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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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