arch_s390.h

   1 #ifndef _ARCH_S390_H
   2 #define _ARCH_S390_H
   3
   4 /*
   5  * Trivial definitions for the S390 architecture.
   6  *
   7  * Copyright (C) 2009 Novell, Inc.
   8  * Author: Jan Blunck <jblunck@suse.de>
   9  *
  10  * Based on the Principles of Operation "CPU Serialization" (5-91), "BRANCH ON
  11  * CONDITION" (7-25) and "STORE CLOCK" (7-169).
  12  *
  13  * Inspired by arch_ppc.h which is:
  14  * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
  15  *
  16  * This program is free software; you can redistribute it and/or modify it
  17  * under the terms of the GNU Lesser General Public License version 2.1 as
  18  * published by the Free  Software Foundation.
  19  */
  20
  21 #include <compiler.h>
  22 #include <arch_atomic.h>
  23
  24 #define CONFIG_HAVE_MEM_COHERENCY
  25 /* Assume SMP machine, given we don't have this information */
  26 #define CONFIG_SMP 1
  27
  28 #ifndef BITS_PER_LONG
  29 #define BITS_PER_LONG   (__SIZEOF_LONG__ * 8)
  30 #endif
  31
  32 #define mb()    __asm__ __volatile__("bcr 15,0" : : : "memory")
  33 #define rmb()   __asm__ __volatile__("bcr 15,0" : : : "memory");
  34 #define wmb()   __asm__ __volatile__("bcr 15,0" : : : "memory");
  35 #define mc()    barrier()
  36 #define rmc()   barrier()
  37 #define wmc()   barrier()
  38
  39 #define smp_mb()        mb()
  40 #define smp_rmb()       rmb()
  41 #define smp_wmb()       wmb()
  42 #define smp_mc()        mc()
  43 #define smp_rmc()       rmc()
  44 #define smp_wmc()       wmc()
  45
  46 /* Nop everywhere except on alpha. */
  47 #define smp_read_barrier_depends()
  48
  49 static inline void cpu_relax(void)
  50 {
  51         barrier();
  52 }
  53
  54 static inline void sync_core()
  55 {
  56         __asm__ __volatile__("bcr 15,0" : : : "memory");
  57 }
  58
  59 typedef unsigned long long cycles_t;
  60
  61 static inline cycles_t get_cycles (void)
  62 {
  63         cycles_t cycles;
  64
  65         __asm__ __volatile__("stck %0" : "=m" (cycles) : : "cc", "memory" );
  66
  67         return cycles;
  68 }
  69
  70 #endif /* _ARCH_S390_H */