mirror of https://gitee.com/openkylin/linux.git
94 lines
1.7 KiB
C
94 lines
1.7 KiB
C
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#ifndef __ASM_SH_BITOPS_CAS_H
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#define __ASM_SH_BITOPS_CAS_H
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static inline unsigned __bo_cas(volatile unsigned *p, unsigned old, unsigned new)
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{
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__asm__ __volatile__("cas.l %1,%0,@r0"
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: "+r"(new)
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: "r"(old), "z"(p)
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: "t", "memory" );
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return new;
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}
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static inline void set_bit(int nr, volatile void *addr)
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{
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unsigned mask, old;
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volatile unsigned *a = addr;
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a += nr >> 5;
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mask = 1U << (nr & 0x1f);
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do old = *a;
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while (__bo_cas(a, old, old|mask) != old);
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}
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static inline void clear_bit(int nr, volatile void *addr)
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{
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unsigned mask, old;
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volatile unsigned *a = addr;
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a += nr >> 5;
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mask = 1U << (nr & 0x1f);
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do old = *a;
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while (__bo_cas(a, old, old&~mask) != old);
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}
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static inline void change_bit(int nr, volatile void *addr)
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{
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unsigned mask, old;
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volatile unsigned *a = addr;
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a += nr >> 5;
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mask = 1U << (nr & 0x1f);
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do old = *a;
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while (__bo_cas(a, old, old^mask) != old);
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}
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static inline int test_and_set_bit(int nr, volatile void *addr)
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{
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unsigned mask, old;
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volatile unsigned *a = addr;
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a += nr >> 5;
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mask = 1U << (nr & 0x1f);
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do old = *a;
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while (__bo_cas(a, old, old|mask) != old);
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return !!(old & mask);
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}
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static inline int test_and_clear_bit(int nr, volatile void *addr)
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{
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unsigned mask, old;
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volatile unsigned *a = addr;
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a += nr >> 5;
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mask = 1U << (nr & 0x1f);
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do old = *a;
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while (__bo_cas(a, old, old&~mask) != old);
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return !!(old & mask);
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}
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static inline int test_and_change_bit(int nr, volatile void *addr)
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{
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unsigned mask, old;
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volatile unsigned *a = addr;
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a += nr >> 5;
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mask = 1U << (nr & 0x1f);
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do old = *a;
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while (__bo_cas(a, old, old^mask) != old);
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return !!(old & mask);
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}
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#include <asm-generic/bitops/non-atomic.h>
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#endif /* __ASM_SH_BITOPS_CAS_H */
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