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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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
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#define __ASM_SH_ATOMIC_IRQ_H
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/*
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* To get proper branch prediction for the main line, we must branch
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* forward to code at the end of this object's .text section, then
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* branch back to restart the operation.
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*/
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static inline void atomic_add(int i, atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v += i;
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local_irq_restore(flags);
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}
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static inline void atomic_sub(int i, atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v -= i;
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local_irq_restore(flags);
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}
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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unsigned long temp, flags;
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local_irq_save(flags);
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temp = *(long *)v;
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temp += i;
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*(long *)v = temp;
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local_irq_restore(flags);
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return temp;
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}
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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unsigned long temp, flags;
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local_irq_save(flags);
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temp = *(long *)v;
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temp -= i;
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*(long *)v = temp;
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local_irq_restore(flags);
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return temp;
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}
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static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v &= ~mask;
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local_irq_restore(flags);
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}
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static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v |= mask;
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local_irq_restore(flags);
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}
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#endif /* __ASM_SH_ATOMIC_IRQ_H */
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