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/*
* LIBOIL - Library of Optimized Inner Loops
* Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <liboil/liboilfunction.h>
#include <liboil/liboildebug.h>
#include <liboil/liboilcpu.h>
#include <liboil/liboilfault.h>
#include <liboil/liboilutils.h>
#if defined(__linux__)
#include <linux/auxvec.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#ifndef PPC_FEATURE_HAS_ALTIVEC
/* From linux-2.6/include/asm-powerpc/cputable.h */
#define PPC_FEATURE_HAS_ALTIVEC 0x10000000
#endif
#endif
#if defined(__APPLE__)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#if defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
/***** powerpc *****/
static unsigned long
oil_profile_stamp_tb(void)
{
unsigned long ts;
__asm__ __volatile__("mftb %0\n" : "=r" (ts));
return ts;
}
#if !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined(__APPLE__) && !defined(__linux__)
static void
test_altivec (void * ignored)
{
asm volatile ("vor v0, v0, v0\n");
}
#endif
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
static void
oil_check_altivec_sysctl_freebsd (void)
{
int ret, av;
size_t len;
len = sizeof(av);
ret = sysctlbyname("hw.altivec", &av, &len, NULL, 0);
if (!ret && av) {
oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
}
}
#endif
#if defined(__APPLE__)
static void
oil_check_altivec_sysctl_darwin (void)
{
int ret, vu;
size_t len;
len = sizeof(vu);
ret = sysctlbyname("hw.vectorunit", &vu, &len, NULL, 0);
if (!ret && vu) {
oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
}
}
#endif
#if defined(__linux__)
static void
oil_check_altivec_proc_auxv (void)
{
static int available = -1;
int new_avail = 0;
unsigned long buf[64];
ssize_t count;
int fd, i;
/* Flags already set */
if (available != -1) {
return;
}
fd = open("/proc/self/auxv", O_RDONLY);
if (fd < 0) {
goto out;
}
more:
count = read(fd, buf, sizeof(buf));
if (count < 0) {
goto out_close;
}
for (i=0; i < (count / sizeof(unsigned long)); i += 2) {
if (buf[i] == AT_HWCAP) {
new_avail = !!(buf[i+1] & PPC_FEATURE_HAS_ALTIVEC);
goto out_close;
} else if (buf[i] == AT_NULL) {
goto out_close;
}
}
if (count == sizeof(buf)) {
goto more;
}
out_close:
close(fd);
out:
available = new_avail;
if (available) {
oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
}
}
#endif
#if !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined(__APPLE__) && !defined(__linux__)
static void
oil_check_altivec_fault (void)
{
oil_fault_check_enable ();
if (oil_fault_check_try(test_altivec, NULL)) {
OIL_DEBUG ("cpu flag altivec");
oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
}
oil_fault_check_disable ();
}
#endif
void
oil_cpu_detect_arch(void)
{
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
oil_check_altivec_sysctl_freebsd();
#elif defined(__APPLE__)
oil_check_altivec_sysctl_darwin();
#elif defined(__linux__)
oil_check_altivec_proc_auxv();
#else
oil_check_altivec_fault();
#endif
_oil_profile_stamp = oil_profile_stamp_tb;
}
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