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[PATCH] m32r: Introduce atomic_cmpxchg and atomic_inc_not_zero operations

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Introduce atomic_cmpxchg and atomic_inc_not_zero operations for m32r.

Signed-off-by: Hayato Fujiwara <fujiwara@linux-m32r.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hirokazu Takata 2005-11-28 13:43:59 -08:00 • committed by Linus Torvalds
parent 91f4ab056d
commit 0332db5aff
2 changed files with 83 additions and 2 deletions
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64
include/asm-m32r/system.h
View file

@ -11,6 +11,7 @@
*/
#include <linux/config.h>
#include <asm/assembler.h>
#ifdef __KERNEL__
@ -132,8 +133,6 @@ static inline void local_irq_disable(void)
!(flags & 0x40); \
})
#endif /* __KERNEL__ */
#define nop() __asm__ __volatile__ ("nop" : : )
#define xchg(ptr,x) \
@ -213,6 +212,67 @@ static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr,
return (tmp);
}
#define __HAVE_ARCH_CMPXCHG 1
static __inline__ unsigned long
__cmpxchg_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")
M32R_LOCK" %0, @%1; \n"
" bne %0, %2, 1f; \n"
M32R_UNLOCK" %3, @%1; \n"
" bra 2f; \n"
" .fillinsn \n"
"1:"
M32R_UNLOCK" %2, @%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);
static __inline__ unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
{
switch (size) {
case 4:
return __cmpxchg_u32(ptr, old, new);
#if 0 /* we don't have __cmpxchg_u64 */
case 8:
return __cmpxchg_u64(ptr, old, new);
#endif /* 0 */
}
__cmpxchg_called_with_bad_pointer();
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))); \
})
#endif /* __KERNEL__ */
/*
* Memory barrier.
*