2010-05-26 16:57:34 +02:00
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/*
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* Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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FILE_LICENCE(GPL2_OR_LATER);
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2013-07-13 00:01:47 +02:00
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#include <stddef.h>
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2010-05-26 16:57:34 +02:00
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#include <ipxe/timer.h>
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#include <linux_api.h>
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/** @file
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*
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* iPXE timer API for linux
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*
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*/
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/**
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* Delay for a fixed number of microseconds
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*
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* @v usecs Number of microseconds for which to delay
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*/
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static void linux_udelay(unsigned long usecs)
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{
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linux_usleep(usecs);
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}
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/**
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* Get number of ticks per second
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*
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* @ret ticks_per_sec Number of ticks per second
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*/
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static unsigned long linux_ticks_per_sec(void)
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{
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return 1000;
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}
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/**
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* Get current system time in ticks
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*
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* linux doesn't provide an easy access to jiffies so implement it by measuring
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* the time since the first call to this function.
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*
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* @ret ticks Current time, in ticks
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*/
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static unsigned long linux_currticks(void)
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{
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static struct timeval start;
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static int initialized = 0;
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if (! initialized) {
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linux_gettimeofday(&start, NULL);
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initialized = 1;
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}
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struct timeval now;
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linux_gettimeofday(&now, NULL);
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unsigned long ticks = (now.tv_sec - start.tv_sec) * linux_ticks_per_sec();
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ticks += (now.tv_usec - start.tv_usec) / (long)(1000000 / linux_ticks_per_sec());
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return ticks;
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}
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PROVIDE_TIMER(linux, udelay, linux_udelay);
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PROVIDE_TIMER(linux, currticks, linux_currticks);
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PROVIDE_TIMER(linux, ticks_per_sec, linux_ticks_per_sec);
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