| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __ASM_SH_BITOPS_CAS_H |
| 3 | #define __ASM_SH_BITOPS_CAS_H |
| 4 | |
| 5 | static inline unsigned __bo_cas(volatile unsigned *p, unsigned old, unsigned new) |
| 6 | { |
| 7 | __asm__ __volatile__("cas.l %1,%0,@r0" |
| 8 | : "+r"(new) |
| 9 | : "r"(old), "z"(p) |
| 10 | : "t", "memory" ); |
| 11 | return new; |
| 12 | } |
| 13 | |
| 14 | static inline void set_bit(int nr, volatile void *addr) |
| 15 | { |
| 16 | unsigned mask, old; |
| 17 | volatile unsigned *a = addr; |
| 18 | |
| 19 | a += nr >> 5; |
| 20 | mask = 1U << (nr & 0x1f); |
| 21 | |
| 22 | do old = *a; |
| 23 | while (__bo_cas(a, old, old|mask) != old); |
| 24 | } |
| 25 | |
| 26 | static inline void clear_bit(int nr, volatile void *addr) |
| 27 | { |
| 28 | unsigned mask, old; |
| 29 | volatile unsigned *a = addr; |
| 30 | |
| 31 | a += nr >> 5; |
| 32 | mask = 1U << (nr & 0x1f); |
| 33 | |
| 34 | do old = *a; |
| 35 | while (__bo_cas(a, old, old&~mask) != old); |
| 36 | } |
| 37 | |
| 38 | static inline void change_bit(int nr, volatile void *addr) |
| 39 | { |
| 40 | unsigned mask, old; |
| 41 | volatile unsigned *a = addr; |
| 42 | |
| 43 | a += nr >> 5; |
| 44 | mask = 1U << (nr & 0x1f); |
| 45 | |
| 46 | do old = *a; |
| 47 | while (__bo_cas(a, old, old^mask) != old); |
| 48 | } |
| 49 | |
| 50 | static inline int test_and_set_bit(int nr, volatile void *addr) |
| 51 | { |
| 52 | unsigned mask, old; |
| 53 | volatile unsigned *a = addr; |
| 54 | |
| 55 | a += nr >> 5; |
| 56 | mask = 1U << (nr & 0x1f); |
| 57 | |
| 58 | do old = *a; |
| 59 | while (__bo_cas(a, old, old|mask) != old); |
| 60 | |
| 61 | return !!(old & mask); |
| 62 | } |
| 63 | |
| 64 | static inline int test_and_clear_bit(int nr, volatile void *addr) |
| 65 | { |
| 66 | unsigned mask, old; |
| 67 | volatile unsigned *a = addr; |
| 68 | |
| 69 | a += nr >> 5; |
| 70 | mask = 1U << (nr & 0x1f); |
| 71 | |
| 72 | do old = *a; |
| 73 | while (__bo_cas(a, old, old&~mask) != old); |
| 74 | |
| 75 | return !!(old & mask); |
| 76 | } |
| 77 | |
| 78 | static inline int test_and_change_bit(int nr, volatile void *addr) |
| 79 | { |
| 80 | unsigned mask, old; |
| 81 | volatile unsigned *a = addr; |
| 82 | |
| 83 | a += nr >> 5; |
| 84 | mask = 1U << (nr & 0x1f); |
| 85 | |
| 86 | do old = *a; |
| 87 | while (__bo_cas(a, old, old^mask) != old); |
| 88 | |
| 89 | return !!(old & mask); |
| 90 | } |
| 91 | |
| 92 | #include <asm-generic/bitops/non-atomic.h> |
| 93 | |
| 94 | #endif /* __ASM_SH_BITOPS_CAS_H */ |