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   ZBackingFile   _file;

    36   ZMemoryManager _committed;

    37   ZMemoryManager _uncommitted;

    38 

    39   void warn_available_space(size_t max) const;

    40   void warn_max_map_count(size_t max) const;

    41 

    42   void map_failed(ZErrno err) const;

    43 

    44   void advise_view(uintptr_t addr, size_t size, int advice) const;

    45   void pretouch_view(uintptr_t addr, size_t size) const;

    46   void map_view(const ZPhysicalMemory& pmem, uintptr_t addr, bool pretouch) const;

    47   void unmap_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;

    48 

    49 public:

    50   bool is_initialized() const;

    51 

    52   void warn_commit_limits(size_t max) const;

    53   bool supports_uncommit();

    54 

    55   size_t commit(size_t size);

    56   size_t uncommit(size_t size);

    57 

    58   ZPhysicalMemory alloc(size_t size);

    59   void free(const ZPhysicalMemory& pmem);

    60 

    61   uintptr_t nmt_address(uintptr_t offset) const;

    62 

    63   void map(const ZPhysicalMemory& pmem, uintptr_t offset) const;

    64   void unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;

    65 

    66   void debug_map(const ZPhysicalMemory& pmem, uintptr_t offset) const;

    67   void debug_unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;

    68 };

    69 

    70 #endif // OS_CPU_LINUX_X86_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_X86_HPP