2000-08-02 17:15:00 +02:00
|
|
|
/* Low-level functions for atomic operations. S390 version.
|
|
|
|
|
Copyright (C) 2000 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 Library General Public License as
|
|
|
|
|
published by the Free Software Foundation; either version 2 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
|
|
|
|
|
Library General Public License for more details.
|
|
|
|
|
|
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
|
|
|
License along with the GNU C Library; see the file COPYING.LIB. 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__(
|
2000-09-29 01:32:48 +02:00
|
|
|
" la 1,%1\n"
|
|
|
|
|
" lr 0,%2\n"
|
|
|
|
|
" cs 0,%3,0(1)\n"
|
2000-08-02 17:15:00 +02:00
|
|
|
" ipm %0\n"
|
|
|
|
|
" srl %0,28\n"
|
|
|
|
|
"0:"
|
|
|
|
|
: "=&r" (retval), "+m" (*p)
|
|
|
|
|
: "d" (oldval) , "d" (newval)
|
2000-09-29 01:32:48 +02:00
|
|
|
: "memory", "0", "1", "cc");
|
2000-08-02 17:15:00 +02:00
|
|
|
return !retval;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#endif /* atomicity.h */
|
