os_linux_x86.inline.hpp revision 2943:7ab5f6318694
1/* 2 * Copyright (c) 2011, 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_VM_OS_LINUX_X86_INLINE_HPP 26#define OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP 27 28#include "runtime/os.hpp" 29 30// See http://www.technovelty.org/code/c/reading-rdtsc.htl for details 31inline jlong os::rdtsc() { 32#ifndef AMD64 33 // 64 bit result in edx:eax 34 uint64_t res; 35 __asm__ __volatile__ ("rdtsc" : "=A" (res)); 36 return (jlong)res; 37#else 38 uint64_t res; 39 uint32_t ts1, ts2; 40 __asm__ __volatile__ ("rdtsc" : "=a" (ts1), "=d" (ts2)); 41 res = ((uint64_t)ts1 | (uint64_t)ts2 << 32); 42 return (jlong)res; 43#endif // AMD64 44} 45 46#endif // OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP 47