--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/cpu/aarch64/gc/z/zGlobals_aarch64.cpp Fri Aug 30 10:44:06 2019 +0200
@@ -0,0 +1,173 @@
+/*
+ * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "precompiled.hpp"
+#include "gc/z/zGlobals.hpp"
+#include "gc/z/zUtils.inline.hpp"
+#include "runtime/globals.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+//
+// The heap can have three different layouts, depending on the max heap size.
+//
+// Address Space & Pointer Layout 1
+// --------------------------------
+//
+// +--------------------------------+ 0x00007FFFFFFFFFFF (127TB)
+// . .
+// . .
+// . .
+// +--------------------------------+ 0x0000014000000000 (20TB)
+// | Remapped View |
+// +--------------------------------+ 0x0000010000000000 (16TB)
+// | (Reserved, but unused) |
+// +--------------------------------+ 0x00000c0000000000 (12TB)
+// | Marked1 View |
+// +--------------------------------+ 0x0000080000000000 (8TB)
+// | Marked0 View |
+// +--------------------------------+ 0x0000040000000000 (4TB)
+// . .
+// +--------------------------------+ 0x0000000000000000
+//
+// 6 4 4 4 4
+// 3 6 5 2 1 0
+// +--------------------+----+-----------------------------------------------+
+// |00000000 00000000 00|1111|11 11111111 11111111 11111111 11111111 11111111|
+// +--------------------+----+-----------------------------------------------+
+// | | |
+// | | * 41-0 Object Offset (42-bits, 4TB address space)
+// | |
+// | * 45-42 Metadata Bits (4-bits) 0001 = Marked0 (Address view 4-8TB)
+// | 0010 = Marked1 (Address view 8-12TB)
+// | 0100 = Remapped (Address view 16-20TB)
+// | 1000 = Finalizable (Address view N/A)
+// |
+// * 63-46 Fixed (18-bits, always zero)
+//
+//
+// Address Space & Pointer Layout 2
+// --------------------------------
+//
+// +--------------------------------+ 0x00007FFFFFFFFFFF (127TB)
+// . .
+// . .
+// . .
+// +--------------------------------+ 0x0000280000000000 (40TB)
+// | Remapped View |
+// +--------------------------------+ 0x0000200000000000 (32TB)
+// | (Reserved, but unused) |
+// +--------------------------------+ 0x0000180000000000 (24TB)
+// | Marked1 View |
+// +--------------------------------+ 0x0000100000000000 (16TB)
+// | Marked0 View |
+// +--------------------------------+ 0x0000080000000000 (8TB)
+// . .
+// +--------------------------------+ 0x0000000000000000
+//
+// 6 4 4 4 4
+// 3 7 6 3 2 0
+// +------------------+-----+------------------------------------------------+
+// |00000000 00000000 0|1111|111 11111111 11111111 11111111 11111111 11111111|
+// +-------------------+----+------------------------------------------------+
+// | | |
+// | | * 42-0 Object Offset (43-bits, 8TB address space)
+// | |
+// | * 46-43 Metadata Bits (4-bits) 0001 = Marked0 (Address view 8-16TB)
+// | 0010 = Marked1 (Address view 16-24TB)
+// | 0100 = Remapped (Address view 32-40TB)
+// | 1000 = Finalizable (Address view N/A)
+// |
+// * 63-47 Fixed (17-bits, always zero)
+//
+//
+// Address Space & Pointer Layout 3
+// --------------------------------
+//
+// +--------------------------------+ 0x00007FFFFFFFFFFF (127TB)
+// . .
+// . .
+// . .
+// +--------------------------------+ 0x0000500000000000 (80TB)
+// | Remapped View |
+// +--------------------------------+ 0x0000400000000000 (64TB)
+// | (Reserved, but unused) |
+// +--------------------------------+ 0x0000300000000000 (48TB)
+// | Marked1 View |
+// +--------------------------------+ 0x0000200000000000 (32TB)
+// | Marked0 View |
+// +--------------------------------+ 0x0000100000000000 (16TB)
+// . .
+// +--------------------------------+ 0x0000000000000000
+//
+// 6 4 4 4 4
+// 3 8 7 4 3 0
+// +------------------+----+-------------------------------------------------+
+// |00000000 00000000 |1111|1111 11111111 11111111 11111111 11111111 11111111|
+// +------------------+----+-------------------------------------------------+
+// | | |
+// | | * 43-0 Object Offset (44-bits, 16TB address space)
+// | |
+// | * 47-44 Metadata Bits (4-bits) 0001 = Marked0 (Address view 16-32TB)
+// | 0010 = Marked1 (Address view 32-48TB)
+// | 0100 = Remapped (Address view 64-80TB)
+// | 1000 = Finalizable (Address view N/A)
+// |
+// * 63-48 Fixed (16-bits, always zero)
+//
+
+uintptr_t ZPlatformAddressSpaceStart() {
+ const uintptr_t first_heap_view_address = (uintptr_t)1 << (ZPlatformAddressMetadataShift() + 0);
+ const size_t min_address_offset = 0;
+ return first_heap_view_address + min_address_offset;
+}
+
+uintptr_t ZPlatformAddressSpaceEnd() {
+ const uintptr_t last_heap_view_address = (uintptr_t)1 << (ZPlatformAddressMetadataShift() + 2);
+ const size_t max_address_offset = (size_t)1 << ZPlatformAddressOffsetBits();
+ return last_heap_view_address + max_address_offset;
+}
+
+uintptr_t ZPlatformAddressReservedStart() {
+ return ZPlatformAddressSpaceStart();
+}
+
+uintptr_t ZPlatformAddressReservedEnd() {
+ return ZPlatformAddressSpaceEnd();
+}
+
+uintptr_t ZPlatformAddressBase() {
+ return 0;
+}
+
+size_t ZPlatformAddressOffsetBits() {
+ const size_t min_address_offset_bits = 42; // 4TB
+ const size_t max_address_offset_bits = 44; // 16TB
+ const size_t virtual_to_physical_ratio = 7; // 7:1
+ const size_t address_offset = ZUtils::round_up_power_of_2(MaxHeapSize * virtual_to_physical_ratio);
+ const size_t address_offset_bits = log2_intptr(address_offset);
+ return MIN2(MAX2(address_offset_bits, min_address_offset_bits), max_address_offset_bits);
+}
+
+size_t ZPlatformAddressMetadataShift() {
+ return ZPlatformAddressOffsetBits();
+}