1 /*
   2  * Copyright (c) 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_BSD_GC_Z_ZPHYSICALMEMORYBACKING_BSD_HPP
  25 #define OS_BSD_GC_Z_ZPHYSICALMEMORYBACKING_BSD_HPP
  26 
  27 #include "gc/z/zBackingFile_bsd.hpp"
  28 #include "gc/z/zMemory.hpp"
  29 
  30 class ZPhysicalMemory;
  31 
  32 class ZPhysicalMemoryBacking {
  33 private:
  34   ZBackingFile   _file;
  35   ZMemoryManager _committed;
  36   ZMemoryManager _uncommitted;
  37 
  38   void pretouch_view(uintptr_t addr, size_t size) const;
  39   void map_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;
  40   void unmap_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;
  41 
  42 public:
  43   bool is_initialized() const;
  44 
  45   void warn_commit_limits(size_t max) const;
  46   bool supports_uncommit();
  47 
  48   size_t commit(size_t size);
  49   size_t uncommit(size_t size);
  50 
  51   ZPhysicalMemory alloc(size_t size);
  52   void free(const ZPhysicalMemory& pmem);
  53 
  54   uintptr_t nmt_address(uintptr_t offset) const;
  55 
  56   void pretouch(uintptr_t offset, size_t size) const;
  57 
  58   void map(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  59   void unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  60 
  61   void debug_map(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  62   void debug_unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;
  63 };
  64 
  65 #endif // OS_BSD_GC_Z_ZPHYSICALMEMORYBACKING_BSD_HPP