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Implement the _long functions using u_long rather than trying to

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cast as uint32_t which is defined as unsigned int. gcc doesn't want to
consider that there might not be much difference between an int and
a long on a 32 bit architecture.
This commit is contained in:
John Birrell 2007-11-26 05:52:45 +00:00
parent 1b655ceb37
commit ba90c265b0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=173928
1 changed files with 43 additions and 5 deletions
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48
sys/powerpc/include/atomic.h
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@ -390,6 +390,32 @@ atomic_cmpset_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval)
return (ret);
}
static __inline u_long
atomic_cmpset_long(volatile u_long* p, u_long cmpval, u_long newval)
{
uint32_t ret;
#ifdef __GNUCLIKE_ASM
__asm __volatile (
"1:\tlwarx %0, 0, %2\n\t" /* load old value */
"cmplw %3, %0\n\t" /* compare */
"bne 2f\n\t" /* exit if not equal */
"stwcx. %4, 0, %2\n\t" /* attempt to store */
"bne- 1b\n\t" /* spin if failed */
"li %0, 1\n\t" /* success - retval = 1 */
"b 3f\n\t" /* we've succeeded */
"2:\n\t"
"stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
"li %0, 0\n\t" /* failure - retval = 0 */
"3:\n\t"
: "=&r" (ret), "=m" (*p)
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p)
: "cc", "memory");
#endif
return (ret);
}
#if 0
/*
@ -413,7 +439,6 @@ atomic_cmpset_64(volatile u_int64_t* p, u_int64_t cmpval, u_int64_t newval)
#endif /* 0 */
#define atomic_cmpset_int atomic_cmpset_32
#define atomic_cmpset_long atomic_cmpset_32
#define atomic_cmpset_ptr(dst, old, new) \
atomic_cmpset_32((volatile u_int *)(dst), (u_int)(old), (u_int)(new))
@ -439,12 +464,25 @@ atomic_cmpset_rel_32(volatile uint32_t *p, uint32_t cmpval, uint32_t newval)
return (atomic_cmpset_32(p, cmpval, newval));
}
static __inline u_long
atomic_cmpset_acq_long(volatile u_long *p, u_long cmpval, u_long newval)
{
int retval;
retval = atomic_cmpset_long(p, cmpval, newval);
powerpc_mb();
return (retval);
}
static __inline uint32_t
atomic_cmpset_rel_long(volatile u_long *p, u_long cmpval, u_long newval)
{
powerpc_mb();
return (atomic_cmpset_long(p, cmpval, newval));
}
#define atomic_cmpset_acq_int atomic_cmpset_acq_32
#define atomic_cmpset_rel_int atomic_cmpset_rel_32
#define atomic_cmpset_acq_long(dst, old, new) \
atomic_cmpset_acq_32((volatile u_int *)(dst), (u_int)(old), (u_int)(new))
#define atomic_cmpset_rel_long(dst, old, new) \
atomic_cmpset_rel_32((volatile u_int *)(dst), (u_int)(old), (u_int)(new))
#define atomic_cmpset_acq_ptr(dst, old, new) \
atomic_cmpset_acq_32((volatile u_int *)(dst), (u_int)(old), (u_int)(new))