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Linux/tools/arch/x86/include/asm/atomic.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _TOOLS_LINUX_ASM_X86_ATOMIC_H
  3 #define _TOOLS_LINUX_ASM_X86_ATOMIC_H
  4 
  5 #include <linux/compiler.h>
  6 #include <linux/types.h>
  7 #include "rmwcc.h"
  8 
  9 #define LOCK_PREFIX "\n\tlock; "
 10 
 11 #include <asm/asm.h>
 12 #include <asm/cmpxchg.h>
 13 
 14 /*
 15  * Atomic operations that C can't guarantee us.  Useful for
 16  * resource counting etc..
 17  */
 18 
 19 #define ATOMIC_INIT(i)  { (i) }
 20 
 21 /**
 22  * atomic_read - read atomic variable
 23  * @v: pointer of type atomic_t
 24  *
 25  * Atomically reads the value of @v.
 26  */
 27 static inline int atomic_read(const atomic_t *v)
 28 {
 29         return READ_ONCE((v)->counter);
 30 }
 31 
 32 /**
 33  * atomic_set - set atomic variable
 34  * @v: pointer of type atomic_t
 35  * @i: required value
 36  *
 37  * Atomically sets the value of @v to @i.
 38  */
 39 static inline void atomic_set(atomic_t *v, int i)
 40 {
 41         v->counter = i;
 42 }
 43 
 44 /**
 45  * atomic_inc - increment atomic variable
 46  * @v: pointer of type atomic_t
 47  *
 48  * Atomically increments @v by 1.
 49  */
 50 static inline void atomic_inc(atomic_t *v)
 51 {
 52         asm volatile(LOCK_PREFIX "incl %0"
 53                      : "+m" (v->counter));
 54 }
 55 
 56 /**
 57  * atomic_dec_and_test - decrement and test
 58  * @v: pointer of type atomic_t
 59  *
 60  * Atomically decrements @v by 1 and
 61  * returns true if the result is 0, or false for all other
 62  * cases.
 63  */
 64 static inline int atomic_dec_and_test(atomic_t *v)
 65 {
 66         GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e");
 67 }
 68 
 69 static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new)
 70 {
 71         return cmpxchg(&v->counter, old, new);
 72 }
 73 
 74 static inline int test_and_set_bit(long nr, unsigned long *addr)
 75 {
 76         GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(bts), *addr, "Ir", nr, "%0", "c");
 77 }
 78 
 79 static inline int test_and_clear_bit(long nr, unsigned long *addr)
 80 {
 81         GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(btc), *addr, "Ir", nr, "%0", "c");
 82 }
 83 
 84 #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */
 85 

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