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sh: Split out atomic ops logically.

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We have a few different ways to do the atomic operations, so split
them out in to different headers rather than bloating atomic.h.
Kernelspace gUSA will take this up to a third implementation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2006-12-07 20:33:38 +09:00
parent a45e724ba0
commit ec723fbe7e
3 changed files with 180 additions and 151 deletions
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71
include/asm-sh/atomic-irq.h Normal file
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#ifndef __ASM_SH_ATOMIC_IRQ_H
#define __ASM_SH_ATOMIC_IRQ_H
/*
* To get proper branch prediction for the main line, we must branch
* forward to code at the end of this object's .text section, then
* branch back to restart the operation.
*/
static inline void atomic_add(int i, atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
*(long *)v += i;
local_irq_restore(flags);
}
static inline void atomic_sub(int i, atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
*(long *)v -= i;
local_irq_restore(flags);
}
static inline int atomic_add_return(int i, atomic_t *v)
{
unsigned long temp, flags;
local_irq_save(flags);
temp = *(long *)v;
temp += i;
*(long *)v = temp;
local_irq_restore(flags);
return temp;
}
static inline int atomic_sub_return(int i, atomic_t *v)
{
unsigned long temp, flags;
local_irq_save(flags);
temp = *(long *)v;
temp -= i;
*(long *)v = temp;
local_irq_restore(flags);
return temp;
}
static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
*(long *)v &= ~mask;
local_irq_restore(flags);
}
static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
{
unsigned long flags;
local_irq_save(flags);
*(long *)v |= mask;
local_irq_restore(flags);
}
#endif /* __ASM_SH_ATOMIC_IRQ_H */