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[timer] Formalise the timer API

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We now have two implementations for the timer API: one using the
time-of-day counter at 40:70 and one using RDTSC.  Both make use of
timer2_udelay().
This commit is contained in:
Michael Brown
2008-10-12 19:56:52 +01:00
parent e6f276ece3
commit 16f1e35775
22 changed files with 386 additions and 284 deletions
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91
src/core/timer.c
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@@ -1,7 +1,5 @@
/*
* core/timer.c
*
* Copyright (C) 2007 Alexey Zaytsev <alexey.zaytsev@gmail.com>
* 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
@@ -18,96 +16,25 @@
* 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 );
}
#include <unistd.h>
/**
* Identify timer source
* Delay for a fixed number of milliseconds
*
* @ret timer Timer source
* @v msecs Number of milliseconds for which to delay
*/
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 ) {
void mdelay ( unsigned long msecs ) {
while ( msecs-- )
udelay ( USECS_IN_MSEC );
udelay ( 1000 );
}
/**
* Delay
* Delay for a fixed number of seconds
*
* @v secs Time to delay, in seconds
* @v secs Number of seconds for which to delay
*/
unsigned int sleep ( unsigned int secs ) {
while ( secs-- )
mdelay ( MSECS_IN_SEC );
mdelay ( 1000 );
return 0;
}