mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 08:26:29 +00:00
ec723fbe7e
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>
72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
#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 */
|