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        "cpuid\n"
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        "cpuid\n"
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        ::: "eax", "ebx", "ecx", "edx", "memory"
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        ::: "eax", "ebx", "ecx", "edx", "memory"
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    );
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    );
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}
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}
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#ifdef CONFIG_FENCES_P4
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#if defined(CONFIG_FENCES_P4)
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#   define memory_barrier()     asm volatile ("mfence\n" ::: "memory")
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#   define memory_barrier()     asm volatile ("mfence\n" ::: "memory")
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#   define read_barrier()       asm volatile ("lfence\n" ::: "memory")
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#   define read_barrier()       asm volatile ("lfence\n" ::: "memory")
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#   ifdef CONFIG_WEAK_MEMORY
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#   ifdef CONFIG_WEAK_MEMORY
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#       define write_barrier()  asm volatile ("sfence\n" ::: "memory")
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#       define write_barrier()  asm volatile ("sfence\n" ::: "memory")
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#   else
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#   else
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#       define write_barrier()  asm volatile( "" ::: "memory");
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#       define write_barrier()  asm volatile( "" ::: "memory");
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#   endif
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#   endif
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#elif CONFIG_FENCES_P3
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#elif defined(CONFIG_FENCES_P3)
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#   define memory_barrier()     cpuid_serialization()
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#   define memory_barrier()     cpuid_serialization()
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#   define read_barrier()       cpuid_serialization()
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#   define read_barrier()       cpuid_serialization()
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#   ifdef CONFIG_WEAK_MEMORY
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#   ifdef CONFIG_WEAK_MEMORY
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#       define write_barrier()  asm volatile ("sfence\n" ::: "memory")
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#       define write_barrier()  asm volatile ("sfence\n" ::: "memory")
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#   else
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#   else