43e40f25d2
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
147 lines
3.6 KiB
C
147 lines
3.6 KiB
C
#ifndef _ASM_IA64_CMPXCHG_H
|
|
#define _ASM_IA64_CMPXCHG_H
|
|
|
|
/*
|
|
* Compare/Exchange, forked from asm/intrinsics.h
|
|
* which was:
|
|
*
|
|
* Copyright (C) 2002-2003 Hewlett-Packard Co
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
*/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/types.h>
|
|
/* include compiler specific intrinsics */
|
|
#include <asm/ia64regs.h>
|
|
#ifdef __INTEL_COMPILER
|
|
# include <asm/intel_intrin.h>
|
|
#else
|
|
# include <asm/gcc_intrin.h>
|
|
#endif
|
|
|
|
/*
|
|
* This function doesn't exist, so you'll get a linker error if
|
|
* something tries to do an invalid xchg().
|
|
*/
|
|
extern void ia64_xchg_called_with_bad_pointer(void);
|
|
|
|
#define __xchg(x, ptr, size) \
|
|
({ \
|
|
unsigned long __xchg_result; \
|
|
\
|
|
switch (size) { \
|
|
case 1: \
|
|
__xchg_result = ia64_xchg1((__u8 *)ptr, x); \
|
|
break; \
|
|
\
|
|
case 2: \
|
|
__xchg_result = ia64_xchg2((__u16 *)ptr, x); \
|
|
break; \
|
|
\
|
|
case 4: \
|
|
__xchg_result = ia64_xchg4((__u32 *)ptr, x); \
|
|
break; \
|
|
\
|
|
case 8: \
|
|
__xchg_result = ia64_xchg8((__u64 *)ptr, x); \
|
|
break; \
|
|
default: \
|
|
ia64_xchg_called_with_bad_pointer(); \
|
|
} \
|
|
__xchg_result; \
|
|
})
|
|
|
|
#define xchg(ptr, x) \
|
|
((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
|
|
|
|
/*
|
|
* Atomic compare and exchange. Compare OLD with MEM, if identical,
|
|
* store NEW in MEM. Return the initial value in MEM. Success is
|
|
* indicated by comparing RETURN with OLD.
|
|
*/
|
|
|
|
#define __HAVE_ARCH_CMPXCHG 1
|
|
|
|
/*
|
|
* This function doesn't exist, so you'll get a linker error
|
|
* if something tries to do an invalid cmpxchg().
|
|
*/
|
|
extern long ia64_cmpxchg_called_with_bad_pointer(void);
|
|
|
|
#define ia64_cmpxchg(sem, ptr, old, new, size) \
|
|
({ \
|
|
__u64 _o_, _r_; \
|
|
\
|
|
switch (size) { \
|
|
case 1: \
|
|
_o_ = (__u8) (long) (old); \
|
|
break; \
|
|
case 2: \
|
|
_o_ = (__u16) (long) (old); \
|
|
break; \
|
|
case 4: \
|
|
_o_ = (__u32) (long) (old); \
|
|
break; \
|
|
case 8: \
|
|
_o_ = (__u64) (long) (old); \
|
|
break; \
|
|
default: \
|
|
break; \
|
|
} \
|
|
switch (size) { \
|
|
case 1: \
|
|
_r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_); \
|
|
break; \
|
|
\
|
|
case 2: \
|
|
_r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_); \
|
|
break; \
|
|
\
|
|
case 4: \
|
|
_r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_); \
|
|
break; \
|
|
\
|
|
case 8: \
|
|
_r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_); \
|
|
break; \
|
|
\
|
|
default: \
|
|
_r_ = ia64_cmpxchg_called_with_bad_pointer(); \
|
|
break; \
|
|
} \
|
|
(__typeof__(old)) _r_; \
|
|
})
|
|
|
|
#define cmpxchg_acq(ptr, o, n) \
|
|
ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
|
|
#define cmpxchg_rel(ptr, o, n) \
|
|
ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
|
|
|
|
/* for compatibility with other platforms: */
|
|
#define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n))
|
|
#define cmpxchg64(ptr, o, n) cmpxchg_acq((ptr), (o), (n))
|
|
|
|
#define cmpxchg_local cmpxchg
|
|
#define cmpxchg64_local cmpxchg64
|
|
|
|
#ifdef CONFIG_IA64_DEBUG_CMPXCHG
|
|
# define CMPXCHG_BUGCHECK_DECL int _cmpxchg_bugcheck_count = 128;
|
|
# define CMPXCHG_BUGCHECK(v) \
|
|
do { \
|
|
if (_cmpxchg_bugcheck_count-- <= 0) { \
|
|
void *ip; \
|
|
extern int printk(const char *fmt, ...); \
|
|
ip = (void *) ia64_getreg(_IA64_REG_IP); \
|
|
printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
|
|
break; \
|
|
} \
|
|
} while (0)
|
|
#else /* !CONFIG_IA64_DEBUG_CMPXCHG */
|
|
# define CMPXCHG_BUGCHECK_DECL
|
|
# define CMPXCHG_BUGCHECK(v)
|
|
#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_IA64_CMPXCHG_H */
|