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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/init.h>
#include <gpxe/timer.h>
#include <stdio.h>
static struct timer ts_table[0]
__table_start ( struct timer, timers );
static struct timer ts_table_end[0]
__table_end ( struct timer, timers );
static struct timer *used_ts = NULL;
/*
* 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 t;
t = currticks();
while (t + usecs > currticks())
; /* xxx: Relax the cpu some way. */
}
static void timer_init(void)
{
struct timer *ts;
for (ts = ts_table; ts < ts_table_end; ts++) {
if (ts->init && ts->init() >= 0) {
used_ts = ts;
break;
}
}
assert(used_ts);
}
struct init_fn ts_init_fn __init_fn ( INIT_NORMAL ) = {
.initialise = timer_init,
};
/* Functions for public use. */
tick_t currticks(void)
{
tick_t ct;
assert(used_ts);
ct = used_ts->currticks();
DBG("currticks: %ld seconds and %06ld microseconds\n", ct/USECS_IN_SEC, ct%USECS_IN_SEC);
return ct;
}
void udelay(unsigned int usecs)
{
used_ts->udelay(usecs);
}
void mdelay(unsigned int msecs)
{
while(msecs--)
used_ts->udelay(USECS_IN_MSEC);
}
unsigned int sleep(unsigned int secs)
{
while (secs--)
mdelay(MSECS_IN_SEC);
return 0;
}
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