Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / mn10300 / include / asm / rwlock.h
blob6d594d4a0e10c22c2c8294b415785ce82a563a59
1 /*
2 * Helpers used by both rw spinlocks and rw semaphores.
4 * Based in part on code from semaphore.h and
5 * spinlock.h Copyright 1996 Linus Torvalds.
7 * Copyright 1999 Red Hat, Inc.
9 * Written by Benjamin LaHaise.
11 * Modified by Matsushita Electric Industrial Co., Ltd.
12 * Modifications:
13 * 13-Nov-2006 MEI Temporarily delete lock functions for SMP support.
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the Free
17 * Software Foundation; either version 2 of the License, or (at your option)
18 * any later version.
20 #ifndef _ASM_RWLOCK_H
21 #define _ASM_RWLOCK_H
23 #define RW_LOCK_BIAS 0x01000000
25 #ifndef CONFIG_SMP
27 typedef struct { unsigned long a[100]; } __dummy_lock_t;
28 #define __dummy_lock(lock) (*(__dummy_lock_t *)(lock))
30 #define RW_LOCK_BIAS_STR "0x01000000"
32 #define __build_read_lock_ptr(rw, helper) \
33 do { \
34 asm volatile( \
35 " mov (%0),d3 \n" \
36 " sub 1,d3 \n" \
37 " mov d3,(%0) \n" \
38 " blt 1f \n" \
39 " bra 2f \n" \
40 "1: jmp 3f \n" \
41 "2: \n" \
42 " .section .text.lock,\"ax\" \n" \
43 "3: call "helper"[],0 \n" \
44 " jmp 2b \n" \
45 " .previous" \
46 : \
47 : "d" (rw) \
48 : "memory", "d3", "cc"); \
49 } while (0)
51 #define __build_read_lock_const(rw, helper) \
52 do { \
53 asm volatile( \
54 " mov (%0),d3 \n" \
55 " sub 1,d3 \n" \
56 " mov d3,(%0) \n" \
57 " blt 1f \n" \
58 " bra 2f \n" \
59 "1: jmp 3f \n" \
60 "2: \n" \
61 " .section .text.lock,\"ax\" \n" \
62 "3: call "helper"[],0 \n" \
63 " jmp 2b \n" \
64 " .previous" \
65 : \
66 : "d" (rw) \
67 : "memory", "d3", "cc"); \
68 } while (0)
70 #define __build_read_lock(rw, helper) \
71 do { \
72 if (__builtin_constant_p(rw)) \
73 __build_read_lock_const(rw, helper); \
74 else \
75 __build_read_lock_ptr(rw, helper); \
76 } while (0)
78 #define __build_write_lock_ptr(rw, helper) \
79 do { \
80 asm volatile( \
81 " mov (%0),d3 \n" \
82 " sub 1,d3 \n" \
83 " mov d3,(%0) \n" \
84 " blt 1f \n" \
85 " bra 2f \n" \
86 "1: jmp 3f \n" \
87 "2: \n" \
88 " .section .text.lock,\"ax\" \n" \
89 "3: call "helper"[],0 \n" \
90 " jmp 2b \n" \
91 " .previous" \
92 : \
93 : "d" (rw) \
94 : "memory", "d3", "cc"); \
95 } while (0)
97 #define __build_write_lock_const(rw, helper) \
98 do { \
99 asm volatile( \
100 " mov (%0),d3 \n" \
101 " sub 1,d3 \n" \
102 " mov d3,(%0) \n" \
103 " blt 1f \n" \
104 " bra 2f \n" \
105 "1: jmp 3f \n" \
106 "2: \n" \
107 " .section .text.lock,\"ax\" \n" \
108 "3: call "helper"[],0 \n" \
109 " jmp 2b \n" \
110 " .previous" \
112 : "d" (rw) \
113 : "memory", "d3", "cc"); \
114 } while (0)
116 #define __build_write_lock(rw, helper) \
117 do { \
118 if (__builtin_constant_p(rw)) \
119 __build_write_lock_const(rw, helper); \
120 else \
121 __build_write_lock_ptr(rw, helper); \
122 } while (0)
124 #endif /* CONFIG_SMP */
125 #endif /* _ASM_RWLOCK_H */