/*
* 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)
// . .
// +--------------------------------+ 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)
// . .
// +--------------------------------+ 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)
// . .
// +--------------------------------+ 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 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();
}