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@efficios.com>
   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 CAA_CACHE_LINE_SIZE     256
  34
  35 #define cmm_mb()    asm volatile("sync":::"memory")
  36
  37 #define mftbl()                                         \
  38         ({                                              \
  39                 unsigned long rval;                     \
  40                 asm volatile("mftbl %0" : "=r" (rval)); \
  41                 rval;                                   \
  42         })
  43
  44 #define mftbu()                                         \
  45         ({                                              \
  46                 unsigned long rval;                     \
  47                 asm volatile("mftbu %0" : "=r" (rval)); \
  48                 rval;                                   \
  49         })
  50
  51 #define mftb()                                          \
  52         ({                                              \
  53                 unsigned long long rval;                \
  54                 asm volatile("mftb %0" : "=r" (rval));  \
  55                 rval;                                   \
  56         })
  57
  58 typedef unsigned long long cycles_t;
  59
  60 #ifdef __powerpc64__
  61 static inline cycles_t caa_get_cycles(void)
  62 {
  63         return (cycles_t) mftb();
  64 }
  65 #else
  66 static inline cycles_t caa_get_cycles(void)
  67 {
  68         unsigned long h, l;
  69
  70         for (;;) {
  71                 h = mftbu();
  72                 cmm_barrier();
  73                 l = mftbl();
  74                 cmm_barrier();
  75                 if (mftbu() == h)
  76                         return (((cycles_t) h) << 32) + l;
  77         }
  78 }
  79 #endif
  80
  81 #ifdef __cplusplus
  82 }
  83 #endif
  84
  85 #include <urcu/arch/generic.h>
  86
  87 #endif /* _URCU_ARCH_PPC_H */