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 /* ARM sources Merged up to hotspot/src/closed changeset 2389:b6273c37efea */
26 /* hotspot/make/closed changeset 542:fff0e7e51b36 */
27
28 #ifndef CPU_ARM_VM_VM_VERSION_ARM_HPP
29 #define CPU_ARM_VM_VM_VERSION_ARM_HPP
30
31 #include "runtime/globals_extension.hpp"
32 #include "runtime/vm_version.hpp"
33
34 class VM_Version: public Abstract_VM_Version {
35 friend class JVMCIVMStructs;
36
37 static bool _has_simd;
38
39 protected:
40 // Are we done with vm version initialization
41 static bool _is_initialized;
42
43 public:
44 static void initialize();
45 static bool is_initialized() { return _is_initialized; }
46
47 #ifdef AARCH64
48
49 public:
50 static bool supports_ldrex() { return true; }
51 static bool supports_ldrexd() { return true; }
52 static bool supports_movw() { return true; }
53
54 // Override Abstract_VM_Version implementation
55 static bool use_biased_locking();
56
57 static bool has_simd() { return _has_simd; }
58 static bool has_vfp() { return has_simd(); }
59 static bool simd_math_is_compliant() { return true; }
60
61 static bool prefer_moves_over_load_literal() { return true; }
62
63 #else
64
65 protected:
66 enum Feature_Flag {
67 vfp = 0,
68 vfp3_32 = 1,
69 simd = 2,
70 };
71
72 enum Feature_Flag_Set {
73 unknown_m = 0,
74 all_features_m = -1,
75
76 vfp_m = 1 << vfp,
77 vfp3_32_m = 1 << vfp3_32,
78 simd_m = 1 << simd,
79 };
80
81 // The value stored by "STR PC, [addr]" instruction can be either
82 // (address of this instruction + 8) or (address of this instruction + 12)
83 // depending on hardware implementation.
84 // This adjustment is calculated in runtime.
85 static int _stored_pc_adjustment;
86
87 // ARM architecture version: 5 = ARMv5, 6 = ARMv6, 7 = ARMv7 etc.
88 static int _arm_arch;
89
90 // linux kernel atomic helper function version info
91 // __kuser_cmpxchg() if version >= 2
92 // __kuser_cmpxchg64() if version >= 5
93 static int _kuser_helper_version;
94
95 #define KUSER_HELPER_VERSION_ADDR 0xffff0ffc
96 #define KUSER_VERSION_CMPXCHG32 2
97 #define KUSER_VERSION_CMPXCHG64 5
98
99 // Read additional info using OS-specific interfaces
100 static void get_os_cpu_info();
101
102 public:
103 static void early_initialize();
104
105 static int arm_arch() { return _arm_arch; }
106 static int stored_pc_adjustment() { return _stored_pc_adjustment; }
107 static bool supports_rev() { return _arm_arch >= 6; }
108 static bool supports_ldrex() { return _arm_arch >= 6; }
109 static bool supports_movw() { return _arm_arch >= 7; }
110 static bool supports_ldrexd() { return _arm_arch >= 7; }
111 static bool supports_compare_and_exchange() { return true; }
112 static bool supports_kuser_cmpxchg32() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG32; }
113 static bool supports_kuser_cmpxchg64() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG64; }
114 // Override Abstract_VM_Version implementation
115 static bool use_biased_locking();
116 static const char* vm_info_string();
117
118 static bool has_vfp() { return (_features & vfp_m) != 0; }
119 static bool has_vfp3_32() { return (_features & vfp3_32_m) != 0; }
120 static bool has_simd() { return (_features & simd_m) != 0; }
121
122 static bool simd_math_is_compliant() { return false; }
123
124 static bool prefer_moves_over_load_literal() { return supports_movw(); }
125
126 friend class VM_Version_StubGenerator;
127
128 #endif // AARCH64
129 };
130
131 #endif // CPU_ARM_VM_VM_VERSION_ARM_HPP