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/*
* Copyright (c) 2013, Intel Corporation
* Copyright (c) 2017, IBM Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "../common/include/os/os_util.h"
#define KERNEL_ADDR_START 0xffffffff80000000
/*
* Get the TSC cycles.
*/
#ifdef __x86_64__
uint64_t
rdtsc(void)
{
uint64_t var;
uint32_t hi, lo;
__asm volatile
("rdtsc" : "=a" (lo), "=d" (hi));
/* LINTED E_VAR_USED_BEFORE_SET */
var = ((uint64_t)hi << 32) | lo;
return (var);
}
#else
uint64_t
rdtsc(void)
{
uint64_t var;
__asm volatile
("rdtsc" : "=A" (var));
return (var);
}
#endif
/*
* Check the cpu name in proc info. Intel CPUs always have @ x.y
* GHz and that is the TSC frequency. AMD CPUs do not advertise
* clock frequency as a part of the model name.
*/
int
arch__cpuinfo_freq(double *freq, char *unit)
{
FILE *f;
char *line = NULL;
size_t idx, len = 0;
int ret = -1;
if ((f = fopen(CPUINFO_PATH, "r")) == NULL) {
return (-1);
}
while ((len = getline(&line, &len, f)) > 0) {
if (strncmp(line, "model name", sizeof ("model name") - 1) != 0) {
continue;
}
idx = strcspn(line, "@") + 1;
/*
* The model name will not change for other processors. So
* bail out if "@" is not found.
*/
if (idx >= len)
break;
if (sscanf(line + idx, "%lf%10s", freq, unit) == 2) {
if (strcasecmp(unit, "GHz") == 0) {
*freq *= GHZ;
} else if (strcasecmp(unit, "Mhz") == 0) {
*freq *= MHZ;
}
ret = 0;
break;
}
}
free(line);
fclose(f);
return ret;
}
int
is_userspace(uint64_t ip)
{
return ip < KERNEL_ADDR_START;
}
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