litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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0400 committer Ingo Molnar <mingo@elte.hu> 2008-04-17 11:41:21 -0400 include/asm-x86/atomic_32.h: checkpatch cleanups - formatting only' href='/cgit/cgit.cgi/litmus-rt-budgetable-locks.git/.git/commit/include/asm-x86/atomic_32.h?h=update_litmus_2019&id=78ff12eec42a4141d22dac4fdab04994384f6385'>78ff12eec42a

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#ifndef __ARCH_I386_ATOMIC__
#define __ARCH_I386_ATOMIC__

#include <linux/compiler.h>
#include <asm/processor.h>
#include <asm/cmpxchg.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */

/*
 * 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));
}

/**
 * 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
 * @v: pointer of type atomic_t
 * @i: integer value to add
 *
 * 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
 * @v: pointer of type atomic_t
 * @i: integer value to add
 *
 * 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)
{


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