diff options
Diffstat (limited to 'include/asm-x86_64/local.h')
| -rw-r--r-- | include/asm-x86_64/local.h | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/include/asm-x86_64/local.h b/include/asm-x86_64/local.h deleted file mode 100644 index e87492b..0000000 --- a/include/asm-x86_64/local.h +++ /dev/null @@ -1,222 +0,0 @@ -#ifndef _ARCH_X8664_LOCAL_H -#define _ARCH_X8664_LOCAL_H - -#include <linux/percpu.h> -#include <asm/atomic.h> - -typedef struct -{ - atomic_long_t a; -} local_t; - -#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } - -#define local_read(l) atomic_long_read(&(l)->a) -#define local_set(l,i) atomic_long_set(&(l)->a, (i)) - -static inline void local_inc(local_t *l) -{ - __asm__ __volatile__( - "incq %0" - :"=m" (l->a.counter) - :"m" (l->a.counter)); -} - -static inline void local_dec(local_t *l) -{ - __asm__ __volatile__( - "decq %0" - :"=m" (l->a.counter) - :"m" (l->a.counter)); -} - -static inline void local_add(long i, local_t *l) -{ - __asm__ __volatile__( - "addq %1,%0" - :"=m" (l->a.counter) - :"ir" (i), "m" (l->a.counter)); -} - -static inline void local_sub(long i, local_t *l) -{ - __asm__ __volatile__( - "subq %1,%0" - :"=m" (l->a.counter) - :"ir" (i), "m" (l->a.counter)); -} - -/** - * local_sub_and_test - subtract value from variable and test result - * @i: integer value to subtract - * @l: pointer to type local_t - * - * Atomically subtracts @i from @l and returns - * true if the result is zero, or false for all - * other cases. - */ -static __inline__ int local_sub_and_test(long i, local_t *l) -{ - unsigned char c; - - __asm__ __volatile__( - "subq %2,%0; sete %1" - :"=m" (l->a.counter), "=qm" (c) - :"ir" (i), "m" (l->a.counter) : "memory"); - return c; -} - -/** - * local_dec_and_test - decrement and test - * @l: pointer to type local_t - * - * Atomically decrements @l by 1 and - * returns true if the result is 0, or false for all other - * cases. - */ -static __inline__ int local_dec_and_test(local_t *l) -{ - unsigned char c; - - __asm__ __volatile__( - "decq %0; sete %1" - :"=m" (l->a.counter), "=qm" (c) - :"m" (l->a.counter) : "memory"); - return c != 0; -} - -/** - * local_inc_and_test - increment and test - * @l: pointer to type local_t - * - * Atomically increments @l by 1 - * and returns true if the result is zero, or false for all - * other cases. - */ -static __inline__ int local_inc_and_test(local_t *l) -{ - unsigned char c; - - __asm__ __volatile__( - "incq %0; sete %1" - :"=m" (l->a.counter), "=qm" (c) - :"m" (l->a.counter) : "memory"); - return c != 0; -} - -/** - * local_add_negative - add and test if negative - * @i: integer value to add - * @l: pointer to type local_t - * - * Atomically adds @i to @l and returns true - * if the result is negative, or false when - * result is greater than or equal to zero. - */ -static __inline__ int local_add_negative(long i, local_t *l) -{ - unsigned char c; - - __asm__ __volatile__( - "addq %2,%0; sets %1" - :"=m" (l->a.counter), "=qm" (c) - :"ir" (i), "m" (l->a.counter) : "memory"); - return c; -} - -/** - * local_add_return - add and return - * @i: integer value to add - * @l: pointer to type local_t - * - * Atomically adds @i to @l and returns @i + @l - */ -static __inline__ long local_add_return(long i, local_t *l) -{ - long __i = i; - __asm__ __volatile__( - "xaddq %0, %1;" - :"+r" (i), "+m" (l->a.counter) - : : "memory"); - return i + __i; -} - -static __inline__ long local_sub_return(long i, local_t *l) -{ - return local_add_return(-i,l); -} - -#define local_inc_return(l) (local_add_return(1,l)) -#define local_dec_return(l) (local_sub_return(1,l)) - -#define local_cmpxchg(l, o, n) \ - (cmpxchg_local(&((l)->a.counter), (o), (n))) -/* Always has a lock prefix */ -#define local_xchg(l, n) (xchg(&((l)->a.counter), (n))) - -/** - * atomic_up_add_unless - add unless the number is a given value - * @l: pointer of type local_t - * @a: the amount to add to l... - * @u: ...unless l is equal to u. - * - * Atomically adds @a to @l, so long as it was not @u. - * Returns non-zero if @l was not @u, and zero otherwise. - */ -#define local_add_unless(l, a, u) \ -({ \ - long c, old; \ - c = local_read(l); \ - for (;;) { \ - if (unlikely(c == (u))) \ - break; \ - old = local_cmpxchg((l), c, c + (a)); \ - if (likely(old == c)) \ - break; \ - c = old; \ - } \ - c != (u); \ -}) -#define local_inc_not_zero(l) local_add_unless((l), 1, 0) - -/* On x86-64 these are better than the atomic variants on SMP kernels - because they dont use a lock prefix. */ -#define __local_inc(l) local_inc(l) -#define __local_dec(l) local_dec(l) -#define __local_add(i,l) local_add((i),(l)) -#define __local_sub(i,l) local_sub((i),(l)) - -/* Use these for per-cpu local_t variables: on some archs they are - * much more efficient than these naive implementations. Note they take - * a variable, not an address. - * - * This could be done better if we moved the per cpu data directly - * after GS. - */ - -/* Need to disable preemption for the cpu local counters otherwise we could - still access a variable of a previous CPU in a non atomic way. */ -#define cpu_local_wrap_v(l) \ - ({ local_t res__; \ - preempt_disable(); \ - res__ = (l); \ - preempt_enable(); \ - res__; }) -#define cpu_local_wrap(l) \ - ({ preempt_disable(); \ - l; \ - preempt_enable(); }) \ - -#define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l))) -#define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i))) -#define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l))) -#define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l))) -#define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l))) -#define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l))) - -#define __cpu_local_inc(l) cpu_local_inc(l) -#define __cpu_local_dec(l) cpu_local_dec(l) -#define __cpu_local_add(i, l) cpu_local_add((i), (l)) -#define __cpu_local_sub(i, l) cpu_local_sub((i), (l)) - -#endif /* _ARCH_X8664_LOCAL_H */ |
