projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| e839ca52 DH |
1 | #ifndef __ASM_SH_CMPXCHG_H |
| 2 | #define __ASM_SH_CMPXCHG_H | |
| 3 | ||
| 4 | /* | |
| 5 | * Atomic operations that C can't guarantee us. Useful for | |
| 6 | * resource counting etc.. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/compiler.h> | |
| 10 | #include <linux/types.h> | |
| 11 | ||
| 12 | #if defined(CONFIG_GUSA_RB) | |
| 13 | #include <asm/cmpxchg-grb.h> | |
| 14 | #elif defined(CONFIG_CPU_SH4A) | |
| 15 | #include <asm/cmpxchg-llsc.h> | |
| 2b47d54e RF |
16 | #elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP) |
| 17 | #include <asm/cmpxchg-cas.h> | |
| e839ca52 DH |
18 | #else |
| 19 | #include <asm/cmpxchg-irq.h> | |
| 20 | #endif | |
| 21 | ||
| 22 | extern void __xchg_called_with_bad_pointer(void); | |
| 23 | ||
| 24 | #define __xchg(ptr, x, size) \ | |
| 25 | ({ \ | |
| 26 | unsigned long __xchg__res; \ | |
| 27 | volatile void *__xchg_ptr = (ptr); \ | |
| 28 | switch (size) { \ | |
| 29 | case 4: \ | |
| 30 | __xchg__res = xchg_u32(__xchg_ptr, x); \ | |
| 31 | break; \ | |
| 3226aad8 MT |
32 | case 2: \ |
| 33 | __xchg__res = xchg_u16(__xchg_ptr, x); \ | |
| 34 | break; \ | |
| e839ca52 DH |
35 | case 1: \ |
| 36 | __xchg__res = xchg_u8(__xchg_ptr, x); \ | |
| 37 | break; \ | |
| 38 | default: \ | |
| 39 | __xchg_called_with_bad_pointer(); \ | |
| 40 | __xchg__res = x; \ | |
| 41 | break; \ | |
| 42 | } \ | |
| 43 | \ | |
| 44 | __xchg__res; \ | |
| 45 | }) | |
| 46 | ||
| 47 | #define xchg(ptr,x) \ | |
| 48 | ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr)))) | |
| 49 | ||
| 50 | /* This function doesn't exist, so you'll get a linker error | |
| 51 | * if something tries to do an invalid cmpxchg(). */ | |
| 52 | extern void __cmpxchg_called_with_bad_pointer(void); | |
| 53 | ||
| e839ca52 DH |
54 | static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old, |
| 55 | unsigned long new, int size) | |
| 56 | { | |
| 57 | switch (size) { | |
| 58 | case 4: | |
| 59 | return __cmpxchg_u32(ptr, old, new); | |
| 60 | } | |
| 61 | __cmpxchg_called_with_bad_pointer(); | |
| 62 | return old; | |
| 63 | } | |
| 64 | ||
| 65 | #define cmpxchg(ptr,o,n) \ | |
| 66 | ({ \ | |
| 67 | __typeof__(*(ptr)) _o_ = (o); \ | |
| 68 | __typeof__(*(ptr)) _n_ = (n); \ | |
| 69 | (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ | |
| 70 | (unsigned long)_n_, sizeof(*(ptr))); \ | |
| 71 | }) | |
| 72 | ||
| 73 | #endif /* __ASM_SH_CMPXCHG_H */ |