/* Low-level functions for atomic operations. Alpha 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 inline int __attribute_used__ exchange_and_add (volatile uint32_t *mem, int val) { register int result, tmp; __asm__ __volatile__ ( "/* Inline exchange & add */\n" "1:\t" "ldl_l %0,%3\n\t" "addl %0,%4,%1\n\t" "stl_c %1,%2\n\t" "beq %1,2f\n" ".subsection 1\n" "2:\t" "br 1b\n" ".previous\n\t" "mb\n\t" "/* End exchange & add */" : "=&r"(result), "=&r"(tmp), "=m"(*mem) : "m" (*mem), "r"(val)); return result; } static inline void __attribute_used__ atomic_add (volatile uint32_t *mem, int val) { register int result; __asm__ __volatile__ ( "/* Inline exchange & add */\n" "1:\t" "ldl_l %0,%2\n\t" "addl %0,%3,%0\n\t" "stl_c %0,%1\n\t" "beq %0,2f\n\t" ".subsection 1\n" "2:\t" "br 1b\n" ".previous\n\t" "mb\n\t" "/* End exchange & add */" : "=&r"(result), "=m"(*mem) : "m" (*mem), "r"(val)); } static inline long __attribute_used__ compare_and_swap (volatile long int *p, long int oldval, long int newval) { long int ret; __asm__ __volatile__ ( "/* Inline compare & swap */\n" "1:\t" "ldq_l %0,%4\n\t" "cmpeq %0,%2,%0\n\t" "beq %0,3f\n\t" "mov %3,%0\n\t" "stq_c %0,%1\n\t" "beq %0,2f\n\t" ".subsection 1\n" "2:\t" "br 1b\n" ".previous\n\t" "3:\t" "mb\n\t" "/* End compare & swap */" : "=&r"(ret), "=m"(*p) : "r"(oldval), "r"(newval), "m"(*p)); return ret; } #endif /* atomicity.h */