vm_version_arm.hpp revision 12422:98fe046473c9 
1/*
2 * Copyright (c) 2008, 2014, 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
25#ifndef CPU_ARM_VM_VM_VERSION_ARM_HPP
26#define CPU_ARM_VM_VM_VERSION_ARM_HPP
27
28#include "runtime/globals_extension.hpp"
29#include "runtime/vm_version.hpp"
30
31class VM_Version: public Abstract_VM_Version {
32  friend class JVMCIVMStructs;
33
34  static bool _has_simd;
35
36 protected:
37  // Are we done with vm version initialization
38  static bool _is_initialized;
39
40 public:
41  static void initialize();
42  static bool is_initialized()      { return _is_initialized; }
43
44#ifdef AARCH64
45
46 public:
47  static bool supports_ldrex()         { return true; }
48  static bool supports_ldrexd()        { return true; }
49  static bool supports_movw()          { return true; }
50
51  // Override Abstract_VM_Version implementation
52  static bool use_biased_locking();
53
54  static bool has_simd()               { return _has_simd; }
55  static bool has_vfp()                { return has_simd(); }
56  static bool simd_math_is_compliant() { return true; }
57
58  static bool prefer_moves_over_load_literal() { return true; }
59
60#else
61
62 protected:
63  enum Feature_Flag {
64    vfp = 0,
65    vfp3_32 = 1,
66    simd = 2,
67  };
68
69  enum Feature_Flag_Set {
70    unknown_m           = 0,
71    all_features_m      = -1,
72
73    vfp_m     = 1 << vfp,
74    vfp3_32_m = 1 << vfp3_32,
75    simd_m    = 1 << simd,
76  };
77
78  // The value stored by "STR PC, [addr]" instruction can be either
79  // (address of this instruction + 8) or (address of this instruction + 12)
80  // depending on hardware implementation.
81  // This adjustment is calculated in runtime.
82  static int _stored_pc_adjustment;
83
84  // ARM architecture version: 5 = ARMv5, 6 = ARMv6, 7 = ARMv7 etc.
85  static int _arm_arch;
86
87  // linux kernel atomic helper function version info
88  // __kuser_cmpxchg() if version >= 2
89  // __kuser_cmpxchg64() if version >= 5
90  static int _kuser_helper_version;
91
92#define KUSER_HELPER_VERSION_ADDR 0xffff0ffc
93#define KUSER_VERSION_CMPXCHG32 2
94#define KUSER_VERSION_CMPXCHG64 5
95
96  // Read additional info using OS-specific interfaces
97  static void get_os_cpu_info();
98
99 public:
100  static void early_initialize();
101
102  static int arm_arch()             { return _arm_arch; }
103  static int stored_pc_adjustment() { return _stored_pc_adjustment; }
104  static bool supports_rev()        { return _arm_arch >= 6; }
105  static bool supports_ldrex()      { return _arm_arch >= 6; }
106  static bool supports_movw()       { return _arm_arch >= 7; }
107  static bool supports_ldrexd()     { return _arm_arch >= 7; }
108  static bool supports_compare_and_exchange() { return true; }
109  static bool supports_kuser_cmpxchg32() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG32; }
110  static bool supports_kuser_cmpxchg64() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG64; }
111  // Override Abstract_VM_Version implementation
112  static bool use_biased_locking();
113  static const char* vm_info_string();
114
115  static bool has_vfp()             { return (_features & vfp_m) != 0; }
116  static bool has_vfp3_32()         { return (_features & vfp3_32_m) != 0; }
117  static bool has_simd()            { return (_features & simd_m) != 0; }
118
119  static bool simd_math_is_compliant() { return false; }
120
121  static bool prefer_moves_over_load_literal() { return supports_movw(); }
122
123  friend class VM_Version_StubGenerator;
124
125#endif // AARCH64
126};
127
128#endif // CPU_ARM_VM_VM_VERSION_ARM_HPP
129