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1da177e4 LT |
1 | #ifndef _H8300_SEMAPHORE_H |
2 | #define _H8300_SEMAPHORE_H | |
3 | ||
4 | #define RW_LOCK_BIAS 0x01000000 | |
5 | ||
6 | #ifndef __ASSEMBLY__ | |
7 | ||
8 | #include <linux/linkage.h> | |
9 | #include <linux/wait.h> | |
10 | #include <linux/spinlock.h> | |
11 | #include <linux/rwsem.h> | |
12 | ||
13 | #include <asm/system.h> | |
14 | #include <asm/atomic.h> | |
15 | ||
16 | /* | |
17 | * Interrupt-safe semaphores.. | |
18 | * | |
19 | * (C) Copyright 1996 Linus Torvalds | |
20 | * | |
21 | * H8/300 version by Yoshinori Sato | |
22 | */ | |
23 | ||
24 | ||
25 | struct semaphore { | |
26 | atomic_t count; | |
27 | int sleepers; | |
28 | wait_queue_head_t wait; | |
29 | }; | |
30 | ||
31 | #define __SEMAPHORE_INITIALIZER(name, n) \ | |
32 | { \ | |
33 | .count = ATOMIC_INIT(n), \ | |
34 | .sleepers = 0, \ | |
35 | .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \ | |
36 | } | |
37 | ||
1da177e4 LT |
38 | #define __DECLARE_SEMAPHORE_GENERIC(name,count) \ |
39 | struct semaphore name = __SEMAPHORE_INITIALIZER(name,count) | |
40 | ||
41 | #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1) | |
1da177e4 LT |
42 | |
43 | static inline void sema_init (struct semaphore *sem, int val) | |
44 | { | |
45 | *sem = (struct semaphore)__SEMAPHORE_INITIALIZER(*sem, val); | |
46 | } | |
47 | ||
48 | static inline void init_MUTEX (struct semaphore *sem) | |
49 | { | |
50 | sema_init(sem, 1); | |
51 | } | |
52 | ||
53 | static inline void init_MUTEX_LOCKED (struct semaphore *sem) | |
54 | { | |
55 | sema_init(sem, 0); | |
56 | } | |
57 | ||
58 | asmlinkage void __down_failed(void /* special register calling convention */); | |
59 | asmlinkage int __down_failed_interruptible(void /* params in registers */); | |
60 | asmlinkage int __down_failed_trylock(void /* params in registers */); | |
61 | asmlinkage void __up_wakeup(void /* special register calling convention */); | |
62 | ||
63 | asmlinkage void __down(struct semaphore * sem); | |
64 | asmlinkage int __down_interruptible(struct semaphore * sem); | |
65 | asmlinkage int __down_trylock(struct semaphore * sem); | |
66 | asmlinkage void __up(struct semaphore * sem); | |
67 | ||
68 | extern spinlock_t semaphore_wake_lock; | |
69 | ||
70 | /* | |
71 | * This is ugly, but we want the default case to fall through. | |
72 | * "down_failed" is a special asm handler that calls the C | |
73 | * routine that actually waits. See arch/m68k/lib/semaphore.S | |
74 | */ | |
75 | static inline void down(struct semaphore * sem) | |
76 | { | |
77 | register atomic_t *count asm("er0"); | |
78 | ||
79 | might_sleep(); | |
80 | ||
81 | count = &(sem->count); | |
82 | __asm__ __volatile__( | |
83 | "stc ccr,r3l\n\t" | |
84 | "orc #0x80,ccr\n\t" | |
85 | "mov.l %2, er1\n\t" | |
86 | "dec.l #1,er1\n\t" | |
87 | "mov.l er1,%0\n\t" | |
88 | "bpl 1f\n\t" | |
89 | "ldc r3l,ccr\n\t" | |
90 | "mov.l %1,er0\n\t" | |
91 | "jsr @___down\n\t" | |
92 | "bra 2f\n" | |
93 | "1:\n\t" | |
94 | "ldc r3l,ccr\n" | |
95 | "2:" | |
96 | : "=m"(*count) | |
97 | : "g"(sem),"m"(*count) | |
98 | : "cc", "er1", "er2", "er3"); | |
99 | } | |
100 | ||
101 | static inline int down_interruptible(struct semaphore * sem) | |
102 | { | |
103 | register atomic_t *count asm("er0"); | |
104 | ||
105 | might_sleep(); | |
106 | ||
107 | count = &(sem->count); | |
108 | __asm__ __volatile__( | |
109 | "stc ccr,r1l\n\t" | |
110 | "orc #0x80,ccr\n\t" | |
111 | "mov.l %3, er2\n\t" | |
112 | "dec.l #1,er2\n\t" | |
113 | "mov.l er2,%1\n\t" | |
114 | "bpl 1f\n\t" | |
115 | "ldc r1l,ccr\n\t" | |
116 | "mov.l %2,er0\n\t" | |
117 | "jsr @___down_interruptible\n\t" | |
118 | "bra 2f\n" | |
119 | "1:\n\t" | |
120 | "ldc r1l,ccr\n\t" | |
121 | "sub.l %0,%0\n\t" | |
122 | "2:\n\t" | |
123 | : "=r" (count),"=m" (*count) | |
124 | : "g"(sem),"m"(*count) | |
125 | : "cc", "er1", "er2", "er3"); | |
126 | return (int)count; | |
127 | } | |
128 | ||
129 | static inline int down_trylock(struct semaphore * sem) | |
130 | { | |
131 | register atomic_t *count asm("er0"); | |
132 | ||
133 | count = &(sem->count); | |
134 | __asm__ __volatile__( | |
135 | "stc ccr,r3l\n\t" | |
136 | "orc #0x80,ccr\n\t" | |
137 | "mov.l %3,er2\n\t" | |
138 | "dec.l #1,er2\n\t" | |
139 | "mov.l er2,%0\n\t" | |
140 | "bpl 1f\n\t" | |
141 | "ldc r3l,ccr\n\t" | |
142 | "jmp @3f\n\t" | |
143 | LOCK_SECTION_START(".align 2\n\t") | |
144 | "3:\n\t" | |
145 | "mov.l %2,er0\n\t" | |
146 | "jsr @___down_trylock\n\t" | |
147 | "jmp @2f\n\t" | |
148 | LOCK_SECTION_END | |
149 | "1:\n\t" | |
150 | "ldc r3l,ccr\n\t" | |
151 | "sub.l %1,%1\n" | |
152 | "2:" | |
153 | : "=m" (*count),"=r"(count) | |
154 | : "g"(sem),"m"(*count) | |
155 | : "cc", "er1","er2", "er3"); | |
156 | return (int)count; | |
157 | } | |
158 | ||
159 | /* | |
160 | * Note! This is subtle. We jump to wake people up only if | |
161 | * the semaphore was negative (== somebody was waiting on it). | |
162 | * The default case (no contention) will result in NO | |
163 | * jumps for both down() and up(). | |
164 | */ | |
165 | static inline void up(struct semaphore * sem) | |
166 | { | |
167 | register atomic_t *count asm("er0"); | |
168 | ||
169 | count = &(sem->count); | |
170 | __asm__ __volatile__( | |
171 | "stc ccr,r3l\n\t" | |
172 | "orc #0x80,ccr\n\t" | |
173 | "mov.l %2,er1\n\t" | |
174 | "inc.l #1,er1\n\t" | |
175 | "mov.l er1,%0\n\t" | |
176 | "ldc r3l,ccr\n\t" | |
177 | "sub.l er2,er2\n\t" | |
178 | "cmp.l er2,er1\n\t" | |
179 | "bgt 1f\n\t" | |
180 | "mov.l %1,er0\n\t" | |
181 | "jsr @___up\n" | |
182 | "1:" | |
183 | : "=m"(*count) | |
184 | : "g"(sem),"m"(*count) | |
185 | : "cc", "er1", "er2", "er3"); | |
186 | } | |
187 | ||
188 | #endif /* __ASSEMBLY__ */ | |
189 | ||
190 | #endif |