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