99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* Low-level functions for atomic operations. Sparc32 version.
|
|
Copyright (C) 1999 Free Software Foundation, Inc.
|
|
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 int
|
|
__attribute__ ((unused))
|
|
exchange_and_add (volatile uint32_t *mem, int val)
|
|
{
|
|
static unsigned char lock;
|
|
int result, tmp;
|
|
|
|
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
|
|
" cmp %0, 0\n\t"
|
|
" bne 1b\n\t"
|
|
" nop"
|
|
: "=&r" (tmp)
|
|
: "r" (&lock)
|
|
: "memory");
|
|
result = *mem;
|
|
*mem += val;
|
|
__asm__ __volatile__("stb %%g0, [%0]"
|
|
: /* no outputs */
|
|
: "r" (&lock)
|
|
: "memory");
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
__attribute__ ((unused))
|
|
atomic_add (volatile uint32_t *mem, int val)
|
|
{
|
|
static unsigned char lock;
|
|
int tmp;
|
|
|
|
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
|
|
" cmp %0, 0\n\t"
|
|
" bne 1b\n\t"
|
|
" nop"
|
|
: "=&r" (tmp)
|
|
: "r" (&lock)
|
|
: "memory");
|
|
*mem += val;
|
|
__asm__ __volatile__("stb %%g0, [%0]"
|
|
: /* no outputs */
|
|
: "r" (&lock)
|
|
: "memory");
|
|
}
|
|
|
|
static int
|
|
__attribute__ ((unused))
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
|
{
|
|
static unsigned char lock;
|
|
int ret, tmp;
|
|
|
|
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
|
|
" cmp %0, 0\n\t"
|
|
" bne 1b\n\t"
|
|
" nop"
|
|
: "=&r" (tmp)
|
|
: "r" (&lock)
|
|
: "memory");
|
|
if (*p != oldval)
|
|
ret = 0;
|
|
else
|
|
{
|
|
*p = newval;
|
|
ret = 1;
|
|
}
|
|
__asm__ __volatile__("stb %%g0, [%0]"
|
|
: /* no outputs */
|
|
: "r" (&lock)
|
|
: "memory");
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* atomicity.h */
|