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/* Copyright (C) 2010-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef _BITS_ATOMIC_H
#define _BITS_ATOMIC_H 1
#include <stdint.h>
/* This is needed to break a depencency loop, we do not need errno anyway */
#ifndef _ERRNO_H
# define _ERRNO_H
# include <sysdep.h>
# undef _ERRNO_H
#else
# include <sysdep.h>
#endif
/* Or1k has no atomic compare-and-exchange operation, but the
kernel provides userspace atomicity operations. Use them. */
typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;
typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;
/* TODO: Move these to a kernel header */
#define OR1K_ATOMIC_SWAP 1
#define OR1K_ATOMIC_CMPXCHG 2
#define OR1K_ATOMIC_XCHG 3
#define OR1K_ATOMIC_ADD 4
#define OR1K_ATOMIC_DECPOS 5
#define OR1K_ATOMIC_AND 6
#define OR1K_ATOMIC_OR 7
#define OR1K_ATOMIC_UMAX 8
#define OR1K_ATOMIC_UMIN 9
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 4, \
OR1K_ATOMIC_CMPXCHG, mem, oldval, newval) \
: __atomic_error_bad_argument_size ()))
#define atomic_exchange_acq(mem, newval) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 3, \
OR1K_ATOMIC_XCHG, mem, newval) \
: __atomic_error_bad_argument_size ()))
#define atomic_exchange_and_add_acq(mem, val) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 3, \
OR1K_ATOMIC_ADD, mem, val) \
: __atomic_error_bad_argument_size ()))
#define atomic_decrement_if_positive(mem) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 2, \
OR1K_ATOMIC_DECPOS, mem) \
: __atomic_error_bad_argument_size ()))
#define atomic_and_val(mem, mask) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 3, \
OR1K_ATOMIC_AND, mem, mask) \
: __atomic_error_bad_argument_size ()))
#define atomic_or_val(mem, mask) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 3, \
OR1K_ATOMIC_OR, mem, mask) \
: __atomic_error_bad_argument_size ()))
#define atomic_max_val(mem, val) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 3, \
OR1K_ATOMIC_UMAX, mem, val) \
: __atomic_error_bad_argument_size ()))
#define atomic_min_val(mem, val) \
((__typeof (*(mem))) ((sizeof (*(mem)) == 4) ? \
INTERNAL_SYSCALL (or1k_atomic, , 3, \
OR1K_ATOMIC_UMIN, mem, val) \
: __atomic_error_bad_argument_size ()))
/* atomic_bit_test_set in terms of atomic_or_val. */
#define atomic_bit_test_set(mem, bit) \
({ __typeof (*(mem)) __att0_mask = ((__typeof (*(mem))) 1 << (bit)); \
atomic_or_val ((mem), __att0_mask) & __att0_mask; })
/* Various macros that should just be synonyms. */
#define catomic_exchange_and_add atomic_exchange_and_add
#define atomic_and(mem, mask) ((void) atomic_and_val ((mem), (mask)))
#define catomic_and atomic_and
#define atomic_or(mem, mask) ((void) atomic_or_val ((mem), (mask)))
#define catomic_or atomic_or
#define atomic_max(mem, val) ((void)atomic_max_val ((mem), (val)))
#define catomic_max atomic_max
#define atomic_min(mem, val) ((void)atomic_min_val ((mem), (val)))
#define catomic_min atomic_min
/*
* This non-existent symbol is called for unsupporrted sizes,
* indicating a bug in the caller.
*/
extern int __atomic_error_bad_argument_size(void)
__attribute__ ((error ("bad sizeof atomic argument")));
#endif
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