mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 02:37:15 +07:00
658aa51459
Implement atomic logic ops -- atomic_{or,xor,and}.
These will replace the atomic_{set,clear}_mask functions that are
available on some archs.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
#ifndef __ASM_SH_ATOMIC_LLSC_H
|
|
#define __ASM_SH_ATOMIC_LLSC_H
|
|
|
|
/*
|
|
* SH-4A note:
|
|
*
|
|
* We basically get atomic_xxx_return() for free compared with
|
|
* atomic_xxx(). movli.l/movco.l require r0 due to the instruction
|
|
* encoding, so the retval is automatically set without having to
|
|
* do any special work.
|
|
*/
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#define ATOMIC_OP(op) \
|
|
static inline void atomic_##op(int i, atomic_t *v) \
|
|
{ \
|
|
unsigned long tmp; \
|
|
\
|
|
__asm__ __volatile__ ( \
|
|
"1: movli.l @%2, %0 ! atomic_" #op "\n" \
|
|
" " #op " %1, %0 \n" \
|
|
" movco.l %0, @%2 \n" \
|
|
" bf 1b \n" \
|
|
: "=&z" (tmp) \
|
|
: "r" (i), "r" (&v->counter) \
|
|
: "t"); \
|
|
}
|
|
|
|
#define ATOMIC_OP_RETURN(op) \
|
|
static inline int atomic_##op##_return(int i, atomic_t *v) \
|
|
{ \
|
|
unsigned long temp; \
|
|
\
|
|
__asm__ __volatile__ ( \
|
|
"1: movli.l @%2, %0 ! atomic_" #op "_return \n" \
|
|
" " #op " %1, %0 \n" \
|
|
" movco.l %0, @%2 \n" \
|
|
" bf 1b \n" \
|
|
" synco \n" \
|
|
: "=&z" (temp) \
|
|
: "r" (i), "r" (&v->counter) \
|
|
: "t"); \
|
|
\
|
|
return temp; \
|
|
}
|
|
|
|
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
|
|
|
|
ATOMIC_OPS(add)
|
|
ATOMIC_OPS(sub)
|
|
ATOMIC_OP(and)
|
|
ATOMIC_OP(or)
|
|
ATOMIC_OP(xor)
|
|
|
|
#undef ATOMIC_OPS
|
|
#undef ATOMIC_OP_RETURN
|
|
#undef ATOMIC_OP
|
|
|
|
#endif /* __ASM_SH_ATOMIC_LLSC_H */
|