72af7e3baefbaea411d1a3622e8114fca7786e47
[urcu.git] / 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 */
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