The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/asm/cpufeature.h

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    1 /* Public domain. */
    2 
    3 #ifndef _LINUXKPI_ASM_CPUFEATURE_H
    4 #define _LINUXKPI_ASM_CPUFEATURE_H
    5 
    6 #if defined(__amd64__) || defined(__i386__)
    7 
    8 #include <sys/types.h>
    9 #include <machine/md_var.h>
   10 
   11 #define X86_FEATURE_CLFLUSH     1
   12 #define X86_FEATURE_XMM4_1      2
   13 #define X86_FEATURE_PAT         3
   14 #define X86_FEATURE_HYPERVISOR  4
   15 
   16 static inline bool
   17 static_cpu_has(uint16_t f)
   18 {
   19         switch (f) {
   20         case X86_FEATURE_CLFLUSH:
   21                 return ((cpu_feature & CPUID_CLFSH) != 0);
   22         case X86_FEATURE_XMM4_1:
   23                 return ((cpu_feature2 & CPUID2_SSE41) != 0);
   24         case X86_FEATURE_PAT:
   25                 return ((cpu_feature & CPUID_PAT) != 0);
   26         case X86_FEATURE_HYPERVISOR:
   27                 return ((cpu_feature2 & CPUID2_HV) != 0);
   28         default:
   29                 return (false);
   30         }
   31 }
   32 
   33 #define boot_cpu_has(x) static_cpu_has(x)
   34 
   35 #endif
   36 
   37 #endif

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