| 0,0 → 1,51 |
|---|
| /* |
| * High-resolution timing routines (PIT reprogramming) |
| * |
| * This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io |
| * Published under the terms of the MIT License, as stated below. |
| * |
| * Copyright (C) 2014-2023 Mateusz Viste |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #ifndef MDR_TIMER_H |
| #define MDR_TIMER_H |
| |
| /* Starts the timer by reprogramming the 8253 chip from its default 18.2 Hz |
| * frequency to about 1.1 kHz. It is mandatory to revert the timer to its |
| * original frequency via mdr_timer_stop() before your application quits. */ |
| void mdr_timer_init(void); |
| |
| /* Fills res with the amount of microseconds that elapsed since either |
| * mdr_timer_init() or mdr_timer_reset(), whichever was called last. |
| * Note that the res counter wraps around approximately every 71 minutes if |
| * mdr_timer_reset() is not called. */ |
| void mdr_timer_read(unsigned long *res); |
| |
| /* Reset the timer value, this can be used by the application to make sure |
| * no timer wrap occurs during critical parts of your code flow */ |
| void mdr_timer_reset(void); |
| |
| /* Stops (uninstalls) the timer. This must be called before your application |
| * quits, otherwise the system will likely crash. This function has a void |
| * return value so that it can be registered as an atexit() procedure. */ |
| void mdr_timer_stop(void); |
| |
| #endif |