57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
/*
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* Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2007, 2008, 2010 Red Hat, Inc.
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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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#ifndef OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP
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#define OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP
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static void setup_fpu() {}
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static bool is_allocatable(size_t bytes);
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// Used to register dynamic code cache area with the OS
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// Note: Currently only used in 64 bit Windows implementations
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static bool register_code_area(char *low, char *high) { return true; }
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// Atomically copy 64 bits of data
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static void atomic_copy64(const volatile void *src, volatile void *dst) {
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#if defined(PPC32)
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double tmp;
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asm volatile ("lfd %0, %2\n"
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"stfd %0, %1\n"
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: "=&f"(tmp), "=Q"(*(volatile double*)dst)
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: "Q"(*(volatile double*)src));
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#elif defined(S390) && !defined(_LP64)
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double tmp;
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asm volatile ("ld %0, 0(%1)\n"
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"std %0, 0(%2)\n"
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: "=r"(tmp)
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: "a"(src), "a"(dst));
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#else
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*(jlong *) dst = *(const jlong *) src;
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#endif
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}
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#endif // OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP
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