function;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
acquire_timer2(int mode)
|
||||
{
|
||||
if (timer2_in_use)
|
||||
return -1;
|
||||
timer2_in_use = 1;
|
||||
outb(TIMER_MODE, TIMER_SEL2 | (mode &0x3f));
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
release_timer0()
|
||||
{
|
||||
if (!timer0_in_use)
|
||||
return -1;
|
||||
timer0_in_use = 0;
|
||||
timer0_rate = hz;
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(hz)%256);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(hz)/256);
|
||||
timer_func = hardclock;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
release_timer2()
|
||||
{
|
||||
if (!timer2_in_use)
|
||||
return -1;
|
||||
timer2_in_use = 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;
|
||||
|
||||
counter_limit = TIMER_FREQ/timer0_rate;
|
||||
while (ticks_left > 0) {
|
||||
tick = getit(0, 0);
|
||||
#ifdef DELAYDEBUG
|
||||
++getit_calls;
|
||||
#endif
|
||||
if (tick > prev_tick)
|
||||
ticks_left -= prev_tick - (tick - counter_limit);
|
||||
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() /* SOS XXX dummy is not needed */
|
||||
{
|
||||
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;
|
||||
outb(TIMER_CNTR2, pitch);
|
||||
outb(TIMER_CNTR2, (pitch>>8));
|
||||
if (!beeping) {
|
||||
outb(IO_PPI, inb(IO_PPI) | 3); /* enable counter2 output to speaker */
|
||||
beeping = period;
|
||||
timeout(sysbeepstop, 0, period);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
startrtclock()
|
||||
{
|
||||
@ -69,8 +254,9 @@ startrtclock()
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
|
||||
/* Correct rounding will buy us a better precision in timekeeping */
|
||||
outb (IO_TIMER1, (TIMER_FREQ+hz/2)/hz);
|
||||
outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)%256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)/256);
|
||||
timer0_rate = hz;
|
||||
|
||||
/* initialize brain-dead battery powered clock */
|
||||
outb (IO_RTC, RTC_STATUSA);
|
||||
@ -83,7 +269,6 @@ startrtclock()
|
||||
printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
|
||||
}
|
||||
|
||||
unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
|
||||
|
||||
#define FIRST_GUESS 0x2000
|
||||
static void
|
||||
@ -93,7 +278,7 @@ findcpuspeed()
|
||||
unsigned int remainder;
|
||||
|
||||
/* Put counter in count down mode */
|
||||
outb(IO_TIMER1+3, 0x34);
|
||||
outb(TIMER_MODE, TIMER_16BIT|TIMER_RATEGEN);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
delaycount = FIRST_GUESS;
|
||||
@ -111,16 +296,15 @@ findcpuspeed()
|
||||
|
||||
/* convert 2 digit BCD number */
|
||||
int
|
||||
bcd(i)
|
||||
int i;
|
||||
bcd(int i)
|
||||
{
|
||||
return ((i/16)*10 + (i%16));
|
||||
}
|
||||
|
||||
|
||||
/* convert years to seconds (from 1970) */
|
||||
unsigned long
|
||||
ytos(y)
|
||||
int y;
|
||||
ytos(int y)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
@ -133,16 +317,16 @@ int y;
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/* convert months to seconds */
|
||||
unsigned long
|
||||
mtos(m,leap)
|
||||
int m,leap;
|
||||
mtos(int m, int leap)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
|
||||
ret = 0;
|
||||
for(i=1;i<m;i++) {
|
||||
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;
|
||||
@ -162,11 +346,10 @@ int m,leap;
|
||||
* from a filesystem.
|
||||
*/
|
||||
void
|
||||
inittodr(base)
|
||||
time_t base;
|
||||
inittodr(time_t base)
|
||||
{
|
||||
unsigned long sec;
|
||||
int leap,day_week,t,yd;
|
||||
int leap, day_week, t, yd;
|
||||
int sa,s;
|
||||
|
||||
/* do we have a realtime clock present? (otherwise we loop below) */
|
||||
@ -180,26 +363,25 @@ inittodr(base)
|
||||
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 */
|
||||
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(base)
|
||||
time_t base;
|
||||
test_inittodr(time_t base)
|
||||
{
|
||||
|
||||
outb(IO_RTC,9); /* year */
|
||||
@ -219,6 +401,7 @@ test_inittodr(base)
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* Restart the clock.
|
||||
*/
|
||||
@ -227,12 +410,14 @@ resettodr()
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Wire clock interrupt in.
|
||||
*/
|
||||
#define V(s) __CONCAT(V, s)
|
||||
extern void V(clk)();
|
||||
|
||||
|
||||
void
|
||||
enablertclock()
|
||||
{
|
||||
@ -240,12 +425,12 @@ enablertclock()
|
||||
INTREN(IRQ0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Delay for some number of milliseconds.
|
||||
*/
|
||||
void
|
||||
spinwait(millisecs)
|
||||
int millisecs;
|
||||
spinwait(int millisecs)
|
||||
{
|
||||
DELAY(1000 * millisecs);
|
||||
}
|
||||
|
||||
@ -34,7 +34,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
|
||||
* $Id: clock.c,v 1.5 1993/12/19 00:50:30 wollman Exp $
|
||||
* $Id: clock.c,v 1.6 1994/02/06 22:48:13 davidg Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -45,6 +45,7 @@
|
||||
#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"
|
||||
@ -55,9 +56,193 @@
|
||||
#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 void findcpuspeed(void);
|
||||
|
||||
static char timer0_in_use = 0, timer2_in_use = 0;
|
||||
static int timer0_rate = 100; /* XXX should be hz */
|
||||
static void (*timer_func)() = hardclock;
|
||||
static unsigned int prescale = 0;
|
||||
static unsigned int hardclock_prescale;
|
||||
static int beeping;
|
||||
unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
|
||||
|
||||
|
||||
void
|
||||
timerintr(struct intrframe frame)
|
||||
{
|
||||
timer_func(frame);
|
||||
if (timer0_in_use)
|
||||
if (prescale++ >= hardclock_prescale) {
|
||||
hardclock(frame);
|
||||
prescale = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
acquire_timer0(int rate, void (*function)() )
|
||||
{
|
||||
if (timer0_in_use) /* XXX || (rate < 20000 && rate % hz)) */
|
||||
return -1;
|
||||
timer0_in_use = 1;
|
||||
timer0_rate = rate;
|
||||
prescale = 0;
|
||||
hardclock_prescale = rate/hz;
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(rate)%256);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(rate)/256);
|
||||
if (function)
|
||||
timer_func = function;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
acquire_timer2(int mode)
|
||||
{
|
||||
if (timer2_in_use)
|
||||
return -1;
|
||||
timer2_in_use = 1;
|
||||
outb(TIMER_MODE, TIMER_SEL2 | (mode &0x3f));
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
release_timer0()
|
||||
{
|
||||
if (!timer0_in_use)
|
||||
return -1;
|
||||
timer0_in_use = 0;
|
||||
timer0_rate = hz;
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(hz)%256);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(hz)/256);
|
||||
timer_func = hardclock;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
release_timer2()
|
||||
{
|
||||
if (!timer2_in_use)
|
||||
return -1;
|
||||
timer2_in_use = 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;
|
||||
|
||||
counter_limit = TIMER_FREQ/timer0_rate;
|
||||
while (ticks_left > 0) {
|
||||
tick = getit(0, 0);
|
||||
#ifdef DELAYDEBUG
|
||||
++getit_calls;
|
||||
#endif
|
||||
if (tick > prev_tick)
|
||||
ticks_left -= prev_tick - (tick - counter_limit);
|
||||
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() /* SOS XXX dummy is not needed */
|
||||
{
|
||||
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;
|
||||
outb(TIMER_CNTR2, pitch);
|
||||
outb(TIMER_CNTR2, (pitch>>8));
|
||||
if (!beeping) {
|
||||
outb(IO_PPI, inb(IO_PPI) | 3); /* enable counter2 output to speaker */
|
||||
beeping = period;
|
||||
timeout(sysbeepstop, 0, period);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
startrtclock()
|
||||
{
|
||||
@ -69,8 +254,9 @@ startrtclock()
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
|
||||
/* Correct rounding will buy us a better precision in timekeeping */
|
||||
outb (IO_TIMER1, (TIMER_FREQ+hz/2)/hz);
|
||||
outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)%256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)/256);
|
||||
timer0_rate = hz;
|
||||
|
||||
/* initialize brain-dead battery powered clock */
|
||||
outb (IO_RTC, RTC_STATUSA);
|
||||
@ -83,7 +269,6 @@ startrtclock()
|
||||
printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
|
||||
}
|
||||
|
||||
unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
|
||||
|
||||
#define FIRST_GUESS 0x2000
|
||||
static void
|
||||
@ -93,7 +278,7 @@ findcpuspeed()
|
||||
unsigned int remainder;
|
||||
|
||||
/* Put counter in count down mode */
|
||||
outb(IO_TIMER1+3, 0x34);
|
||||
outb(TIMER_MODE, TIMER_16BIT|TIMER_RATEGEN);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
delaycount = FIRST_GUESS;
|
||||
@ -111,16 +296,15 @@ findcpuspeed()
|
||||
|
||||
/* convert 2 digit BCD number */
|
||||
int
|
||||
bcd(i)
|
||||
int i;
|
||||
bcd(int i)
|
||||
{
|
||||
return ((i/16)*10 + (i%16));
|
||||
}
|
||||
|
||||
|
||||
/* convert years to seconds (from 1970) */
|
||||
unsigned long
|
||||
ytos(y)
|
||||
int y;
|
||||
ytos(int y)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
@ -133,16 +317,16 @@ int y;
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/* convert months to seconds */
|
||||
unsigned long
|
||||
mtos(m,leap)
|
||||
int m,leap;
|
||||
mtos(int m, int leap)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
|
||||
ret = 0;
|
||||
for(i=1;i<m;i++) {
|
||||
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;
|
||||
@ -162,11 +346,10 @@ int m,leap;
|
||||
* from a filesystem.
|
||||
*/
|
||||
void
|
||||
inittodr(base)
|
||||
time_t base;
|
||||
inittodr(time_t base)
|
||||
{
|
||||
unsigned long sec;
|
||||
int leap,day_week,t,yd;
|
||||
int leap, day_week, t, yd;
|
||||
int sa,s;
|
||||
|
||||
/* do we have a realtime clock present? (otherwise we loop below) */
|
||||
@ -180,26 +363,25 @@ inittodr(base)
|
||||
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 */
|
||||
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(base)
|
||||
time_t base;
|
||||
test_inittodr(time_t base)
|
||||
{
|
||||
|
||||
outb(IO_RTC,9); /* year */
|
||||
@ -219,6 +401,7 @@ test_inittodr(base)
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* Restart the clock.
|
||||
*/
|
||||
@ -227,12 +410,14 @@ resettodr()
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Wire clock interrupt in.
|
||||
*/
|
||||
#define V(s) __CONCAT(V, s)
|
||||
extern void V(clk)();
|
||||
|
||||
|
||||
void
|
||||
enablertclock()
|
||||
{
|
||||
@ -240,12 +425,12 @@ enablertclock()
|
||||
INTREN(IRQ0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Delay for some number of milliseconds.
|
||||
*/
|
||||
void
|
||||
spinwait(millisecs)
|
||||
int millisecs;
|
||||
spinwait(int millisecs)
|
||||
{
|
||||
DELAY(1000 * millisecs);
|
||||
}
|
||||
|
||||
231
sys/isa/atrtc.c
231
sys/isa/atrtc.c
@ -34,7 +34,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
|
||||
* $Id: clock.c,v 1.5 1993/12/19 00:50:30 wollman Exp $
|
||||
* $Id: clock.c,v 1.6 1994/02/06 22:48:13 davidg Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -45,6 +45,7 @@
|
||||
#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"
|
||||
@ -55,9 +56,193 @@
|
||||
#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 void findcpuspeed(void);
|
||||
|
||||
static char timer0_in_use = 0, timer2_in_use = 0;
|
||||
static int timer0_rate = 100; /* XXX should be hz */
|
||||
static void (*timer_func)() = hardclock;
|
||||
static unsigned int prescale = 0;
|
||||
static unsigned int hardclock_prescale;
|
||||
static int beeping;
|
||||
unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
|
||||
|
||||
|
||||
void
|
||||
timerintr(struct intrframe frame)
|
||||
{
|
||||
timer_func(frame);
|
||||
if (timer0_in_use)
|
||||
if (prescale++ >= hardclock_prescale) {
|
||||
hardclock(frame);
|
||||
prescale = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
acquire_timer0(int rate, void (*function)() )
|
||||
{
|
||||
if (timer0_in_use) /* XXX || (rate < 20000 && rate % hz)) */
|
||||
return -1;
|
||||
timer0_in_use = 1;
|
||||
timer0_rate = rate;
|
||||
prescale = 0;
|
||||
hardclock_prescale = rate/hz;
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(rate)%256);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(rate)/256);
|
||||
if (function)
|
||||
timer_func = function;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
acquire_timer2(int mode)
|
||||
{
|
||||
if (timer2_in_use)
|
||||
return -1;
|
||||
timer2_in_use = 1;
|
||||
outb(TIMER_MODE, TIMER_SEL2 | (mode &0x3f));
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
release_timer0()
|
||||
{
|
||||
if (!timer0_in_use)
|
||||
return -1;
|
||||
timer0_in_use = 0;
|
||||
timer0_rate = hz;
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(hz)%256);
|
||||
outb(TIMER_CNTR0, TIMER_DIV(hz)/256);
|
||||
timer_func = hardclock;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
release_timer2()
|
||||
{
|
||||
if (!timer2_in_use)
|
||||
return -1;
|
||||
timer2_in_use = 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;
|
||||
|
||||
counter_limit = TIMER_FREQ/timer0_rate;
|
||||
while (ticks_left > 0) {
|
||||
tick = getit(0, 0);
|
||||
#ifdef DELAYDEBUG
|
||||
++getit_calls;
|
||||
#endif
|
||||
if (tick > prev_tick)
|
||||
ticks_left -= prev_tick - (tick - counter_limit);
|
||||
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() /* SOS XXX dummy is not needed */
|
||||
{
|
||||
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;
|
||||
outb(TIMER_CNTR2, pitch);
|
||||
outb(TIMER_CNTR2, (pitch>>8));
|
||||
if (!beeping) {
|
||||
outb(IO_PPI, inb(IO_PPI) | 3); /* enable counter2 output to speaker */
|
||||
beeping = period;
|
||||
timeout(sysbeepstop, 0, period);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
startrtclock()
|
||||
{
|
||||
@ -69,8 +254,9 @@ startrtclock()
|
||||
outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
|
||||
|
||||
/* Correct rounding will buy us a better precision in timekeeping */
|
||||
outb (IO_TIMER1, (TIMER_FREQ+hz/2)/hz);
|
||||
outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)%256);
|
||||
outb (IO_TIMER1, TIMER_DIV(hz)/256);
|
||||
timer0_rate = hz;
|
||||
|
||||
/* initialize brain-dead battery powered clock */
|
||||
outb (IO_RTC, RTC_STATUSA);
|
||||
@ -83,7 +269,6 @@ startrtclock()
|
||||
printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
|
||||
}
|
||||
|
||||
unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
|
||||
|
||||
#define FIRST_GUESS 0x2000
|
||||
static void
|
||||
@ -93,7 +278,7 @@ findcpuspeed()
|
||||
unsigned int remainder;
|
||||
|
||||
/* Put counter in count down mode */
|
||||
outb(IO_TIMER1+3, 0x34);
|
||||
outb(TIMER_MODE, TIMER_16BIT|TIMER_RATEGEN);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
outb(IO_TIMER1, 0xff);
|
||||
delaycount = FIRST_GUESS;
|
||||
@ -111,16 +296,15 @@ findcpuspeed()
|
||||
|
||||
/* convert 2 digit BCD number */
|
||||
int
|
||||
bcd(i)
|
||||
int i;
|
||||
bcd(int i)
|
||||
{
|
||||
return ((i/16)*10 + (i%16));
|
||||
}
|
||||
|
||||
|
||||
/* convert years to seconds (from 1970) */
|
||||
unsigned long
|
||||
ytos(y)
|
||||
int y;
|
||||
ytos(int y)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
@ -133,16 +317,16 @@ int y;
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
/* convert months to seconds */
|
||||
unsigned long
|
||||
mtos(m,leap)
|
||||
int m,leap;
|
||||
mtos(int m, int leap)
|
||||
{
|
||||
int i;
|
||||
unsigned long ret;
|
||||
|
||||
ret = 0;
|
||||
for(i=1;i<m;i++) {
|
||||
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;
|
||||
@ -162,11 +346,10 @@ int m,leap;
|
||||
* from a filesystem.
|
||||
*/
|
||||
void
|
||||
inittodr(base)
|
||||
time_t base;
|
||||
inittodr(time_t base)
|
||||
{
|
||||
unsigned long sec;
|
||||
int leap,day_week,t,yd;
|
||||
int leap, day_week, t, yd;
|
||||
int sa,s;
|
||||
|
||||
/* do we have a realtime clock present? (otherwise we loop below) */
|
||||
@ -180,26 +363,25 @@ inittodr(base)
|
||||
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 */
|
||||
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(base)
|
||||
time_t base;
|
||||
test_inittodr(time_t base)
|
||||
{
|
||||
|
||||
outb(IO_RTC,9); /* year */
|
||||
@ -219,6 +401,7 @@ test_inittodr(base)
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* Restart the clock.
|
||||
*/
|
||||
@ -227,12 +410,14 @@ resettodr()
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Wire clock interrupt in.
|
||||
*/
|
||||
#define V(s) __CONCAT(V, s)
|
||||
extern void V(clk)();
|
||||
|
||||
|
||||
void
|
||||
enablertclock()
|
||||
{
|
||||
@ -240,12 +425,12 @@ enablertclock()
|
||||
INTREN(IRQ0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Delay for some number of milliseconds.
|
||||
*/
|
||||
void
|
||||
spinwait(millisecs)
|
||||
int millisecs;
|
||||
spinwait(int millisecs)
|
||||
{
|
||||
DELAY(1000 * millisecs);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user