#ifndef __ASM_METAG_CMPXCHG_H #define __ASM_METAG_CMPXCHG_H #include <asm/barrier.h> #if defined([31mCONFIG_METAG_ATOMICITY_IRQSOFF[0m) #include <asm/cmpxchg_irq.h> #elif defined([31mCONFIG_METAG_ATOMICITY_LOCK1[0m) #include <asm/cmpxchg_lock1.h> #elif defined([31mCONFIG_METAG_ATOMICITY_LNKGET[0m) #include <asm/cmpxchg_lnkget.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 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_METAG_CMPXCHG_H */ |