mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-18 10:35:55 +00:00
6c2a062580
- Tidy up clock code. Don't repeatedly call hardclock(). - Remove intrnames, decrnest and intrcnt from locore.s - Coalesce all trap handling into a single stub that then calls a dispatch function. Submitted by: Peter Grehan <peterg@ptree32.com.au>
306 lines
7.4 KiB
C
306 lines
7.4 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
#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 <dev/ofw/openfirm.h>
|
|
|
|
#include <machine/clock.h>
|
|
#include <machine/cpu.h>
|
|
#include <machine/intr.h>
|
|
|
|
#if 0 /* XXX */
|
|
#include "adb.h"
|
|
#else
|
|
#define NADB 0
|
|
#endif
|
|
|
|
/*
|
|
* Initially we assume a processor with a bus frequency of 12.5 MHz.
|
|
*/
|
|
u_int tickspending;
|
|
static u_long ticks_per_sec = 12500000;
|
|
static u_long ns_per_tick = 80;
|
|
static long ticks_per_intr;
|
|
static volatile u_long lasttb;
|
|
|
|
#define SECDAY 86400
|
|
#define DIFF19041970 2082844800
|
|
|
|
#if NADB > 0
|
|
extern int adb_read_date_time(int *);
|
|
extern int adb_set_date_time(int);
|
|
#endif
|
|
|
|
static int clockinitted = 0;
|
|
|
|
static timecounter_get_t powerpc_get_timecount;
|
|
|
|
static struct timecounter powerpc_timecounter = {
|
|
powerpc_get_timecount, /* get_timecount */
|
|
0, /* no poll_pps */
|
|
~0u, /* counter_mask */
|
|
0, /* frequency */
|
|
"powerpc" /* name */
|
|
};
|
|
|
|
void
|
|
inittodr(time_t base)
|
|
{
|
|
time_t deltat;
|
|
u_int rtc_time;
|
|
struct timespec ts;
|
|
|
|
/*
|
|
* If we can't read from RTC, use the fs time.
|
|
*/
|
|
#if NADB > 0
|
|
if (adb_read_date_time(&rtc_time) < 0)
|
|
#endif
|
|
{
|
|
ts.tv_sec = base;
|
|
ts.tv_nsec = 0;
|
|
tc_setclock(&ts);
|
|
return;
|
|
}
|
|
clockinitted = 1;
|
|
ts.tv_sec = rtc_time - DIFF19041970;
|
|
|
|
deltat = ts.tv_sec - base;
|
|
if (deltat < 0) {
|
|
deltat = -deltat;
|
|
}
|
|
if (deltat < 2 * SECDAY) {
|
|
tc_setclock(&ts);
|
|
return;
|
|
}
|
|
|
|
printf("WARNING: clock %s %d days",
|
|
ts.tv_sec < base ? "lost" : "gained", (int)(deltat / SECDAY));
|
|
|
|
printf(" -- CHECK AND RESET THE DATE!\n");
|
|
}
|
|
|
|
/*
|
|
* Similar to the above
|
|
*/
|
|
void
|
|
resettodr()
|
|
{
|
|
#if NADB > 0
|
|
u_int rtc_time;
|
|
|
|
if (clockinitted) {
|
|
rtc_time = time.tv_sec + DIFF19041970;
|
|
adb_set_date_time(rtc_time);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void
|
|
decr_intr(struct clockframe *frame)
|
|
{
|
|
u_long tb;
|
|
long tick;
|
|
int nticks;
|
|
register_t msr;
|
|
|
|
/*
|
|
* Check whether we are initialized.
|
|
*/
|
|
if (!ticks_per_intr)
|
|
return;
|
|
|
|
/*
|
|
* Based on the actual time delay since the last decrementer reload,
|
|
* we arrange for earlier interrupt next time.
|
|
*/
|
|
__asm ("mftb %0; mfdec %1" : "=r"(tb), "=r"(tick));
|
|
for (nticks = 0; tick < 0; nticks++)
|
|
tick += ticks_per_intr;
|
|
mtdec(tick);
|
|
/*
|
|
* lasttb is used during microtime. Set it to the virtual
|
|
* start of this tick interval.
|
|
*/
|
|
lasttb = tb + tick - ticks_per_intr;
|
|
|
|
nticks += tickspending;
|
|
tickspending = 0;
|
|
|
|
/*
|
|
* Reenable interrupts
|
|
*/
|
|
#if 0
|
|
msr = mfmsr();
|
|
mtmsr(msr | PSL_EE | PSL_RI);
|
|
#endif
|
|
/*
|
|
* Do standard timer interrupt stuff.
|
|
* Do softclock stuff only on the last iteration.
|
|
*/
|
|
#if 0
|
|
while (--nticks > 0) {
|
|
hardclock(frame);
|
|
}
|
|
#endif
|
|
hardclock(frame);
|
|
}
|
|
|
|
void
|
|
cpu_initclocks(void)
|
|
{
|
|
int qhandle, phandle;
|
|
char name[32];
|
|
unsigned int msr;
|
|
|
|
phandle = 0;
|
|
|
|
/*
|
|
* Get this info during autoconf? XXX
|
|
*/
|
|
for (qhandle = OF_peer(0); qhandle; qhandle = phandle) {
|
|
if (OF_getprop(qhandle, "device_type", name, sizeof name) >= 0
|
|
&& !strcmp(name, "cpu")
|
|
&& OF_getprop(qhandle, "timebase-frequency",
|
|
&ticks_per_sec, sizeof ticks_per_sec) >= 0) {
|
|
/*
|
|
* Should check for correct CPU here? XXX
|
|
*/
|
|
msr = mfmsr();
|
|
mtmsr(msr & ~(PSL_EE|PSL_RI));
|
|
|
|
powerpc_timecounter.tc_frequency = ticks_per_sec;
|
|
tc_init(&powerpc_timecounter);
|
|
|
|
ns_per_tick = 1000000000 / ticks_per_sec;
|
|
ticks_per_intr = ticks_per_sec / hz;
|
|
__asm __volatile ("mftb %0" : "=r"(lasttb));
|
|
mtdec(ticks_per_intr);
|
|
|
|
mtmsr(msr);
|
|
|
|
break;
|
|
}
|
|
if ((phandle = OF_child(qhandle)))
|
|
continue;
|
|
while (qhandle) {
|
|
if ((phandle = OF_peer(qhandle)))
|
|
break;
|
|
qhandle = OF_parent(qhandle);
|
|
}
|
|
}
|
|
if (!phandle)
|
|
panic("no cpu node");
|
|
}
|
|
|
|
static __inline u_quad_t
|
|
mftb(void)
|
|
{
|
|
u_long scratch;
|
|
u_quad_t tb;
|
|
|
|
__asm ("1: mftbu %0; mftb %0+1; mftbu %1; cmpw 0,%0,%1; bne 1b"
|
|
: "=r"(tb), "=r"(scratch));
|
|
return tb;
|
|
}
|
|
|
|
static unsigned
|
|
powerpc_get_timecount(struct timecounter *tc)
|
|
{
|
|
return mftb();
|
|
}
|
|
|
|
/*
|
|
* Wait for about n microseconds (at least!).
|
|
*/
|
|
void
|
|
delay(int n)
|
|
{
|
|
u_quad_t tb;
|
|
u_long tbh, tbl, scratch;
|
|
|
|
tb = mftb();
|
|
tb += (n * 1000 + ns_per_tick - 1) / ns_per_tick;
|
|
tbh = tb >> 32;
|
|
tbl = tb;
|
|
__asm ("1: mftbu %0; cmplw %0,%1; blt 1b; bgt 2f;"
|
|
"mftb %0; cmplw %0,%2; blt 1b; 2:"
|
|
: "=r"(scratch) : "r"(tbh), "r"(tbl));
|
|
}
|
|
|
|
/*
|
|
* Nothing to do.
|
|
*/
|
|
void
|
|
setstatclockrate(int arg)
|
|
{
|
|
|
|
/* Do nothing */
|
|
}
|