urcu/arch_ppc.h

   1 #ifndef _URCU_ARCH_PPC_H
   2 #define _URCU_ARCH_PPC_H
   3
   4 /*
   5  * arch_ppc.h: trivial definitions for the powerpc architecture.
   6  *
   7  * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
   8  * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14 *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 #include <urcu/compiler.h>
  26 #include <urcu/config.h>
  27
  28 #ifdef __cplusplus
  29 extern "C" {
  30 #endif
  31
  32 /* Include size of POWER5+ L3 cache lines: 256 bytes */
  33 #define CACHE_LINE_SIZE 256
  34
  35 #ifndef BITS_PER_LONG
  36 #define BITS_PER_LONG   (__SIZEOF_LONG__ * 8)
  37 #endif
  38
  39 #define mb()    asm volatile("sync":::"memory")
  40
  41 /*
  42  * Serialize core instruction execution. Also acts as a compiler barrier.
  43  */
  44 #define sync_core()     asm volatile("isync" : : : "memory")
  45
  46 #define mftbl()                                         \
  47         ({                                              \
  48                 unsigned long rval;                     \
  49                 asm volatile("mftbl %0" : "=r" (rval)); \
  50                 rval;                                   \
  51         })
  52
  53 #define mftbu()                                         \
  54         ({                                              \
  55                 unsigned long rval;                     \
  56                 asm volatile("mftbu %0" : "=r" (rval)); \
  57                 rval;                                   \
  58         })
  59
  60 typedef unsigned long long cycles_t;
  61
  62 static inline cycles_t get_cycles (void)
  63 {
  64         long h, l;
  65
  66         for (;;) {
  67                 h = mftbu();
  68                 barrier();
  69                 l = mftbl();
  70                 barrier();
  71                 if (mftbu() == h)
  72                         return (((cycles_t) h) << 32) + l;
  73         }
  74 }
  75
  76 #ifdef __cplusplus
  77 }
  78 #endif
  79
  80 #include <urcu/arch_generic.h>
  81
  82 #endif /* _URCU_ARCH_PPC_H */