diff options
Diffstat (limited to 'include/asm-powerpc/system.h')
| -rw-r--r-- | include/asm-powerpc/system.h | 130 |
1 files changed, 128 insertions, 2 deletions
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h index d3e0906ff2b..09621f611db 100644 --- a/include/asm-powerpc/system.h +++ b/include/asm-powerpc/system.h @@ -7,7 +7,6 @@ #include <linux/kernel.h> #include <asm/hw_irq.h> -#include <asm/atomic.h> /* * Memory barrier. @@ -227,6 +226,29 @@ __xchg_u32(volatile void *p, unsigned long val) return prev; } +/* + * Atomic exchange + * + * Changes the memory location '*ptr' to be val and returns + * the previous value stored there. + */ +static __inline__ unsigned long +__xchg_u32_local(volatile void *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: lwarx %0,0,%2 \n" + PPC405_ERR77(0,%2) +" stwcx. %3,0,%2 \n\ + bne- 1b" + : "=&r" (prev), "+m" (*(volatile unsigned int *)p) + : "r" (p), "r" (val) + : "cc", "memory"); + + return prev; +} + #ifdef CONFIG_PPC64 static __inline__ unsigned long __xchg_u64(volatile void *p, unsigned long val) @@ -246,6 +268,23 @@ __xchg_u64(volatile void *p, unsigned long val) return prev; } + +static __inline__ unsigned long +__xchg_u64_local(volatile void *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: ldarx %0,0,%2 \n" + PPC405_ERR77(0,%2) +" stdcx. %3,0,%2 \n\ + bne- 1b" + : "=&r" (prev), "+m" (*(volatile unsigned long *)p) + : "r" (p), "r" (val) + : "cc", "memory"); + + return prev; +} #endif /* @@ -269,13 +308,32 @@ __xchg(volatile void *ptr, unsigned long x, unsigned int size) return x; } +static __inline__ unsigned long +__xchg_local(volatile void *ptr, unsigned long x, unsigned int size) +{ + switch (size) { + case 4: + return __xchg_u32_local(ptr, x); +#ifdef CONFIG_PPC64 + case 8: + return __xchg_u64_local(ptr, x); +#endif + } + __xchg_called_with_bad_pointer(); + return x; +} #define xchg(ptr,x) \ ({ \ __typeof__(*(ptr)) _x_ = (x); \ (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \ }) -#define tas(ptr) (xchg((ptr),1)) +#define xchg_local(ptr,x) \ + ({ \ + __typeof__(*(ptr)) _x_ = (x); \ + (__typeof__(*(ptr))) __xchg_local((ptr), \ + (unsigned long)_x_, sizeof(*(ptr))); \ + }) /* * Compare and exchange - if *p == old, set it to new, @@ -306,6 +364,28 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new) return prev; } +static __inline__ unsigned long +__cmpxchg_u32_local(volatile unsigned int *p, unsigned long old, + unsigned long new) +{ + unsigned int prev; + + __asm__ __volatile__ ( +"1: lwarx %0,0,%2 # __cmpxchg_u32\n\ + cmpw 0,%0,%3\n\ + bne- 2f\n" + PPC405_ERR77(0,%2) +" stwcx. %4,0,%2\n\ + bne- 1b" + "\n\ +2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + #ifdef CONFIG_PPC64 static __inline__ unsigned long __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new) @@ -328,6 +408,27 @@ __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new) return prev; } + +static __inline__ unsigned long +__cmpxchg_u64_local(volatile unsigned long *p, unsigned long old, + unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: ldarx %0,0,%2 # __cmpxchg_u64\n\ + cmpd 0,%0,%3\n\ + bne- 2f\n\ + stdcx. %4,0,%2\n\ + bne- 1b" + "\n\ +2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} #endif /* This function doesn't exist, so you'll get a linker error @@ -350,6 +451,22 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, return old; } +static __inline__ unsigned long +__cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new, + unsigned int size) +{ + switch (size) { + case 4: + return __cmpxchg_u32_local(ptr, old, new); +#ifdef CONFIG_PPC64 + case 8: + return __cmpxchg_u64_local(ptr, old, new); +#endif + } + __cmpxchg_called_with_bad_pointer(); + return old; +} + #define cmpxchg(ptr,o,n) \ ({ \ __typeof__(*(ptr)) _o_ = (o); \ @@ -358,6 +475,15 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, (unsigned long)_n_, sizeof(*(ptr))); \ }) + +#define cmpxchg_local(ptr,o,n) \ + ({ \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \ + (unsigned long)_n_, sizeof(*(ptr))); \ + }) + #ifdef CONFIG_PPC64 /* * We handle most unaligned accesses in hardware. On the other hand |