#ifndef __ARCH_X86_64_ATOMIC__
#define __ARCH_X86_64_ATOMIC__
-#include <linux/config.h>
+#include <asm/alternative.h>
/* atomic_t should be 32 bit signed type */
* on us. We need to use _exactly_ the address the user gave us,
* not some alias that contains the same information.
*/
-typedef struct { volatile int counter; } atomic_t;
+typedef struct { int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
static __inline__ void atomic_add(int i, atomic_t *v)
{
__asm__ __volatile__(
- LOCK "addl %1,%0"
+ LOCK_PREFIX "addl %1,%0"
:"=m" (v->counter)
:"ir" (i), "m" (v->counter));
}
static __inline__ void atomic_sub(int i, atomic_t *v)
{
__asm__ __volatile__(
- LOCK "subl %1,%0"
+ LOCK_PREFIX "subl %1,%0"
:"=m" (v->counter)
:"ir" (i), "m" (v->counter));
}
unsigned char c;
__asm__ __volatile__(
- LOCK "subl %2,%0; sete %1"
+ LOCK_PREFIX "subl %2,%0; sete %1"
:"=m" (v->counter), "=qm" (c)
:"ir" (i), "m" (v->counter) : "memory");
return c;
static __inline__ void atomic_inc(atomic_t *v)
{
__asm__ __volatile__(
- LOCK "incl %0"
+ LOCK_PREFIX "incl %0"
:"=m" (v->counter)
:"m" (v->counter));
}
static __inline__ void atomic_dec(atomic_t *v)
{
__asm__ __volatile__(
- LOCK "decl %0"
+ LOCK_PREFIX "decl %0"
:"=m" (v->counter)
:"m" (v->counter));
}
unsigned char c;
__asm__ __volatile__(
- LOCK "decl %0; sete %1"
+ LOCK_PREFIX "decl %0; sete %1"
:"=m" (v->counter), "=qm" (c)
:"m" (v->counter) : "memory");
return c != 0;
unsigned char c;
__asm__ __volatile__(
- LOCK "incl %0; sete %1"
+ 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
- * @v: pointer of type atomic_t
* @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
unsigned char c;
__asm__ __volatile__(
- LOCK "addl %2,%0; sets %1"
+ 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 "andl %0,%1" \
+__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \
: : "r" (~(mask)),"m" (*addr) : "memory")
#define atomic_set_mask(mask, addr) \
-__asm__ __volatile__(LOCK "orl %0,%1" \
+__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_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif
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