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      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 
     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 
     40 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromBitmap(uint32_t bitmap) {
     41   bool msa = (bitmap & kMsaBitfield) != 0;
     42   return Mips64FeaturesUniquePtr(new Mips64InstructionSetFeatures(msa));
     43 }
     44 
     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 
     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 
     81 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromHwcap() {
     82   UNIMPLEMENTED(WARNING);
     83   return FromCppDefines();
     84 }
     85 
     86 Mips64FeaturesUniquePtr Mips64InstructionSetFeatures::FromAssembly() {
     87   UNIMPLEMENTED(WARNING);
     88   return FromCppDefines();
     89 }
     90 
     91 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 
     99 uint32_t Mips64InstructionSetFeatures::AsBitmap() const {
    100   return (msa_ ? kMsaBitfield : 0);
    101 }
    102 
    103 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>
    114 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