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- /*
- * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- #include <string.h>
- #include <ipxe/process.h>
- #include <ipxe/console.h>
- #include <ipxe/keys.h>
- #include <ipxe/nap.h>
- #include <ipxe/init.h>
- #include <ipxe/timer.h>
-
- /** Current timer */
- static struct timer *timer;
-
- /**
- * Get current system time in ticks
- *
- * @ret ticks Current time, in ticks
- */
- unsigned long currticks ( void ) {
-
- /* Guard against use during early initialisation */
- if ( ! timer ) {
- DBGC ( &timer, "TIMER currticks() called before initialisation "
- "from %p\n", __builtin_return_address ( 0 ) );
- return 0;
- }
-
- /* Use selected timer */
- return timer->currticks();
- }
-
- /**
- * Delay for a fixed number of microseconds
- *
- * @v usecs Number of microseconds for which to delay
- */
- void udelay ( unsigned long usecs ) {
-
- /* Guard against use during early initialisation */
- if ( ! timer ) {
- DBGC ( &timer, "TIMER udelay() called before initialisation "
- "from %p\n", __builtin_return_address ( 0 ) );
- return;
- }
-
- /* Use selected timer */
- timer->udelay ( usecs );
- }
-
- /**
- * Delay for a fixed number of milliseconds
- *
- * @v msecs Number of milliseconds for which to delay
- */
- void mdelay ( unsigned long msecs ) {
-
- /* Guard against use during early initialisation */
- if ( ! timer ) {
- DBGC ( &timer, "TIMER mdelay() called before initialisation "
- "from %p\n", __builtin_return_address ( 0 ) );
- return;
- }
-
- /* Delay for specified number of milliseconds */
- while ( msecs-- )
- udelay ( 1000 );
- }
-
- /**
- * Sleep (possibly interruptibly) for a fixed number of seconds
- *
- * @v secs Number of seconds for which to delay
- * @v interrupted Interrupt checking method, or NULL
- * @ret secs Number of seconds remaining, if interrupted
- */
- static unsigned int sleep_interruptible ( unsigned int secs,
- int ( * interrupted ) ( void ) ) {
- unsigned long start = currticks();
- unsigned long now;
-
- for ( ; secs ; secs-- ) {
- while ( ( ( now = currticks() ) - start ) < TICKS_PER_SEC ) {
- step();
- if ( interrupted && interrupted() )
- return secs;
- cpu_nap();
- }
- start = now;
- }
-
- return 0;
- }
-
- /**
- * Check if sleep has been interrupted by keypress
- *
- * @ret interrupted Sleep has been interrupted
- */
- static int keypress_interrupted ( void ) {
-
- return ( iskey() && ( getchar() == CTRL_C ) );
- }
-
- /**
- * Sleep (interruptibly) for a fixed number of seconds
- *
- * @v secs Number of seconds for which to delay
- * @ret secs Number of seconds remaining, if interrupted
- */
- unsigned int sleep ( unsigned int secs ) {
-
- return sleep_interruptible ( secs, keypress_interrupted );
- }
-
- /**
- * Sleep (uninterruptibly) for a fixed number of seconds
- *
- * @v secs Number of seconds for which to delay
- */
- void sleep_fixed ( unsigned int secs ) {
-
- sleep_interruptible ( secs, NULL );
- }
-
- /**
- * Find a working timer
- *
- */
- static void timer_probe ( void ) {
- int rc;
-
- /* Use first working timer */
- for_each_table_entry ( timer, TIMERS ) {
- if ( ( timer->probe == NULL ) ||
- ( ( rc = timer->probe() ) == 0 ) ) {
- DBGC ( &timer, "TIMER using %s\n", timer->name );
- return;
- }
- DBGC ( &timer, "TIMER could not initialise %s: %s\n",
- timer->name, strerror ( rc ) );
- }
-
- /* This is a fatal error */
- DBGC ( &timer, "TIMER found no working timers!\n" );
- while ( 1 ) {}
- }
-
- /** Timer initialisation function */
- struct init_fn timer_init_fn __init_fn ( INIT_EARLY ) = {
- .initialise = timer_probe,
- };
-
- /* Drag in timer configuration */
- REQUIRING_SYMBOL ( timer_init_fn );
- REQUIRE_OBJECT ( config_timer );
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