diff options
Diffstat (limited to 'arch/ppc/atomic.h')
-rw-r--r-- | arch/ppc/atomic.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/ppc/atomic.h b/arch/ppc/atomic.h new file mode 100644 index 00000000..af397599 --- /dev/null +++ b/arch/ppc/atomic.h @@ -0,0 +1,124 @@ +#ifndef _INTERNAL_ATOMIC_H +#define _INTERNAL_ATOMIC_H + +#include <stdint.h> +#include <endian.h> + +static inline int a_ctz_l(unsigned long x) +{ + static const char debruijn32[32] = { + 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13, + 31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14 + }; + return debruijn32[(x&-x)*0x076be629 >> 27]; +} + +static inline int a_ctz_64(uint64_t x) +{ + uint32_t y = x; + if (!y) { + y = x>>32; + return 32 + a_ctz_l(y); + } + return a_ctz_l(y); +} + +static inline int a_cas(volatile int *p, int t, int s) +{ + + __asm__( "1: lwarx 10, 0, %1\n" + " stwcx. %3, 0, %1\n" + " bne- 1b\n" + " mr %0, 10\n" + : "=r"(t) : "r"(p), "r"(t), "r"(s) : "memory" ); + return t; +} + +static inline void *a_cas_p(volatile void *p, void *t, void *s) +{ + return (void *)a_cas(p, (int)t, (int)s); +} + +static inline long a_cas_l(volatile void *p, long t, long s) +{ + return a_cas(p, t, s); +} + + +static inline int a_swap(volatile int *x, int v) +{ + int old; + do old = *x; + while (a_cas(x, old, v) != old); + return old; +} + +static inline int a_fetch_add(volatile int *x, int v) +{ + int old; + do old = *x; + while (a_cas(x, old, old+v) != old); + return old; +} + +static inline void a_inc(volatile int *x) +{ + a_fetch_add(x, 1); +} + +static inline void a_dec(volatile int *x) +{ + a_fetch_add(x, -1); +} + +static inline void a_store(volatile int *p, int x) +{ + *p=x; +} + +static inline void a_spin() +{ +} + +static inline void a_crash() +{ + *(volatile char *)0=0; +} + +static inline void a_and(volatile int *p, int v) +{ + int old; + do old = *p; + while (a_cas(p, old, old&v) != old); +} + +static inline void a_or(volatile int *p, int v) +{ + int old; + do old = *p; + while (a_cas(p, old, old|v) != old); +} + +static inline void a_and_64(volatile uint64_t *p, uint64_t v) +{ +#if __BYTE_ORDER == __LITTLE_ENDIAN + a_and((int *)p, v); + a_and((int *)p+1, v>>32); +#else + a_and((int *)p+1, v); + a_and((int *)p, v>>32); +#endif +} + +static inline void a_or_64(volatile uint64_t *p, uint64_t v) +{ +#if __BYTE_ORDER == __LITTLE_ENDIAN + a_or((int *)p, v); + a_or((int *)p+1, v>>32); +#else + a_or((int *)p+1, v); + a_or((int *)p, v>>32); +#endif +} + +#endif |