include/asm-sh/spinlock.h

   1 #ifndef __ASM_SH_SPINLOCK_H
   2 #define __ASM_SH_SPINLOCK_H
   3
   4 /*
   5  * These are the generic versions of the spinlocks
   6  * and read-write locks.. We should actually do a
   7  * <linux/spinlock.h> with all of this. Oh, well.
   8  */
   9 #define spin_lock_irqsave(lock, flags)          do { local_irq_save(flags);       spin_lock(lock); } while (0)
  10 #define spin_lock_irq(lock)                     do { local_irq_disable();         spin_lock(lock); } while (0)
  11 #define spin_lock_bh(lock)                      do { local_bh_disable();          spin_lock(lock); } while (0)
  12
  13 #define read_lock_irqsave(lock, flags)          do { local_irq_save(flags);       read_lock(lock); } while (0)
  14 #define read_lock_irq(lock)                     do { local_irq_disable();         read_lock(lock); } while (0)
  15 #define read_lock_bh(lock)                      do { local_bh_disable();          read_lock(lock); } while (0)
  16
  17 #define write_lock_irqsave(lock, flags)         do { local_irq_save(flags);      write_lock(lock); } while (0)
  18 #define write_lock_irq(lock)                    do { local_irq_disable();        write_lock(lock); } while (0)
  19 #define write_lock_bh(lock)                     do { local_bh_disable();         write_lock(lock); } while (0)
  20
  21 #define spin_unlock_irqrestore(lock, flags)     do { spin_unlock(lock);  local_irq_restore(flags); } while (0)
  22 #define spin_unlock_irq(lock)                   do { spin_unlock(lock);  local_irq_enable();       } while (0)
  23 #define spin_unlock_bh(lock)                    do { spin_unlock(lock);  local_bh_enable();        } while (0)
  24
  25 #define read_unlock_irqrestore(lock, flags)     do { read_unlock(lock);  local_irq_restore(flags); } while (0)
  26 #define read_unlock_irq(lock)                   do { read_unlock(lock);  local_irq_enable();       } while (0)
  27 #define read_unlock_bh(lock)                    do { read_unlock(lock);  local_bh_enable();        } while (0)
  28
  29 #define write_unlock_irqrestore(lock, flags)    do { write_unlock(lock); local_irq_restore(flags); } while (0)
  30 #define write_unlock_irq(lock)                  do { write_unlock(lock); local_irq_enable();       } while (0)
  31 #define write_unlock_bh(lock)                   do { write_unlock(lock); local_bh_enable();        } while (0)
  32
  33 #ifndef __SMP__
  34
  35 #define DEBUG_SPINLOCKS 0       /* 0 == no debugging, 1 == maintain lock state, 2 == full debug */
  36
  37 #if (DEBUG_SPINLOCKS < 1)
  38
  39 /*
  40  * Your basic spinlocks, allowing only a single CPU anywhere
  41  */
  42 typedef struct { } spinlock_t;
  43 #define SPIN_LOCK_UNLOCKED (spinlock_t) { }
  44
  45 #define spin_lock_init(lock)    do { } while(0)
  46 #define spin_lock(lock)         (void)(lock) /* Not "unused variable". */
  47 #define spin_trylock(lock)      (1)
  48 #define spin_unlock_wait(lock)  do { } while(0)
  49 #define spin_unlock(lock)       do { } while(0)
  50
  51 #elif (DEBUG_SPINLOCKS < 2)
  52
  53 typedef struct {
  54         volatile unsigned int lock;
  55 } spinlock_t;
  56 #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
  57
  58 #define spin_lock_init(x)       do { (x)->lock = 0; } while (0)
  59 #define spin_trylock(lock)      (!test_and_set_bit(0,(lock)))
  60
  61 #define spin_lock(x)            do { (x)->lock = 1; } while (0)
  62 #define spin_unlock_wait(x)     do { } while (0)
  63 #define spin_unlock(x)          do { (x)->lock = 0; } while (0)
  64
  65 #else /* (DEBUG_SPINLOCKS >= 2) */
  66
  67 typedef struct {
  68         volatile unsigned int lock;
  69         volatile unsigned int babble;
  70         const char *module;
  71 } spinlock_t;
  72 #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 25, __BASE_FILE__ }
  73
  74 #include <linux/kernel.h>
  75
  76 #define spin_lock_init(x)       do { (x)->lock = 0; } while (0)
  77 #define spin_trylock(lock)      (!test_and_set_bit(0,(lock)))
  78
  79 #define spin_lock(x)            do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_lock(%s:%p) already locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 1; restore_flags(__spinflags);} while (0)
  80 #define spin_unlock_wait(x)     do {unsigned long __spinflags; save_flags(__spinflags); cli(); if ((x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock_wait(%s:%p) deadlock\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} restore_flags(__spinflags);} while (0)
  81 #define spin_unlock(x)          do {unsigned long __spinflags; save_flags(__spinflags); cli(); if (!(x)->lock&&(x)->babble) {printk("%s:%d: spin_unlock(%s:%p) not locked\n", __BASE_FILE__,__LINE__, (x)->module, (x));(x)->babble--;} (x)->lock = 0; restore_flags(__spinflags);} while (0)
  82
  83 #endif  /* DEBUG_SPINLOCKS */
  84
  85 /*
  86  * Read-write spinlocks, allowing multiple readers
  87  * but only one writer.
  88  *
  89  * NOTE! it is quite common to have readers in interrupts
  90  * but no interrupt writers. For those circumstances we
  91  * can "mix" irq-safe locks - any writer needs to get a
  92  * irq-safe write-lock, but readers can get non-irqsafe
  93  * read-locks.
  94  */
  95 typedef struct { } rwlock_t;
  96 #define RW_LOCK_UNLOCKED (rwlock_t) { }
  97
  98 #define read_lock(lock)         (void)(lock) /* Not "unused variable". */
  99 #define read_unlock(lock)       do { } while(0)
 100 #define write_lock(lock)        (void)(lock) /* Not "unused variable". */
 101 #define write_unlock(lock)      do { } while(0)
 102
 103 #else
 104
 105 #error "No SMP on SH"
 106
 107 #endif /* SMP */
 108 #endif /* __ASM_SH_SPINLOCK_H */