1 // Copyright 2017 Google Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_ 16 #define CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_ 17 18 #include <stdint.h> 19 20 #include "cpu_features_macros.h" 21 22 CPU_FEATURES_START_CPP_NAMESPACE 23 24 // A struct to hold the result of a call to cpuid. 25 typedef struct { 26 uint32_t eax, ebx, ecx, edx; 27 } Leaf; 28 29 Leaf CpuIdEx(uint32_t leaf_id, int ecx); 30 31 // Returns the eax value of the XCR0 register. 32 uint32_t GetXCR0Eax(void); 33 34 CPU_FEATURES_END_CPP_NAMESPACE 35 36 #endif // CPU_FEATURES_INCLUDE_INTERNAL_CPUID_X86_H_ 37