1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef CHRE_PLATFORM_SHARED_CACHE_MANAGEMENT_H_ 18 #define CHRE_PLATFORM_SHARED_CACHE_MANAGEMENT_H_ 19 20 #include <cinttypes> 21 22 namespace chre { 23 24 /** 25 * Invalidates and/or cleans the system instruction and data caches. 26 * 27 * When nanoapps in CHRE are loaded dynamically, the data and 28 * executable segments are parsed and relocated into memory. This operation 29 * can cause cached instructions and data to be invalid when we start executing 30 * the newly loaded nanoapp's instructions, and could possibly lead to an 31 * exception. To support custom dynamic loading implementations (for example, 32 * when it's not part of the underlying OS/system), the platform needs to 33 * implement (or provide an empty stub for) the following method to invalidate 34 * and/or clean the system data and instruction caches. 35 * 36 * If either one of the address or span parameter is zero (0), the function 37 * should wipe the entire system cache if it is supported by the platform. 38 * 39 * @param address The target memory address to invalidate cache. 40 * @param span Span of target memory to invalidate. 41 */ 42 void wipeSystemCaches(uintptr_t address = 0, uint32_t span = 0); 43 44 } // namespace chre 45 46 #endif // CHRE_PLATFORM_SHARED_CACHE_MANAGEMENT_H_ 47