/*

 * Copyright (c) 2006, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "logging/log.hpp"

#include "precompiled.hpp"

#include "runtime/os.hpp"

#include "vm_version_sparc.hpp"

static bool cpuinfo_field_contains(const char* field, const char* value) {

  char line[1024];

  bool rv = false;

  FILE* fp = fopen("/proc/cpuinfo", "r");

  if (fp == NULL) {

    return rv;

  }

  while (fgets(line, sizeof(line), fp) != NULL) {

    assert(strlen(line) < sizeof(line) - 1, "buffer line[1024] is too small.");

    if (strncmp(line, field, strlen(field)) == 0) {

      if (strstr(line, value) != NULL) {

        rv = true;

      }

      break;

    }

  }

  fclose(fp);

  return rv;

}

static bool detect_niagara() {

  return cpuinfo_field_contains("cpu", "Niagara");

}

static bool detect_M_family() {

  return cpuinfo_field_contains("cpu", "SPARC-M");

}

static bool detect_blkinit() {

  return cpuinfo_field_contains("cpucaps", "blkinit");

}

int VM_Version::platform_features(int features) {

  // Default to generic v9

  features = generic_v9_m;

  if (detect_niagara()) {

    log_info(os, cpu)("Detected Linux on Niagara");

    features = niagara1_m | T_family_m;

  }

  if (detect_M_family()) {

    log_info(os, cpu)("Detected Linux on M family");

    features = sun4v_m | generic_v9_m | M_family_m | T_family_m;

  }

  if (detect_blkinit()) {

    features |= blk_init_instructions_m;

  }

  return features;

}