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/*
* core/timer.c
*
* Copyright (C) 2007 Alexey Zaytsev <alexey.zaytsev@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stddef.h>
#include <assert.h>
#include <gpxe/timer.h>
static struct timer ts_table[0]
__table_start ( struct timer, timers );
static struct timer ts_table_end[0]
__table_end ( struct timer, timers );
/*
* This function may be used in custom timer driver.
*
* This udelay implementation works well if you've got a
* fast currticks().
*/
void generic_currticks_udelay ( unsigned int usecs ) {
tick_t start;
tick_t elapsed;
start = currticks();
do {
/* xxx: Relax the cpu some way. */
elapsed = ( currticks() - start );
} while ( elapsed < usecs );
}
/**
* Identify timer source
*
* @ret timer Timer source
*/
static struct timer * timer ( void ) {
static struct timer *ts = NULL;
/* If we have a timer, use it */
if ( ts )
return ts;
/* Scan for a usable timer */
for ( ts = ts_table ; ts < ts_table_end ; ts++ ) {
if ( ts->init() == 0 )
return ts;
}
/* No timer found; we cannot continue */
assert ( 0 );
while ( 1 ) {};
}
/**
* Read current time
*
* @ret ticks Current time, in ticks
*/
tick_t currticks ( void ) {
tick_t ct;
ct = timer()->currticks();
DBG ( "currticks: %ld.%06ld seconds\n",
ct / USECS_IN_SEC, ct % USECS_IN_SEC );
return ct;
}
/**
* Delay
*
* @v usecs Time to delay, in microseconds
*/
void udelay ( unsigned int usecs ) {
timer()->udelay ( usecs );
}
/**
* Delay
*
* @v msecs Time to delay, in milliseconds
*/
void mdelay ( unsigned int msecs ) {
while ( msecs-- )
udelay ( USECS_IN_MSEC );
}
/**
* Delay
*
* @v secs Time to delay, in seconds
*/
unsigned int sleep ( unsigned int secs ) {
while ( secs-- )
mdelay ( MSECS_IN_SEC );
return 0;
}
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