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88 lines
2.1 KiB
88 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_SH_ATOMIC_LLSC_H |
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#define __ASM_SH_ATOMIC_LLSC_H |
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/* |
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* SH-4A note: |
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* |
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* We basically get atomic_xxx_return() for free compared with |
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* atomic_xxx(). movli.l/movco.l require r0 due to the instruction |
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* encoding, so the retval is automatically set without having to |
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* do any special work. |
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*/ |
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/* |
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* To get proper branch prediction for the main line, we must branch |
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* forward to code at the end of this object's .text section, then |
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* branch back to restart the operation. |
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*/ |
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#define ATOMIC_OP(op) \ |
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static inline void arch_atomic_##op(int i, atomic_t *v) \ |
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{ \ |
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unsigned long tmp; \ |
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\ |
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__asm__ __volatile__ ( \ |
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"1: movli.l @%2, %0 ! atomic_" #op "\n" \ |
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" " #op " %1, %0 \n" \ |
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" movco.l %0, @%2 \n" \ |
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" bf 1b \n" \ |
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: "=&z" (tmp) \ |
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: "r" (i), "r" (&v->counter) \ |
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: "t"); \ |
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} |
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#define ATOMIC_OP_RETURN(op) \ |
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static inline int arch_atomic_##op##_return(int i, atomic_t *v) \ |
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{ \ |
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unsigned long temp; \ |
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\ |
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__asm__ __volatile__ ( \ |
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"1: movli.l @%2, %0 ! atomic_" #op "_return \n" \ |
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" " #op " %1, %0 \n" \ |
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" movco.l %0, @%2 \n" \ |
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" bf 1b \n" \ |
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" synco \n" \ |
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: "=&z" (temp) \ |
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: "r" (i), "r" (&v->counter) \ |
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: "t"); \ |
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\ |
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return temp; \ |
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} |
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#define ATOMIC_FETCH_OP(op) \ |
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static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \ |
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{ \ |
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unsigned long res, temp; \ |
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\ |
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__asm__ __volatile__ ( \ |
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"1: movli.l @%3, %0 ! atomic_fetch_" #op " \n" \ |
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" mov %0, %1 \n" \ |
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" " #op " %2, %0 \n" \ |
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" movco.l %0, @%3 \n" \ |
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" bf 1b \n" \ |
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" synco \n" \ |
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: "=&z" (temp), "=&r" (res) \ |
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: "r" (i), "r" (&v->counter) \ |
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: "t"); \ |
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\ |
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return res; \ |
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} |
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#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op) |
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ATOMIC_OPS(add) |
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ATOMIC_OPS(sub) |
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#undef ATOMIC_OPS |
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#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) |
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ATOMIC_OPS(and) |
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ATOMIC_OPS(or) |
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ATOMIC_OPS(xor) |
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#undef ATOMIC_OPS |
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#undef ATOMIC_FETCH_OP |
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#undef ATOMIC_OP_RETURN |
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#undef ATOMIC_OP |
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#endif /* __ASM_SH_ATOMIC_LLSC_H */
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