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Diffstat (limited to 'arch/x86/include/asm/atomic64_32.h')
| -rw-r--r-- | arch/x86/include/asm/atomic64_32.h | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/arch/x86/include/asm/atomic64_32.h b/arch/x86/include/asm/atomic64_32.h new file mode 100644 index 000000000..b154de75c --- /dev/null +++ b/arch/x86/include/asm/atomic64_32.h @@ -0,0 +1,316 @@ +#ifndef _ASM_X86_ATOMIC64_32_H +#define _ASM_X86_ATOMIC64_32_H + +#include <linux/compiler.h> +#include <linux/types.h> +#include <asm/processor.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); +} + +/** + * 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; +} + +/** + * 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"); +} + +/** + * 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; + } + +/** + * 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; +} + +/* + * 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; +} + +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; +} + +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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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"); +} + +/** + * 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"); +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + + +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; +} + +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; +} + +#undef alternative_atomic64 +#undef __alternative_atomic64 + +#endif /* _ASM_X86_ATOMIC64_32_H */ |