Add S390 architecture specific headers
[urcu.git] / arch_s390.h
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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
49static inline void cpu_relax(void)
50{
51 barrier();
52}
53
54static inline void sync_core()
55{
56 __asm__ __volatile__("bcr 15,0" : : : "memory");
57}
58
59typedef unsigned long long cycles_t;
60
61static 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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