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1 // Copyright 2013 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #ifndef V8_A64_CPU_A64_H_ | |
29 #define V8_A64_CPU_A64_H_ | |
30 | |
31 #include <stdio.h> | |
32 #include "serialize.h" | |
33 #include "cpu.h" | |
34 | |
35 namespace v8 { | |
36 namespace internal { | |
37 | |
38 | |
39 // CpuFeatures keeps track of which features are supported by the target CPU. | |
40 // Supported features must be enabled by a CpuFeatureScope before use. | |
41 class CpuFeatures : public AllStatic { | |
42 public: | |
43 // Detect features of the target CPU. Set safe defaults if the serializer | |
44 // is enabled (snapshots must be portable). | |
45 static void Probe(); | |
46 | |
47 // Check whether a feature is supported by the target CPU. | |
48 static bool IsSupported(CpuFeature f) { | |
49 ASSERT(initialized_); | |
50 // There are no optional features for A64. | |
51 return false; | |
52 }; | |
53 | |
54 static bool IsFoundByRuntimeProbingOnly(CpuFeature f) { | |
55 ASSERT(initialized_); | |
56 // There are no optional features for A64. | |
57 return false; | |
58 } | |
59 | |
60 static bool IsSafeForSnapshot(CpuFeature f) { | |
61 return (IsSupported(f) && | |
62 (!Serializer::enabled() || !IsFoundByRuntimeProbingOnly(f))); | |
63 } | |
64 | |
65 // I and D cache line size in bytes. | |
66 static unsigned dcache_line_size(); | |
67 static unsigned icache_line_size(); | |
68 | |
69 static unsigned supported_; | |
70 | |
71 static bool VerifyCrossCompiling() { | |
72 // There are no optional features for A64. | |
73 ASSERT(cross_compile_ == 0); | |
74 return true; | |
75 } | |
76 | |
77 static bool VerifyCrossCompiling(CpuFeature f) { | |
78 // There are no optional features for A64. | |
79 USE(f); | |
80 ASSERT(cross_compile_ == 0); | |
81 return true; | |
82 } | |
83 | |
84 private: | |
85 // Return the content of the cache type register. | |
86 static uint32_t GetCacheType(); | |
87 | |
88 // I and D cache line size in bytes. | |
89 static unsigned icache_line_size_; | |
90 static unsigned dcache_line_size_; | |
91 | |
92 #ifdef DEBUG | |
93 static bool initialized_; | |
94 #endif | |
95 | |
96 // This isn't used (and is always 0), but it is required by V8. | |
97 static unsigned found_by_runtime_probing_only_; | |
98 | |
99 static unsigned cross_compile_; | |
100 | |
101 friend class PlatformFeatureScope; | |
102 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); | |
103 }; | |
104 | |
105 } } // namespace v8::internal | |
106 | |
107 #endif // V8_A64_CPU_A64_H_ | |
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