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103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/* Low-level functions for atomic operations. Alpha version.
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Copyright (C) 1999 Free Software Foundation, Inc.
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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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register int result, tmp;
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__asm__ __volatile__ (
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"/* Inline exchange & add */\n"
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"1:\t"
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"ldl_l %0,%3\n\t"
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"addl %0,%4,%1\n\t"
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"stl_c %1,%2\n\t"
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"beq %1,2f\n"
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".subsection 1\n"
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"2:\t"
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"br 1b\n"
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".previous\n\t"
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"mb\n\t"
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"/* End exchange & add */"
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: "=&r"(result), "=&r"(tmp), "=m"(*mem)
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: "m" (*mem), "r"(val));
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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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register int result;
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__asm__ __volatile__ (
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"/* Inline exchange & add */\n"
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"1:\t"
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"ldl_l %0,%2\n\t"
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"addl %0,%3,%0\n\t"
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"stl_c %0,%1\n\t"
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"beq %0,2f\n\t"
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".subsection 1\n"
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"2:\t"
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"br 1b\n"
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".previous\n\t"
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"mb\n\t"
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"/* End exchange & add */"
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: "=&r"(result), "=m"(*mem)
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: "m" (*mem), "r"(val));
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}
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static inline long
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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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long int ret;
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__asm__ __volatile__ (
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"/* Inline compare & swap */\n"
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"1:\t"
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"ldq_l %0,%4\n\t"
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"cmpeq %0,%2,%0\n\t"
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"beq %0,3f\n\t"
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"mov %3,%0\n\t"
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"stq_c %0,%1\n\t"
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"beq %0,2f\n\t"
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".subsection 1\n"
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"2:\t"
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"br 1b\n"
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".previous\n\t"
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"3:\t"
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"mb\n\t"
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"/* End compare & swap */"
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: "=&r"(ret), "=m"(*p)
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: "r"(oldval), "r"(newval), "m"(*p));
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return ret;
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}
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#endif /* atomicity.h */
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