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_ZPHYSICALMEMORY_HPP 25 #define SHARE_GC_Z_ZPHYSICALMEMORY_HPP 26 27 #include "gc/z/zArray.hpp" 28 #include "gc/z/zMemory.hpp" 29 #include "memory/allocation.hpp" 30 #include OS_HEADER(gc/z/zPhysicalMemoryBacking) 31 32 class ZPhysicalMemorySegment : public CHeapObj<mtGC> { 33 private: 34 uintptr_t _start; 35 uintptr_t _end; 36 bool _committed; 37 38 public: 39 ZPhysicalMemorySegment(); 40 ZPhysicalMemorySegment(uintptr_t start, size_t size, bool committed); 41 42 uintptr_t start() const; 43 uintptr_t end() const; 44 size_t size() const; 45 46 bool is_committed() const; 47 void set_committed(bool committed); 48 }; 49 50 class ZPhysicalMemory { 51 private: 52 ZArray<ZPhysicalMemorySegment> _segments; 53 54 void insert_segment(int index, uintptr_t start, size_t size, bool committed); 55 void replace_segment(int index, uintptr_t start, size_t size, bool committed); 56 void remove_segment(int index); 57 58 public: 59 ZPhysicalMemory(); 60 ZPhysicalMemory(const ZPhysicalMemorySegment& segment); 61 ZPhysicalMemory(const ZPhysicalMemory& pmem); 62 const ZPhysicalMemory& operator=(const ZPhysicalMemory& pmem); 63 64 bool is_null() const; 65 size_t size() const; 66 67 int nsegments() const; 68 const ZPhysicalMemorySegment& segment(int index) const; 69 70 void add_segments(const ZPhysicalMemory& pmem); 71 void remove_segments(); 72 73 void add_segment(const ZPhysicalMemorySegment& segment); 74 bool commit_segment(int index, size_t size); 75 bool uncommit_segment(int index, size_t size); 76 77 ZPhysicalMemory split(size_t size); 78 ZPhysicalMemory split_committed(); 79 }; 80 81 class ZPhysicalMemoryManager { 82 private: 83 ZPhysicalMemoryBacking _backing; 84 ZMemoryManager _manager; 85 86 void nmt_commit(uintptr_t offset, size_t size) const; 87 void nmt_uncommit(uintptr_t offset, size_t size) const; 88 89 void pretouch_view(uintptr_t addr, size_t size) const; 90 void map_view(uintptr_t addr, const ZPhysicalMemory& pmem) const; 91 void unmap_view(uintptr_t addr, size_t size) const; 92 93 public: 94 ZPhysicalMemoryManager(size_t max_capacity); 95 96 bool is_initialized() const; 97 98 void warn_commit_limits(size_t max_capacity) const; 99 void try_enable_uncommit(size_t min_capacity, size_t max_capacity); 100 101 void alloc(ZPhysicalMemory& pmem, size_t size); 102 void free(const ZPhysicalMemory& pmem); 103 104 bool commit(ZPhysicalMemory& pmem); 105 bool uncommit(ZPhysicalMemory& pmem); 106 107 void pretouch(uintptr_t offset, size_t size) const; 108 109 void map(uintptr_t offset, const ZPhysicalMemory& pmem) const; 110 void unmap(uintptr_t offset, size_t size) const; 111 112 void debug_map(uintptr_t offset, const ZPhysicalMemory& pmem) const; 113 void debug_unmap(uintptr_t offset, size_t size) const; 114 }; 115 116 #endif // SHARE_GC_Z_ZPHYSICALMEMORY_HPP