attached. ron
Right from Linux. I am not comfortable inserting our headers in linux files.
Signed-off-by: Ronald G. Minnich <[email protected]> Index: include/arch/x86/arch/atomic.h =================================================================== --- include/arch/x86/arch/atomic.h (revision 0) +++ include/arch/x86/arch/atomic.h (revision 0) @@ -0,0 +1,69 @@ +#ifndef ARCH_ATOMIC_H +#define ARCH_ATOMIC_H + +/* + * Make sure gcc doesn't try to be clever and move things around + * on us. We need to use _exactly_ the address the user gave us, + * not some alias that contains the same information. + */ +struct atomic { volatile int counter; }; + +#define ATOMIC_INIT(i) { (i) } + +/* + * Atomic operations that C can't guarantee us. Useful for + * resource counting etc.. + */ + +/** + * atomic_read - read atomic variable + * @v: pointer of type struct atomic + * + * Atomically reads the value of @v. Note that the guaranteed + * useful range of an struct atomic is only 24 bits. + */ +#define atomic_read(v) ((v)->counter) + +/** + * atomic_set - set atomic variable + * @v: pointer of type struct atomic + * @i: required value + * + * Atomically sets the value of @v to @i. Note that the guaranteed + * useful range of an struct atomic is only 24 bits. + */ +#define atomic_set(v,i) (((v)->counter) = (i)) + +/** + * atomic_inc - increment atomic variable + * @v: pointer of type struct atomic + * + * Atomically increments @v by 1. Note that the guaranteed + * useful range of an struct atomic is only 24 bits. + */ +static __inline__ __attribute__((always_inline)) void atomic_inc(struct atomic *v) +{ + __asm__ __volatile__( + "lock ; incl %0" + :"=m" (v->counter) + :"m" (v->counter)); +} + +/** + * atomic_dec - decrement atomic variable + * @v: pointer of type struct atomic + * + * Atomically decrements @v by 1. Note that the guaranteed + * useful range of an struct atomic is only 24 bits. + */ +static __inline__ __attribute__((always_inline)) void atomic_dec(struct atomic *v) +{ + __asm__ __volatile__( + "lock ; decl %0" + :"=m" (v->counter) + :"m" (v->counter)); +} + + + +#endif /* ARCH_ATOMIC_H */
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