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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "instruction_set_features_mips.h"
#include <fstream>
#include <sstream>
#include "base/stringprintf.h"
#include "utils.h" // For Trim.
namespace art {
// An enum for the Mips revision.
enum class MipsLevel {
kBase,
kR2,
kR5,
kR6
};
#if defined(_MIPS_ARCH_MIPS32R6)
static constexpr MipsLevel kRuntimeMipsLevel = MipsLevel::kR6;
#elif defined(_MIPS_ARCH_MIPS32R5)
static constexpr MipsLevel kRuntimeMipsLevel = MipsLevel::kR5;
#elif defined(_MIPS_ARCH_MIPS32R2)
static constexpr MipsLevel kRuntimeMipsLevel = MipsLevel::kR2;
#else
static constexpr MipsLevel kRuntimeMipsLevel = MipsLevel::kBase;
#endif
static void GetFlagsFromCppDefined(bool* mips_isa_gte2, bool* r6, bool* fpu_32bit) {
// Override defaults based on compiler flags.
if (kRuntimeMipsLevel >= MipsLevel::kR2) {
*mips_isa_gte2 = true;
} else {
*mips_isa_gte2 = false;
}
if (kRuntimeMipsLevel >= MipsLevel::kR5) {
*fpu_32bit = false;
} else {
*fpu_32bit = true;
}
if (kRuntimeMipsLevel >= MipsLevel::kR6) {
*r6 = true;
} else {
*r6 = false;
}
}
const MipsInstructionSetFeatures* MipsInstructionSetFeatures::FromVariant(
const std::string& variant, std::string* error_msg ATTRIBUTE_UNUSED) {
bool smp = true; // Conservative default.
// Override defaults based on compiler flags.
// This is needed when running ART test where the variant is not defined.
bool fpu_32bit;
bool mips_isa_gte2;
bool r6;
GetFlagsFromCppDefined(&mips_isa_gte2, &r6, &fpu_32bit);
// Override defaults based on variant string.
// Only care if it is R1, R2 or R6 and we assume all CPUs will have a FP unit.
constexpr const char* kMips32Prefix = "mips32r";
const size_t kPrefixLength = strlen(kMips32Prefix);
if (variant.compare(0, kPrefixLength, kMips32Prefix, kPrefixLength) == 0 &&
variant.size() > kPrefixLength) {
if (variant[kPrefixLength] >= '6') {
fpu_32bit = false;
r6 = true;
}
if (variant[kPrefixLength] >= '2') {
mips_isa_gte2 = true;
}
} else if (variant == "default") {
// Default variant is: smp = true, has fpu, is gte2, is not r6. This is the traditional
// setting.
mips_isa_gte2 = true;
} else {
LOG(WARNING) << "Unexpected CPU variant for Mips32 using defaults: " << variant;
}
return new MipsInstructionSetFeatures(smp, fpu_32bit, mips_isa_gte2, r6);
}
const MipsInstructionSetFeatures* MipsInstructionSetFeatures::FromBitmap(uint32_t bitmap) {
bool smp = (bitmap & kSmpBitfield) != 0;
bool fpu_32bit = (bitmap & kFpu32Bitfield) != 0;
bool mips_isa_gte2 = (bitmap & kIsaRevGte2Bitfield) != 0;
bool r6 = (bitmap & kR6) != 0;
return new MipsInstructionSetFeatures(smp, fpu_32bit, mips_isa_gte2, r6);
}
const MipsInstructionSetFeatures* MipsInstructionSetFeatures::FromCppDefines() {
// Assume conservative defaults.
const bool smp = true;
bool fpu_32bit;
bool mips_isa_gte2;
bool r6;
GetFlagsFromCppDefined(&mips_isa_gte2, &r6, &fpu_32bit);
return new MipsInstructionSetFeatures(smp, fpu_32bit, mips_isa_gte2, r6);
}
const MipsInstructionSetFeatures* MipsInstructionSetFeatures::FromCpuInfo() {
// Look in /proc/cpuinfo for features we need. Only use this when we can guarantee that
// the kernel puts the appropriate feature flags in here. Sometimes it doesn't.
// Assume conservative defaults.
bool smp = false;
bool fpu_32bit;
bool mips_isa_gte2;
bool r6;
GetFlagsFromCppDefined(&mips_isa_gte2, &r6, &fpu_32bit);
std::ifstream in("/proc/cpuinfo");
if (!in.fail()) {
while (!in.eof()) {
std::string line;
std::getline(in, line);
if (!in.eof()) {
LOG(INFO) << "cpuinfo line: " << line;
if (line.find("processor") != std::string::npos && line.find(": 1") != std::string::npos) {
smp = true;
}
}
}
in.close();
} else {
LOG(ERROR) << "Failed to open /proc/cpuinfo";
}
return new MipsInstructionSetFeatures(smp, fpu_32bit, mips_isa_gte2, r6);
}
const MipsInstructionSetFeatures* MipsInstructionSetFeatures::FromHwcap() {
UNIMPLEMENTED(WARNING);
return FromCppDefines();
}
const MipsInstructionSetFeatures* MipsInstructionSetFeatures::FromAssembly() {
UNIMPLEMENTED(WARNING);
return FromCppDefines();
}
bool MipsInstructionSetFeatures::Equals(const InstructionSetFeatures* other) const {
if (kMips != other->GetInstructionSet()) {
return false;
}
const MipsInstructionSetFeatures* other_as_mips = other->AsMipsInstructionSetFeatures();
return (IsSmp() == other->IsSmp()) &&
(fpu_32bit_ == other_as_mips->fpu_32bit_) &&
(mips_isa_gte2_ == other_as_mips->mips_isa_gte2_) &&
(r6_ == other_as_mips->r6_);
}
uint32_t MipsInstructionSetFeatures::AsBitmap() const {
return (IsSmp() ? kSmpBitfield : 0) |
(fpu_32bit_ ? kFpu32Bitfield : 0) |
(mips_isa_gte2_ ? kIsaRevGte2Bitfield : 0) |
(r6_ ? kR6 : 0);
}
std::string MipsInstructionSetFeatures::GetFeatureString() const {
std::string result;
if (IsSmp()) {
result += "smp";
} else {
result += "-smp";
}
if (fpu_32bit_) {
result += ",fpu32";
} else {
result += ",-fpu32";
}
if (mips_isa_gte2_) {
result += ",mips2";
} else {
result += ",-mips2";
}
if (r6_) {
result += ",r6";
} // Suppress non-r6.
return result;
}
const InstructionSetFeatures* MipsInstructionSetFeatures::AddFeaturesFromSplitString(
const bool smp, const std::vector<std::string>& features, std::string* error_msg) const {
bool fpu_32bit = fpu_32bit_;
bool mips_isa_gte2 = mips_isa_gte2_;
bool r6 = r6_;
for (auto i = features.begin(); i != features.end(); i++) {
std::string feature = Trim(*i);
if (feature == "fpu32") {
fpu_32bit = true;
} else if (feature == "-fpu32") {
fpu_32bit = false;
} else if (feature == "mips2") {
mips_isa_gte2 = true;
} else if (feature == "-mips2") {
mips_isa_gte2 = false;
} else if (feature == "r6") {
r6 = true;
} else if (feature == "-r6") {
r6 = false;
} else {
*error_msg = StringPrintf("Unknown instruction set feature: '%s'", feature.c_str());
return nullptr;
}
}
return new MipsInstructionSetFeatures(smp, fpu_32bit, mips_isa_gte2, r6);
}
} // namespace art
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