/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ARCH_H8300_CMPXCHG__ #define __ARCH_H8300_CMPXCHG__ #include <linux/irqflags.h> #define xchg(ptr, x) \ ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \ sizeof(*(ptr)))) struct __xchg_dummy { unsigned long a[100]; }; #define __xg(x) ((volatile struct __xchg_dummy *)(x)) static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size) { unsigned long tmp, flags; local_irq_save(flags); switch (size) { case 1: __asm__ __volatile__ ("mov.b %2,%0\n\t" "mov.b %1,%2" : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); break; case 2: __asm__ __volatile__ ("mov.w %2,%0\n\t" "mov.w %1,%2" : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); break; case 4: __asm__ __volatile__ ("mov.l %2,%0\n\t" "mov.l %1,%2" : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); break; default: tmp = 0; } local_irq_restore(flags); return tmp; } #include <asm-generic/cmpxchg-local.h> /* * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make * them available. */ #define cmpxchg_local(ptr, o, n) \ ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \ (unsigned long)(o), \ (unsigned long)(n), \ sizeof(*(ptr)))) #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #ifndef CONFIG_SMP #include <asm-generic/cmpxchg.h> #endif #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) #endif /* __ARCH_H8300_CMPXCHG__ */