7ad9c533ef
- make mftb() shared, rewrite in C, provide complementary mttb() - adjust SMP startup per the above, additional comments, minor naming changes - eliminate redundant TB defines, other minor cosmetics Reviewed by: marcel, nwhitehorn Obtained from: Freescale, Semihalf
203 lines
5.4 KiB
C
203 lines
5.4 KiB
C
/*-
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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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* $NetBSD: clock.c,v 1.9 2000/01/19 02:52:19 msaitoh Exp $
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*/
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/*
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* Copyright (C) 2001 Benno Rice.
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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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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/interrupt.h>
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#include <sys/pcpu.h>
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#include <sys/sysctl.h>
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#include <sys/timetc.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/clock.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <machine/md_var.h>
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#include <machine/smp.h>
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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 ns_per_tick = 80;
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static u_long ticks_per_sec = 12500000;
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static long ticks_per_intr;
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static timecounter_get_t decr_get_timecount;
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static struct timecounter decr_timecounter = {
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decr_get_timecount, /* get_timecount */
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0, /* no poll_pps */
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~0u, /* counter_mask */
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0, /* frequency */
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"decrementer" /* name */
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};
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void
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decr_intr(struct trapframe *frame)
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{
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long tick;
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int nticks;
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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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/*
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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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__asm ("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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mtdec(tick);
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if (PCPU_GET(cpuid) == 0) {
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while (nticks-- > 0)
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hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
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} else {
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while (nticks-- > 0)
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hardclock_cpu(TRAPF_USERMODE(frame));
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}
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}
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void
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decr_init(void)
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{
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struct cpuref cpu;
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register_t msr;
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/*
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* Check the BSP's timebase frequency. Sometimes we can't find the BSP, so fall
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* back to the first CPU in this case.
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*/
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if (platform_smp_get_bsp(&cpu) != 0)
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platform_smp_first_cpu(&cpu);
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ticks_per_sec = platform_timebase_freq(&cpu);
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msr = mfmsr();
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mtmsr(msr & ~PSL_EE);
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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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mtdec(ticks_per_intr);
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mtmsr(msr);
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}
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#ifdef SMP
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void
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decr_ap_init(void)
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{
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}
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#endif
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void
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decr_tc_init(void)
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{
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decr_timecounter.tc_frequency = ticks_per_sec;
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tc_init(&decr_timecounter);
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}
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static unsigned
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decr_get_timecount(struct timecounter *tc)
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{
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register_t tb;
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__asm __volatile("mftb %0" : "=r"(tb));
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return (tb);
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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(int n)
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{
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u_quad_t tb, ttb;
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tb = mftb();
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ttb = tb + (n * 1000 + ns_per_tick - 1) / ns_per_tick;
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while (tb < ttb)
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tb = mftb();
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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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cpu_startprofclock(void)
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{
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/* Do nothing */
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}
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void
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cpu_stopprofclock(void)
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{
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}
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