1/*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#ifndef OS_CPU_LINUX_X86_OS_LINUX_X86_HPP
26#define OS_CPU_LINUX_X86_OS_LINUX_X86_HPP
27
28 static void setup_fpu();
29 static bool supports_sse();
30
31 static jlong rdtsc();
32
33 static bool is_allocatable(size_t bytes);
34
35 // Used to register dynamic code cache area with the OS
36 // Note: Currently only used in 64 bit Windows implementations
37 static bool register_code_area(char *low, char *high) { return true; }
38
39 /*
40 * Work-around for broken NX emulation using CS limit, Red Hat patch "Exec-Shield"
41 * (IA32 only).
42 *
43 * Map and execute at a high VA to prevent CS lazy updates race with SMP MM
44 * invalidation.Further code generation by the JVM will no longer cause CS limit
45 * updates.
46 *
47 * Affects IA32: RHEL 5 & 6, Ubuntu 10.04 (LTS), 10.10, 11.04, 11.10, 12.04.
48 * @see JDK-8023956
49 */
50 static void workaround_expand_exec_shield_cs_limit();
51
52#endif // OS_CPU_LINUX_X86_OS_LINUX_X86_HPP
53