mirror of
https://github.com/checkpoint-restore/criu.git
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70833bcf29
Acked-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Adrian Reber <areber@redhat.com>
143 lines
3 KiB
C
143 lines
3 KiB
C
#ifndef __CR_ATOMIC_H__
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#define __CR_ATOMIC_H__
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#include <linux/types.h>
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#include "common/compiler.h"
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#include "common/arch/mips/asm/utils.h"
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#include "common/arch/mips/asm/cmpxchg.h"
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/*
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* atomic_read - read atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically reads the value of @v.
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*/
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#define atomic_read(v) (*(volatile int *)&(v)->counter)
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/*
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* atomic_set - set atomic variable
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* @v: pointer of type atomic_t
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* @i: required value
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*
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* Atomically sets the value of @v to @i.
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*/
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#define atomic_set(v, i) ((v)->counter = (i))
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/*
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* atomic_add - add integer to atomic variable
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* @i: integer value to add
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* @v: pointer of type atomic_t
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*
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* Atomically adds @i to @v.
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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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int temp;
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do {
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__asm__ __volatile__(" .set mips3 \n"
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" ll %0, %1 # atomic_add \n"
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" addu %0, %2 \n"
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" sc %0, %1 \n"
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" .set mips0 \n"
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: "=&r"(temp), "+m"(v->counter)
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: "Ir"(i));
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} while (unlikely(!temp));
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}
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/*
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* atomic_sub - subtract the atomic variable
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* @i: integer value to subtract
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* @v: pointer of type atomic_t
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*
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* Atomically subtracts @i from @v.
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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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int temp;
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do {
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__asm__ __volatile__(" .set mips3 \n"
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" ll %0, %1 # atomic_sub \n"
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" subu %0, %2 \n"
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" sc %0, %1 \n"
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" .set mips0 \n"
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: "=&r"(temp), "+m"(v->counter)
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: "Ir"(i));
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} while (unlikely(!temp));
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}
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/*
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* Same as above, but return the result value
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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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int result;
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smp_mb__before_llsc();
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int temp;
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do {
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__asm__ __volatile__(" .set mips3 \n"
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" ll %1, %2 # atomic_add_return \n"
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" addu %0, %1, %3 \n"
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" sc %0, %2 \n"
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" .set mips0 \n"
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: "=&r"(result), "=&r"(temp), "+m"(v->counter)
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: "Ir"(i));
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} while (unlikely(!result));
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result = temp + i;
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smp_llsc_mb();
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return result;
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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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int result;
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smp_mb__before_llsc();
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int temp;
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do {
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__asm__ __volatile__(" .set mips3 \n"
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" ll %1, %2 # atomic_sub_return \n"
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" subu %0, %1, %3 \n"
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" sc %0, %2 \n"
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" .set mips0 \n"
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: "=&r"(result), "=&r"(temp), "+m"(v->counter)
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: "Ir"(i));
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} while (unlikely(!result));
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result = temp - i;
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smp_llsc_mb();
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return result;
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}
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#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
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#define atomic_dec_return(v) atomic_sub_return(1, (v))
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#define atomic_inc_return(v) atomic_add_return(1, (v))
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/*
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* atomic_inc - increment atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1.
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*/
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#define atomic_inc(v) atomic_add(1, (v))
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/*
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* atomic_dec - decrement and test
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* @v: pointer of type atomic_t
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*
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* Atomically decrements @v by 1.
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*/
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#define atomic_dec(v) atomic_sub(1, (v))
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#endif /* __CR_ATOMIC_H__ */
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