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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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