2007-12-01 05:07:01 +01:00
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/*
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* core/timer.c
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*
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* Copyright (C) 2007 Alexey Zaytsev <alexey.zaytsev@gmail.com>
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*
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2005-03-08 19:53:11 +01:00
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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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2007-12-01 05:07:01 +01:00
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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2005-03-08 19:53:11 +01:00
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*/
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2007-12-01 05:07:01 +01:00
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#include <stddef.h>
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#include <assert.h>
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#include <gpxe/timer.h>
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2005-03-08 19:53:11 +01:00
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2007-12-01 05:07:01 +01:00
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static struct timer ts_table[0]
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__table_start ( struct timer, timers );
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static struct timer ts_table_end[0]
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__table_end ( struct timer, timers );
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2005-03-08 19:53:11 +01:00
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2007-12-01 05:07:01 +01:00
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/*
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* This function may be used in custom timer driver.
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*
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* This udelay implementation works well if you've got a
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* fast currticks().
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*/
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2008-03-18 16:23:10 +01:00
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void generic_currticks_udelay ( unsigned int usecs ) {
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tick_t start;
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tick_t elapsed;
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start = currticks();
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do {
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/* xxx: Relax the cpu some way. */
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elapsed = ( currticks() - start );
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} while ( elapsed < usecs );
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2005-03-08 19:53:11 +01:00
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}
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2008-03-18 16:23:10 +01:00
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/**
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* Identify timer source
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*
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* @ret timer Timer source
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*/
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static struct timer * timer ( void ) {
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static struct timer *ts = NULL;
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2007-12-01 05:07:01 +01:00
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2008-03-18 16:23:10 +01:00
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/* If we have a timer, use it */
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if ( ts )
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return ts;
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2007-12-01 05:07:01 +01:00
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2008-03-18 16:23:10 +01:00
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/* Scan for a usable timer */
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for ( ts = ts_table ; ts < ts_table_end ; ts++ ) {
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if ( ts->init() == 0 )
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return ts;
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2007-12-01 05:07:01 +01:00
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}
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2008-03-18 15:48:28 +01:00
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/* No timer found; we cannot continue */
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assert ( 0 );
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while ( 1 ) {};
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2005-03-08 19:53:11 +01:00
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}
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2007-12-01 05:07:01 +01:00
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2008-03-18 15:48:28 +01:00
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/**
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* Read current time
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*
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* @ret ticks Current time, in ticks
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*/
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tick_t currticks ( void ) {
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2007-12-01 05:07:01 +01:00
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tick_t ct;
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2008-03-18 16:23:10 +01:00
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ct = timer()->currticks();
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2008-03-18 15:48:28 +01:00
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DBG ( "currticks: %ld.%06ld seconds\n",
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ct / USECS_IN_SEC, ct % USECS_IN_SEC );
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2007-12-01 05:07:01 +01:00
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return ct;
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}
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2008-03-18 15:48:28 +01:00
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/**
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* Delay
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*
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* @v usecs Time to delay, in microseconds
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*/
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void udelay ( unsigned int usecs ) {
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2008-03-18 16:23:10 +01:00
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timer()->udelay ( usecs );
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2007-12-01 05:07:01 +01:00
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}
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2008-03-18 15:48:28 +01:00
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/**
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* Delay
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*
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* @v msecs Time to delay, in milliseconds
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*/
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void mdelay ( unsigned int msecs ) {
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while ( msecs-- )
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udelay ( USECS_IN_MSEC );
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2007-12-01 05:07:01 +01:00
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}
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2008-03-18 15:48:28 +01:00
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/**
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* Delay
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*
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* @v secs Time to delay, in seconds
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*/
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unsigned int sleep ( unsigned int secs ) {
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while ( secs-- )
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mdelay ( MSECS_IN_SEC );
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2007-12-01 05:07:01 +01:00
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return 0;
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}
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