1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ARCH_M68K_CMPXCHG__
3 #define __ARCH_M68K_CMPXCHG__
5 #include <linux/irqflags.h>
7 #define __xg(type, x) ((volatile type *)(x))
9 extern unsigned long __invalid_xchg_size(unsigned long, volatile void *, int);
11 #ifndef CONFIG_RMW_INSNS
12 static inline unsigned long __arch_xchg(unsigned long x, volatile void * ptr, int size)
14 unsigned long flags, tmp;
16 local_irq_save(flags);
35 tmp = __invalid_xchg_size(x, ptr, size);
39 local_irq_restore(flags);
43 static inline unsigned long __arch_xchg(unsigned long x, volatile void * ptr, int size)
52 : "=&d" (x) : "d" (x), "m" (*__xg(u8, ptr)) : "memory");
60 : "=&d" (x) : "d" (x), "m" (*__xg(u16, ptr)) : "memory");
68 : "=&d" (x) : "d" (x), "m" (*__xg(u32, ptr)) : "memory");
71 x = __invalid_xchg_size(x, ptr, size);
78 #define arch_xchg(ptr,x) ({(__typeof__(*(ptr)))__arch_xchg((unsigned long)(x),(ptr),sizeof(*(ptr)));})
80 #include <asm-generic/cmpxchg-local.h>
82 #define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n))
84 extern unsigned long __invalid_cmpxchg_size(volatile void *,
85 unsigned long, unsigned long, int);
88 * Atomic compare and exchange. Compare OLD with MEM, if identical,
89 * store NEW in MEM. Return the initial value in MEM. Success is
90 * indicated by comparing RETURN with OLD.
92 #ifdef CONFIG_RMW_INSNS
94 static inline unsigned long __cmpxchg(volatile void *p, unsigned long old,
95 unsigned long new, int size)
99 __asm__ __volatile__ ("casb %0,%2,%1"
100 : "=d" (old), "=m" (*(char *)p)
101 : "d" (new), "0" (old), "m" (*(char *)p));
104 __asm__ __volatile__ ("casw %0,%2,%1"
105 : "=d" (old), "=m" (*(short *)p)
106 : "d" (new), "0" (old), "m" (*(short *)p));
109 __asm__ __volatile__ ("casl %0,%2,%1"
110 : "=d" (old), "=m" (*(int *)p)
111 : "d" (new), "0" (old), "m" (*(int *)p));
114 old = __invalid_cmpxchg_size(p, old, new, size);
120 #define arch_cmpxchg(ptr, o, n) \
121 ({(__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
122 (unsigned long)(n), sizeof(*(ptr)));})
123 #define arch_cmpxchg_local(ptr, o, n) \
124 ({(__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
125 (unsigned long)(n), sizeof(*(ptr)));})
127 #define arch_cmpxchg64(ptr, o, n) arch_cmpxchg64_local((ptr), (o), (n))
131 #include <asm-generic/cmpxchg.h>
135 #endif /* __ARCH_M68K_CMPXCHG__ */