| // 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. |
| |
| // CapabilityConfig provides a way to map cpu features to hardware caps and |
| // /proc/cpuinfo flags. We then provide functions to update capabilities from |
| // either source. |
| #ifndef CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_ |
| #define CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_ |
| |
| #include <ctype.h> |
| #include <stdint.h> |
| #include "cpu_features_macros.h" |
| #include "internal/hwcaps.h" |
| #include "internal/string_view.h" |
| |
| CPU_FEATURES_START_CPP_NAMESPACE |
| |
| // Use the following macro to declare setter functions to be used in |
| // CapabilityConfig. |
| #define DECLARE_SETTER(FeatureType, FeatureName) \ |
| static void set_##FeatureName(void* const features, bool value) { \ |
| ((FeatureType*)features)->FeatureName = value; \ |
| } |
| |
| // Describes the relationship between hardware caps and /proc/cpuinfo flags. |
| typedef struct { |
| const HardwareCapabilities hwcaps_mask; |
| const char* const proc_cpuinfo_flag; |
| void (*set_bit)(void* const, bool); // setter for the corresponding bit. |
| } CapabilityConfig; |
| |
| // For every config, looks into flags_line for the presence of the |
| // corresponding proc_cpuinfo_flag, calls `set_bit` accordingly. |
| // Note: features is a pointer to the underlying Feature struct. |
| void CpuFeatures_SetFromFlags(const size_t configs_size, |
| const CapabilityConfig* configs, |
| const StringView flags_line, |
| void* const features); |
| |
| // For every config, looks into hwcaps for the presence of the feature. Calls |
| // `set_bit` with true if the hardware capability is found. |
| // Note: features is a pointer to the underlying Feature struct. |
| void CpuFeatures_OverrideFromHwCaps(const size_t configs_size, |
| const CapabilityConfig* configs, |
| const HardwareCapabilities hwcaps, |
| void* const features); |
| |
| CPU_FEATURES_END_CPP_NAMESPACE |
| #endif // CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_ |