ed57871e83
and visible effect of the bug what that autoboot would boot a kernel after only a couple of seconds had passed instead of waiting the full 10 seconds it's supposed to wait by default. Add my copyright notice, since one was missing and I reimplemented the one and only function in this file. MFC after: 1 week
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*-
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* Copyright (c) 2005 Marcel Moolenaar
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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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*
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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 THE AUTHOR ``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 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF 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 <machine/prom.h>
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#include <machine/rpb.h>
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static unsigned long lastpcc;
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static int tnsec;
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/*
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* Count the number of elapsed seconds since this function was called first.
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* The algorithm uses the processor's cycle counter, which means that it'd
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* better be called frequently (on a 433Mhz machine this means at least once
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* every 9 seconds or so).
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*/
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int
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getsecs()
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{
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struct rpb *hwrpb = (struct rpb *)HWRPB_ADDR;
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unsigned long curpcc;
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int delta;
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if (tnsec == 0) {
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tnsec = 1;
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lastpcc = alpha_rpcc() & 0xfffffffful;
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return (tnsec);
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}
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curpcc = alpha_rpcc() & 0xfffffffful;
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if (curpcc < lastpcc)
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curpcc += 0x100000000ul;
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delta = (curpcc - lastpcc) / hwrpb->rpb_cc_freq;
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if (delta) {
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tnsec += delta;
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lastpcc = curpcc & 0xfffffffful;
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}
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return (tnsec);
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}
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