freebsd-dev/sys/pc98/cbus/pcrtc.c

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/*-
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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
1999-08-28 01:08:13 +00:00
* $FreeBSD$
*/
/*
* 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
*/
/*
Another round of merge/updates. (1) Add #ifdef PC98: sys/pc98/boot/biosboot/boot2.S (2) Fix bug that made it impossible to boot from sd's other than unit 0: sys/pc98/boot/biosboot/sys.c (3) Delete redundant $Id$: sys/pc98/pc98/clock.c (reject$B$5$l$k$+$b$7$l$J$$(B) (4) unt -> u_int: sys/pc98/pc98/if_ed.c (5) Add support for rebooting by the hot-key sequence: sys/pc98/pc98/kbdtables.h (6) Display now looks like PC/AT version: sys/pc98/pc98/npx.c (7) Change comment to match that of PC/AT version: sys/pc98/pc98/pc98.c (8) Add function prototypes: sys/pc98/pc98/pc98_machdep.c (9) Include PC98 headers: sys/pc98/pc98/sound/adlib_card.c sys/pc98/pc98/sound/audio.c sys/pc98/pc98/sound/dev_table.c sys/pc98/pc98/sound/dmabuf.c sys/pc98/pc98/sound/midi_synth.c sys/pc98/pc98/sound/midibuf.c sys/pc98/pc98/sound/opl3.c sys/pc98/pc98/sound/oatmgr.c sys/pc98/pc98/sound/sb16_dsp.c sys/pc98/pc98/sound/sb16_midi.c sys/pc98/pc98/sound/sb_card.c sys/pc98/pc98/sound/sb_dsp.c sys/pc98/pc98/sound/sb_midi.c sys/pc98/pc98/sound/sb_mixer.c sys/pc98/pc98/sound/sequencer.c sys/pc98/pc98/sound/sound_config.h sys/pc98/pc98/sound/sound_switch.c sys/pc98/pc98/sound/soundcard.c sys/pc98/pc98/sound/sys_timer.c (10) Merge in PC98 changes: sys/i386/isa/sound/os.h (11) Deleted as result of 9. and 10. above: sys/pc98/pc98/sound/ad1848_mixer.h sys/pc98/pc98/sound/aedsp16.c sys/pc98/pc98/sound/coproc.h sys/pc98/pc98/sound/finetune.h sys/pc98/pc98/sound/gus_hw.h sys/pc98/pc98/sound/gus_linearvol.h sys/pc98/pc98/sound/hex2hex.h sys/pc98/pc98/sound/mad16.h sys/pc98/pc98/sound/midi_ctrl.h sys/pc98/pc98/sound/midi_synth.h sys/pc98/pc98/sound/opl3.h sys/pc98/pc98/sound/os.h sys/pc98/pc98/sound/pas.h sys/pc98/pc98/sound/sb_mixer.h sys/pc98/pc98/sound/soundvers.h sys/pc98/pc98/sound/tuning.h Submitted by: The FreeBSD(98) Development Team
1996-10-29 08:37:02 +00:00
* modified for PC98 by Kakefuda
*/
#include "opt_clock.h"
#include "opt_apm.h"
#include "opt_mca.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/timetc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/cons.h>
#include <machine/clock.h>
#ifdef CLK_CALIBRATION_LOOP
#endif
#include <machine/cputypes.h>
#include <machine/frame.h>
#include <machine/limits.h>
#include <machine/md_var.h>
#include <machine/psl.h>
#ifdef APIC_IO
#include <machine/segments.h>
#endif
#if defined(SMP) || defined(APIC_IO)
#include <machine/smp.h>
#endif /* SMP || APIC_IO */
#include <machine/specialreg.h>
#include <i386/isa/icu.h>
#ifdef PC98
#include <pc98/pc98/pc98.h>
#include <pc98/pc98/pc98_machdep.h>
#include <i386/isa/isa_device.h>
#else
#include <i386/isa/isa.h>
#include <isa/rtc.h>
#endif
#include <isa/isavar.h>
#include <i386/isa/timerreg.h>
#include <i386/isa/intr_machdep.h>
#ifdef DEV_MCA
#include <i386/isa/mca_machdep.h>
#endif
#ifdef APIC_IO
#include <i386/isa/intr_machdep.h>
/* The interrupt triggered by the 8254 (timer) chip */
int apic_8254_intr;
static u_long read_intr_count __P((int vec));
static void setup_8254_mixed_mode __P((void));
#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)
#define DAYSPERYEAR (31+28+31+30+31+30+31+31+30+31+30+31)
#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x))
/*
* 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
int adjkerntz; /* local offset from GMT in seconds */
int clkintr_pending;
int disable_rtc_set; /* disable resettodr() if != 0 */
int statclock_disable;
#ifndef TIMER_FREQ
#ifdef PC98
#define TIMER_FREQ 2457600;
#else /* IBM-PC */
#define TIMER_FREQ 1193182;
#endif /* PC98 */
#endif
u_int timer_freq = TIMER_FREQ;
int timer0_max_count;
u_int tsc_freq;
int tsc_is_broken;
u_int tsc_present;
int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */
struct mtx 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 u_int32_t i8254_lastcount;
static u_int32_t i8254_offset;
static int i8254_ticked;
/*
* 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) __P((struct clockframe *frame));
static u_int new_rate;
#ifndef PC98
static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
static u_char rtc_statusb = RTCSB_24HR | RTCSB_PINTR;
#endif
static u_int timer0_prescaler_count;
/* Values for timerX_state: */
#define RELEASED 0
#define RELEASE_PENDING 1
#define ACQUIRED 2
#define ACQUIRE_PENDING 3
static u_char timer0_state;
#ifdef PC98
static u_char timer1_state;
#endif
static u_char timer2_state;
static void (*timer_func) __P((struct clockframe *frame)) = hardclock;
#ifdef PC98
static void rtc_serialcombit __P((int));
static void rtc_serialcom __P((int));
static int rtc_inb __P((void));
static void rtc_outb __P((int));
#endif
static unsigned i8254_get_timecount __P((struct timecounter *tc));
static unsigned tsc_get_timecount __P((struct timecounter *tc));
static void set_timer_freq(u_int freq, int intr_freq);
static struct timecounter tsc_timecounter = {
tsc_get_timecount, /* get_timecount */
0, /* no poll_pps */
~0u, /* counter_mask */
0, /* frequency */
"TSC" /* name */
};
SYSCTL_OPAQUE(_debug, OID_AUTO, tsc_timecounter, CTLFLAG_RD,
&tsc_timecounter, sizeof(tsc_timecounter), "S,timecounter", "");
static struct timecounter i8254_timecounter = {
i8254_get_timecount, /* get_timecount */
0, /* no poll_pps */
~0u, /* counter_mask */
0, /* frequency */
"i8254" /* name */
};
SYSCTL_OPAQUE(_debug, OID_AUTO, i8254_timecounter, CTLFLAG_RD,
&i8254_timecounter, sizeof(i8254_timecounter), "S,timecounter", "");
static void
clkintr(struct clockframe frame)
{
if (timecounter->tc_get_timecount == i8254_get_timecount) {
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_lock_spin(&clock_lock);
if (i8254_ticked)
i8254_ticked = 0;
else {
i8254_offset += timer0_max_count;
i8254_lastcount = 0;
}
clkintr_pending = 0;
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&clock_lock);
}
timer_func(&frame);
#ifdef SMP
if (timer_func == hardclock)
forward_hardclock();
#endif
switch (timer0_state) {
case RELEASED:
break;
case ACQUIRED:
if ((timer0_prescaler_count += timer0_max_count)
>= hardclock_max_count) {
timer0_prescaler_count -= hardclock_max_count;
hardclock(&frame);
#ifdef SMP
forward_hardclock();
#endif
}
break;
case ACQUIRE_PENDING:
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
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);
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
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) {
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
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);
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&clock_lock);
timer0_prescaler_count = 0;
timer_func = hardclock;
timer0_state = RELEASED;
hardclock(&frame);
#ifdef SMP
forward_hardclock();
#endif
}
break;
}
#ifdef DEV_MCA
/* Reset clock interrupt by asserting bit 7 of port 0x61 */
if (MCA_system)
outb(0x61, inb(0x61) | 0x80);
#endif
}
/*
* The acquire and release functions must be called at ipl >= splclock().
*/
int
acquire_timer0(int rate, void (*function) __P((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);
}
#ifdef PC98
int
acquire_timer1(int mode)
{
if (timer1_state != RELEASED)
return (-1);
timer1_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_SEL1 | (mode & 0x3f));
return (0);
}
#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_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);
}
#ifdef PC98
int
release_timer1()
{
if (timer1_state != ACQUIRED)
return (-1);
timer1_state = RELEASED;
outb(TIMER_MODE, TIMER_SEL1 | TIMER_SQWAVE | TIMER_16BIT);
return (0);
}
#endif
int
release_timer2()
{
if (timer2_state != ACQUIRED)
return (-1);
timer2_state = RELEASED;
outb(TIMER_MODE, TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT);
return (0);
}
#ifndef PC98
/*
* 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) {
statclock(&frame);
#ifdef SMP
forward_statclock();
#endif
}
}
#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 */
#endif /* for PC98 */
static int
getit(void)
{
int high, low;
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
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);
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
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).
*/
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) {
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)
{
#ifdef PC98 /* PC98 */
outb(IO_PPI, inb(IO_PPI)|0x08); /* disable counter1 output to speaker */
release_timer1();
#else
outb(IO_PPI, inb(IO_PPI)&0xFC); /* disable counter2 output to speaker */
release_timer2();
#endif
beeping = 0;
}
int
sysbeep(int pitch, int period)
{
int x = splclock();
#ifdef PC98
if (acquire_timer1(TIMER_SQWAVE|TIMER_16BIT))
if (!beeping) {
/* Something else owns it. */
splx(x);
return (-1); /* XXX Should be EBUSY, but nobody cares anyway. */
}
disable_intr();
outb(0x3fdb, pitch);
outb(0x3fdb, (pitch>>8));
enable_intr();
if (!beeping) {
/* enable counter1 output to speaker */
outb(IO_PPI, (inb(IO_PPI) & 0xf7));
beeping = period;
timeout(sysbeepstop, (void *)NULL, period);
}
#else
if (acquire_timer2(TIMER_SQWAVE|TIMER_16BIT))
if (!beeping) {
/* Something else owns it. */
splx(x);
return (-1); /* XXX Should be EBUSY, but nobody cares anyway. */
}
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_lock_spin(&clock_lock);
outb(TIMER_CNTR2, pitch);
outb(TIMER_CNTR2, (pitch>>8));
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&clock_lock);
if (!beeping) {
/* enable counter2 output to speaker */
outb(IO_PPI, inb(IO_PPI) | 3);
beeping = period;
timeout(sysbeepstop, (void *)NULL, period);
}
#endif
splx(x);
return (0);
}
#ifndef PC98
/*
* RTC support routines
*/
int
rtcin(reg)
int reg;
{
int s;
u_char val;
s = splhigh();
outb(IO_RTC, reg);
inb(0x84);
val = inb(IO_RTC + 1);
inb(0x84);
splx(s);
return (val);
}
static __inline void
writertc(u_char reg, u_char val)
{
int s;
s = splhigh();
inb(0x84);
outb(IO_RTC, reg);
inb(0x84);
outb(IO_RTC + 1, val);
inb(0x84); /* XXX work around wrong order in rtcin() */
splx(s);
}
static __inline int
readrtc(int port)
{
return(bcd2bin(rtcin(port)));
}
#endif
#ifdef PC98
unsigned int delaycount;
#define FIRST_GUESS 0x2000
static void findcpuspeed(void)
{
int i;
int remainder;
/* Put counter in count down mode */
outb(TIMER_MODE, TIMER_SEL0 | TIMER_16BIT | TIMER_RATEGEN);
outb(TIMER_CNTR0, 0xff);
outb(TIMER_CNTR0, 0xff);
for (i = FIRST_GUESS; i; i--)
;
remainder = getit();
delaycount = (FIRST_GUESS * TIMER_DIV(1000)) / (0xffff - remainder);
}
#endif
#ifdef PC98
static u_int
calibrate_clocks(void)
{
int timeout;
u_int count, prev_count, tot_count;
u_short sec, start_sec;
if (bootverbose)
printf("Calibrating clock(s) ... ");
/* Check ARTIC. */
if (!(PC98_SYSTEM_PARAMETER(0x458) & 0x80) &&
!(PC98_SYSTEM_PARAMETER(0x45b) & 0x04))
goto fail;
timeout = 100000000;
/* Read the ARTIC. */
sec = inw(0x5e);
/* Wait for the ARTIC to changes. */
start_sec = sec;
for (;;) {
sec = inw(0x5e);
if (sec != start_sec)
break;
if (--timeout == 0)
goto fail;
}
prev_count = getit();
if (prev_count == 0 || prev_count > timer0_max_count)
goto fail;
tot_count = 0;
if (tsc_present)
wrmsr(0x10, 0LL); /* XXX 0x10 is the MSR for the TSC */
start_sec = sec;
for (;;) {
sec = inw(0x5e);
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 + 1200) ||
(sec < start_sec &&
1998-10-13 03:24:01 +00:00
(u_int)sec + 0x10000 == (u_int)start_sec + 1200))
break;
if (--timeout == 0)
goto fail;
}
/*
* Read the cpu cycle counter. The timing considerations are
* similar to those for the i8254 clock.
*/
if (tsc_present)
tsc_freq = rdtsc();
if (bootverbose) {
if (tsc_present)
printf("TSC clock: %u Hz, ", tsc_freq);
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);
}
#else
static u_int
calibrate_clocks(void)
{
u_int64_t old_tsc;
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;
if (tsc_present)
old_tsc = rdtsc();
else
old_tsc = 0; /* shut up gcc */
/*
* 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;
}
/*
* Read the cpu cycle counter. The timing considerations are
* similar to those for the i8254 clock.
*/
if (tsc_present)
tsc_freq = rdtsc() - old_tsc;
if (bootverbose) {
if (tsc_present)
printf("TSC clock: %u Hz, ", tsc_freq);
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);
}
#endif /* !PC98 */
static void
set_timer_freq(u_int freq, int intr_freq)
{
int new_timer0_max_count;
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_lock_spin(&clock_lock);
timer_freq = freq;
new_timer0_max_count = hardclock_max_count = TIMER_DIV(intr_freq);
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);
}
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&clock_lock);
}
/*
* i8254_restore is called from apm_default_resume() to reload
* the countdown register.
* this should not be necessary but there are broken laptops that
* do not restore the countdown register on resume.
* when it happnes, it messes up the hardclock interval and system clock,
* which leads to the infamous "calcru: negative time" problem.
*/
void
i8254_restore(void)
{
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_lock_spin(&clock_lock);
outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
outb(TIMER_CNTR0, timer0_max_count & 0xff);
outb(TIMER_CNTR0, timer0_max_count >> 8);
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&clock_lock);
}
/*
* 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;
#ifdef PC98
findcpuspeed();
if (pc98_machine_type & M_8M)
timer_freq = 1996800L; /* 1.9968 MHz */
else
timer_freq = 2457600L; /* 2.4576 MHz */
#endif /* PC98 */
if (cpu_feature & CPUID_TSC)
tsc_present = 1;
else
tsc_present = 0;
#ifndef PC98
writertc(RTC_STATUSA, rtc_statusa);
writertc(RTC_STATUSB, RTCSB_24HR);
#endif
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);
tsc_freq = 0;
}
set_timer_freq(timer_freq, hz);
i8254_timecounter.tc_frequency = timer_freq;
tc_init(&i8254_timecounter);
#ifndef CLK_USE_TSC_CALIBRATION
if (tsc_freq != 0) {
if (bootverbose)
printf(
"CLK_USE_TSC_CALIBRATION not specified - using old calibration method\n");
tsc_freq = 0;
}
#endif
if (tsc_present && tsc_freq == 0) {
/*
* Calibration of the i586 clock relative to the mc146818A
* clock failed. Do a less accurate calibration relative
* to the i8254 clock.
*/
u_int64_t old_tsc = rdtsc();
DELAY(1000000);
tsc_freq = rdtsc() - old_tsc;
#ifdef CLK_USE_TSC_CALIBRATION
if (bootverbose)
printf("TSC clock: %u Hz (Method B)\n", tsc_freq);
#endif
}
#if !defined(SMP)
/*
* We can not use the TSC in SMP mode, until we figure out a
* cheap (impossible), reliable and precise (yeah right!) way
* to synchronize the TSCs of all the CPUs.
* Curse Intel for leaving the counter out of the I/O APIC.
*/
#ifdef DEV_APM
/*
* We can not use the TSC if we support APM. Precise timekeeping
* on an APM'ed machine is at best a fools pursuit, since
* any and all of the time spent in various SMM code can't
* be reliably accounted for. Reading the RTC is your only
* source of reliable time info. The i8254 looses too of course
* but we need to have some kind of time...
* We don't know at this point whether APM is going to be used
* or not, nor when it might be activated. Play it safe.
*/
{
int disabled = 0;
resource_int_value("apm", 0, "disabled", &disabled);
if (disabled == 0)
return;
}
#endif /* DEV_APM */
if (tsc_present && tsc_freq != 0 && !tsc_is_broken) {
tsc_timecounter.tc_frequency = tsc_freq;
tc_init(&tsc_timecounter);
}
#endif /* !defined(SMP) */
}
#ifdef PC98
static void
rtc_serialcombit(int i)
{
outb(IO_RTC, ((i&0x01)<<5)|0x07);
DELAY(1);
outb(IO_RTC, ((i&0x01)<<5)|0x17);
DELAY(1);
outb(IO_RTC, ((i&0x01)<<5)|0x07);
DELAY(1);
}
static void
rtc_serialcom(int i)
{
rtc_serialcombit(i&0x01);
rtc_serialcombit((i&0x02)>>1);
rtc_serialcombit((i&0x04)>>2);
rtc_serialcombit((i&0x08)>>3);
outb(IO_RTC, 0x07);
DELAY(1);
outb(IO_RTC, 0x0f);
DELAY(1);
outb(IO_RTC, 0x07);
DELAY(1);
}
static void
rtc_outb(int val)
{
int s;
int sa = 0;
for (s=0;s<8;s++) {
sa = ((val >> s) & 0x01) ? 0x27 : 0x07;
outb(IO_RTC, sa); /* set DI & CLK 0 */
DELAY(1);
outb(IO_RTC, sa | 0x10); /* CLK 1 */
DELAY(1);
}
outb(IO_RTC, sa & 0xef); /* CLK 0 */
}
static int
rtc_inb(void)
{
int s;
int sa = 0;
for (s=0;s<8;s++) {
sa |= ((inb(0x33) & 0x01) << s);
outb(IO_RTC, 0x17); /* CLK 1 */
DELAY(1);
outb(IO_RTC, 0x07); /* CLK 0 */
DELAY(2);
}
return sa;
}
#endif /* PC-98 */
/*
* 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;
#ifndef PC98
int yd;
#endif
int year, month;
int y, m, s;
1998-02-21 15:54:23 +00:00
struct timespec ts;
#ifdef PC98
int second, min, hour;
#endif
if (base) {
s = splclock();
ts.tv_sec = base;
ts.tv_nsec = 0;
tc_setclock(&ts);
splx(s);
}
#ifdef PC98
rtc_serialcom(0x03); /* Time Read */
rtc_serialcom(0x01); /* Register shift command. */
DELAY(20);
second = bcd2bin(rtc_inb() & 0xff); /* sec */
min = bcd2bin(rtc_inb() & 0xff); /* min */
hour = bcd2bin(rtc_inb() & 0xff); /* hour */
days = bcd2bin(rtc_inb() & 0xff) - 1; /* date */
month = (rtc_inb() >> 4) & 0x0f; /* month */
for (m = 1; m < month; m++)
days += daysinmonth[m-1];
year = bcd2bin(rtc_inb() & 0xff) + 1900; /* year */
/* 2000 year problem */
if (year < 1995)
year += 100;
if (year < 1970)
goto wrong_time;
for (y = 1970; y < year; y++)
days += DAYSPERYEAR + LEAPYEAR(y);
if ((month > 2) && LEAPYEAR(year))
days ++;
sec = ((( days * 24 +
hour) * 60 +
min) * 60 +
second);
/* sec now contains the number of seconds, since Jan 1 1970,
in the local time zone */
2000-10-15 04:54:17 +00:00
s = splhigh();
#else /* IBM-PC */
/* 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;
yd = days;
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 */
#endif
sec += tz.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;
#ifdef PC98
int wd;
#endif
if (disable_rtc_set)
return;
s = splclock();
tm = time_second;
splx(s);
#ifdef PC98
rtc_serialcom(0x01); /* Register shift command. */
/* Calculate local time to put in RTC */
tm -= tz.tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0);
rtc_outb(bin2bcd(tm%60)); tm /= 60; /* Write back Seconds */
rtc_outb(bin2bcd(tm%60)); tm /= 60; /* Write back Minutes */
rtc_outb(bin2bcd(tm%24)); tm /= 24; /* Write back Hours */
/* We have now the days since 01-01-1970 in tm */
wd = (tm+4)%7;
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 */
for (m = 0; ; m++) {
int ml;
ml = daysinmonth[m];
if (m == 1 && LEAPYEAR(y))
ml++;
if (tm < ml)
break;
tm -= ml;
}
m++;
rtc_outb(bin2bcd(tm+1)); /* Write back Day */
rtc_outb((m << 4) | wd); /* Write back Month & Weekday */
rtc_outb(bin2bcd(y%100)); /* Write back Year */
rtc_serialcom(0x02); /* Time set & Counter hold command. */
rtc_serialcom(0x00); /* Register hold command. */
#else
/* Disable RTC updates and interrupts. */
writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
/* Calculate local time to put in RTC */
tm -= tz.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); /* 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);
#endif /* PC98 */
}
/*
* Start both clocks running.
*/
void
cpu_initclocks()
{
#ifdef APIC_IO
int apic_8254_trial;
void *clkdesc;
#endif /* APIC_IO */
#ifndef PC98
int diag;
if (statclock_disable) {
/*
* The stat interrupt mask is different without the
* statistics clock. Also, don't set the interrupt
* flag which would normally cause the RTC to generate
* interrupts.
*/
rtc_statusb = RTCSB_24HR;
} else {
/* Setting stathz to nonzero early helps avoid races. */
stathz = RTC_NOPROFRATE;
profhz = RTC_PROFRATE;
}
#endif
/* Finish initializing 8253 timer 0. */
#ifdef APIC_IO
apic_8254_intr = isa_apic_irq(0);
apic_8254_trial = 0;
if (apic_8254_intr >= 0 ) {
if (apic_int_type(0, 0) == 3)
apic_8254_trial = 1;
} else {
/* look for ExtInt on pin 0 */
if (apic_int_type(0, 0) == 3) {
apic_8254_intr = apic_irq(0, 0);
setup_8254_mixed_mode();
} else
panic("APIC_IO: Cannot route 8254 interrupt to CPU");
}
inthand_add("clk", apic_8254_intr, (driver_intr_t *)clkintr, NULL,
INTR_TYPE_CLK | INTR_FAST, &clkdesc);
INTREN(1 << apic_8254_intr);
#else /* APIC_IO */
/*
* XXX Check the priority of this interrupt handler. I
* couldn't find anything suitable in the BSD/OS code (grog,
* 19 July 2000).
*/
inthand_add("clk", 0, (driver_intr_t *)clkintr, NULL,
INTR_TYPE_CLK | INTR_FAST, NULL);
INTREN(IRQ0);
#endif /* APIC_IO */
#ifndef PC98
/* Initialize RTC. */
writertc(RTC_STATUSA, rtc_statusa);
writertc(RTC_STATUSB, RTCSB_24HR);
/* Don't bother enabling the statistics clock. */
if (statclock_disable)
return;
diag = rtcin(RTC_DIAG);
if (diag != 0)
printf("RTC BIOS diagnostic error %b\n", diag, RTCDG_BITS);
#endif /* !PC98 */
#ifndef PC98
#ifdef APIC_IO
if (isa_apic_irq(8) != 8)
panic("APIC RTC != 8");
#endif /* APIC_IO */
inthand_add("rtc", 8, (driver_intr_t *)rtcintr, NULL,
INTR_TYPE_CLK | INTR_FAST, NULL);
#ifdef APIC_IO
INTREN(APIC_IRQ8);
#else
INTREN(IRQ8);
#endif /* APIC_IO */
writertc(RTC_STATUSB, rtc_statusb);
#endif /* PC98 */
#ifdef APIC_IO
if (apic_8254_trial) {
printf("APIC_IO: Testing 8254 interrupt delivery\n");
while (read_intr_count(8) < 6)
; /* nothing */
if (read_intr_count(apic_8254_intr) < 3) {
/*
* The MP table is broken.
* The 8254 was not connected to the specified pin
* on the IO APIC.
* Workaround: Limited variant of mixed mode.
*/
INTRDIS(1 << apic_8254_intr);
inthand_remove(clkdesc);
printf("APIC_IO: Broken MP table detected: "
"8254 is not connected to "
"IOAPIC #%d intpin %d\n",
int_to_apicintpin[apic_8254_intr].ioapic,
int_to_apicintpin[apic_8254_intr].int_pin);
/*
* Revoke current ISA IRQ 0 assignment and
* configure a fallback interrupt routing from
* the 8254 Timer via the 8259 PIC to the
* an ExtInt interrupt line on IOAPIC #0 intpin 0.
* We reuse the low level interrupt handler number.
*/
if (apic_irq(0, 0) < 0) {
revoke_apic_irq(apic_8254_intr);
assign_apic_irq(0, 0, apic_8254_intr);
}
apic_8254_intr = apic_irq(0, 0);
setup_8254_mixed_mode();
inthand_add("clk", apic_8254_intr,
(driver_intr_t *)clkintr, NULL,
INTR_TYPE_CLK | INTR_FAST, NULL);
INTREN(1 << apic_8254_intr);
}
}
if (apic_int_type(0, 0) != 3 ||
int_to_apicintpin[apic_8254_intr].ioapic != 0 ||
int_to_apicintpin[apic_8254_intr].int_pin != 0)
printf("APIC_IO: routing 8254 via IOAPIC #%d intpin %d\n",
int_to_apicintpin[apic_8254_intr].ioapic,
int_to_apicintpin[apic_8254_intr].int_pin);
else
printf("APIC_IO: "
"routing 8254 via 8259 and IOAPIC #0 intpin 0\n");
#endif
}
#ifdef APIC_IO
static u_long
read_intr_count(int vec)
{
u_long *up;
up = intr_countp[vec];
if (up)
return *up;
return 0UL;
}
static void
setup_8254_mixed_mode()
{
/*
* Allow 8254 timer to INTerrupt 8259:
* re-initialize master 8259:
* reset; prog 4 bytes, single ICU, edge triggered
*/
outb(IO_ICU1, 0x13);
#ifdef PC98
outb(IO_ICU1 + 2, NRSVIDT); /* start vector (unused) */
outb(IO_ICU1 + 2, 0x00); /* ignore slave */
outb(IO_ICU1 + 2, 0x03); /* auto EOI, 8086 */
outb(IO_ICU1 + 2, 0xfe); /* unmask INT0 */
#else
outb(IO_ICU1 + 1, NRSVIDT); /* start vector (unused) */
outb(IO_ICU1 + 1, 0x00); /* ignore slave */
outb(IO_ICU1 + 1, 0x03); /* auto EOI, 8086 */
outb(IO_ICU1 + 1, 0xfe); /* unmask INT0 */
#endif
/* program IO APIC for type 3 INT on INT0 */
if (ext_int_setup(0, 0) < 0)
panic("8254 redirect via APIC pin0 impossible!");
}
#endif
void
setstatclockrate(int newhz)
{
#ifndef PC98
if (newhz == RTC_PROFRATE)
rtc_statusa = RTCSA_DIVIDER | RTCSA_PROF;
else
rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
writertc(RTC_STATUSA, rtc_statusa);
#endif
}
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) {
if (timer0_state != RELEASED)
return (EBUSY); /* too much trouble to handle */
set_timer_freq(freq, hz);
i8254_timecounter.tc_frequency = freq;
tc_update(&i8254_timecounter);
}
return (error);
}
SYSCTL_PROC(_machdep, OID_AUTO, i8254_freq, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(u_int), sysctl_machdep_i8254_freq, "I", "");
static int
sysctl_machdep_tsc_freq(SYSCTL_HANDLER_ARGS)
{
int error;
u_int freq;
if (tsc_timecounter.tc_frequency == 0)
return (EOPNOTSUPP);
freq = tsc_freq;
error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
if (error == 0 && req->newptr != NULL) {
tsc_freq = freq;
tsc_timecounter.tc_frequency = tsc_freq;
tc_update(&tsc_timecounter);
}
return (error);
}
SYSCTL_PROC(_machdep, OID_AUTO, tsc_freq, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(u_int), sysctl_machdep_tsc_freq, "I", "");
static unsigned
i8254_get_timecount(struct timecounter *tc)
{
u_int count;
u_int high, low;
u_int eflags;
eflags = read_eflags();
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
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)) &&
#ifdef APIC_IO
#define lapic_irr1 ((volatile u_int *)&lapic)[0x210 / 4] /* XXX XXX */
/* XXX this assumes that apic_8254_intr is < 24. */
(lapic_irr1 & (1 << apic_8254_intr))))
#else
(inb(IO_ICU1) & 1)))
#endif
)) {
i8254_ticked = 1;
i8254_offset += timer0_max_count;
}
i8254_lastcount = count;
count += i8254_offset;
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&clock_lock);
return (count);
}
static unsigned
tsc_get_timecount(struct timecounter *tc)
{
return (rdtsc());
}
/*
* 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);