/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _TOOLS_LINUX_ASM_X86_ATOMIC_H
#define _TOOLS_LINUX_ASM_X86_ATOMIC_H
#include <linux/compiler.h>
#include <linux/types.h>
#include "rmwcc.h"
#define LOCK_PREFIX "\n\tlock; "
#include <asm /asm .h>
#include <asm /cmpxchg.h>
/*
* Atomic operations that C can ' t guarantee us . Useful for
* resource counting etc . .
*/
#define ATOMIC_INIT(i) { (i) }
/**
* atomic_read - read atomic variable
* @ v : pointer of type atomic_t
*
* Atomically reads the value of @ v .
*/
static inline int atomic_read(const atomic_t *v)
{
return READ_ONCE((v)->counter);
}
/**
* atomic_set - set atomic variable
* @ v : pointer of type atomic_t
* @ i : required value
*
* Atomically sets the value of @ v to @ i .
*/
static inline void atomic_set(atomic_t *v, int i)
{
v->counter = i;
}
/**
* atomic_inc - increment atomic variable
* @ v : pointer of type atomic_t
*
* Atomically increments @ v by 1 .
*/
static inline void atomic_inc(atomic_t *v)
{
asm volatile (LOCK_PREFIX "incl %0"
: "+m" (v->counter));
}
/**
* atomic_dec_and_test - decrement and test
* @ v : pointer of type atomic_t
*
* Atomically decrements @ v by 1 and
* returns true if the result is 0 , or false for all other
* cases .
*/
static inline int atomic_dec_and_test(atomic_t *v)
{
GEN_UNARY_RMWcc(LOCK_PREFIX "decl" , v->counter, "%0" , "e" );
}
static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new )
{
return cmpxchg(&v->counter, old, new );
}
static inline int test_and_set_bit(long nr, unsigned long *addr)
{
GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(bts), *addr, "Ir" , nr, "%0" , "c" );
}
static inline int test_and_clear_bit(long nr, unsigned long *addr)
{
GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(btc), *addr, "Ir" , nr, "%0" , "c" );
}
#endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */
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(vorverarbeitet am 2026-10-02)
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