urcu/arch_sparc64.h

   1 #ifndef _URCU_ARCH_SPARC64_H
   2 #define _URCU_ARCH_SPARC64_H
   3
   4 /*
   5  * arch_sparc64.h: trivial definitions for the Sparc64 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 #define CONFIG_HAVE_MEM_COHERENCY
  33
  34 #define CACHE_LINE_SIZE 256
  35
  36 #ifndef BITS_PER_LONG
  37 #define BITS_PER_LONG   (__SIZEOF_LONG__ * 8)
  38 #endif
  39
  40 /*
  41  * Inspired from the Linux kernel. Workaround Spitfire bug #51.
  42  */
  43 #define membar_safe(type)                       \
  44 __asm__ __volatile__("ba,pt %%xcc, 1f\n\t"      \
  45                      "membar " type "\n"        \
  46                      "1:\n"                     \
  47                      : : : "memory")
  48
  49 #define mb()    membar_safe("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
  50 #define rmb()    membar_safe("#LoadLoad")
  51 #define wmb()    membar_safe("#StoreStore")
  52
  53 /*
  54  * Architectures without cache coherency need something like the following:
  55  *
  56  * #define mb()         mc()
  57  * #define rmb()        rmc()
  58  * #define wmb()        wmc()
  59  * #define mc()         arch_cache_flush()
  60  * #define rmc()        arch_cache_flush_read()
  61  * #define wmc()        arch_cache_flush_write()
  62  */
  63
  64 #define mc()    barrier()
  65 #define rmc()   barrier()
  66 #define wmc()   barrier()
  67
  68 #ifdef CONFIG_URCU_SMP
  69 #define smp_mb()        mb()
  70 #define smp_rmb()       rmb()
  71 #define smp_wmb()       wmb()
  72 #define smp_mc()        mc()
  73 #define smp_rmc()       rmc()
  74 #define smp_wmc()       wmc()
  75 #else
  76 #define smp_mb()        barrier()
  77 #define smp_rmb()       barrier()
  78 #define smp_wmb()       barrier()
  79 #define smp_mc()        barrier()
  80 #define smp_rmc()       barrier()
  81 #define smp_wmc()       barrier()
  82 #endif
  83
  84 /* Nop everywhere except on alpha. */
  85 #define smp_read_barrier_depends()
  86
  87 static inline void cpu_relax(void)
  88 {
  89         barrier();
  90 }
  91
  92 /*
  93  * Serialize core instruction execution. Also acts as a compiler barrier.
  94  */
  95 static inline void sync_core()
  96 {
  97         mb();
  98 }
  99
 100 typedef unsigned long long cycles_t;
 101
 102 static inline cycles_t get_cycles (void)
 103 {
 104         return 0;       /* unimplemented */
 105 }
 106
 107 #ifdef __cplusplus
 108 }
 109 #endif
 110
 111 #endif /* _URCU_ARCH_SPARC64_H */