1 /* 2 * Copyright (c) 2015, 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 #include "precompiled.hpp" 25 #include "gc/z/zAddress.inline.hpp" 26 #include "gc/z/zVirtualMemory.hpp" 27 #include "logging/log.hpp" 28 29 #include <sys/mman.h> 30 #include <sys/types.h> 31 32 void ZVirtualMemoryManager::initialize_os() { 33 // Does nothing 34 } 35 36 static void unmap(uintptr_t start, size_t size) { 37 const int res = munmap((void*)start, size); 38 assert(res == 0, "Failed to unmap memory"); 39 } 40 41 static bool map(uintptr_t start, size_t size) { 42 const void* const res = mmap((void*)start, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0); 43 if (res == MAP_FAILED) { 44 // Failed to reserve memory 45 return false; 46 } 47 48 if ((uintptr_t)res != start) { 49 // Failed to reserve memory at the requested address 50 unmap((uintptr_t)res, size); 51 return false; 52 } 53 54 // Success 55 return true; 56 } 57 58 bool ZVirtualMemoryManager::reserve_contiguous_platform(uintptr_t start, size_t size) { 59 // Reserve address views 60 const uintptr_t marked0 = ZAddress::marked0(start); 61 const uintptr_t marked1 = ZAddress::marked1(start); 62 const uintptr_t remapped = ZAddress::remapped(start); 63 64 if (!map(marked0, size)) { 65 return false; 66 } 67 68 if (!map(marked1, size)) { 69 unmap(marked0, size); 70 return false; 71 } 72 73 if (!map(remapped, size)) { 74 unmap(marked0, size); 75 unmap(marked1, size); 76 return false; 77 } 78 79 // Register address views with native memory tracker 80 nmt_reserve(marked0, size); 81 nmt_reserve(marked1, size); 82 nmt_reserve(remapped, size); 83 84 return true; 85 }