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/* Low-level functions for atomic operations. S390 version.
Copyright (C) 2000, 2001 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
This file is part of the GNU C Library.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _ATOMICITY_H
#define _ATOMICITY_H 1
#include <inttypes.h>
static inline int
__attribute__ ((unused))
exchange_and_add (volatile uint32_t *mem, int val)
{
int result;
__asm__ __volatile__(
" L %0,%2\n"
" LA 2,%1\n"
"0: LR 0,%0\n"
" AR 0,%3\n"
" CS %0,0,0(2)\n"
" JL 0b"
: "=&d" (result), "=m" (*mem)
: "1" (*mem), "d" (val) : "0", "1", "2" );
return result;
}
static inline void
__attribute__ ((unused))
atomic_add (volatile uint32_t *mem, int val)
{
__asm__ __volatile__(
" LA 2,%0\n"
"0: L 0,%1\n"
" LR 1,0\n"
" AR 1,%2\n"
" CS 0,1,0(2)\n"
" JL 0b"
: "=m" (*mem) : "0" (*mem), "d" (val) : "0", "1", "2" );
}
static inline int
__attribute__ ((unused))
compare_and_swap (volatile long int *p, long int oldval, long int newval)
{
int retval;
__asm__ __volatile__(
" la 1,%1\n"
" lr 0,%2\n"
" cs 0,%3,0(1)\n"
" ipm %0\n"
" srl %0,28\n"
"0:"
: "=&r" (retval), "+m" (*p)
: "d" (oldval) , "d" (newval)
: "memory", "0", "1", "cc");
return !retval;
}
#endif /* atomicity.h */
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