1 /* 2 * Copyright (c) 2015, 2020, 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 #ifndef SHARE_GC_Z_ZVIRTUALMEMORY_HPP 25 #define SHARE_GC_Z_ZVIRTUALMEMORY_HPP 26 27 #include "gc/z/zMemory.hpp" 28 29 class ZVirtualMemory { 30 friend class VMStructs; 31 32 private: 33 uintptr_t _start; 34 uintptr_t _end; 35 36 public: 37 ZVirtualMemory(); 38 ZVirtualMemory(uintptr_t start, size_t size); 39 40 bool is_null() const; 41 uintptr_t start() const; 42 uintptr_t end() const; 43 size_t size() const; 44 45 ZVirtualMemory split(size_t size); 46 }; 47 48 class ZVirtualMemoryManager { 49 private: 50 ZMemoryManager _manager; 51 bool _initialized; 52 size_t _address_bits_seen; 53 54 void initialize_os(); 55 56 bool reserve_contiguous_platform(uintptr_t start, size_t size); 57 bool reserve_contiguous(size_t size); 58 size_t reserve_discontiguous(uintptr_t start, size_t size, size_t min_range); 59 size_t reserve_discontiguous(size_t size); 60 bool reserve(size_t max_capacity); 61 62 void nmt_reserve(uintptr_t start, size_t size); 63 64 public: 65 ZVirtualMemoryManager(size_t max_capacity); 66 67 bool is_initialized() const; 68 69 ZVirtualMemory alloc(size_t size, bool force_low_address); 70 void free(const ZVirtualMemory& vmem); 71 }; 72 73 #endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP