1 /* 2 * Copyright (c) 2015, 2018, 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_ZGLOBALS_LINUX_X86_HPP 25 #define OS_CPU_LINUX_X86_ZGLOBALS_LINUX_X86_HPP 26 27 // 28 // Page Allocation Tiers 29 // --------------------- 30 // 31 // Page Type Page Size Object Size Limit Object Alignment 32 // ------------------------------------------------------------------ 33 // Small 2M <= 265K <MinObjAlignmentInBytes> 34 // Medium 32M <= 4M 4K 35 // Large X*M > 4M 2M 36 // ------------------------------------------------------------------ 37 // 38 // 39 // Address Space & Pointer Layout 40 // ------------------------------ 41 // 42 // +--------------------------------+ 0x00007FFFFFFFFFFF (127TB) 43 // . . 44 // . . 45 // . . 46 // +--------------------------------+ 0x0000140000000000 (20TB) 47 // | Remapped View | 48 // +--------------------------------+ 0x0000100000000000 (16TB) 49 // | (Reserved, but unused) | 50 // +--------------------------------+ 0x00000c0000000000 (12TB) 51 // | Marked1 View | 52 // +--------------------------------+ 0x0000080000000000 (8TB) 53 // | Marked0 View | 54 // +--------------------------------+ 0x0000040000000000 (4TB) 55 // . . 56 // +--------------------------------+ 0x0000000000000000 57 // 58 // 59 // 6 4 4 4 4 4 0 60 // 3 7 6 5 2 1 0 61 // +-------------------+-+----+-----------------------------------------------+ 62 // |00000000 00000000 0|0|1111|11 11111111 11111111 11111111 11111111 11111111| 63 // +-------------------+-+----+-----------------------------------------------+ 64 // | | | | 65 // | | | * 41-0 Object Offset (42-bits, 4TB address space) 66 // | | | 67 // | | * 45-42 Metadata Bits (4-bits) 0001 = Marked0 (Address view 4-8TB) 68 // | | 0010 = Marked1 (Address view 8-12TB) 69 // | | 0100 = Remapped (Address view 16-20TB) 70 // | | 1000 = Finalizable (Address view N/A) 71 // | | 72 // | * 46-46 Unused (1-bit, always zero) 73 // | 74 // * 63-47 Fixed (17-bits, always zero) 75 // 76 77 const size_t ZPlatformPageSizeSmallShift = 21; // 2M 78 79 const size_t ZPlatformAddressOffsetBits = 42; // 4TB 80 81 const uintptr_t ZPlatformAddressMetadataShift = ZPlatformAddressOffsetBits; 82 83 const uintptr_t ZPlatformAddressSpaceStart = (uintptr_t)1 << ZPlatformAddressOffsetBits; 84 const uintptr_t ZPlatformAddressSpaceSize = ((uintptr_t)1 << ZPlatformAddressOffsetBits) * 4; 85 86 const size_t ZPlatformCacheLineSize = 64; 87 88 #endif // OS_CPU_LINUX_X86_ZGLOBALS_LINUX_X86_HPP