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58978af429
Use 'volatile' for the CPU feature masks and dispatched function pointers. We don't need memory barriers for them, so 'volatile' is good enough to stop the compiler from inserting bogus reads/writes.
40 lines
870 B
C
40 lines
870 B
C
/*
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* x86/cpu_features.h - feature detection for x86 processors
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*/
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#ifndef LIB_X86_CPU_FEATURES_H
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#define LIB_X86_CPU_FEATURES_H
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#include "../lib_common.h"
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#if defined(__x86_64__) && COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE
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# define X86_CPU_FEATURES_ENABLED 1
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#else
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# define X86_CPU_FEATURES_ENABLED 0
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#endif
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#if X86_CPU_FEATURES_ENABLED
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#define X86_CPU_FEATURE_SSE2 0x00000001
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#define X86_CPU_FEATURE_PCLMULQDQ 0x00000002
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#define X86_CPU_FEATURE_AVX 0x00000004
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#define X86_CPU_FEATURE_AVX2 0x00000008
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#define X86_CPU_FEATURE_BMI2 0x00000010
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#define X86_CPU_FEATURES_KNOWN 0x80000000
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extern volatile u32 _cpu_features;
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extern void setup_cpu_features(void);
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static inline u32 get_cpu_features(void)
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{
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if (_cpu_features == 0)
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setup_cpu_features();
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return _cpu_features;
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}
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#endif /* X86_CPU_FEATURES_ENABLED */
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#endif /* LIB_X86_CPU_FEATURES_H */
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