- Remove the BURN_BRIDGES marked support for hooking into the ISA timer 0
interrupt. - Remove the timer_func variable as it now has a static value of hardclock() and is only used in one place. Axe borrowed from: phk
This commit is contained in:
jhb
parent
291aff4a04
commit
35e48efc22
@ -39,10 +39,6 @@ int rtcin(int val);
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int acquire_timer1(int mode);
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int release_timer1(void);
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#endif
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#ifndef BURN_BRIDGES
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int acquire_timer0(int rate, void (*function)(struct clockframe *frame));
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int release_timer0(void);
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#endif
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int sysbeep(int pitch, int period);
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void timer_restore(void);
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void init_TSC(void);
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@ -98,23 +98,6 @@ __FBSDID("$FreeBSD$");
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#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x))
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#ifndef BURN_BRIDGES
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/*
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* Time in timer cycles that it takes for microtime() to disable interrupts
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* and latch the count. microtime() currently uses "cli; outb ..." so it
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* normally takes less than 2 timer cycles. Add a few for cache misses.
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* Add a few more to allow for latency in bogus calls to microtime() with
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* interrupts already disabled.
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*/
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#define TIMER0_LATCH_COUNT 20
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/*
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* Maximum frequency that we are willing to allow for timer0. Must be
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* low enough to guarantee that the timer interrupt handler returns
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* before the next timer interrupt.
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*/
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#define TIMER0_MAX_FREQ 20000
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#endif
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int adjkerntz; /* local offset from GMT in seconds */
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int clkintr_pending;
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@ -139,18 +122,6 @@ static u_int32_t i8254_offset;
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static int (*i8254_pending)(struct intsrc *);
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static int i8254_ticked;
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static int using_lapic_timer;
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#ifndef BURN_BRIDGES
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/*
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* XXX new_function and timer_func should not handle clockframes, but
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* timer_func currently needs to hold hardclock to handle the
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* timer0_state == 0 case. We should use inthand_add()/inthand_remove()
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* to switch between clkintr() and a slightly different timerintr().
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*/
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static void (*new_function)(struct clockframe *frame);
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static u_int new_rate;
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static u_int timer0_prescaler_count;
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static u_char timer0_state;
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#endif
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static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
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static u_char rtc_statusb = RTCSB_24HR | RTCSB_PINTR;
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@ -161,7 +132,6 @@ static u_char rtc_statusb = RTCSB_24HR | RTCSB_PINTR;
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#define ACQUIRE_PENDING 3
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static u_char timer2_state;
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static void (*timer_func)(struct clockframe *frame) = hardclock;
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static unsigned i8254_get_timecount(struct timecounter *tc);
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static void set_timer_freq(u_int freq, int intr_freq);
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@ -190,58 +160,8 @@ clkintr(struct clockframe *frame)
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clkintr_pending = 0;
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mtx_unlock_spin(&clock_lock);
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}
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if (timer_func != hardclock || !using_lapic_timer)
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timer_func(frame);
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#ifndef BURN_BRIDGES
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switch (timer0_state) {
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case RELEASED:
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break;
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case ACQUIRED:
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if (using_lapic_timer)
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break;
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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timer0_prescaler_count -= hardclock_max_count;
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hardclock(frame);
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}
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break;
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case ACQUIRE_PENDING:
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mtx_lock_spin(&clock_lock);
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i8254_offset = i8254_get_timecount(NULL);
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i8254_lastcount = 0;
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timer0_max_count = TIMER_DIV(new_rate);
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outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
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outb(TIMER_CNTR0, timer0_max_count & 0xff);
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outb(TIMER_CNTR0, timer0_max_count >> 8);
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mtx_unlock_spin(&clock_lock);
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timer_func = new_function;
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timer0_state = ACQUIRED;
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break;
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case RELEASE_PENDING:
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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mtx_lock_spin(&clock_lock);
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i8254_offset = i8254_get_timecount(NULL);
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i8254_lastcount = 0;
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timer0_max_count = hardclock_max_count;
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outb(TIMER_MODE,
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TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
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outb(TIMER_CNTR0, timer0_max_count & 0xff);
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outb(TIMER_CNTR0, timer0_max_count >> 8);
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mtx_unlock_spin(&clock_lock);
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timer0_prescaler_count = 0;
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timer_func = hardclock;
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timer0_state = RELEASED;
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if (!using_lapic_timer)
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hardclock(frame);
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}
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break;
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}
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#endif
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if (!using_lapic_timer)
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hardclock(frame);
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#ifdef DEV_MCA
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/* Reset clock interrupt by asserting bit 7 of port 0x61 */
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if (MCA_system)
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@ -249,43 +169,6 @@ clkintr(struct clockframe *frame)
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#endif
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}
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#ifndef BURN_BRIDGES
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/*
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* The acquire and release functions must be called at ipl >= splclock().
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*/
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int
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acquire_timer0(int rate, void (*function)(struct clockframe *frame))
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{
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static int old_rate;
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if (rate <= 0 || rate > TIMER0_MAX_FREQ)
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return (-1);
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switch (timer0_state) {
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case RELEASED:
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timer0_state = ACQUIRE_PENDING;
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break;
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case RELEASE_PENDING:
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if (rate != old_rate)
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return (-1);
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/*
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* The timer has been released recently, but is being
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* re-acquired before the release completed. In this
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* case, we simply reclaim it as if it had not been
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* released at all.
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*/
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timer0_state = ACQUIRED;
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break;
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default:
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return (-1); /* busy */
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}
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new_function = function;
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old_rate = new_rate = rate;
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return (0);
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}
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#endif
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int
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acquire_timer2(int mode)
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@ -307,27 +190,6 @@ acquire_timer2(int mode)
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return (0);
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}
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#ifndef BURN_BRIDGES
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int
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release_timer0()
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{
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switch (timer0_state) {
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case ACQUIRED:
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timer0_state = RELEASE_PENDING;
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break;
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case ACQUIRE_PENDING:
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/* Nothing happened yet, release quickly. */
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timer0_state = RELEASED;
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break;
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default:
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return (-1);
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}
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return (0);
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}
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#endif
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int
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release_timer2()
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@ -996,10 +858,6 @@ sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS)
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freq = timer_freq;
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error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
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if (error == 0 && req->newptr != NULL) {
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#ifndef BURN_BRIDGES
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if (timer0_state != RELEASED)
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return (EBUSY); /* too much trouble to handle */
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#endif
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set_timer_freq(freq, hz);
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i8254_timecounter.tc_frequency = freq;
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}
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146
sys/isa/atrtc.c
146
sys/isa/atrtc.c
@ -98,23 +98,6 @@ __FBSDID("$FreeBSD$");
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#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x))
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#ifndef BURN_BRIDGES
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/*
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* Time in timer cycles that it takes for microtime() to disable interrupts
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* and latch the count. microtime() currently uses "cli; outb ..." so it
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* normally takes less than 2 timer cycles. Add a few for cache misses.
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* Add a few more to allow for latency in bogus calls to microtime() with
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* interrupts already disabled.
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*/
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#define TIMER0_LATCH_COUNT 20
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/*
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* Maximum frequency that we are willing to allow for timer0. Must be
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* low enough to guarantee that the timer interrupt handler returns
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* before the next timer interrupt.
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*/
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#define TIMER0_MAX_FREQ 20000
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#endif
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int adjkerntz; /* local offset from GMT in seconds */
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int clkintr_pending;
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@ -139,18 +122,6 @@ static u_int32_t i8254_offset;
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static int (*i8254_pending)(struct intsrc *);
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static int i8254_ticked;
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static int using_lapic_timer;
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#ifndef BURN_BRIDGES
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/*
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* XXX new_function and timer_func should not handle clockframes, but
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* timer_func currently needs to hold hardclock to handle the
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* timer0_state == 0 case. We should use inthand_add()/inthand_remove()
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* to switch between clkintr() and a slightly different timerintr().
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*/
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static void (*new_function)(struct clockframe *frame);
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static u_int new_rate;
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static u_int timer0_prescaler_count;
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static u_char timer0_state;
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#endif
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static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
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static u_char rtc_statusb = RTCSB_24HR | RTCSB_PINTR;
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@ -161,7 +132,6 @@ static u_char rtc_statusb = RTCSB_24HR | RTCSB_PINTR;
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#define ACQUIRE_PENDING 3
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static u_char timer2_state;
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static void (*timer_func)(struct clockframe *frame) = hardclock;
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static unsigned i8254_get_timecount(struct timecounter *tc);
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static void set_timer_freq(u_int freq, int intr_freq);
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@ -190,58 +160,8 @@ clkintr(struct clockframe *frame)
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clkintr_pending = 0;
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mtx_unlock_spin(&clock_lock);
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}
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if (timer_func != hardclock || !using_lapic_timer)
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timer_func(frame);
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#ifndef BURN_BRIDGES
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switch (timer0_state) {
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case RELEASED:
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break;
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case ACQUIRED:
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if (using_lapic_timer)
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break;
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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timer0_prescaler_count -= hardclock_max_count;
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hardclock(frame);
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}
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break;
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case ACQUIRE_PENDING:
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mtx_lock_spin(&clock_lock);
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i8254_offset = i8254_get_timecount(NULL);
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i8254_lastcount = 0;
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timer0_max_count = TIMER_DIV(new_rate);
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outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
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outb(TIMER_CNTR0, timer0_max_count & 0xff);
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outb(TIMER_CNTR0, timer0_max_count >> 8);
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mtx_unlock_spin(&clock_lock);
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timer_func = new_function;
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timer0_state = ACQUIRED;
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break;
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case RELEASE_PENDING:
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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mtx_lock_spin(&clock_lock);
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i8254_offset = i8254_get_timecount(NULL);
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i8254_lastcount = 0;
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timer0_max_count = hardclock_max_count;
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outb(TIMER_MODE,
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TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
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outb(TIMER_CNTR0, timer0_max_count & 0xff);
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outb(TIMER_CNTR0, timer0_max_count >> 8);
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mtx_unlock_spin(&clock_lock);
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timer0_prescaler_count = 0;
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timer_func = hardclock;
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timer0_state = RELEASED;
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if (!using_lapic_timer)
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hardclock(frame);
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}
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break;
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}
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#endif
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if (!using_lapic_timer)
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hardclock(frame);
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#ifdef DEV_MCA
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/* Reset clock interrupt by asserting bit 7 of port 0x61 */
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if (MCA_system)
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@ -249,43 +169,6 @@ clkintr(struct clockframe *frame)
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#endif
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}
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#ifndef BURN_BRIDGES
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/*
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* The acquire and release functions must be called at ipl >= splclock().
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*/
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int
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acquire_timer0(int rate, void (*function)(struct clockframe *frame))
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{
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static int old_rate;
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if (rate <= 0 || rate > TIMER0_MAX_FREQ)
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return (-1);
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switch (timer0_state) {
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case RELEASED:
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timer0_state = ACQUIRE_PENDING;
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break;
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case RELEASE_PENDING:
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if (rate != old_rate)
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return (-1);
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/*
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* The timer has been released recently, but is being
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* re-acquired before the release completed. In this
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* case, we simply reclaim it as if it had not been
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* released at all.
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*/
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timer0_state = ACQUIRED;
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break;
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default:
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return (-1); /* busy */
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}
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new_function = function;
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old_rate = new_rate = rate;
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return (0);
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}
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#endif
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int
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acquire_timer2(int mode)
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@ -307,27 +190,6 @@ acquire_timer2(int mode)
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return (0);
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}
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#ifndef BURN_BRIDGES
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int
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release_timer0()
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{
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switch (timer0_state) {
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case ACQUIRED:
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timer0_state = RELEASE_PENDING;
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break;
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case ACQUIRE_PENDING:
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/* Nothing happened yet, release quickly. */
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timer0_state = RELEASED;
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break;
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default:
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return (-1);
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}
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return (0);
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}
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#endif
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int
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release_timer2()
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@ -996,10 +858,6 @@ sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS)
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freq = timer_freq;
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error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
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if (error == 0 && req->newptr != NULL) {
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#ifndef BURN_BRIDGES
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if (timer0_state != RELEASED)
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return (EBUSY); /* too much trouble to handle */
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#endif
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set_timer_freq(freq, hz);
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i8254_timecounter.tc_frequency = freq;
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}
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@ -97,23 +97,6 @@
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#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x))
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#ifndef BURN_BRIDGES
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/*
|
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* Time in timer cycles that it takes for microtime() to disable interrupts
|
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* and latch the count. microtime() currently uses "cli; outb ..." so it
|
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* normally takes less than 2 timer cycles. Add a few for cache misses.
|
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* Add a few more to allow for latency in bogus calls to microtime() with
|
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* interrupts already disabled.
|
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*/
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#define TIMER0_LATCH_COUNT 20
|
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|
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/*
|
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* Maximum frequency that we are willing to allow for timer0. Must be
|
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* low enough to guarantee that the timer interrupt handler returns
|
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* before the next timer interrupt.
|
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*/
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#define TIMER0_MAX_FREQ 20000
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#endif
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int adjkerntz; /* local offset from GMT in seconds */
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int clkintr_pending;
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@ -137,18 +120,6 @@ static u_int32_t i8254_offset;
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static int i8254_ticked;
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static int using_lapic_timer;
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static struct intsrc *i8254_intsrc;
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#ifndef BURN_BRIDGES
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/*
|
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* XXX new_function and timer_func should not handle clockframes, but
|
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* timer_func currently needs to hold hardclock to handle the
|
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* timer0_state == 0 case. We should use inthand_add()/inthand_remove()
|
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* to switch between clkintr() and a slightly different timerintr().
|
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*/
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static void (*new_function)(struct clockframe *frame);
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static u_int new_rate;
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static u_int timer0_prescaler_count;
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static u_char timer0_state;
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#endif
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/* Values for timerX_state: */
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#define RELEASED 0
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@ -158,7 +129,6 @@ static u_char timer0_state;
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static u_char timer1_state;
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static u_char timer2_state;
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static void (*timer_func)(struct clockframe *frame) = hardclock;
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static void rtc_serialcombit(int);
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static void rtc_serialcom(int);
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static int rtc_inb(void);
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@ -191,97 +161,10 @@ clkintr(struct clockframe *frame)
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clkintr_pending = 0;
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mtx_unlock_spin(&clock_lock);
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}
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if (timer_func != hardclock || !using_lapic_timer)
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timer_func(frame);
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#ifndef BURN_BRIDGES
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switch (timer0_state) {
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case RELEASED:
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break;
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case ACQUIRED:
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if (using_lapic_timer)
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break;
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if ((timer0_prescaler_count += timer0_max_count)
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>= hardclock_max_count) {
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timer0_prescaler_count -= hardclock_max_count;
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hardclock(frame);
|
||||
}
|
||||
break;
|
||||
|
||||
case ACQUIRE_PENDING:
|
||||
mtx_lock_spin(&clock_lock);
|
||||
i8254_offset = i8254_get_timecount(NULL);
|
||||
i8254_lastcount = 0;
|
||||
timer0_max_count = TIMER_DIV(new_rate);
|
||||
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);
|
||||
timer_func = new_function;
|
||||
timer0_state = ACQUIRED;
|
||||
break;
|
||||
|
||||
case RELEASE_PENDING:
|
||||
if ((timer0_prescaler_count += timer0_max_count)
|
||||
>= hardclock_max_count) {
|
||||
mtx_lock_spin(&clock_lock);
|
||||
i8254_offset = i8254_get_timecount(NULL);
|
||||
i8254_lastcount = 0;
|
||||
timer0_max_count = hardclock_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);
|
||||
timer0_prescaler_count = 0;
|
||||
timer_func = hardclock;
|
||||
timer0_state = RELEASED;
|
||||
if (!using_lapic_timer)
|
||||
hardclock(frame);
|
||||
}
|
||||
break;
|
||||
}
|
||||
#endif
|
||||
if (!using_lapic_timer)
|
||||
hardclock(frame);
|
||||
}
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
/*
|
||||
* The acquire and release functions must be called at ipl >= splclock().
|
||||
*/
|
||||
int
|
||||
acquire_timer0(int rate, void (*function)(struct clockframe *frame))
|
||||
{
|
||||
static int old_rate;
|
||||
|
||||
if (rate <= 0 || rate > TIMER0_MAX_FREQ)
|
||||
return (-1);
|
||||
switch (timer0_state) {
|
||||
|
||||
case RELEASED:
|
||||
timer0_state = ACQUIRE_PENDING;
|
||||
break;
|
||||
|
||||
case RELEASE_PENDING:
|
||||
if (rate != old_rate)
|
||||
return (-1);
|
||||
/*
|
||||
* The timer has been released recently, but is being
|
||||
* re-acquired before the release completed. In this
|
||||
* case, we simply reclaim it as if it had not been
|
||||
* released at all.
|
||||
*/
|
||||
timer0_state = ACQUIRED;
|
||||
break;
|
||||
|
||||
default:
|
||||
return (-1); /* busy */
|
||||
}
|
||||
new_function = function;
|
||||
old_rate = new_rate = rate;
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
|
||||
int
|
||||
acquire_timer1(int mode)
|
||||
@ -323,27 +206,6 @@ acquire_timer2(int mode)
|
||||
return (0);
|
||||
}
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
int
|
||||
release_timer0()
|
||||
{
|
||||
switch (timer0_state) {
|
||||
|
||||
case ACQUIRED:
|
||||
timer0_state = RELEASE_PENDING;
|
||||
break;
|
||||
|
||||
case ACQUIRE_PENDING:
|
||||
/* Nothing happened yet, release quickly. */
|
||||
timer0_state = RELEASED;
|
||||
break;
|
||||
|
||||
default:
|
||||
return (-1);
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
|
||||
int
|
||||
release_timer1()
|
||||
@ -929,10 +791,6 @@ sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS)
|
||||
freq = timer_freq;
|
||||
error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
|
||||
if (error == 0 && req->newptr != NULL) {
|
||||
#ifndef BURN_BRIDGES
|
||||
if (timer0_state != RELEASED)
|
||||
return (EBUSY); /* too much trouble to handle */
|
||||
#endif
|
||||
set_timer_freq(freq, hz);
|
||||
i8254_timecounter.tc_frequency = freq;
|
||||
}
|
||||
|
||||
@ -97,23 +97,6 @@
|
||||
|
||||
#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x))
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
/*
|
||||
* Time in timer cycles that it takes for microtime() to disable interrupts
|
||||
* and latch the count. microtime() currently uses "cli; outb ..." so it
|
||||
* normally takes less than 2 timer cycles. Add a few for cache misses.
|
||||
* Add a few more to allow for latency in bogus calls to microtime() with
|
||||
* interrupts already disabled.
|
||||
*/
|
||||
#define TIMER0_LATCH_COUNT 20
|
||||
|
||||
/*
|
||||
* Maximum frequency that we are willing to allow for timer0. Must be
|
||||
* low enough to guarantee that the timer interrupt handler returns
|
||||
* before the next timer interrupt.
|
||||
*/
|
||||
#define TIMER0_MAX_FREQ 20000
|
||||
#endif
|
||||
|
||||
int adjkerntz; /* local offset from GMT in seconds */
|
||||
int clkintr_pending;
|
||||
@ -137,18 +120,6 @@ static u_int32_t i8254_offset;
|
||||
static int i8254_ticked;
|
||||
static int using_lapic_timer;
|
||||
static struct intsrc *i8254_intsrc;
|
||||
#ifndef BURN_BRIDGES
|
||||
/*
|
||||
* XXX new_function and timer_func should not handle clockframes, but
|
||||
* timer_func currently needs to hold hardclock to handle the
|
||||
* timer0_state == 0 case. We should use inthand_add()/inthand_remove()
|
||||
* to switch between clkintr() and a slightly different timerintr().
|
||||
*/
|
||||
static void (*new_function)(struct clockframe *frame);
|
||||
static u_int new_rate;
|
||||
static u_int timer0_prescaler_count;
|
||||
static u_char timer0_state;
|
||||
#endif
|
||||
|
||||
/* Values for timerX_state: */
|
||||
#define RELEASED 0
|
||||
@ -158,7 +129,6 @@ static u_char timer0_state;
|
||||
|
||||
static u_char timer1_state;
|
||||
static u_char timer2_state;
|
||||
static void (*timer_func)(struct clockframe *frame) = hardclock;
|
||||
static void rtc_serialcombit(int);
|
||||
static void rtc_serialcom(int);
|
||||
static int rtc_inb(void);
|
||||
@ -191,97 +161,10 @@ clkintr(struct clockframe *frame)
|
||||
clkintr_pending = 0;
|
||||
mtx_unlock_spin(&clock_lock);
|
||||
}
|
||||
if (timer_func != hardclock || !using_lapic_timer)
|
||||
timer_func(frame);
|
||||
#ifndef BURN_BRIDGES
|
||||
switch (timer0_state) {
|
||||
|
||||
case RELEASED:
|
||||
break;
|
||||
|
||||
case ACQUIRED:
|
||||
if (using_lapic_timer)
|
||||
break;
|
||||
if ((timer0_prescaler_count += timer0_max_count)
|
||||
>= hardclock_max_count) {
|
||||
timer0_prescaler_count -= hardclock_max_count;
|
||||
hardclock(frame);
|
||||
}
|
||||
break;
|
||||
|
||||
case ACQUIRE_PENDING:
|
||||
mtx_lock_spin(&clock_lock);
|
||||
i8254_offset = i8254_get_timecount(NULL);
|
||||
i8254_lastcount = 0;
|
||||
timer0_max_count = TIMER_DIV(new_rate);
|
||||
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);
|
||||
timer_func = new_function;
|
||||
timer0_state = ACQUIRED;
|
||||
break;
|
||||
|
||||
case RELEASE_PENDING:
|
||||
if ((timer0_prescaler_count += timer0_max_count)
|
||||
>= hardclock_max_count) {
|
||||
mtx_lock_spin(&clock_lock);
|
||||
i8254_offset = i8254_get_timecount(NULL);
|
||||
i8254_lastcount = 0;
|
||||
timer0_max_count = hardclock_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);
|
||||
timer0_prescaler_count = 0;
|
||||
timer_func = hardclock;
|
||||
timer0_state = RELEASED;
|
||||
if (!using_lapic_timer)
|
||||
hardclock(frame);
|
||||
}
|
||||
break;
|
||||
}
|
||||
#endif
|
||||
if (!using_lapic_timer)
|
||||
hardclock(frame);
|
||||
}
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
/*
|
||||
* The acquire and release functions must be called at ipl >= splclock().
|
||||
*/
|
||||
int
|
||||
acquire_timer0(int rate, void (*function)(struct clockframe *frame))
|
||||
{
|
||||
static int old_rate;
|
||||
|
||||
if (rate <= 0 || rate > TIMER0_MAX_FREQ)
|
||||
return (-1);
|
||||
switch (timer0_state) {
|
||||
|
||||
case RELEASED:
|
||||
timer0_state = ACQUIRE_PENDING;
|
||||
break;
|
||||
|
||||
case RELEASE_PENDING:
|
||||
if (rate != old_rate)
|
||||
return (-1);
|
||||
/*
|
||||
* The timer has been released recently, but is being
|
||||
* re-acquired before the release completed. In this
|
||||
* case, we simply reclaim it as if it had not been
|
||||
* released at all.
|
||||
*/
|
||||
timer0_state = ACQUIRED;
|
||||
break;
|
||||
|
||||
default:
|
||||
return (-1); /* busy */
|
||||
}
|
||||
new_function = function;
|
||||
old_rate = new_rate = rate;
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
|
||||
int
|
||||
acquire_timer1(int mode)
|
||||
@ -323,27 +206,6 @@ acquire_timer2(int mode)
|
||||
return (0);
|
||||
}
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
int
|
||||
release_timer0()
|
||||
{
|
||||
switch (timer0_state) {
|
||||
|
||||
case ACQUIRED:
|
||||
timer0_state = RELEASE_PENDING;
|
||||
break;
|
||||
|
||||
case ACQUIRE_PENDING:
|
||||
/* Nothing happened yet, release quickly. */
|
||||
timer0_state = RELEASED;
|
||||
break;
|
||||
|
||||
default:
|
||||
return (-1);
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
|
||||
int
|
||||
release_timer1()
|
||||
@ -929,10 +791,6 @@ sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS)
|
||||
freq = timer_freq;
|
||||
error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
|
||||
if (error == 0 && req->newptr != NULL) {
|
||||
#ifndef BURN_BRIDGES
|
||||
if (timer0_state != RELEASED)
|
||||
return (EBUSY); /* too much trouble to handle */
|
||||
#endif
|
||||
set_timer_freq(freq, hz);
|
||||
i8254_timecounter.tc_frequency = freq;
|
||||
}
|
||||
|
||||
@ -97,23 +97,6 @@
|
||||
|
||||
#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x))
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
/*
|
||||
* Time in timer cycles that it takes for microtime() to disable interrupts
|
||||
* and latch the count. microtime() currently uses "cli; outb ..." so it
|
||||
* normally takes less than 2 timer cycles. Add a few for cache misses.
|
||||
* Add a few more to allow for latency in bogus calls to microtime() with
|
||||
* interrupts already disabled.
|
||||
*/
|
||||
#define TIMER0_LATCH_COUNT 20
|
||||
|
||||
/*
|
||||
* Maximum frequency that we are willing to allow for timer0. Must be
|
||||
* low enough to guarantee that the timer interrupt handler returns
|
||||
* before the next timer interrupt.
|
||||
*/
|
||||
#define TIMER0_MAX_FREQ 20000
|
||||
#endif
|
||||
|
||||
int adjkerntz; /* local offset from GMT in seconds */
|
||||
int clkintr_pending;
|
||||
@ -137,18 +120,6 @@ static u_int32_t i8254_offset;
|
||||
static int i8254_ticked;
|
||||
static int using_lapic_timer;
|
||||
static struct intsrc *i8254_intsrc;
|
||||
#ifndef BURN_BRIDGES
|
||||
/*
|
||||
* XXX new_function and timer_func should not handle clockframes, but
|
||||
* timer_func currently needs to hold hardclock to handle the
|
||||
* timer0_state == 0 case. We should use inthand_add()/inthand_remove()
|
||||
* to switch between clkintr() and a slightly different timerintr().
|
||||
*/
|
||||
static void (*new_function)(struct clockframe *frame);
|
||||
static u_int new_rate;
|
||||
static u_int timer0_prescaler_count;
|
||||
static u_char timer0_state;
|
||||
#endif
|
||||
|
||||
/* Values for timerX_state: */
|
||||
#define RELEASED 0
|
||||
@ -158,7 +129,6 @@ static u_char timer0_state;
|
||||
|
||||
static u_char timer1_state;
|
||||
static u_char timer2_state;
|
||||
static void (*timer_func)(struct clockframe *frame) = hardclock;
|
||||
static void rtc_serialcombit(int);
|
||||
static void rtc_serialcom(int);
|
||||
static int rtc_inb(void);
|
||||
@ -191,97 +161,10 @@ clkintr(struct clockframe *frame)
|
||||
clkintr_pending = 0;
|
||||
mtx_unlock_spin(&clock_lock);
|
||||
}
|
||||
if (timer_func != hardclock || !using_lapic_timer)
|
||||
timer_func(frame);
|
||||
#ifndef BURN_BRIDGES
|
||||
switch (timer0_state) {
|
||||
|
||||
case RELEASED:
|
||||
break;
|
||||
|
||||
case ACQUIRED:
|
||||
if (using_lapic_timer)
|
||||
break;
|
||||
if ((timer0_prescaler_count += timer0_max_count)
|
||||
>= hardclock_max_count) {
|
||||
timer0_prescaler_count -= hardclock_max_count;
|
||||
hardclock(frame);
|
||||
}
|
||||
break;
|
||||
|
||||
case ACQUIRE_PENDING:
|
||||
mtx_lock_spin(&clock_lock);
|
||||
i8254_offset = i8254_get_timecount(NULL);
|
||||
i8254_lastcount = 0;
|
||||
timer0_max_count = TIMER_DIV(new_rate);
|
||||
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);
|
||||
timer_func = new_function;
|
||||
timer0_state = ACQUIRED;
|
||||
break;
|
||||
|
||||
case RELEASE_PENDING:
|
||||
if ((timer0_prescaler_count += timer0_max_count)
|
||||
>= hardclock_max_count) {
|
||||
mtx_lock_spin(&clock_lock);
|
||||
i8254_offset = i8254_get_timecount(NULL);
|
||||
i8254_lastcount = 0;
|
||||
timer0_max_count = hardclock_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);
|
||||
timer0_prescaler_count = 0;
|
||||
timer_func = hardclock;
|
||||
timer0_state = RELEASED;
|
||||
if (!using_lapic_timer)
|
||||
hardclock(frame);
|
||||
}
|
||||
break;
|
||||
}
|
||||
#endif
|
||||
if (!using_lapic_timer)
|
||||
hardclock(frame);
|
||||
}
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
/*
|
||||
* The acquire and release functions must be called at ipl >= splclock().
|
||||
*/
|
||||
int
|
||||
acquire_timer0(int rate, void (*function)(struct clockframe *frame))
|
||||
{
|
||||
static int old_rate;
|
||||
|
||||
if (rate <= 0 || rate > TIMER0_MAX_FREQ)
|
||||
return (-1);
|
||||
switch (timer0_state) {
|
||||
|
||||
case RELEASED:
|
||||
timer0_state = ACQUIRE_PENDING;
|
||||
break;
|
||||
|
||||
case RELEASE_PENDING:
|
||||
if (rate != old_rate)
|
||||
return (-1);
|
||||
/*
|
||||
* The timer has been released recently, but is being
|
||||
* re-acquired before the release completed. In this
|
||||
* case, we simply reclaim it as if it had not been
|
||||
* released at all.
|
||||
*/
|
||||
timer0_state = ACQUIRED;
|
||||
break;
|
||||
|
||||
default:
|
||||
return (-1); /* busy */
|
||||
}
|
||||
new_function = function;
|
||||
old_rate = new_rate = rate;
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
|
||||
int
|
||||
acquire_timer1(int mode)
|
||||
@ -323,27 +206,6 @@ acquire_timer2(int mode)
|
||||
return (0);
|
||||
}
|
||||
|
||||
#ifndef BURN_BRIDGES
|
||||
int
|
||||
release_timer0()
|
||||
{
|
||||
switch (timer0_state) {
|
||||
|
||||
case ACQUIRED:
|
||||
timer0_state = RELEASE_PENDING;
|
||||
break;
|
||||
|
||||
case ACQUIRE_PENDING:
|
||||
/* Nothing happened yet, release quickly. */
|
||||
timer0_state = RELEASED;
|
||||
break;
|
||||
|
||||
default:
|
||||
return (-1);
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
|
||||
int
|
||||
release_timer1()
|
||||
@ -929,10 +791,6 @@ sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS)
|
||||
freq = timer_freq;
|
||||
error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
|
||||
if (error == 0 && req->newptr != NULL) {
|
||||
#ifndef BURN_BRIDGES
|
||||
if (timer0_state != RELEASED)
|
||||
return (EBUSY); /* too much trouble to handle */
|
||||
#endif
|
||||
set_timer_freq(freq, hz);
|
||||
i8254_timecounter.tc_frequency = freq;
|
||||
}
|
||||
|
||||
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Reference in New Issue
Block a user