448 lines
10 KiB
C
448 lines
10 KiB
C
/* $NetBSD: clock.c,v 1.5 2003/07/15 01:37:35 lukem Exp $ */
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/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.5 2003/07/15 01:37:35 lukem Exp $");
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#include "opt_ppcparam.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <uvm/uvm_extern.h>
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#include <dev/clock_subr.h>
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#include <machine/cpu.h>
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#include <powerpc/marvell/watchdog.h>
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#include "opt_kgdb.h"
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#if (defined(KGDB) || defined(DDB)) && 0
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#include <machine/db_machdep.h>
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struct stop_time stop_time;
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#endif
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/*
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* Initially we assume a processor with a bus frequency of 12.5 MHz.
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*/
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u_long tbhz = 0; /* global timebase ticks/sec */
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u_long ticks_per_sec = 25000000;
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u_long ns_per_tick = 40;
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static long ticks_per_intr;
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#if NRTC > 0
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static inline int yeartoday(int);
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#endif
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void decr_intr(struct clockframe *frame);
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static __inline void
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mttb(u_quad_t tb)
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{
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__asm __volatile ("mttbl %0; mttbu %1; mttbl %1+1"
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:: "r" (0), "r" (tb));
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}
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#if NRTC > 0
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static int month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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static int clockinitted = 0;
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static inline int
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yeartoday(int year)
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{
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return((year % 4) ? 365 : 366);
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}
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#endif /* NRTC */
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#define SECPERDAY (24*60*60)
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#define SECPERNYEAR (365*SECPERDAY)
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#define SECPER4YEARS (4*SECPERNYEAR+SECPERDAY)
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#define EPOCHYEAR 1970
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/*
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* Initialze the time of day register, based on the time base which is, e.g.
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* from a filesystem. Base provides the time to within six months,
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* and the time of year clock (if any) provides the rest.
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*/
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#define MINYEAR 2002 /* minimum plausible year */
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void
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inittodr(base)
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time_t base;
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{
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#if NRTC > 0
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rtc_t rtc;
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int year;
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struct clock_ymdhms dt;
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time_t deltat;
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int badbase;
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int s;
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if (base < (MINYEAR-1970)*SECYR) {
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printf("WARNING: preposterous time in file system");
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/* read the system clock anyway */
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base = (MINYEAR-1970)*SECYR;
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badbase = 1;
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} else
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badbase = 0;
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s = splclock();
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rtc_read(&rtc);
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(void)splx(s);
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#if defined(DEBUG) && 0
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printf("inittodr: %02d%02d/%02d/%02d %02d:%02d:%02d\n",
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rtc.rtc_century, rtc.rtc_year, rtc.rtc_month, rtc.rtc_day,
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rtc.rtc_hour, rtc.rtc_minute, rtc.rtc_second);
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#endif
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clockinitted = 1;
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year = (rtc.rtc_century * 100) + rtc.rtc_year;
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/* simple sanity checks (2037 = time_t overflow) */
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if (year < MINYEAR || year > 2037 ||
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rtc.rtc_month < 1 || rtc.rtc_month > 12 || rtc.rtc_day < 1 ||
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rtc.rtc_day > 31 || rtc.rtc_hour > 23 || rtc.rtc_minute > 59 ||
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rtc.rtc_second > 59) {
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/*
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* Believe the time in the file system for lack of
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* anything better, resetting the TODR.
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*/
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time.tv_sec = base;
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if (!badbase) {
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printf("WARNING: preposterous clock chip time\n");
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resettodr();
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}
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goto bad;
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}
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dt.dt_year = year;
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dt.dt_mon = rtc.rtc_month;
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dt.dt_day = rtc.rtc_day;
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dt.dt_hour = rtc.rtc_hour;
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dt.dt_min = rtc.rtc_minute;
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dt.dt_sec = rtc.rtc_second;
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time.tv_sec = clock_ymdhms_to_secs(&dt);
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if (!badbase) {
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/*
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* See if we gained/lost two or more days;
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* if so, assume something is amiss.
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*/
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deltat = time.tv_sec - base;
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if (deltat < 0)
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deltat = -deltat;
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if (deltat < 2 * SECDAY)
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return; /* all is well */
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printf("WARNING: clock %s %ld days\n",
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time.tv_sec < base ? "lost" : "gained",
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(long)deltat / SECDAY);
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}
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bad:
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printf("WARNING: CHECK AND RESET THE DATE!\n");
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#else /* NRTC */
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time.tv_sec = base;
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#endif /* NRTC */
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}
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/*
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* Reset the TODR based on the time value; used when the TODR
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* has a preposterous value and also when the time is reset
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* by the stime system call. Also called when the TODR goes past
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* TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight)
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* to wrap the TODR around.
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*/
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void
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resettodr()
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{
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#if NRTC > 0
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struct clock_ymdhms dt;
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rtc_t rtc;
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int s;
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if (!clockinitted)
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return;
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clock_secs_to_ymdhms(time.tv_sec, &dt);
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rtc.rtc_century = dt.dt_year / 100;
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rtc.rtc_year = dt.dt_year % 100;
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rtc.rtc_month = dt.dt_mon;
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rtc.rtc_day = dt.dt_day;
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rtc.rtc_hour = dt.dt_hour;
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rtc.rtc_minute = dt.dt_min;
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rtc.rtc_second = dt.dt_sec;
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#if defined(DEBUG) && 0
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printf("resettodr: %02d%02d/%02d/%02d %02d:%02d:%02d\n",
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rtc.rtc_century, rtc.rtc_year, rtc.rtc_month, rtc.rtc_day,
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rtc.rtc_hour, rtc.rtc_minute, rtc.rtc_second);
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#endif
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s = splclock();
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rtc_write(&rtc);
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(void)splx(s);
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#endif /* NRTC */
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}
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#ifdef DEBUG
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struct clockframe *clockframe = 0;
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#endif
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void
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decr_intr(struct clockframe *frame)
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{
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struct cpu_info * const ci = curcpu();
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u_quad_t tb;
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long tick;
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int nticks;
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int oipl;
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#ifdef DEBUG
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struct clockframe *oframe;
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#endif
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WATCHDOG_SERVICE();
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EXT_INTR_STATS_DEPTH();
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/*
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* Check whether we are initialized.
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*/
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if (!ticks_per_intr)
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return;
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#ifdef DEBUG
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if (extintr_disable() & PSL_EE)
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panic("decr_intr: msr & PSL_EE");
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oframe = clockframe;
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clockframe = frame;
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#endif
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/*
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* Based on the actual time delay since the last decrementer reload,
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* we arrange for earlier interrupt next time.
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*/
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tb = mftb();
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__asm __volatile ("mfdec %0" : "=r"(tick));
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for (nticks = 0; tick < 0; nticks++)
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tick += ticks_per_intr;
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__asm __volatile ("mtdec %0" :: "r"(tick));
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/*
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* lasttb is used during microtime. Set it to the virtual
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* start of this tick interval.
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*/
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ci->ci_lasttb = tb + (tick - ticks_per_intr);
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uvmexp.intrs++;
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curcpu()->ci_ev_clock.ev_count++;
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EXT_INTR_STATS_CAUSE(0, 0, 0, SIBIT(SIR_HWCLOCK));
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if (ci->ci_cpl >= IPL_CLOCK) {
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/*
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* we interrupted while at higher
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* priority, so defer this tick.
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*/
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ci->ci_tickspending += nticks;
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EXT_INTR_STATS_PEND_IRQ(SIR_HWCLOCK);
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} else {
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int oframepri;
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EXT_INTR_STATS_DECL(tstart);
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EXT_INTR_STATS_COMMIT_IRQ(SIR_HWCLOCK);
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EXT_INTR_STATS_PRE(SIR_HWCLOCK, tstart);
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nticks += ci->ci_tickspending;
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ci->ci_tickspending = 0;
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oipl = ci->ci_cpl;
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ci->ci_cpl = IPL_CLOCK;
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SPL_STATS_LOG(IPL_CLOCK, 0);
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(void)extintr_enable();
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/*
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* Do standard timer interrupt stuff.
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* prevent softclock stuff until the last iteration.
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*/
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oframepri = frame->pri;
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frame->pri = oipl;
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if (oipl < IPL_SOFTCLOCK)
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frame->pri = IPL_SOFTCLOCK;
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while (--nticks > 0)
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hardclock(frame);
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frame->pri = oipl;
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hardclock(frame);
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frame->pri = oframepri;
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(void)extintr_disable();
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ci->ci_cpl = oipl;
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SPL_STATS_LOG(oipl, 0);
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EXT_INTR_STATS_POST(SIR_HWCLOCK, tstart);
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}
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if (imask_test_v(&ipending, &imask[ci->ci_cpl]))
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intr_dispatch();
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#ifdef DEBUG
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if ((frame->srr1 & PSL_EE) == 0)
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panic("decr_intr: frame->srr1 & PSL_EE == 0");
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clockframe = oframe;
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#endif
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}
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void
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cpu_initclocks()
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{
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}
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void calc_delayconst(void);
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void
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calc_delayconst()
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{
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/*
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* Get this info during autoconf? XXX
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*/
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#ifdef CLOCKBASE
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ticks_per_sec = CLOCKBASE / 4; /* from config file */
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#endif
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cpu_timebase = ticks_per_sec;
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/*
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* Should check for correct CPU here? XXX
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*/
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ns_per_tick = 1000000000 / ticks_per_sec;
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ticks_per_intr = ticks_per_sec / hz;
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curcpu()->ci_lasttb = mftb();
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__asm __volatile ("mtdec %0" :: "r"(ticks_per_intr));
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}
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/*
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* Fill in *tvp with current time with microsecond resolution.
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*/
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void
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microtime(tvp)
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struct timeval *tvp;
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{
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u_quad_t tb;
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u_long t;
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int msr;
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msr = extintr_disable();
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*tvp = time;
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tb = mftb();
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t = (u_long)(tb - curcpu()->ci_lasttb);
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extintr_restore(msr);
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t *= ns_per_tick;
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t /= 1000;
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t += tvp->tv_usec;
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while (t >= 1000000) {
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t -= 1000000;
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tvp->tv_sec++;
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}
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tvp->tv_usec = t;
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}
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/*
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* Wait for about n microseconds (at least!).
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*/
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void
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delay(n)
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unsigned n;
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{
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u_quad_t tb;
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#ifdef DEBUG
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if (!ticks_per_intr)
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panic("delay: !ticks_per_intr");
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#endif
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if (n < 20)
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n = 20;
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tb = mftb();
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tb += (n * 1000 + ns_per_tick - 1) / ns_per_tick;
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while (tb > mftb())
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;
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}
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/*
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* Nothing to do.
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*/
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void
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setstatclockrate(arg)
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int arg;
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{
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/* Do nothing */
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}
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#if (defined(KGDB) || defined(DDB)) && 0
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/* Stop Time facility */
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int stop_time_disable;
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void
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clock_stop_time(struct stop_time *stp)
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{
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if (stop_time_disable) {
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stp->st_state |= STS_DISABLED;
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return;
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}
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if (stp->st_state & STS_STOPPED)
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return;
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stp->st_msr = extintr_disable();
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__asm __volatile ("mfdec %0" : "=r"(stp->st_decr));
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stp->st_tb = mftb();
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stp->st_state = STS_STOPPED;
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}
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void
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clock_restart_time(struct stop_time *stp)
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{
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if ((stp->st_state & STS_STOPPED) == 0) {
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if (stp->st_state & STS_DISABLED)
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return;
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else {
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#ifdef DIAGNOSTIC
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panic("clock_restart_time: was not stopped.");
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#else
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return;
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#endif
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}
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}
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stp->st_state = 0;
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mttb(stp->st_tb);
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__asm __volatile ("mtdec %0" :: "r"(stp->st_decr));
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extintr_restore(stp->st_msr);
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}
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#endif /* KGDB || DDB */
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