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// 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 "cpu_features_macros.h"
#ifdef CPU_FEATURES_ARCH_AARCH64
#if defined(CPU_FEATURES_OS_LINUX) || defined(CPU_FEATURES_OS_ANDROID)
#include "impl_aarch64__base_implementation.inl"
static bool HandleAarch64Line(const LineResult result,
Aarch64Info* const info) {
StringView line = result.line;
StringView key, value;
if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value)) {
if (CpuFeatures_StringView_IsEquals(key, str("Features"))) {
for (size_t i = 0; i < AARCH64_LAST_; ++i) {
kSetters[i](&info->features, CpuFeatures_StringView_HasWord(
value, kCpuInfoFlags[i], ' '));
}
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU implementer"))) {
info->implementer = CpuFeatures_StringView_ParsePositiveNumber(value);
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU variant"))) {
info->variant = CpuFeatures_StringView_ParsePositiveNumber(value);
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU part"))) {
info->part = CpuFeatures_StringView_ParsePositiveNumber(value);
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU revision"))) {
info->revision = CpuFeatures_StringView_ParsePositiveNumber(value);
}
}
return !result.eof;
}
static void FillProcCpuInfoData(Aarch64Info* const info) {
const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
if (fd >= 0) {
StackLineReader reader;
StackLineReader_Initialize(&reader, fd);
for (;;) {
if (!HandleAarch64Line(StackLineReader_NextLine(&reader), info)) {
break;
}
}
CpuFeatures_CloseFile(fd);
}
}
static const Aarch64Info kEmptyAarch64Info;
Aarch64Info GetAarch64Info(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).
Aarch64Info info = kEmptyAarch64Info;
FillProcCpuInfoData(&info);
const HardwareCapabilities hwcaps = CpuFeatures_GetHardwareCapabilities();
for (size_t i = 0; i < AARCH64_LAST_; ++i) {
if (CpuFeatures_IsHwCapsSet(kHardwareCapabilities[i], hwcaps)) {
kSetters[i](&info.features, true);
}
}
return info;
}
#endif // defined(CPU_FEATURES_OS_LINUX) || defined(CPU_FEATURES_OS_ANDROID)
#endif // CPU_FEATURES_ARCH_AARCH64
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