40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
|
/* millisleep.c - generic millisleep function.
|
||
|
|
* The generic implementation of these functions can be used for architectures
|
||
|
|
* or platforms that do not have a more specialized implementation. */
|
||
|
|
/*
|
||
|
|
* GRUB -- GRand Unified Bootloader
|
||
|
|
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008 Free Software Foundation, Inc.
|
||
|
|
*
|
||
|
|
* GRUB 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 3 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <grub/misc.h>
|
||
|
|
#include <grub/time.h>
|
||
|
|
|
||
|
|
void
|
||
|
|
grub_millisleep (grub_uint32_t ms)
|
||
|
|
{
|
||
|
|
grub_uint64_t start;
|
||
|
|
|
||
|
|
start = grub_get_time_ms ();
|
||
|
|
|
||
|
|
/* Instead of setting an end time and looping while the current time is
|
||
|
|
less than that, comparing the elapsed sleep time with the desired sleep
|
||
|
|
time handles the (unlikely!) case that the timer would wrap around
|
||
|
|
during the sleep. */
|
||
|
|
|
||
|
|
while (grub_get_time_ms () - start < ms)
|
||
|
|
grub_cpu_idle ();
|
||
|
|
}
|