/* Low-level functions for atomic operations. Mips version. Copyright (C) 2001, 2002 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 _MIPS_ATOMICITY_H #define _MIPS_ATOMICITY_H 1 #include <inttypes.h> static inline int __attribute_used__ exchange_and_add (volatile uint32_t *mem, int val) { int result, tmp; __asm__ __volatile__ ("/* Inline exchange & add */\n" "1:\n\t" ".set push\n\t" ".set mips2\n\t" "ll %0,%3\n\t" "addu %1,%4,%0\n\t" "sc %1,%2\n\t" ".set pop\n\t" "beqz %1,1b\n\t" "/* End exchange & add */" : "=&r"(result), "=&r"(tmp), "=m"(*mem) : "m" (*mem), "r"(val) : "memory"); return result; } static inline void __attribute_used__ atomic_add (volatile uint32_t *mem, int val) { int result; __asm__ __volatile__ ("/* Inline atomic add */\n" "1:\n\t" ".set push\n\t" ".set mips2\n\t" "ll %0,%2\n\t" "addu %0,%3,%0\n\t" "sc %0,%1\n\t" ".set pop\n\t" "beqz %0,1b\n\t" "/* End atomic add */" : "=&r"(result), "=m"(*mem) : "m" (*mem), "r"(val) : "memory"); } static inline int __attribute_used__ compare_and_swap (volatile long int *p, long int oldval, long int newval) { long int ret, temp; __asm__ __volatile__ ("/* Inline compare & swap */\n" "1:\n\t" ".set push\n\t" ".set mips2\n\t" "ll %1,%5\n\t" "move %0,$0\n\t" "bne %1,%3,2f\n\t" "move %0,%4\n\t" "sc %0,%2\n\t" ".set pop\n\t" "beqz %0,1b\n" "2:\n\t" "/* End compare & swap */" : "=&r" (ret), "=&r" (temp), "=m" (*p) : "r" (oldval), "r" (newval), "m" (*p) : "memory"); return ret; } #endif /* atomicity.h */