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/* 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); } /** * 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; } /** * 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; } / * 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; } 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; } 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; } 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; } 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; } 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_sub(i, v) arch_atomic64_fetch_add(-(i), (v)) #endif / _ASM_X86_ATOMIC64_32_H */

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