1 /*

     2  * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.

     3  * Copyright 2007, 2008, 2010 Red Hat, Inc.

     4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     5  *

     6  * This code is free software; you can redistribute it and/or modify it

     7  * under the terms of the GNU General Public License version 2 only, as

     8  * published by the Free Software Foundation.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  *

    24  */

    25 

    26 #ifndef OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP

    27 #define OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP

    28 

    29   static void setup_fpu() {}

    30 

    31   static bool is_allocatable(size_t bytes);

    32 

    33   // Used to register dynamic code cache area with the OS

    34   // Note: Currently only used in 64 bit Windows implementations

    35   static bool register_code_area(char *low, char *high) { return true; }

    36 

    37   // Atomically copy 64 bits of data

    38   static void atomic_copy64(const volatile void *src, volatile void *dst) {

    39 #if defined(PPC32)

    40     double tmp;

    41     asm volatile ("lfd  %0, %2\n"

    42                   "stfd %0, %1\n"

    43                   : "=&f"(tmp), "=Q"(*(volatile double*)dst)

    44                   : "Q"(*(volatile double*)src));

    45 #elif defined(S390) && !defined(_LP64)

    46     double tmp;

    47     asm volatile ("ld  %0, 0(%1)\n"

    48                   "std %0, 0(%2)\n"

    49                   : "=r"(tmp)

    50                   : "a"(src), "a"(dst));

    51 #else

    52     *(jlong *) dst = *(const jlong *) src;

    53 #endif

    54   }

    55 

    56 #endif // OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP