mirror of
https://github.com/google/cpu_features.git
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99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
// Copyright 2017 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "cpuinfo_mips.h"
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#include "internal/filesystem.h"
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#include "internal/linux_features_aggregator.h"
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#include "internal/stack_line_reader.h"
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#include "internal/string_view.h"
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DECLARE_SETTER(MipsFeatures, msa)
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DECLARE_SETTER(MipsFeatures, eva)
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static const CapabilityConfig kConfigs[] = {
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{{MIPS_HWCAP_MSA, 0}, "msa", &set_msa}, //
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{{MIPS_HWCAP_EVA, 0}, "eva", &set_eva}, //
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};
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static const size_t kConfigsSize = sizeof(kConfigs) / sizeof(CapabilityConfig);
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static bool HandleMipsLine(const LineResult result,
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MipsFeatures* const features) {
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StringView key, value;
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// See tests for an example.
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if (CpuFeatures_StringView_GetAttributeKeyValue(result.line, &key, &value)) {
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if (CpuFeatures_StringView_IsEquals(key, str("ASEs implemented"))) {
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CpuFeatures_SetFromFlags(kConfigsSize, kConfigs, value, features);
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}
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}
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return !result.eof;
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}
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static void FillProcCpuInfoData(MipsFeatures* const features) {
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const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
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if (fd >= 0) {
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StackLineReader reader;
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StackLineReader_Initialize(&reader, fd);
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for (;;) {
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if (!HandleMipsLine(StackLineReader_NextLine(&reader), features)) {
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break;
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}
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}
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CpuFeatures_CloseFile(fd);
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}
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}
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static const MipsInfo kEmptyMipsInfo;
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MipsInfo GetMipsInfo(void) {
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// capabilities are fetched from both getauxval and /proc/cpuinfo so we can
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// have some information if the executable is sandboxed (aka no access to
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// /proc/cpuinfo).
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MipsInfo info = kEmptyMipsInfo;
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FillProcCpuInfoData(&info.features);
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CpuFeatures_OverrideFromHwCaps(kConfigsSize, kConfigs,
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CpuFeatures_GetHardwareCapabilities(),
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&info.features);
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return info;
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}
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////////////////////////////////////////////////////////////////////////////////
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// Introspection functions
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int GetMipsFeaturesEnumValue(const MipsFeatures* features,
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MipsFeaturesEnum value) {
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switch (value) {
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case MIPS_MSA:
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return features->msa;
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case MIPS_EVA:
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return features->eva;
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case MIPS_LAST_:
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break;
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}
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return false;
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}
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const char* GetMipsFeaturesEnumName(MipsFeaturesEnum value) {
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switch (value) {
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case MIPS_MSA:
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return "msa";
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case MIPS_EVA:
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return "eva";
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case MIPS_LAST_:
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break;
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}
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return "unknown feature";
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}
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