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5044 define static inlines for most often used atomic functions
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Reviewed by: Garrett D'Amore <[email protected]>
Approved by: Robert Mustacchi <[email protected]>
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@rmustacc
Josef 'Jeff' Sipek authored and rmustacc committed Aug 12, 2014
1 parent 6ed9368 commit febac2a
Showing 1 changed file with 214 additions and 1 deletion.
215 changes: 214 additions & 1 deletion usr/src/uts/intel/asm/atomic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright 2014 Nexenta Systems, Inc. All rights reserved.
*/

#ifndef _ASM_ATOMIC_H
Expand All @@ -36,14 +37,226 @@ extern "C" {

#if !defined(__lint) && defined(__GNUC__)

#if defined(__amd64)
/* BEGIN CSTYLED */
/*
* This file contains a number of static inline functions implementing
* various atomic variable functions. Note that these are *not* all of the
* atomic_* functions as defined in usr/src/uts/common/sys/atomic.h. All
* possible atomic_* functions are implemented in usr/src/common/atomic in
* pure assembly. In the absence of an identically named function in this
* header file, any use of the function will result in the compiler emitting
* a function call as usual. On the other hand, if an identically named
* function exists in this header as a static inline, the compiler will
* inline its contents and the linker never sees the symbol reference. We
* use this to avoid implementing some of the more complex and less used
* functions and instead falling back to function calls. Note that in some
* cases (e.g., atomic_inc_64) we implement a static inline only on AMD64
* but not i386.
*/

/*
* Instruction suffixes for various operand sizes (assuming AMD64)
*/
#define SUF_8 "b"
#define SUF_16 "w"
#define SUF_32 "l"
#define SUF_64 "q"

#if defined(__amd64)
#define SUF_LONG SUF_64
#define SUF_PTR SUF_64
#define __ATOMIC_OP64(...) __ATOMIC_OPXX(__VA_ARGS__)
#elif defined(__i386)
#define SUF_LONG SUF_32
#define SUF_PTR SUF_32
#define __ATOMIC_OP64(...)
#else
#error "port me"
#endif

#if defined(__amd64) || defined(__i386)

#define __ATOMIC_OPXX(fxn, type, op) \
extern __GNU_INLINE void \
fxn(volatile type *target) \
{ \
__asm__ __volatile__( \
"lock; " op " %0" \
: "+m" (*target)); \
}

__ATOMIC_OPXX(atomic_inc_8, uint8_t, "inc" SUF_8)
__ATOMIC_OPXX(atomic_inc_16, uint16_t, "inc" SUF_16)
__ATOMIC_OPXX(atomic_inc_32, uint32_t, "inc" SUF_32)
__ATOMIC_OP64(atomic_inc_64, uint64_t, "inc" SUF_64)
__ATOMIC_OPXX(atomic_inc_uchar, uchar_t, "inc" SUF_8)
__ATOMIC_OPXX(atomic_inc_ushort, ushort_t, "inc" SUF_16)
__ATOMIC_OPXX(atomic_inc_uint, uint_t, "inc" SUF_32)
__ATOMIC_OPXX(atomic_inc_ulong, ulong_t, "inc" SUF_LONG)

__ATOMIC_OPXX(atomic_dec_8, uint8_t, "dec" SUF_8)
__ATOMIC_OPXX(atomic_dec_16, uint16_t, "dec" SUF_16)
__ATOMIC_OPXX(atomic_dec_32, uint32_t, "dec" SUF_32)
__ATOMIC_OP64(atomic_dec_64, uint64_t, "dec" SUF_64)
__ATOMIC_OPXX(atomic_dec_uchar, uchar_t, "dec" SUF_8)
__ATOMIC_OPXX(atomic_dec_ushort, ushort_t, "dec" SUF_16)
__ATOMIC_OPXX(atomic_dec_uint, uint_t, "dec" SUF_32)
__ATOMIC_OPXX(atomic_dec_ulong, ulong_t, "dec" SUF_LONG)

#undef __ATOMIC_OPXX

#define __ATOMIC_OPXX(fxn, type1, type2, op) \
extern __GNU_INLINE void \
fxn(volatile type1 *target, type2 delta) \
{ \
__asm__ __volatile__( \
"lock; " op " %1,%0" \
: "+m" (*target) \
: "ir" (delta)); \
}

__ATOMIC_OPXX(atomic_add_8, uint8_t, int8_t, "add" SUF_8)
__ATOMIC_OPXX(atomic_add_16, uint16_t, int16_t, "add" SUF_16)
__ATOMIC_OPXX(atomic_add_32, uint32_t, int32_t, "add" SUF_32)
__ATOMIC_OP64(atomic_add_64, uint64_t, int64_t, "add" SUF_64)
__ATOMIC_OPXX(atomic_add_char, uchar_t, signed char, "add" SUF_8)
__ATOMIC_OPXX(atomic_add_short, ushort_t, short, "add" SUF_16)
__ATOMIC_OPXX(atomic_add_int, uint_t, int, "add" SUF_32)
__ATOMIC_OPXX(atomic_add_long, ulong_t, long, "add" SUF_LONG)

/*
* We don't use the above macro here because atomic_add_ptr has an
* inconsistent type. The first argument should really be a 'volatile void
* **'.
*/
extern __GNU_INLINE void
atomic_add_ptr(volatile void *target, ssize_t delta)
{
volatile void **tmp = (volatile void **)target;

__asm__ __volatile__(
"lock; add" SUF_PTR " %1,%0"
: "+m" (*tmp)
: "ir" (delta));
}

__ATOMIC_OPXX(atomic_or_8, uint8_t, uint8_t, "or" SUF_8)
__ATOMIC_OPXX(atomic_or_16, uint16_t, uint16_t, "or" SUF_16)
__ATOMIC_OPXX(atomic_or_32, uint32_t, uint32_t, "or" SUF_32)
__ATOMIC_OP64(atomic_or_64, uint64_t, uint64_t, "or" SUF_64)
__ATOMIC_OPXX(atomic_or_uchar, uchar_t, uchar_t, "or" SUF_8)
__ATOMIC_OPXX(atomic_or_ushort, ushort_t, ushort_t, "or" SUF_16)
__ATOMIC_OPXX(atomic_or_uint, uint_t, uint_t, "or" SUF_32)
__ATOMIC_OPXX(atomic_or_ulong, ulong_t, ulong_t, "or" SUF_LONG)

__ATOMIC_OPXX(atomic_and_8, uint8_t, uint8_t, "and" SUF_8)
__ATOMIC_OPXX(atomic_and_16, uint16_t, uint16_t, "and" SUF_16)
__ATOMIC_OPXX(atomic_and_32, uint32_t, uint32_t, "and" SUF_32)
__ATOMIC_OP64(atomic_and_64, uint64_t, uint64_t, "and" SUF_64)
__ATOMIC_OPXX(atomic_and_uchar, uchar_t, uchar_t, "and" SUF_8)
__ATOMIC_OPXX(atomic_and_ushort, ushort_t, ushort_t, "and" SUF_16)
__ATOMIC_OPXX(atomic_and_uint, uint_t, uint_t, "and" SUF_32)
__ATOMIC_OPXX(atomic_and_ulong, ulong_t, ulong_t, "and" SUF_LONG)

#undef __ATOMIC_OPXX

#define __ATOMIC_OPXX(fxn, type, op, reg) \
extern __GNU_INLINE type \
fxn(volatile type *target, type cmp, type new) \
{ \
type ret; \
__asm__ __volatile__( \
"lock; " op " %2,%0" \
: "+m" (*target), "=a" (ret) \
: reg (new), "1" (cmp) \
: "cc"); \
return (ret); \
}

__ATOMIC_OPXX(atomic_cas_8, uint8_t, "cmpxchg" SUF_8, "q")
__ATOMIC_OPXX(atomic_cas_16, uint16_t, "cmpxchg" SUF_16, "r")
__ATOMIC_OPXX(atomic_cas_32, uint32_t, "cmpxchg" SUF_32, "r")
__ATOMIC_OP64(atomic_cas_64, uint64_t, "cmpxchg" SUF_64, "r")
__ATOMIC_OPXX(atomic_cas_uchar, uchar_t, "cmpxchg" SUF_8, "q")
__ATOMIC_OPXX(atomic_cas_ushort, ushort_t, "cmpxchg" SUF_16, "r")
__ATOMIC_OPXX(atomic_cas_uint, uint_t, "cmpxchg" SUF_32, "r")
__ATOMIC_OPXX(atomic_cas_ulong, ulong_t, "cmpxchg" SUF_LONG, "r")

#undef __ATOMIC_OPXX

/*
* We don't use the above macro here because atomic_cas_ptr has an
* inconsistent type. The first argument should really be a 'volatile void
* **'.
*/
extern __GNU_INLINE void *
atomic_cas_ptr(volatile void *target, void *cmp, void *new)
{
volatile void **tmp = (volatile void **)target;
void *ret;

__asm__ __volatile__(
"lock; cmpxchg" SUF_PTR " %2,%0"
: "+m" (*tmp), "=a" (ret)
: "r" (new), "1" (cmp)
: "cc");

return (ret);
}

#define __ATOMIC_OPXX(fxn, type, op, reg) \
extern __GNU_INLINE type \
fxn(volatile type *target, type val) \
{ \
__asm__ __volatile__( \
op " %1,%0" \
: "+m" (*target), "+" reg (val)); \
return (val); \
}

__ATOMIC_OPXX(atomic_swap_8, uint8_t, "xchg" SUF_8, "q")
__ATOMIC_OPXX(atomic_swap_16, uint16_t, "xchg" SUF_16, "r")
__ATOMIC_OPXX(atomic_swap_32, uint32_t, "xchg" SUF_32, "r")
__ATOMIC_OP64(atomic_swap_64, uint64_t, "xchg" SUF_64, "r")
__ATOMIC_OPXX(atomic_swap_uchar, uchar_t, "xchg" SUF_8, "q")
__ATOMIC_OPXX(atomic_swap_ushort, ushort_t, "xchg" SUF_16, "r")
__ATOMIC_OPXX(atomic_swap_uint, uint_t, "xchg" SUF_32, "r")
__ATOMIC_OPXX(atomic_swap_ulong, ulong_t, "xchg" SUF_LONG, "r")

#undef __ATOMIC_OPXX

/*
* We don't use the above macro here because atomic_swap_ptr has an
* inconsistent type. The first argument should really be a 'volatile void
* **'.
*/
extern __GNU_INLINE void *
atomic_swap_ptr(volatile void *target, void *val)
{
volatile void **tmp = (volatile void **)target;

__asm__ __volatile__(
"xchg" SUF_PTR " %1,%0"
: "+m" (*tmp), "+r" (val));

return (val);
}

#else
#error "port me"
#endif

#undef SUF_8
#undef SUF_16
#undef SUF_32
#undef SUF_64
#undef SUF_LONG
#undef SUF_PTR

#undef __ATOMIC_OP64

/* END CSTYLED */

#endif /* !__lint && __GNUC__ */

#ifdef __cplusplus
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