1: //
    2: // gettsc.inl
    3: //
    4: // gives access to the Pentium's (secret) cycle counter
    5: //
    6: // This software was written by Leonard Janke (janke@unixg.ubc.ca)
    7: // in 1996-7 and is entered, by him, into the public domain.
    8: 
    9: #if defined(__WATCOMC__)
   10: void GetTSC(unsigned long&);
   11: #pragma aux GetTSC = 0x0f 0x31 "mov [edi], eax" parm [edi] modify [edx eax];
   12: #elif defined(__GNUC__)
   13: inline
   14: void GetTSC(unsigned long& tsc)
   15: {
   16:   asm volatile(".byte 15, 49\n\t"
   17:                : "=eax" (tsc)
   18:                :
   19:                : "%edx", "%eax");
   20: }
   21: #elif defined(_MSC_VER)
   22: inline
   23: void GetTSC(unsigned long& tsc)
   24: {
   25:   unsigned long a;
   26:   __asm _emit 0fh
   27:   __asm _emit 31h
   28:   __asm mov a, eax;
   29:   tsc=a;
   30: }
   31: #endif      
   32: 
   33: #include <stdio.h>
   34: #include <stdlib.h>
   35: #include <openssl/des.h>
   36: 
   37: void main(int argc,char *argv[])
   38:         {
   39:         des_key_schedule key;
   40:         unsigned long s1,s2,e1,e2;
   41:         unsigned long data[2];
   42:         int i,j;
   43: 
   44:         for (j=0; j<6; j++)
   45:                 {
   46:                 for (i=0; i<1000; i++) /**/
   47:                         {
   48:                         des_encrypt(&data[0],key,1);
   49:                         GetTSC(s1);
   50:                         des_encrypt(&data[0],key,1);
   51:                         des_encrypt(&data[0],key,1);
   52:                         des_encrypt(&data[0],key,1);
   53:                         GetTSC(e1);
   54:                         GetTSC(s2);
   55:                         des_encrypt(&data[0],key,1);
   56:                         des_encrypt(&data[0],key,1);
   57:                         des_encrypt(&data[0],key,1);
   58:                         des_encrypt(&data[0],key,1);
   59:                         GetTSC(e2);
   60:                         des_encrypt(&data[0],key,1);
   61:                         }
   62: 
   63:                 printf("des %d %d (%d)\n",
   64:                         e1-s1,e2-s2,((e2-s2)-(e1-s1)));
   65:                 }
   66:         }
   67: