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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_SH_CMPXCHG_H #define __ASM_SH_CMPXCHG_H /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. */ #include <linux/compiler.h> #include <linux/types.h> #if defined(CONFIG_GUSA_RB) #include <asm/cmpxchg-grb.h> #elif defined(CONFIG_CPU_SH4A) #include <asm/cmpxchg-llsc.h> #elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP) #include <asm/cmpxchg-cas.h> #else #include <asm/cmpxchg-irq.h> #endif extern void __xchg_called_with_bad_pointer(void); #define __xchg(ptr, x, size) \ ({ \ unsigned long __xchg__res; \ volatile void *__xchg_ptr = (ptr); \ switch (size) { \ case 4: \ __xchg__res = xchg_u32(__xchg_ptr, x); \ break; \ case 2: \ __xchg__res = xchg_u16(__xchg_ptr, x); \ break; \ case 1: \ __xchg__res = xchg_u8(__xchg_ptr, x); \ break; \ default: \ __xchg_called_with_bad_pointer(); \ __xchg__res = x; \ break; \ } \ \ __xchg__res; \ }) #define xchg(ptr,x) \ ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr)))) /* This function doesn't exist, so you'll get a linker error * if something tries to do an invalid cmpxchg(). */ extern void __cmpxchg_called_with_bad_pointer(void); static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old, unsigned long new, int size) { switch (size) { case 4: return __cmpxchg_u32(ptr, old, new); } __cmpxchg_called_with_bad_pointer(); return old; } #define cmpxchg(ptr,o,n) \ ({ \ __typeof__(*(ptr)) _o_ = (o); \ __typeof__(*(ptr)) _n_ = (n); \ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ (unsigned long)_n_, sizeof(*(ptr))); \ }) #endif /* __ASM_SH_CMPXCHG_H */
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