diff options
Diffstat (limited to 'include/asm-m32r')
| -rw-r--r-- | include/asm-m32r/system.h | 111 |
1 files changed, 101 insertions, 10 deletions
diff --git a/include/asm-m32r/system.h b/include/asm-m32r/system.h index 2365de5c295..7e7eb3703d8 100644 --- a/include/asm-m32r/system.h +++ b/include/asm-m32r/system.h @@ -121,8 +121,11 @@ static inline void local_irq_disable(void) #define nop() __asm__ __volatile__ ("nop" : : ) -#define xchg(ptr,x) \ - ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) +#define xchg(ptr, x) \ + ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) +#define xchg_local(ptr, x) \ + ((__typeof__(*(ptr)))__xchg_local((unsigned long)(x), (ptr), \ + sizeof(*(ptr)))) #ifdef CONFIG_SMP extern void __xchg_called_with_bad_pointer(void); @@ -146,7 +149,7 @@ extern void __xchg_called_with_bad_pointer(void); #endif /* CONFIG_CHIP_M32700_TS1 */ static __always_inline unsigned long -__xchg(unsigned long x, volatile void * ptr, int size) +__xchg(unsigned long x, volatile void *ptr, int size) { unsigned long flags; unsigned long tmp = 0; @@ -196,6 +199,42 @@ __xchg(unsigned long x, volatile void * ptr, int size) return (tmp); } +static __always_inline unsigned long +__xchg_local(unsigned long x, volatile void *ptr, int size) +{ + unsigned long flags; + unsigned long tmp = 0; + + local_irq_save(flags); + + switch (size) { + case 1: + __asm__ __volatile__ ( + "ldb %0, @%2 \n\t" + "stb %1, @%2 \n\t" + : "=&r" (tmp) : "r" (x), "r" (ptr) : "memory"); + break; + case 2: + __asm__ __volatile__ ( + "ldh %0, @%2 \n\t" + "sth %1, @%2 \n\t" + : "=&r" (tmp) : "r" (x), "r" (ptr) : "memory"); + break; + case 4: + __asm__ __volatile__ ( + "ld %0, @%2 \n\t" + "st %1, @%2 \n\t" + : "=&r" (tmp) : "r" (x), "r" (ptr) : "memory"); + break; + default: + __xchg_called_with_bad_pointer(); + } + + local_irq_restore(flags); + + return (tmp); +} + #define __HAVE_ARCH_CMPXCHG 1 static inline unsigned long @@ -228,6 +267,37 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new) return retval; } +static inline unsigned long +__cmpxchg_local_u32(volatile unsigned int *p, unsigned int old, + unsigned int new) +{ + unsigned long flags; + unsigned int retval; + + local_irq_save(flags); + __asm__ __volatile__ ( + DCACHE_CLEAR("%0", "r4", "%1") + "ld %0, @%1; \n" + " bne %0, %2, 1f; \n" + "st %3, @%1; \n" + " bra 2f; \n" + " .fillinsn \n" + "1:" + "st %0, @%1; \n" + " .fillinsn \n" + "2:" + : "=&r" (retval) + : "r" (p), "r" (old), "r" (new) + : "cbit", "memory" +#ifdef CONFIG_CHIP_M32700_TS1 + , "r4" +#endif /* CONFIG_CHIP_M32700_TS1 */ + ); + local_irq_restore(flags); + + return retval; +} + /* This function doesn't exist, so you'll get a linker error if something tries to do an invalid cmpxchg(). */ extern void __cmpxchg_called_with_bad_pointer(void); @@ -247,13 +317,34 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) return old; } -#define cmpxchg(ptr,o,n) \ - ({ \ - __typeof__(*(ptr)) _o_ = (o); \ - __typeof__(*(ptr)) _n_ = (n); \ - (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ - (unsigned long)_n_, sizeof(*(ptr))); \ - }) +#define cmpxchg(ptr, o, n) \ + ((__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)(o), \ + (unsigned long)(n), sizeof(*(ptr)))) + +#include <asm-generic/cmpxchg-local.h> + +static inline unsigned long __cmpxchg_local(volatile void *ptr, + unsigned long old, + unsigned long new, int size) +{ + switch (size) { + case 4: + return __cmpxchg_local_u32(ptr, old, new); + default: + return __cmpxchg_local_generic(ptr, old, new, size); + } + + return old; +} + +/* + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make + * them available. + */ +#define cmpxchg_local(ptr, o, n) \ + ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \ + (unsigned long)(n), sizeof(*(ptr)))) +#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #endif /* __KERNEL__ */ |