1 /*
   2  * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2007, 2008, 2010, 2018, 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) && !defined(__SPE__)
  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(PPC32) && defined(__SPE__)
  46     long tmp;
  47     asm volatile ("evldd  %0, %2\n"
  48                   "evstdd %0, %1\n"
  49                   : "=&r"(tmp), "=Q"(*(volatile long*)dst)
  50                   : "Q"(*(volatile long*)src));
  51 #elif defined(S390) && !defined(_LP64)
  52     double tmp;
  53     asm volatile ("ld  %0, %2\n"
  54                   "std %0, %1\n"
  55                   : "=&f"(tmp), "=Q"(*(volatile double*)dst)
  56                   : "Q"(*(volatile double*)src));
  57 #else
  58     *(jlong *) dst = *(const jlong *) src;
  59 #endif
  60   }
  61 
  62 #endif // OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP