59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
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/* ------------------------------- **
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** Atomic locking for MIPS **
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** ------------------------------- */
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/* This code is stolen from the Linux kernel */
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typedef struct { unsigned long a[100]; } __dummy_lock_t;
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#define __dummy_lock(lock) (*(__dummy_lock_t *)(lock))
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#define load_linked(addr) \
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({ \
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unsigned int __res; \
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\
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__asm__ __volatile__( \
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"ll\t%0,(%1)" \
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: "=r" (__res) \
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: "r" ((unsigned long) (addr))); \
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\
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__res; \
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})
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#define store_conditional(addr,value) \
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({ \
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int __res; \
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\
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__asm__ __volatile__( \
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"sc\t%0,(%2)" \
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: "=r" (__res) \
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: "0" (value), "r" (addr)); \
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\
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__res; \
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})
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#define INIT_LOCK(LOCK_VAR) ((LOCK_VAR) = 0)
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#define TRY_LOCK(LOCK_PTR) (!test_and_set_bit(0,(__dumy_lock_t *)(LOCK_PTR)))
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#define LOCK(LOCK_VAR) _spin_lock((__dummy_lock_t *)(&(LOCK_VAR)))
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#define IS_LOCKED(LOCK_VAR) ((LOCK_VAR) != 0)
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#define IS_UNLOCKED(LOCK_VAR) ((LOCK_VAR) == 0)
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/* We need to support sync on MIPS */
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#define UNLOCK(LOCK_VAR) spin_unlock((__dummy_lock_t *)(&(LOCK_VAR)))
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typedef struct {
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volatile unsigned int lock;
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} rwlock_t;
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#define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
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#define READ_LOCK(X) _read_lock(&(X))
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#define READ_UNLOCK(X) _read_unlock(&(X))
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#define WRITE_LOCK(X) _write_lock(&(X))
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#define WRITE_UNLOCK(X) _write_unlock(&(X))
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#define INIT_RWLOCK(RW) (RW) = RW_LOCK_UNLOCKED
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