urcu/arch_s390.h

   1 #ifndef _ARCH_S390_H
   2 #define _ARCH_S390_H
   3
   4 /*
   5  * Trivial definitions for the S390 architecture based on information from the
   6  * Principles of Operation "CPU Serialization" (5-91), "BRANCH ON CONDITION"
   7  * (7-25) and "STORE CLOCK" (7-169).
   8  *
   9  * Copyright (c) 2009 Novell, Inc.
  10  * Author: Jan Blunck <jblunck@suse.de>
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to
  14  * deal in the Software without restriction, including without limitation the
  15  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  16  * sell copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  25  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  27  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  28  * IN THE SOFTWARE.
  29  */
  30
  31 #include <compiler.h>
  32
  33 #define CONFIG_HAVE_MEM_COHERENCY
  34 /* Assume SMP machine, given we don't have this information */
  35 #define CONFIG_SMP 1
  36
  37 #ifndef BITS_PER_LONG
  38 #define BITS_PER_LONG   (__SIZEOF_LONG__ * 8)
  39 #endif
  40
  41 #define mb()    __asm__ __volatile__("bcr 15,0" : : : "memory")
  42 #define rmb()   __asm__ __volatile__("bcr 15,0" : : : "memory");
  43 #define wmb()   __asm__ __volatile__("bcr 15,0" : : : "memory");
  44 #define mc()    barrier()
  45 #define rmc()   barrier()
  46 #define wmc()   barrier()
  47
  48 #define smp_mb()        mb()
  49 #define smp_rmb()       rmb()
  50 #define smp_wmb()       wmb()
  51 #define smp_mc()        mc()
  52 #define smp_rmc()       rmc()
  53 #define smp_wmc()       wmc()
  54
  55 /* Nop everywhere except on alpha. */
  56 #define smp_read_barrier_depends()
  57
  58 static inline void cpu_relax(void)
  59 {
  60         barrier();
  61 }
  62
  63 static inline void sync_core()
  64 {
  65         __asm__ __volatile__("bcr 15,0" : : : "memory");
  66 }
  67
  68 typedef unsigned long long cycles_t;
  69
  70 static inline cycles_t get_cycles (void)
  71 {
  72         cycles_t cycles;
  73
  74         __asm__ __volatile__("stck %0" : "=m" (cycles) : : "cc", "memory" );
  75
  76         return cycles;
  77 }
  78
  79 #endif /* _ARCH_S390_H */