1 /* 2 * Copyright (c) 2017, 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 #include "precompiled.hpp" 25 #include "gc/z/zGlobals.hpp" 26 #include "gc/z/zUtils.inline.hpp" 27 #include "runtime/globals.hpp" 28 #include "utilities/globalDefinitions.hpp" 29 30 // 31 // The heap can have three different layouts, depending on the max heap size. 32 // 33 // Address Space & Pointer Layout 1 34 // -------------------------------- 35 // 36 // +--------------------------------+ 0x00007FFFFFFFFFFF (127TB) 37 // . . 38 // . . 39 // . . 40 // +--------------------------------+ 0x0000014000000000 (20TB) 41 // | Remapped View | 42 // +--------------------------------+ 0x0000010000000000 (16TB) 43 // . . 44 // +--------------------------------+ 0x00000c0000000000 (12TB) 45 // | Marked1 View | 46 // +--------------------------------+ 0x0000080000000000 (8TB) 47 // | Marked0 View | 48 // +--------------------------------+ 0x0000040000000000 (4TB) 49 // . . 50 // +--------------------------------+ 0x0000000000000000 51 // 52 // 6 4 4 4 4 53 // 3 6 5 2 1 0 54 // +--------------------+----+-----------------------------------------------+ 55 // |00000000 00000000 00|1111|11 11111111 11111111 11111111 11111111 11111111| 56 // +--------------------+----+-----------------------------------------------+ 57 // | | | 58 // | | * 41-0 Object Offset (42-bits, 4TB address space) 59 // | | 60 // | * 45-42 Metadata Bits (4-bits) 0001 = Marked0 (Address view 4-8TB) 61 // | 0010 = Marked1 (Address view 8-12TB) 62 // | 0100 = Remapped (Address view 16-20TB) 63 // | 1000 = Finalizable (Address view N/A) 64 // | 65 // * 63-46 Fixed (18-bits, always zero) 66 // 67 // 68 // Address Space & Pointer Layout 2 69 // -------------------------------- 70 // 71 // +--------------------------------+ 0x00007FFFFFFFFFFF (127TB) 72 // . . 73 // . . 74 // . . 75 // +--------------------------------+ 0x0000280000000000 (40TB) 76 // | Remapped View | 77 // +--------------------------------+ 0x0000200000000000 (32TB) 78 // . . 79 // +--------------------------------+ 0x0000180000000000 (24TB) 80 // | Marked1 View | 81 // +--------------------------------+ 0x0000100000000000 (16TB) 82 // | Marked0 View | 83 // +--------------------------------+ 0x0000080000000000 (8TB) 84 // . . 85 // +--------------------------------+ 0x0000000000000000 86 // 87 // 6 4 4 4 4 88 // 3 7 6 3 2 0 89 // +------------------+-----+------------------------------------------------+ 90 // |00000000 00000000 0|1111|111 11111111 11111111 11111111 11111111 11111111| 91 // +-------------------+----+------------------------------------------------+ 92 // | | | 93 // | | * 42-0 Object Offset (43-bits, 8TB address space) 94 // | | 95 // | * 46-43 Metadata Bits (4-bits) 0001 = Marked0 (Address view 8-16TB) 96 // | 0010 = Marked1 (Address view 16-24TB) 97 // | 0100 = Remapped (Address view 32-40TB) 98 // | 1000 = Finalizable (Address view N/A) 99 // | 100 // * 63-47 Fixed (17-bits, always zero) 101 // 102 // 103 // Address Space & Pointer Layout 3 104 // -------------------------------- 105 // 106 // +--------------------------------+ 0x00007FFFFFFFFFFF (127TB) 107 // . . 108 // . . 109 // . . 110 // +--------------------------------+ 0x0000500000000000 (80TB) 111 // | Remapped View | 112 // +--------------------------------+ 0x0000400000000000 (64TB) 113 // . . 114 // +--------------------------------+ 0x0000300000000000 (48TB) 115 // | Marked1 View | 116 // +--------------------------------+ 0x0000200000000000 (32TB) 117 // | Marked0 View | 118 // +--------------------------------+ 0x0000100000000000 (16TB) 119 // . . 120 // +--------------------------------+ 0x0000000000000000 121 // 122 // 6 4 4 4 4 123 // 3 8 7 4 3 0 124 // +------------------+----+-------------------------------------------------+ 125 // |00000000 00000000 |1111|1111 11111111 11111111 11111111 11111111 11111111| 126 // +------------------+----+-------------------------------------------------+ 127 // | | | 128 // | | * 43-0 Object Offset (44-bits, 16TB address space) 129 // | | 130 // | * 47-44 Metadata Bits (4-bits) 0001 = Marked0 (Address view 16-32TB) 131 // | 0010 = Marked1 (Address view 32-48TB) 132 // | 0100 = Remapped (Address view 64-80TB) 133 // | 1000 = Finalizable (Address view N/A) 134 // | 135 // * 63-48 Fixed (16-bits, always zero) 136 // 137 138 uintptr_t ZPlatformAddressBase() { 139 return 0; 140 } 141 142 size_t ZPlatformAddressOffsetBits() { 143 const size_t min_address_offset_bits = 42; // 4TB 144 const size_t max_address_offset_bits = 44; // 16TB 145 const size_t address_offset = ZUtils::round_up_power_of_2(MaxHeapSize * ZVirtualToPhysicalRatio); 146 const size_t address_offset_bits = log2_intptr(address_offset); 147 return MIN2(MAX2(address_offset_bits, min_address_offset_bits), max_address_offset_bits); 148 } 149 150 size_t ZPlatformAddressMetadataShift() { 151 return ZPlatformAddressOffsetBits(); 152 }