| // Copyright 2017 Google LLC |
| // |
| // 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 "cpuinfo_mips.h" |
| |
| #include <assert.h> |
| |
| #include "internal/filesystem.h" |
| #include "internal/hwcaps.h" |
| #include "internal/stack_line_reader.h" |
| #include "internal/string_view.h" |
| |
| // Generation of feature's getters/setters functions and kGetters, kSetters, |
| // kCpuInfoFlags and kHardwareCapabilities global tables. |
| #define DEFINE_TABLE_FEATURES \ |
| FEATURE(MIPS_MSA, msa, "msa", MIPS_HWCAP_MSA, 0) \ |
| FEATURE(MIPS_EVA, eva, "eva", 0, 0) \ |
| FEATURE(MIPS_R6, r6, "r6", MIPS_HWCAP_R6, 0) |
| #define DEFINE_TABLE_FEATURE_TYPE MipsFeatures |
| #include "define_tables.h" |
| |
| static bool HandleMipsLine(const LineResult result, |
| MipsFeatures* const features) { |
| StringView key, value; |
| // See tests for an example. |
| if (CpuFeatures_StringView_GetAttributeKeyValue(result.line, &key, &value)) { |
| if (CpuFeatures_StringView_IsEquals(key, str("ASEs implemented"))) { |
| for (size_t i = 0; i < MIPS_LAST_; ++i) { |
| kSetters[i](features, |
| CpuFeatures_StringView_HasWord(value, kCpuInfoFlags[i])); |
| } |
| } |
| } |
| return !result.eof; |
| } |
| |
| static void FillProcCpuInfoData(MipsFeatures* const features) { |
| const int fd = CpuFeatures_OpenFile("/proc/cpuinfo"); |
| if (fd >= 0) { |
| StackLineReader reader; |
| StackLineReader_Initialize(&reader, fd); |
| for (;;) { |
| if (!HandleMipsLine(StackLineReader_NextLine(&reader), features)) { |
| break; |
| } |
| } |
| CpuFeatures_CloseFile(fd); |
| } |
| } |
| |
| static const MipsInfo kEmptyMipsInfo; |
| |
| MipsInfo GetMipsInfo(void) { |
| // capabilities are fetched from both getauxval and /proc/cpuinfo so we can |
| // have some information if the executable is sandboxed (aka no access to |
| // /proc/cpuinfo). |
| MipsInfo info = kEmptyMipsInfo; |
| |
| FillProcCpuInfoData(&info.features); |
| const HardwareCapabilities hwcaps = CpuFeatures_GetHardwareCapabilities(); |
| for (size_t i = 0; i < MIPS_LAST_; ++i) { |
| if (CpuFeatures_IsHwCapsSet(kHardwareCapabilities[i], hwcaps)) { |
| kSetters[i](&info.features, true); |
| } |
| } |
| return info; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Introspection functions |
| |
| int GetMipsFeaturesEnumValue(const MipsFeatures* features, |
| MipsFeaturesEnum value) { |
| if (value >= MIPS_LAST_) return false; |
| return kGetters[value](features); |
| } |
| |
| const char* GetMipsFeaturesEnumName(MipsFeaturesEnum value) { |
| if (value >= MIPS_LAST_) return "unknown feature"; |
| return kCpuInfoFlags[value]; |
| } |