x86: Merge asm/atomic_{32,64}.h
Merge the now identical code from asm/atomic_32.h and asm/atomic_64.h into asm/atomic.h. Signed-off-by: Brian Gerst <brgerst@gmail.com> LKML-Reference: <1262883215-4034-4-git-send-email-brgerst@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Brian Gerst
H. Peter Anvin
parent
3ce59bb835
commit
5abbbbf0b0
|
|
@ -1,5 +1,300 @@
|
|||
#ifdef CONFIG_X86_32
|
||||
# include "atomic_32.h"
|
||||
#else
|
||||
# include "atomic_64.h"
|
||||
#ifndef _ASM_X86_ATOMIC_H
|
||||
#define _ASM_X86_ATOMIC_H
|
||||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/types.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/alternative.h>
|
||||
#include <asm/cmpxchg.h>
|
||||
|
||||
/*
|
||||
* 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
|
||||
*
|
||||
* Atomically reads the value of @v.
|
||||
*/
|
||||
static inline int atomic_read(const atomic_t *v)
|
||||
{
|
||||
return v->counter;
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_set - set atomic variable
|
||||
* @v: pointer of type atomic_t
|
||||
* @i: required value
|
||||
*
|
||||
* Atomically sets the value of @v to @i.
|
||||
*/
|
||||
static inline void atomic_set(atomic_t *v, int 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_sub - subtract integer from 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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) : "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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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)
|
||||
: : "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)
|
||||
: : "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) : "memory");
|
||||
return c;
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_add_return - add integer 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;
|
||||
#ifdef CONFIG_M386
|
||||
unsigned long flags;
|
||||
if (unlikely(boot_cpu_data.x86 <= 3))
|
||||
goto no_xadd;
|
||||
#endif
|
||||
/* Modern 486+ processor */
|
||||
__i = i;
|
||||
asm volatile(LOCK_PREFIX "xaddl %0, %1"
|
||||
: "+r" (i), "+m" (v->counter)
|
||||
: : "memory");
|
||||
return i + __i;
|
||||
|
||||
#ifdef CONFIG_M386
|
||||
no_xadd: /* Legacy 386 processor */
|
||||
local_irq_save(flags);
|
||||
__i = atomic_read(v);
|
||||
atomic_set(v, i + __i);
|
||||
local_irq_restore(flags);
|
||||
return i + __i;
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* 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
|
||||
*/
|
||||
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))
|
||||
|
||||
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
|
||||
{
|
||||
return cmpxchg(&v->counter, old, new);
|
||||
}
|
||||
|
||||
static inline int atomic_xchg(atomic_t *v, int new)
|
||||
{
|
||||
return xchg(&v->counter, new);
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_add_unless - add unless the number is already 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 @v was not already @u.
|
||||
* Returns non-zero if @v was not @u, and zero otherwise.
|
||||
*/
|
||||
static inline int atomic_add_unless(atomic_t *v, int a, int 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;
|
||||
}
|
||||
return c != (u);
|
||||
}
|
||||
|
||||
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
||||
|
||||
/**
|
||||
* atomic_inc_short - increment of a short integer
|
||||
* @v: pointer to type int
|
||||
*
|
||||
* Atomically adds 1 to @v
|
||||
* Returns the new value of @u
|
||||
*/
|
||||
static inline short int atomic_inc_short(short int *v)
|
||||
{
|
||||
asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
|
||||
return *v;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/**
|
||||
* atomic_or_long - OR of two long integers
|
||||
* @v1: pointer to type unsigned long
|
||||
* @v2: pointer to type unsigned long
|
||||
*
|
||||
* Atomically ORs @v1 and @v2
|
||||
* Returns the result of the OR
|
||||
*/
|
||||
static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
|
||||
{
|
||||
asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));
|
||||
}
|
||||
#endif
|
||||
|
||||
/* 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()
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
# include "atomic64_32.h"
|
||||
#else
|
||||
# include "atomic64_64.h"
|
||||
#endif
|
||||
|
||||
#include <asm-generic/atomic-long.h>
|
||||
#endif /* _ASM_X86_ATOMIC_H */
|
||||
|
|
|
|||
|
|
@ -1,295 +0,0 @@
|
|||
#ifndef _ASM_X86_ATOMIC_32_H
|
||||
#define _ASM_X86_ATOMIC_32_H
|
||||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/types.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/alternative.h>
|
||||
#include <asm/cmpxchg.h>
|
||||
|
||||
/*
|
||||
* 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
|
||||
*
|
||||
* Atomically reads the value of @v.
|
||||
*/
|
||||
static inline int atomic_read(const atomic_t *v)
|
||||
{
|
||||
return v->counter;
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_set - set atomic variable
|
||||
* @v: pointer of type atomic_t
|
||||
* @i: required value
|
||||
*
|
||||
* Atomically sets the value of @v to @i.
|
||||
*/
|
||||
static inline void atomic_set(atomic_t *v, int 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_sub - subtract integer from 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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) : "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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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)
|
||||
: : "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)
|
||||
: : "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) : "memory");
|
||||
return c;
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_add_return - add integer 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;
|
||||
#ifdef CONFIG_M386
|
||||
unsigned long flags;
|
||||
if (unlikely(boot_cpu_data.x86 <= 3))
|
||||
goto no_xadd;
|
||||
#endif
|
||||
/* Modern 486+ processor */
|
||||
__i = i;
|
||||
asm volatile(LOCK_PREFIX "xaddl %0, %1"
|
||||
: "+r" (i), "+m" (v->counter)
|
||||
: : "memory");
|
||||
return i + __i;
|
||||
|
||||
#ifdef CONFIG_M386
|
||||
no_xadd: /* Legacy 386 processor */
|
||||
local_irq_save(flags);
|
||||
__i = atomic_read(v);
|
||||
atomic_set(v, i + __i);
|
||||
local_irq_restore(flags);
|
||||
return i + __i;
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* 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
|
||||
*/
|
||||
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))
|
||||
|
||||
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
|
||||
{
|
||||
return cmpxchg(&v->counter, old, new);
|
||||
}
|
||||
|
||||
static inline int atomic_xchg(atomic_t *v, int new)
|
||||
{
|
||||
return xchg(&v->counter, new);
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_add_unless - add unless the number is already 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 @v was not already @u.
|
||||
* Returns non-zero if @v was not @u, and zero otherwise.
|
||||
*/
|
||||
static inline int atomic_add_unless(atomic_t *v, int a, int 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;
|
||||
}
|
||||
return c != (u);
|
||||
}
|
||||
|
||||
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
||||
|
||||
/**
|
||||
* atomic_inc_short - increment of a short integer
|
||||
* @v: pointer to type int
|
||||
*
|
||||
* Atomically adds 1 to @v
|
||||
* Returns the new value of @u
|
||||
*/
|
||||
static inline short int atomic_inc_short(short int *v)
|
||||
{
|
||||
asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
|
||||
return *v;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/**
|
||||
* atomic_or_long - OR of two long integers
|
||||
* @v1: pointer to type unsigned long
|
||||
* @v2: pointer to type unsigned long
|
||||
*
|
||||
* Atomically ORs @v1 and @v2
|
||||
* Returns the result of the OR
|
||||
*/
|
||||
static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
|
||||
{
|
||||
asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));
|
||||
}
|
||||
#endif
|
||||
|
||||
/* 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/atomic64_32.h>
|
||||
#include <asm-generic/atomic-long.h>
|
||||
#endif /* _ASM_X86_ATOMIC_32_H */
|
||||
|
|
@ -1,295 +0,0 @@
|
|||
#ifndef _ASM_X86_ATOMIC_64_H
|
||||
#define _ASM_X86_ATOMIC_64_H
|
||||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/types.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/alternative.h>
|
||||
#include <asm/cmpxchg.h>
|
||||
|
||||
/*
|
||||
* 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
|
||||
*
|
||||
* Atomically reads the value of @v.
|
||||
*/
|
||||
static inline int atomic_read(const atomic_t *v)
|
||||
{
|
||||
return v->counter;
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_set - set atomic variable
|
||||
* @v: pointer of type atomic_t
|
||||
* @i: required value
|
||||
*
|
||||
* Atomically sets the value of @v to @i.
|
||||
*/
|
||||
static inline void atomic_set(atomic_t *v, int 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_sub - subtract integer from 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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) : "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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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));
|
||||
}
|
||||
|
||||
/**
|
||||
* 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)
|
||||
: : "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)
|
||||
: : "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) : "memory");
|
||||
return c;
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_add_return - add integer 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;
|
||||
#ifdef CONFIG_M386
|
||||
unsigned long flags;
|
||||
if (unlikely(boot_cpu_data.x86 <= 3))
|
||||
goto no_xadd;
|
||||
#endif
|
||||
/* Modern 486+ processor */
|
||||
__i = i;
|
||||
asm volatile(LOCK_PREFIX "xaddl %0, %1"
|
||||
: "+r" (i), "+m" (v->counter)
|
||||
: : "memory");
|
||||
return i + __i;
|
||||
|
||||
#ifdef CONFIG_M386
|
||||
no_xadd: /* Legacy 386 processor */
|
||||
local_irq_save(flags);
|
||||
__i = atomic_read(v);
|
||||
atomic_set(v, i + __i);
|
||||
local_irq_restore(flags);
|
||||
return i + __i;
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* 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
|
||||
*/
|
||||
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))
|
||||
|
||||
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
|
||||
{
|
||||
return cmpxchg(&v->counter, old, new);
|
||||
}
|
||||
|
||||
static inline int atomic_xchg(atomic_t *v, int new)
|
||||
{
|
||||
return xchg(&v->counter, new);
|
||||
}
|
||||
|
||||
/**
|
||||
* atomic_add_unless - add unless the number is already 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 @v was not already @u.
|
||||
* Returns non-zero if @v was not @u, and zero otherwise.
|
||||
*/
|
||||
static inline int atomic_add_unless(atomic_t *v, int a, int 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;
|
||||
}
|
||||
return c != (u);
|
||||
}
|
||||
|
||||
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
||||
|
||||
/**
|
||||
* atomic_inc_short - increment of a short integer
|
||||
* @v: pointer to type int
|
||||
*
|
||||
* Atomically adds 1 to @v
|
||||
* Returns the new value of @u
|
||||
*/
|
||||
static inline short int atomic_inc_short(short int *v)
|
||||
{
|
||||
asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
|
||||
return *v;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/**
|
||||
* atomic_or_long - OR of two long integers
|
||||
* @v1: pointer to type unsigned long
|
||||
* @v2: pointer to type unsigned long
|
||||
*
|
||||
* Atomically ORs @v1 and @v2
|
||||
* Returns the result of the OR
|
||||
*/
|
||||
static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
|
||||
{
|
||||
asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));
|
||||
}
|
||||
#endif
|
||||
|
||||
/* 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/atomic64_64.h>
|
||||
#include <asm-generic/atomic-long.h>
|
||||
#endif /* _ASM_X86_ATOMIC_64_H */
|
||||
Loading…
Reference in New Issue