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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright 2014 Nexenta Systems, Inc. All rights reserved.
* Copyright 2015 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
*/
#ifndef _ASM_ATOMIC_H
#define _ASM_ATOMIC_H
#include <sys/ccompile.h>
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
#if !defined(__lint) && defined(__GNUC__)
/* 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) \
: /* no inputs */ \
: "cc"); \
}
__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, reg) \
extern __GNU_INLINE void \
fxn(volatile type1 *target, type2 delta) \
{ \
__asm__ __volatile__( \
"lock; " op " %1,%0" \
: "+m" (*target) \
: "i" reg (delta) \
: "cc"); \
}
__ATOMIC_OPXX(atomic_add_8, uint8_t, int8_t, "add" SUF_8, "q")
__ATOMIC_OPXX(atomic_add_16, uint16_t, int16_t, "add" SUF_16, "r")
__ATOMIC_OPXX(atomic_add_32, uint32_t, int32_t, "add" SUF_32, "r")
__ATOMIC_OP64(atomic_add_64, uint64_t, int64_t, "add" SUF_64, "r")
__ATOMIC_OPXX(atomic_add_char, uchar_t, signed char, "add" SUF_8, "q")
__ATOMIC_OPXX(atomic_add_short, ushort_t, short, "add" SUF_16, "r")
__ATOMIC_OPXX(atomic_add_int, uint_t, int, "add" SUF_32, "r")
__ATOMIC_OPXX(atomic_add_long, ulong_t, long, "add" SUF_LONG, "r")
/*
* 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)
: "cc");
}
__ATOMIC_OPXX(atomic_or_8, uint8_t, uint8_t, "or" SUF_8, "q")
__ATOMIC_OPXX(atomic_or_16, uint16_t, uint16_t, "or" SUF_16, "r")
__ATOMIC_OPXX(atomic_or_32, uint32_t, uint32_t, "or" SUF_32, "r")
__ATOMIC_OP64(atomic_or_64, uint64_t, uint64_t, "or" SUF_64, "r")
__ATOMIC_OPXX(atomic_or_uchar, uchar_t, uchar_t, "or" SUF_8, "q")
__ATOMIC_OPXX(atomic_or_ushort, ushort_t, ushort_t, "or" SUF_16, "r")
__ATOMIC_OPXX(atomic_or_uint, uint_t, uint_t, "or" SUF_32, "r")
__ATOMIC_OPXX(atomic_or_ulong, ulong_t, ulong_t, "or" SUF_LONG, "r")
__ATOMIC_OPXX(atomic_and_8, uint8_t, uint8_t, "and" SUF_8, "q")
__ATOMIC_OPXX(atomic_and_16, uint16_t, uint16_t, "and" SUF_16, "r")
__ATOMIC_OPXX(atomic_and_32, uint32_t, uint32_t, "and" SUF_32, "r")
__ATOMIC_OP64(atomic_and_64, uint64_t, uint64_t, "and" SUF_64, "r")
__ATOMIC_OPXX(atomic_and_uchar, uchar_t, uchar_t, "and" SUF_8, "q")
__ATOMIC_OPXX(atomic_and_ushort, ushort_t, ushort_t, "and" SUF_16, "r")
__ATOMIC_OPXX(atomic_and_uint, uint_t, uint_t, "and" SUF_32, "r")
__ATOMIC_OPXX(atomic_and_ulong, ulong_t, ulong_t, "and" SUF_LONG, "r")
#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
}
#endif
#endif /* _ASM_ATOMIC_H */
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