2000-08-02 15:15:00 +00:00
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/* Low-level functions for atomic operations. S390 version.
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _ATOMICITY_H
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#define _ATOMICITY_H 1
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#include <inttypes.h>
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static inline int
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__attribute__ ((unused))
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exchange_and_add (volatile uint32_t *mem, int val)
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{
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int result;
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__asm__ __volatile__(
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" L %0,%2\n"
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" LA 2,%1\n"
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"0: LR 0,%0\n"
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" AR 0,%3\n"
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" CS %0,0,0(2)\n"
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" JL 0b"
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: "=&d" (result), "=m" (*mem)
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: "1" (*mem), "d" (val) : "0", "1", "2" );
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return result;
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}
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static inline void
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__attribute__ ((unused))
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atomic_add (volatile uint32_t *mem, int val)
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{
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__asm__ __volatile__(
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" LA 2,%0\n"
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"0: L 0,%1\n"
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" LR 1,0\n"
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" AR 1,%2\n"
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" CS 0,1,0(2)\n"
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" JL 0b"
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: "=m" (*mem) : "0" (*mem), "d" (val) : "0", "1", "2" );
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}
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static inline int
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__attribute__ ((unused))
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compare_and_swap (volatile long int *p, long int oldval, long int newval)
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{
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int retval;
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__asm__ __volatile__(
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2000-09-28 23:32:48 +00:00
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" la 1,%1\n"
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" lr 0,%2\n"
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" cs 0,%3,0(1)\n"
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2000-08-02 15:15:00 +00:00
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" ipm %0\n"
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" srl %0,28\n"
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"0:"
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: "=&r" (retval), "+m" (*p)
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: "d" (oldval) , "d" (newval)
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2000-09-28 23:32:48 +00:00
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: "memory", "0", "1", "cc");
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2000-08-02 15:15:00 +00:00
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return !retval;
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}
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#endif /* atomicity.h */
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