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330 lines
7.8 KiB
330 lines
7.8 KiB
#ifndef _ASM_X86_ATOMIC64_32_H |
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#define _ASM_X86_ATOMIC64_32_H |
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#include <linux/compiler.h> |
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#include <linux/types.h> |
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#include <asm/processor.h> |
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//#include <asm/cmpxchg.h> |
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/* An 64bit atomic type */ |
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typedef struct { |
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u64 __aligned(8) counter; |
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} atomic64_t; |
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#define ATOMIC64_INIT(val) { (val) } |
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#define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...) |
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#ifndef ATOMIC64_EXPORT |
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#define ATOMIC64_DECL_ONE __ATOMIC64_DECL |
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#else |
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#define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \ |
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ATOMIC64_EXPORT(atomic64_##sym) |
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#endif |
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#ifdef CONFIG_X86_CMPXCHG64 |
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#define __alternative_atomic64(f, g, out, in...) \ |
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asm volatile("call %P[func]" \ |
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: out : [func] "i" (atomic64_##g##_cx8), ## in) |
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#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8) |
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#else |
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#define __alternative_atomic64(f, g, out, in...) \ |
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alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \ |
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X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in) |
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#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \ |
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ATOMIC64_DECL_ONE(sym##_386) |
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ATOMIC64_DECL_ONE(add_386); |
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ATOMIC64_DECL_ONE(sub_386); |
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ATOMIC64_DECL_ONE(inc_386); |
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ATOMIC64_DECL_ONE(dec_386); |
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#endif |
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#define alternative_atomic64(f, out, in...) \ |
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__alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in) |
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ATOMIC64_DECL(read); |
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ATOMIC64_DECL(set); |
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ATOMIC64_DECL(xchg); |
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ATOMIC64_DECL(add_return); |
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ATOMIC64_DECL(sub_return); |
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ATOMIC64_DECL(inc_return); |
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ATOMIC64_DECL(dec_return); |
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ATOMIC64_DECL(dec_if_positive); |
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ATOMIC64_DECL(inc_not_zero); |
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ATOMIC64_DECL(add_unless); |
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#undef ATOMIC64_DECL |
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#undef ATOMIC64_DECL_ONE |
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#undef __ATOMIC64_DECL |
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#undef ATOMIC64_EXPORT |
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/** |
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* atomic64_cmpxchg - cmpxchg atomic64 variable |
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* @v: pointer to type atomic64_t |
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* @o: expected value |
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* @n: new value |
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* |
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* Atomically sets @v to @n if it was equal to @o and returns |
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* the old value. |
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*/ |
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static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n) |
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{ |
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return cmpxchg64(&v->counter, o, n); |
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} |
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/** |
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* atomic64_xchg - xchg atomic64 variable |
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* @v: pointer to type atomic64_t |
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* @n: value to assign |
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* |
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* Atomically xchgs the value of @v to @n and returns |
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* the old value. |
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*/ |
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static inline long long atomic64_xchg(atomic64_t *v, long long n) |
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{ |
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long long o; |
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unsigned high = (unsigned)(n >> 32); |
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unsigned low = (unsigned)n; |
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alternative_atomic64(xchg, "=&A" (o), |
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"S" (v), "b" (low), "c" (high) |
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: "memory"); |
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return o; |
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} |
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/** |
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* atomic64_set - set atomic64 variable |
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* @v: pointer to type atomic64_t |
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* @i: value to assign |
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* |
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* Atomically sets the value of @v to @n. |
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*/ |
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static inline void atomic64_set(atomic64_t *v, long long i) |
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{ |
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unsigned high = (unsigned)(i >> 32); |
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unsigned low = (unsigned)i; |
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alternative_atomic64(set, /* no output */, |
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"S" (v), "b" (low), "c" (high) |
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: "eax", "edx", "memory"); |
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} |
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/** |
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* atomic64_read - read atomic64 variable |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically reads the value of @v and returns it. |
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*/ |
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static inline long long atomic64_read(const atomic64_t *v) |
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{ |
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long long r; |
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alternative_atomic64(read, "=&A" (r), "c" (v) : "memory"); |
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return r; |
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} |
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/** |
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* atomic64_add_return - add and return |
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* @i: integer value to add |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically adds @i to @v and returns @i + *@v |
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*/ |
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static inline long long atomic64_add_return(long long i, atomic64_t *v) |
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{ |
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alternative_atomic64(add_return, |
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ASM_OUTPUT2("+A" (i), "+c" (v)), |
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ASM_NO_INPUT_CLOBBER("memory")); |
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return i; |
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} |
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/* |
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* Other variants with different arithmetic operators: |
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*/ |
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static inline long long atomic64_sub_return(long long i, atomic64_t *v) |
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{ |
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alternative_atomic64(sub_return, |
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ASM_OUTPUT2("+A" (i), "+c" (v)), |
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ASM_NO_INPUT_CLOBBER("memory")); |
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return i; |
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} |
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static inline long long atomic64_inc_return(atomic64_t *v) |
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{ |
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long long a; |
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alternative_atomic64(inc_return, "=&A" (a), |
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"S" (v) : "memory", "ecx"); |
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return a; |
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} |
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static inline long long atomic64_dec_return(atomic64_t *v) |
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{ |
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long long a; |
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alternative_atomic64(dec_return, "=&A" (a), |
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"S" (v) : "memory", "ecx"); |
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return a; |
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} |
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/** |
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* atomic64_add - add integer to atomic64 variable |
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* @i: integer value to add |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically adds @i to @v. |
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*/ |
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static inline long long atomic64_add(long long i, atomic64_t *v) |
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{ |
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__alternative_atomic64(add, add_return, |
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ASM_OUTPUT2("+A" (i), "+c" (v)), |
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ASM_NO_INPUT_CLOBBER("memory")); |
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return i; |
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} |
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/** |
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* atomic64_sub - subtract the atomic64 variable |
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* @i: integer value to subtract |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically subtracts @i from @v. |
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*/ |
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static inline long long atomic64_sub(long long i, atomic64_t *v) |
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{ |
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__alternative_atomic64(sub, sub_return, |
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ASM_OUTPUT2("+A" (i), "+c" (v)), |
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ASM_NO_INPUT_CLOBBER("memory")); |
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return i; |
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} |
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/** |
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* atomic64_sub_and_test - subtract value from variable and test result |
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* @i: integer value to subtract |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically subtracts @i from @v and returns |
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* true if the result is zero, or false for all |
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* other cases. |
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*/ |
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static inline int atomic64_sub_and_test(long long i, atomic64_t *v) |
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{ |
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return atomic64_sub_return(i, v) == 0; |
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} |
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/** |
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* atomic64_inc - increment atomic64 variable |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically increments @v by 1. |
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*/ |
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static inline void atomic64_inc(atomic64_t *v) |
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{ |
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__alternative_atomic64(inc, inc_return, /* no output */, |
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"S" (v) : "memory", "eax", "ecx", "edx"); |
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} |
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/** |
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* atomic64_dec - decrement atomic64 variable |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically decrements @v by 1. |
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*/ |
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static inline void atomic64_dec(atomic64_t *v) |
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{ |
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__alternative_atomic64(dec, dec_return, /* no output */, |
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"S" (v) : "memory", "eax", "ecx", "edx"); |
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} |
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/** |
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* atomic64_dec_and_test - decrement and test |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically decrements @v by 1 and |
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* returns true if the result is 0, or false for all other |
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* cases. |
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*/ |
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static inline int atomic64_dec_and_test(atomic64_t *v) |
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{ |
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return atomic64_dec_return(v) == 0; |
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} |
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/** |
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* atomic64_inc_and_test - increment and test |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically increments @v by 1 |
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* and returns true if the result is zero, or false for all |
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* other cases. |
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*/ |
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static inline int atomic64_inc_and_test(atomic64_t *v) |
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{ |
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return atomic64_inc_return(v) == 0; |
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} |
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/** |
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* atomic64_add_negative - add and test if negative |
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* @i: integer value to add |
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* @v: pointer to type atomic64_t |
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* |
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* Atomically adds @i to @v and returns true |
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* if the result is negative, or false when |
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* result is greater than or equal to zero. |
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*/ |
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static inline int atomic64_add_negative(long long i, atomic64_t *v) |
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{ |
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return atomic64_add_return(i, v) < 0; |
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} |
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/** |
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* atomic64_add_unless - add unless the number is a given value |
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* @v: pointer of type atomic64_t |
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* @a: the amount to add to v... |
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* @u: ...unless v is equal to u. |
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* |
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* Atomically adds @a to @v, so long as it was not @u. |
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* Returns non-zero if the add was done, zero otherwise. |
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*/ |
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static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u) |
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{ |
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unsigned low = (unsigned)u; |
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unsigned high = (unsigned)(u >> 32); |
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alternative_atomic64(add_unless, |
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ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)), |
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"S" (v) : "memory"); |
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return (int)a; |
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} |
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static inline int atomic64_inc_not_zero(atomic64_t *v) |
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{ |
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int r; |
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alternative_atomic64(inc_not_zero, "=&a" (r), |
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"S" (v) : "ecx", "edx", "memory"); |
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return r; |
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} |
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static inline long long atomic64_dec_if_positive(atomic64_t *v) |
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{ |
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long long r; |
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alternative_atomic64(dec_if_positive, "=&A" (r), |
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"S" (v) : "ecx", "memory"); |
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return r; |
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} |
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#undef alternative_atomic64 |
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#undef __alternative_atomic64 |
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#define ATOMIC64_OP(op, c_op) \ |
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static inline void atomic64_##op(long long i, atomic64_t *v) \ |
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{ \ |
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long long old, c = 0; \ |
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while ((old = atomic64_cmpxchg(v, c, c c_op i)) != c) \ |
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c = old; \ |
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} |
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ATOMIC64_OP(and, &) |
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ATOMIC64_OP(or, |) |
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ATOMIC64_OP(xor, ^) |
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#undef ATOMIC64_OP |
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#endif /* _ASM_X86_ATOMIC64_32_H */
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