diff options
Diffstat (limited to 'include/asm-ppc/spinlock.h')
-rw-r--r-- | include/asm-ppc/spinlock.h | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/include/asm-ppc/spinlock.h b/include/asm-ppc/spinlock.h deleted file mode 100644 index fccaf5531e57..000000000000 --- a/include/asm-ppc/spinlock.h +++ /dev/null | |||
@@ -1,168 +0,0 @@ | |||
1 | #ifndef __ASM_SPINLOCK_H | ||
2 | #define __ASM_SPINLOCK_H | ||
3 | |||
4 | #include <asm/system.h> | ||
5 | |||
6 | /* | ||
7 | * Simple spin lock operations. | ||
8 | * | ||
9 | * (the type definitions are in asm/raw_spinlock_types.h) | ||
10 | */ | ||
11 | |||
12 | #define __raw_spin_is_locked(x) ((x)->slock != 0) | ||
13 | #define __raw_spin_unlock_wait(lock) \ | ||
14 | do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0) | ||
15 | #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) | ||
16 | |||
17 | static inline void __raw_spin_lock(raw_spinlock_t *lock) | ||
18 | { | ||
19 | unsigned long tmp; | ||
20 | |||
21 | __asm__ __volatile__( | ||
22 | "b 1f # __raw_spin_lock\n\ | ||
23 | 2: lwzx %0,0,%1\n\ | ||
24 | cmpwi 0,%0,0\n\ | ||
25 | bne+ 2b\n\ | ||
26 | 1: lwarx %0,0,%1\n\ | ||
27 | cmpwi 0,%0,0\n\ | ||
28 | bne- 2b\n" | ||
29 | PPC405_ERR77(0,%1) | ||
30 | " stwcx. %2,0,%1\n\ | ||
31 | bne- 2b\n\ | ||
32 | isync" | ||
33 | : "=&r"(tmp) | ||
34 | : "r"(&lock->slock), "r"(1) | ||
35 | : "cr0", "memory"); | ||
36 | } | ||
37 | |||
38 | static inline void __raw_spin_unlock(raw_spinlock_t *lock) | ||
39 | { | ||
40 | __asm__ __volatile__("eieio # __raw_spin_unlock": : :"memory"); | ||
41 | lock->slock = 0; | ||
42 | } | ||
43 | |||
44 | #define __raw_spin_trylock(l) (!test_and_set_bit(0,(volatile unsigned long *)(&(l)->slock))) | ||
45 | |||
46 | /* | ||
47 | * Read-write spinlocks, allowing multiple readers | ||
48 | * but only one writer. | ||
49 | * | ||
50 | * NOTE! it is quite common to have readers in interrupts | ||
51 | * but no interrupt writers. For those circumstances we | ||
52 | * can "mix" irq-safe locks - any writer needs to get a | ||
53 | * irq-safe write-lock, but readers can get non-irqsafe | ||
54 | * read-locks. | ||
55 | */ | ||
56 | |||
57 | #define __raw_read_can_lock(rw) ((rw)->lock >= 0) | ||
58 | #define __raw_write_can_lock(rw) (!(rw)->lock) | ||
59 | |||
60 | static __inline__ int __raw_read_trylock(raw_rwlock_t *rw) | ||
61 | { | ||
62 | signed int tmp; | ||
63 | |||
64 | __asm__ __volatile__( | ||
65 | "2: lwarx %0,0,%1 # read_trylock\n\ | ||
66 | addic. %0,%0,1\n\ | ||
67 | ble- 1f\n" | ||
68 | PPC405_ERR77(0,%1) | ||
69 | " stwcx. %0,0,%1\n\ | ||
70 | bne- 2b\n\ | ||
71 | isync\n\ | ||
72 | 1:" | ||
73 | : "=&r"(tmp) | ||
74 | : "r"(&rw->lock) | ||
75 | : "cr0", "memory"); | ||
76 | |||
77 | return tmp > 0; | ||
78 | } | ||
79 | |||
80 | static __inline__ void __raw_read_lock(raw_rwlock_t *rw) | ||
81 | { | ||
82 | signed int tmp; | ||
83 | |||
84 | __asm__ __volatile__( | ||
85 | "b 2f # read_lock\n\ | ||
86 | 1: lwzx %0,0,%1\n\ | ||
87 | cmpwi 0,%0,0\n\ | ||
88 | blt+ 1b\n\ | ||
89 | 2: lwarx %0,0,%1\n\ | ||
90 | addic. %0,%0,1\n\ | ||
91 | ble- 1b\n" | ||
92 | PPC405_ERR77(0,%1) | ||
93 | " stwcx. %0,0,%1\n\ | ||
94 | bne- 2b\n\ | ||
95 | isync" | ||
96 | : "=&r"(tmp) | ||
97 | : "r"(&rw->lock) | ||
98 | : "cr0", "memory"); | ||
99 | } | ||
100 | |||
101 | static __inline__ void __raw_read_unlock(raw_rwlock_t *rw) | ||
102 | { | ||
103 | signed int tmp; | ||
104 | |||
105 | __asm__ __volatile__( | ||
106 | "eieio # read_unlock\n\ | ||
107 | 1: lwarx %0,0,%1\n\ | ||
108 | addic %0,%0,-1\n" | ||
109 | PPC405_ERR77(0,%1) | ||
110 | " stwcx. %0,0,%1\n\ | ||
111 | bne- 1b" | ||
112 | : "=&r"(tmp) | ||
113 | : "r"(&rw->lock) | ||
114 | : "cr0", "memory"); | ||
115 | } | ||
116 | |||
117 | static __inline__ int __raw_write_trylock(raw_rwlock_t *rw) | ||
118 | { | ||
119 | signed int tmp; | ||
120 | |||
121 | __asm__ __volatile__( | ||
122 | "2: lwarx %0,0,%1 # write_trylock\n\ | ||
123 | cmpwi 0,%0,0\n\ | ||
124 | bne- 1f\n" | ||
125 | PPC405_ERR77(0,%1) | ||
126 | " stwcx. %2,0,%1\n\ | ||
127 | bne- 2b\n\ | ||
128 | isync\n\ | ||
129 | 1:" | ||
130 | : "=&r"(tmp) | ||
131 | : "r"(&rw->lock), "r"(-1) | ||
132 | : "cr0", "memory"); | ||
133 | |||
134 | return tmp == 0; | ||
135 | } | ||
136 | |||
137 | static __inline__ void __raw_write_lock(raw_rwlock_t *rw) | ||
138 | { | ||
139 | signed int tmp; | ||
140 | |||
141 | __asm__ __volatile__( | ||
142 | "b 2f # write_lock\n\ | ||
143 | 1: lwzx %0,0,%1\n\ | ||
144 | cmpwi 0,%0,0\n\ | ||
145 | bne+ 1b\n\ | ||
146 | 2: lwarx %0,0,%1\n\ | ||
147 | cmpwi 0,%0,0\n\ | ||
148 | bne- 1b\n" | ||
149 | PPC405_ERR77(0,%1) | ||
150 | " stwcx. %2,0,%1\n\ | ||
151 | bne- 2b\n\ | ||
152 | isync" | ||
153 | : "=&r"(tmp) | ||
154 | : "r"(&rw->lock), "r"(-1) | ||
155 | : "cr0", "memory"); | ||
156 | } | ||
157 | |||
158 | static __inline__ void __raw_write_unlock(raw_rwlock_t *rw) | ||
159 | { | ||
160 | __asm__ __volatile__("eieio # write_unlock": : :"memory"); | ||
161 | rw->lock = 0; | ||
162 | } | ||
163 | |||
164 | #define _raw_spin_relax(lock) cpu_relax() | ||
165 | #define _raw_read_relax(lock) cpu_relax() | ||
166 | #define _raw_write_relax(lock) cpu_relax() | ||
167 | |||
168 | #endif /* __ASM_SPINLOCK_H */ | ||