| 1 |
1325 |
phoenix |
/* Low-level functions for atomic operations. m680x0 version, x >= 2.
|
| 2 |
|
|
Copyright (C) 1997 Free Software Foundation, Inc.
|
| 3 |
|
|
Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
|
| 4 |
|
|
This file is part of the GNU C Library.
|
| 5 |
|
|
|
| 6 |
|
|
The GNU C Library is free software; you can redistribute it and/or
|
| 7 |
|
|
modify it under the terms of the GNU Lesser General Public
|
| 8 |
|
|
License as published by the Free Software Foundation; either
|
| 9 |
|
|
version 2.1 of the License, or (at your option) any later version.
|
| 10 |
|
|
|
| 11 |
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
| 12 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 13 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 14 |
|
|
Lesser General Public License for more details.
|
| 15 |
|
|
|
| 16 |
|
|
You should have received a copy of the GNU Lesser General Public
|
| 17 |
|
|
License along with the GNU C Library; if not, write to the Free
|
| 18 |
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
| 19 |
|
|
02111-1307 USA. */
|
| 20 |
|
|
|
| 21 |
|
|
#ifndef _ATOMICITY_H
|
| 22 |
|
|
#define _ATOMICITY_H 1
|
| 23 |
|
|
|
| 24 |
|
|
#include <inttypes.h>
|
| 25 |
|
|
|
| 26 |
|
|
|
| 27 |
|
|
static inline int
|
| 28 |
|
|
__attribute__ ((unused))
|
| 29 |
|
|
exchange_and_add (volatile uint32_t *mem, int val)
|
| 30 |
|
|
{
|
| 31 |
|
|
register int result = *mem;
|
| 32 |
|
|
register int temp;
|
| 33 |
|
|
__asm__ __volatile__ ("1: move%.l %0,%1;"
|
| 34 |
|
|
" add%.l %2,%1;"
|
| 35 |
|
|
" cas%.l %0,%1,%3;"
|
| 36 |
|
|
" jbne 1b"
|
| 37 |
|
|
: "=d" (result), "=&d" (temp)
|
| 38 |
|
|
: "d" (val), "m" (*mem), "0" (result) : "memory");
|
| 39 |
|
|
return result;
|
| 40 |
|
|
}
|
| 41 |
|
|
|
| 42 |
|
|
static inline void
|
| 43 |
|
|
__attribute__ ((unused))
|
| 44 |
|
|
atomic_add (volatile uint32_t *mem, int val)
|
| 45 |
|
|
{
|
| 46 |
|
|
/* XXX Use cas here as well? */
|
| 47 |
|
|
__asm__ __volatile__ ("add%.l %0,%1"
|
| 48 |
|
|
: : "id" (val), "m" (*mem) : "memory");
|
| 49 |
|
|
}
|
| 50 |
|
|
|
| 51 |
|
|
static inline int
|
| 52 |
|
|
__attribute__ ((unused))
|
| 53 |
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
| 54 |
|
|
{
|
| 55 |
|
|
char ret;
|
| 56 |
|
|
long int readval;
|
| 57 |
|
|
|
| 58 |
|
|
__asm__ __volatile__ ("cas%.l %2,%3,%1; seq %0"
|
| 59 |
|
|
: "=dm" (ret), "=m" (*p), "=d" (readval)
|
| 60 |
|
|
: "d" (newval), "m" (*p), "2" (oldval));
|
| 61 |
|
|
return ret;
|
| 62 |
|
|
}
|
| 63 |
|
|
|
| 64 |
|
|
#endif /* atomicity.h */
|
