/*

 * 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;

}