/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_CSKY_CMPXCHG_H
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#define __ASM_CSKY_CMPXCHG_H
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#ifdef CONFIG_CPU_HAS_LDSTEX
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#include <asm/barrier.h>
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extern void __bad_xchg(void);
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#define __xchg(new, ptr, size) \
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({ \
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__typeof__(ptr) __ptr = (ptr); \
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__typeof__(new) __new = (new); \
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__typeof__(*(ptr)) __ret; \
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unsigned long tmp; \
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switch (size) { \
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case 4: \
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smp_mb(); \
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asm volatile ( \
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"1: ldex.w %0, (%3) \n" \
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" mov %1, %2 \n" \
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" stex.w %1, (%3) \n" \
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" bez %1, 1b \n" \
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: "=&r" (__ret), "=&r" (tmp) \
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: "r" (__new), "r"(__ptr) \
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:); \
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smp_mb(); \
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break; \
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default: \
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__bad_xchg(); \
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} \
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__ret; \
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})
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#define xchg(ptr, x) (__xchg((x), (ptr), sizeof(*(ptr))))
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#define __cmpxchg(ptr, old, new, size) \
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({ \
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__typeof__(ptr) __ptr = (ptr); \
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__typeof__(new) __new = (new); \
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__typeof__(new) __tmp; \
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__typeof__(old) __old = (old); \
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__typeof__(*(ptr)) __ret; \
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switch (size) { \
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case 4: \
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smp_mb(); \
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asm volatile ( \
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"1: ldex.w %0, (%3) \n" \
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" cmpne %0, %4 \n" \
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" bt 2f \n" \
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" mov %1, %2 \n" \
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" stex.w %1, (%3) \n" \
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" bez %1, 1b \n" \
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"2: \n" \
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: "=&r" (__ret), "=&r" (__tmp) \
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: "r" (__new), "r"(__ptr), "r"(__old) \
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:); \
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smp_mb(); \
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break; \
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default: \
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__bad_xchg(); \
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} \
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__ret; \
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})
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#define cmpxchg(ptr, o, n) \
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(__cmpxchg((ptr), (o), (n), sizeof(*(ptr))))
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#else
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#include <asm-generic/cmpxchg.h>
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#endif
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#endif /* __ASM_CSKY_CMPXCHG_H */
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