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// Copyright 2017 Google Inc.
//
// 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 "internal/filesystem.h"
#include "internal/stack_line_reader.h"
#include "internal/string_view.h"
#include "internal/unix_features_aggregator.h"
#include <assert.h>
DECLARE_SETTER(MipsFeatures, msa)
DECLARE_SETTER(MipsFeatures, eva)
DECLARE_SETTER(MipsFeatures, r6)
static const CapabilityConfig kConfigs[] = {
[MIPS_MSA] = {{MIPS_HWCAP_MSA, 0}, "msa", &set_msa}, //
[MIPS_EVA] = {{0, 0}, "eva", &set_eva}, //
[MIPS_R6] = {{MIPS_HWCAP_R6, 0}, "r6", &set_r6}, //
};
static const size_t kConfigsSize = sizeof(kConfigs) / sizeof(CapabilityConfig);
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"))) {
CpuFeatures_SetFromFlags(kConfigsSize, kConfigs, value, features);
}
}
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) {
assert(kConfigsSize == MIPS_LAST_);
// 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);
CpuFeatures_OverrideFromHwCaps(kConfigsSize, kConfigs,
CpuFeatures_GetHardwareCapabilities(),
&info.features);
return info;
}
////////////////////////////////////////////////////////////////////////////////
// Introspection functions
int GetMipsFeaturesEnumValue(const MipsFeatures* features,
MipsFeaturesEnum value) {
switch (value) {
case MIPS_MSA:
return features->msa;
case MIPS_EVA:
return features->eva;
case MIPS_R6:
return features->r6;
case MIPS_LAST_:
break;
}
return false;
}
const char* GetMipsFeaturesEnumName(MipsFeaturesEnum value) {
if(value >= kConfigsSize)
return "unknown feature";
return kConfigs[value].proc_cpuinfo_flag;
}
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