9b4a8ab7ba
for better structure. Much of this is related to <sys/clock.h>, which should really have been called <sys/calendar.h>, but unless and until we need the name, the repocopy can wait. In general the kernel does not know about minutes, hours, days, timezones, daylight savings time, leap-years and such. All that is theoretically a matter for userland only. Parts of kernel code does however care: badly designed filesystems store timestamps in local time and RTC chips almost universally track time in a YY-MM-DD HH:MM:SS format, and sometimes in local timezone instead of UTC. For this we have <sys/clock.h> <sys/time.h> on the other hand, deals with time_t, timeval, timespec and so on. These know only seconds and fractions thereof. Move inittodr() and resettodr() prototypes to <sys/time.h>. Retain the names as it is one of the few surviving PDP/VAX references. Move startrtclock() to <machine/clock.h> on relevant platforms, it is a MD call between machdep.c/clock.c. Remove references to it elsewhere. Remove a lot of unnecessary <sys/clock.h> includes. Move the machdep.disable_rtc_set sysctl to subr_rtc.c where it belongs. XXX: should be kern.disable_rtc_set really, it's not MD.
222 lines
5.6 KiB
C
222 lines
5.6 KiB
C
/*-
|
|
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
|
|
* Copyright (C) 1995, 1996 TooLs GmbH.
|
|
* All rights reserved.
|
|
*
|
|
* 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 TooLs GmbH.
|
|
* 4. The name of TooLs GmbH may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
|
|
*
|
|
* $NetBSD: clock.c,v 1.9 2000/01/19 02:52:19 msaitoh Exp $
|
|
*/
|
|
/*
|
|
* Copyright (C) 2001 Benno Rice.
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/timetc.h>
|
|
#include <sys/interrupt.h>
|
|
|
|
#include <machine/clock.h>
|
|
#include <machine/psl.h>
|
|
#include <machine/spr.h>
|
|
#include <machine/cpu.h>
|
|
#include <machine/intr.h>
|
|
#include <machine/md_var.h>
|
|
|
|
/*
|
|
* Initially we assume a processor with a bus frequency of 12.5 MHz.
|
|
*/
|
|
u_int tickspending;
|
|
u_long ns_per_tick = 80;
|
|
static u_long ticks_per_sec = 12500000;
|
|
static long ticks_per_intr;
|
|
|
|
#define DIFF19041970 2082844800
|
|
|
|
static timecounter_get_t decr_get_timecount;
|
|
|
|
static struct timecounter decr_timecounter = {
|
|
decr_get_timecount, /* get_timecount */
|
|
0, /* no poll_pps */
|
|
~0u, /* counter_mask */
|
|
0, /* frequency */
|
|
"decrementer" /* name */
|
|
};
|
|
|
|
void
|
|
decr_intr(struct trapframe *frame)
|
|
{
|
|
u_long msr;
|
|
|
|
/*
|
|
* Check whether we are initialized.
|
|
*/
|
|
if (!ticks_per_intr)
|
|
return;
|
|
|
|
/*
|
|
* Interrupt handler must reset DIS to avoid getting another
|
|
* interrupt once EE is enabled.
|
|
*/
|
|
mtspr(SPR_TSR, TSR_DIS);
|
|
|
|
/*
|
|
* Reenable interrupts
|
|
*/
|
|
msr = mfmsr();
|
|
mtmsr(msr | PSL_EE);
|
|
|
|
hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
|
|
}
|
|
|
|
void
|
|
cpu_initclocks(void)
|
|
{
|
|
|
|
return;
|
|
}
|
|
|
|
void
|
|
decr_config (unsigned long freq)
|
|
{
|
|
ticks_per_sec = freq;
|
|
decr_timecounter.tc_frequency = freq;
|
|
}
|
|
|
|
void
|
|
decr_init (void)
|
|
{
|
|
unsigned int msr;
|
|
|
|
/*
|
|
* Should check for correct CPU here? XXX
|
|
*/
|
|
msr = mfmsr();
|
|
mtmsr(msr & ~(PSL_EE));
|
|
|
|
tc_init(&decr_timecounter);
|
|
|
|
ns_per_tick = 1000000000 / ticks_per_sec;
|
|
ticks_per_intr = ticks_per_sec / hz;
|
|
|
|
mtdec(ticks_per_intr);
|
|
|
|
mtspr(SPR_DECAR, ticks_per_intr);
|
|
mtspr(SPR_TCR, mfspr(SPR_TCR) | TCR_DIE | TCR_ARE);
|
|
|
|
mtmsr(msr);
|
|
}
|
|
|
|
static __inline u_quad_t
|
|
mftb (void)
|
|
{
|
|
u_long scratch;
|
|
u_quad_t tb;
|
|
|
|
__asm__ __volatile__(
|
|
"1: mftbu %0;"
|
|
" mftb %0+1;"
|
|
" mftbu %1;"
|
|
" cmpw 0,%0,%1;"
|
|
" bne 1b"
|
|
: "=r"(tb), "=r"(scratch));
|
|
return tb;
|
|
}
|
|
|
|
static unsigned
|
|
decr_get_timecount(struct timecounter *tc)
|
|
{
|
|
quad_t tb;
|
|
|
|
tb = mftb();
|
|
return tb;
|
|
}
|
|
|
|
/*
|
|
* Wait for about n microseconds (at least!).
|
|
*/
|
|
void
|
|
DELAY(int n)
|
|
{
|
|
u_quad_t start, end, now;
|
|
|
|
#define USECS_IN_SEC 1000000ULL
|
|
|
|
if (n > USECS_IN_SEC) {
|
|
printf("WARNING: %s(%d) called from %p", __func__, n,
|
|
__builtin_return_address(0));
|
|
}
|
|
|
|
start = mftb();
|
|
end = start + (u_quad_t)ticks_per_sec / ( USECS_IN_SEC / n);
|
|
do {
|
|
now = mftb();
|
|
} while (now < end || (now > start && end < start));
|
|
}
|
|
|
|
/*
|
|
* Nothing to do.
|
|
*/
|
|
void
|
|
cpu_startprofclock(void)
|
|
{
|
|
|
|
/* Do nothing */
|
|
}
|
|
|
|
void
|
|
cpu_stopprofclock(void)
|
|
{
|
|
|
|
}
|