Revision eb51d102 cpu-i386.h
b/cpu-i386.h | ||
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542 | 542 |
#define offsetof(type, field) ((size_t) &((type *)0)->field) |
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#endif |
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#ifdef __powerpc__ |
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static inline int testandset (int *p) |
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{ |
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int ret; |
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__asm__ __volatile__ ( |
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"0: lwarx %0,0,%1 ;" |
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" xor. %0,%3,%0;" |
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" bne 1f;" |
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" stwcx. %2,0,%1;" |
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" bne- 0b;" |
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"1: " |
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: "=&r" (ret) |
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: "r" (p), "r" (1), "r" (0) |
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: "cr0", "memory"); |
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return ret; |
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} |
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#endif |
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#ifdef __i386__ |
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static inline int testandset (int *p) |
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{ |
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char ret; |
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long int readval; |
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__asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" |
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: "=q" (ret), "=m" (*p), "=a" (readval) |
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: "r" (1), "m" (*p), "a" (0) |
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: "memory"); |
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return ret; |
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} |
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#endif |
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#ifdef __s390__ |
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static inline int testandset (int *p) |
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{ |
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int ret; |
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__asm__ __volatile__ ("0: cs %0,%1,0(%2)\n" |
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" jl 0b" |
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: "=&d" (ret) |
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: "r" (1), "a" (p), "0" (*p) |
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: "cc", "memory" ); |
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return ret; |
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} |
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#endif |
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|
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#ifdef __alpha__ |
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int testandset (int *p) |
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{ |
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int ret; |
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unsigned long one; |
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|
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__asm__ __volatile__ ("0: mov 1,%2\n" |
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" ldl_l %0,%1\n" |
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" stl_c %2,%1\n" |
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" beq %2,1f\n" |
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".subsection 2\n" |
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"1: br 0b\n" |
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".previous" |
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: "=r" (ret), "=m" (*p), "=r" (one) |
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: "m" (*p)); |
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return ret; |
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} |
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#endif |
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#ifdef __sparc__ |
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static inline int testandset (int *p) |
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{ |
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int ret; |
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|
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__asm__ __volatile__("ldstub [%1], %0" |
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: "=r" (ret) |
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: "r" (p) |
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: "memory"); |
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return (ret ? 1 : 0); |
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} |
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#endif |
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typedef int spinlock_t; |
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#define SPIN_LOCK_UNLOCKED 0 |
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static inline void spin_lock(spinlock_t *lock) |
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{ |
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while (testandset(lock)); |
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} |
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static inline void spin_unlock(spinlock_t *lock) |
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{ |
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*lock = 0; |
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} |
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static inline int spin_trylock(spinlock_t *lock) |
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{ |
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return !testandset(lock); |
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} |
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extern spinlock_t tb_lock; |
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#endif /* CPU_I386_H */ |
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