src/hotspot/os_cpu/linux_sparc/vm_version_linux_sparc.cpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
changeset 47216 71c04702a3d5
parent 46666 hotspot/src/os_cpu/linux_sparc/vm/vm_version_linux_sparc.cpp@32434b633549
child 47772 71ad0eec75e8
permissions -rw-r--r--
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/*
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 * Copyright (c) 2006, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "logging/log.hpp"
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#include "precompiled.hpp"
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#include "runtime/os.hpp"
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#include "vm_version_sparc.hpp"
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static bool cpuinfo_field_contains(const char* field, const char* value) {
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  char line[1024];
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  bool rv = false;
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  FILE* fp = fopen("/proc/cpuinfo", "r");
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  if (fp == NULL) {
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    return rv;
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  }
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  while (fgets(line, sizeof(line), fp) != NULL) {
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    assert(strlen(line) < sizeof(line) - 1, "buffer line[1024] is too small.");
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    if (strncmp(line, field, strlen(field)) == 0) {
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      if (strstr(line, value) != NULL) {
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        rv = true;
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      }
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      break;
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    }
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  }
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  fclose(fp);
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  return rv;
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}
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static bool detect_niagara() {
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  return cpuinfo_field_contains("cpu", "Niagara");
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}
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static bool detect_M_family() {
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  return cpuinfo_field_contains("cpu", "SPARC-M");
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}
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static bool detect_blkinit() {
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  return cpuinfo_field_contains("cpucaps", "blkinit");
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}
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int VM_Version::platform_features(int features) {
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  // Default to generic v9
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  features = generic_v9_m;
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  if (detect_niagara()) {
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    log_info(os, cpu)("Detected Linux on Niagara");
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    features = niagara1_m | T_family_m;
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  }
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  if (detect_M_family()) {
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    log_info(os, cpu)("Detected Linux on M family");
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    features = sun4v_m | generic_v9_m | M_family_m | T_family_m;
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  }
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  if (detect_blkinit()) {
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    features |= blk_init_instructions_m;
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  }
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  return features;
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}