projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 6006c0d8 JH |
1 | #ifndef __ASM_METAG_CMPXCHG_H |
| 2 | #define __ASM_METAG_CMPXCHG_H | |
| 3 | ||
| 4 | #include <asm/barrier.h> | |
| 5 | ||
| 6 | #if defined(CONFIG_METAG_ATOMICITY_IRQSOFF) | |
| 7 | #include <asm/cmpxchg_irq.h> | |
| 8 | #elif defined(CONFIG_METAG_ATOMICITY_LOCK1) | |
| 9 | #include <asm/cmpxchg_lock1.h> | |
| 10 | #elif defined(CONFIG_METAG_ATOMICITY_LNKGET) | |
| 11 | #include <asm/cmpxchg_lnkget.h> | |
| 12 | #endif | |
| 13 | ||
| 14 | extern void __xchg_called_with_bad_pointer(void); | |
| 15 | ||
| 16 | #define __xchg(ptr, x, size) \ | |
| 17 | ({ \ | |
| 18 | unsigned long __xchg__res; \ | |
| 19 | volatile void *__xchg_ptr = (ptr); \ | |
| 20 | switch (size) { \ | |
| 21 | case 4: \ | |
| 22 | __xchg__res = xchg_u32(__xchg_ptr, x); \ | |
| 23 | break; \ | |
| 24 | case 1: \ | |
| 25 | __xchg__res = xchg_u8(__xchg_ptr, x); \ | |
| 26 | break; \ | |
| 27 | default: \ | |
| 28 | __xchg_called_with_bad_pointer(); \ | |
| 29 | __xchg__res = x; \ | |
| 30 | break; \ | |
| 31 | } \ | |
| 32 | \ | |
| 33 | __xchg__res; \ | |
| 34 | }) | |
| 35 | ||
| 36 | #define xchg(ptr, x) \ | |
| 37 | ((__typeof__(*(ptr)))__xchg((ptr), (unsigned long)(x), sizeof(*(ptr)))) | |
| 38 | ||
| 39 | /* This function doesn't exist, so you'll get a linker error | |
| 40 | * if something tries to do an invalid cmpxchg(). */ | |
| 41 | extern void __cmpxchg_called_with_bad_pointer(void); | |
| 42 | ||
| 43 | static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, | |
| 44 | unsigned long new, int size) | |
| 45 | { | |
| 46 | switch (size) { | |
| 47 | case 4: | |
| 48 | return __cmpxchg_u32(ptr, old, new); | |
| 49 | } | |
| 50 | __cmpxchg_called_with_bad_pointer(); | |
| 51 | return old; | |
| 52 | } | |
| 53 | ||
| 6006c0d8 JH |
54 | #define cmpxchg(ptr, o, n) \ |
| 55 | ({ \ | |
| 56 | __typeof__(*(ptr)) _o_ = (o); \ | |
| 57 | __typeof__(*(ptr)) _n_ = (n); \ | |
| 58 | (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ | |
| 59 | (unsigned long)_n_, \ | |
| 60 | sizeof(*(ptr))); \ | |
| 61 | }) | |
| 62 | ||
| 63 | #endif /* __ASM_METAG_CMPXCHG_H */ |