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1 | #ifndef _ARCH_S390_H |
2 | #define _ARCH_S390_H | |
3 | ||
4 | /* | |
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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). | |
ac26f1a8 | 8 | * |
7039fa6f | 9 | * Copyright (c) 2009 Novell, Inc. |
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10 | * Author: Jan Blunck <jblunck@suse.de> |
11 | * | |
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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: | |
ac26f1a8 | 18 | * |
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19 | * The above copyright notice and this permission notice shall be included in |
20 | * all copies or substantial portions of the Software. | |
ac26f1a8 | 21 | * |
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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. | |
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29 | */ |
30 | ||
31 | #include <compiler.h> | |
32 | #include <arch_atomic.h> | |
33 | ||
34 | #define CONFIG_HAVE_MEM_COHERENCY | |
35 | /* Assume SMP machine, given we don't have this information */ | |
36 | #define CONFIG_SMP 1 | |
37 | ||
38 | #ifndef BITS_PER_LONG | |
39 | #define BITS_PER_LONG (__SIZEOF_LONG__ * 8) | |
40 | #endif | |
41 | ||
42 | #define mb() __asm__ __volatile__("bcr 15,0" : : : "memory") | |
43 | #define rmb() __asm__ __volatile__("bcr 15,0" : : : "memory"); | |
44 | #define wmb() __asm__ __volatile__("bcr 15,0" : : : "memory"); | |
45 | #define mc() barrier() | |
46 | #define rmc() barrier() | |
47 | #define wmc() barrier() | |
48 | ||
49 | #define smp_mb() mb() | |
50 | #define smp_rmb() rmb() | |
51 | #define smp_wmb() wmb() | |
52 | #define smp_mc() mc() | |
53 | #define smp_rmc() rmc() | |
54 | #define smp_wmc() wmc() | |
55 | ||
56 | /* Nop everywhere except on alpha. */ | |
57 | #define smp_read_barrier_depends() | |
58 | ||
59 | static inline void cpu_relax(void) | |
60 | { | |
61 | barrier(); | |
62 | } | |
63 | ||
64 | static inline void sync_core() | |
65 | { | |
66 | __asm__ __volatile__("bcr 15,0" : : : "memory"); | |
67 | } | |
68 | ||
69 | typedef unsigned long long cycles_t; | |
70 | ||
71 | static inline cycles_t get_cycles (void) | |
72 | { | |
73 | cycles_t cycles; | |
74 | ||
75 | __asm__ __volatile__("stck %0" : "=m" (cycles) : : "cc", "memory" ); | |
76 | ||
77 | return cycles; | |
78 | } | |
79 | ||
80 | #endif /* _ARCH_S390_H */ |