src/commons/cpuid.h

//
// This library would be a straightforward target for auto-generation from a
// spec.
//

#ifndef COMMONS_CPUID_H
#define COMMONS_CPUID_H

#include <commons/x86asm.h>

namespace commons
{

  enum {
    CACHE = 2,
    CACHE_LINE_SIZES = 0x80000005
  };

#define cpuid(func,ax,bx,cx,dx)\
          __asm__ __volatile__ ("cpuid":\
          "=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (func));

  inline unsigned short
  cache_line_sizes_intel()
  {
    unsigned int a, b, c, d;
    cpuid(1, a, b, c, d);
    return static_cast<unsigned short>(high(b) * 8);
  }

  inline void
  cache_line_sizes_amd(unsigned char *iline, unsigned char *dline)
  {
    int a, b, c, d;
    cpuid(CACHE_LINE_SIZES, a, b, c, d);
    *dline = low(c);
    *iline = low(d);
  }

}

#endif

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