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  1. #ifndef __LINUX_SPINLOCK_API_UP_H
  2. #define __LINUX_SPINLOCK_API_UP_H
  3.  
  4. #ifndef __LINUX_SPINLOCK_H
  5. # error "please don't include this file directly"
  6. #endif
  7.  
  8. /*
  9.  * include/linux/spinlock_api_up.h
  10.  *
  11.  * spinlock API implementation on UP-nondebug (inlined implementation)
  12.  *
  13.  * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
  14.  * Released under the General Public License (GPL).
  15.  */
  16.  
  17. #define in_lock_functions(ADDR)         0
  18.  
  19. #define assert_raw_spin_locked(lock)    do { (void)(lock); } while (0)
  20.  
  21. /*
  22.  * In the UP-nondebug case there's no real locking going on, so the
  23.  * only thing we have to do is to keep the preempt counts and irq
  24.  * flags straight, to suppress compiler warnings of unused lock
  25.  * variables, and to add the proper checker annotations:
  26.  */
  27. #define __LOCK(lock) \
  28.   do { preempt_disable(); __acquire(lock); (void)(lock); } while (0)
  29.  
  30. #define __LOCK_BH(lock) \
  31.   do { local_bh_disable(); __LOCK(lock); } while (0)
  32.  
  33. #define __LOCK_IRQ(lock) \
  34.   do { local_irq_disable(); __LOCK(lock); } while (0)
  35.  
  36. #define __LOCK_IRQSAVE(lock, flags) \
  37.   do {                              \
  38.      __asm__ __volatile__ (         \
  39.      "pushf\n\t"                    \
  40.      "popl %0\n\t"                  \
  41.      "cli\n"                        \
  42.      : "=r" (flags));               \
  43.       __LOCK(lock);                 \
  44.        } while (0)                  \
  45.  
  46. #define __UNLOCK(lock) \
  47.   do { preempt_enable(); __release(lock); (void)(lock); } while (0)
  48.  
  49. #define __UNLOCK_BH(lock) \
  50.   do { preempt_enable_no_resched(); local_bh_enable(); \
  51.           __release(lock); (void)(lock); } while (0)
  52.  
  53. #define __UNLOCK_IRQ(lock) \
  54.   do { local_irq_enable(); __UNLOCK(lock); } while (0)
  55.  
  56. #define __UNLOCK_IRQRESTORE(lock, flags)    \
  57.   do {                                      \
  58.      if (flags & (1<<9))                    \
  59.         __asm__ __volatile__ ("sti");       \
  60.       __UNLOCK(lock);                       \
  61.      } while (0)
  62.  
  63. #define _spin_lock(lock)                        __LOCK(lock)
  64. #define _spin_lock_nested(lock, subclass)       __LOCK(lock)
  65. #define _read_lock(lock)                        __LOCK(lock)
  66. #define _write_lock(lock)                       __LOCK(lock)
  67. #define _spin_lock_bh(lock)                     __LOCK_BH(lock)
  68. #define _read_lock_bh(lock)                     __LOCK_BH(lock)
  69. #define _write_lock_bh(lock)                    __LOCK_BH(lock)
  70. #define _spin_lock_irq(lock)                    __LOCK_IRQ(lock)
  71. #define _read_lock_irq(lock)                    __LOCK_IRQ(lock)
  72. #define _write_lock_irq(lock)                   __LOCK_IRQ(lock)
  73. #define _spin_lock_irqsave(lock, flags)         __LOCK_IRQSAVE(lock, flags)
  74. #define _read_lock_irqsave(lock, flags)         __LOCK_IRQSAVE(lock, flags)
  75. #define _write_lock_irqsave(lock, flags)        __LOCK_IRQSAVE(lock, flags)
  76. #define _spin_trylock(lock)                     ({ __LOCK(lock); 1; })
  77. #define _read_trylock(lock)                     ({ __LOCK(lock); 1; })
  78. #define _write_trylock(lock)                    ({ __LOCK(lock); 1; })
  79. #define _spin_trylock_bh(lock)                  ({ __LOCK_BH(lock); 1; })
  80. #define _spin_unlock(lock)                      __UNLOCK(lock)
  81. #define _read_unlock(lock)                      __UNLOCK(lock)
  82. #define _write_unlock(lock)                     __UNLOCK(lock)
  83. #define _spin_unlock_bh(lock)                   __UNLOCK_BH(lock)
  84. #define _write_unlock_bh(lock)                  __UNLOCK_BH(lock)
  85. #define _read_unlock_bh(lock)                   __UNLOCK_BH(lock)
  86. #define _spin_unlock_irq(lock)                  __UNLOCK_IRQ(lock)
  87. #define _read_unlock_irq(lock)                  __UNLOCK_IRQ(lock)
  88. #define _write_unlock_irq(lock)                 __UNLOCK_IRQ(lock)
  89. #define _spin_unlock_irqrestore(lock, flags)    __UNLOCK_IRQRESTORE(lock, flags)
  90. #define _read_unlock_irqrestore(lock, flags)    __UNLOCK_IRQRESTORE(lock, flags)
  91. #define _write_unlock_irqrestore(lock, flags)   __UNLOCK_IRQRESTORE(lock, flags)
  92.  
  93. #endif /* __LINUX_SPINLOCK_API_UP_H */
  94.