projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b1a154db DH |
1 | #ifndef __ASM_CRIS_CMPXCHG__ |
| 2 | #define __ASM_CRIS_CMPXCHG__ | |
| 3 | ||
| 4 | #include <linux/irqflags.h> | |
| 5 | ||
| 6 | static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) | |
| 7 | { | |
| 8 | /* since Etrax doesn't have any atomic xchg instructions, we need to disable | |
| 9 | irq's (if enabled) and do it with move.d's */ | |
| 10 | unsigned long flags,temp; | |
| 11 | local_irq_save(flags); /* save flags, including irq enable bit and shut off irqs */ | |
| 12 | switch (size) { | |
| 13 | case 1: | |
| 14 | *((unsigned char *)&temp) = x; | |
| 15 | x = *(unsigned char *)ptr; | |
| 16 | *(unsigned char *)ptr = *((unsigned char *)&temp); | |
| 17 | break; | |
| 18 | case 2: | |
| 19 | *((unsigned short *)&temp) = x; | |
| 20 | x = *(unsigned short *)ptr; | |
| 21 | *(unsigned short *)ptr = *((unsigned short *)&temp); | |
| 22 | break; | |
| 23 | case 4: | |
| 24 | temp = x; | |
| 25 | x = *(unsigned long *)ptr; | |
| 26 | *(unsigned long *)ptr = temp; | |
| 27 | break; | |
| 28 | } | |
| 29 | local_irq_restore(flags); /* restore irq enable bit */ | |
| 30 | return x; | |
| 31 | } | |
| 32 | ||
| 33 | #define xchg(ptr,x) \ | |
| 34 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) | |
| 35 | ||
| 36 | #define tas(ptr) (xchg((ptr),1)) | |
| 37 | ||
| 38 | #include <asm-generic/cmpxchg-local.h> | |
| 39 | ||
| 40 | /* | |
| 41 | * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make | |
| 42 | * them available. | |
| 43 | */ | |
| 44 | #define cmpxchg_local(ptr, o, n) \ | |
| 45 | ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\ | |
| 46 | (unsigned long)(n), sizeof(*(ptr)))) | |
| 47 | #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) | |
| 48 | ||
| 49 | #ifndef CONFIG_SMP | |
| 50 | #include <asm-generic/cmpxchg.h> | |
| 51 | #endif | |
| 52 | ||
| 53 | #endif /* __ASM_CRIS_CMPXCHG__ */ |