include/asm-sparc/semaphore.h

   1 #ifndef _SPARC_SEMAPHORE_H
   2 #define _SPARC_SEMAPHORE_H
   3
   4 /* Dinky, good for nothing, just barely irq safe, Sparc semaphores. */
   5
   6 #ifdef __KERNEL__
   7
   8 #include <asm/atomic.h>
   9 #include <linux/wait.h>
  10 #include <linux/rwsem.h>
  11
  12 struct semaphore {
  13         atomic24_t count;
  14         int sleepers;
  15         wait_queue_head_t wait;
  16 };
  17
  18 #define __SEMAPHORE_INITIALIZER(name, n)                                \
  19 {                                                                       \
  20         .count          = ATOMIC24_INIT(n),                             \
  21         .sleepers       = 0,                                            \
  22         .wait           = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait)    \
  23 }
  24
  25 #define __MUTEX_INITIALIZER(name) \
  26         __SEMAPHORE_INITIALIZER(name,1)
  27
  28 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
  29         struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
  30
  31 #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
  32 #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0)
  33
  34 static inline void sema_init (struct semaphore *sem, int val)
  35 {
  36         atomic24_set(&sem->count, val);
  37         sem->sleepers = 0;
  38         init_waitqueue_head(&sem->wait);
  39 }
  40
  41 static inline void init_MUTEX (struct semaphore *sem)
  42 {
  43         sema_init(sem, 1);
  44 }
  45
  46 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
  47 {
  48         sema_init(sem, 0);
  49 }
  50
  51 extern void __down(struct semaphore * sem);
  52 extern int __down_interruptible(struct semaphore * sem);
  53 extern int __down_trylock(struct semaphore * sem);
  54 extern void __up(struct semaphore * sem);
  55
  56 static inline void down(struct semaphore * sem)
  57 {
  58         register volatile int *ptr asm("g1");
  59         register int increment asm("g2");
  60
  61         might_sleep();
  62
  63         ptr = &(sem->count.counter);
  64         increment = 1;
  65
  66         __asm__ __volatile__(
  67         "mov    %%o7, %%g4\n\t"
  68         "call   ___atomic24_sub\n\t"
  69         " add   %%o7, 8, %%o7\n\t"
  70         "tst    %%g2\n\t"
  71         "bl     2f\n\t"
  72         " nop\n"
  73         "1:\n\t"
  74         ".subsection 2\n"
  75         "2:\n\t"
  76         "save   %%sp, -64, %%sp\n\t"
  77         "mov    %%g1, %%l1\n\t"
  78         "mov    %%g5, %%l5\n\t"
  79         "call   %3\n\t"
  80         " mov   %%g1, %%o0\n\t"
  81         "mov    %%l1, %%g1\n\t"
  82         "ba     1b\n\t"
  83         " restore %%l5, %%g0, %%g5\n\t"
  84         ".previous\n"
  85         : "=&r" (increment)
  86         : "0" (increment), "r" (ptr), "i" (__down)
  87         : "g3", "g4", "g7", "memory", "cc");
  88 }
  89
  90 static inline int down_interruptible(struct semaphore * sem)
  91 {
  92         register volatile int *ptr asm("g1");
  93         register int increment asm("g2");
  94
  95         might_sleep();
  96
  97         ptr = &(sem->count.counter);
  98         increment = 1;
  99
 100         __asm__ __volatile__(
 101         "mov    %%o7, %%g4\n\t"
 102         "call   ___atomic24_sub\n\t"
 103         " add   %%o7, 8, %%o7\n\t"
 104         "tst    %%g2\n\t"
 105         "bl     2f\n\t"
 106         " clr   %%g2\n"
 107         "1:\n\t"
 108         ".subsection 2\n"
 109         "2:\n\t"
 110         "save   %%sp, -64, %%sp\n\t"
 111         "mov    %%g1, %%l1\n\t"
 112         "mov    %%g5, %%l5\n\t"
 113         "call   %3\n\t"
 114         " mov   %%g1, %%o0\n\t"
 115         "mov    %%l1, %%g1\n\t"
 116         "mov    %%l5, %%g5\n\t"
 117         "ba     1b\n\t"
 118         " restore %%o0, %%g0, %%g2\n\t"
 119         ".previous\n"
 120         : "=&r" (increment)
 121         : "0" (increment), "r" (ptr), "i" (__down_interruptible)
 122         : "g3", "g4", "g7", "memory", "cc");
 123
 124         return increment;
 125 }
 126
 127 static inline int down_trylock(struct semaphore * sem)
 128 {
 129         register volatile int *ptr asm("g1");
 130         register int increment asm("g2");
 131
 132         ptr = &(sem->count.counter);
 133         increment = 1;
 134
 135         __asm__ __volatile__(
 136         "mov    %%o7, %%g4\n\t"
 137         "call   ___atomic24_sub\n\t"
 138         " add   %%o7, 8, %%o7\n\t"
 139         "tst    %%g2\n\t"
 140         "bl     2f\n\t"
 141         " clr   %%g2\n"
 142         "1:\n\t"
 143         ".subsection 2\n"
 144         "2:\n\t"
 145         "save   %%sp, -64, %%sp\n\t"
 146         "mov    %%g1, %%l1\n\t"
 147         "mov    %%g5, %%l5\n\t"
 148         "call   %3\n\t"
 149         " mov   %%g1, %%o0\n\t"
 150         "mov    %%l1, %%g1\n\t"
 151         "mov    %%l5, %%g5\n\t"
 152         "ba     1b\n\t"
 153         " restore %%o0, %%g0, %%g2\n\t"
 154         ".previous\n"
 155         : "=&r" (increment)
 156         : "0" (increment), "r" (ptr), "i" (__down_trylock)
 157         : "g3", "g4", "g7", "memory", "cc");
 158
 159         return increment;
 160 }
 161
 162 static inline void up(struct semaphore * sem)
 163 {
 164         register volatile int *ptr asm("g1");
 165         register int increment asm("g2");
 166
 167         ptr = &(sem->count.counter);
 168         increment = 1;
 169
 170         __asm__ __volatile__(
 171         "mov    %%o7, %%g4\n\t"
 172         "call   ___atomic24_add\n\t"
 173         " add   %%o7, 8, %%o7\n\t"
 174         "tst    %%g2\n\t"
 175         "ble    2f\n\t"
 176         " nop\n"
 177         "1:\n\t"
 178         ".subsection 2\n"
 179         "2:\n\t"
 180         "save   %%sp, -64, %%sp\n\t"
 181         "mov    %%g1, %%l1\n\t"
 182         "mov    %%g5, %%l5\n\t"
 183         "call   %3\n\t"
 184         " mov   %%g1, %%o0\n\t"
 185         "mov    %%l1, %%g1\n\t"
 186         "ba     1b\n\t"
 187         " restore %%l5, %%g0, %%g5\n\t"
 188         ".previous\n"
 189         : "=&r" (increment)
 190         : "0" (increment), "r" (ptr), "i" (__up)
 191         : "g3", "g4", "g7", "memory", "cc");
 192 }
 193
 194 #endif /* __KERNEL__ */
 195
 196 #endif /* !(_SPARC_SEMAPHORE_H) */