/**************************************************************************** * arch/xtensa/src/common/xtensa_modifyreg8.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "xtensa.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: modifyreg8 * * Description: * Atomically modify the specified bits in a memory mapped register * ****************************************************************************/ void modifyreg8(unsigned int addr, uint8_t clearbits, uint8_t setbits) { irqstate_t flags; uint8_t regval; flags = spin_lock_irqsave(NULL); regval = getreg8(addr); regval &= ~clearbits; regval |= setbits; putreg8(regval, addr); spin_unlock_irqrestore(NULL, flags); }