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#ifndef _ASM_X86_ATOMIC64_32_H |
#define _ASM_X86_ATOMIC64_32_H |
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#include <linux/compiler.h> |
#include <linux/types.h> |
#include <asm/processor.h> |
//#include <asm/cmpxchg.h> |
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/* An 64bit atomic type */ |
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typedef struct { |
u64 __aligned(8) counter; |
} atomic64_t; |
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#define ATOMIC64_INIT(val) { (val) } |
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#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 |
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#ifdef CONFIG_X86_CMPXCHG64 |
#define __alternative_atomic64(f, g, out, in...) \ |
asm volatile("call %P[func]" \ |
: out : [func] "i" (atomic64_##g##_cx8), ## in) |
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#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) |
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#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \ |
ATOMIC64_DECL_ONE(sym##_386) |
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ATOMIC64_DECL_ONE(add_386); |
ATOMIC64_DECL_ONE(sub_386); |
ATOMIC64_DECL_ONE(inc_386); |
ATOMIC64_DECL_ONE(dec_386); |
#endif |
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#define alternative_atomic64(f, out, in...) \ |
__alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in) |
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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); |
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#undef ATOMIC64_DECL |
#undef ATOMIC64_DECL_ONE |
#undef __ATOMIC64_DECL |
#undef ATOMIC64_EXPORT |
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/** |
* 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. |
*/ |
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static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n) |
{ |
return cmpxchg64(&v->counter, o, n); |
} |
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/** |
* 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; |
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asm volatile( |
"1: \n\t" |
"cmpxchg8b (%%esi) \n\t" |
"jnz 1b \n\t" |
:"=&A" (o) |
:"S" (v), "b" (low), "c" (high) |
: "memory", "cc"); |
return o; |
} |
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/** |
* 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) |
{ |
__sync_lock_test_and_set((long long *)&v->counter, i); |
} |
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/** |
* 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) |
{ |
return __sync_fetch_and_add( (long long *)&v->counter, 0); |
} |
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/** |
* 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; |
} |
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/* |
* 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; |
} |
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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; |
} |
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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; |
} |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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/** |
* 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"); |
} |
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/** |
* 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"); |
} |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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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; |
} |
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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; |
} |
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#undef alternative_atomic64 |
#undef __alternative_atomic64 |
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#endif /* _ASM_X86_ATOMIC64_32_H */ |