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 #ifndef OS_CPU_LINUX_X86_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_X86_HPP 25 #define OS_CPU_LINUX_X86_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_X86_HPP 26 27 #include "gc/z/zBackingFile_linux_x86.hpp" 28 #include "gc/z/zMemory.hpp" 29 30 class ZErrno; 31 class ZPhysicalMemory; 32 33 class ZPhysicalMemoryBacking { 34 private: 35 ZMemoryManager _manager; 36 ZBackingFile _file; 37 38 void check_max_map_count(size_t max_capacity) const; 39 void check_available_space_on_filesystem(size_t max_capacity) const; 40 void map_failed(ZErrno err) const; 41 42 void advise_view(uintptr_t addr, size_t size) const; 43 void pretouch_view(uintptr_t addr, size_t size) const; 44 void map_view(ZPhysicalMemory pmem, uintptr_t addr, bool pretouch) const; 45 void unmap_view(ZPhysicalMemory pmem, uintptr_t addr) const; 46 47 public: 48 ZPhysicalMemoryBacking(size_t max_capacity); 49 50 bool is_initialized() const; 51 52 size_t try_expand(size_t old_capacity, size_t new_capacity); 53 54 ZPhysicalMemory alloc(size_t size); 55 void free(ZPhysicalMemory pmem); 56 57 uintptr_t nmt_address(uintptr_t offset) const; 58 59 void map(ZPhysicalMemory pmem, uintptr_t offset) const; 60 void unmap(ZPhysicalMemory pmem, uintptr_t offset) const; 61 void flip(ZPhysicalMemory pmem, uintptr_t offset) const; 62 }; 63 64 #endif // OS_CPU_LINUX_X86_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_X86_HPP