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annotate src/os_cpu/linux_x86/vm/os_linux_x86.hpp @ 17524:89152779163c

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Merge with jdk8-b132
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 11:59:32 +0200
parents 4ca6dc0799b6
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1 /*
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef OS_CPU_LINUX_X86_VM_OS_LINUX_X86_HPP
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26 #define OS_CPU_LINUX_X86_VM_OS_LINUX_X86_HPP
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27
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28 static void setup_fpu();
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29 static bool supports_sse();
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30
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31 static jlong rdtsc();
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33 static bool is_allocatable(size_t bytes);
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34
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35 // Used to register dynamic code cache area with the OS
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36 // Note: Currently only used in 64 bit Windows implementations
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37 static bool register_code_area(char *low, char *high) { return true; }
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38
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39 /*
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40 * Work-around for broken NX emulation using CS limit, Red Hat patch "Exec-Shield"
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41 * (IA32 only).
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42 *
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43 * Map and execute at a high VA to prevent CS lazy updates race with SMP MM
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44 * invalidation.Further code generation by the JVM will no longer cause CS limit
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45 * updates.
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46 *
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47 * Affects IA32: RHEL 5 & 6, Ubuntu 10.04 (LTS), 10.10, 11.04, 11.10, 12.04.
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48 * @see JDK-8023956
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49 */
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50 static void workaround_expand_exec_shield_cs_limit();
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52 #endif // OS_CPU_LINUX_X86_VM_OS_LINUX_X86_HPP