Commit | Line | Data |
---|---|---|
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) | |
42 | #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0) | |
43 | ||
44 | static inline void sema_init (struct semaphore *sem, int val) | |
45 | { | |
46 | *sem = (struct semaphore)__SEMAPHORE_INITIALIZER(*sem, val); | |
47 | } | |
48 | ||
49 | static inline void init_MUTEX (struct semaphore *sem) | |
50 | { | |
51 | sema_init(sem, 1); | |
52 | } | |
53 | ||
54 | static inline void init_MUTEX_LOCKED (struct semaphore *sem) | |
55 | { | |
56 | sema_init(sem, 0); | |
57 | } | |
58 | ||
59 | asmlinkage void __down_failed(void /* special register calling convention */); | |
60 | asmlinkage int __down_failed_interruptible(void /* params in registers */); | |
61 | asmlinkage int __down_failed_trylock(void /* params in registers */); | |
62 | asmlinkage void __up_wakeup(void /* special register calling convention */); | |
63 | ||
64 | asmlinkage void __down(struct semaphore * sem); | |
65 | asmlinkage int __down_interruptible(struct semaphore * sem); | |
66 | asmlinkage int __down_trylock(struct semaphore * sem); | |
67 | asmlinkage void __up(struct semaphore * sem); | |
68 | ||
69 | extern spinlock_t semaphore_wake_lock; | |
70 | ||
71 | /* | |
72 | * This is ugly, but we want the default case to fall through. | |
73 | * "down_failed" is a special asm handler that calls the C | |
74 | * routine that actually waits. See arch/m68k/lib/semaphore.S | |
75 | */ | |
76 | static inline void down(struct semaphore * sem) | |
77 | { | |
78 | register atomic_t *count asm("er0"); | |
79 | ||
80 | might_sleep(); | |
81 | ||
82 | count = &(sem->count); | |
83 | __asm__ __volatile__( | |
84 | "stc ccr,r3l\n\t" | |
85 | "orc #0x80,ccr\n\t" | |
86 | "mov.l %2, er1\n\t" | |
87 | "dec.l #1,er1\n\t" | |
88 | "mov.l er1,%0\n\t" | |
89 | "bpl 1f\n\t" | |
90 | "ldc r3l,ccr\n\t" | |
91 | "mov.l %1,er0\n\t" | |
92 | "jsr @___down\n\t" | |
93 | "bra 2f\n" | |
94 | "1:\n\t" | |
95 | "ldc r3l,ccr\n" | |
96 | "2:" | |
97 | : "=m"(*count) | |
98 | : "g"(sem),"m"(*count) | |
99 | : "cc", "er1", "er2", "er3"); | |
100 | } | |
101 | ||
102 | static inline int down_interruptible(struct semaphore * sem) | |
103 | { | |
104 | register atomic_t *count asm("er0"); | |
105 | ||
106 | might_sleep(); | |
107 | ||
108 | count = &(sem->count); | |
109 | __asm__ __volatile__( | |
110 | "stc ccr,r1l\n\t" | |
111 | "orc #0x80,ccr\n\t" | |
112 | "mov.l %3, er2\n\t" | |
113 | "dec.l #1,er2\n\t" | |
114 | "mov.l er2,%1\n\t" | |
115 | "bpl 1f\n\t" | |
116 | "ldc r1l,ccr\n\t" | |
117 | "mov.l %2,er0\n\t" | |
118 | "jsr @___down_interruptible\n\t" | |
119 | "bra 2f\n" | |
120 | "1:\n\t" | |
121 | "ldc r1l,ccr\n\t" | |
122 | "sub.l %0,%0\n\t" | |
123 | "2:\n\t" | |
124 | : "=r" (count),"=m" (*count) | |
125 | : "g"(sem),"m"(*count) | |
126 | : "cc", "er1", "er2", "er3"); | |
127 | return (int)count; | |
128 | } | |
129 | ||
130 | static inline int down_trylock(struct semaphore * sem) | |
131 | { | |
132 | register atomic_t *count asm("er0"); | |
133 | ||
134 | count = &(sem->count); | |
135 | __asm__ __volatile__( | |
136 | "stc ccr,r3l\n\t" | |
137 | "orc #0x80,ccr\n\t" | |
138 | "mov.l %3,er2\n\t" | |
139 | "dec.l #1,er2\n\t" | |
140 | "mov.l er2,%0\n\t" | |
141 | "bpl 1f\n\t" | |
142 | "ldc r3l,ccr\n\t" | |
143 | "jmp @3f\n\t" | |
144 | LOCK_SECTION_START(".align 2\n\t") | |
145 | "3:\n\t" | |
146 | "mov.l %2,er0\n\t" | |
147 | "jsr @___down_trylock\n\t" | |
148 | "jmp @2f\n\t" | |
149 | LOCK_SECTION_END | |
150 | "1:\n\t" | |
151 | "ldc r3l,ccr\n\t" | |
152 | "sub.l %1,%1\n" | |
153 | "2:" | |
154 | : "=m" (*count),"=r"(count) | |
155 | : "g"(sem),"m"(*count) | |
156 | : "cc", "er1","er2", "er3"); | |
157 | return (int)count; | |
158 | } | |
159 | ||
160 | /* | |
161 | * Note! This is subtle. We jump to wake people up only if | |
162 | * the semaphore was negative (== somebody was waiting on it). | |
163 | * The default case (no contention) will result in NO | |
164 | * jumps for both down() and up(). | |
165 | */ | |
166 | static inline void up(struct semaphore * sem) | |
167 | { | |
168 | register atomic_t *count asm("er0"); | |
169 | ||
170 | count = &(sem->count); | |
171 | __asm__ __volatile__( | |
172 | "stc ccr,r3l\n\t" | |
173 | "orc #0x80,ccr\n\t" | |
174 | "mov.l %2,er1\n\t" | |
175 | "inc.l #1,er1\n\t" | |
176 | "mov.l er1,%0\n\t" | |
177 | "ldc r3l,ccr\n\t" | |
178 | "sub.l er2,er2\n\t" | |
179 | "cmp.l er2,er1\n\t" | |
180 | "bgt 1f\n\t" | |
181 | "mov.l %1,er0\n\t" | |
182 | "jsr @___up\n" | |
183 | "1:" | |
184 | : "=m"(*count) | |
185 | : "g"(sem),"m"(*count) | |
186 | : "cc", "er1", "er2", "er3"); | |
187 | } | |
188 | ||
189 | #endif /* __ASSEMBLY__ */ | |
190 | ||
191 | #endif |