74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
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/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#ifndef SHARE_GC_Z_ZPAGETABLEENTRY_HPP
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#define SHARE_GC_Z_ZPAGETABLEENTRY_HPP
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#include "gc/z/zBitField.hpp"
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#include "memory/allocation.hpp"
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//
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// Page table entry layout
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// -----------------------
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//
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// 6
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// 3 1 0
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// +----------------------------------------------------------------------+-+
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// |11111111 11111111 11111111 11111111 11111111 11111111 11111111 1111111|1|
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// +----------------------------------------------------------------------+-+
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// | |
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// | 0-0 Relocating Flag (1-bit) *
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// |
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// |
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// |
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// * 63-1 Page address (63-bits)
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//
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class ZPage;
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class ZPageTableEntry {
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private:
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typedef ZBitField<uint64_t, bool, 0, 1> field_relocating;
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typedef ZBitField<uint64_t, ZPage*, 1, 63, 1> field_page;
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uint64_t _entry;
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public:
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ZPageTableEntry() :
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_entry(0) {}
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ZPageTableEntry(ZPage* page, bool relocating) :
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_entry(field_page::encode(page) |
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field_relocating::encode(relocating)) {}
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bool relocating() const {
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return field_relocating::decode(_entry);
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}
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ZPage* page() const {
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return field_page::decode(_entry);
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}
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};
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#endif // SHARE_GC_Z_ZPAGETABLEENTRY_HPP
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