arch/x86/include/asm/atomic64_32.h - linux - Git at Google

 /* 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 {
 	s64 __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

 /**
  * arch_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 s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
 {
 	return arch_cmpxchg64(&v->counter, o, n);
 }
 #define arch_atomic64_cmpxchg arch_atomic64_cmpxchg

 /**
  * arch_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 s64 arch_atomic64_xchg(atomic64_t *v, s64 n)
 {
 	s64 o;
 	unsigned high = (unsigned)(n >> 32);
 	unsigned low = (unsigned)n;
 	alternative_atomic64(xchg, "=&A" (o),
 			     "S" (v), "b" (low), "c" (high)
 			     : "memory");
 	return o;
 }
 #define arch_atomic64_xchg arch_atomic64_xchg

 /**
  * arch_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 arch_atomic64_set(atomic64_t *v, s64 i)
 {
 	unsigned high = (unsigned)(i >> 32);
 	unsigned low = (unsigned)i;
 	alternative_atomic64(set, /* no output */,
 			     "S" (v), "b" (low), "c" (high)
 			     : "eax", "edx", "memory");
 }

 /**
  * arch_atomic64_read - read atomic64 variable
  * @v: pointer to type atomic64_t
  *
  * Atomically reads the value of @v and returns it.
  */
 static inline s64 arch_atomic64_read(const atomic64_t *v)
 {
 	s64 r;
 	alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
 	return r;
 }

 /**
  * arch_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 s64 arch_atomic64_add_return(s64 i, atomic64_t *v)
 {
 	alternative_atomic64(add_return,
 			     ASM_OUTPUT2("+A" (i), "+c" (v)),
 			     ASM_NO_INPUT_CLOBBER("memory"));
 	return i;
 }
 #define arch_atomic64_add_return arch_atomic64_add_return

 /*
  * Other variants with different arithmetic operators:
  */
 static inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v)
 {
 	alternative_atomic64(sub_return,
 			     ASM_OUTPUT2("+A" (i), "+c" (v)),
 			     ASM_NO_INPUT_CLOBBER("memory"));
 	return i;
 }
 #define arch_atomic64_sub_return arch_atomic64_sub_return

 static inline s64 arch_atomic64_inc_return(atomic64_t *v)
 {
 	s64 a;
 	alternative_atomic64(inc_return, "=&A" (a),
 			     "S" (v) : "memory", "ecx");
 	return a;
 }
 #define arch_atomic64_inc_return arch_atomic64_inc_return

 static inline s64 arch_atomic64_dec_return(atomic64_t *v)
 {
 	s64 a;
 	alternative_atomic64(dec_return, "=&A" (a),
 			     "S" (v) : "memory", "ecx");
 	return a;
 }
 #define arch_atomic64_dec_return arch_atomic64_dec_return

 /**
  * arch_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 s64 arch_atomic64_add(s64 i, atomic64_t *v)
 {
 	__alternative_atomic64(add, add_return,
 			       ASM_OUTPUT2("+A" (i), "+c" (v)),
 			       ASM_NO_INPUT_CLOBBER("memory"));
 	return i;
 }

 /**
  * arch_atomic64_sub - subtract the atomic64 variable
  * @i: integer value to subtract
  * @v: pointer to type atomic64_t
  *
  * Atomically subtracts @i from @v.
  */
 static inline s64 arch_atomic64_sub(s64 i, atomic64_t *v)
 {
 	__alternative_atomic64(sub, sub_return,
 			       ASM_OUTPUT2("+A" (i), "+c" (v)),
 			       ASM_NO_INPUT_CLOBBER("memory"));
 	return i;
 }

 /**
  * arch_atomic64_inc - increment atomic64 variable
  * @v: pointer to type atomic64_t
  *
  * Atomically increments @v by 1.
  */
 static inline void arch_atomic64_inc(atomic64_t *v)
 {
 	__alternative_atomic64(inc, inc_return, /* no output */,
 			       "S" (v) : "memory", "eax", "ecx", "edx");
 }
 #define arch_atomic64_inc arch_atomic64_inc

 /**
  * arch_atomic64_dec - decrement atomic64 variable
  * @v: pointer to type atomic64_t
  *
  * Atomically decrements @v by 1.
  */
 static inline void arch_atomic64_dec(atomic64_t *v)
 {
 	__alternative_atomic64(dec, dec_return, /* no output */,
 			       "S" (v) : "memory", "eax", "ecx", "edx");
 }
 #define arch_atomic64_dec arch_atomic64_dec

 /**
  * arch_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 arch_atomic64_add_unless(atomic64_t *v, s64 a, s64 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;
 }
 #define arch_atomic64_add_unless arch_atomic64_add_unless

 static inline int arch_atomic64_inc_not_zero(atomic64_t *v)
 {
 	int r;
 	alternative_atomic64(inc_not_zero, "=&a" (r),
 			     "S" (v) : "ecx", "edx", "memory");
 	return r;
 }
 #define arch_atomic64_inc_not_zero arch_atomic64_inc_not_zero

 static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
 {
 	s64 r;
 	alternative_atomic64(dec_if_positive, "=&A" (r),
 			     "S" (v) : "ecx", "memory");
 	return r;
 }
 #define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive

 #undef alternative_atomic64
 #undef __alternative_atomic64

 static inline void arch_atomic64_and(s64 i, atomic64_t *v)
 {
 	s64 old, c = 0;

 	while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
 		c = old;
 }

 static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
 {
 	s64 old, c = 0;

 	while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
 		c = old;

 	return old;
 }
 #define arch_atomic64_fetch_and arch_atomic64_fetch_and

 static inline void arch_atomic64_or(s64 i, atomic64_t *v)
 {
 	s64 old, c = 0;

 	while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
 		c = old;
 }

 static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
 {
 	s64 old, c = 0;

 	while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
 		c = old;

 	return old;
 }
 #define arch_atomic64_fetch_or arch_atomic64_fetch_or

 static inline void arch_atomic64_xor(s64 i, atomic64_t *v)
 {
 	s64 old, c = 0;

 	while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
 		c = old;
 }

 static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
 {
 	s64 old, c = 0;

 	while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
 		c = old;

 	return old;
 }
 #define arch_atomic64_fetch_xor arch_atomic64_fetch_xor

 static inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v)
 {
 	s64 old, c = 0;

 	while ((old = arch_atomic64_cmpxchg(v, c, c + i)) != c)
 		c = old;

 	return old;
 }
 #define arch_atomic64_fetch_add arch_atomic64_fetch_add

 #define arch_atomic64_fetch_sub(i, v)	arch_atomic64_fetch_add(-(i), (v))

 #endif /* _ASM_X86_ATOMIC64_32_H */
	/* 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 {
	s64 __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

	/**
	* arch_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 s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
	{
	return arch_cmpxchg64(&v->counter, o, n);
	}
	#define arch_atomic64_cmpxchg arch_atomic64_cmpxchg

	/**
	* arch_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 s64 arch_atomic64_xchg(atomic64_t *v, s64 n)
	{
	s64 o;
	unsigned high = (unsigned)(n >> 32);
	unsigned low = (unsigned)n;
	alternative_atomic64(xchg, "=&A" (o),
	"S" (v), "b" (low), "c" (high)
	: "memory");
	return o;
	}
	#define arch_atomic64_xchg arch_atomic64_xchg

	/**
	* arch_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 arch_atomic64_set(atomic64_t *v, s64 i)
	{
	unsigned high = (unsigned)(i >> 32);
	unsigned low = (unsigned)i;
	alternative_atomic64(set, /* no output */,
	"S" (v), "b" (low), "c" (high)
	: "eax", "edx", "memory");
	}

	/**
	* arch_atomic64_read - read atomic64 variable
	* @v: pointer to type atomic64_t
	*
	* Atomically reads the value of @v and returns it.
	*/
	static inline s64 arch_atomic64_read(const atomic64_t *v)
	{
	s64 r;
	alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
	return r;
	}

	/**
	* arch_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 s64 arch_atomic64_add_return(s64 i, atomic64_t *v)
	{
	alternative_atomic64(add_return,
	ASM_OUTPUT2("+A" (i), "+c" (v)),
	ASM_NO_INPUT_CLOBBER("memory"));
	return i;
	}
	#define arch_atomic64_add_return arch_atomic64_add_return

	/*
	* Other variants with different arithmetic operators:
	*/
	static inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v)
	{
	alternative_atomic64(sub_return,
	ASM_OUTPUT2("+A" (i), "+c" (v)),
	ASM_NO_INPUT_CLOBBER("memory"));
	return i;
	}
	#define arch_atomic64_sub_return arch_atomic64_sub_return

	static inline s64 arch_atomic64_inc_return(atomic64_t *v)
	{
	s64 a;
	alternative_atomic64(inc_return, "=&A" (a),
	"S" (v) : "memory", "ecx");
	return a;
	}
	#define arch_atomic64_inc_return arch_atomic64_inc_return

	static inline s64 arch_atomic64_dec_return(atomic64_t *v)
	{
	s64 a;
	alternative_atomic64(dec_return, "=&A" (a),
	"S" (v) : "memory", "ecx");
	return a;
	}
	#define arch_atomic64_dec_return arch_atomic64_dec_return

	/**
	* arch_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 s64 arch_atomic64_add(s64 i, atomic64_t *v)
	{
	__alternative_atomic64(add, add_return,
	ASM_OUTPUT2("+A" (i), "+c" (v)),
	ASM_NO_INPUT_CLOBBER("memory"));
	return i;
	}

	/**
	* arch_atomic64_sub - subtract the atomic64 variable
	* @i: integer value to subtract
	* @v: pointer to type atomic64_t
	*
	* Atomically subtracts @i from @v.
	*/
	static inline s64 arch_atomic64_sub(s64 i, atomic64_t *v)
	{
	__alternative_atomic64(sub, sub_return,
	ASM_OUTPUT2("+A" (i), "+c" (v)),
	ASM_NO_INPUT_CLOBBER("memory"));
	return i;
	}

	/**
	* arch_atomic64_inc - increment atomic64 variable
	* @v: pointer to type atomic64_t
	*
	* Atomically increments @v by 1.
	*/
	static inline void arch_atomic64_inc(atomic64_t *v)
	{
	__alternative_atomic64(inc, inc_return, /* no output */,
	"S" (v) : "memory", "eax", "ecx", "edx");
	}
	#define arch_atomic64_inc arch_atomic64_inc

	/**
	* arch_atomic64_dec - decrement atomic64 variable
	* @v: pointer to type atomic64_t
	*
	* Atomically decrements @v by 1.
	*/
	static inline void arch_atomic64_dec(atomic64_t *v)
	{
	__alternative_atomic64(dec, dec_return, /* no output */,
	"S" (v) : "memory", "eax", "ecx", "edx");
	}
	#define arch_atomic64_dec arch_atomic64_dec

	/**
	* arch_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 arch_atomic64_add_unless(atomic64_t *v, s64 a, s64 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;
	}
	#define arch_atomic64_add_unless arch_atomic64_add_unless

	static inline int arch_atomic64_inc_not_zero(atomic64_t *v)
	{
	int r;
	alternative_atomic64(inc_not_zero, "=&a" (r),
	"S" (v) : "ecx", "edx", "memory");
	return r;
	}
	#define arch_atomic64_inc_not_zero arch_atomic64_inc_not_zero

	static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
	{
	s64 r;
	alternative_atomic64(dec_if_positive, "=&A" (r),
	"S" (v) : "ecx", "memory");
	return r;
	}
	#define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive

	#undef alternative_atomic64
	#undef __alternative_atomic64

	static inline void arch_atomic64_and(s64 i, atomic64_t *v)
	{
	s64 old, c = 0;

	while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
	c = old;
	}

	static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
	{
	s64 old, c = 0;

	while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
	c = old;

	return old;
	}
	#define arch_atomic64_fetch_and arch_atomic64_fetch_and

	static inline void arch_atomic64_or(s64 i, atomic64_t *v)
	{
	s64 old, c = 0;

	while ((old = arch_atomic64_cmpxchg(v, c, c \| i)) != c)
	c = old;
	}

	static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
	{
	s64 old, c = 0;

	while ((old = arch_atomic64_cmpxchg(v, c, c \| i)) != c)
	c = old;

	return old;
	}
	#define arch_atomic64_fetch_or arch_atomic64_fetch_or

	static inline void arch_atomic64_xor(s64 i, atomic64_t *v)
	{
	s64 old, c = 0;

	while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
	c = old;
	}

	static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
	{
	s64 old, c = 0;

	while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
	c = old;

	return old;
	}
	#define arch_atomic64_fetch_xor arch_atomic64_fetch_xor

	static inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v)
	{
	s64 old, c = 0;

	while ((old = arch_atomic64_cmpxchg(v, c, c + i)) != c)
	c = old;

	return old;
	}
	#define arch_atomic64_fetch_add arch_atomic64_fetch_add

	#define arch_atomic64_fetch_sub(i, v) arch_atomic64_fetch_add(-(i), (v))

	#endif /* _ASM_X86_ATOMIC64_32_H */