1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_
18#define ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_
19
20#include "arch/instruction_set_features.h"
21
22namespace art {
23
24// Instruction set features relevant to the ARM64 architecture.
25class Arm64InstructionSetFeatures FINAL : public InstructionSetFeatures {
26 public:
27  // Process a CPU variant string like "krait" or "cortex-a15" and create InstructionSetFeatures.
28  static const Arm64InstructionSetFeatures* FromVariant(const std::string& variant,
29                                                        std::string* error_msg);
30
31  // Parse a bitmap and create an InstructionSetFeatures.
32  static const Arm64InstructionSetFeatures* FromBitmap(uint32_t bitmap);
33
34  // Turn C pre-processor #defines into the equivalent instruction set features.
35  static const Arm64InstructionSetFeatures* FromCppDefines();
36
37  // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
38  static const Arm64InstructionSetFeatures* FromCpuInfo();
39
40  // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
41  // InstructionSetFeatures.
42  static const Arm64InstructionSetFeatures* FromHwcap();
43
44  // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
45  // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
46  static const Arm64InstructionSetFeatures* FromAssembly();
47
48  bool Equals(const InstructionSetFeatures* other) const OVERRIDE;
49
50  InstructionSet GetInstructionSet() const OVERRIDE {
51    return kArm64;
52  }
53
54  uint32_t AsBitmap() const OVERRIDE;
55
56  // Return a string of the form "a53" or "none".
57  std::string GetFeatureString() const OVERRIDE;
58
59  // Generate code addressing Cortex-A53 erratum 835769?
60  bool NeedFixCortexA53_835769() const {
61      return fix_cortex_a53_835769_;
62  }
63
64  // Generate code addressing Cortex-A53 erratum 843419?
65  bool NeedFixCortexA53_843419() const {
66      return fix_cortex_a53_843419_;
67  }
68
69  virtual ~Arm64InstructionSetFeatures() {}
70
71 protected:
72  // Parse a vector of the form "a53" adding these to a new ArmInstructionSetFeatures.
73  const InstructionSetFeatures*
74      AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features,
75                                 std::string* error_msg) const OVERRIDE;
76
77 private:
78  Arm64InstructionSetFeatures(bool smp, bool needs_a53_835769_fix, bool needs_a53_843419_fix)
79      : InstructionSetFeatures(smp),
80        fix_cortex_a53_835769_(needs_a53_835769_fix),
81        fix_cortex_a53_843419_(needs_a53_843419_fix) {
82  }
83
84  // Bitmap positions for encoding features as a bitmap.
85  enum {
86    kSmpBitfield = 1,
87    kA53Bitfield = 2,
88  };
89
90  const bool fix_cortex_a53_835769_;
91  const bool fix_cortex_a53_843419_;
92
93  DISALLOW_COPY_AND_ASSIGN(Arm64InstructionSetFeatures);
94};
95
96}  // namespace art
97
98#endif  // ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_
99