b40ce02a2f
new platform module. These are probed in early boot, and have the responsibility of determining the layout of physical memory, determining the CPU timebase frequency, and handling the zoo of SMP mechanisms found on PowerPC. Reviewed by: marcel, raj Book-E parts by: raj
206 lines
5.6 KiB
C
206 lines
5.6 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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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 __inline u_quad_t
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mftb(void)
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{
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u_long scratch;
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u_quad_t tb;
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__asm ("1: mftbu %0; mftb %0+1; mftbu %1; cmpw 0,%0,%1; bne 1b"
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: "=r"(tb), "=r"(scratch));
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return tb;
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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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