466 lines
12 KiB
C
466 lines
12 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)clock.c 1.1 94/10/31 Copyr 1986 Sun Micro";
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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/mmu.h>
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#include <machine/clock.h>
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#include <machine/intreg.h>
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struct timeval todget();
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int clock_type;
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/*
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* Defines for conversino 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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/*
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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. We set things up to interrupt every 1/100 of a
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* second.
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*/
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startrtclock()
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{
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#ifndef SAS
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/*
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* The value 0x3f is magic here- this was a value
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* written by the POST routines in some early SS2
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* boot proms (and possibly IPX as well). The bits
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* that are set are the SIGN bit and 5 bits of
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* calibration value (the maximum).
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*/
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if (clock_type != INTERSIL7170) {
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CLOCK1->clk_ctrl |= CLK_CTRL_WRITE; /* allow writes */
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CLOCK1->clk_ctrl = 0; /* clear it all */
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}
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#endif SAS
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if (hz != 100)
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panic("startrtclock");
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#ifndef SAS
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if (clock_type == INTERSIL7170)
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CLOCK0->clk_intrreg = CLK_INT_HSEC; /* set 1/100 sec clk int */
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else
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/* the counter value is initialized to 1 by the HW and not 0.
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* Therefore the limit should be one more than the computed
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* number. Else we will lose 1us/10ms (bugid 1094383).
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*/
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COUNTER->limit10 =
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(((1000000 / hz) + 1) << CTR_USEC_SHIFT) & CTR_USEC_MASK;
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#endif /* !SAS */
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set_clk_mode(IR_ENA_CLK10, 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 have
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* to be extremely careful that we do it in such a manner that we don't get
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* 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 intreg, dummy;
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register int s;
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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_CLK14 | IR_ENA_CLK10);
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off &= (IR_ENA_CLK14 | IR_ENA_CLK10);
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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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s = spl7();
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intreg = *INTREG & ~(off | IR_ENA_INT);
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/*
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* Next we turns off the CLK10 and CLK14 bits to clear the
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* flip-flops, then we disable clock interrupts. Now we can read the
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* clock's interrupt register to clear any pending signals there.
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*/
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*INTREG &= ~(IR_ENA_CLK14 | IR_ENA_CLK10);
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#ifndef SAS
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if (clock_type == INTERSIL7170) {
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CLOCK0->clk_cmd = (CLK_CMD_NORMAL & ~CLK_CMD_INTRENA);
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dummy = CLOCK0->clk_intrreg; /* clear clock */
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} else {
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dummy = COUNTER->limit10;
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dummy = COUNTER->limit14;
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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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*INTREG |= (intreg | on); /* enable flip-flops */
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#ifndef SAS
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if (clock_type == INTERSIL7170) {
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CLOCK0->clk_cmd = CLK_CMD_NORMAL; /* enable clock intr */
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}
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#endif /* !SAS */
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(void) splx(s);
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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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#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, the overhead is nearly zero.
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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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} else
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todsyncat = 0;
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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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#ifdef SAS
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time.tv_sec = base;
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#else /* !SAS */
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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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#endif /* !SAS */
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}
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/*
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* For Sun-4, we use either the Intersil ICM7170 for both the real time clock
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* and the time-of-day device, or the Mostek MK48T02 for the time-of-day and
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* a separate counter timer service for the real time clock.
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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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CLOCK0->clk_cmd = (CLK_CMD_NORMAL & ~CLK_CMD_RUN);
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CLOCK0->clk_weekday = weekday % 7;
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CLOCK0->clk_year = year;
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CLOCK0->clk_mon = mon;
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CLOCK0->clk_day = day;
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CLOCK0->clk_hour = hour;
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CLOCK0->clk_min = min;
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CLOCK0->clk_sec = sec;
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CLOCK0->clk_hsec = hsec;
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CLOCK0->clk_cmd = CLK_CMD_NORMAL;
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} else {
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CLOCK1->clk_ctrl |= CLK_CTRL_WRITE;
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CLOCK1->clk_sec = btobcd(sec) & CLK_SEC_MASK;
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CLOCK1->clk_min = btobcd(min) & CLK_MIN_MASK;
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CLOCK1->clk_hour = btobcd(hour) & CLK_HOUR_MASK;
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CLOCK1->clk_weekday = btobcd(weekday) & CLK_WEEKDAY_MASK;
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CLOCK1->clk_day = btobcd(day) & CLK_DAY_MASK;
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CLOCK1->clk_month = btobcd(mon) & CLK_MONTH_MASK;
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CLOCK1->clk_year = btobcd(year);
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CLOCK1->clk_ctrl = 0;
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}
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#endif /* !SAS */
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timedelta = 0; /* destroy any time delta */
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(void) splx(s);
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}
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/*
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* Read the current time from the clock chip and convert to UNIX form.
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* Assumes that the year in the counter chip is valid.
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*/
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struct timeval
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todget()
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{
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struct timeval tv;
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u_char now[CLK_WEEKDAY + 1];
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register int i, t = 0;
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register u_char *cp = (u_char *) CLOCK0_ADDR;
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u_short year;
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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; i++) /* read counters */
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now[i] = *cp++;
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} else {
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CLOCK1->clk_ctrl |= CLK_CTRL_READ;
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now[CLK_HSEC] = 0; /* XXX - should look at a counter */
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now[CLK_HOUR] = bcdtob(CLOCK1->clk_hour);
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now[CLK_MIN] = bcdtob(CLOCK1->clk_min);
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now[CLK_SEC] = bcdtob(CLOCK1->clk_sec);
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now[CLK_MON] = bcdtob(CLOCK1->clk_month);
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now[CLK_DAY] = bcdtob(CLOCK1->clk_day);
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now[CLK_YEAR] = bcdtob(CLOCK1->clk_year);
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now[CLK_WEEKDAY] = bcdtob(CLOCK1->clk_weekday);
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CLOCK1->clk_ctrl = 0;
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}
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#endif /* !SAS */
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if (now[CLK_MON] < 1 || now[CLK_MON] > 12 ||
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now[CLK_DAY] < 1 || now[CLK_DAY] > 31 ||
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now[CLK_WEEKDAY] > 7 || now[CLK_HOUR] > 23 ||
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now[CLK_MIN] > 59 || now[CLK_SEC] > 59 ||
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now[CLK_YEAR] < (YRREF - YRBASE)) { /* not initialized */
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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return (tv);
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}
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/*
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* Add the number of seconds for each year onto our time t. We start
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* at YRREF - YRBASE (which is the chip's value for UNIX's YRREF
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* year), and count up to the year value given by the chip, adding
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* each years seconds value to the Unix time value we are
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* calculating.
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*/
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for (year = YRREF - YRBASE; year < now[CLK_YEAR]; year++)
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t += SECYEAR(year);
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/*
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* Now add in the seconds for each month that has gone by this year,
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* adjusting for leap year if appropriate.
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*/
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for (i = 1; i < now[CLK_MON]; i++)
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t += MONTHSEC(i, year);
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t += (now[CLK_DAY] - 1) * SECDAY;
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t += now[CLK_HOUR] * (60 * 60);
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t += now[CLK_MIN] * 60;
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t += now[CLK_SEC];
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/*
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* If t is negative, assume bogus time (year was too large) and use 0
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* seconds. XXX - tv_sec and tv_usec should be unsigned.
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*/
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if (t < 0) {
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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} else {
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tv.tv_sec = t;
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tv.tv_usec = now[CLK_HSEC] * 10000;
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}
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return (tv);
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}
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