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
31 class 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 static const char* vm_info_string();
112
113 static bool has_vfp() { return (_features & vfp_m) != 0; }
114 static bool has_vfp3_32() { return (_features & vfp3_32_m) != 0; }
115 static bool has_simd() { return (_features & simd_m) != 0; }
116
117 static bool simd_math_is_compliant() { return false; }
118
119 static bool prefer_moves_over_load_literal() { return supports_movw(); }
120
121 friend class VM_Version_StubGenerator;
122
123 #endif // AARCH64
124 };
125
126 #endif // CPU_ARM_VM_VM_VERSION_ARM_HPP