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linux-next/include/asm-sh/futex-irq.h
Kaz Kojima fc1d4c9c37 sh: Fix up futex implementation.
SH is able to support a complete futex implementation on UP by way
of gUSA. However, IRQ toggling must be done for the old CPUs that
don't have movli.l/movco.l (LL/SC) instructions. Provide a default
implementation that does this, so it's possible to optimize for
newer CPUs.

Follows the same scheme as the current asm-sh/atomic-*.h headers.

Signed-off-by: Kaz Kojima <kkojima@rr.iij4u.or.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-06-18 13:58:32 +09:00

112 lines
1.8 KiB
C

#ifndef __ASM_SH_FUTEX_IRQ_H
#define __ASM_SH_FUTEX_IRQ_H
#include <asm/system.h>
static inline int atomic_futex_op_xchg_set(int oparg, int __user *uaddr,
int *oldval)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = get_user(*oldval, uaddr);
if (!ret)
ret = put_user(oparg, uaddr);
local_irq_restore(flags);
return ret;
}
static inline int atomic_futex_op_xchg_add(int oparg, int __user *uaddr,
int *oldval)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = get_user(*oldval, uaddr);
if (!ret)
ret = put_user(*oldval + oparg, uaddr);
local_irq_restore(flags);
return ret;
}
static inline int atomic_futex_op_xchg_or(int oparg, int __user *uaddr,
int *oldval)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = get_user(*oldval, uaddr);
if (!ret)
ret = put_user(*oldval | oparg, uaddr);
local_irq_restore(flags);
return ret;
}
static inline int atomic_futex_op_xchg_and(int oparg, int __user *uaddr,
int *oldval)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = get_user(*oldval, uaddr);
if (!ret)
ret = put_user(*oldval & oparg, uaddr);
local_irq_restore(flags);
return ret;
}
static inline int atomic_futex_op_xchg_xor(int oparg, int __user *uaddr,
int *oldval)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = get_user(*oldval, uaddr);
if (!ret)
ret = put_user(*oldval ^ oparg, uaddr);
local_irq_restore(flags);
return ret;
}
static inline int atomic_futex_op_cmpxchg_inatomic(int __user *uaddr,
int oldval, int newval)
{
unsigned long flags;
int ret, prev = 0;
local_irq_save(flags);
ret = get_user(prev, uaddr);
if (!ret && oldval == prev)
ret = put_user(newval, uaddr);
local_irq_restore(flags);
if (ret)
return ret;
return prev;
}
#endif /* __ASM_SH_FUTEX_IRQ_H */