| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __ASM_SH_ATOMIC_IRQ_H |
| 3 | #define __ASM_SH_ATOMIC_IRQ_H |
| 4 | |
| 5 | #include <linux/irqflags.h> |
| 6 | |
| 7 | /* |
| 8 | * To get proper branch prediction for the main line, we must branch |
| 9 | * forward to code at the end of this object's .text section, then |
| 10 | * branch back to restart the operation. |
| 11 | */ |
| 12 | |
| 13 | #define ATOMIC_OP(op, c_op) \ |
| 14 | static inline void atomic_##op(int i, atomic_t *v) \ |
| 15 | { \ |
| 16 | unsigned long flags; \ |
| 17 | \ |
| 18 | raw_local_irq_save(flags); \ |
| 19 | v->counter c_op i; \ |
| 20 | raw_local_irq_restore(flags); \ |
| 21 | } |
| 22 | |
| 23 | #define ATOMIC_OP_RETURN(op, c_op) \ |
| 24 | static inline int atomic_##op##_return(int i, atomic_t *v) \ |
| 25 | { \ |
| 26 | unsigned long temp, flags; \ |
| 27 | \ |
| 28 | raw_local_irq_save(flags); \ |
| 29 | temp = v->counter; \ |
| 30 | temp c_op i; \ |
| 31 | v->counter = temp; \ |
| 32 | raw_local_irq_restore(flags); \ |
| 33 | \ |
| 34 | return temp; \ |
| 35 | } |
| 36 | |
| 37 | #define ATOMIC_FETCH_OP(op, c_op) \ |
| 38 | static inline int atomic_fetch_##op(int i, atomic_t *v) \ |
| 39 | { \ |
| 40 | unsigned long temp, flags; \ |
| 41 | \ |
| 42 | raw_local_irq_save(flags); \ |
| 43 | temp = v->counter; \ |
| 44 | v->counter c_op i; \ |
| 45 | raw_local_irq_restore(flags); \ |
| 46 | \ |
| 47 | return temp; \ |
| 48 | } |
| 49 | |
| 50 | #define ATOMIC_OPS(op, c_op) \ |
| 51 | ATOMIC_OP(op, c_op) \ |
| 52 | ATOMIC_OP_RETURN(op, c_op) \ |
| 53 | ATOMIC_FETCH_OP(op, c_op) |
| 54 | |
| 55 | ATOMIC_OPS(add, +=) |
| 56 | ATOMIC_OPS(sub, -=) |
| 57 | |
| 58 | #undef ATOMIC_OPS |
| 59 | #define ATOMIC_OPS(op, c_op) \ |
| 60 | ATOMIC_OP(op, c_op) \ |
| 61 | ATOMIC_FETCH_OP(op, c_op) |
| 62 | |
| 63 | ATOMIC_OPS(and, &=) |
| 64 | ATOMIC_OPS(or, |=) |
| 65 | ATOMIC_OPS(xor, ^=) |
| 66 | |
| 67 | #undef ATOMIC_OPS |
| 68 | #undef ATOMIC_FETCH_OP |
| 69 | #undef ATOMIC_OP_RETURN |
| 70 | #undef ATOMIC_OP |
| 71 | |
| 72 | #endif /* __ASM_SH_ATOMIC_IRQ_H */ |