586 lines
15 KiB
C
586 lines
15 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)clock.c 1.1 92/07/30 SMI";
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#endif
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/*
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* Copyright (c) 1987 by Sun Microsystems, Inc.
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <machine/clock.h>
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#include <machine/interreg.h>
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#include <machine/cpu.h>
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struct timeval todget();
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/*
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* Defines for conversion between binary and bcd representation. These are
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* necessary for the Mostek 48T02 TOD clock regs. (Works only on 8 bit
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* unsigned values.)
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*/
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#define bcdtob(x) (((x) & 0xf) + 10 * ((x) >> 4))
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#define btobcd(x) ((((x) / 10) << 4) + ((x) % 10))
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int clock_type = 0;
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/*
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* Machine-dependent clock routines.
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*
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* Startrtclock restarts the real-time clock, which provides hardclock
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* interrupts to kern_clock.c.
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*
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* Inittodr initializes the time of day hardware which provides date functions.
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* Its primary function is to use some file system information in case the
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* hardare clock lost state.
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*
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* Resettodr restores the time of day hardware after a time change.
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*/
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/*
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* Start the real-time clock.
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*/
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startrtclock()
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{
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/*
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* We will set things up to interrupt every 1/100 of a second.
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* locore.s currently only calls hardclock every other clock
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* interrupt, thus assuming 50 hz operation.
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*/
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if (hz != 50)
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panic("startrtclock");
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/*
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* Determine the clock type (intersil7170 vs mostek48t02). Attempt to
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* read a register on the intersil 7170.
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*/
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#ifndef SAS
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#ifdef SUN3X_80
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/* XXX Hardware problem, 3X/80 can't tell if a INTERSIL7170 exists */
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if (cpu == CPU_SUN3X_80)
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clock_type = MOSTEK48T02;
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else
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#endif /* SUN3X_80 */
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if (peekc((char *) CLKADDR) != -1) {
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clock_type = INTERSIL7170;
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/* set 1/100 sec clock intr */
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CLKADDR->clk_intrreg = CLK_INT_HSEC;
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} else {
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/* machine using this clock will set 1/100 sec clock intr */
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clock_type = MOSTEK48T02;
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}
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#endif /* !SAS */
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set_clk_mode(IR_ENA_CLK5, 0); /* turn on level 5 clock intr */
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}
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/*
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* Set and/or clear the desired clock bits in the interrupt register. We
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* have to be extremely careful that we do it in such a manner that we don't
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* get ourselves lost.
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*/
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set_clk_mode(on, off)
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u_char on, off;
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{
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register u_char interreg, dummy;
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/*
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* make sure that we are only playing w/ clock interrupt register
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* bits
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*/
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on &= (IR_ENA_CLK7 | IR_ENA_CLK5);
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off &= (IR_ENA_CLK7 | IR_ENA_CLK5);
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/*
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* Get a copy of current interrupt register, turning off any
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* undesired bits (aka `off')
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*/
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interreg = *INTERREG & ~(off | IR_ENA_INT);
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*INTERREG &= ~IR_ENA_INT;
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/*
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* Next we turns off the CLK5 and CLK7 bits to clear the flip-flops,
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* then we disable clock interrupts. Now we can read the clock's
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* interrupt register to clear any pending signals there.
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*/
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*INTERREG &= ~(IR_ENA_CLK7 | IR_ENA_CLK5);
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#ifndef SAS
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if (clock_type == INTERSIL7170) {
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CLKADDR->clk_cmd = (CLK_CMD_NORMAL & ~CLK_CMD_INTRENA);
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dummy = CLKADDR->clk_intrreg; /* clear clock */
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}
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#endif /* !SAS */
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#ifdef lint
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dummy = dummy;
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#endif
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/*
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* Now we set all the desired bits in the interrupt register, then we
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* turn the clock back on and finally we can enable all interrupts.
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*/
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*INTERREG |= (interreg | on); /* enable flip-flops */
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#ifndef SAS
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if (clock_type == INTERSIL7170) {
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CLKADDR->clk_cmd = CLK_CMD_NORMAL; /* enable clock intr */
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}
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#endif /* !SAS */
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*INTERREG |= IR_ENA_INT; /* enable interrupts */
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}
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int dosynctodr = 1; /* if true, sync UNIX time to TOD */
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int clkdrift = 0; /* if true, show UNIX & TOD sync differences */
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int synctodrval = 30; /* number of seconds between synctodr */
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extern long timedelta;
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extern int tickadj;
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extern int tickdelta;
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extern int doresettodr;
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/* if true, continue to check time, but do not correct drift */
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/*
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* Commented out since it's not used in 3x, and lint complains. int
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* allowdrift = 0;
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*/
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/* if true, correct large jumps by resetting tod clock */
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int fixtodjump = 1;
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/* if true, report all tod errors */
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int toddebug = 0;
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#define ABS(x) ((x) < 0? -(x) : (x))
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int todsyncat = 0;
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synctodr()
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{
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struct timeval tv;
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int deltat, s;
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int sch = synctodrval * hz - 2;
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/*
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* If timedelta is non-zero, assume someone who knows better is
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* already adjusting the time. Don't assume that this nice person is
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* going to hang around forever, tho.
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*/
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if (dosynctodr && timedelta == 0 && doresettodr == 0) {
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s = splclock();
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tv = todget();
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/*
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* Sorry about the gotos, but in this case they are more
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* clear than nested conditionals or a do { ... } while (0);
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* construct with multiple break statements, or replication
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* of the splx() and timeout() code. All of the gotos here
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* branch down to the bottom of the current conditional, just
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* above where the priority is restored.
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*/
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/*
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* Several machines have clock chips that only give us one
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* second of precision; for them, we must hang out until the
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* clock changes. When this happens, we can assume we are
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* near (within 10ms) the beginning of the second, and apply
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* the normal algorithm.
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*
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* Systems with higher precision clocks are not hurt by having
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* this run, since the overhead is nearly zero, so we just go
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* ahead and do it everywhere.
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*/
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if (!todsyncat)
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todsyncat = tv.tv_sec;
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if (todsyncat == tv.tv_sec) {
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sch = 1;
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goto bottom;
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}
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/*
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* Sanity check: if todget is returning zeros, bitch and turn
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* off clock synchronization. The old code would flail about
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* madly.
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*/
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if (tv.tv_sec == 0) {
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printf("synctodr: unable to read clock chip\n");
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dosynctodr = 0;
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goto bottom;
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}
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/*
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* Sanity check: if the two clocks are out of sync by more
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* than about 2000 seconds, complain and turn off sync;
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* continuing would result in integer overflows resulting in
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* synchronizing to the wrong time.
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*/
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deltat = tv.tv_sec - time.tv_sec;
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if (ABS(deltat) > 2000) {
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printf("synctodr: unable to sync\n");
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dosynctodr = 0;
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goto bottom;
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}
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/*
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* Calculate how far off we are. If we are out by more than
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* one clock tick, set up timedelta and tickdelta so that
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* hardclock() will increment the software clock a bit fast
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* or a bit slow. How fast or how slow is determined by
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* tickadj, the number of microseconds of correction applied
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* each tick.
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*/
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deltat = deltat * 1000000 + tv.tv_usec - time.tv_usec;
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if (ABS(deltat) > 1000000 / hz) {
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timedelta = deltat;
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tickdelta = tickadj; /* standard slew rate */
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if (clkdrift)
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printf("<[%d]> ", deltat / 1000);
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}
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todsyncat = 0;
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bottom:
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(void) splx(s);
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}
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timeout(synctodr, (caddr_t) 0, sch);
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}
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/*
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* Initialize the system time, based on the time base which is, e.g. from a
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* filesystem. A base of -1 means the file system doesn't keep time.
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*/
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inittodr(base)
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time_t base;
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{
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register long deltat;
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int s;
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s = splclock();
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time = todget();
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(void) splx(s);
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if (time.tv_sec < SECYR) {
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if (base == -1)
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time.tv_sec = (87 - YRREF) * SECYR; /* ~1987 */
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else
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time.tv_sec = base;
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printf("WARNING: TOD clock not initialized");
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resettodr();
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goto check;
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}
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if (base == -1)
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goto out;
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if (base < (87 - YRREF) * SECYR) { /* ~1987 */
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printf("WARNING: preposterous time in file system");
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goto check;
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}
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deltat = time.tv_sec - base;
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/*
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* See if we gained/lost two or more days; if so, assume something is
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* amiss.
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*/
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if (deltat < 0)
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deltat = -deltat;
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if (deltat < 2 * SECDAY)
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goto out;
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printf("WARNING: clock %s %d days",
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time.tv_sec < base ? "lost" : "gained", deltat / SECDAY);
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check:
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printf(" -- CHECK AND RESET THE DATE!\n");
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out:
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if (dosynctodr)
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timeout(synctodr, (caddr_t) 0, synctodrval * hz);
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}
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/*
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* For Sun-3, we use the Intersil ICM7170 for both the real time clock and
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* the time-of-day device.
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*/
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static u_int monthsec[12] = {
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31 * SECDAY, /* Jan */
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28 * SECDAY, /* Feb */
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31 * SECDAY, /* Mar */
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30 * SECDAY, /* Apr */
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31 * SECDAY, /* May */
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30 * SECDAY, /* Jun */
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31 * SECDAY, /* Jul */
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31 * SECDAY, /* Aug */
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30 * SECDAY, /* Sep */
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31 * SECDAY, /* Oct */
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30 * SECDAY, /* Nov */
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31 * SECDAY /* Dec */
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};
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#define MONTHSEC(mon, yr) \
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(((((yr) % 4) == 0) && ((mon) == 2))? 29*SECDAY : monthsec[(mon) - 1])
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/*
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* Set the TOD based on the argument value; used when the TOD has a
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* preposterous value and also when the time is reset by the settimeofday
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* system call. We run at splclock() to avoid synctodr() from running and
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* getting confused.
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*/
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resettodr()
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{
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register int t;
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u_short hsec, sec, min, hour, day, mon, weekday, year;
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int s;
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s = splclock();
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t = time.tv_sec;
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/*
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* Figure out the weekday
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*/
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weekday = (t / (60 * 60 * 24) + 2) % 7 + 1; /* 1..7 */
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/*
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* Figure out the (adjusted) year
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*/
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for (year = (YRREF - YRBASE); t > SECYEAR(year); year++)
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t -= SECYEAR(year);
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/*
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* Figure out what month this is by subtracting off time per month,
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* adjust for leap year if appropriate.
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*/
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for (mon = 1; t >= 0; mon++)
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t -= MONTHSEC(mon, year);
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mon--; /* back off one month */
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t += MONTHSEC(mon, year);
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sec = t % 60; /* seconds */
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t /= 60;
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min = t % 60; /* minutes */
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t /= 60;
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hour = t % 24; /* hours (24 hour format) */
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day = t / 24; /* day of the month */
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day++; /* adjust to start at 1 */
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hsec = time.tv_usec / 10000;
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#ifndef SAS
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if (clock_type == INTERSIL7170) {
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CLKADDR->clk_cmd = (CLK_CMD_NORMAL & ~CLK_CMD_RUN);
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CLKADDR->clk_weekday = weekday % 7; /* 0..6 */
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CLKADDR->clk_year = year;
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CLKADDR->clk_mon = mon;
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CLKADDR->clk_day = day;
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CLKADDR->clk_hour = hour;
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CLKADDR->clk_min = min;
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CLKADDR->clk_sec = sec;
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CLKADDR->clk_hsec = hsec;
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CLKADDR->clk_cmd = CLK_CMD_NORMAL;
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} else if (clock_type == MOSTEK48T02) {
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CLK1ADDR->clk_ctrl |= CLK_CTRL_WRITE;
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CLK1ADDR->clk_sec = btobcd(sec) & CLK_SEC_MASK;
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CLK1ADDR->clk_min = btobcd(min) & CLK_MIN_MASK;
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CLK1ADDR->clk_hour = btobcd(hour) & CLK_HOUR_MASK;
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CLK1ADDR->clk_weekday = btobcd(weekday) & CLK_WEEKDAY_MASK;
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CLK1ADDR->clk_day = btobcd(day) & CLK_DAY_MASK;
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CLK1ADDR->clk_month = btobcd(mon) & CLK_MONTH_MASK;
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CLK1ADDR->clk_year = btobcd(year);
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CLK1ADDR->clk_ctrl &= ~CLK_CTRL_WRITE;
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}
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#endif /* !SAS */
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timedelta = 0; /* destroy any time delta */
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tickdelta = tickadj; /* restore standard slew rate */
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if (toddebug) {
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printf("CLKSET (yr.mo.da.hr.mi.se.hs): %d.%d.%d.%d.%d.%d.%d\n",
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year, mon, day, hour, min, sec, hsec);
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(void) chkdeltat(0);
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}
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(void) splx(s);
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}
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static int jumpdeltat = 2147;
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static u_char now[CLK_WEEKDAY + 1];
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#define TPRINTF if (toddebug) printf
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#define DUMPTIME(x) TPRINTF(\
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"Clock Values (yr.mo.da.hr.mi.se.hs): %d.%d.%d.%d.%d.%d.%d\n", \
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(x)[CLK_YEAR], (x)[CLK_MON], (x)[CLK_DAY], (x)[CLK_HOUR], \
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(x)[CLK_MIN], (x)[CLK_SEC], (x)[CLK_HSEC]);
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static char *glitchstr = "WARNING: Time-of-Day Chip glitch-\n\
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Resetting to internal tick time.\n\
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Please check System date";
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static
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chkdeltat(level)
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{
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struct timeval todget();
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auto struct timeval tv;
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register fail = 0;
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tv = todget();
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if (!tv.tv_sec && !tv.tv_usec) {
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fail = 1; /* major failure 1 */
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TPRINTF("todget rejects read of tod ");
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} else if (ABS(tv.tv_sec - time.tv_sec) > jumpdeltat) {
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fail = 1;
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TPRINTF("Large Magnitude time change (cutoff %d): %d sec\n",
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jumpdeltat, tv.tv_sec - time.tv_sec);
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} else if (tv.tv_sec < time.tv_sec || (tv.tv_sec == time.tv_sec &&
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tv.tv_usec < (time.tv_usec) - (2 * tick))) {
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fail = 1;
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TPRINTF("Time is going backwards: new %d.%d old %d.%d\n",
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tv.tv_sec, tv.tv_usec, time.tv_sec, time.tv_usec);
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}
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if (level > 0) {
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if (fail) {
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TPRINTF("Second Read of TOD Fails\n");
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DUMPTIME(now);
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if (fixtodjump) {
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/*
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* Supposedly, this will only happen if the
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* chip read really fails. This was certainly
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* the case for 3/50s for a while. By
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* extension, 3/260s should have the same
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* problem since they had the same circuit as
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* the 3/50. I don't know about 3/60s, 3/110s
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* and 3/160s.
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*
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* However, then when 4.0 alpha-3 came out,
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* people reported seeing this message on a
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* variety of systems. However, it didn't
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* happen very often, and, as usual, they
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* just complained about it, but weren't very
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* helpful about pointing out which systems
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* it happened on or cooperated about trying
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* to nail it.
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*
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* So, I was in a quandary about to do do. I
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* looked over the code again, think I
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* understood what had changed since I first
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* put this change in (3.4.1), and didn't see
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* how this could happen, except when:
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*
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* 1) time was spent in the monitor or kadb
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*
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* 2) the chip actually *did* glitch.
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*
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* 3) > 60 seconds (jumpdeltat was that that
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* value then) was spent in rewinding a
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* sysgen cartridge tape during boot time
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* when the scsi bus was being probed (known
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* to be possible during installation).
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*
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* In order to solve this problem, I decided
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* that
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*
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* a) jumpdeltat could be as close to the sign
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* extension limit for the u-sec valued
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* deltat. This value is approx. 2147
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* seconds, or nearly 35 minutes.
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*
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*
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* b) I would turn off the warning message. If
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* problems arise, it can be turned back on
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* by an adb patch...
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*
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* matt jacob 9/20/87
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*/
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TPRINTF(glitchstr);
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resettodr();
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}
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return (0);
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} else {
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TPRINTF("Second READ of TOD now shows sanity\n");
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}
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} else if (fail) {
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TPRINTF("First Read of TOD chip shows insanity\n");
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DUMPTIME(now);
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return (chkdeltat(++level));
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}
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return (1000000 * (tv.tv_sec - time.tv_sec) +
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(tv.tv_usec - time.tv_usec));
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}
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static
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readtod(np)
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u_char np[];
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{
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register i;
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register u_char *cp = (u_char *) CLKADDR;
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#ifndef SAS
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if (clock_type == INTERSIL7170) {
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for (i = CLK_HSEC; i <= CLK_WEEKDAY + 1; i++)
|
|
np[i] = *cp++;
|
|
} else if (clock_type == MOSTEK48T02) {
|
|
CLK1ADDR->clk_ctrl |= CLK_CTRL_READ;
|
|
now[CLK_HSEC] = 0; /* XXX perhaps look at a counter ? */
|
|
now[CLK_HOUR] = bcdtob(CLK1ADDR->clk_hour);
|
|
now[CLK_MIN] = bcdtob(CLK1ADDR->clk_min);
|
|
now[CLK_SEC] = bcdtob(CLK1ADDR->clk_sec);
|
|
now[CLK_MON] = bcdtob(CLK1ADDR->clk_month);
|
|
now[CLK_DAY] = bcdtob(CLK1ADDR->clk_day);
|
|
now[CLK_YEAR] = bcdtob(CLK1ADDR->clk_year);
|
|
now[CLK_WEEKDAY] = bcdtob(CLK1ADDR->clk_weekday);
|
|
CLK1ADDR->clk_ctrl &= ~CLK_CTRL_READ;
|
|
}
|
|
#endif /* !SAS */
|
|
}
|
|
|
|
/*
|
|
* Read the current time from the clock chip and convert to UNIX form.
|
|
* Assumes that the year in the counter chip is valid.
|
|
*/
|
|
struct timeval
|
|
todget()
|
|
{
|
|
struct timeval tv;
|
|
register int i, t = 0;
|
|
u_short year;
|
|
|
|
readtod(now);
|
|
|
|
if (now[CLK_MON] < 1 || now[CLK_MON] > 12 ||
|
|
now[CLK_DAY] < 1 || now[CLK_DAY] > 31 ||
|
|
now[CLK_WEEKDAY] > 7 || now[CLK_HOUR] > 23 ||
|
|
now[CLK_MIN] > 59 || now[CLK_SEC] > 59 ||
|
|
now[CLK_YEAR] < (YRREF - YRBASE)) { /* not initialized */
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
return (tv);
|
|
}
|
|
/*
|
|
* Add the number of seconds for each year onto our time t. We start
|
|
* at YRREF - YRBASE (which is the chip's value for UNIX's YRREF
|
|
* year), and count up to the year value given by the chip, adding
|
|
* each years seconds value to the Unix time value we are
|
|
* calculating.
|
|
*/
|
|
for (year = YRREF - YRBASE; year < now[CLK_YEAR]; year++)
|
|
t += SECYEAR(year);
|
|
|
|
/*
|
|
* Now add in the seconds for each month that has gone by this year,
|
|
* adjusting for leap year if appropriate.
|
|
*/
|
|
for (i = 1; i < now[CLK_MON]; i++)
|
|
t += MONTHSEC(i, year);
|
|
|
|
t += (now[CLK_DAY] - 1) * SECDAY;
|
|
t += now[CLK_HOUR] * (60 * 60);
|
|
t += now[CLK_MIN] * 60;
|
|
t += now[CLK_SEC];
|
|
|
|
/*
|
|
* If t is negative, assume bogus time (year was too large) and use 0
|
|
* seconds. XXX - tv_sec and tv_usec should be unsigned.
|
|
*/
|
|
if (t < 0) {
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
} else {
|
|
tv.tv_sec = t;
|
|
tv.tv_usec = now[CLK_HSEC] * 10000;
|
|
}
|
|
return (tv);
|
|
}
|