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74 lines
3.1 KiB
C
74 lines
3.1 KiB
C
// Copyright 2017 Google LLC
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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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// CapabilityConfig provides a way to map cpu features to hardware caps and
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// /proc/cpuinfo flags. We then provide functions to update capabilities from
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// either source.
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#ifndef CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
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#define CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
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#include <ctype.h>
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#include <stdint.h>
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#include "cpu_features_macros.h"
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#include "internal/hwcaps.h"
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#include "internal/string_view.h"
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CPU_FEATURES_START_CPP_NAMESPACE
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// Use the following macro to declare setter functions to be used in
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// CapabilityConfig.
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#define DECLARE_SETTER(FeatureType, FeatureName) \
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static void set_##FeatureName(void* const features, bool value) { \
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((FeatureType*)features)->FeatureName = value; \
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}
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// Use the following macro to declare getter functions to be used in
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// CapabilityConfig.
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#define DECLARE_GETTER(FeatureType, FeatureName) \
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static int get_##FeatureName(void* const features) { \
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return ((FeatureType*)features)->FeatureName; \
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}
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#define DECLARE_SETTER_AND_GETTER(FeatureType, FeatureName) \
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DECLARE_SETTER(FeatureType, FeatureName) \
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DECLARE_GETTER(FeatureType, FeatureName)
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// Describes the relationship between hardware caps and /proc/cpuinfo flags.
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typedef struct {
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const HardwareCapabilities hwcaps_mask;
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const char* const proc_cpuinfo_flag;
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void (*set_bit)(void* const, bool); // setter for the corresponding bit.
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int (*get_bit)(void* const); // getter for the corresponding bit.
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} CapabilityConfig;
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// For every config, looks into flags_line for the presence of the
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// corresponding proc_cpuinfo_flag, calls `set_bit` accordingly.
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// Note: features is a pointer to the underlying Feature struct.
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void CpuFeatures_SetFromFlags(const size_t configs_size,
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const CapabilityConfig* configs,
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const StringView flags_line,
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void* const features);
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// For every config, looks into hwcaps for the presence of the feature. Calls
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// `set_bit` with true if the hardware capability is found.
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// Note: features is a pointer to the underlying Feature struct.
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void CpuFeatures_OverrideFromHwCaps(const size_t configs_size,
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const CapabilityConfig* configs,
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const HardwareCapabilities hwcaps,
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void* const features);
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CPU_FEATURES_END_CPP_NAMESPACE
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#endif // CPU_FEATURES_INCLUDE_INTERNAL_LINUX_FEATURES_AGGREGATOR_H_
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