| Rich Felker | 2b47d54 | 2016-07-28 19:21:10 +0000 | [diff] [blame] | 1 | #ifndef __ASM_SH_BITOPS_CAS_H |
| 2 | #define __ASM_SH_BITOPS_CAS_H |
| 3 | |
| 4 | static inline unsigned __bo_cas(volatile unsigned *p, unsigned old, unsigned new) |
| 5 | { |
| 6 | __asm__ __volatile__("cas.l %1,%0,@r0" |
| 7 | : "+r"(new) |
| 8 | : "r"(old), "z"(p) |
| 9 | : "t", "memory" ); |
| 10 | return new; |
| 11 | } |
| 12 | |
| 13 | static inline void set_bit(int nr, volatile void *addr) |
| 14 | { |
| 15 | unsigned mask, old; |
| 16 | volatile unsigned *a = addr; |
| 17 | |
| 18 | a += nr >> 5; |
| 19 | mask = 1U << (nr & 0x1f); |
| 20 | |
| 21 | do old = *a; |
| 22 | while (__bo_cas(a, old, old|mask) != old); |
| 23 | } |
| 24 | |
| 25 | static inline void clear_bit(int nr, volatile void *addr) |
| 26 | { |
| 27 | unsigned mask, old; |
| 28 | volatile unsigned *a = addr; |
| 29 | |
| 30 | a += nr >> 5; |
| 31 | mask = 1U << (nr & 0x1f); |
| 32 | |
| 33 | do old = *a; |
| 34 | while (__bo_cas(a, old, old&~mask) != old); |
| 35 | } |
| 36 | |
| 37 | static inline void change_bit(int nr, volatile void *addr) |
| 38 | { |
| 39 | unsigned mask, old; |
| 40 | volatile unsigned *a = addr; |
| 41 | |
| 42 | a += nr >> 5; |
| 43 | mask = 1U << (nr & 0x1f); |
| 44 | |
| 45 | do old = *a; |
| 46 | while (__bo_cas(a, old, old^mask) != old); |
| 47 | } |
| 48 | |
| 49 | static inline int test_and_set_bit(int nr, volatile void *addr) |
| 50 | { |
| 51 | unsigned mask, old; |
| 52 | volatile unsigned *a = addr; |
| 53 | |
| 54 | a += nr >> 5; |
| 55 | mask = 1U << (nr & 0x1f); |
| 56 | |
| 57 | do old = *a; |
| 58 | while (__bo_cas(a, old, old|mask) != old); |
| 59 | |
| 60 | return !!(old & mask); |
| 61 | } |
| 62 | |
| 63 | static inline int test_and_clear_bit(int nr, volatile void *addr) |
| 64 | { |
| 65 | unsigned mask, old; |
| 66 | volatile unsigned *a = addr; |
| 67 | |
| 68 | a += nr >> 5; |
| 69 | mask = 1U << (nr & 0x1f); |
| 70 | |
| 71 | do old = *a; |
| 72 | while (__bo_cas(a, old, old&~mask) != old); |
| 73 | |
| 74 | return !!(old & mask); |
| 75 | } |
| 76 | |
| 77 | static inline int test_and_change_bit(int nr, volatile void *addr) |
| 78 | { |
| 79 | unsigned mask, old; |
| 80 | volatile unsigned *a = addr; |
| 81 | |
| 82 | a += nr >> 5; |
| 83 | mask = 1U << (nr & 0x1f); |
| 84 | |
| 85 | do old = *a; |
| 86 | while (__bo_cas(a, old, old^mask) != old); |
| 87 | |
| 88 | return !!(old & mask); |
| 89 | } |
| 90 | |
| 91 | #include <asm-generic/bitops/non-atomic.h> |
| 92 | |
| 93 | #endif /* __ASM_SH_BITOPS_CAS_H */ |