9778b7b790
git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@2 315a16e6-25f9-4109-90ae-ca3045a26c18
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/*
|
|
* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
|
|
* RWTH Aachen University
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is part of MetalSVM.
|
|
*/
|
|
|
|
#include <metalsvm/stddef.h>
|
|
#include <metalsvm/stdio.h>
|
|
#include <metalsvm/time.h>
|
|
#include <metalsvm/processor.h>
|
|
|
|
static int cpu_freq = 0;
|
|
|
|
int detect_cpu_frequency(void)
|
|
{
|
|
uint64_t start, end;
|
|
|
|
start = rdtsc();
|
|
timer_wait(1*timer_get_frequency());
|
|
end = rdtsc();
|
|
|
|
cpu_freq = end - start;
|
|
|
|
return cpu_freq;
|
|
}
|
|
|
|
int get_cpu_frequency(void)
|
|
{
|
|
if (cpu_freq > 0)
|
|
return cpu_freq;
|
|
|
|
return detect_cpu_frequency();
|
|
}
|
|
|
|
void udelay(unsigned int usecs)
|
|
{
|
|
uint64_t start = rdtsc();
|
|
uint64_t deadline = (get_cpu_frequency()*usecs)/1000000;
|
|
|
|
while(rdtsc() - start < deadline)
|
|
;
|
|
}
|