| #ifndef __ARCH_X86_64_ATOMIC__ |
| #define __ARCH_X86_64_ATOMIC__ |
| |
| #include <asm/alternative.h> |
| |
| /* atomic_t should be 32 bit signed type */ |
| |
| /* |
| * Atomic operations that C can't guarantee us. Useful for |
| * resource counting etc.. |
| */ |
| |
| #ifdef CONFIG_SMP |
| #define LOCK "lock ; " |
| #else |
| #define LOCK "" |
| #endif |
| |
| /* |
| * 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. |
| */ |
| typedef struct { int counter; } atomic_t; |
| |
| #define ATOMIC_INIT(i) { (i) } |
| |
| /** |
| * atomic_read - read atomic variable |
| * @v: pointer of type atomic_t |
| * |
| * Atomically reads the value of @v. |
| */ |
| #define atomic_read(v) ((v)->counter) |
| |
| /** |
| * atomic_set - set atomic variable |
| * @v: pointer of type atomic_t |
| * @i: required value |
| * |
| * Atomically sets the value of @v to @i. |
| */ |
| #define atomic_set(v,i) (((v)->counter) = (i)) |
| |
| /** |
| * atomic_add - add integer to atomic variable |
| * @i: integer value to add |
| * @v: pointer of type atomic_t |
| * |
| * Atomically adds @i to @v. |
| */ |
| static __inline__ void atomic_add(int i, atomic_t *v) |
| { |
| __asm__ __volatile__( |
| LOCK_PREFIX "addl %1,%0" |
| :"=m" (v->counter) |
| :"ir" (i), "m" (v->counter)); |
| } |
| |
| /** |
| * atomic_sub - subtract the atomic variable |
| * @i: integer value to subtract |
| * @v: pointer of type atomic_t |
| * |
| * Atomically subtracts @i from @v. |
| */ |
| static __inline__ void atomic_sub(int i, atomic_t *v) |
| { |
| __asm__ __volatile__( |
| LOCK_PREFIX "subl %1,%0" |
| :"=m" (v->counter) |
| :"ir" (i), "m" (v->counter)); |
| } |
| |
| /** |
| * atomic_sub_and_test - subtract value from variable and test result |
| * @i: integer value to subtract |
| * @v: pointer of type atomic_t |
| * |
| * Atomically subtracts @i from @v and returns |
| * true if the result is zero, or false for all |
| * other cases. |
| */ |
| static __inline__ int atomic_sub_and_test(int i, atomic_t *v) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "subl %2,%0; sete %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"ir" (i), "m" (v->counter) : "memory"); |
| return c; |
| } |
| |
| /** |
| * 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) |
| :"m" (v->counter)); |
| } |
| |
| /** |
| * atomic_dec - decrement atomic variable |
| * @v: pointer of type atomic_t |
| * |
| * Atomically decrements @v by 1. |
| */ |
| static __inline__ void atomic_dec(atomic_t *v) |
| { |
| __asm__ __volatile__( |
| LOCK_PREFIX "decl %0" |
| :"=m" (v->counter) |
| :"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) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "decl %0; sete %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"m" (v->counter) : "memory"); |
| return c != 0; |
| } |
| |
| /** |
| * atomic_inc_and_test - increment and test |
| * @v: pointer of type atomic_t |
| * |
| * Atomically increments @v by 1 |
| * and returns true if the result is zero, or false for all |
| * other cases. |
| */ |
| static __inline__ int atomic_inc_and_test(atomic_t *v) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "incl %0; sete %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"m" (v->counter) : "memory"); |
| return c != 0; |
| } |
| |
| /** |
| * atomic_add_negative - add and test if negative |
| * @i: integer value to add |
| * @v: pointer of type atomic_t |
| * |
| * Atomically adds @i to @v and returns true |
| * if the result is negative, or false when |
| * result is greater than or equal to zero. |
| */ |
| static __inline__ int atomic_add_negative(int i, atomic_t *v) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "addl %2,%0; sets %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"ir" (i), "m" (v->counter) : "memory"); |
| return c; |
| } |
| |
| /** |
| * atomic_add_return - add and return |
| * @i: integer value to add |
| * @v: pointer of type atomic_t |
| * |
| * Atomically adds @i to @v and returns @i + @v |
| */ |
| static __inline__ int atomic_add_return(int i, atomic_t *v) |
| { |
| int __i = i; |
| __asm__ __volatile__( |
| LOCK_PREFIX "xaddl %0, %1" |
| :"+r" (i), "+m" (v->counter) |
| : : "memory"); |
| return i + __i; |
| } |
| |
| static __inline__ int atomic_sub_return(int i, atomic_t *v) |
| { |
| return atomic_add_return(-i,v); |
| } |
| |
| #define atomic_inc_return(v) (atomic_add_return(1,v)) |
| #define atomic_dec_return(v) (atomic_sub_return(1,v)) |
| |
| /* An 64bit atomic type */ |
| |
| typedef struct { volatile long counter; } atomic64_t; |
| |
| #define ATOMIC64_INIT(i) { (i) } |
| |
| /** |
| * atomic64_read - read atomic64 variable |
| * @v: pointer of type atomic64_t |
| * |
| * Atomically reads the value of @v. |
| * Doesn't imply a read memory barrier. |
| */ |
| #define atomic64_read(v) ((v)->counter) |
| |
| /** |
| * atomic64_set - set atomic64 variable |
| * @v: pointer to type atomic64_t |
| * @i: required value |
| * |
| * Atomically sets the value of @v to @i. |
| */ |
| #define atomic64_set(v,i) (((v)->counter) = (i)) |
| |
| /** |
| * atomic64_add - add integer to atomic64 variable |
| * @i: integer value to add |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically adds @i to @v. |
| */ |
| static __inline__ void atomic64_add(long i, atomic64_t *v) |
| { |
| __asm__ __volatile__( |
| LOCK_PREFIX "addq %1,%0" |
| :"=m" (v->counter) |
| :"ir" (i), "m" (v->counter)); |
| } |
| |
| /** |
| * atomic64_sub - subtract the atomic64 variable |
| * @i: integer value to subtract |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically subtracts @i from @v. |
| */ |
| static __inline__ void atomic64_sub(long i, atomic64_t *v) |
| { |
| __asm__ __volatile__( |
| LOCK_PREFIX "subq %1,%0" |
| :"=m" (v->counter) |
| :"ir" (i), "m" (v->counter)); |
| } |
| |
| /** |
| * atomic64_sub_and_test - subtract value from variable and test result |
| * @i: integer value to subtract |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically subtracts @i from @v and returns |
| * true if the result is zero, or false for all |
| * other cases. |
| */ |
| static __inline__ int atomic64_sub_and_test(long i, atomic64_t *v) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "subq %2,%0; sete %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"ir" (i), "m" (v->counter) : "memory"); |
| return c; |
| } |
| |
| /** |
| * atomic64_inc - increment atomic64 variable |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically increments @v by 1. |
| */ |
| static __inline__ void atomic64_inc(atomic64_t *v) |
| { |
| __asm__ __volatile__( |
| LOCK_PREFIX "incq %0" |
| :"=m" (v->counter) |
| :"m" (v->counter)); |
| } |
| |
| /** |
| * atomic64_dec - decrement atomic64 variable |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically decrements @v by 1. |
| */ |
| static __inline__ void atomic64_dec(atomic64_t *v) |
| { |
| __asm__ __volatile__( |
| LOCK_PREFIX "decq %0" |
| :"=m" (v->counter) |
| :"m" (v->counter)); |
| } |
| |
| /** |
| * atomic64_dec_and_test - decrement and test |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically decrements @v by 1 and |
| * returns true if the result is 0, or false for all other |
| * cases. |
| */ |
| static __inline__ int atomic64_dec_and_test(atomic64_t *v) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "decq %0; sete %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"m" (v->counter) : "memory"); |
| return c != 0; |
| } |
| |
| /** |
| * atomic64_inc_and_test - increment and test |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically increments @v by 1 |
| * and returns true if the result is zero, or false for all |
| * other cases. |
| */ |
| static __inline__ int atomic64_inc_and_test(atomic64_t *v) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "incq %0; sete %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"m" (v->counter) : "memory"); |
| return c != 0; |
| } |
| |
| /** |
| * atomic64_add_negative - add and test if negative |
| * @i: integer value to add |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically adds @i to @v and returns true |
| * if the result is negative, or false when |
| * result is greater than or equal to zero. |
| */ |
| static __inline__ int atomic64_add_negative(long i, atomic64_t *v) |
| { |
| unsigned char c; |
| |
| __asm__ __volatile__( |
| LOCK_PREFIX "addq %2,%0; sets %1" |
| :"=m" (v->counter), "=qm" (c) |
| :"ir" (i), "m" (v->counter) : "memory"); |
| return c; |
| } |
| |
| /** |
| * atomic64_add_return - add and return |
| * @i: integer value to add |
| * @v: pointer to type atomic64_t |
| * |
| * Atomically adds @i to @v and returns @i + @v |
| */ |
| static __inline__ long atomic64_add_return(long i, atomic64_t *v) |
| { |
| long __i = i; |
| __asm__ __volatile__( |
| LOCK_PREFIX "xaddq %0, %1;" |
| :"=r"(i) |
| :"m"(v->counter), "0"(i)); |
| return i + __i; |
| } |
| |
| static __inline__ long atomic64_sub_return(long i, atomic64_t *v) |
| { |
| return atomic64_add_return(-i,v); |
| } |
| |
| #define atomic64_inc_return(v) (atomic64_add_return(1,v)) |
| #define atomic64_dec_return(v) (atomic64_sub_return(1,v)) |
| |
| #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) |
| #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
| |
| /** |
| * atomic_add_unless - add unless the number is a given value |
| * @v: pointer of type atomic_t |
| * @a: the amount to add to v... |
| * @u: ...unless v is equal to u. |
| * |
| * Atomically adds @a to @v, so long as it was not @u. |
| * Returns non-zero if @v was not @u, and zero otherwise. |
| */ |
| #define atomic_add_unless(v, a, u) \ |
| ({ \ |
| int c, old; \ |
| c = atomic_read(v); \ |
| for (;;) { \ |
| if (unlikely(c == (u))) \ |
| break; \ |
| old = atomic_cmpxchg((v), c, c + (a)); \ |
| if (likely(old == c)) \ |
| break; \ |
| c = old; \ |
| } \ |
| c != (u); \ |
| }) |
| #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| |
| /* These are x86-specific, used by some header files */ |
| #define atomic_clear_mask(mask, addr) \ |
| __asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \ |
| : : "r" (~(mask)),"m" (*addr) : "memory") |
| |
| #define atomic_set_mask(mask, addr) \ |
| __asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \ |
| : : "r" ((unsigned)mask),"m" (*(addr)) : "memory") |
| |
| /* Atomic operations are already serializing on x86 */ |
| #define smp_mb__before_atomic_dec() barrier() |
| #define smp_mb__after_atomic_dec() barrier() |
| #define smp_mb__before_atomic_inc() barrier() |
| #define smp_mb__after_atomic_inc() barrier() |
| |
| #include <asm-generic/atomic.h> |
| #endif |