testcases/realtime/include/libtsc.h

   1 /******************************************************************************
   2  *
   3  *   Copyright © International Business Machines  Corp., 2006-2008
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  *
  19  * NAME
  20  *       libtsc.h
  21  *
  22  * DESCRIPTION
  23  *
  24  * USAGE:
  25  *       To be included in some testcases.
  26  *
  27  * AUTHOR
  28  *        Darren Hart <dvhltc@us.ibm.com>
  29  *        Giuseppe Cavallaro <peppe.cavallarost.com>
  30  *
  31  * HISTORY
  32  *      It directly comes from the librttest.h (see its HISTORY).
  33  *
  34  *****************************************************************************/
  35
  36 #undef TSC_UNSUPPORTED
  37
  38 /* TSC macros */
  39 #if defined(__i386__)
  40 #define rdtscll(val) __asm__ __volatile__("rdtsc" : "=A" (val))
  41 #elif defined(__x86_64__)
  42 #define rdtscll(val)                                    \
  43         do {                                            \
  44                 uint32_t low, high;                     \
  45                 __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high)); \
  46                 val = (uint64_t)high << 32 | low;       \
  47         } while (0)
  48 #elif defined(__powerpc__)
  49 #if defined(__powerpc64__)      /* 64bit version */
  50 #define rdtscll(val)                                    \
  51         do {                                                            \
  52                 __asm__ __volatile__ ("mfspr %0, 268" : "=r" (val));    \
  53         } while (0)
  54 #else   /*__powerpc__ 32bit version */
  55 #define rdtscll(val)                                                    \
  56          do {                                                           \
  57                 uint32_t tbhi, tblo ;                                   \
  58                 __asm__ __volatile__ ("mftbu %0" : "=r" (tbhi));        \
  59                 __asm__ __volatile__ ("mftbl %0" : "=r" (tblo));        \
  60                 val = 1000 * ((uint64_t) tbhi << 32) | tblo;            \
  61         } while (0)
  62 #endif
  63 #else
  64 #warning TSC UNSUPPORTED
  65 /* All tests will be compiled also for the
  66  * architecture without TSC support (e.g. SH).
  67  * At run-time these will fail with ENOTSUP.
  68  */
  69 #define rdtscll(val)    do {  } while (0)
  70 #define TSC_UNSUPPORTED
  71 #endif
  72