2008-10-22 23:26:29 -06:00
|
|
|
#ifndef _ASM_X86_ATOMIC_32_H
|
|
|
|
#define _ASM_X86_ATOMIC_32_H
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
#include <linux/compiler.h>
|
2009-01-06 15:40:39 -07:00
|
|
|
#include <linux/types.h>
|
2005-04-16 16:20:36 -06:00
|
|
|
#include <asm/processor.h>
|
2007-05-08 01:35:02 -06:00
|
|
|
#include <asm/cmpxchg.h>
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Atomic operations that C can't guarantee us. Useful for
|
|
|
|
* resource counting etc..
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_read - read atomic variable
|
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically reads the value of @v.
|
2008-03-23 02:01:41 -06:00
|
|
|
*/
|
2009-07-03 05:06:01 -06:00
|
|
|
static inline int atomic_read(const atomic_t *v)
|
|
|
|
{
|
|
|
|
return v->counter;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_set - set atomic variable
|
|
|
|
* @v: pointer of type atomic_t
|
|
|
|
* @i: required value
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically sets the value of @v to @i.
|
2008-03-23 02:01:41 -06:00
|
|
|
*/
|
|
|
|
#define atomic_set(v, i) (((v)->counter) = (i))
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_add - add integer to atomic variable
|
|
|
|
* @i: integer value to add
|
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically adds @i to @v.
|
|
|
|
*/
|
2008-03-23 02:01:41 -06:00
|
|
|
static inline void atomic_add(int i, atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "addl %1,%0"
|
|
|
|
: "+m" (v->counter)
|
|
|
|
: "ir" (i));
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2007-05-08 01:35:08 -06:00
|
|
|
* atomic_sub - subtract integer from atomic variable
|
2005-04-16 16:20:36 -06:00
|
|
|
* @i: integer value to subtract
|
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically subtracts @i from @v.
|
|
|
|
*/
|
2008-03-23 02:01:41 -06:00
|
|
|
static inline void atomic_sub(int i, atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "subl %1,%0"
|
|
|
|
: "+m" (v->counter)
|
|
|
|
: "ir" (i));
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_sub_and_test - subtract value from variable and test result
|
|
|
|
* @i: integer value to subtract
|
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically subtracts @i from @v and returns
|
|
|
|
* true if the result is zero, or false for all
|
|
|
|
* other cases.
|
|
|
|
*/
|
2008-03-23 02:01:41 -06:00
|
|
|
static inline int atomic_sub_and_test(int i, atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
unsigned char c;
|
|
|
|
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "subl %2,%0; sete %1"
|
|
|
|
: "+m" (v->counter), "=qm" (c)
|
|
|
|
: "ir" (i) : "memory");
|
2005-04-16 16:20:36 -06:00
|
|
|
return c;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_inc - increment atomic variable
|
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically increments @v by 1.
|
2008-03-23 02:01:41 -06:00
|
|
|
*/
|
|
|
|
static inline void atomic_inc(atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "incl %0"
|
|
|
|
: "+m" (v->counter));
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_dec - decrement atomic variable
|
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically decrements @v by 1.
|
2008-03-23 02:01:41 -06:00
|
|
|
*/
|
|
|
|
static inline void atomic_dec(atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "decl %0"
|
|
|
|
: "+m" (v->counter));
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_dec_and_test - decrement and test
|
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically decrements @v by 1 and
|
|
|
|
* returns true if the result is 0, or false for all other
|
|
|
|
* cases.
|
2008-03-23 02:01:41 -06:00
|
|
|
*/
|
|
|
|
static inline int atomic_dec_and_test(atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
unsigned char c;
|
|
|
|
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "decl %0; sete %1"
|
|
|
|
: "+m" (v->counter), "=qm" (c)
|
|
|
|
: : "memory");
|
2005-04-16 16:20:36 -06:00
|
|
|
return c != 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2008-03-23 02:01:41 -06:00
|
|
|
* atomic_inc_and_test - increment and test
|
2005-04-16 16:20:36 -06:00
|
|
|
* @v: pointer of type atomic_t
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically increments @v by 1
|
|
|
|
* and returns true if the result is zero, or false for all
|
|
|
|
* other cases.
|
2008-03-23 02:01:41 -06:00
|
|
|
*/
|
|
|
|
static inline int atomic_inc_and_test(atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
unsigned char c;
|
|
|
|
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "incl %0; sete %1"
|
|
|
|
: "+m" (v->counter), "=qm" (c)
|
|
|
|
: : "memory");
|
2005-04-16 16:20:36 -06:00
|
|
|
return c != 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic_add_negative - add and test if negative
|
|
|
|
* @v: pointer of type atomic_t
|
|
|
|
* @i: integer value to add
|
2008-03-23 02:01:41 -06:00
|
|
|
*
|
2005-04-16 16:20:36 -06:00
|
|
|
* Atomically adds @i to @v and returns true
|
|
|
|
* if the result is negative, or false when
|
|
|
|
* result is greater than or equal to zero.
|
2008-03-23 02:01:41 -06:00
|
|
|
*/
|
|
|
|
static inline int atomic_add_negative(int i, atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
unsigned char c;
|
|
|
|
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "addl %2,%0; sets %1"
|
|
|
|
: "+m" (v->counter), "=qm" (c)
|
|
|
|
: "ir" (i) : "memory");
|
2005-04-16 16:20:36 -06:00
|
|
|
return c;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2007-05-08 01:35:08 -06:00
|
|
|
* atomic_add_return - add integer and return
|
2005-04-16 16:20:36 -06:00
|
|
|
* @v: pointer of type atomic_t
|
|
|
|
* @i: integer value to add
|
|
|
|
*
|
|
|
|
* Atomically adds @i to @v and returns @i + @v
|
|
|
|
*/
|
2008-03-23 02:01:41 -06:00
|
|
|
static inline int atomic_add_return(int i, atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int __i;
|
|
|
|
#ifdef CONFIG_M386
|
2006-04-18 23:21:10 -06:00
|
|
|
unsigned long flags;
|
2008-03-23 02:01:41 -06:00
|
|
|
if (unlikely(boot_cpu_data.x86 <= 3))
|
2005-04-16 16:20:36 -06:00
|
|
|
goto no_xadd;
|
|
|
|
#endif
|
|
|
|
/* Modern 486+ processor */
|
|
|
|
__i = i;
|
2008-03-23 02:01:41 -06:00
|
|
|
asm volatile(LOCK_PREFIX "xaddl %0, %1"
|
|
|
|
: "+r" (i), "+m" (v->counter)
|
|
|
|
: : "memory");
|
2005-04-16 16:20:36 -06:00
|
|
|
return i + __i;
|
|
|
|
|
|
|
|
#ifdef CONFIG_M386
|
|
|
|
no_xadd: /* Legacy 386 processor */
|
2006-04-18 23:21:10 -06:00
|
|
|
local_irq_save(flags);
|
2005-04-16 16:20:36 -06:00
|
|
|
__i = atomic_read(v);
|
|
|
|
atomic_set(v, i + __i);
|
2006-04-18 23:21:10 -06:00
|
|
|
local_irq_restore(flags);
|
2005-04-16 16:20:36 -06:00
|
|
|
return i + __i;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2007-05-08 01:35:08 -06:00
|
|
|
/**
|
|
|
|
* atomic_sub_return - subtract integer and return
|
|
|
|
* @v: pointer of type atomic_t
|
|
|
|
* @i: integer value to subtract
|
|
|
|
*
|
|
|
|
* Atomically subtracts @i from @v and returns @v - @i
|
|
|
|
*/
|
2008-03-23 02:01:41 -06:00
|
|
|
static inline int atomic_sub_return(int i, atomic_t *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-03-23 02:01:41 -06:00
|
|
|
return atomic_add_return(-i, v);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2007-05-08 01:34:20 -06:00
|
|
|
#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
|
|
|
|
#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
|
2005-11-13 17:07:24 -07:00
|
|
|
|
2005-11-13 17:07:25 -07:00
|
|
|
/**
|
2007-02-10 02:45:59 -07:00
|
|
|
* atomic_add_unless - add unless the number is already a given value
|
2005-11-13 17:07:25 -07:00
|
|
|
* @v: pointer of type atomic_t
|
|
|
|
* @a: the amount to add to v...
|
|
|
|
* @u: ...unless v is equal to u.
|
|
|
|
*
|
2007-02-10 02:45:59 -07:00
|
|
|
* Atomically adds @a to @v, so long as @v was not already @u.
|
2005-11-13 17:07:25 -07:00
|
|
|
* Returns non-zero if @v was not @u, and zero otherwise.
|
|
|
|
*/
|
2008-03-23 02:01:41 -06:00
|
|
|
static inline int atomic_add_unless(atomic_t *v, int a, int u)
|
2007-05-08 01:34:38 -06:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
return c != (u);
|
|
|
|
}
|
|
|
|
|
2005-11-13 17:07:25 -07:00
|
|
|
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
|
|
|
|
2008-03-23 02:01:41 -06:00
|
|
|
#define atomic_inc_return(v) (atomic_add_return(1, v))
|
|
|
|
#define atomic_dec_return(v) (atomic_sub_return(1, v))
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* These are x86-specific, used by some header files */
|
2008-03-23 02:01:41 -06:00
|
|
|
#define atomic_clear_mask(mask, addr) \
|
|
|
|
asm volatile(LOCK_PREFIX "andl %0,%1" \
|
|
|
|
: : "r" (~(mask)), "m" (*(addr)) : "memory")
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-03-23 02:01:41 -06:00
|
|
|
#define atomic_set_mask(mask, addr) \
|
|
|
|
asm volatile(LOCK_PREFIX "orl %0,%1" \
|
|
|
|
: : "r" (mask), "m" (*(addr)) : "memory")
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* 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()
|
|
|
|
|
2008-12-14 12:22:35 -07:00
|
|
|
/* An 64bit atomic type */
|
|
|
|
|
|
|
|
typedef struct {
|
2009-07-03 05:26:39 -06:00
|
|
|
u64 __aligned(8) counter;
|
2008-12-14 12:22:35 -07:00
|
|
|
} atomic64_t;
|
|
|
|
|
|
|
|
#define ATOMIC64_INIT(val) { (val) }
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_read - read atomic64 variable
|
2009-06-13 21:00:54 -06:00
|
|
|
* @ptr: pointer of type atomic64_t
|
2008-12-14 12:22:35 -07:00
|
|
|
*
|
|
|
|
* Atomically reads the value of @v.
|
|
|
|
* Doesn't imply a read memory barrier.
|
|
|
|
*/
|
|
|
|
#define __atomic64_read(ptr) ((ptr)->counter)
|
|
|
|
|
2009-07-03 05:26:39 -06:00
|
|
|
extern u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old_val, u64 new_val);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
2009-04-07 03:30:17 -06:00
|
|
|
* atomic64_xchg - xchg atomic64 variable
|
2008-12-14 12:22:35 -07:00
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
* @new_val: value to assign
|
|
|
|
*
|
2009-04-07 03:30:17 -06:00
|
|
|
* Atomically xchgs the value of @ptr to @new_val and returns
|
|
|
|
* the old value.
|
2008-12-14 12:22:35 -07:00
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern u64 atomic64_xchg(atomic64_t *ptr, u64 new_val);
|
2009-04-07 03:30:17 -06:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_set - set atomic64 variable
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
* @new_val: value to assign
|
|
|
|
*
|
|
|
|
* Atomically sets the value of @ptr to @new_val.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern void atomic64_set(atomic64_t *ptr, u64 new_val);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_read - read atomic64 variable
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically reads the value of @ptr and returns it.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern u64 atomic64_read(atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_add_return - add and return
|
|
|
|
* @delta: integer value to add
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically adds @delta to @ptr and returns @delta + *@ptr
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern u64 atomic64_add_return(u64 delta, atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
2009-07-03 05:26:39 -06:00
|
|
|
/*
|
|
|
|
* Other variants with different arithmetic operators:
|
|
|
|
*/
|
|
|
|
extern u64 atomic64_sub_return(u64 delta, atomic64_t *ptr);
|
|
|
|
extern u64 atomic64_inc_return(atomic64_t *ptr);
|
|
|
|
extern u64 atomic64_dec_return(atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_add - add integer to atomic64 variable
|
|
|
|
* @delta: integer value to add
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically adds @delta to @ptr.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern void atomic64_add(u64 delta, atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_sub - subtract the atomic64 variable
|
|
|
|
* @delta: integer value to subtract
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically subtracts @delta from @ptr.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern void atomic64_sub(u64 delta, atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_sub_and_test - subtract value from variable and test result
|
|
|
|
* @delta: integer value to subtract
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically subtracts @delta from @ptr and returns
|
|
|
|
* true if the result is zero, or false for all
|
|
|
|
* other cases.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern int atomic64_sub_and_test(u64 delta, atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_inc - increment atomic64 variable
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically increments @ptr by 1.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern void atomic64_inc(atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_dec - decrement atomic64 variable
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically decrements @ptr by 1.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern void atomic64_dec(atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_dec_and_test - decrement and test
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically decrements @ptr by 1 and
|
|
|
|
* returns true if the result is 0, or false for all other
|
|
|
|
* cases.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern int atomic64_dec_and_test(atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_inc_and_test - increment and test
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically increments @ptr by 1
|
|
|
|
* and returns true if the result is zero, or false for all
|
|
|
|
* other cases.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern int atomic64_inc_and_test(atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_add_negative - add and test if negative
|
|
|
|
* @delta: integer value to add
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically adds @delta to @ptr and returns true
|
|
|
|
* if the result is negative, or false when
|
|
|
|
* result is greater than or equal to zero.
|
|
|
|
*/
|
2009-07-03 05:26:39 -06:00
|
|
|
extern int atomic64_add_negative(u64 delta, atomic64_t *ptr);
|
2008-12-14 12:22:35 -07:00
|
|
|
|
2009-05-13 16:56:29 -06:00
|
|
|
#include <asm-generic/atomic-long.h>
|
2008-10-22 23:26:29 -06:00
|
|
|
#endif /* _ASM_X86_ATOMIC_32_H */
|