| /* |
| * Copyright 2019 Google LLC |
| * |
| * Licensed 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 |
| * |
| * https://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. |
| */ |
| |
| #include <cstddef> |
| |
| #include "instr.h" |
| #include "utils.h" |
| |
| constexpr size_t kCacheLineSize = 64; |
| |
| // Flush a memory interval from cache. Used to induce speculative execution on |
| // flushed values until they are fetched back to the cache. |
| void FlushFromCache(const char *start, const char *end) { |
| // Start on the first byte and continue in kCacheLineSize steps. |
| for (const char *ptr = start; ptr < end; ptr += kCacheLineSize) { |
| CLFlush(ptr); |
| } |
| // Flush explicitly the last byte. |
| CLFlush(end - 1); |
| } |