diff options
Diffstat (limited to 'sys/isa/atrtc.c')
| -rw-r--r-- | sys/isa/atrtc.c | 970 |
1 files changed, 0 insertions, 970 deletions
diff --git a/sys/isa/atrtc.c b/sys/isa/atrtc.c deleted file mode 100644 index 3570be1..0000000 --- a/sys/isa/atrtc.c +++ /dev/null @@ -1,970 +0,0 @@ -/*- - * Copyright (c) 1990 The Regents of the University of California. - * All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * William Jolitz and Don Ahn. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * from: @(#)clock.c 7.2 (Berkeley) 5/12/91 - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -/* - * Routines to handle clock hardware. - */ - -/* - * inittodr, settodr and support routines written - * by Christoph Robitschko <chmr@edvz.tu-graz.ac.at> - * - * reintroduced and updated by Chris Stenton <chris@gnome.co.uk> 8/10/94 - */ - -#include "opt_apic.h" -#include "opt_clock.h" -#include "opt_isa.h" -#include "opt_mca.h" - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/bus.h> -#include <sys/lock.h> -#include <sys/kdb.h> -#include <sys/mutex.h> -#include <sys/proc.h> -#include <sys/time.h> -#include <sys/timetc.h> -#include <sys/kernel.h> -#include <sys/limits.h> -#include <sys/module.h> -#include <sys/sysctl.h> -#include <sys/cons.h> -#include <sys/power.h> - -#include <machine/clock.h> -#include <machine/cputypes.h> -#include <machine/frame.h> -#include <machine/intr_machdep.h> -#include <machine/md_var.h> -#include <machine/psl.h> -#ifdef DEV_APIC -#include <machine/apicvar.h> -#endif -#include <machine/specialreg.h> -#include <machine/ppireg.h> -#include <machine/timerreg.h> - -#include <isa/rtc.h> -#ifdef DEV_ISA -#include <isa/isareg.h> -#include <isa/isavar.h> -#endif - -#ifdef DEV_MCA -#include <i386/bios/mca_machdep.h> -#endif - -/* - * 32-bit time_t's can't reach leap years before 1904 or after 2036, so we - * can use a simple formula for leap years. - */ -#define LEAPYEAR(y) (((u_int)(y) % 4 == 0) ? 1 : 0) -#define DAYSPERYEAR (31+28+31+30+31+30+31+31+30+31+30+31) - -#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x)) - -int adjkerntz; /* local offset from GMT in seconds */ -int clkintr_pending; -int disable_rtc_set; /* disable resettodr() if != 0 */ -int pscnt = 1; -int psdiv = 1; -int statclock_disable; -#ifndef TIMER_FREQ -#define TIMER_FREQ 1193182 -#endif -u_int timer_freq = TIMER_FREQ; -int timer0_max_count; -int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */ -struct mtx clock_lock; -#define RTC_LOCK mtx_lock_spin(&clock_lock) -#define RTC_UNLOCK mtx_unlock_spin(&clock_lock) - -static int beeping = 0; -static const u_char daysinmonth[] = {31,28,31,30,31,30,31,31,30,31,30,31}; -static u_int hardclock_max_count; -static struct intsrc *i8254_intsrc; -static u_int32_t i8254_lastcount; -static u_int32_t i8254_offset; -static int (*i8254_pending)(struct intsrc *); -static int i8254_ticked; -static int using_lapic_timer; -static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF; -static u_char rtc_statusb = RTCSB_24HR; - -/* Values for timerX_state: */ -#define RELEASED 0 -#define RELEASE_PENDING 1 -#define ACQUIRED 2 -#define ACQUIRE_PENDING 3 - -static u_char timer2_state; - -static unsigned i8254_get_timecount(struct timecounter *tc); -static unsigned i8254_simple_get_timecount(struct timecounter *tc); -static void set_timer_freq(u_int freq, int intr_freq); - -static struct timecounter i8254_timecounter = { - i8254_get_timecount, /* get_timecount */ - 0, /* no poll_pps */ - ~0u, /* counter_mask */ - 0, /* frequency */ - "i8254", /* name */ - 0 /* quality */ -}; - -static void -clkintr(struct clockframe *frame) -{ - - if (timecounter->tc_get_timecount == i8254_get_timecount) { - mtx_lock_spin(&clock_lock); - if (i8254_ticked) - i8254_ticked = 0; - else { - i8254_offset += timer0_max_count; - i8254_lastcount = 0; - } - clkintr_pending = 0; - mtx_unlock_spin(&clock_lock); - } - if (!using_lapic_timer) - hardclock(frame); -#ifdef DEV_MCA - /* Reset clock interrupt by asserting bit 7 of port 0x61 */ - if (MCA_system) - outb(0x61, inb(0x61) | 0x80); -#endif -} - -int -acquire_timer2(int mode) -{ - - if (timer2_state != RELEASED) - return (-1); - timer2_state = ACQUIRED; - - /* - * This access to the timer registers is as atomic as possible - * because it is a single instruction. We could do better if we - * knew the rate. Use of splclock() limits glitches to 10-100us, - * and this is probably good enough for timer2, so we aren't as - * careful with it as with timer0. - */ - outb(TIMER_MODE, TIMER_SEL2 | (mode & 0x3f)); - - return (0); -} - -int -release_timer2() -{ - - if (timer2_state != ACQUIRED) - return (-1); - timer2_state = RELEASED; - outb(TIMER_MODE, TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT); - return (0); -} - -/* - * This routine receives statistical clock interrupts from the RTC. - * As explained above, these occur at 128 interrupts per second. - * When profiling, we receive interrupts at a rate of 1024 Hz. - * - * This does not actually add as much overhead as it sounds, because - * when the statistical clock is active, the hardclock driver no longer - * needs to keep (inaccurate) statistics on its own. This decouples - * statistics gathering from scheduling interrupts. - * - * The RTC chip requires that we read status register C (RTC_INTR) - * to acknowledge an interrupt, before it will generate the next one. - * Under high interrupt load, rtcintr() can be indefinitely delayed and - * the clock can tick immediately after the read from RTC_INTR. In this - * case, the mc146818A interrupt signal will not drop for long enough - * to register with the 8259 PIC. If an interrupt is missed, the stat - * clock will halt, considerably degrading system performance. This is - * why we use 'while' rather than a more straightforward 'if' below. - * Stat clock ticks can still be lost, causing minor loss of accuracy - * in the statistics, but the stat clock will no longer stop. - */ -static void -rtcintr(struct clockframe *frame) -{ - - while (rtcin(RTC_INTR) & RTCIR_PERIOD) { - if (profprocs != 0) { - if (--pscnt == 0) - pscnt = psdiv; - profclock(frame); - } - if (pscnt == psdiv) - statclock(frame); - } -} - -#include "opt_ddb.h" -#ifdef DDB -#include <ddb/ddb.h> - -DB_SHOW_COMMAND(rtc, rtc) -{ - printf("%02x/%02x/%02x %02x:%02x:%02x, A = %02x, B = %02x, C = %02x\n", - rtcin(RTC_YEAR), rtcin(RTC_MONTH), rtcin(RTC_DAY), - rtcin(RTC_HRS), rtcin(RTC_MIN), rtcin(RTC_SEC), - rtcin(RTC_STATUSA), rtcin(RTC_STATUSB), rtcin(RTC_INTR)); -} -#endif /* DDB */ - -static int -getit(void) -{ - int high, low; - - mtx_lock_spin(&clock_lock); - - /* Select timer0 and latch counter value. */ - outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); - - low = inb(TIMER_CNTR0); - high = inb(TIMER_CNTR0); - - mtx_unlock_spin(&clock_lock); - 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 delta, prev_tick, tick, ticks_left; - -#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 - /* - * Guard against the timer being uninitialized if we are called - * early for console i/o. - */ - if (timer0_max_count == 0) - set_timer_freq(timer_freq, hz); - - /* - * 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). - * - * However, if ddb is active then use a fake counter since reading - * the i8254 counter involves acquiring a lock. ddb must not do - * locking for many reasons, but it calls here for at least atkbd - * input. - */ -#ifdef KDB - if (kdb_active) - prev_tick = 1; - else -#endif - prev_tick = getit(); - n -= 0; /* XXX actually guess no initial overhead */ - /* - * Calculate (n * (timer_freq / 1e6)) without using floating point - * and without any avoidable overflows. - */ - if (n <= 0) - ticks_left = 0; - else if (n < 256) - /* - * Use fixed point to avoid a slow division by 1000000. - * 39099 = 1193182 * 2^15 / 10^6 rounded to nearest. - * 2^15 is the first power of 2 that gives exact results - * for n between 0 and 256. - */ - ticks_left = ((u_int)n * 39099 + (1 << 15) - 1) >> 15; - else - /* - * Don't bother using fixed point, although gcc-2.7.2 - * generates particularly poor code for the long long - * division, since even the slow way will complete long - * before the delay is up (unless we're interrupted). - */ - ticks_left = ((u_int)n * (long long)timer_freq + 999999) - / 1000000; - - while (ticks_left > 0) { -#ifdef KDB - if (kdb_active) { - inb(0x84); - tick = prev_tick - 1; - if (tick <= 0) - tick = timer0_max_count; - } else -#endif - tick = getit(); -#ifdef DELAYDEBUG - ++getit_calls; -#endif - delta = prev_tick - tick; - prev_tick = tick; - if (delta < 0) { - delta += timer0_max_count; - /* - * Guard against timer0_max_count being wrong. - * This shouldn't happen in normal operation, - * but it may happen if set_timer_freq() is - * traced. - */ - if (delta < 0) - delta = 0; - } - ticks_left -= delta; - } -#ifdef DELAYDEBUG - if (state == 1) - printf(" %d calls to getit() at %d usec each\n", - getit_calls, (n + 5) / getit_calls); -#endif -} - -static void -sysbeepstop(void *chan) -{ - ppi_spkr_off(); /* disable counter2 output to speaker */ - timer_spkr_release(); - beeping = 0; -} - -int -sysbeep(int pitch, int period) -{ - int x = splclock(); - - if (timer_spkr_acquire()) - if (!beeping) { - /* Something else owns it. */ - splx(x); - return (-1); /* XXX Should be EBUSY, but nobody cares anyway. */ - } - mtx_lock_spin(&clock_lock); - spkr_set_pitch(pitch); - mtx_unlock_spin(&clock_lock); - if (!beeping) { - /* enable counter2 output to speaker */ - ppi_spkr_on(); - beeping = period; - timeout(sysbeepstop, (void *)NULL, period); - } - splx(x); - return (0); -} - -/* - * RTC support routines - */ - -int -rtcin(reg) - int reg; -{ - u_char val; - - RTC_LOCK; - outb(IO_RTC, reg); - inb(0x84); - val = inb(IO_RTC + 1); - inb(0x84); - RTC_UNLOCK; - return (val); -} - -static __inline void -writertc(u_char reg, u_char val) -{ - - RTC_LOCK; - inb(0x84); - outb(IO_RTC, reg); - inb(0x84); - outb(IO_RTC + 1, val); - inb(0x84); /* XXX work around wrong order in rtcin() */ - RTC_UNLOCK; -} - -static __inline int -readrtc(int port) -{ - return(bcd2bin(rtcin(port))); -} - -static u_int -calibrate_clocks(void) -{ - u_int count, prev_count, tot_count; - int sec, start_sec, timeout; - - if (bootverbose) - printf("Calibrating clock(s) ... "); - if (!(rtcin(RTC_STATUSD) & RTCSD_PWR)) - goto fail; - timeout = 100000000; - - /* Read the mc146818A seconds counter. */ - for (;;) { - if (!(rtcin(RTC_STATUSA) & RTCSA_TUP)) { - sec = rtcin(RTC_SEC); - break; - } - if (--timeout == 0) - goto fail; - } - - /* Wait for the mC146818A seconds counter to change. */ - start_sec = sec; - for (;;) { - if (!(rtcin(RTC_STATUSA) & RTCSA_TUP)) { - sec = rtcin(RTC_SEC); - if (sec != start_sec) - break; - } - if (--timeout == 0) - goto fail; - } - - /* Start keeping track of the i8254 counter. */ - prev_count = getit(); - if (prev_count == 0 || prev_count > timer0_max_count) - goto fail; - tot_count = 0; - - /* - * Wait for the mc146818A seconds counter to change. Read the i8254 - * counter for each iteration since this is convenient and only - * costs a few usec of inaccuracy. The timing of the final reads - * of the counters almost matches the timing of the initial reads, - * so the main cause of inaccuracy is the varying latency from - * inside getit() or rtcin(RTC_STATUSA) to the beginning of the - * rtcin(RTC_SEC) that returns a changed seconds count. The - * maximum inaccuracy from this cause is < 10 usec on 486's. - */ - start_sec = sec; - for (;;) { - if (!(rtcin(RTC_STATUSA) & RTCSA_TUP)) - sec = rtcin(RTC_SEC); - count = getit(); - if (count == 0 || count > timer0_max_count) - goto fail; - if (count > prev_count) - tot_count += prev_count - (count - timer0_max_count); - else - tot_count += prev_count - count; - prev_count = count; - if (sec != start_sec) - break; - if (--timeout == 0) - goto fail; - } - - if (bootverbose) { - printf("i8254 clock: %u Hz\n", tot_count); - } - return (tot_count); - -fail: - if (bootverbose) - printf("failed, using default i8254 clock of %u Hz\n", - timer_freq); - return (timer_freq); -} - -static void -set_timer_freq(u_int freq, int intr_freq) -{ - int new_timer0_max_count; - - i8254_timecounter.tc_frequency = freq; - mtx_lock_spin(&clock_lock); - timer_freq = freq; - new_timer0_max_count = hardclock_max_count = TIMER_DIV(intr_freq); - if (using_lapic_timer) { - outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); - outb(TIMER_CNTR0, 0); - outb(TIMER_CNTR0, 0); - } else if (new_timer0_max_count != timer0_max_count) { - timer0_max_count = new_timer0_max_count; - outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); - outb(TIMER_CNTR0, timer0_max_count & 0xff); - outb(TIMER_CNTR0, timer0_max_count >> 8); - } - mtx_unlock_spin(&clock_lock); -} - -static void -i8254_restore(void) -{ - - set_timer_freq(timer_freq, hz); -} - -static void -rtc_restore(void) -{ - - /* Restore all of the RTC's "status" (actually, control) registers. */ - /* XXX locking is needed for RTC access. */ - writertc(RTC_STATUSB, RTCSB_24HR); - writertc(RTC_STATUSA, rtc_statusa); - writertc(RTC_STATUSB, rtc_statusb); - rtcin(RTC_INTR); -} - -/* - * Restore all the timers non-atomically (XXX: should be atomically). - * - * This function is called from pmtimer_resume() to restore all the timers. - * This should not be necessary, but there are broken laptops that do not - * restore all the timers on resume. - */ -void -timer_restore(void) -{ - - i8254_restore(); /* restore timer_freq and hz */ - rtc_restore(); /* reenable RTC interrupts */ -} - -/* - * Initialize 8254 timer 0 early so that it can be used in DELAY(). - * XXX initialization of other timers is unintentionally left blank. - */ -void -startrtclock() -{ - u_int delta, freq; - - writertc(RTC_STATUSA, rtc_statusa); - writertc(RTC_STATUSB, RTCSB_24HR); - - set_timer_freq(timer_freq, hz); - freq = calibrate_clocks(); -#ifdef CLK_CALIBRATION_LOOP - if (bootverbose) { - printf( - "Press a key on the console to abort clock calibration\n"); - while (cncheckc() == -1) - calibrate_clocks(); - } -#endif - - /* - * Use the calibrated i8254 frequency if it seems reasonable. - * Otherwise use the default, and don't use the calibrated i586 - * frequency. - */ - delta = freq > timer_freq ? freq - timer_freq : timer_freq - freq; - if (delta < timer_freq / 100) { -#ifndef CLK_USE_I8254_CALIBRATION - if (bootverbose) - printf( -"CLK_USE_I8254_CALIBRATION not specified - using default frequency\n"); - freq = timer_freq; -#endif - timer_freq = freq; - } else { - if (bootverbose) - printf( - "%d Hz differs from default of %d Hz by more than 1%%\n", - freq, timer_freq); - } - - set_timer_freq(timer_freq, hz); - tc_init(&i8254_timecounter); - - init_TSC(); -} - -/* - * Initialize the time of day register, based on the time base which is, e.g. - * from a filesystem. - */ -void -inittodr(time_t base) -{ - unsigned long sec, days; - int year, month; - int y, m, s; - struct timespec ts; - - if (base) { - s = splclock(); - ts.tv_sec = base; - ts.tv_nsec = 0; - tc_setclock(&ts); - splx(s); - } - - /* Look if we have a RTC present and the time is valid */ - if (!(rtcin(RTC_STATUSD) & RTCSD_PWR)) - goto wrong_time; - - /* wait for time update to complete */ - /* If RTCSA_TUP is zero, we have at least 244us before next update */ - s = splhigh(); - while (rtcin(RTC_STATUSA) & RTCSA_TUP) { - splx(s); - s = splhigh(); - } - - days = 0; -#ifdef USE_RTC_CENTURY - year = readrtc(RTC_YEAR) + readrtc(RTC_CENTURY) * 100; -#else - year = readrtc(RTC_YEAR) + 1900; - if (year < 1970) - year += 100; -#endif - if (year < 1970) { - splx(s); - goto wrong_time; - } - month = readrtc(RTC_MONTH); - for (m = 1; m < month; m++) - days += daysinmonth[m-1]; - if ((month > 2) && LEAPYEAR(year)) - days ++; - days += readrtc(RTC_DAY) - 1; - for (y = 1970; y < year; y++) - days += DAYSPERYEAR + LEAPYEAR(y); - sec = ((( days * 24 + - readrtc(RTC_HRS)) * 60 + - readrtc(RTC_MIN)) * 60 + - readrtc(RTC_SEC)); - /* sec now contains the number of seconds, since Jan 1 1970, - in the local time zone */ - - sec += tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); - - y = time_second - sec; - if (y <= -2 || y >= 2) { - /* badly off, adjust it */ - ts.tv_sec = sec; - ts.tv_nsec = 0; - tc_setclock(&ts); - } - splx(s); - return; - -wrong_time: - printf("Invalid time in real time clock.\n"); - printf("Check and reset the date immediately!\n"); -} - -/* - * Write system time back to RTC - */ -void -resettodr() -{ - unsigned long tm; - int y, m, s; - - if (disable_rtc_set) - return; - - s = splclock(); - tm = time_second; - splx(s); - - /* Disable RTC updates and interrupts. */ - writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR); - - /* Calculate local time to put in RTC */ - - tm -= tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); - - writertc(RTC_SEC, bin2bcd(tm%60)); tm /= 60; /* Write back Seconds */ - writertc(RTC_MIN, bin2bcd(tm%60)); tm /= 60; /* Write back Minutes */ - writertc(RTC_HRS, bin2bcd(tm%24)); tm /= 24; /* Write back Hours */ - - /* We have now the days since 01-01-1970 in tm */ - writertc(RTC_WDAY, (tm + 4) % 7 + 1); /* Write back Weekday */ - for (y = 1970, m = DAYSPERYEAR + LEAPYEAR(y); - tm >= m; - y++, m = DAYSPERYEAR + LEAPYEAR(y)) - tm -= m; - - /* Now we have the years in y and the day-of-the-year in tm */ - writertc(RTC_YEAR, bin2bcd(y%100)); /* Write back Year */ -#ifdef USE_RTC_CENTURY - writertc(RTC_CENTURY, bin2bcd(y/100)); /* ... and Century */ -#endif - for (m = 0; ; m++) { - int ml; - - ml = daysinmonth[m]; - if (m == 1 && LEAPYEAR(y)) - ml++; - if (tm < ml) - break; - tm -= ml; - } - - writertc(RTC_MONTH, bin2bcd(m + 1)); /* Write back Month */ - writertc(RTC_DAY, bin2bcd(tm + 1)); /* Write back Month Day */ - - /* Reenable RTC updates and interrupts. */ - writertc(RTC_STATUSB, rtc_statusb); - rtcin(RTC_INTR); -} - - -/* - * Start both clocks running. - */ -void -cpu_initclocks() -{ - int diag; - -#ifdef DEV_APIC - using_lapic_timer = lapic_setup_clock(); -#endif - /* - * If we aren't using the local APIC timer to drive the kernel - * clocks, setup the interrupt handler for the 8254 timer 0 so - * that it can drive hardclock(). Otherwise, change the 8254 - * timecounter to user a simpler algorithm. - */ - if (!using_lapic_timer) { - intr_add_handler("clk", 0, (driver_intr_t *)clkintr, NULL, - INTR_TYPE_CLK | INTR_FAST, NULL); - i8254_intsrc = intr_lookup_source(0); - if (i8254_intsrc != NULL) - i8254_pending = - i8254_intsrc->is_pic->pic_source_pending; - } else { - i8254_timecounter.tc_get_timecount = - i8254_simple_get_timecount; - i8254_timecounter.tc_counter_mask = 0xffff; - set_timer_freq(timer_freq, hz); - } - - /* Initialize RTC. */ - writertc(RTC_STATUSA, rtc_statusa); - writertc(RTC_STATUSB, RTCSB_24HR); - - /* - * If the separate statistics clock hasn't been explicility disabled - * and we aren't already using the local APIC timer to drive the - * kernel clocks, then setup the RTC to periodically interrupt to - * drive statclock() and profclock(). - */ - if (!statclock_disable && !using_lapic_timer) { - diag = rtcin(RTC_DIAG); - if (diag != 0) - printf("RTC BIOS diagnostic error %b\n", diag, RTCDG_BITS); - - /* Setting stathz to nonzero early helps avoid races. */ - stathz = RTC_NOPROFRATE; - profhz = RTC_PROFRATE; - - /* Enable periodic interrupts from the RTC. */ - rtc_statusb |= RTCSB_PINTR; - intr_add_handler("rtc", 8, (driver_intr_t *)rtcintr, NULL, - INTR_TYPE_CLK | INTR_FAST, NULL); - - writertc(RTC_STATUSB, rtc_statusb); - rtcin(RTC_INTR); - } - - init_TSC_tc(); -} - -void -cpu_startprofclock(void) -{ - - if (using_lapic_timer) - return; - rtc_statusa = RTCSA_DIVIDER | RTCSA_PROF; - writertc(RTC_STATUSA, rtc_statusa); - psdiv = pscnt = psratio; -} - -void -cpu_stopprofclock(void) -{ - - if (using_lapic_timer) - return; - rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF; - writertc(RTC_STATUSA, rtc_statusa); - psdiv = pscnt = 1; -} - -static int -sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS) -{ - int error; - u_int freq; - - /* - * Use `i8254' instead of `timer' in external names because `timer' - * is is too generic. Should use it everywhere. - */ - freq = timer_freq; - error = sysctl_handle_int(oidp, &freq, sizeof(freq), req); - if (error == 0 && req->newptr != NULL) - set_timer_freq(freq, hz); - return (error); -} - -SYSCTL_PROC(_machdep, OID_AUTO, i8254_freq, CTLTYPE_INT | CTLFLAG_RW, - 0, sizeof(u_int), sysctl_machdep_i8254_freq, "IU", ""); - -static unsigned -i8254_simple_get_timecount(struct timecounter *tc) -{ - u_int count; - u_int high, low; - - mtx_lock_spin(&clock_lock); - - /* Select timer0 and latch counter value. */ - outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); - - low = inb(TIMER_CNTR0); - high = inb(TIMER_CNTR0); - count = 0xffff - ((high << 8) | low); - mtx_unlock_spin(&clock_lock); - return (count); -} - -static unsigned -i8254_get_timecount(struct timecounter *tc) -{ - u_int count; - u_int high, low; - u_int eflags; - - eflags = read_eflags(); - mtx_lock_spin(&clock_lock); - - /* Select timer0 and latch counter value. */ - outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); - - low = inb(TIMER_CNTR0); - high = inb(TIMER_CNTR0); - count = timer0_max_count - ((high << 8) | low); - if (count < i8254_lastcount || - (!i8254_ticked && (clkintr_pending || - ((count < 20 || (!(eflags & PSL_I) && count < timer0_max_count / 2u)) && - i8254_pending != NULL && i8254_pending(i8254_intsrc))))) { - i8254_ticked = 1; - i8254_offset += timer0_max_count; - } - i8254_lastcount = count; - count += i8254_offset; - mtx_unlock_spin(&clock_lock); - return (count); -} - -#ifdef DEV_ISA -/* - * Attach to the ISA PnP descriptors for the timer and realtime clock. - */ -static struct isa_pnp_id attimer_ids[] = { - { 0x0001d041 /* PNP0100 */, "AT timer" }, - { 0x000bd041 /* PNP0B00 */, "AT realtime clock" }, - { 0 } -}; - -static int -attimer_probe(device_t dev) -{ - int result; - - if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, attimer_ids)) <= 0) - device_quiet(dev); - return(result); -} - -static int -attimer_attach(device_t dev) -{ - return(0); -} - -static device_method_t attimer_methods[] = { - /* Device interface */ - DEVMETHOD(device_probe, attimer_probe), - DEVMETHOD(device_attach, attimer_attach), - DEVMETHOD(device_detach, bus_generic_detach), - DEVMETHOD(device_shutdown, bus_generic_shutdown), - DEVMETHOD(device_suspend, bus_generic_suspend), /* XXX stop statclock? */ - DEVMETHOD(device_resume, bus_generic_resume), /* XXX restart statclock? */ - { 0, 0 } -}; - -static driver_t attimer_driver = { - "attimer", - attimer_methods, - 1, /* no softc */ -}; - -static devclass_t attimer_devclass; - -DRIVER_MODULE(attimer, isa, attimer_driver, attimer_devclass, 0, 0); -DRIVER_MODULE(attimer, acpi, attimer_driver, attimer_devclass, 0, 0); -#endif /* DEV_ISA */ |
