projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 6006c0d8 JH |
2 | #ifndef __ASM_METAG_CMPXCHG_H |
| 3 | #define __ASM_METAG_CMPXCHG_H | |
| 4 | ||
| 5 | #include <asm/barrier.h> | |
| 6 | ||
| 7 | #if defined(CONFIG_METAG_ATOMICITY_IRQSOFF) | |
| 8 | #include <asm/cmpxchg_irq.h> | |
| 9 | #elif defined(CONFIG_METAG_ATOMICITY_LOCK1) | |
| 10 | #include <asm/cmpxchg_lock1.h> | |
| 11 | #elif defined(CONFIG_METAG_ATOMICITY_LNKGET) | |
| 12 | #include <asm/cmpxchg_lnkget.h> | |
| 13 | #endif | |
| 14 | ||
| 15 | extern void __xchg_called_with_bad_pointer(void); | |
| 16 | ||
| 17 | #define __xchg(ptr, x, size) \ | |
| 18 | ({ \ | |
| 19 | unsigned long __xchg__res; \ | |
| 20 | volatile void *__xchg_ptr = (ptr); \ | |
| 21 | switch (size) { \ | |
| 22 | case 4: \ | |
| 23 | __xchg__res = xchg_u32(__xchg_ptr, x); \ | |
| 24 | break; \ | |
| 25 | case 1: \ | |
| 26 | __xchg__res = xchg_u8(__xchg_ptr, x); \ | |
| 27 | break; \ | |
| 28 | default: \ | |
| 29 | __xchg_called_with_bad_pointer(); \ | |
| 30 | __xchg__res = x; \ | |
| 31 | break; \ | |
| 32 | } \ | |
| 33 | \ | |
| 34 | __xchg__res; \ | |
| 35 | }) | |
| 36 | ||
| 37 | #define xchg(ptr, x) \ | |
| 38 | ((__typeof__(*(ptr)))__xchg((ptr), (unsigned long)(x), sizeof(*(ptr)))) | |
| 39 | ||
| 40 | /* This function doesn't exist, so you'll get a linker error | |
| 41 | * if something tries to do an invalid cmpxchg(). */ | |
| 42 | extern void __cmpxchg_called_with_bad_pointer(void); | |
| 43 | ||
| 44 | static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, | |
| 45 | unsigned long new, int size) | |
| 46 | { | |
| 47 | switch (size) { | |
| 48 | case 4: | |
| 49 | return __cmpxchg_u32(ptr, old, new); | |
| 50 | } | |
| 51 | __cmpxchg_called_with_bad_pointer(); | |
| 52 | return old; | |
| 53 | } | |
| 54 | ||
| 6006c0d8 JH |
55 | #define cmpxchg(ptr, o, n) \ |
| 56 | ({ \ | |
| 57 | __typeof__(*(ptr)) _o_ = (o); \ | |
| 58 | __typeof__(*(ptr)) _n_ = (n); \ | |
| 59 | (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ | |
| 60 | (unsigned long)_n_, \ | |
| 61 | sizeof(*(ptr))); \ | |
| 62 | }) | |
| 63 | ||
| 64 | #endif /* __ASM_METAG_CMPXCHG_H */ |