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 SHARE_GC_Z_ZPHYSICALMEMORY_HPP
  25 #define SHARE_GC_Z_ZPHYSICALMEMORY_HPP
  26 
  27 #include "gc/z/zMemory.hpp"
  28 #include "memory/allocation.hpp"
  29 #include OS_HEADER(gc/z/zBackingFile)
  30 
  31 class ZPhysicalMemorySegment : public CHeapObj<mtGC> {
  32 private:
  33   uintptr_t _start;
  34   uintptr_t _end;
  35 
  36 public:
  37   ZPhysicalMemorySegment();
  38   ZPhysicalMemorySegment(uintptr_t start, size_t size);
  39 
  40   uintptr_t start() const;
  41   uintptr_t end() const;
  42   size_t size() const;
  43 };
  44 
  45 class ZPhysicalMemory {
  46 private:
  47   size_t                  _nsegments;
  48   ZPhysicalMemorySegment* _segments;
  49 
  50 public:
  51   ZPhysicalMemory();
  52   ZPhysicalMemory(const ZPhysicalMemorySegment& segment);
  53   ZPhysicalMemory(const ZPhysicalMemory& pmem);
  54   const ZPhysicalMemory& operator=(const ZPhysicalMemory& pmem);
  55   ~ZPhysicalMemory();
  56 
  57   bool is_null() const;
  58   size_t size() const;
  59 
  60   size_t nsegments() const;
  61   const ZPhysicalMemorySegment& segment(size_t index) const;
  62   void add_segment(const ZPhysicalMemorySegment& segment);
  63 
  64   ZPhysicalMemory split(size_t size);
  65 };
  66 
  67 class ZPhysicalMemoryManager {
  68 private:
  69   ZBackingFile   _file;
  70   ZMemoryManager _committed;
  71   ZMemoryManager _uncommitted;
  72 
  73   void nmt_commit(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  74   void nmt_uncommit(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  75 
  76   void pretouch_view(uintptr_t addr, size_t size) const;
  77   void map_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;
  78   void unmap_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;
  79 
  80 public:
  81   bool is_initialized() const;
  82 
  83   void warn_commit_limits(size_t max) const;
  84   bool supports_uncommit();
  85 
  86   size_t commit(size_t size);
  87   size_t uncommit(size_t size);
  88 
  89   ZPhysicalMemory alloc(size_t size);
  90   void free(const ZPhysicalMemory& pmem);
  91 
  92   void pretouch(uintptr_t offset, size_t size) const;
  93 
  94   void map(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  95   void unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  96 
  97   void debug_map(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  98   void debug_unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  99 };
 100 
 101 #endif // SHARE_GC_Z_ZPHYSICALMEMORY_HPP