Release 4.14 arch/x86/include/asm/atomic64_32.h

Directory: arch/x86/include/asm
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_ATOMIC64_32_H

#define _ASM_X86_ATOMIC64_32_H

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

/* An 64bit atomic type */

typedef struct {
	
u64 __aligned(8) counter;

} atomic64_t;


#define ATOMIC64_INIT(val)	{ (val) }


#define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)
#ifndef ATOMIC64_EXPORT

#define ATOMIC64_DECL_ONE __ATOMIC64_DECL
#else

#define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \
        ATOMIC64_EXPORT(atomic64_##sym)
#endif

#ifdef CONFIG_X86_CMPXCHG64

#define __alternative_atomic64(f, g, out, in...) \
	asm volatile("call %P[func]" \
                     : out : [func] "i" (atomic64_##g##_cx8), ## in)


#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
#else

#define __alternative_atomic64(f, g, out, in...) \
	alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \
                         X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in)


#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \
        ATOMIC64_DECL_ONE(sym##_386)


ATOMIC64_DECL_ONE(add_386);

ATOMIC64_DECL_ONE(sub_386);

ATOMIC64_DECL_ONE(inc_386);

ATOMIC64_DECL_ONE(dec_386);
#endif


#define alternative_atomic64(f, out, in...) \
	__alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)


ATOMIC64_DECL(read);

ATOMIC64_DECL(set);

ATOMIC64_DECL(xchg);

ATOMIC64_DECL(add_return);

ATOMIC64_DECL(sub_return);

ATOMIC64_DECL(inc_return);

ATOMIC64_DECL(dec_return);

ATOMIC64_DECL(dec_if_positive);

ATOMIC64_DECL(inc_not_zero);

ATOMIC64_DECL(add_unless);


#undef ATOMIC64_DECL

#undef ATOMIC64_DECL_ONE

#undef __ATOMIC64_DECL

#undef ATOMIC64_EXPORT

/**
 * atomic64_cmpxchg - cmpxchg atomic64 variable
 * @v: pointer to type atomic64_t
 * @o: expected value
 * @n: new value
 *
 * Atomically sets @v to @n if it was equal to @o and returns
 * the old value.
 */



static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
{
	return cmpxchg64(&v->counter, o, n);
}

Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 26 78.79% 1 50.00%
Brian Gerst 7 21.21% 1 50.00%
Total 33 100.00% 2 100.00%

/**
 * atomic64_xchg - xchg atomic64 variable
 * @v: pointer to type atomic64_t
 * @n: value to assign
 *
 * Atomically xchgs the value of @v to @n and returns
 * the old value.
 */


static inline long long atomic64_xchg(atomic64_t *v, long long n)
{
	long long o;
	unsigned high = (unsigned)(n >> 32);
	unsigned low = (unsigned)n;
	alternative_atomic64(xchg, "=&A" (o),
			     "S" (v), "b" (low), "c" (high)
			     : "memory");
	return o;
}

Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 37 52.86% 1 33.33%
Jan Beulich 27 38.57% 1 33.33%
Brian Gerst 6 8.57% 1 33.33%
Total 70 100.00% 3 100.00%

/**
 * atomic64_set - set atomic64 variable
 * @v: pointer to type atomic64_t
 * @i: value to assign
 *
 * Atomically sets the value of @v to @n.
 */


static inline void atomic64_set(atomic64_t *v, long long i)
{
	unsigned high = (unsigned)(i >> 32);
	unsigned low = (unsigned)i;
	alternative_atomic64(set, /* no output */,
			     "S" (v), "b" (low), "c" (high)
			     : "eax", "edx", "memory");
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 28 44.44% 1 33.33%
Luca Barbieri 28 44.44% 1 33.33%
Brian Gerst 7 11.11% 1 33.33%
Total 63 100.00% 3 100.00%

/**
 * atomic64_read - read atomic64 variable
 * @v: pointer to type atomic64_t
 *
 * Atomically reads the value of @v and returns it.
 */


static inline long long atomic64_read(const atomic64_t *v)
{
	long long r;
	alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
	return r;
 }

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 17 45.95% 1 25.00%
Brian Gerst 12 32.43% 1 25.00%
Luca Barbieri 7 18.92% 1 25.00%
H. Peter Anvin 1 2.70% 1 25.00%
Total 37 100.00% 4 100.00%

/**
 * 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 long atomic64_add_return(long long i, atomic64_t *v)
{
	alternative_atomic64(add_return,
			     ASM_OUTPUT2("+A" (i), "+c" (v)),
			     ASM_NO_INPUT_CLOBBER("memory"));
	return i;
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 23 54.76% 1 33.33%
Luca Barbieri 13 30.95% 1 33.33%
Brian Gerst 6 14.29% 1 33.33%
Total 42 100.00% 3 100.00%

/*
 * Other variants with different arithmetic operators:
 */


static inline long long atomic64_sub_return(long long i, atomic64_t *v)
{
	alternative_atomic64(sub_return,
			     ASM_OUTPUT2("+A" (i), "+c" (v)),
			     ASM_NO_INPUT_CLOBBER("memory"));
	return i;
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 23 54.76% 1 33.33%
Luca Barbieri 13 30.95% 1 33.33%
Brian Gerst 6 14.29% 1 33.33%
Total 42 100.00% 3 100.00%



static inline long long atomic64_inc_return(atomic64_t *v)
{
	long long a;
	alternative_atomic64(inc_return, "=&A" (a),
			     "S" (v) : "memory", "ecx");
	return a;
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 19 50.00% 1 33.33%
Luca Barbieri 14 36.84% 1 33.33%
Brian Gerst 5 13.16% 1 33.33%
Total 38 100.00% 3 100.00%



static inline long long atomic64_dec_return(atomic64_t *v)
{
	long long a;
	alternative_atomic64(dec_return, "=&A" (a),
			     "S" (v) : "memory", "ecx");
	return a;
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 19 50.00% 1 33.33%
Luca Barbieri 14 36.84% 1 33.33%
Brian Gerst 5 13.16% 1 33.33%
Total 38 100.00% 3 100.00%

/**
 * 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 long long atomic64_add(long long i, atomic64_t *v)
{
	__alternative_atomic64(add, add_return,
			       ASM_OUTPUT2("+A" (i), "+c" (v)),
			       ASM_NO_INPUT_CLOBBER("memory"));
	return i;
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 25 56.82% 1 33.33%
Luca Barbieri 13 29.55% 1 33.33%
Brian Gerst 6 13.64% 1 33.33%
Total 44 100.00% 3 100.00%

/**
 * atomic64_sub - subtract the atomic64 variable
 * @i: integer value to subtract
 * @v: pointer to type atomic64_t
 *
 * Atomically subtracts @i from @v.
 */


static inline long long atomic64_sub(long long i, atomic64_t *v)
{
	__alternative_atomic64(sub, sub_return,
			       ASM_OUTPUT2("+A" (i), "+c" (v)),
			       ASM_NO_INPUT_CLOBBER("memory"));
	return i;
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 25 56.82% 1 33.33%
Luca Barbieri 13 29.55% 1 33.33%
Brian Gerst 6 13.64% 1 33.33%
Total 44 100.00% 3 100.00%

/**
 * 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 long i, atomic64_t *v)
{
	return atomic64_sub_return(i, v) == 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 18 72.00% 1 50.00%
Brian Gerst 7 28.00% 1 50.00%
Total 25 100.00% 2 100.00%

/**
 * atomic64_inc - increment atomic64 variable
 * @v: pointer to type atomic64_t
 *
 * Atomically increments @v by 1.
 */


static inline void atomic64_inc(atomic64_t *v)
{
	__alternative_atomic64(inc, inc_return, /* no output */,
			       "S" (v) : "memory", "eax", "ecx", "edx");
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 22 66.67% 1 33.33%
Brian Gerst 6 18.18% 1 33.33%
Luca Barbieri 5 15.15% 1 33.33%
Total 33 100.00% 3 100.00%

/**
 * atomic64_dec - decrement atomic64 variable
 * @v: pointer to type atomic64_t
 *
 * Atomically decrements @v by 1.
 */


static inline void atomic64_dec(atomic64_t *v)
{
	__alternative_atomic64(dec, dec_return, /* no output */,
			       "S" (v) : "memory", "eax", "ecx", "edx");
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 22 66.67% 1 33.33%
Brian Gerst 6 18.18% 1 33.33%
Luca Barbieri 5 15.15% 1 33.33%
Total 33 100.00% 3 100.00%

/**
 * 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)
{
	return atomic64_dec_return(v) == 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 13 68.42% 1 50.00%
Brian Gerst 6 31.58% 1 50.00%
Total 19 100.00% 2 100.00%

/**
 * 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)
{
	return atomic64_inc_return(v) == 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 13 68.42% 1 50.00%
Brian Gerst 6 31.58% 1 50.00%
Total 19 100.00% 2 100.00%

/**
 * 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 long i, atomic64_t *v)
{
	return atomic64_add_return(i, v) < 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 19 76.00% 1 50.00%
Brian Gerst 6 24.00% 1 50.00%
Total 25 100.00% 2 100.00%

/**
 * atomic64_add_unless - add unless the number is a given value
 * @v: pointer of type atomic64_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 the add was done, zero otherwise.
 */


static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
{
	unsigned low = (unsigned)u;
	unsigned high = (unsigned)(u >> 32);
	alternative_atomic64(add_unless,
			     ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
			     "S" (v) : "memory");
	return (int)a;
}


Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 45 60.00% 1 33.33%
Jan Beulich 30 40.00% 2 66.67%
Total 75 100.00% 3 100.00%



static inline int atomic64_inc_not_zero(atomic64_t *v)
{
	int r;
	alternative_atomic64(inc_not_zero, "=&a" (r),
			     "S" (v) : "ecx", "edx", "memory");
	return r;
}

Contributors
Person Tokens Prop Commits CommitProp
Jan Beulich 21 55.26% 1 33.33%
Luca Barbieri 16 42.11% 1 33.33%
Brian Gerst 1 2.63% 1 33.33%
Total 38 100.00% 3 100.00%



static inline long long atomic64_dec_if_positive(atomic64_t *v)
{
	long long r;
	alternative_atomic64(dec_if_positive, "=&A" (r),
			     "S" (v) : "ecx", "memory");
	return r;
}

Contributors
Person Tokens Prop Commits CommitProp
Luca Barbieri 19 50.00% 1 50.00%
Jan Beulich 19 50.00% 1 50.00%
Total 38 100.00% 2 100.00%


#undef alternative_atomic64

#undef __alternative_atomic64



static inline void atomic64_and(long long i, atomic64_t *v)
{
	long long old, c = 0;

	while ((old = atomic64_cmpxchg(v, c, c & i)) != c)
		c = old;
}

Contributors
Person Tokens Prop Commits CommitProp
Dmitriy Vyukov 43 93.48% 1 50.00%
Peter Zijlstra 3 6.52% 1 50.00%
Total 46 100.00% 2 100.00%



static inline long long atomic64_fetch_and(long long i, atomic64_t *v)
{
	long long old, c = 0;

	while ((old = atomic64_cmpxchg(v, c, c & i)) != c)
		c = old;

	return old;
}

Contributors
Person Tokens Prop Commits CommitProp
Dmitriy Vyukov 44 88.00% 1 50.00%
Peter Zijlstra 6 12.00% 1 50.00%
Total 50 100.00% 2 100.00%



static inline void atomic64_or(long long i, atomic64_t *v)
{
	long long old, c = 0;

	while ((old = atomic64_cmpxchg(v, c, c | i)) != c)
		c = old;
}

Contributors
Person Tokens Prop Commits CommitProp
Dmitriy Vyukov 41 89.13% 1 50.00%
Peter Zijlstra 5 10.87% 1 50.00%
Total 46 100.00% 2 100.00%



static inline long long atomic64_fetch_or(long long i, atomic64_t *v)
{
	long long old, c = 0;

	while ((old = atomic64_cmpxchg(v, c, c | i)) != c)
		c = old;

	return old;
}

Contributors
Person Tokens Prop Commits CommitProp
Dmitriy Vyukov 44 88.00% 1 33.33%
Peter Zijlstra 6 12.00% 2 66.67%
Total 50 100.00% 3 100.00%



static inline void atomic64_xor(long long i, atomic64_t *v)
{
	long long old, c = 0;

	while ((old = atomic64_cmpxchg(v, c, c ^ i)) != c)
		c = old;
}

Contributors
Person Tokens Prop Commits CommitProp
Dmitriy Vyukov 43 93.48% 1 50.00%
Peter Zijlstra 3 6.52% 1 50.00%
Total 46 100.00% 2 100.00%



static inline long long atomic64_fetch_xor(long long i, atomic64_t *v)
{
	long long old, c = 0;

	while ((old = atomic64_cmpxchg(v, c, c ^ i)) != c)
		c = old;

	return old;
}

Contributors
Person Tokens Prop Commits CommitProp
Dmitriy Vyukov 47 94.00% 1 50.00%
Peter Zijlstra 3 6.00% 1 50.00%
Total 50 100.00% 2 100.00%



static inline long long atomic64_fetch_add(long long i, atomic64_t *v)
{
	long long old, c = 0;

	while ((old = atomic64_cmpxchg(v, c, c + i)) != c)
		c = old;

	return old;
}

Contributors
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Dmitriy Vyukov 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%


#define atomic64_fetch_sub(i, v)	atomic64_fetch_add(-(i), (v))

#endif /* _ASM_X86_ATOMIC64_32_H */
Overall Contributors
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Jan Beulich 468 35.11% 2 20.00%
Luca Barbieri 370 27.76% 1 10.00%
Dmitriy Vyukov 321 24.08% 1 10.00%
Brian Gerst 142 10.65% 1 10.00%
Peter Zijlstra 26 1.95% 2 20.00%
Philipp Hahn 4 0.30% 1 10.00%
H. Peter Anvin 1 0.08% 1 10.00%
Greg Kroah-Hartman 1 0.08% 1 10.00%
Total 1333 100.00% 10 100.00%
Directory: arch/x86/include/asm

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Brian Gerst	7	21.21%	1	50.00%
Total	33	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 arch/x86/include/asm/atomic64_32.h

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