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 #include "instruction_set_features_mips64.h"
18
19 #include <fstream>
20 #include <sstream>
21
22 #include "android-base/stringprintf.h"
23 #include "android-base/strings.h"
24
25 #include "base/logging.h"
26
27 namespace art {
28
29 using android::base::StringPrintf;
30
FromVariant(const std::string & variant,std::string * error_msg ATTRIBUTE_UNUSED)31 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromVariant(
32 const std::string& variant, std::string* error_msg ATTRIBUTE_UNUSED) {
33 bool msa = true;
34 if (variant != "default" && variant != "mips64r6") {
35 LOG(WARNING) << "Unexpected CPU variant for Mips64 using defaults: " << variant;
36 }
37 return Mips64FeaturesUniquePtr(new Mips64InstructionSetFeatures(msa));
38 }
39
FromBitmap(uint32_t bitmap)40 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromBitmap(uint32_t bitmap) {
41 bool msa = (bitmap & kMsaBitfield) != 0;
42 return Mips64FeaturesUniquePtr(new Mips64InstructionSetFeatures(msa));
43 }
44
FromCppDefines()45 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromCppDefines() {
46 #if defined(_MIPS_ARCH_MIPS64R6)
47 const bool msa = true;
48 #else
49 const bool msa = false;
50 #endif
51 return Mips64FeaturesUniquePtr(new Mips64InstructionSetFeatures(msa));
52 }
53
FromCpuInfo()54 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromCpuInfo() {
55 // Look in /proc/cpuinfo for features we need. Only use this when we can guarantee that
56 // the kernel puts the appropriate feature flags in here. Sometimes it doesn't.
57 bool msa = false;
58
59 std::ifstream in("/proc/cpuinfo");
60 if (!in.fail()) {
61 while (!in.eof()) {
62 std::string line;
63 std::getline(in, line);
64 if (!in.eof()) {
65 LOG(INFO) << "cpuinfo line: " << line;
66 if (line.find("ASEs") != std::string::npos) {
67 LOG(INFO) << "found Application Specific Extensions";
68 if (line.find("msa") != std::string::npos) {
69 msa = true;
70 }
71 }
72 }
73 }
74 in.close();
75 } else {
76 LOG(ERROR) << "Failed to open /proc/cpuinfo";
77 }
78 return Mips64FeaturesUniquePtr(new Mips64InstructionSetFeatures(msa));
79 }
80
FromHwcap()81 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromHwcap() {
82 UNIMPLEMENTED(WARNING);
83 return FromCppDefines();
84 }
85
FromAssembly()86 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromAssembly() {
87 UNIMPLEMENTED(WARNING);
88 return FromCppDefines();
89 }
90
Equals(const InstructionSetFeatures * other) const91 bool Mips64InstructionSetFeatures::Equals(const InstructionSetFeatures* other) const {
92 if (InstructionSet::kMips64 != other->GetInstructionSet()) {
93 return false;
94 }
95 const Mips64InstructionSetFeatures* other_as_mips64 = other->AsMips64InstructionSetFeatures();
96 return msa_ == other_as_mips64->msa_;
97 }
98
AsBitmap() const99 uint32_t Mips64InstructionSetFeatures::AsBitmap() const {
100 return (msa_ ? kMsaBitfield : 0);
101 }
102
GetFeatureString() const103 std::string Mips64InstructionSetFeatures::GetFeatureString() const {
104 std::string result;
105 if (msa_) {
106 result += "msa";
107 } else {
108 result += "-msa";
109 }
110 return result;
111 }
112
113 std::unique_ptr<const InstructionSetFeatures>
AddFeaturesFromSplitString(const std::vector<std::string> & features,std::string * error_msg) const114 Mips64InstructionSetFeatures::AddFeaturesFromSplitString(
115 const std::vector<std::string>& features, std::string* error_msg) const {
116 bool msa = msa_;
117 for (auto i = features.begin(); i != features.end(); i++) {
118 std::string feature = android::base::Trim(*i);
119 if (feature == "msa") {
120 msa = true;
121 } else if (feature == "-msa") {
122 msa = false;
123 } else {
124 *error_msg = StringPrintf("Unknown instruction set feature: '%s'", feature.c_str());
125 return nullptr;
126 }
127 }
128 return std::unique_ptr<const InstructionSetFeatures>(new Mips64InstructionSetFeatures(msa));
129 }
130
131 } // namespace art
132