2008-10-22 23:26:29 -06:00
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#ifndef _ASM_X86_ATOMIC_32_H
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#define _ASM_X86_ATOMIC_32_H
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2005-04-16 16:20:36 -06:00
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#include <linux/compiler.h>
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2009-01-06 15:40:39 -07:00
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#include <linux/types.h>
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#include <asm/processor.h>
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#include <asm/cmpxchg.h>
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2005-04-16 16:20:36 -06:00
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*/
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#define ATOMIC_INIT(i) { (i) }
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/**
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* atomic_read - read atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically reads the value of @v.
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*/
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#define atomic_read(v) ((v)->counter)
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/**
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* atomic_set - set atomic variable
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* @v: pointer of type atomic_t
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* @i: required value
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*
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* Atomically sets the value of @v to @i.
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*/
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#define atomic_set(v, i) (((v)->counter) = (i))
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/**
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* atomic_add - add integer to atomic variable
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* @i: integer value to add
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* @v: pointer of type atomic_t
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*
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* Atomically adds @i to @v.
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*/
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static inline void atomic_add(int i, atomic_t *v)
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{
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asm volatile(LOCK_PREFIX "addl %1,%0"
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: "+m" (v->counter)
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: "ir" (i));
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}
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/**
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* atomic_sub - subtract integer from atomic variable
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* @i: integer value to subtract
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* @v: pointer of type atomic_t
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*
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* Atomically subtracts @i from @v.
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*/
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static inline void atomic_sub(int i, atomic_t *v)
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{
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asm volatile(LOCK_PREFIX "subl %1,%0"
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: "+m" (v->counter)
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: "ir" (i));
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}
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/**
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* atomic_sub_and_test - subtract value from variable and test result
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* @i: integer value to subtract
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* @v: pointer of type atomic_t
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*
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* Atomically subtracts @i from @v and returns
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* true if the result is zero, or false for all
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* other cases.
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*/
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static inline int atomic_sub_and_test(int i, atomic_t *v)
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{
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unsigned char c;
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2008-03-23 02:01:41 -06:00
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asm volatile(LOCK_PREFIX "subl %2,%0; sete %1"
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: "+m" (v->counter), "=qm" (c)
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: "ir" (i) : "memory");
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return c;
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}
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/**
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* atomic_inc - increment atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1.
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*/
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static inline void atomic_inc(atomic_t *v)
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{
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asm volatile(LOCK_PREFIX "incl %0"
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: "+m" (v->counter));
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2005-04-16 16:20:36 -06:00
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}
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/**
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* atomic_dec - decrement atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically decrements @v by 1.
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*/
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static inline void atomic_dec(atomic_t *v)
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{
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asm volatile(LOCK_PREFIX "decl %0"
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: "+m" (v->counter));
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}
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/**
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* atomic_dec_and_test - decrement and test
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* @v: pointer of type atomic_t
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*
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* Atomically decrements @v by 1 and
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* returns true if the result is 0, or false for all other
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* cases.
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2008-03-23 02:01:41 -06:00
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*/
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static inline int atomic_dec_and_test(atomic_t *v)
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{
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unsigned char c;
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2008-03-23 02:01:41 -06:00
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asm volatile(LOCK_PREFIX "decl %0; sete %1"
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: "+m" (v->counter), "=qm" (c)
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: : "memory");
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2005-04-16 16:20:36 -06:00
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return c != 0;
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}
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/**
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2008-03-23 02:01:41 -06:00
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* atomic_inc_and_test - increment and test
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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2008-03-23 02:01:41 -06:00
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*/
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static inline int atomic_inc_and_test(atomic_t *v)
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{
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unsigned char c;
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2008-03-23 02:01:41 -06:00
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asm volatile(LOCK_PREFIX "incl %0; sete %1"
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: "+m" (v->counter), "=qm" (c)
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: : "memory");
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2005-04-16 16:20:36 -06:00
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return c != 0;
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}
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/**
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* atomic_add_negative - add and test if negative
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* @v: pointer of type atomic_t
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* @i: integer value to add
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*
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* Atomically adds @i to @v and returns true
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* if the result is negative, or false when
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* result is greater than or equal to zero.
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*/
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static inline int atomic_add_negative(int i, atomic_t *v)
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{
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unsigned char c;
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2008-03-23 02:01:41 -06:00
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asm volatile(LOCK_PREFIX "addl %2,%0; sets %1"
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: "+m" (v->counter), "=qm" (c)
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: "ir" (i) : "memory");
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2005-04-16 16:20:36 -06:00
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return c;
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}
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/**
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2007-05-08 01:35:08 -06:00
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* atomic_add_return - add integer and return
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* @v: pointer of type atomic_t
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* @i: integer value to add
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*
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* Atomically adds @i to @v and returns @i + @v
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*/
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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int __i;
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#ifdef CONFIG_M386
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2006-04-18 23:21:10 -06:00
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unsigned long flags;
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if (unlikely(boot_cpu_data.x86 <= 3))
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goto no_xadd;
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#endif
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/* Modern 486+ processor */
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__i = i;
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2008-03-23 02:01:41 -06:00
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asm volatile(LOCK_PREFIX "xaddl %0, %1"
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: "+r" (i), "+m" (v->counter)
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: : "memory");
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2005-04-16 16:20:36 -06:00
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return i + __i;
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#ifdef CONFIG_M386
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no_xadd: /* Legacy 386 processor */
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2006-04-18 23:21:10 -06:00
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local_irq_save(flags);
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2005-04-16 16:20:36 -06:00
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__i = atomic_read(v);
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atomic_set(v, i + __i);
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2006-04-18 23:21:10 -06:00
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local_irq_restore(flags);
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2005-04-16 16:20:36 -06:00
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return i + __i;
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#endif
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}
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2007-05-08 01:35:08 -06:00
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/**
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* atomic_sub_return - subtract integer and return
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* @v: pointer of type atomic_t
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* @i: integer value to subtract
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*
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* Atomically subtracts @i from @v and returns @v - @i
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*/
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2008-03-23 02:01:41 -06:00
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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2008-03-23 02:01:41 -06:00
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return atomic_add_return(-i, v);
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2005-04-16 16:20:36 -06:00
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}
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2007-05-08 01:34:20 -06:00
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#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
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#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
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2005-11-13 17:07:24 -07:00
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2005-11-13 17:07:25 -07:00
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/**
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2007-02-10 02:45:59 -07:00
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* atomic_add_unless - add unless the number is already a given value
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2005-11-13 17:07:25 -07:00
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* @v: pointer of type atomic_t
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* @a: the amount to add to v...
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* @u: ...unless v is equal to u.
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*
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2007-02-10 02:45:59 -07:00
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* Atomically adds @a to @v, so long as @v was not already @u.
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2005-11-13 17:07:25 -07:00
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* Returns non-zero if @v was not @u, and zero otherwise.
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*/
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2008-03-23 02:01:41 -06:00
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static inline int atomic_add_unless(atomic_t *v, int a, int u)
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2007-05-08 01:34:38 -06:00
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{
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int c, old;
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c = atomic_read(v);
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for (;;) {
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if (unlikely(c == (u)))
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break;
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old = atomic_cmpxchg((v), c, c + (a));
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if (likely(old == c))
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break;
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c = old;
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}
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return c != (u);
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}
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2005-11-13 17:07:25 -07:00
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#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
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2008-03-23 02:01:41 -06:00
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#define atomic_inc_return(v) (atomic_add_return(1, v))
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#define atomic_dec_return(v) (atomic_sub_return(1, v))
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2005-04-16 16:20:36 -06:00
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/* These are x86-specific, used by some header files */
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2008-03-23 02:01:41 -06:00
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#define atomic_clear_mask(mask, addr) \
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asm volatile(LOCK_PREFIX "andl %0,%1" \
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: : "r" (~(mask)), "m" (*(addr)) : "memory")
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2005-04-16 16:20:36 -06:00
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2008-03-23 02:01:41 -06:00
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#define atomic_set_mask(mask, addr) \
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asm volatile(LOCK_PREFIX "orl %0,%1" \
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: : "r" (mask), "m" (*(addr)) : "memory")
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2005-04-16 16:20:36 -06:00
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/* Atomic operations are already serializing on x86 */
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#define smp_mb__before_atomic_dec() barrier()
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#define smp_mb__after_atomic_dec() barrier()
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#define smp_mb__before_atomic_inc() barrier()
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#define smp_mb__after_atomic_inc() barrier()
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2008-12-14 12:22:35 -07:00
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/* An 64bit atomic type */
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typedef struct {
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unsigned long long counter;
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} atomic64_t;
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#define ATOMIC64_INIT(val) { (val) }
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/**
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* atomic64_read - read atomic64 variable
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2009-06-13 21:00:54 -06:00
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* @ptr: pointer of type atomic64_t
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2008-12-14 12:22:35 -07:00
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*
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* Atomically reads the value of @v.
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* Doesn't imply a read memory barrier.
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*/
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#define __atomic64_read(ptr) ((ptr)->counter)
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static inline unsigned long long
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cmpxchg8b(unsigned long long *ptr, unsigned long long old, unsigned long long new)
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{
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asm volatile(
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LOCK_PREFIX "cmpxchg8b (%[ptr])\n"
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: "=A" (old)
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: [ptr] "D" (ptr),
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"A" (old),
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"b" (ll_low(new)),
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"c" (ll_high(new))
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: "memory");
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return old;
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}
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static inline unsigned long long
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atomic64_cmpxchg(atomic64_t *ptr, unsigned long long old_val,
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unsigned long long new_val)
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{
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return cmpxchg8b(&ptr->counter, old_val, new_val);
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}
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/**
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2009-04-07 03:30:17 -06:00
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* atomic64_xchg - xchg atomic64 variable
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2008-12-14 12:22:35 -07:00
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* @ptr: pointer to type atomic64_t
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* @new_val: value to assign
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*
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2009-04-07 03:30:17 -06:00
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* Atomically xchgs the value of @ptr to @new_val and returns
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* the old value.
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2008-12-14 12:22:35 -07:00
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*/
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2009-04-07 03:30:17 -06:00
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static inline unsigned long long
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atomic64_xchg(atomic64_t *ptr, unsigned long long new_val)
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2008-12-14 12:22:35 -07:00
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{
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unsigned long long old_val;
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do {
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old_val = atomic_read(ptr);
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} while (atomic64_cmpxchg(ptr, old_val, new_val) != old_val);
|
2009-04-07 03:30:17 -06:00
|
|
|
|
|
|
|
return old_val;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
static inline void atomic64_set(atomic64_t *ptr, unsigned long long new_val)
|
|
|
|
{
|
|
|
|
atomic64_xchg(ptr, 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.
|
|
|
|
*/
|
|
|
|
static inline unsigned long long atomic64_read(atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
unsigned long long curr_val;
|
|
|
|
|
|
|
|
do {
|
|
|
|
curr_val = __atomic64_read(ptr);
|
|
|
|
} while (atomic64_cmpxchg(ptr, curr_val, curr_val) != curr_val);
|
|
|
|
|
|
|
|
return curr_val;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
*/
|
|
|
|
static inline unsigned long long
|
|
|
|
atomic64_add_return(unsigned long long delta, atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
unsigned long long old_val, new_val;
|
|
|
|
|
|
|
|
do {
|
|
|
|
old_val = atomic_read(ptr);
|
|
|
|
new_val = old_val + delta;
|
|
|
|
|
|
|
|
} while (atomic64_cmpxchg(ptr, old_val, new_val) != old_val);
|
|
|
|
|
|
|
|
return new_val;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline long atomic64_sub_return(unsigned long long delta, atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
return atomic64_add_return(-delta, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline long atomic64_inc_return(atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
return atomic64_add_return(1, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline long atomic64_dec_return(atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
return atomic64_sub_return(1, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_add - add integer to atomic64 variable
|
|
|
|
* @delta: integer value to add
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically adds @delta to @ptr.
|
|
|
|
*/
|
|
|
|
static inline void atomic64_add(unsigned long long delta, atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
atomic64_add_return(delta, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_sub - subtract the atomic64 variable
|
|
|
|
* @delta: integer value to subtract
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically subtracts @delta from @ptr.
|
|
|
|
*/
|
|
|
|
static inline void atomic64_sub(unsigned long long delta, atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
atomic64_add(-delta, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
static inline int
|
|
|
|
atomic64_sub_and_test(unsigned long long delta, atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
unsigned long long old_val = atomic64_sub_return(delta, ptr);
|
|
|
|
|
|
|
|
return old_val == 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_inc - increment atomic64 variable
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically increments @ptr by 1.
|
|
|
|
*/
|
|
|
|
static inline void atomic64_inc(atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
atomic64_add(1, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* atomic64_dec - decrement atomic64 variable
|
|
|
|
* @ptr: pointer to type atomic64_t
|
|
|
|
*
|
|
|
|
* Atomically decrements @ptr by 1.
|
|
|
|
*/
|
|
|
|
static inline void atomic64_dec(atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
atomic64_sub(1, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
static inline int atomic64_dec_and_test(atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
return atomic64_sub_and_test(1, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
static inline int atomic64_inc_and_test(atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
return atomic64_sub_and_test(-1, ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
static inline int
|
|
|
|
atomic64_add_negative(unsigned long long delta, atomic64_t *ptr)
|
|
|
|
{
|
|
|
|
long long old_val = atomic64_add_return(delta, ptr);
|
|
|
|
|
|
|
|
return old_val < 0;
|
|
|
|
}
|
|
|
|
|
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 */
|